1 /* 2 * omap_hwmod implementation for OMAP2/3/4 3 * 4 * Copyright (C) 2009-2011 Nokia Corporation 5 * Copyright (C) 2011-2012 Texas Instruments, Inc. 6 * 7 * Paul Walmsley, Benoît Cousson, Kevin Hilman 8 * 9 * Created in collaboration with (alphabetical order): Thara Gopinath, 10 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand 11 * Sawant, Santosh Shilimkar, Richard Woodruff 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 as 15 * published by the Free Software Foundation. 16 * 17 * Introduction 18 * ------------ 19 * One way to view an OMAP SoC is as a collection of largely unrelated 20 * IP blocks connected by interconnects. The IP blocks include 21 * devices such as ARM processors, audio serial interfaces, UARTs, 22 * etc. Some of these devices, like the DSP, are created by TI; 23 * others, like the SGX, largely originate from external vendors. In 24 * TI's documentation, on-chip devices are referred to as "OMAP 25 * modules." Some of these IP blocks are identical across several 26 * OMAP versions. Others are revised frequently. 27 * 28 * These OMAP modules are tied together by various interconnects. 29 * Most of the address and data flow between modules is via OCP-based 30 * interconnects such as the L3 and L4 buses; but there are other 31 * interconnects that distribute the hardware clock tree, handle idle 32 * and reset signaling, supply power, and connect the modules to 33 * various pads or balls on the OMAP package. 34 * 35 * OMAP hwmod provides a consistent way to describe the on-chip 36 * hardware blocks and their integration into the rest of the chip. 37 * This description can be automatically generated from the TI 38 * hardware database. OMAP hwmod provides a standard, consistent API 39 * to reset, enable, idle, and disable these hardware blocks. And 40 * hwmod provides a way for other core code, such as the Linux device 41 * code or the OMAP power management and address space mapping code, 42 * to query the hardware database. 43 * 44 * Using hwmod 45 * ----------- 46 * Drivers won't call hwmod functions directly. That is done by the 47 * omap_device code, and in rare occasions, by custom integration code 48 * in arch/arm/ *omap*. The omap_device code includes functions to 49 * build a struct platform_device using omap_hwmod data, and that is 50 * currently how hwmod data is communicated to drivers and to the 51 * Linux driver model. Most drivers will call omap_hwmod functions only 52 * indirectly, via pm_runtime*() functions. 53 * 54 * From a layering perspective, here is where the OMAP hwmod code 55 * fits into the kernel software stack: 56 * 57 * +-------------------------------+ 58 * | Device driver code | 59 * | (e.g., drivers/) | 60 * +-------------------------------+ 61 * | Linux driver model | 62 * | (platform_device / | 63 * | platform_driver data/code) | 64 * +-------------------------------+ 65 * | OMAP core-driver integration | 66 * |(arch/arm/mach-omap2/devices.c)| 67 * +-------------------------------+ 68 * | omap_device code | 69 * | (../plat-omap/omap_device.c) | 70 * +-------------------------------+ 71 * ----> | omap_hwmod code/data | <----- 72 * | (../mach-omap2/omap_hwmod*) | 73 * +-------------------------------+ 74 * | OMAP clock/PRCM/register fns | 75 * | ({read,write}l_relaxed, clk*) | 76 * +-------------------------------+ 77 * 78 * Device drivers should not contain any OMAP-specific code or data in 79 * them. They should only contain code to operate the IP block that 80 * the driver is responsible for. This is because these IP blocks can 81 * also appear in other SoCs, either from TI (such as DaVinci) or from 82 * other manufacturers; and drivers should be reusable across other 83 * platforms. 84 * 85 * The OMAP hwmod code also will attempt to reset and idle all on-chip 86 * devices upon boot. The goal here is for the kernel to be 87 * completely self-reliant and independent from bootloaders. This is 88 * to ensure a repeatable configuration, both to ensure consistent 89 * runtime behavior, and to make it easier for others to reproduce 90 * bugs. 91 * 92 * OMAP module activity states 93 * --------------------------- 94 * The hwmod code considers modules to be in one of several activity 95 * states. IP blocks start out in an UNKNOWN state, then once they 96 * are registered via the hwmod code, proceed to the REGISTERED state. 97 * Once their clock names are resolved to clock pointers, the module 98 * enters the CLKS_INITED state; and finally, once the module has been 99 * reset and the integration registers programmed, the INITIALIZED state 100 * is entered. The hwmod code will then place the module into either 101 * the IDLE state to save power, or in the case of a critical system 102 * module, the ENABLED state. 103 * 104 * OMAP core integration code can then call omap_hwmod*() functions 105 * directly to move the module between the IDLE, ENABLED, and DISABLED 106 * states, as needed. This is done during both the PM idle loop, and 107 * in the OMAP core integration code's implementation of the PM runtime 108 * functions. 109 * 110 * References 111 * ---------- 112 * This is a partial list. 113 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064) 114 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090) 115 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108) 116 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140) 117 * - Open Core Protocol Specification 2.2 118 * 119 * To do: 120 * - handle IO mapping 121 * - bus throughput & module latency measurement code 122 * 123 * XXX add tests at the beginning of each function to ensure the hwmod is 124 * in the appropriate state 125 * XXX error return values should be checked to ensure that they are 126 * appropriate 127 */ 128 #undef DEBUG 129 130 #include <linux/kernel.h> 131 #include <linux/errno.h> 132 #include <linux/io.h> 133 #include <linux/clk-provider.h> 134 #include <linux/delay.h> 135 #include <linux/err.h> 136 #include <linux/list.h> 137 #include <linux/mutex.h> 138 #include <linux/spinlock.h> 139 #include <linux/slab.h> 140 #include <linux/bootmem.h> 141 #include <linux/cpu.h> 142 #include <linux/of.h> 143 #include <linux/of_address.h> 144 145 #include <asm/system_misc.h> 146 147 #include "clock.h" 148 #include "omap_hwmod.h" 149 150 #include "soc.h" 151 #include "common.h" 152 #include "clockdomain.h" 153 #include "powerdomain.h" 154 #include "cm2xxx.h" 155 #include "cm3xxx.h" 156 #include "cminst44xx.h" 157 #include "cm33xx.h" 158 #include "prm.h" 159 #include "prm3xxx.h" 160 #include "prm44xx.h" 161 #include "prm33xx.h" 162 #include "prminst44xx.h" 163 #include "mux.h" 164 #include "pm.h" 165 166 /* Name of the OMAP hwmod for the MPU */ 167 #define MPU_INITIATOR_NAME "mpu" 168 169 /* 170 * Number of struct omap_hwmod_link records per struct 171 * omap_hwmod_ocp_if record (master->slave and slave->master) 172 */ 173 #define LINKS_PER_OCP_IF 2 174 175 /** 176 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations 177 * @enable_module: function to enable a module (via MODULEMODE) 178 * @disable_module: function to disable a module (via MODULEMODE) 179 * 180 * XXX Eventually this functionality will be hidden inside the PRM/CM 181 * device drivers. Until then, this should avoid huge blocks of cpu_is_*() 182 * conditionals in this code. 183 */ 184 struct omap_hwmod_soc_ops { 185 void (*enable_module)(struct omap_hwmod *oh); 186 int (*disable_module)(struct omap_hwmod *oh); 187 int (*wait_target_ready)(struct omap_hwmod *oh); 188 int (*assert_hardreset)(struct omap_hwmod *oh, 189 struct omap_hwmod_rst_info *ohri); 190 int (*deassert_hardreset)(struct omap_hwmod *oh, 191 struct omap_hwmod_rst_info *ohri); 192 int (*is_hardreset_asserted)(struct omap_hwmod *oh, 193 struct omap_hwmod_rst_info *ohri); 194 int (*init_clkdm)(struct omap_hwmod *oh); 195 void (*update_context_lost)(struct omap_hwmod *oh); 196 int (*get_context_lost)(struct omap_hwmod *oh); 197 }; 198 199 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */ 200 static struct omap_hwmod_soc_ops soc_ops; 201 202 /* omap_hwmod_list contains all registered struct omap_hwmods */ 203 static LIST_HEAD(omap_hwmod_list); 204 205 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */ 206 static struct omap_hwmod *mpu_oh; 207 208 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */ 209 static DEFINE_SPINLOCK(io_chain_lock); 210 211 /* 212 * linkspace: ptr to a buffer that struct omap_hwmod_link records are 213 * allocated from - used to reduce the number of small memory 214 * allocations, which has a significant impact on performance 215 */ 216 static struct omap_hwmod_link *linkspace; 217 218 /* 219 * free_ls, max_ls: array indexes into linkspace; representing the 220 * next free struct omap_hwmod_link index, and the maximum number of 221 * struct omap_hwmod_link records allocated (respectively) 222 */ 223 static unsigned short free_ls, max_ls, ls_supp; 224 225 /* inited: set to true once the hwmod code is initialized */ 226 static bool inited; 227 228 /* Private functions */ 229 230 /** 231 * _fetch_next_ocp_if - return the next OCP interface in a list 232 * @p: ptr to a ptr to the list_head inside the ocp_if to return 233 * @i: pointer to the index of the element pointed to by @p in the list 234 * 235 * Return a pointer to the struct omap_hwmod_ocp_if record 236 * containing the struct list_head pointed to by @p, and increment 237 * @p such that a future call to this routine will return the next 238 * record. 239 */ 240 static struct omap_hwmod_ocp_if *_fetch_next_ocp_if(struct list_head **p, 241 int *i) 242 { 243 struct omap_hwmod_ocp_if *oi; 244 245 oi = list_entry(*p, struct omap_hwmod_link, node)->ocp_if; 246 *p = (*p)->next; 247 248 *i = *i + 1; 249 250 return oi; 251 } 252 253 /** 254 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy 255 * @oh: struct omap_hwmod * 256 * 257 * Load the current value of the hwmod OCP_SYSCONFIG register into the 258 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no 259 * OCP_SYSCONFIG register or 0 upon success. 260 */ 261 static int _update_sysc_cache(struct omap_hwmod *oh) 262 { 263 if (!oh->class->sysc) { 264 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name); 265 return -EINVAL; 266 } 267 268 /* XXX ensure module interface clock is up */ 269 270 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs); 271 272 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE)) 273 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED; 274 275 return 0; 276 } 277 278 /** 279 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register 280 * @v: OCP_SYSCONFIG value to write 281 * @oh: struct omap_hwmod * 282 * 283 * Write @v into the module class' OCP_SYSCONFIG register, if it has 284 * one. No return value. 285 */ 286 static void _write_sysconfig(u32 v, struct omap_hwmod *oh) 287 { 288 if (!oh->class->sysc) { 289 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name); 290 return; 291 } 292 293 /* XXX ensure module interface clock is up */ 294 295 /* Module might have lost context, always update cache and register */ 296 oh->_sysc_cache = v; 297 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs); 298 } 299 300 /** 301 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v 302 * @oh: struct omap_hwmod * 303 * @standbymode: MIDLEMODE field bits 304 * @v: pointer to register contents to modify 305 * 306 * Update the master standby mode bits in @v to be @standbymode for 307 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL 308 * upon error or 0 upon success. 309 */ 310 static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode, 311 u32 *v) 312 { 313 u32 mstandby_mask; 314 u8 mstandby_shift; 315 316 if (!oh->class->sysc || 317 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE)) 318 return -EINVAL; 319 320 if (!oh->class->sysc->sysc_fields) { 321 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); 322 return -EINVAL; 323 } 324 325 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift; 326 mstandby_mask = (0x3 << mstandby_shift); 327 328 *v &= ~mstandby_mask; 329 *v |= __ffs(standbymode) << mstandby_shift; 330 331 return 0; 332 } 333 334 /** 335 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v 336 * @oh: struct omap_hwmod * 337 * @idlemode: SIDLEMODE field bits 338 * @v: pointer to register contents to modify 339 * 340 * Update the slave idle mode bits in @v to be @idlemode for the @oh 341 * hwmod. Does not write to the hardware. Returns -EINVAL upon error 342 * or 0 upon success. 343 */ 344 static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v) 345 { 346 u32 sidle_mask; 347 u8 sidle_shift; 348 349 if (!oh->class->sysc || 350 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE)) 351 return -EINVAL; 352 353 if (!oh->class->sysc->sysc_fields) { 354 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); 355 return -EINVAL; 356 } 357 358 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift; 359 sidle_mask = (0x3 << sidle_shift); 360 361 *v &= ~sidle_mask; 362 *v |= __ffs(idlemode) << sidle_shift; 363 364 return 0; 365 } 366 367 /** 368 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v 369 * @oh: struct omap_hwmod * 370 * @clockact: CLOCKACTIVITY field bits 371 * @v: pointer to register contents to modify 372 * 373 * Update the clockactivity mode bits in @v to be @clockact for the 374 * @oh hwmod. Used for additional powersaving on some modules. Does 375 * not write to the hardware. Returns -EINVAL upon error or 0 upon 376 * success. 377 */ 378 static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v) 379 { 380 u32 clkact_mask; 381 u8 clkact_shift; 382 383 if (!oh->class->sysc || 384 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY)) 385 return -EINVAL; 386 387 if (!oh->class->sysc->sysc_fields) { 388 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); 389 return -EINVAL; 390 } 391 392 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift; 393 clkact_mask = (0x3 << clkact_shift); 394 395 *v &= ~clkact_mask; 396 *v |= clockact << clkact_shift; 397 398 return 0; 399 } 400 401 /** 402 * _set_softreset: set OCP_SYSCONFIG.SOFTRESET bit in @v 403 * @oh: struct omap_hwmod * 404 * @v: pointer to register contents to modify 405 * 406 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon 407 * error or 0 upon success. 408 */ 409 static int _set_softreset(struct omap_hwmod *oh, u32 *v) 410 { 411 u32 softrst_mask; 412 413 if (!oh->class->sysc || 414 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET)) 415 return -EINVAL; 416 417 if (!oh->class->sysc->sysc_fields) { 418 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); 419 return -EINVAL; 420 } 421 422 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift); 423 424 *v |= softrst_mask; 425 426 return 0; 427 } 428 429 /** 430 * _clear_softreset: clear OCP_SYSCONFIG.SOFTRESET bit in @v 431 * @oh: struct omap_hwmod * 432 * @v: pointer to register contents to modify 433 * 434 * Clear the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon 435 * error or 0 upon success. 436 */ 437 static int _clear_softreset(struct omap_hwmod *oh, u32 *v) 438 { 439 u32 softrst_mask; 440 441 if (!oh->class->sysc || 442 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET)) 443 return -EINVAL; 444 445 if (!oh->class->sysc->sysc_fields) { 446 WARN(1, 447 "omap_hwmod: %s: sysc_fields absent for sysconfig class\n", 448 oh->name); 449 return -EINVAL; 450 } 451 452 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift); 453 454 *v &= ~softrst_mask; 455 456 return 0; 457 } 458 459 /** 460 * _wait_softreset_complete - wait for an OCP softreset to complete 461 * @oh: struct omap_hwmod * to wait on 462 * 463 * Wait until the IP block represented by @oh reports that its OCP 464 * softreset is complete. This can be triggered by software (see 465 * _ocp_softreset()) or by hardware upon returning from off-mode (one 466 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT 467 * microseconds. Returns the number of microseconds waited. 468 */ 469 static int _wait_softreset_complete(struct omap_hwmod *oh) 470 { 471 struct omap_hwmod_class_sysconfig *sysc; 472 u32 softrst_mask; 473 int c = 0; 474 475 sysc = oh->class->sysc; 476 477 if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS) 478 omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs) 479 & SYSS_RESETDONE_MASK), 480 MAX_MODULE_SOFTRESET_WAIT, c); 481 else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) { 482 softrst_mask = (0x1 << sysc->sysc_fields->srst_shift); 483 omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs) 484 & softrst_mask), 485 MAX_MODULE_SOFTRESET_WAIT, c); 486 } 487 488 return c; 489 } 490 491 /** 492 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v 493 * @oh: struct omap_hwmod * 494 * 495 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register 496 * of some modules. When the DMA must perform read/write accesses, the 497 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop 498 * for power management, software must set the DMADISABLE bit back to 1. 499 * 500 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon 501 * error or 0 upon success. 502 */ 503 static int _set_dmadisable(struct omap_hwmod *oh) 504 { 505 u32 v; 506 u32 dmadisable_mask; 507 508 if (!oh->class->sysc || 509 !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE)) 510 return -EINVAL; 511 512 if (!oh->class->sysc->sysc_fields) { 513 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); 514 return -EINVAL; 515 } 516 517 /* clocks must be on for this operation */ 518 if (oh->_state != _HWMOD_STATE_ENABLED) { 519 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name); 520 return -EINVAL; 521 } 522 523 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name); 524 525 v = oh->_sysc_cache; 526 dmadisable_mask = 527 (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift); 528 v |= dmadisable_mask; 529 _write_sysconfig(v, oh); 530 531 return 0; 532 } 533 534 /** 535 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v 536 * @oh: struct omap_hwmod * 537 * @autoidle: desired AUTOIDLE bitfield value (0 or 1) 538 * @v: pointer to register contents to modify 539 * 540 * Update the module autoidle bit in @v to be @autoidle for the @oh 541 * hwmod. The autoidle bit controls whether the module can gate 542 * internal clocks automatically when it isn't doing anything; the 543 * exact function of this bit varies on a per-module basis. This 544 * function does not write to the hardware. Returns -EINVAL upon 545 * error or 0 upon success. 546 */ 547 static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle, 548 u32 *v) 549 { 550 u32 autoidle_mask; 551 u8 autoidle_shift; 552 553 if (!oh->class->sysc || 554 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE)) 555 return -EINVAL; 556 557 if (!oh->class->sysc->sysc_fields) { 558 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); 559 return -EINVAL; 560 } 561 562 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift; 563 autoidle_mask = (0x1 << autoidle_shift); 564 565 *v &= ~autoidle_mask; 566 *v |= autoidle << autoidle_shift; 567 568 return 0; 569 } 570 571 /** 572 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux 573 * @oh: struct omap_hwmod * 574 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable 575 * 576 * Set or clear the I/O pad wakeup flag in the mux entries for the 577 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array 578 * in memory. If the hwmod is currently idled, and the new idle 579 * values don't match the previous ones, this function will also 580 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not 581 * currently idled, this function won't touch the hardware: the new 582 * mux settings are written to the SCM PADCTRL registers when the 583 * hwmod is idled. No return value. 584 */ 585 static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake) 586 { 587 struct omap_device_pad *pad; 588 bool change = false; 589 u16 prev_idle; 590 int j; 591 592 if (!oh->mux || !oh->mux->enabled) 593 return; 594 595 for (j = 0; j < oh->mux->nr_pads_dynamic; j++) { 596 pad = oh->mux->pads_dynamic[j]; 597 598 if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP)) 599 continue; 600 601 prev_idle = pad->idle; 602 603 if (set_wake) 604 pad->idle |= OMAP_WAKEUP_EN; 605 else 606 pad->idle &= ~OMAP_WAKEUP_EN; 607 608 if (prev_idle != pad->idle) 609 change = true; 610 } 611 612 if (change && oh->_state == _HWMOD_STATE_IDLE) 613 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE); 614 } 615 616 /** 617 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware 618 * @oh: struct omap_hwmod * 619 * 620 * Allow the hardware module @oh to send wakeups. Returns -EINVAL 621 * upon error or 0 upon success. 622 */ 623 static int _enable_wakeup(struct omap_hwmod *oh, u32 *v) 624 { 625 if (!oh->class->sysc || 626 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) || 627 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) || 628 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP))) 629 return -EINVAL; 630 631 if (!oh->class->sysc->sysc_fields) { 632 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); 633 return -EINVAL; 634 } 635 636 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) 637 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift; 638 639 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) 640 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v); 641 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) 642 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v); 643 644 /* XXX test pwrdm_get_wken for this hwmod's subsystem */ 645 646 return 0; 647 } 648 649 /** 650 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware 651 * @oh: struct omap_hwmod * 652 * 653 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL 654 * upon error or 0 upon success. 655 */ 656 static int _disable_wakeup(struct omap_hwmod *oh, u32 *v) 657 { 658 if (!oh->class->sysc || 659 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) || 660 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) || 661 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP))) 662 return -EINVAL; 663 664 if (!oh->class->sysc->sysc_fields) { 665 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); 666 return -EINVAL; 667 } 668 669 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) 670 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift); 671 672 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) 673 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v); 674 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) 675 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART, v); 676 677 /* XXX test pwrdm_get_wken for this hwmod's subsystem */ 678 679 return 0; 680 } 681 682 static struct clockdomain *_get_clkdm(struct omap_hwmod *oh) 683 { 684 struct clk_hw_omap *clk; 685 686 if (oh->clkdm) { 687 return oh->clkdm; 688 } else if (oh->_clk) { 689 if (__clk_get_flags(oh->_clk) & CLK_IS_BASIC) 690 return NULL; 691 clk = to_clk_hw_omap(__clk_get_hw(oh->_clk)); 692 return clk->clkdm; 693 } 694 return NULL; 695 } 696 697 /** 698 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active 699 * @oh: struct omap_hwmod * 700 * 701 * Prevent the hardware module @oh from entering idle while the 702 * hardare module initiator @init_oh is active. Useful when a module 703 * will be accessed by a particular initiator (e.g., if a module will 704 * be accessed by the IVA, there should be a sleepdep between the IVA 705 * initiator and the module). Only applies to modules in smart-idle 706 * mode. If the clockdomain is marked as not needing autodeps, return 707 * 0 without doing anything. Otherwise, returns -EINVAL upon error or 708 * passes along clkdm_add_sleepdep() value upon success. 709 */ 710 static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh) 711 { 712 struct clockdomain *clkdm, *init_clkdm; 713 714 clkdm = _get_clkdm(oh); 715 init_clkdm = _get_clkdm(init_oh); 716 717 if (!clkdm || !init_clkdm) 718 return -EINVAL; 719 720 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS) 721 return 0; 722 723 return clkdm_add_sleepdep(clkdm, init_clkdm); 724 } 725 726 /** 727 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active 728 * @oh: struct omap_hwmod * 729 * 730 * Allow the hardware module @oh to enter idle while the hardare 731 * module initiator @init_oh is active. Useful when a module will not 732 * be accessed by a particular initiator (e.g., if a module will not 733 * be accessed by the IVA, there should be no sleepdep between the IVA 734 * initiator and the module). Only applies to modules in smart-idle 735 * mode. If the clockdomain is marked as not needing autodeps, return 736 * 0 without doing anything. Returns -EINVAL upon error or passes 737 * along clkdm_del_sleepdep() value upon success. 738 */ 739 static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh) 740 { 741 struct clockdomain *clkdm, *init_clkdm; 742 743 clkdm = _get_clkdm(oh); 744 init_clkdm = _get_clkdm(init_oh); 745 746 if (!clkdm || !init_clkdm) 747 return -EINVAL; 748 749 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS) 750 return 0; 751 752 return clkdm_del_sleepdep(clkdm, init_clkdm); 753 } 754 755 /** 756 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk 757 * @oh: struct omap_hwmod * 758 * 759 * Called from _init_clocks(). Populates the @oh _clk (main 760 * functional clock pointer) if a main_clk is present. Returns 0 on 761 * success or -EINVAL on error. 762 */ 763 static int _init_main_clk(struct omap_hwmod *oh) 764 { 765 int ret = 0; 766 767 if (!oh->main_clk) 768 return 0; 769 770 oh->_clk = clk_get(NULL, oh->main_clk); 771 if (IS_ERR(oh->_clk)) { 772 pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n", 773 oh->name, oh->main_clk); 774 return -EINVAL; 775 } 776 /* 777 * HACK: This needs a re-visit once clk_prepare() is implemented 778 * to do something meaningful. Today its just a no-op. 779 * If clk_prepare() is used at some point to do things like 780 * voltage scaling etc, then this would have to be moved to 781 * some point where subsystems like i2c and pmic become 782 * available. 783 */ 784 clk_prepare(oh->_clk); 785 786 if (!_get_clkdm(oh)) 787 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n", 788 oh->name, oh->main_clk); 789 790 return ret; 791 } 792 793 /** 794 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks 795 * @oh: struct omap_hwmod * 796 * 797 * Called from _init_clocks(). Populates the @oh OCP slave interface 798 * clock pointers. Returns 0 on success or -EINVAL on error. 799 */ 800 static int _init_interface_clks(struct omap_hwmod *oh) 801 { 802 struct omap_hwmod_ocp_if *os; 803 struct list_head *p; 804 struct clk *c; 805 int i = 0; 806 int ret = 0; 807 808 p = oh->slave_ports.next; 809 810 while (i < oh->slaves_cnt) { 811 os = _fetch_next_ocp_if(&p, &i); 812 if (!os->clk) 813 continue; 814 815 c = clk_get(NULL, os->clk); 816 if (IS_ERR(c)) { 817 pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n", 818 oh->name, os->clk); 819 ret = -EINVAL; 820 continue; 821 } 822 os->_clk = c; 823 /* 824 * HACK: This needs a re-visit once clk_prepare() is implemented 825 * to do something meaningful. Today its just a no-op. 826 * If clk_prepare() is used at some point to do things like 827 * voltage scaling etc, then this would have to be moved to 828 * some point where subsystems like i2c and pmic become 829 * available. 830 */ 831 clk_prepare(os->_clk); 832 } 833 834 return ret; 835 } 836 837 /** 838 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks 839 * @oh: struct omap_hwmod * 840 * 841 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk 842 * clock pointers. Returns 0 on success or -EINVAL on error. 843 */ 844 static int _init_opt_clks(struct omap_hwmod *oh) 845 { 846 struct omap_hwmod_opt_clk *oc; 847 struct clk *c; 848 int i; 849 int ret = 0; 850 851 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) { 852 c = clk_get(NULL, oc->clk); 853 if (IS_ERR(c)) { 854 pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n", 855 oh->name, oc->clk); 856 ret = -EINVAL; 857 continue; 858 } 859 oc->_clk = c; 860 /* 861 * HACK: This needs a re-visit once clk_prepare() is implemented 862 * to do something meaningful. Today its just a no-op. 863 * If clk_prepare() is used at some point to do things like 864 * voltage scaling etc, then this would have to be moved to 865 * some point where subsystems like i2c and pmic become 866 * available. 867 */ 868 clk_prepare(oc->_clk); 869 } 870 871 return ret; 872 } 873 874 /** 875 * _enable_clocks - enable hwmod main clock and interface clocks 876 * @oh: struct omap_hwmod * 877 * 878 * Enables all clocks necessary for register reads and writes to succeed 879 * on the hwmod @oh. Returns 0. 880 */ 881 static int _enable_clocks(struct omap_hwmod *oh) 882 { 883 struct omap_hwmod_ocp_if *os; 884 struct list_head *p; 885 int i = 0; 886 887 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name); 888 889 if (oh->_clk) 890 clk_enable(oh->_clk); 891 892 p = oh->slave_ports.next; 893 894 while (i < oh->slaves_cnt) { 895 os = _fetch_next_ocp_if(&p, &i); 896 897 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) 898 clk_enable(os->_clk); 899 } 900 901 /* The opt clocks are controlled by the device driver. */ 902 903 return 0; 904 } 905 906 /** 907 * _disable_clocks - disable hwmod main clock and interface clocks 908 * @oh: struct omap_hwmod * 909 * 910 * Disables the hwmod @oh main functional and interface clocks. Returns 0. 911 */ 912 static int _disable_clocks(struct omap_hwmod *oh) 913 { 914 struct omap_hwmod_ocp_if *os; 915 struct list_head *p; 916 int i = 0; 917 918 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name); 919 920 if (oh->_clk) 921 clk_disable(oh->_clk); 922 923 p = oh->slave_ports.next; 924 925 while (i < oh->slaves_cnt) { 926 os = _fetch_next_ocp_if(&p, &i); 927 928 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) 929 clk_disable(os->_clk); 930 } 931 932 /* The opt clocks are controlled by the device driver. */ 933 934 return 0; 935 } 936 937 static void _enable_optional_clocks(struct omap_hwmod *oh) 938 { 939 struct omap_hwmod_opt_clk *oc; 940 int i; 941 942 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name); 943 944 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) 945 if (oc->_clk) { 946 pr_debug("omap_hwmod: enable %s:%s\n", oc->role, 947 __clk_get_name(oc->_clk)); 948 clk_enable(oc->_clk); 949 } 950 } 951 952 static void _disable_optional_clocks(struct omap_hwmod *oh) 953 { 954 struct omap_hwmod_opt_clk *oc; 955 int i; 956 957 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name); 958 959 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) 960 if (oc->_clk) { 961 pr_debug("omap_hwmod: disable %s:%s\n", oc->role, 962 __clk_get_name(oc->_clk)); 963 clk_disable(oc->_clk); 964 } 965 } 966 967 /** 968 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4 969 * @oh: struct omap_hwmod * 970 * 971 * Enables the PRCM module mode related to the hwmod @oh. 972 * No return value. 973 */ 974 static void _omap4_enable_module(struct omap_hwmod *oh) 975 { 976 if (!oh->clkdm || !oh->prcm.omap4.modulemode) 977 return; 978 979 pr_debug("omap_hwmod: %s: %s: %d\n", 980 oh->name, __func__, oh->prcm.omap4.modulemode); 981 982 omap4_cminst_module_enable(oh->prcm.omap4.modulemode, 983 oh->clkdm->prcm_partition, 984 oh->clkdm->cm_inst, 985 oh->clkdm->clkdm_offs, 986 oh->prcm.omap4.clkctrl_offs); 987 } 988 989 /** 990 * _am33xx_enable_module - enable CLKCTRL modulemode on AM33XX 991 * @oh: struct omap_hwmod * 992 * 993 * Enables the PRCM module mode related to the hwmod @oh. 994 * No return value. 995 */ 996 static void _am33xx_enable_module(struct omap_hwmod *oh) 997 { 998 if (!oh->clkdm || !oh->prcm.omap4.modulemode) 999 return; 1000 1001 pr_debug("omap_hwmod: %s: %s: %d\n", 1002 oh->name, __func__, oh->prcm.omap4.modulemode); 1003 1004 am33xx_cm_module_enable(oh->prcm.omap4.modulemode, oh->clkdm->cm_inst, 1005 oh->clkdm->clkdm_offs, 1006 oh->prcm.omap4.clkctrl_offs); 1007 } 1008 1009 /** 1010 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4 1011 * @oh: struct omap_hwmod * 1012 * 1013 * Wait for a module @oh to enter slave idle. Returns 0 if the module 1014 * does not have an IDLEST bit or if the module successfully enters 1015 * slave idle; otherwise, pass along the return value of the 1016 * appropriate *_cm*_wait_module_idle() function. 1017 */ 1018 static int _omap4_wait_target_disable(struct omap_hwmod *oh) 1019 { 1020 if (!oh) 1021 return -EINVAL; 1022 1023 if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm) 1024 return 0; 1025 1026 if (oh->flags & HWMOD_NO_IDLEST) 1027 return 0; 1028 1029 return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition, 1030 oh->clkdm->cm_inst, 1031 oh->clkdm->clkdm_offs, 1032 oh->prcm.omap4.clkctrl_offs); 1033 } 1034 1035 /** 1036 * _am33xx_wait_target_disable - wait for a module to be disabled on AM33XX 1037 * @oh: struct omap_hwmod * 1038 * 1039 * Wait for a module @oh to enter slave idle. Returns 0 if the module 1040 * does not have an IDLEST bit or if the module successfully enters 1041 * slave idle; otherwise, pass along the return value of the 1042 * appropriate *_cm*_wait_module_idle() function. 1043 */ 1044 static int _am33xx_wait_target_disable(struct omap_hwmod *oh) 1045 { 1046 if (!oh) 1047 return -EINVAL; 1048 1049 if (oh->_int_flags & _HWMOD_NO_MPU_PORT) 1050 return 0; 1051 1052 if (oh->flags & HWMOD_NO_IDLEST) 1053 return 0; 1054 1055 return am33xx_cm_wait_module_idle(oh->clkdm->cm_inst, 1056 oh->clkdm->clkdm_offs, 1057 oh->prcm.omap4.clkctrl_offs); 1058 } 1059 1060 /** 1061 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh 1062 * @oh: struct omap_hwmod *oh 1063 * 1064 * Count and return the number of MPU IRQs associated with the hwmod 1065 * @oh. Used to allocate struct resource data. Returns 0 if @oh is 1066 * NULL. 1067 */ 1068 static int _count_mpu_irqs(struct omap_hwmod *oh) 1069 { 1070 struct omap_hwmod_irq_info *ohii; 1071 int i = 0; 1072 1073 if (!oh || !oh->mpu_irqs) 1074 return 0; 1075 1076 do { 1077 ohii = &oh->mpu_irqs[i++]; 1078 } while (ohii->irq != -1); 1079 1080 return i-1; 1081 } 1082 1083 /** 1084 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh 1085 * @oh: struct omap_hwmod *oh 1086 * 1087 * Count and return the number of SDMA request lines associated with 1088 * the hwmod @oh. Used to allocate struct resource data. Returns 0 1089 * if @oh is NULL. 1090 */ 1091 static int _count_sdma_reqs(struct omap_hwmod *oh) 1092 { 1093 struct omap_hwmod_dma_info *ohdi; 1094 int i = 0; 1095 1096 if (!oh || !oh->sdma_reqs) 1097 return 0; 1098 1099 do { 1100 ohdi = &oh->sdma_reqs[i++]; 1101 } while (ohdi->dma_req != -1); 1102 1103 return i-1; 1104 } 1105 1106 /** 1107 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh 1108 * @oh: struct omap_hwmod *oh 1109 * 1110 * Count and return the number of address space ranges associated with 1111 * the hwmod @oh. Used to allocate struct resource data. Returns 0 1112 * if @oh is NULL. 1113 */ 1114 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os) 1115 { 1116 struct omap_hwmod_addr_space *mem; 1117 int i = 0; 1118 1119 if (!os || !os->addr) 1120 return 0; 1121 1122 do { 1123 mem = &os->addr[i++]; 1124 } while (mem->pa_start != mem->pa_end); 1125 1126 return i-1; 1127 } 1128 1129 /** 1130 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name 1131 * @oh: struct omap_hwmod * to operate on 1132 * @name: pointer to the name of the MPU interrupt number to fetch (optional) 1133 * @irq: pointer to an unsigned int to store the MPU IRQ number to 1134 * 1135 * Retrieve a MPU hardware IRQ line number named by @name associated 1136 * with the IP block pointed to by @oh. The IRQ number will be filled 1137 * into the address pointed to by @dma. When @name is non-null, the 1138 * IRQ line number associated with the named entry will be returned. 1139 * If @name is null, the first matching entry will be returned. Data 1140 * order is not meaningful in hwmod data, so callers are strongly 1141 * encouraged to use a non-null @name whenever possible to avoid 1142 * unpredictable effects if hwmod data is later added that causes data 1143 * ordering to change. Returns 0 upon success or a negative error 1144 * code upon error. 1145 */ 1146 static int _get_mpu_irq_by_name(struct omap_hwmod *oh, const char *name, 1147 unsigned int *irq) 1148 { 1149 int i; 1150 bool found = false; 1151 1152 if (!oh->mpu_irqs) 1153 return -ENOENT; 1154 1155 i = 0; 1156 while (oh->mpu_irqs[i].irq != -1) { 1157 if (name == oh->mpu_irqs[i].name || 1158 !strcmp(name, oh->mpu_irqs[i].name)) { 1159 found = true; 1160 break; 1161 } 1162 i++; 1163 } 1164 1165 if (!found) 1166 return -ENOENT; 1167 1168 *irq = oh->mpu_irqs[i].irq; 1169 1170 return 0; 1171 } 1172 1173 /** 1174 * _get_sdma_req_by_name - fetch SDMA request line ID by name 1175 * @oh: struct omap_hwmod * to operate on 1176 * @name: pointer to the name of the SDMA request line to fetch (optional) 1177 * @dma: pointer to an unsigned int to store the request line ID to 1178 * 1179 * Retrieve an SDMA request line ID named by @name on the IP block 1180 * pointed to by @oh. The ID will be filled into the address pointed 1181 * to by @dma. When @name is non-null, the request line ID associated 1182 * with the named entry will be returned. If @name is null, the first 1183 * matching entry will be returned. Data order is not meaningful in 1184 * hwmod data, so callers are strongly encouraged to use a non-null 1185 * @name whenever possible to avoid unpredictable effects if hwmod 1186 * data is later added that causes data ordering to change. Returns 0 1187 * upon success or a negative error code upon error. 1188 */ 1189 static int _get_sdma_req_by_name(struct omap_hwmod *oh, const char *name, 1190 unsigned int *dma) 1191 { 1192 int i; 1193 bool found = false; 1194 1195 if (!oh->sdma_reqs) 1196 return -ENOENT; 1197 1198 i = 0; 1199 while (oh->sdma_reqs[i].dma_req != -1) { 1200 if (name == oh->sdma_reqs[i].name || 1201 !strcmp(name, oh->sdma_reqs[i].name)) { 1202 found = true; 1203 break; 1204 } 1205 i++; 1206 } 1207 1208 if (!found) 1209 return -ENOENT; 1210 1211 *dma = oh->sdma_reqs[i].dma_req; 1212 1213 return 0; 1214 } 1215 1216 /** 1217 * _get_addr_space_by_name - fetch address space start & end by name 1218 * @oh: struct omap_hwmod * to operate on 1219 * @name: pointer to the name of the address space to fetch (optional) 1220 * @pa_start: pointer to a u32 to store the starting address to 1221 * @pa_end: pointer to a u32 to store the ending address to 1222 * 1223 * Retrieve address space start and end addresses for the IP block 1224 * pointed to by @oh. The data will be filled into the addresses 1225 * pointed to by @pa_start and @pa_end. When @name is non-null, the 1226 * address space data associated with the named entry will be 1227 * returned. If @name is null, the first matching entry will be 1228 * returned. Data order is not meaningful in hwmod data, so callers 1229 * are strongly encouraged to use a non-null @name whenever possible 1230 * to avoid unpredictable effects if hwmod data is later added that 1231 * causes data ordering to change. Returns 0 upon success or a 1232 * negative error code upon error. 1233 */ 1234 static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name, 1235 u32 *pa_start, u32 *pa_end) 1236 { 1237 int i, j; 1238 struct omap_hwmod_ocp_if *os; 1239 struct list_head *p = NULL; 1240 bool found = false; 1241 1242 p = oh->slave_ports.next; 1243 1244 i = 0; 1245 while (i < oh->slaves_cnt) { 1246 os = _fetch_next_ocp_if(&p, &i); 1247 1248 if (!os->addr) 1249 return -ENOENT; 1250 1251 j = 0; 1252 while (os->addr[j].pa_start != os->addr[j].pa_end) { 1253 if (name == os->addr[j].name || 1254 !strcmp(name, os->addr[j].name)) { 1255 found = true; 1256 break; 1257 } 1258 j++; 1259 } 1260 1261 if (found) 1262 break; 1263 } 1264 1265 if (!found) 1266 return -ENOENT; 1267 1268 *pa_start = os->addr[j].pa_start; 1269 *pa_end = os->addr[j].pa_end; 1270 1271 return 0; 1272 } 1273 1274 /** 1275 * _save_mpu_port_index - find and save the index to @oh's MPU port 1276 * @oh: struct omap_hwmod * 1277 * 1278 * Determines the array index of the OCP slave port that the MPU uses 1279 * to address the device, and saves it into the struct omap_hwmod. 1280 * Intended to be called during hwmod registration only. No return 1281 * value. 1282 */ 1283 static void __init _save_mpu_port_index(struct omap_hwmod *oh) 1284 { 1285 struct omap_hwmod_ocp_if *os = NULL; 1286 struct list_head *p; 1287 int i = 0; 1288 1289 if (!oh) 1290 return; 1291 1292 oh->_int_flags |= _HWMOD_NO_MPU_PORT; 1293 1294 p = oh->slave_ports.next; 1295 1296 while (i < oh->slaves_cnt) { 1297 os = _fetch_next_ocp_if(&p, &i); 1298 if (os->user & OCP_USER_MPU) { 1299 oh->_mpu_port = os; 1300 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT; 1301 break; 1302 } 1303 } 1304 1305 return; 1306 } 1307 1308 /** 1309 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU 1310 * @oh: struct omap_hwmod * 1311 * 1312 * Given a pointer to a struct omap_hwmod record @oh, return a pointer 1313 * to the struct omap_hwmod_ocp_if record that is used by the MPU to 1314 * communicate with the IP block. This interface need not be directly 1315 * connected to the MPU (and almost certainly is not), but is directly 1316 * connected to the IP block represented by @oh. Returns a pointer 1317 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon 1318 * error or if there does not appear to be a path from the MPU to this 1319 * IP block. 1320 */ 1321 static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh) 1322 { 1323 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0) 1324 return NULL; 1325 1326 return oh->_mpu_port; 1327 }; 1328 1329 /** 1330 * _find_mpu_rt_addr_space - return MPU register target address space for @oh 1331 * @oh: struct omap_hwmod * 1332 * 1333 * Returns a pointer to the struct omap_hwmod_addr_space record representing 1334 * the register target MPU address space; or returns NULL upon error. 1335 */ 1336 static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap_hwmod *oh) 1337 { 1338 struct omap_hwmod_ocp_if *os; 1339 struct omap_hwmod_addr_space *mem; 1340 int found = 0, i = 0; 1341 1342 os = _find_mpu_rt_port(oh); 1343 if (!os || !os->addr) 1344 return NULL; 1345 1346 do { 1347 mem = &os->addr[i++]; 1348 if (mem->flags & ADDR_TYPE_RT) 1349 found = 1; 1350 } while (!found && mem->pa_start != mem->pa_end); 1351 1352 return (found) ? mem : NULL; 1353 } 1354 1355 /** 1356 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG 1357 * @oh: struct omap_hwmod * 1358 * 1359 * Ensure that the OCP_SYSCONFIG register for the IP block represented 1360 * by @oh is set to indicate to the PRCM that the IP block is active. 1361 * Usually this means placing the module into smart-idle mode and 1362 * smart-standby, but if there is a bug in the automatic idle handling 1363 * for the IP block, it may need to be placed into the force-idle or 1364 * no-idle variants of these modes. No return value. 1365 */ 1366 static void _enable_sysc(struct omap_hwmod *oh) 1367 { 1368 u8 idlemode, sf; 1369 u32 v; 1370 bool clkdm_act; 1371 struct clockdomain *clkdm; 1372 1373 if (!oh->class->sysc) 1374 return; 1375 1376 /* 1377 * Wait until reset has completed, this is needed as the IP 1378 * block is reset automatically by hardware in some cases 1379 * (off-mode for example), and the drivers require the 1380 * IP to be ready when they access it 1381 */ 1382 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET) 1383 _enable_optional_clocks(oh); 1384 _wait_softreset_complete(oh); 1385 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET) 1386 _disable_optional_clocks(oh); 1387 1388 v = oh->_sysc_cache; 1389 sf = oh->class->sysc->sysc_flags; 1390 1391 clkdm = _get_clkdm(oh); 1392 if (sf & SYSC_HAS_SIDLEMODE) { 1393 if (oh->flags & HWMOD_SWSUP_SIDLE || 1394 oh->flags & HWMOD_SWSUP_SIDLE_ACT) { 1395 idlemode = HWMOD_IDLEMODE_NO; 1396 } else { 1397 if (sf & SYSC_HAS_ENAWAKEUP) 1398 _enable_wakeup(oh, &v); 1399 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) 1400 idlemode = HWMOD_IDLEMODE_SMART_WKUP; 1401 else 1402 idlemode = HWMOD_IDLEMODE_SMART; 1403 } 1404 1405 /* 1406 * This is special handling for some IPs like 1407 * 32k sync timer. Force them to idle! 1408 */ 1409 clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU); 1410 if (clkdm_act && !(oh->class->sysc->idlemodes & 1411 (SIDLE_SMART | SIDLE_SMART_WKUP))) 1412 idlemode = HWMOD_IDLEMODE_FORCE; 1413 1414 _set_slave_idlemode(oh, idlemode, &v); 1415 } 1416 1417 if (sf & SYSC_HAS_MIDLEMODE) { 1418 if (oh->flags & HWMOD_FORCE_MSTANDBY) { 1419 idlemode = HWMOD_IDLEMODE_FORCE; 1420 } else if (oh->flags & HWMOD_SWSUP_MSTANDBY) { 1421 idlemode = HWMOD_IDLEMODE_NO; 1422 } else { 1423 if (sf & SYSC_HAS_ENAWAKEUP) 1424 _enable_wakeup(oh, &v); 1425 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) 1426 idlemode = HWMOD_IDLEMODE_SMART_WKUP; 1427 else 1428 idlemode = HWMOD_IDLEMODE_SMART; 1429 } 1430 _set_master_standbymode(oh, idlemode, &v); 1431 } 1432 1433 /* 1434 * XXX The clock framework should handle this, by 1435 * calling into this code. But this must wait until the 1436 * clock structures are tagged with omap_hwmod entries 1437 */ 1438 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) && 1439 (sf & SYSC_HAS_CLOCKACTIVITY)) 1440 _set_clockactivity(oh, oh->class->sysc->clockact, &v); 1441 1442 /* If the cached value is the same as the new value, skip the write */ 1443 if (oh->_sysc_cache != v) 1444 _write_sysconfig(v, oh); 1445 1446 /* 1447 * Set the autoidle bit only after setting the smartidle bit 1448 * Setting this will not have any impact on the other modules. 1449 */ 1450 if (sf & SYSC_HAS_AUTOIDLE) { 1451 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ? 1452 0 : 1; 1453 _set_module_autoidle(oh, idlemode, &v); 1454 _write_sysconfig(v, oh); 1455 } 1456 } 1457 1458 /** 1459 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG 1460 * @oh: struct omap_hwmod * 1461 * 1462 * If module is marked as SWSUP_SIDLE, force the module into slave 1463 * idle; otherwise, configure it for smart-idle. If module is marked 1464 * as SWSUP_MSUSPEND, force the module into master standby; otherwise, 1465 * configure it for smart-standby. No return value. 1466 */ 1467 static void _idle_sysc(struct omap_hwmod *oh) 1468 { 1469 u8 idlemode, sf; 1470 u32 v; 1471 1472 if (!oh->class->sysc) 1473 return; 1474 1475 v = oh->_sysc_cache; 1476 sf = oh->class->sysc->sysc_flags; 1477 1478 if (sf & SYSC_HAS_SIDLEMODE) { 1479 if (oh->flags & HWMOD_SWSUP_SIDLE) { 1480 idlemode = HWMOD_IDLEMODE_FORCE; 1481 } else { 1482 if (sf & SYSC_HAS_ENAWAKEUP) 1483 _enable_wakeup(oh, &v); 1484 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) 1485 idlemode = HWMOD_IDLEMODE_SMART_WKUP; 1486 else 1487 idlemode = HWMOD_IDLEMODE_SMART; 1488 } 1489 _set_slave_idlemode(oh, idlemode, &v); 1490 } 1491 1492 if (sf & SYSC_HAS_MIDLEMODE) { 1493 if ((oh->flags & HWMOD_SWSUP_MSTANDBY) || 1494 (oh->flags & HWMOD_FORCE_MSTANDBY)) { 1495 idlemode = HWMOD_IDLEMODE_FORCE; 1496 } else { 1497 if (sf & SYSC_HAS_ENAWAKEUP) 1498 _enable_wakeup(oh, &v); 1499 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) 1500 idlemode = HWMOD_IDLEMODE_SMART_WKUP; 1501 else 1502 idlemode = HWMOD_IDLEMODE_SMART; 1503 } 1504 _set_master_standbymode(oh, idlemode, &v); 1505 } 1506 1507 _write_sysconfig(v, oh); 1508 } 1509 1510 /** 1511 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG 1512 * @oh: struct omap_hwmod * 1513 * 1514 * Force the module into slave idle and master suspend. No return 1515 * value. 1516 */ 1517 static void _shutdown_sysc(struct omap_hwmod *oh) 1518 { 1519 u32 v; 1520 u8 sf; 1521 1522 if (!oh->class->sysc) 1523 return; 1524 1525 v = oh->_sysc_cache; 1526 sf = oh->class->sysc->sysc_flags; 1527 1528 if (sf & SYSC_HAS_SIDLEMODE) 1529 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v); 1530 1531 if (sf & SYSC_HAS_MIDLEMODE) 1532 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v); 1533 1534 if (sf & SYSC_HAS_AUTOIDLE) 1535 _set_module_autoidle(oh, 1, &v); 1536 1537 _write_sysconfig(v, oh); 1538 } 1539 1540 /** 1541 * _lookup - find an omap_hwmod by name 1542 * @name: find an omap_hwmod by name 1543 * 1544 * Return a pointer to an omap_hwmod by name, or NULL if not found. 1545 */ 1546 static struct omap_hwmod *_lookup(const char *name) 1547 { 1548 struct omap_hwmod *oh, *temp_oh; 1549 1550 oh = NULL; 1551 1552 list_for_each_entry(temp_oh, &omap_hwmod_list, node) { 1553 if (!strcmp(name, temp_oh->name)) { 1554 oh = temp_oh; 1555 break; 1556 } 1557 } 1558 1559 return oh; 1560 } 1561 1562 /** 1563 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod 1564 * @oh: struct omap_hwmod * 1565 * 1566 * Convert a clockdomain name stored in a struct omap_hwmod into a 1567 * clockdomain pointer, and save it into the struct omap_hwmod. 1568 * Return -EINVAL if the clkdm_name lookup failed. 1569 */ 1570 static int _init_clkdm(struct omap_hwmod *oh) 1571 { 1572 if (!oh->clkdm_name) { 1573 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name); 1574 return 0; 1575 } 1576 1577 oh->clkdm = clkdm_lookup(oh->clkdm_name); 1578 if (!oh->clkdm) { 1579 pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n", 1580 oh->name, oh->clkdm_name); 1581 return 0; 1582 } 1583 1584 pr_debug("omap_hwmod: %s: associated to clkdm %s\n", 1585 oh->name, oh->clkdm_name); 1586 1587 return 0; 1588 } 1589 1590 /** 1591 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as 1592 * well the clockdomain. 1593 * @oh: struct omap_hwmod * 1594 * @data: not used; pass NULL 1595 * 1596 * Called by omap_hwmod_setup_*() (after omap2_clk_init()). 1597 * Resolves all clock names embedded in the hwmod. Returns 0 on 1598 * success, or a negative error code on failure. 1599 */ 1600 static int _init_clocks(struct omap_hwmod *oh, void *data) 1601 { 1602 int ret = 0; 1603 1604 if (oh->_state != _HWMOD_STATE_REGISTERED) 1605 return 0; 1606 1607 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name); 1608 1609 if (soc_ops.init_clkdm) 1610 ret |= soc_ops.init_clkdm(oh); 1611 1612 ret |= _init_main_clk(oh); 1613 ret |= _init_interface_clks(oh); 1614 ret |= _init_opt_clks(oh); 1615 1616 if (!ret) 1617 oh->_state = _HWMOD_STATE_CLKS_INITED; 1618 else 1619 pr_warn("omap_hwmod: %s: cannot _init_clocks\n", oh->name); 1620 1621 return ret; 1622 } 1623 1624 /** 1625 * _lookup_hardreset - fill register bit info for this hwmod/reset line 1626 * @oh: struct omap_hwmod * 1627 * @name: name of the reset line in the context of this hwmod 1628 * @ohri: struct omap_hwmod_rst_info * that this function will fill in 1629 * 1630 * Return the bit position of the reset line that match the 1631 * input name. Return -ENOENT if not found. 1632 */ 1633 static int _lookup_hardreset(struct omap_hwmod *oh, const char *name, 1634 struct omap_hwmod_rst_info *ohri) 1635 { 1636 int i; 1637 1638 for (i = 0; i < oh->rst_lines_cnt; i++) { 1639 const char *rst_line = oh->rst_lines[i].name; 1640 if (!strcmp(rst_line, name)) { 1641 ohri->rst_shift = oh->rst_lines[i].rst_shift; 1642 ohri->st_shift = oh->rst_lines[i].st_shift; 1643 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n", 1644 oh->name, __func__, rst_line, ohri->rst_shift, 1645 ohri->st_shift); 1646 1647 return 0; 1648 } 1649 } 1650 1651 return -ENOENT; 1652 } 1653 1654 /** 1655 * _assert_hardreset - assert the HW reset line of submodules 1656 * contained in the hwmod module. 1657 * @oh: struct omap_hwmod * 1658 * @name: name of the reset line to lookup and assert 1659 * 1660 * Some IP like dsp, ipu or iva contain processor that require an HW 1661 * reset line to be assert / deassert in order to enable fully the IP. 1662 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of 1663 * asserting the hardreset line on the currently-booted SoC, or passes 1664 * along the return value from _lookup_hardreset() or the SoC's 1665 * assert_hardreset code. 1666 */ 1667 static int _assert_hardreset(struct omap_hwmod *oh, const char *name) 1668 { 1669 struct omap_hwmod_rst_info ohri; 1670 int ret = -EINVAL; 1671 1672 if (!oh) 1673 return -EINVAL; 1674 1675 if (!soc_ops.assert_hardreset) 1676 return -ENOSYS; 1677 1678 ret = _lookup_hardreset(oh, name, &ohri); 1679 if (ret < 0) 1680 return ret; 1681 1682 ret = soc_ops.assert_hardreset(oh, &ohri); 1683 1684 return ret; 1685 } 1686 1687 /** 1688 * _deassert_hardreset - deassert the HW reset line of submodules contained 1689 * in the hwmod module. 1690 * @oh: struct omap_hwmod * 1691 * @name: name of the reset line to look up and deassert 1692 * 1693 * Some IP like dsp, ipu or iva contain processor that require an HW 1694 * reset line to be assert / deassert in order to enable fully the IP. 1695 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of 1696 * deasserting the hardreset line on the currently-booted SoC, or passes 1697 * along the return value from _lookup_hardreset() or the SoC's 1698 * deassert_hardreset code. 1699 */ 1700 static int _deassert_hardreset(struct omap_hwmod *oh, const char *name) 1701 { 1702 struct omap_hwmod_rst_info ohri; 1703 int ret = -EINVAL; 1704 int hwsup = 0; 1705 1706 if (!oh) 1707 return -EINVAL; 1708 1709 if (!soc_ops.deassert_hardreset) 1710 return -ENOSYS; 1711 1712 ret = _lookup_hardreset(oh, name, &ohri); 1713 if (ret < 0) 1714 return ret; 1715 1716 if (oh->clkdm) { 1717 /* 1718 * A clockdomain must be in SW_SUP otherwise reset 1719 * might not be completed. The clockdomain can be set 1720 * in HW_AUTO only when the module become ready. 1721 */ 1722 hwsup = clkdm_in_hwsup(oh->clkdm); 1723 ret = clkdm_hwmod_enable(oh->clkdm, oh); 1724 if (ret) { 1725 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n", 1726 oh->name, oh->clkdm->name, ret); 1727 return ret; 1728 } 1729 } 1730 1731 _enable_clocks(oh); 1732 if (soc_ops.enable_module) 1733 soc_ops.enable_module(oh); 1734 1735 ret = soc_ops.deassert_hardreset(oh, &ohri); 1736 1737 if (soc_ops.disable_module) 1738 soc_ops.disable_module(oh); 1739 _disable_clocks(oh); 1740 1741 if (ret == -EBUSY) 1742 pr_warn("omap_hwmod: %s: failed to hardreset\n", oh->name); 1743 1744 if (!ret) { 1745 /* 1746 * Set the clockdomain to HW_AUTO, assuming that the 1747 * previous state was HW_AUTO. 1748 */ 1749 if (oh->clkdm && hwsup) 1750 clkdm_allow_idle(oh->clkdm); 1751 } else { 1752 if (oh->clkdm) 1753 clkdm_hwmod_disable(oh->clkdm, oh); 1754 } 1755 1756 return ret; 1757 } 1758 1759 /** 1760 * _read_hardreset - read the HW reset line state of submodules 1761 * contained in the hwmod module 1762 * @oh: struct omap_hwmod * 1763 * @name: name of the reset line to look up and read 1764 * 1765 * Return the state of the reset line. Returns -EINVAL if @oh is 1766 * null, -ENOSYS if we have no way of reading the hardreset line 1767 * status on the currently-booted SoC, or passes along the return 1768 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted 1769 * code. 1770 */ 1771 static int _read_hardreset(struct omap_hwmod *oh, const char *name) 1772 { 1773 struct omap_hwmod_rst_info ohri; 1774 int ret = -EINVAL; 1775 1776 if (!oh) 1777 return -EINVAL; 1778 1779 if (!soc_ops.is_hardreset_asserted) 1780 return -ENOSYS; 1781 1782 ret = _lookup_hardreset(oh, name, &ohri); 1783 if (ret < 0) 1784 return ret; 1785 1786 return soc_ops.is_hardreset_asserted(oh, &ohri); 1787 } 1788 1789 /** 1790 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset 1791 * @oh: struct omap_hwmod * 1792 * 1793 * If all hardreset lines associated with @oh are asserted, then return true. 1794 * Otherwise, if part of @oh is out hardreset or if no hardreset lines 1795 * associated with @oh are asserted, then return false. 1796 * This function is used to avoid executing some parts of the IP block 1797 * enable/disable sequence if its hardreset line is set. 1798 */ 1799 static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh) 1800 { 1801 int i, rst_cnt = 0; 1802 1803 if (oh->rst_lines_cnt == 0) 1804 return false; 1805 1806 for (i = 0; i < oh->rst_lines_cnt; i++) 1807 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0) 1808 rst_cnt++; 1809 1810 if (oh->rst_lines_cnt == rst_cnt) 1811 return true; 1812 1813 return false; 1814 } 1815 1816 /** 1817 * _are_any_hardreset_lines_asserted - return true if any part of @oh is 1818 * hard-reset 1819 * @oh: struct omap_hwmod * 1820 * 1821 * If any hardreset lines associated with @oh are asserted, then 1822 * return true. Otherwise, if no hardreset lines associated with @oh 1823 * are asserted, or if @oh has no hardreset lines, then return false. 1824 * This function is used to avoid executing some parts of the IP block 1825 * enable/disable sequence if any hardreset line is set. 1826 */ 1827 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh) 1828 { 1829 int rst_cnt = 0; 1830 int i; 1831 1832 for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++) 1833 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0) 1834 rst_cnt++; 1835 1836 return (rst_cnt) ? true : false; 1837 } 1838 1839 /** 1840 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4 1841 * @oh: struct omap_hwmod * 1842 * 1843 * Disable the PRCM module mode related to the hwmod @oh. 1844 * Return EINVAL if the modulemode is not supported and 0 in case of success. 1845 */ 1846 static int _omap4_disable_module(struct omap_hwmod *oh) 1847 { 1848 int v; 1849 1850 if (!oh->clkdm || !oh->prcm.omap4.modulemode) 1851 return -EINVAL; 1852 1853 /* 1854 * Since integration code might still be doing something, only 1855 * disable if all lines are under hardreset. 1856 */ 1857 if (_are_any_hardreset_lines_asserted(oh)) 1858 return 0; 1859 1860 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__); 1861 1862 omap4_cminst_module_disable(oh->clkdm->prcm_partition, 1863 oh->clkdm->cm_inst, 1864 oh->clkdm->clkdm_offs, 1865 oh->prcm.omap4.clkctrl_offs); 1866 1867 v = _omap4_wait_target_disable(oh); 1868 if (v) 1869 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n", 1870 oh->name); 1871 1872 return 0; 1873 } 1874 1875 /** 1876 * _am33xx_disable_module - enable CLKCTRL modulemode on AM33XX 1877 * @oh: struct omap_hwmod * 1878 * 1879 * Disable the PRCM module mode related to the hwmod @oh. 1880 * Return EINVAL if the modulemode is not supported and 0 in case of success. 1881 */ 1882 static int _am33xx_disable_module(struct omap_hwmod *oh) 1883 { 1884 int v; 1885 1886 if (!oh->clkdm || !oh->prcm.omap4.modulemode) 1887 return -EINVAL; 1888 1889 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__); 1890 1891 if (_are_any_hardreset_lines_asserted(oh)) 1892 return 0; 1893 1894 am33xx_cm_module_disable(oh->clkdm->cm_inst, oh->clkdm->clkdm_offs, 1895 oh->prcm.omap4.clkctrl_offs); 1896 1897 v = _am33xx_wait_target_disable(oh); 1898 if (v) 1899 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n", 1900 oh->name); 1901 1902 return 0; 1903 } 1904 1905 /** 1906 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit 1907 * @oh: struct omap_hwmod * 1908 * 1909 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be 1910 * enabled for this to work. Returns -ENOENT if the hwmod cannot be 1911 * reset this way, -EINVAL if the hwmod is in the wrong state, 1912 * -ETIMEDOUT if the module did not reset in time, or 0 upon success. 1913 * 1914 * In OMAP3 a specific SYSSTATUS register is used to get the reset status. 1915 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead 1916 * use the SYSCONFIG softreset bit to provide the status. 1917 * 1918 * Note that some IP like McBSP do have reset control but don't have 1919 * reset status. 1920 */ 1921 static int _ocp_softreset(struct omap_hwmod *oh) 1922 { 1923 u32 v; 1924 int c = 0; 1925 int ret = 0; 1926 1927 if (!oh->class->sysc || 1928 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET)) 1929 return -ENOENT; 1930 1931 /* clocks must be on for this operation */ 1932 if (oh->_state != _HWMOD_STATE_ENABLED) { 1933 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n", 1934 oh->name); 1935 return -EINVAL; 1936 } 1937 1938 /* For some modules, all optionnal clocks need to be enabled as well */ 1939 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET) 1940 _enable_optional_clocks(oh); 1941 1942 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name); 1943 1944 v = oh->_sysc_cache; 1945 ret = _set_softreset(oh, &v); 1946 if (ret) 1947 goto dis_opt_clks; 1948 1949 _write_sysconfig(v, oh); 1950 1951 if (oh->class->sysc->srst_udelay) 1952 udelay(oh->class->sysc->srst_udelay); 1953 1954 c = _wait_softreset_complete(oh); 1955 if (c == MAX_MODULE_SOFTRESET_WAIT) { 1956 pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n", 1957 oh->name, MAX_MODULE_SOFTRESET_WAIT); 1958 ret = -ETIMEDOUT; 1959 goto dis_opt_clks; 1960 } else { 1961 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c); 1962 } 1963 1964 ret = _clear_softreset(oh, &v); 1965 if (ret) 1966 goto dis_opt_clks; 1967 1968 _write_sysconfig(v, oh); 1969 1970 /* 1971 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from 1972 * _wait_target_ready() or _reset() 1973 */ 1974 1975 dis_opt_clks: 1976 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET) 1977 _disable_optional_clocks(oh); 1978 1979 return ret; 1980 } 1981 1982 /** 1983 * _reset - reset an omap_hwmod 1984 * @oh: struct omap_hwmod * 1985 * 1986 * Resets an omap_hwmod @oh. If the module has a custom reset 1987 * function pointer defined, then call it to reset the IP block, and 1988 * pass along its return value to the caller. Otherwise, if the IP 1989 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield 1990 * associated with it, call a function to reset the IP block via that 1991 * method, and pass along the return value to the caller. Finally, if 1992 * the IP block has some hardreset lines associated with it, assert 1993 * all of those, but do _not_ deassert them. (This is because driver 1994 * authors have expressed an apparent requirement to control the 1995 * deassertion of the hardreset lines themselves.) 1996 * 1997 * The default software reset mechanism for most OMAP IP blocks is 1998 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some 1999 * hwmods cannot be reset via this method. Some are not targets and 2000 * therefore have no OCP header registers to access. Others (like the 2001 * IVA) have idiosyncratic reset sequences. So for these relatively 2002 * rare cases, custom reset code can be supplied in the struct 2003 * omap_hwmod_class .reset function pointer. 2004 * 2005 * _set_dmadisable() is called to set the DMADISABLE bit so that it 2006 * does not prevent idling of the system. This is necessary for cases 2007 * where ROMCODE/BOOTLOADER uses dma and transfers control to the 2008 * kernel without disabling dma. 2009 * 2010 * Passes along the return value from either _ocp_softreset() or the 2011 * custom reset function - these must return -EINVAL if the hwmod 2012 * cannot be reset this way or if the hwmod is in the wrong state, 2013 * -ETIMEDOUT if the module did not reset in time, or 0 upon success. 2014 */ 2015 static int _reset(struct omap_hwmod *oh) 2016 { 2017 int i, r; 2018 2019 pr_debug("omap_hwmod: %s: resetting\n", oh->name); 2020 2021 if (oh->class->reset) { 2022 r = oh->class->reset(oh); 2023 } else { 2024 if (oh->rst_lines_cnt > 0) { 2025 for (i = 0; i < oh->rst_lines_cnt; i++) 2026 _assert_hardreset(oh, oh->rst_lines[i].name); 2027 return 0; 2028 } else { 2029 r = _ocp_softreset(oh); 2030 if (r == -ENOENT) 2031 r = 0; 2032 } 2033 } 2034 2035 _set_dmadisable(oh); 2036 2037 /* 2038 * OCP_SYSCONFIG bits need to be reprogrammed after a 2039 * softreset. The _enable() function should be split to avoid 2040 * the rewrite of the OCP_SYSCONFIG register. 2041 */ 2042 if (oh->class->sysc) { 2043 _update_sysc_cache(oh); 2044 _enable_sysc(oh); 2045 } 2046 2047 return r; 2048 } 2049 2050 /** 2051 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain 2052 * 2053 * Call the appropriate PRM function to clear any logged I/O chain 2054 * wakeups and to reconfigure the chain. This apparently needs to be 2055 * done upon every mux change. Since hwmods can be concurrently 2056 * enabled and idled, hold a spinlock around the I/O chain 2057 * reconfiguration sequence. No return value. 2058 * 2059 * XXX When the PRM code is moved to drivers, this function can be removed, 2060 * as the PRM infrastructure should abstract this. 2061 */ 2062 static void _reconfigure_io_chain(void) 2063 { 2064 unsigned long flags; 2065 2066 spin_lock_irqsave(&io_chain_lock, flags); 2067 2068 if (cpu_is_omap34xx()) 2069 omap3xxx_prm_reconfigure_io_chain(); 2070 else if (cpu_is_omap44xx()) 2071 omap44xx_prm_reconfigure_io_chain(); 2072 2073 spin_unlock_irqrestore(&io_chain_lock, flags); 2074 } 2075 2076 /** 2077 * _omap4_update_context_lost - increment hwmod context loss counter if 2078 * hwmod context was lost, and clear hardware context loss reg 2079 * @oh: hwmod to check for context loss 2080 * 2081 * If the PRCM indicates that the hwmod @oh lost context, increment 2082 * our in-memory context loss counter, and clear the RM_*_CONTEXT 2083 * bits. No return value. 2084 */ 2085 static void _omap4_update_context_lost(struct omap_hwmod *oh) 2086 { 2087 if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT) 2088 return; 2089 2090 if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition, 2091 oh->clkdm->pwrdm.ptr->prcm_offs, 2092 oh->prcm.omap4.context_offs)) 2093 return; 2094 2095 oh->prcm.omap4.context_lost_counter++; 2096 prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition, 2097 oh->clkdm->pwrdm.ptr->prcm_offs, 2098 oh->prcm.omap4.context_offs); 2099 } 2100 2101 /** 2102 * _omap4_get_context_lost - get context loss counter for a hwmod 2103 * @oh: hwmod to get context loss counter for 2104 * 2105 * Returns the in-memory context loss counter for a hwmod. 2106 */ 2107 static int _omap4_get_context_lost(struct omap_hwmod *oh) 2108 { 2109 return oh->prcm.omap4.context_lost_counter; 2110 } 2111 2112 /** 2113 * _enable_preprogram - Pre-program an IP block during the _enable() process 2114 * @oh: struct omap_hwmod * 2115 * 2116 * Some IP blocks (such as AESS) require some additional programming 2117 * after enable before they can enter idle. If a function pointer to 2118 * do so is present in the hwmod data, then call it and pass along the 2119 * return value; otherwise, return 0. 2120 */ 2121 static int _enable_preprogram(struct omap_hwmod *oh) 2122 { 2123 if (!oh->class->enable_preprogram) 2124 return 0; 2125 2126 return oh->class->enable_preprogram(oh); 2127 } 2128 2129 /** 2130 * _enable - enable an omap_hwmod 2131 * @oh: struct omap_hwmod * 2132 * 2133 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's 2134 * register target. Returns -EINVAL if the hwmod is in the wrong 2135 * state or passes along the return value of _wait_target_ready(). 2136 */ 2137 static int _enable(struct omap_hwmod *oh) 2138 { 2139 int r; 2140 int hwsup = 0; 2141 2142 pr_debug("omap_hwmod: %s: enabling\n", oh->name); 2143 2144 /* 2145 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled 2146 * state at init. Now that someone is really trying to enable 2147 * them, just ensure that the hwmod mux is set. 2148 */ 2149 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) { 2150 /* 2151 * If the caller has mux data populated, do the mux'ing 2152 * which wouldn't have been done as part of the _enable() 2153 * done during setup. 2154 */ 2155 if (oh->mux) 2156 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED); 2157 2158 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE; 2159 return 0; 2160 } 2161 2162 if (oh->_state != _HWMOD_STATE_INITIALIZED && 2163 oh->_state != _HWMOD_STATE_IDLE && 2164 oh->_state != _HWMOD_STATE_DISABLED) { 2165 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n", 2166 oh->name); 2167 return -EINVAL; 2168 } 2169 2170 /* 2171 * If an IP block contains HW reset lines and all of them are 2172 * asserted, we let integration code associated with that 2173 * block handle the enable. We've received very little 2174 * information on what those driver authors need, and until 2175 * detailed information is provided and the driver code is 2176 * posted to the public lists, this is probably the best we 2177 * can do. 2178 */ 2179 if (_are_all_hardreset_lines_asserted(oh)) 2180 return 0; 2181 2182 /* Mux pins for device runtime if populated */ 2183 if (oh->mux && (!oh->mux->enabled || 2184 ((oh->_state == _HWMOD_STATE_IDLE) && 2185 oh->mux->pads_dynamic))) { 2186 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED); 2187 _reconfigure_io_chain(); 2188 } else if (oh->flags & HWMOD_RECONFIG_IO_CHAIN) { 2189 _reconfigure_io_chain(); 2190 } 2191 2192 _add_initiator_dep(oh, mpu_oh); 2193 2194 if (oh->clkdm) { 2195 /* 2196 * A clockdomain must be in SW_SUP before enabling 2197 * completely the module. The clockdomain can be set 2198 * in HW_AUTO only when the module become ready. 2199 */ 2200 hwsup = clkdm_in_hwsup(oh->clkdm) && 2201 !clkdm_missing_idle_reporting(oh->clkdm); 2202 r = clkdm_hwmod_enable(oh->clkdm, oh); 2203 if (r) { 2204 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n", 2205 oh->name, oh->clkdm->name, r); 2206 return r; 2207 } 2208 } 2209 2210 _enable_clocks(oh); 2211 if (soc_ops.enable_module) 2212 soc_ops.enable_module(oh); 2213 if (oh->flags & HWMOD_BLOCK_WFI) 2214 cpu_idle_poll_ctrl(true); 2215 2216 if (soc_ops.update_context_lost) 2217 soc_ops.update_context_lost(oh); 2218 2219 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) : 2220 -EINVAL; 2221 if (!r) { 2222 /* 2223 * Set the clockdomain to HW_AUTO only if the target is ready, 2224 * assuming that the previous state was HW_AUTO 2225 */ 2226 if (oh->clkdm && hwsup) 2227 clkdm_allow_idle(oh->clkdm); 2228 2229 oh->_state = _HWMOD_STATE_ENABLED; 2230 2231 /* Access the sysconfig only if the target is ready */ 2232 if (oh->class->sysc) { 2233 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED)) 2234 _update_sysc_cache(oh); 2235 _enable_sysc(oh); 2236 } 2237 r = _enable_preprogram(oh); 2238 } else { 2239 if (soc_ops.disable_module) 2240 soc_ops.disable_module(oh); 2241 _disable_clocks(oh); 2242 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n", 2243 oh->name, r); 2244 2245 if (oh->clkdm) 2246 clkdm_hwmod_disable(oh->clkdm, oh); 2247 } 2248 2249 return r; 2250 } 2251 2252 /** 2253 * _idle - idle an omap_hwmod 2254 * @oh: struct omap_hwmod * 2255 * 2256 * Idles an omap_hwmod @oh. This should be called once the hwmod has 2257 * no further work. Returns -EINVAL if the hwmod is in the wrong 2258 * state or returns 0. 2259 */ 2260 static int _idle(struct omap_hwmod *oh) 2261 { 2262 pr_debug("omap_hwmod: %s: idling\n", oh->name); 2263 2264 if (oh->_state != _HWMOD_STATE_ENABLED) { 2265 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n", 2266 oh->name); 2267 return -EINVAL; 2268 } 2269 2270 if (_are_all_hardreset_lines_asserted(oh)) 2271 return 0; 2272 2273 if (oh->class->sysc) 2274 _idle_sysc(oh); 2275 _del_initiator_dep(oh, mpu_oh); 2276 2277 if (oh->flags & HWMOD_BLOCK_WFI) 2278 cpu_idle_poll_ctrl(false); 2279 if (soc_ops.disable_module) 2280 soc_ops.disable_module(oh); 2281 2282 /* 2283 * The module must be in idle mode before disabling any parents 2284 * clocks. Otherwise, the parent clock might be disabled before 2285 * the module transition is done, and thus will prevent the 2286 * transition to complete properly. 2287 */ 2288 _disable_clocks(oh); 2289 if (oh->clkdm) 2290 clkdm_hwmod_disable(oh->clkdm, oh); 2291 2292 /* Mux pins for device idle if populated */ 2293 if (oh->mux && oh->mux->pads_dynamic) { 2294 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE); 2295 _reconfigure_io_chain(); 2296 } else if (oh->flags & HWMOD_RECONFIG_IO_CHAIN) { 2297 _reconfigure_io_chain(); 2298 } 2299 2300 oh->_state = _HWMOD_STATE_IDLE; 2301 2302 return 0; 2303 } 2304 2305 /** 2306 * _shutdown - shutdown an omap_hwmod 2307 * @oh: struct omap_hwmod * 2308 * 2309 * Shut down an omap_hwmod @oh. This should be called when the driver 2310 * used for the hwmod is removed or unloaded or if the driver is not 2311 * used by the system. Returns -EINVAL if the hwmod is in the wrong 2312 * state or returns 0. 2313 */ 2314 static int _shutdown(struct omap_hwmod *oh) 2315 { 2316 int ret, i; 2317 u8 prev_state; 2318 2319 if (oh->_state != _HWMOD_STATE_IDLE && 2320 oh->_state != _HWMOD_STATE_ENABLED) { 2321 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n", 2322 oh->name); 2323 return -EINVAL; 2324 } 2325 2326 if (_are_all_hardreset_lines_asserted(oh)) 2327 return 0; 2328 2329 pr_debug("omap_hwmod: %s: disabling\n", oh->name); 2330 2331 if (oh->class->pre_shutdown) { 2332 prev_state = oh->_state; 2333 if (oh->_state == _HWMOD_STATE_IDLE) 2334 _enable(oh); 2335 ret = oh->class->pre_shutdown(oh); 2336 if (ret) { 2337 if (prev_state == _HWMOD_STATE_IDLE) 2338 _idle(oh); 2339 return ret; 2340 } 2341 } 2342 2343 if (oh->class->sysc) { 2344 if (oh->_state == _HWMOD_STATE_IDLE) 2345 _enable(oh); 2346 _shutdown_sysc(oh); 2347 } 2348 2349 /* clocks and deps are already disabled in idle */ 2350 if (oh->_state == _HWMOD_STATE_ENABLED) { 2351 _del_initiator_dep(oh, mpu_oh); 2352 /* XXX what about the other system initiators here? dma, dsp */ 2353 if (oh->flags & HWMOD_BLOCK_WFI) 2354 cpu_idle_poll_ctrl(false); 2355 if (soc_ops.disable_module) 2356 soc_ops.disable_module(oh); 2357 _disable_clocks(oh); 2358 if (oh->clkdm) 2359 clkdm_hwmod_disable(oh->clkdm, oh); 2360 } 2361 /* XXX Should this code also force-disable the optional clocks? */ 2362 2363 for (i = 0; i < oh->rst_lines_cnt; i++) 2364 _assert_hardreset(oh, oh->rst_lines[i].name); 2365 2366 /* Mux pins to safe mode or use populated off mode values */ 2367 if (oh->mux) 2368 omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED); 2369 2370 oh->_state = _HWMOD_STATE_DISABLED; 2371 2372 return 0; 2373 } 2374 2375 static int of_dev_find_hwmod(struct device_node *np, 2376 struct omap_hwmod *oh) 2377 { 2378 int count, i, res; 2379 const char *p; 2380 2381 count = of_property_count_strings(np, "ti,hwmods"); 2382 if (count < 1) 2383 return -ENODEV; 2384 2385 for (i = 0; i < count; i++) { 2386 res = of_property_read_string_index(np, "ti,hwmods", 2387 i, &p); 2388 if (res) 2389 continue; 2390 if (!strcmp(p, oh->name)) { 2391 pr_debug("omap_hwmod: dt %s[%i] uses hwmod %s\n", 2392 np->name, i, oh->name); 2393 return i; 2394 } 2395 } 2396 2397 return -ENODEV; 2398 } 2399 2400 /** 2401 * of_dev_hwmod_lookup - look up needed hwmod from dt blob 2402 * @np: struct device_node * 2403 * @oh: struct omap_hwmod * 2404 * @index: index of the entry found 2405 * @found: struct device_node * found or NULL 2406 * 2407 * Parse the dt blob and find out needed hwmod. Recursive function is 2408 * implemented to take care hierarchical dt blob parsing. 2409 * Return: Returns 0 on success, -ENODEV when not found. 2410 */ 2411 static int of_dev_hwmod_lookup(struct device_node *np, 2412 struct omap_hwmod *oh, 2413 int *index, 2414 struct device_node **found) 2415 { 2416 struct device_node *np0 = NULL; 2417 int res; 2418 2419 res = of_dev_find_hwmod(np, oh); 2420 if (res >= 0) { 2421 *found = np; 2422 *index = res; 2423 return 0; 2424 } 2425 2426 for_each_child_of_node(np, np0) { 2427 struct device_node *fc; 2428 int i; 2429 2430 res = of_dev_hwmod_lookup(np0, oh, &i, &fc); 2431 if (res == 0) { 2432 *found = fc; 2433 *index = i; 2434 return 0; 2435 } 2436 } 2437 2438 *found = NULL; 2439 *index = 0; 2440 2441 return -ENODEV; 2442 } 2443 2444 /** 2445 * _init_mpu_rt_base - populate the virtual address for a hwmod 2446 * @oh: struct omap_hwmod * to locate the virtual address 2447 * @data: (unused, caller should pass NULL) 2448 * @index: index of the reg entry iospace in device tree 2449 * @np: struct device_node * of the IP block's device node in the DT data 2450 * 2451 * Cache the virtual address used by the MPU to access this IP block's 2452 * registers. This address is needed early so the OCP registers that 2453 * are part of the device's address space can be ioremapped properly. 2454 * 2455 * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and 2456 * -ENXIO on absent or invalid register target address space. 2457 */ 2458 static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data, 2459 int index, struct device_node *np) 2460 { 2461 struct omap_hwmod_addr_space *mem; 2462 void __iomem *va_start = NULL; 2463 2464 if (!oh) 2465 return -EINVAL; 2466 2467 _save_mpu_port_index(oh); 2468 2469 if (oh->_int_flags & _HWMOD_NO_MPU_PORT) 2470 return -ENXIO; 2471 2472 mem = _find_mpu_rt_addr_space(oh); 2473 if (!mem) { 2474 pr_debug("omap_hwmod: %s: no MPU register target found\n", 2475 oh->name); 2476 2477 /* Extract the IO space from device tree blob */ 2478 if (!np) 2479 return -ENXIO; 2480 2481 va_start = of_iomap(np, index + oh->mpu_rt_idx); 2482 } else { 2483 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start); 2484 } 2485 2486 if (!va_start) { 2487 if (mem) 2488 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name); 2489 else 2490 pr_err("omap_hwmod: %s: Missing dt reg%i for %s\n", 2491 oh->name, index, np->full_name); 2492 return -ENXIO; 2493 } 2494 2495 pr_debug("omap_hwmod: %s: MPU register target at va %p\n", 2496 oh->name, va_start); 2497 2498 oh->_mpu_rt_va = va_start; 2499 return 0; 2500 } 2501 2502 /** 2503 * _init - initialize internal data for the hwmod @oh 2504 * @oh: struct omap_hwmod * 2505 * @n: (unused) 2506 * 2507 * Look up the clocks and the address space used by the MPU to access 2508 * registers belonging to the hwmod @oh. @oh must already be 2509 * registered at this point. This is the first of two phases for 2510 * hwmod initialization. Code called here does not touch any hardware 2511 * registers, it simply prepares internal data structures. Returns 0 2512 * upon success or if the hwmod isn't registered or if the hwmod's 2513 * address space is not defined, or -EINVAL upon failure. 2514 */ 2515 static int __init _init(struct omap_hwmod *oh, void *data) 2516 { 2517 int r, index; 2518 struct device_node *np = NULL; 2519 2520 if (oh->_state != _HWMOD_STATE_REGISTERED) 2521 return 0; 2522 2523 if (of_have_populated_dt()) { 2524 struct device_node *bus; 2525 2526 bus = of_find_node_by_name(NULL, "ocp"); 2527 if (!bus) 2528 return -ENODEV; 2529 2530 r = of_dev_hwmod_lookup(bus, oh, &index, &np); 2531 if (r) 2532 pr_debug("omap_hwmod: %s missing dt data\n", oh->name); 2533 else if (np && index) 2534 pr_warn("omap_hwmod: %s using broken dt data from %s\n", 2535 oh->name, np->name); 2536 } 2537 2538 if (oh->class->sysc) { 2539 r = _init_mpu_rt_base(oh, NULL, index, np); 2540 if (r < 0) { 2541 WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n", 2542 oh->name); 2543 return 0; 2544 } 2545 } 2546 2547 r = _init_clocks(oh, NULL); 2548 if (r < 0) { 2549 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name); 2550 return -EINVAL; 2551 } 2552 2553 if (np) { 2554 if (of_find_property(np, "ti,no-reset-on-init", NULL)) 2555 oh->flags |= HWMOD_INIT_NO_RESET; 2556 if (of_find_property(np, "ti,no-idle-on-init", NULL)) 2557 oh->flags |= HWMOD_INIT_NO_IDLE; 2558 } 2559 2560 oh->_state = _HWMOD_STATE_INITIALIZED; 2561 2562 return 0; 2563 } 2564 2565 /** 2566 * _setup_iclk_autoidle - configure an IP block's interface clocks 2567 * @oh: struct omap_hwmod * 2568 * 2569 * Set up the module's interface clocks. XXX This function is still mostly 2570 * a stub; implementing this properly requires iclk autoidle usecounting in 2571 * the clock code. No return value. 2572 */ 2573 static void __init _setup_iclk_autoidle(struct omap_hwmod *oh) 2574 { 2575 struct omap_hwmod_ocp_if *os; 2576 struct list_head *p; 2577 int i = 0; 2578 if (oh->_state != _HWMOD_STATE_INITIALIZED) 2579 return; 2580 2581 p = oh->slave_ports.next; 2582 2583 while (i < oh->slaves_cnt) { 2584 os = _fetch_next_ocp_if(&p, &i); 2585 if (!os->_clk) 2586 continue; 2587 2588 if (os->flags & OCPIF_SWSUP_IDLE) { 2589 /* XXX omap_iclk_deny_idle(c); */ 2590 } else { 2591 /* XXX omap_iclk_allow_idle(c); */ 2592 clk_enable(os->_clk); 2593 } 2594 } 2595 2596 return; 2597 } 2598 2599 /** 2600 * _setup_reset - reset an IP block during the setup process 2601 * @oh: struct omap_hwmod * 2602 * 2603 * Reset the IP block corresponding to the hwmod @oh during the setup 2604 * process. The IP block is first enabled so it can be successfully 2605 * reset. Returns 0 upon success or a negative error code upon 2606 * failure. 2607 */ 2608 static int __init _setup_reset(struct omap_hwmod *oh) 2609 { 2610 int r; 2611 2612 if (oh->_state != _HWMOD_STATE_INITIALIZED) 2613 return -EINVAL; 2614 2615 if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK) 2616 return -EPERM; 2617 2618 if (oh->rst_lines_cnt == 0) { 2619 r = _enable(oh); 2620 if (r) { 2621 pr_warn("omap_hwmod: %s: cannot be enabled for reset (%d)\n", 2622 oh->name, oh->_state); 2623 return -EINVAL; 2624 } 2625 } 2626 2627 if (!(oh->flags & HWMOD_INIT_NO_RESET)) 2628 r = _reset(oh); 2629 2630 return r; 2631 } 2632 2633 /** 2634 * _setup_postsetup - transition to the appropriate state after _setup 2635 * @oh: struct omap_hwmod * 2636 * 2637 * Place an IP block represented by @oh into a "post-setup" state -- 2638 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that 2639 * this function is called at the end of _setup().) The postsetup 2640 * state for an IP block can be changed by calling 2641 * omap_hwmod_enter_postsetup_state() early in the boot process, 2642 * before one of the omap_hwmod_setup*() functions are called for the 2643 * IP block. 2644 * 2645 * The IP block stays in this state until a PM runtime-based driver is 2646 * loaded for that IP block. A post-setup state of IDLE is 2647 * appropriate for almost all IP blocks with runtime PM-enabled 2648 * drivers, since those drivers are able to enable the IP block. A 2649 * post-setup state of ENABLED is appropriate for kernels with PM 2650 * runtime disabled. The DISABLED state is appropriate for unusual IP 2651 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers 2652 * included, since the WDTIMER starts running on reset and will reset 2653 * the MPU if left active. 2654 * 2655 * This post-setup mechanism is deprecated. Once all of the OMAP 2656 * drivers have been converted to use PM runtime, and all of the IP 2657 * block data and interconnect data is available to the hwmod code, it 2658 * should be possible to replace this mechanism with a "lazy reset" 2659 * arrangement. In a "lazy reset" setup, each IP block is enabled 2660 * when the driver first probes, then all remaining IP blocks without 2661 * drivers are either shut down or enabled after the drivers have 2662 * loaded. However, this cannot take place until the above 2663 * preconditions have been met, since otherwise the late reset code 2664 * has no way of knowing which IP blocks are in use by drivers, and 2665 * which ones are unused. 2666 * 2667 * No return value. 2668 */ 2669 static void __init _setup_postsetup(struct omap_hwmod *oh) 2670 { 2671 u8 postsetup_state; 2672 2673 if (oh->rst_lines_cnt > 0) 2674 return; 2675 2676 postsetup_state = oh->_postsetup_state; 2677 if (postsetup_state == _HWMOD_STATE_UNKNOWN) 2678 postsetup_state = _HWMOD_STATE_ENABLED; 2679 2680 /* 2681 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data - 2682 * it should be set by the core code as a runtime flag during startup 2683 */ 2684 if ((oh->flags & HWMOD_INIT_NO_IDLE) && 2685 (postsetup_state == _HWMOD_STATE_IDLE)) { 2686 oh->_int_flags |= _HWMOD_SKIP_ENABLE; 2687 postsetup_state = _HWMOD_STATE_ENABLED; 2688 } 2689 2690 if (postsetup_state == _HWMOD_STATE_IDLE) 2691 _idle(oh); 2692 else if (postsetup_state == _HWMOD_STATE_DISABLED) 2693 _shutdown(oh); 2694 else if (postsetup_state != _HWMOD_STATE_ENABLED) 2695 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n", 2696 oh->name, postsetup_state); 2697 2698 return; 2699 } 2700 2701 /** 2702 * _setup - prepare IP block hardware for use 2703 * @oh: struct omap_hwmod * 2704 * @n: (unused, pass NULL) 2705 * 2706 * Configure the IP block represented by @oh. This may include 2707 * enabling the IP block, resetting it, and placing it into a 2708 * post-setup state, depending on the type of IP block and applicable 2709 * flags. IP blocks are reset to prevent any previous configuration 2710 * by the bootloader or previous operating system from interfering 2711 * with power management or other parts of the system. The reset can 2712 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of 2713 * two phases for hwmod initialization. Code called here generally 2714 * affects the IP block hardware, or system integration hardware 2715 * associated with the IP block. Returns 0. 2716 */ 2717 static int __init _setup(struct omap_hwmod *oh, void *data) 2718 { 2719 if (oh->_state != _HWMOD_STATE_INITIALIZED) 2720 return 0; 2721 2722 _setup_iclk_autoidle(oh); 2723 2724 if (!_setup_reset(oh)) 2725 _setup_postsetup(oh); 2726 2727 return 0; 2728 } 2729 2730 /** 2731 * _register - register a struct omap_hwmod 2732 * @oh: struct omap_hwmod * 2733 * 2734 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod 2735 * already has been registered by the same name; -EINVAL if the 2736 * omap_hwmod is in the wrong state, if @oh is NULL, if the 2737 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a 2738 * name, or if the omap_hwmod's class is missing a name; or 0 upon 2739 * success. 2740 * 2741 * XXX The data should be copied into bootmem, so the original data 2742 * should be marked __initdata and freed after init. This would allow 2743 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note 2744 * that the copy process would be relatively complex due to the large number 2745 * of substructures. 2746 */ 2747 static int __init _register(struct omap_hwmod *oh) 2748 { 2749 if (!oh || !oh->name || !oh->class || !oh->class->name || 2750 (oh->_state != _HWMOD_STATE_UNKNOWN)) 2751 return -EINVAL; 2752 2753 pr_debug("omap_hwmod: %s: registering\n", oh->name); 2754 2755 if (_lookup(oh->name)) 2756 return -EEXIST; 2757 2758 list_add_tail(&oh->node, &omap_hwmod_list); 2759 2760 INIT_LIST_HEAD(&oh->master_ports); 2761 INIT_LIST_HEAD(&oh->slave_ports); 2762 spin_lock_init(&oh->_lock); 2763 2764 oh->_state = _HWMOD_STATE_REGISTERED; 2765 2766 /* 2767 * XXX Rather than doing a strcmp(), this should test a flag 2768 * set in the hwmod data, inserted by the autogenerator code. 2769 */ 2770 if (!strcmp(oh->name, MPU_INITIATOR_NAME)) 2771 mpu_oh = oh; 2772 2773 return 0; 2774 } 2775 2776 /** 2777 * _alloc_links - return allocated memory for hwmod links 2778 * @ml: pointer to a struct omap_hwmod_link * for the master link 2779 * @sl: pointer to a struct omap_hwmod_link * for the slave link 2780 * 2781 * Return pointers to two struct omap_hwmod_link records, via the 2782 * addresses pointed to by @ml and @sl. Will first attempt to return 2783 * memory allocated as part of a large initial block, but if that has 2784 * been exhausted, will allocate memory itself. Since ideally this 2785 * second allocation path will never occur, the number of these 2786 * 'supplemental' allocations will be logged when debugging is 2787 * enabled. Returns 0. 2788 */ 2789 static int __init _alloc_links(struct omap_hwmod_link **ml, 2790 struct omap_hwmod_link **sl) 2791 { 2792 unsigned int sz; 2793 2794 if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) { 2795 *ml = &linkspace[free_ls++]; 2796 *sl = &linkspace[free_ls++]; 2797 return 0; 2798 } 2799 2800 sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF; 2801 2802 *sl = NULL; 2803 *ml = memblock_virt_alloc(sz, 0); 2804 2805 *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link); 2806 2807 ls_supp++; 2808 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n", 2809 ls_supp * LINKS_PER_OCP_IF); 2810 2811 return 0; 2812 }; 2813 2814 /** 2815 * _add_link - add an interconnect between two IP blocks 2816 * @oi: pointer to a struct omap_hwmod_ocp_if record 2817 * 2818 * Add struct omap_hwmod_link records connecting the master IP block 2819 * specified in @oi->master to @oi, and connecting the slave IP block 2820 * specified in @oi->slave to @oi. This code is assumed to run before 2821 * preemption or SMP has been enabled, thus avoiding the need for 2822 * locking in this code. Changes to this assumption will require 2823 * additional locking. Returns 0. 2824 */ 2825 static int __init _add_link(struct omap_hwmod_ocp_if *oi) 2826 { 2827 struct omap_hwmod_link *ml, *sl; 2828 2829 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name, 2830 oi->slave->name); 2831 2832 _alloc_links(&ml, &sl); 2833 2834 ml->ocp_if = oi; 2835 INIT_LIST_HEAD(&ml->node); 2836 list_add(&ml->node, &oi->master->master_ports); 2837 oi->master->masters_cnt++; 2838 2839 sl->ocp_if = oi; 2840 INIT_LIST_HEAD(&sl->node); 2841 list_add(&sl->node, &oi->slave->slave_ports); 2842 oi->slave->slaves_cnt++; 2843 2844 return 0; 2845 } 2846 2847 /** 2848 * _register_link - register a struct omap_hwmod_ocp_if 2849 * @oi: struct omap_hwmod_ocp_if * 2850 * 2851 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it 2852 * has already been registered; -EINVAL if @oi is NULL or if the 2853 * record pointed to by @oi is missing required fields; or 0 upon 2854 * success. 2855 * 2856 * XXX The data should be copied into bootmem, so the original data 2857 * should be marked __initdata and freed after init. This would allow 2858 * unneeded omap_hwmods to be freed on multi-OMAP configurations. 2859 */ 2860 static int __init _register_link(struct omap_hwmod_ocp_if *oi) 2861 { 2862 if (!oi || !oi->master || !oi->slave || !oi->user) 2863 return -EINVAL; 2864 2865 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED) 2866 return -EEXIST; 2867 2868 pr_debug("omap_hwmod: registering link from %s to %s\n", 2869 oi->master->name, oi->slave->name); 2870 2871 /* 2872 * Register the connected hwmods, if they haven't been 2873 * registered already 2874 */ 2875 if (oi->master->_state != _HWMOD_STATE_REGISTERED) 2876 _register(oi->master); 2877 2878 if (oi->slave->_state != _HWMOD_STATE_REGISTERED) 2879 _register(oi->slave); 2880 2881 _add_link(oi); 2882 2883 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED; 2884 2885 return 0; 2886 } 2887 2888 /** 2889 * _alloc_linkspace - allocate large block of hwmod links 2890 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count 2891 * 2892 * Allocate a large block of struct omap_hwmod_link records. This 2893 * improves boot time significantly by avoiding the need to allocate 2894 * individual records one by one. If the number of records to 2895 * allocate in the block hasn't been manually specified, this function 2896 * will count the number of struct omap_hwmod_ocp_if records in @ois 2897 * and use that to determine the allocation size. For SoC families 2898 * that require multiple list registrations, such as OMAP3xxx, this 2899 * estimation process isn't optimal, so manual estimation is advised 2900 * in those cases. Returns -EEXIST if the allocation has already occurred 2901 * or 0 upon success. 2902 */ 2903 static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois) 2904 { 2905 unsigned int i = 0; 2906 unsigned int sz; 2907 2908 if (linkspace) { 2909 WARN(1, "linkspace already allocated\n"); 2910 return -EEXIST; 2911 } 2912 2913 if (max_ls == 0) 2914 while (ois[i++]) 2915 max_ls += LINKS_PER_OCP_IF; 2916 2917 sz = sizeof(struct omap_hwmod_link) * max_ls; 2918 2919 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n", 2920 __func__, sz, max_ls); 2921 2922 linkspace = memblock_virt_alloc(sz, 0); 2923 2924 return 0; 2925 } 2926 2927 /* Static functions intended only for use in soc_ops field function pointers */ 2928 2929 /** 2930 * _omap2xxx_wait_target_ready - wait for a module to leave slave idle 2931 * @oh: struct omap_hwmod * 2932 * 2933 * Wait for a module @oh to leave slave idle. Returns 0 if the module 2934 * does not have an IDLEST bit or if the module successfully leaves 2935 * slave idle; otherwise, pass along the return value of the 2936 * appropriate *_cm*_wait_module_ready() function. 2937 */ 2938 static int _omap2xxx_wait_target_ready(struct omap_hwmod *oh) 2939 { 2940 if (!oh) 2941 return -EINVAL; 2942 2943 if (oh->flags & HWMOD_NO_IDLEST) 2944 return 0; 2945 2946 if (!_find_mpu_rt_port(oh)) 2947 return 0; 2948 2949 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */ 2950 2951 return omap2xxx_cm_wait_module_ready(oh->prcm.omap2.module_offs, 2952 oh->prcm.omap2.idlest_reg_id, 2953 oh->prcm.omap2.idlest_idle_bit); 2954 } 2955 2956 /** 2957 * _omap3xxx_wait_target_ready - wait for a module to leave slave idle 2958 * @oh: struct omap_hwmod * 2959 * 2960 * Wait for a module @oh to leave slave idle. Returns 0 if the module 2961 * does not have an IDLEST bit or if the module successfully leaves 2962 * slave idle; otherwise, pass along the return value of the 2963 * appropriate *_cm*_wait_module_ready() function. 2964 */ 2965 static int _omap3xxx_wait_target_ready(struct omap_hwmod *oh) 2966 { 2967 if (!oh) 2968 return -EINVAL; 2969 2970 if (oh->flags & HWMOD_NO_IDLEST) 2971 return 0; 2972 2973 if (!_find_mpu_rt_port(oh)) 2974 return 0; 2975 2976 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */ 2977 2978 return omap3xxx_cm_wait_module_ready(oh->prcm.omap2.module_offs, 2979 oh->prcm.omap2.idlest_reg_id, 2980 oh->prcm.omap2.idlest_idle_bit); 2981 } 2982 2983 /** 2984 * _omap4_wait_target_ready - wait for a module to leave slave idle 2985 * @oh: struct omap_hwmod * 2986 * 2987 * Wait for a module @oh to leave slave idle. Returns 0 if the module 2988 * does not have an IDLEST bit or if the module successfully leaves 2989 * slave idle; otherwise, pass along the return value of the 2990 * appropriate *_cm*_wait_module_ready() function. 2991 */ 2992 static int _omap4_wait_target_ready(struct omap_hwmod *oh) 2993 { 2994 if (!oh) 2995 return -EINVAL; 2996 2997 if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm) 2998 return 0; 2999 3000 if (!_find_mpu_rt_port(oh)) 3001 return 0; 3002 3003 /* XXX check module SIDLEMODE, hardreset status */ 3004 3005 return omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition, 3006 oh->clkdm->cm_inst, 3007 oh->clkdm->clkdm_offs, 3008 oh->prcm.omap4.clkctrl_offs); 3009 } 3010 3011 /** 3012 * _am33xx_wait_target_ready - wait for a module to leave slave idle 3013 * @oh: struct omap_hwmod * 3014 * 3015 * Wait for a module @oh to leave slave idle. Returns 0 if the module 3016 * does not have an IDLEST bit or if the module successfully leaves 3017 * slave idle; otherwise, pass along the return value of the 3018 * appropriate *_cm*_wait_module_ready() function. 3019 */ 3020 static int _am33xx_wait_target_ready(struct omap_hwmod *oh) 3021 { 3022 if (!oh || !oh->clkdm) 3023 return -EINVAL; 3024 3025 if (oh->flags & HWMOD_NO_IDLEST) 3026 return 0; 3027 3028 if (!_find_mpu_rt_port(oh)) 3029 return 0; 3030 3031 /* XXX check module SIDLEMODE, hardreset status */ 3032 3033 return am33xx_cm_wait_module_ready(oh->clkdm->cm_inst, 3034 oh->clkdm->clkdm_offs, 3035 oh->prcm.omap4.clkctrl_offs); 3036 } 3037 3038 /** 3039 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args 3040 * @oh: struct omap_hwmod * to assert hardreset 3041 * @ohri: hardreset line data 3042 * 3043 * Call omap2_prm_assert_hardreset() with parameters extracted from 3044 * the hwmod @oh and the hardreset line data @ohri. Only intended for 3045 * use as an soc_ops function pointer. Passes along the return value 3046 * from omap2_prm_assert_hardreset(). XXX This function is scheduled 3047 * for removal when the PRM code is moved into drivers/. 3048 */ 3049 static int _omap2_assert_hardreset(struct omap_hwmod *oh, 3050 struct omap_hwmod_rst_info *ohri) 3051 { 3052 return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs, 3053 ohri->rst_shift); 3054 } 3055 3056 /** 3057 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args 3058 * @oh: struct omap_hwmod * to deassert hardreset 3059 * @ohri: hardreset line data 3060 * 3061 * Call omap2_prm_deassert_hardreset() with parameters extracted from 3062 * the hwmod @oh and the hardreset line data @ohri. Only intended for 3063 * use as an soc_ops function pointer. Passes along the return value 3064 * from omap2_prm_deassert_hardreset(). XXX This function is 3065 * scheduled for removal when the PRM code is moved into drivers/. 3066 */ 3067 static int _omap2_deassert_hardreset(struct omap_hwmod *oh, 3068 struct omap_hwmod_rst_info *ohri) 3069 { 3070 return omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs, 3071 ohri->rst_shift, 3072 ohri->st_shift); 3073 } 3074 3075 /** 3076 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args 3077 * @oh: struct omap_hwmod * to test hardreset 3078 * @ohri: hardreset line data 3079 * 3080 * Call omap2_prm_is_hardreset_asserted() with parameters extracted 3081 * from the hwmod @oh and the hardreset line data @ohri. Only 3082 * intended for use as an soc_ops function pointer. Passes along the 3083 * return value from omap2_prm_is_hardreset_asserted(). XXX This 3084 * function is scheduled for removal when the PRM code is moved into 3085 * drivers/. 3086 */ 3087 static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh, 3088 struct omap_hwmod_rst_info *ohri) 3089 { 3090 return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs, 3091 ohri->st_shift); 3092 } 3093 3094 /** 3095 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args 3096 * @oh: struct omap_hwmod * to assert hardreset 3097 * @ohri: hardreset line data 3098 * 3099 * Call omap4_prminst_assert_hardreset() with parameters extracted 3100 * from the hwmod @oh and the hardreset line data @ohri. Only 3101 * intended for use as an soc_ops function pointer. Passes along the 3102 * return value from omap4_prminst_assert_hardreset(). XXX This 3103 * function is scheduled for removal when the PRM code is moved into 3104 * drivers/. 3105 */ 3106 static int _omap4_assert_hardreset(struct omap_hwmod *oh, 3107 struct omap_hwmod_rst_info *ohri) 3108 { 3109 if (!oh->clkdm) 3110 return -EINVAL; 3111 3112 return omap4_prminst_assert_hardreset(ohri->rst_shift, 3113 oh->clkdm->pwrdm.ptr->prcm_partition, 3114 oh->clkdm->pwrdm.ptr->prcm_offs, 3115 oh->prcm.omap4.rstctrl_offs); 3116 } 3117 3118 /** 3119 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args 3120 * @oh: struct omap_hwmod * to deassert hardreset 3121 * @ohri: hardreset line data 3122 * 3123 * Call omap4_prminst_deassert_hardreset() with parameters extracted 3124 * from the hwmod @oh and the hardreset line data @ohri. Only 3125 * intended for use as an soc_ops function pointer. Passes along the 3126 * return value from omap4_prminst_deassert_hardreset(). XXX This 3127 * function is scheduled for removal when the PRM code is moved into 3128 * drivers/. 3129 */ 3130 static int _omap4_deassert_hardreset(struct omap_hwmod *oh, 3131 struct omap_hwmod_rst_info *ohri) 3132 { 3133 if (!oh->clkdm) 3134 return -EINVAL; 3135 3136 if (ohri->st_shift) 3137 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n", 3138 oh->name, ohri->name); 3139 return omap4_prminst_deassert_hardreset(ohri->rst_shift, 3140 oh->clkdm->pwrdm.ptr->prcm_partition, 3141 oh->clkdm->pwrdm.ptr->prcm_offs, 3142 oh->prcm.omap4.rstctrl_offs); 3143 } 3144 3145 /** 3146 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args 3147 * @oh: struct omap_hwmod * to test hardreset 3148 * @ohri: hardreset line data 3149 * 3150 * Call omap4_prminst_is_hardreset_asserted() with parameters 3151 * extracted from the hwmod @oh and the hardreset line data @ohri. 3152 * Only intended for use as an soc_ops function pointer. Passes along 3153 * the return value from omap4_prminst_is_hardreset_asserted(). XXX 3154 * This function is scheduled for removal when the PRM code is moved 3155 * into drivers/. 3156 */ 3157 static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh, 3158 struct omap_hwmod_rst_info *ohri) 3159 { 3160 if (!oh->clkdm) 3161 return -EINVAL; 3162 3163 return omap4_prminst_is_hardreset_asserted(ohri->rst_shift, 3164 oh->clkdm->pwrdm.ptr->prcm_partition, 3165 oh->clkdm->pwrdm.ptr->prcm_offs, 3166 oh->prcm.omap4.rstctrl_offs); 3167 } 3168 3169 /** 3170 * _am33xx_assert_hardreset - call AM33XX PRM hardreset fn with hwmod args 3171 * @oh: struct omap_hwmod * to assert hardreset 3172 * @ohri: hardreset line data 3173 * 3174 * Call am33xx_prminst_assert_hardreset() with parameters extracted 3175 * from the hwmod @oh and the hardreset line data @ohri. Only 3176 * intended for use as an soc_ops function pointer. Passes along the 3177 * return value from am33xx_prminst_assert_hardreset(). XXX This 3178 * function is scheduled for removal when the PRM code is moved into 3179 * drivers/. 3180 */ 3181 static int _am33xx_assert_hardreset(struct omap_hwmod *oh, 3182 struct omap_hwmod_rst_info *ohri) 3183 3184 { 3185 return am33xx_prm_assert_hardreset(ohri->rst_shift, 3186 oh->clkdm->pwrdm.ptr->prcm_offs, 3187 oh->prcm.omap4.rstctrl_offs); 3188 } 3189 3190 /** 3191 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args 3192 * @oh: struct omap_hwmod * to deassert hardreset 3193 * @ohri: hardreset line data 3194 * 3195 * Call am33xx_prminst_deassert_hardreset() with parameters extracted 3196 * from the hwmod @oh and the hardreset line data @ohri. Only 3197 * intended for use as an soc_ops function pointer. Passes along the 3198 * return value from am33xx_prminst_deassert_hardreset(). XXX This 3199 * function is scheduled for removal when the PRM code is moved into 3200 * drivers/. 3201 */ 3202 static int _am33xx_deassert_hardreset(struct omap_hwmod *oh, 3203 struct omap_hwmod_rst_info *ohri) 3204 { 3205 return am33xx_prm_deassert_hardreset(ohri->rst_shift, 3206 ohri->st_shift, 3207 oh->clkdm->pwrdm.ptr->prcm_offs, 3208 oh->prcm.omap4.rstctrl_offs, 3209 oh->prcm.omap4.rstst_offs); 3210 } 3211 3212 /** 3213 * _am33xx_is_hardreset_asserted - call AM33XX PRM hardreset fn with hwmod args 3214 * @oh: struct omap_hwmod * to test hardreset 3215 * @ohri: hardreset line data 3216 * 3217 * Call am33xx_prminst_is_hardreset_asserted() with parameters 3218 * extracted from the hwmod @oh and the hardreset line data @ohri. 3219 * Only intended for use as an soc_ops function pointer. Passes along 3220 * the return value from am33xx_prminst_is_hardreset_asserted(). XXX 3221 * This function is scheduled for removal when the PRM code is moved 3222 * into drivers/. 3223 */ 3224 static int _am33xx_is_hardreset_asserted(struct omap_hwmod *oh, 3225 struct omap_hwmod_rst_info *ohri) 3226 { 3227 return am33xx_prm_is_hardreset_asserted(ohri->rst_shift, 3228 oh->clkdm->pwrdm.ptr->prcm_offs, 3229 oh->prcm.omap4.rstctrl_offs); 3230 } 3231 3232 /* Public functions */ 3233 3234 u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs) 3235 { 3236 if (oh->flags & HWMOD_16BIT_REG) 3237 return readw_relaxed(oh->_mpu_rt_va + reg_offs); 3238 else 3239 return readl_relaxed(oh->_mpu_rt_va + reg_offs); 3240 } 3241 3242 void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs) 3243 { 3244 if (oh->flags & HWMOD_16BIT_REG) 3245 writew_relaxed(v, oh->_mpu_rt_va + reg_offs); 3246 else 3247 writel_relaxed(v, oh->_mpu_rt_va + reg_offs); 3248 } 3249 3250 /** 3251 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit 3252 * @oh: struct omap_hwmod * 3253 * 3254 * This is a public function exposed to drivers. Some drivers may need to do 3255 * some settings before and after resetting the device. Those drivers after 3256 * doing the necessary settings could use this function to start a reset by 3257 * setting the SYSCONFIG.SOFTRESET bit. 3258 */ 3259 int omap_hwmod_softreset(struct omap_hwmod *oh) 3260 { 3261 u32 v; 3262 int ret; 3263 3264 if (!oh || !(oh->_sysc_cache)) 3265 return -EINVAL; 3266 3267 v = oh->_sysc_cache; 3268 ret = _set_softreset(oh, &v); 3269 if (ret) 3270 goto error; 3271 _write_sysconfig(v, oh); 3272 3273 ret = _clear_softreset(oh, &v); 3274 if (ret) 3275 goto error; 3276 _write_sysconfig(v, oh); 3277 3278 error: 3279 return ret; 3280 } 3281 3282 /** 3283 * omap_hwmod_lookup - look up a registered omap_hwmod by name 3284 * @name: name of the omap_hwmod to look up 3285 * 3286 * Given a @name of an omap_hwmod, return a pointer to the registered 3287 * struct omap_hwmod *, or NULL upon error. 3288 */ 3289 struct omap_hwmod *omap_hwmod_lookup(const char *name) 3290 { 3291 struct omap_hwmod *oh; 3292 3293 if (!name) 3294 return NULL; 3295 3296 oh = _lookup(name); 3297 3298 return oh; 3299 } 3300 3301 /** 3302 * omap_hwmod_for_each - call function for each registered omap_hwmod 3303 * @fn: pointer to a callback function 3304 * @data: void * data to pass to callback function 3305 * 3306 * Call @fn for each registered omap_hwmod, passing @data to each 3307 * function. @fn must return 0 for success or any other value for 3308 * failure. If @fn returns non-zero, the iteration across omap_hwmods 3309 * will stop and the non-zero return value will be passed to the 3310 * caller of omap_hwmod_for_each(). @fn is called with 3311 * omap_hwmod_for_each() held. 3312 */ 3313 int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data), 3314 void *data) 3315 { 3316 struct omap_hwmod *temp_oh; 3317 int ret = 0; 3318 3319 if (!fn) 3320 return -EINVAL; 3321 3322 list_for_each_entry(temp_oh, &omap_hwmod_list, node) { 3323 ret = (*fn)(temp_oh, data); 3324 if (ret) 3325 break; 3326 } 3327 3328 return ret; 3329 } 3330 3331 /** 3332 * omap_hwmod_register_links - register an array of hwmod links 3333 * @ois: pointer to an array of omap_hwmod_ocp_if to register 3334 * 3335 * Intended to be called early in boot before the clock framework is 3336 * initialized. If @ois is not null, will register all omap_hwmods 3337 * listed in @ois that are valid for this chip. Returns -EINVAL if 3338 * omap_hwmod_init() hasn't been called before calling this function, 3339 * -ENOMEM if the link memory area can't be allocated, or 0 upon 3340 * success. 3341 */ 3342 int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois) 3343 { 3344 int r, i; 3345 3346 if (!inited) 3347 return -EINVAL; 3348 3349 if (!ois) 3350 return 0; 3351 3352 if (ois[0] == NULL) /* Empty list */ 3353 return 0; 3354 3355 if (!linkspace) { 3356 if (_alloc_linkspace(ois)) { 3357 pr_err("omap_hwmod: could not allocate link space\n"); 3358 return -ENOMEM; 3359 } 3360 } 3361 3362 i = 0; 3363 do { 3364 r = _register_link(ois[i]); 3365 WARN(r && r != -EEXIST, 3366 "omap_hwmod: _register_link(%s -> %s) returned %d\n", 3367 ois[i]->master->name, ois[i]->slave->name, r); 3368 } while (ois[++i]); 3369 3370 return 0; 3371 } 3372 3373 /** 3374 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up 3375 * @oh: pointer to the hwmod currently being set up (usually not the MPU) 3376 * 3377 * If the hwmod data corresponding to the MPU subsystem IP block 3378 * hasn't been initialized and set up yet, do so now. This must be 3379 * done first since sleep dependencies may be added from other hwmods 3380 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No 3381 * return value. 3382 */ 3383 static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh) 3384 { 3385 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN) 3386 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n", 3387 __func__, MPU_INITIATOR_NAME); 3388 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh) 3389 omap_hwmod_setup_one(MPU_INITIATOR_NAME); 3390 } 3391 3392 /** 3393 * omap_hwmod_setup_one - set up a single hwmod 3394 * @oh_name: const char * name of the already-registered hwmod to set up 3395 * 3396 * Initialize and set up a single hwmod. Intended to be used for a 3397 * small number of early devices, such as the timer IP blocks used for 3398 * the scheduler clock. Must be called after omap2_clk_init(). 3399 * Resolves the struct clk names to struct clk pointers for each 3400 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns 3401 * -EINVAL upon error or 0 upon success. 3402 */ 3403 int __init omap_hwmod_setup_one(const char *oh_name) 3404 { 3405 struct omap_hwmod *oh; 3406 3407 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__); 3408 3409 oh = _lookup(oh_name); 3410 if (!oh) { 3411 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name); 3412 return -EINVAL; 3413 } 3414 3415 _ensure_mpu_hwmod_is_setup(oh); 3416 3417 _init(oh, NULL); 3418 _setup(oh, NULL); 3419 3420 return 0; 3421 } 3422 3423 /** 3424 * omap_hwmod_setup_all - set up all registered IP blocks 3425 * 3426 * Initialize and set up all IP blocks registered with the hwmod code. 3427 * Must be called after omap2_clk_init(). Resolves the struct clk 3428 * names to struct clk pointers for each registered omap_hwmod. Also 3429 * calls _setup() on each hwmod. Returns 0 upon success. 3430 */ 3431 static int __init omap_hwmod_setup_all(void) 3432 { 3433 _ensure_mpu_hwmod_is_setup(NULL); 3434 3435 omap_hwmod_for_each(_init, NULL); 3436 omap_hwmod_for_each(_setup, NULL); 3437 3438 return 0; 3439 } 3440 omap_core_initcall(omap_hwmod_setup_all); 3441 3442 /** 3443 * omap_hwmod_enable - enable an omap_hwmod 3444 * @oh: struct omap_hwmod * 3445 * 3446 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable(). 3447 * Returns -EINVAL on error or passes along the return value from _enable(). 3448 */ 3449 int omap_hwmod_enable(struct omap_hwmod *oh) 3450 { 3451 int r; 3452 unsigned long flags; 3453 3454 if (!oh) 3455 return -EINVAL; 3456 3457 spin_lock_irqsave(&oh->_lock, flags); 3458 r = _enable(oh); 3459 spin_unlock_irqrestore(&oh->_lock, flags); 3460 3461 return r; 3462 } 3463 3464 /** 3465 * omap_hwmod_idle - idle an omap_hwmod 3466 * @oh: struct omap_hwmod * 3467 * 3468 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle(). 3469 * Returns -EINVAL on error or passes along the return value from _idle(). 3470 */ 3471 int omap_hwmod_idle(struct omap_hwmod *oh) 3472 { 3473 unsigned long flags; 3474 3475 if (!oh) 3476 return -EINVAL; 3477 3478 spin_lock_irqsave(&oh->_lock, flags); 3479 _idle(oh); 3480 spin_unlock_irqrestore(&oh->_lock, flags); 3481 3482 return 0; 3483 } 3484 3485 /** 3486 * omap_hwmod_shutdown - shutdown an omap_hwmod 3487 * @oh: struct omap_hwmod * 3488 * 3489 * Shutdown an omap_hwmod @oh. Intended to be called by 3490 * omap_device_shutdown(). Returns -EINVAL on error or passes along 3491 * the return value from _shutdown(). 3492 */ 3493 int omap_hwmod_shutdown(struct omap_hwmod *oh) 3494 { 3495 unsigned long flags; 3496 3497 if (!oh) 3498 return -EINVAL; 3499 3500 spin_lock_irqsave(&oh->_lock, flags); 3501 _shutdown(oh); 3502 spin_unlock_irqrestore(&oh->_lock, flags); 3503 3504 return 0; 3505 } 3506 3507 /** 3508 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks 3509 * @oh: struct omap_hwmod *oh 3510 * 3511 * Intended to be called by the omap_device code. 3512 */ 3513 int omap_hwmod_enable_clocks(struct omap_hwmod *oh) 3514 { 3515 unsigned long flags; 3516 3517 spin_lock_irqsave(&oh->_lock, flags); 3518 _enable_clocks(oh); 3519 spin_unlock_irqrestore(&oh->_lock, flags); 3520 3521 return 0; 3522 } 3523 3524 /** 3525 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks 3526 * @oh: struct omap_hwmod *oh 3527 * 3528 * Intended to be called by the omap_device code. 3529 */ 3530 int omap_hwmod_disable_clocks(struct omap_hwmod *oh) 3531 { 3532 unsigned long flags; 3533 3534 spin_lock_irqsave(&oh->_lock, flags); 3535 _disable_clocks(oh); 3536 spin_unlock_irqrestore(&oh->_lock, flags); 3537 3538 return 0; 3539 } 3540 3541 /** 3542 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete 3543 * @oh: struct omap_hwmod *oh 3544 * 3545 * Intended to be called by drivers and core code when all posted 3546 * writes to a device must complete before continuing further 3547 * execution (for example, after clearing some device IRQSTATUS 3548 * register bits) 3549 * 3550 * XXX what about targets with multiple OCP threads? 3551 */ 3552 void omap_hwmod_ocp_barrier(struct omap_hwmod *oh) 3553 { 3554 BUG_ON(!oh); 3555 3556 if (!oh->class->sysc || !oh->class->sysc->sysc_flags) { 3557 WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n", 3558 oh->name); 3559 return; 3560 } 3561 3562 /* 3563 * Forces posted writes to complete on the OCP thread handling 3564 * register writes 3565 */ 3566 omap_hwmod_read(oh, oh->class->sysc->sysc_offs); 3567 } 3568 3569 /** 3570 * omap_hwmod_reset - reset the hwmod 3571 * @oh: struct omap_hwmod * 3572 * 3573 * Under some conditions, a driver may wish to reset the entire device. 3574 * Called from omap_device code. Returns -EINVAL on error or passes along 3575 * the return value from _reset(). 3576 */ 3577 int omap_hwmod_reset(struct omap_hwmod *oh) 3578 { 3579 int r; 3580 unsigned long flags; 3581 3582 if (!oh) 3583 return -EINVAL; 3584 3585 spin_lock_irqsave(&oh->_lock, flags); 3586 r = _reset(oh); 3587 spin_unlock_irqrestore(&oh->_lock, flags); 3588 3589 return r; 3590 } 3591 3592 /* 3593 * IP block data retrieval functions 3594 */ 3595 3596 /** 3597 * omap_hwmod_count_resources - count number of struct resources needed by hwmod 3598 * @oh: struct omap_hwmod * 3599 * @flags: Type of resources to include when counting (IRQ/DMA/MEM) 3600 * 3601 * Count the number of struct resource array elements necessary to 3602 * contain omap_hwmod @oh resources. Intended to be called by code 3603 * that registers omap_devices. Intended to be used to determine the 3604 * size of a dynamically-allocated struct resource array, before 3605 * calling omap_hwmod_fill_resources(). Returns the number of struct 3606 * resource array elements needed. 3607 * 3608 * XXX This code is not optimized. It could attempt to merge adjacent 3609 * resource IDs. 3610 * 3611 */ 3612 int omap_hwmod_count_resources(struct omap_hwmod *oh, unsigned long flags) 3613 { 3614 int ret = 0; 3615 3616 if (flags & IORESOURCE_IRQ) 3617 ret += _count_mpu_irqs(oh); 3618 3619 if (flags & IORESOURCE_DMA) 3620 ret += _count_sdma_reqs(oh); 3621 3622 if (flags & IORESOURCE_MEM) { 3623 int i = 0; 3624 struct omap_hwmod_ocp_if *os; 3625 struct list_head *p = oh->slave_ports.next; 3626 3627 while (i < oh->slaves_cnt) { 3628 os = _fetch_next_ocp_if(&p, &i); 3629 ret += _count_ocp_if_addr_spaces(os); 3630 } 3631 } 3632 3633 return ret; 3634 } 3635 3636 /** 3637 * omap_hwmod_fill_resources - fill struct resource array with hwmod data 3638 * @oh: struct omap_hwmod * 3639 * @res: pointer to the first element of an array of struct resource to fill 3640 * 3641 * Fill the struct resource array @res with resource data from the 3642 * omap_hwmod @oh. Intended to be called by code that registers 3643 * omap_devices. See also omap_hwmod_count_resources(). Returns the 3644 * number of array elements filled. 3645 */ 3646 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res) 3647 { 3648 struct omap_hwmod_ocp_if *os; 3649 struct list_head *p; 3650 int i, j, mpu_irqs_cnt, sdma_reqs_cnt, addr_cnt; 3651 int r = 0; 3652 3653 /* For each IRQ, DMA, memory area, fill in array.*/ 3654 3655 mpu_irqs_cnt = _count_mpu_irqs(oh); 3656 for (i = 0; i < mpu_irqs_cnt; i++) { 3657 (res + r)->name = (oh->mpu_irqs + i)->name; 3658 (res + r)->start = (oh->mpu_irqs + i)->irq; 3659 (res + r)->end = (oh->mpu_irqs + i)->irq; 3660 (res + r)->flags = IORESOURCE_IRQ; 3661 r++; 3662 } 3663 3664 sdma_reqs_cnt = _count_sdma_reqs(oh); 3665 for (i = 0; i < sdma_reqs_cnt; i++) { 3666 (res + r)->name = (oh->sdma_reqs + i)->name; 3667 (res + r)->start = (oh->sdma_reqs + i)->dma_req; 3668 (res + r)->end = (oh->sdma_reqs + i)->dma_req; 3669 (res + r)->flags = IORESOURCE_DMA; 3670 r++; 3671 } 3672 3673 p = oh->slave_ports.next; 3674 3675 i = 0; 3676 while (i < oh->slaves_cnt) { 3677 os = _fetch_next_ocp_if(&p, &i); 3678 addr_cnt = _count_ocp_if_addr_spaces(os); 3679 3680 for (j = 0; j < addr_cnt; j++) { 3681 (res + r)->name = (os->addr + j)->name; 3682 (res + r)->start = (os->addr + j)->pa_start; 3683 (res + r)->end = (os->addr + j)->pa_end; 3684 (res + r)->flags = IORESOURCE_MEM; 3685 r++; 3686 } 3687 } 3688 3689 return r; 3690 } 3691 3692 /** 3693 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data 3694 * @oh: struct omap_hwmod * 3695 * @res: pointer to the array of struct resource to fill 3696 * 3697 * Fill the struct resource array @res with dma resource data from the 3698 * omap_hwmod @oh. Intended to be called by code that registers 3699 * omap_devices. See also omap_hwmod_count_resources(). Returns the 3700 * number of array elements filled. 3701 */ 3702 int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res) 3703 { 3704 int i, sdma_reqs_cnt; 3705 int r = 0; 3706 3707 sdma_reqs_cnt = _count_sdma_reqs(oh); 3708 for (i = 0; i < sdma_reqs_cnt; i++) { 3709 (res + r)->name = (oh->sdma_reqs + i)->name; 3710 (res + r)->start = (oh->sdma_reqs + i)->dma_req; 3711 (res + r)->end = (oh->sdma_reqs + i)->dma_req; 3712 (res + r)->flags = IORESOURCE_DMA; 3713 r++; 3714 } 3715 3716 return r; 3717 } 3718 3719 /** 3720 * omap_hwmod_get_resource_byname - fetch IP block integration data by name 3721 * @oh: struct omap_hwmod * to operate on 3722 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h 3723 * @name: pointer to the name of the data to fetch (optional) 3724 * @rsrc: pointer to a struct resource, allocated by the caller 3725 * 3726 * Retrieve MPU IRQ, SDMA request line, or address space start/end 3727 * data for the IP block pointed to by @oh. The data will be filled 3728 * into a struct resource record pointed to by @rsrc. The struct 3729 * resource must be allocated by the caller. When @name is non-null, 3730 * the data associated with the matching entry in the IRQ/SDMA/address 3731 * space hwmod data arrays will be returned. If @name is null, the 3732 * first array entry will be returned. Data order is not meaningful 3733 * in hwmod data, so callers are strongly encouraged to use a non-null 3734 * @name whenever possible to avoid unpredictable effects if hwmod 3735 * data is later added that causes data ordering to change. This 3736 * function is only intended for use by OMAP core code. Device 3737 * drivers should not call this function - the appropriate bus-related 3738 * data accessor functions should be used instead. Returns 0 upon 3739 * success or a negative error code upon error. 3740 */ 3741 int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type, 3742 const char *name, struct resource *rsrc) 3743 { 3744 int r; 3745 unsigned int irq, dma; 3746 u32 pa_start, pa_end; 3747 3748 if (!oh || !rsrc) 3749 return -EINVAL; 3750 3751 if (type == IORESOURCE_IRQ) { 3752 r = _get_mpu_irq_by_name(oh, name, &irq); 3753 if (r) 3754 return r; 3755 3756 rsrc->start = irq; 3757 rsrc->end = irq; 3758 } else if (type == IORESOURCE_DMA) { 3759 r = _get_sdma_req_by_name(oh, name, &dma); 3760 if (r) 3761 return r; 3762 3763 rsrc->start = dma; 3764 rsrc->end = dma; 3765 } else if (type == IORESOURCE_MEM) { 3766 r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end); 3767 if (r) 3768 return r; 3769 3770 rsrc->start = pa_start; 3771 rsrc->end = pa_end; 3772 } else { 3773 return -EINVAL; 3774 } 3775 3776 rsrc->flags = type; 3777 rsrc->name = name; 3778 3779 return 0; 3780 } 3781 3782 /** 3783 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain 3784 * @oh: struct omap_hwmod * 3785 * 3786 * Return the powerdomain pointer associated with the OMAP module 3787 * @oh's main clock. If @oh does not have a main clk, return the 3788 * powerdomain associated with the interface clock associated with the 3789 * module's MPU port. (XXX Perhaps this should use the SDMA port 3790 * instead?) Returns NULL on error, or a struct powerdomain * on 3791 * success. 3792 */ 3793 struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh) 3794 { 3795 struct clk *c; 3796 struct omap_hwmod_ocp_if *oi; 3797 struct clockdomain *clkdm; 3798 struct clk_hw_omap *clk; 3799 3800 if (!oh) 3801 return NULL; 3802 3803 if (oh->clkdm) 3804 return oh->clkdm->pwrdm.ptr; 3805 3806 if (oh->_clk) { 3807 c = oh->_clk; 3808 } else { 3809 oi = _find_mpu_rt_port(oh); 3810 if (!oi) 3811 return NULL; 3812 c = oi->_clk; 3813 } 3814 3815 clk = to_clk_hw_omap(__clk_get_hw(c)); 3816 clkdm = clk->clkdm; 3817 if (!clkdm) 3818 return NULL; 3819 3820 return clkdm->pwrdm.ptr; 3821 } 3822 3823 /** 3824 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU) 3825 * @oh: struct omap_hwmod * 3826 * 3827 * Returns the virtual address corresponding to the beginning of the 3828 * module's register target, in the address range that is intended to 3829 * be used by the MPU. Returns the virtual address upon success or NULL 3830 * upon error. 3831 */ 3832 void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh) 3833 { 3834 if (!oh) 3835 return NULL; 3836 3837 if (oh->_int_flags & _HWMOD_NO_MPU_PORT) 3838 return NULL; 3839 3840 if (oh->_state == _HWMOD_STATE_UNKNOWN) 3841 return NULL; 3842 3843 return oh->_mpu_rt_va; 3844 } 3845 3846 /** 3847 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh 3848 * @oh: struct omap_hwmod * 3849 * @init_oh: struct omap_hwmod * (initiator) 3850 * 3851 * Add a sleep dependency between the initiator @init_oh and @oh. 3852 * Intended to be called by DSP/Bridge code via platform_data for the 3853 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge 3854 * code needs to add/del initiator dependencies dynamically 3855 * before/after accessing a device. Returns the return value from 3856 * _add_initiator_dep(). 3857 * 3858 * XXX Keep a usecount in the clockdomain code 3859 */ 3860 int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh, 3861 struct omap_hwmod *init_oh) 3862 { 3863 return _add_initiator_dep(oh, init_oh); 3864 } 3865 3866 /* 3867 * XXX what about functions for drivers to save/restore ocp_sysconfig 3868 * for context save/restore operations? 3869 */ 3870 3871 /** 3872 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh 3873 * @oh: struct omap_hwmod * 3874 * @init_oh: struct omap_hwmod * (initiator) 3875 * 3876 * Remove a sleep dependency between the initiator @init_oh and @oh. 3877 * Intended to be called by DSP/Bridge code via platform_data for the 3878 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge 3879 * code needs to add/del initiator dependencies dynamically 3880 * before/after accessing a device. Returns the return value from 3881 * _del_initiator_dep(). 3882 * 3883 * XXX Keep a usecount in the clockdomain code 3884 */ 3885 int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh, 3886 struct omap_hwmod *init_oh) 3887 { 3888 return _del_initiator_dep(oh, init_oh); 3889 } 3890 3891 /** 3892 * omap_hwmod_enable_wakeup - allow device to wake up the system 3893 * @oh: struct omap_hwmod * 3894 * 3895 * Sets the module OCP socket ENAWAKEUP bit to allow the module to 3896 * send wakeups to the PRCM, and enable I/O ring wakeup events for 3897 * this IP block if it has dynamic mux entries. Eventually this 3898 * should set PRCM wakeup registers to cause the PRCM to receive 3899 * wakeup events from the module. Does not set any wakeup routing 3900 * registers beyond this point - if the module is to wake up any other 3901 * module or subsystem, that must be set separately. Called by 3902 * omap_device code. Returns -EINVAL on error or 0 upon success. 3903 */ 3904 int omap_hwmod_enable_wakeup(struct omap_hwmod *oh) 3905 { 3906 unsigned long flags; 3907 u32 v; 3908 3909 spin_lock_irqsave(&oh->_lock, flags); 3910 3911 if (oh->class->sysc && 3912 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) { 3913 v = oh->_sysc_cache; 3914 _enable_wakeup(oh, &v); 3915 _write_sysconfig(v, oh); 3916 } 3917 3918 _set_idle_ioring_wakeup(oh, true); 3919 spin_unlock_irqrestore(&oh->_lock, flags); 3920 3921 return 0; 3922 } 3923 3924 /** 3925 * omap_hwmod_disable_wakeup - prevent device from waking the system 3926 * @oh: struct omap_hwmod * 3927 * 3928 * Clears the module OCP socket ENAWAKEUP bit to prevent the module 3929 * from sending wakeups to the PRCM, and disable I/O ring wakeup 3930 * events for this IP block if it has dynamic mux entries. Eventually 3931 * this should clear PRCM wakeup registers to cause the PRCM to ignore 3932 * wakeup events from the module. Does not set any wakeup routing 3933 * registers beyond this point - if the module is to wake up any other 3934 * module or subsystem, that must be set separately. Called by 3935 * omap_device code. Returns -EINVAL on error or 0 upon success. 3936 */ 3937 int omap_hwmod_disable_wakeup(struct omap_hwmod *oh) 3938 { 3939 unsigned long flags; 3940 u32 v; 3941 3942 spin_lock_irqsave(&oh->_lock, flags); 3943 3944 if (oh->class->sysc && 3945 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) { 3946 v = oh->_sysc_cache; 3947 _disable_wakeup(oh, &v); 3948 _write_sysconfig(v, oh); 3949 } 3950 3951 _set_idle_ioring_wakeup(oh, false); 3952 spin_unlock_irqrestore(&oh->_lock, flags); 3953 3954 return 0; 3955 } 3956 3957 /** 3958 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules 3959 * contained in the hwmod module. 3960 * @oh: struct omap_hwmod * 3961 * @name: name of the reset line to lookup and assert 3962 * 3963 * Some IP like dsp, ipu or iva contain processor that require 3964 * an HW reset line to be assert / deassert in order to enable fully 3965 * the IP. Returns -EINVAL if @oh is null or if the operation is not 3966 * yet supported on this OMAP; otherwise, passes along the return value 3967 * from _assert_hardreset(). 3968 */ 3969 int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name) 3970 { 3971 int ret; 3972 unsigned long flags; 3973 3974 if (!oh) 3975 return -EINVAL; 3976 3977 spin_lock_irqsave(&oh->_lock, flags); 3978 ret = _assert_hardreset(oh, name); 3979 spin_unlock_irqrestore(&oh->_lock, flags); 3980 3981 return ret; 3982 } 3983 3984 /** 3985 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules 3986 * contained in the hwmod module. 3987 * @oh: struct omap_hwmod * 3988 * @name: name of the reset line to look up and deassert 3989 * 3990 * Some IP like dsp, ipu or iva contain processor that require 3991 * an HW reset line to be assert / deassert in order to enable fully 3992 * the IP. Returns -EINVAL if @oh is null or if the operation is not 3993 * yet supported on this OMAP; otherwise, passes along the return value 3994 * from _deassert_hardreset(). 3995 */ 3996 int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name) 3997 { 3998 int ret; 3999 unsigned long flags; 4000 4001 if (!oh) 4002 return -EINVAL; 4003 4004 spin_lock_irqsave(&oh->_lock, flags); 4005 ret = _deassert_hardreset(oh, name); 4006 spin_unlock_irqrestore(&oh->_lock, flags); 4007 4008 return ret; 4009 } 4010 4011 /** 4012 * omap_hwmod_read_hardreset - read the HW reset line state of submodules 4013 * contained in the hwmod module 4014 * @oh: struct omap_hwmod * 4015 * @name: name of the reset line to look up and read 4016 * 4017 * Return the current state of the hwmod @oh's reset line named @name: 4018 * returns -EINVAL upon parameter error or if this operation 4019 * is unsupported on the current OMAP; otherwise, passes along the return 4020 * value from _read_hardreset(). 4021 */ 4022 int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name) 4023 { 4024 int ret; 4025 unsigned long flags; 4026 4027 if (!oh) 4028 return -EINVAL; 4029 4030 spin_lock_irqsave(&oh->_lock, flags); 4031 ret = _read_hardreset(oh, name); 4032 spin_unlock_irqrestore(&oh->_lock, flags); 4033 4034 return ret; 4035 } 4036 4037 4038 /** 4039 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname 4040 * @classname: struct omap_hwmod_class name to search for 4041 * @fn: callback function pointer to call for each hwmod in class @classname 4042 * @user: arbitrary context data to pass to the callback function 4043 * 4044 * For each omap_hwmod of class @classname, call @fn. 4045 * If the callback function returns something other than 4046 * zero, the iterator is terminated, and the callback function's return 4047 * value is passed back to the caller. Returns 0 upon success, -EINVAL 4048 * if @classname or @fn are NULL, or passes back the error code from @fn. 4049 */ 4050 int omap_hwmod_for_each_by_class(const char *classname, 4051 int (*fn)(struct omap_hwmod *oh, 4052 void *user), 4053 void *user) 4054 { 4055 struct omap_hwmod *temp_oh; 4056 int ret = 0; 4057 4058 if (!classname || !fn) 4059 return -EINVAL; 4060 4061 pr_debug("omap_hwmod: %s: looking for modules of class %s\n", 4062 __func__, classname); 4063 4064 list_for_each_entry(temp_oh, &omap_hwmod_list, node) { 4065 if (!strcmp(temp_oh->class->name, classname)) { 4066 pr_debug("omap_hwmod: %s: %s: calling callback fn\n", 4067 __func__, temp_oh->name); 4068 ret = (*fn)(temp_oh, user); 4069 if (ret) 4070 break; 4071 } 4072 } 4073 4074 if (ret) 4075 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n", 4076 __func__, ret); 4077 4078 return ret; 4079 } 4080 4081 /** 4082 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod 4083 * @oh: struct omap_hwmod * 4084 * @state: state that _setup() should leave the hwmod in 4085 * 4086 * Sets the hwmod state that @oh will enter at the end of _setup() 4087 * (called by omap_hwmod_setup_*()). See also the documentation 4088 * for _setup_postsetup(), above. Returns 0 upon success or 4089 * -EINVAL if there is a problem with the arguments or if the hwmod is 4090 * in the wrong state. 4091 */ 4092 int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state) 4093 { 4094 int ret; 4095 unsigned long flags; 4096 4097 if (!oh) 4098 return -EINVAL; 4099 4100 if (state != _HWMOD_STATE_DISABLED && 4101 state != _HWMOD_STATE_ENABLED && 4102 state != _HWMOD_STATE_IDLE) 4103 return -EINVAL; 4104 4105 spin_lock_irqsave(&oh->_lock, flags); 4106 4107 if (oh->_state != _HWMOD_STATE_REGISTERED) { 4108 ret = -EINVAL; 4109 goto ohsps_unlock; 4110 } 4111 4112 oh->_postsetup_state = state; 4113 ret = 0; 4114 4115 ohsps_unlock: 4116 spin_unlock_irqrestore(&oh->_lock, flags); 4117 4118 return ret; 4119 } 4120 4121 /** 4122 * omap_hwmod_get_context_loss_count - get lost context count 4123 * @oh: struct omap_hwmod * 4124 * 4125 * Returns the context loss count of associated @oh 4126 * upon success, or zero if no context loss data is available. 4127 * 4128 * On OMAP4, this queries the per-hwmod context loss register, 4129 * assuming one exists. If not, or on OMAP2/3, this queries the 4130 * enclosing powerdomain context loss count. 4131 */ 4132 int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh) 4133 { 4134 struct powerdomain *pwrdm; 4135 int ret = 0; 4136 4137 if (soc_ops.get_context_lost) 4138 return soc_ops.get_context_lost(oh); 4139 4140 pwrdm = omap_hwmod_get_pwrdm(oh); 4141 if (pwrdm) 4142 ret = pwrdm_get_context_loss_count(pwrdm); 4143 4144 return ret; 4145 } 4146 4147 /** 4148 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup 4149 * @oh: struct omap_hwmod * 4150 * 4151 * Prevent the hwmod @oh from being reset during the setup process. 4152 * Intended for use by board-*.c files on boards with devices that 4153 * cannot tolerate being reset. Must be called before the hwmod has 4154 * been set up. Returns 0 upon success or negative error code upon 4155 * failure. 4156 */ 4157 int omap_hwmod_no_setup_reset(struct omap_hwmod *oh) 4158 { 4159 if (!oh) 4160 return -EINVAL; 4161 4162 if (oh->_state != _HWMOD_STATE_REGISTERED) { 4163 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n", 4164 oh->name); 4165 return -EINVAL; 4166 } 4167 4168 oh->flags |= HWMOD_INIT_NO_RESET; 4169 4170 return 0; 4171 } 4172 4173 /** 4174 * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ 4175 * @oh: struct omap_hwmod * containing hwmod mux entries 4176 * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup 4177 * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup 4178 * 4179 * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux 4180 * entry number @pad_idx for the hwmod @oh, trigger the interrupt 4181 * service routine for the hwmod's mpu_irqs array index @irq_idx. If 4182 * this function is not called for a given pad_idx, then the ISR 4183 * associated with @oh's first MPU IRQ will be triggered when an I/O 4184 * pad wakeup occurs on that pad. Note that @pad_idx is the index of 4185 * the _dynamic or wakeup_ entry: if there are other entries not 4186 * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these 4187 * entries are NOT COUNTED in the dynamic pad index. This function 4188 * must be called separately for each pad that requires its interrupt 4189 * to be re-routed this way. Returns -EINVAL if there is an argument 4190 * problem or if @oh does not have hwmod mux entries or MPU IRQs; 4191 * returns -ENOMEM if memory cannot be allocated; or 0 upon success. 4192 * 4193 * XXX This function interface is fragile. Rather than using array 4194 * indexes, which are subject to unpredictable change, it should be 4195 * using hwmod IRQ names, and some other stable key for the hwmod mux 4196 * pad records. 4197 */ 4198 int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx) 4199 { 4200 int nr_irqs; 4201 4202 might_sleep(); 4203 4204 if (!oh || !oh->mux || !oh->mpu_irqs || pad_idx < 0 || 4205 pad_idx >= oh->mux->nr_pads_dynamic) 4206 return -EINVAL; 4207 4208 /* Check the number of available mpu_irqs */ 4209 for (nr_irqs = 0; oh->mpu_irqs[nr_irqs].irq >= 0; nr_irqs++) 4210 ; 4211 4212 if (irq_idx >= nr_irqs) 4213 return -EINVAL; 4214 4215 if (!oh->mux->irqs) { 4216 /* XXX What frees this? */ 4217 oh->mux->irqs = kzalloc(sizeof(int) * oh->mux->nr_pads_dynamic, 4218 GFP_KERNEL); 4219 if (!oh->mux->irqs) 4220 return -ENOMEM; 4221 } 4222 oh->mux->irqs[pad_idx] = irq_idx; 4223 4224 return 0; 4225 } 4226 4227 /** 4228 * omap_hwmod_init - initialize the hwmod code 4229 * 4230 * Sets up some function pointers needed by the hwmod code to operate on the 4231 * currently-booted SoC. Intended to be called once during kernel init 4232 * before any hwmods are registered. No return value. 4233 */ 4234 void __init omap_hwmod_init(void) 4235 { 4236 if (cpu_is_omap24xx()) { 4237 soc_ops.wait_target_ready = _omap2xxx_wait_target_ready; 4238 soc_ops.assert_hardreset = _omap2_assert_hardreset; 4239 soc_ops.deassert_hardreset = _omap2_deassert_hardreset; 4240 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted; 4241 } else if (cpu_is_omap34xx()) { 4242 soc_ops.wait_target_ready = _omap3xxx_wait_target_ready; 4243 soc_ops.assert_hardreset = _omap2_assert_hardreset; 4244 soc_ops.deassert_hardreset = _omap2_deassert_hardreset; 4245 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted; 4246 soc_ops.init_clkdm = _init_clkdm; 4247 } else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) { 4248 soc_ops.enable_module = _omap4_enable_module; 4249 soc_ops.disable_module = _omap4_disable_module; 4250 soc_ops.wait_target_ready = _omap4_wait_target_ready; 4251 soc_ops.assert_hardreset = _omap4_assert_hardreset; 4252 soc_ops.deassert_hardreset = _omap4_deassert_hardreset; 4253 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted; 4254 soc_ops.init_clkdm = _init_clkdm; 4255 soc_ops.update_context_lost = _omap4_update_context_lost; 4256 soc_ops.get_context_lost = _omap4_get_context_lost; 4257 } else if (soc_is_am43xx()) { 4258 soc_ops.enable_module = _omap4_enable_module; 4259 soc_ops.disable_module = _omap4_disable_module; 4260 soc_ops.wait_target_ready = _omap4_wait_target_ready; 4261 soc_ops.assert_hardreset = _am33xx_assert_hardreset; 4262 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset; 4263 soc_ops.is_hardreset_asserted = _am33xx_is_hardreset_asserted; 4264 soc_ops.init_clkdm = _init_clkdm; 4265 } else if (soc_is_am33xx()) { 4266 soc_ops.enable_module = _am33xx_enable_module; 4267 soc_ops.disable_module = _am33xx_disable_module; 4268 soc_ops.wait_target_ready = _am33xx_wait_target_ready; 4269 soc_ops.assert_hardreset = _am33xx_assert_hardreset; 4270 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset; 4271 soc_ops.is_hardreset_asserted = _am33xx_is_hardreset_asserted; 4272 soc_ops.init_clkdm = _init_clkdm; 4273 } else { 4274 WARN(1, "omap_hwmod: unknown SoC type\n"); 4275 } 4276 4277 inited = true; 4278 } 4279 4280 /** 4281 * omap_hwmod_get_main_clk - get pointer to main clock name 4282 * @oh: struct omap_hwmod * 4283 * 4284 * Returns the main clock name assocated with @oh upon success, 4285 * or NULL if @oh is NULL. 4286 */ 4287 const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh) 4288 { 4289 if (!oh) 4290 return NULL; 4291 4292 return oh->main_clk; 4293 } 4294