1 /* 2 * OMAP3 Power Management Routines 3 * 4 * Copyright (C) 2006-2008 Nokia Corporation 5 * Tony Lindgren <tony@atomide.com> 6 * Jouni Hogander 7 * 8 * Copyright (C) 2007 Texas Instruments, Inc. 9 * Rajendra Nayak <rnayak@ti.com> 10 * 11 * Copyright (C) 2005 Texas Instruments, Inc. 12 * Richard Woodruff <r-woodruff2@ti.com> 13 * 14 * Based on pm.c for omap1 15 * 16 * This program is free software; you can redistribute it and/or modify 17 * it under the terms of the GNU General Public License version 2 as 18 * published by the Free Software Foundation. 19 */ 20 21 #include <linux/pm.h> 22 #include <linux/suspend.h> 23 #include <linux/interrupt.h> 24 #include <linux/module.h> 25 #include <linux/list.h> 26 #include <linux/err.h> 27 #include <linux/gpio.h> 28 #include <linux/clk.h> 29 #include <linux/delay.h> 30 #include <linux/slab.h> 31 #include <linux/omap-dma.h> 32 #include <linux/omap-gpmc.h> 33 #include <linux/platform_data/gpio-omap.h> 34 35 #include <trace/events/power.h> 36 37 #include <asm/fncpy.h> 38 #include <asm/suspend.h> 39 #include <asm/system_misc.h> 40 41 #include "clockdomain.h" 42 #include "powerdomain.h" 43 #include "soc.h" 44 #include "common.h" 45 #include "cm3xxx.h" 46 #include "cm-regbits-34xx.h" 47 #include "prm-regbits-34xx.h" 48 #include "prm3xxx.h" 49 #include "pm.h" 50 #include "sdrc.h" 51 #include "sram.h" 52 #include "control.h" 53 #include "vc.h" 54 55 /* pm34xx errata defined in pm.h */ 56 u16 pm34xx_errata; 57 58 struct power_state { 59 struct powerdomain *pwrdm; 60 u32 next_state; 61 #ifdef CONFIG_SUSPEND 62 u32 saved_state; 63 #endif 64 struct list_head node; 65 }; 66 67 static LIST_HEAD(pwrst_list); 68 69 static int (*_omap_save_secure_sram)(u32 *addr); 70 void (*omap3_do_wfi_sram)(void); 71 72 static struct powerdomain *mpu_pwrdm, *neon_pwrdm; 73 static struct powerdomain *core_pwrdm, *per_pwrdm; 74 75 static void omap3_core_save_context(void) 76 { 77 omap3_ctrl_save_padconf(); 78 79 /* 80 * Force write last pad into memory, as this can fail in some 81 * cases according to errata 1.157, 1.185 82 */ 83 omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14), 84 OMAP343X_CONTROL_MEM_WKUP + 0x2a0); 85 86 /* Save the Interrupt controller context */ 87 omap_intc_save_context(); 88 /* Save the GPMC context */ 89 omap3_gpmc_save_context(); 90 /* Save the system control module context, padconf already save above*/ 91 omap3_control_save_context(); 92 omap_dma_global_context_save(); 93 } 94 95 static void omap3_core_restore_context(void) 96 { 97 /* Restore the control module context, padconf restored by h/w */ 98 omap3_control_restore_context(); 99 /* Restore the GPMC context */ 100 omap3_gpmc_restore_context(); 101 /* Restore the interrupt controller context */ 102 omap_intc_restore_context(); 103 omap_dma_global_context_restore(); 104 } 105 106 /* 107 * FIXME: This function should be called before entering off-mode after 108 * OMAP3 secure services have been accessed. Currently it is only called 109 * once during boot sequence, but this works as we are not using secure 110 * services. 111 */ 112 static void omap3_save_secure_ram_context(void) 113 { 114 u32 ret; 115 int mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm); 116 117 if (omap_type() != OMAP2_DEVICE_TYPE_GP) { 118 /* 119 * MPU next state must be set to POWER_ON temporarily, 120 * otherwise the WFI executed inside the ROM code 121 * will hang the system. 122 */ 123 pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON); 124 ret = _omap_save_secure_sram((u32 *)(unsigned long) 125 __pa(omap3_secure_ram_storage)); 126 pwrdm_set_next_pwrst(mpu_pwrdm, mpu_next_state); 127 /* Following is for error tracking, it should not happen */ 128 if (ret) { 129 pr_err("save_secure_sram() returns %08x\n", ret); 130 while (1) 131 ; 132 } 133 } 134 } 135 136 static irqreturn_t _prcm_int_handle_io(int irq, void *unused) 137 { 138 int c; 139 140 c = omap_prm_clear_mod_irqs(WKUP_MOD, 1, OMAP3430_ST_IO_MASK | 141 OMAP3430_ST_IO_CHAIN_MASK); 142 143 return c ? IRQ_HANDLED : IRQ_NONE; 144 } 145 146 static irqreturn_t _prcm_int_handle_wakeup(int irq, void *unused) 147 { 148 int c; 149 150 /* 151 * Clear all except ST_IO and ST_IO_CHAIN for wkup module, 152 * these are handled in a separate handler to avoid acking 153 * IO events before parsing in mux code 154 */ 155 c = omap_prm_clear_mod_irqs(WKUP_MOD, 1, ~(OMAP3430_ST_IO_MASK | 156 OMAP3430_ST_IO_CHAIN_MASK)); 157 c += omap_prm_clear_mod_irqs(CORE_MOD, 1, ~0); 158 c += omap_prm_clear_mod_irqs(OMAP3430_PER_MOD, 1, ~0); 159 if (omap_rev() > OMAP3430_REV_ES1_0) { 160 c += omap_prm_clear_mod_irqs(CORE_MOD, 3, ~0); 161 c += omap_prm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1, ~0); 162 } 163 164 return c ? IRQ_HANDLED : IRQ_NONE; 165 } 166 167 static void omap34xx_save_context(u32 *save) 168 { 169 u32 val; 170 171 /* Read Auxiliary Control Register */ 172 asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (val)); 173 *save++ = 1; 174 *save++ = val; 175 176 /* Read L2 AUX ctrl register */ 177 asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (val)); 178 *save++ = 1; 179 *save++ = val; 180 } 181 182 static int omap34xx_do_sram_idle(unsigned long save_state) 183 { 184 omap34xx_cpu_suspend(save_state); 185 return 0; 186 } 187 188 void omap_sram_idle(void) 189 { 190 /* Variable to tell what needs to be saved and restored 191 * in omap_sram_idle*/ 192 /* save_state = 0 => Nothing to save and restored */ 193 /* save_state = 1 => Only L1 and logic lost */ 194 /* save_state = 2 => Only L2 lost */ 195 /* save_state = 3 => L1, L2 and logic lost */ 196 int save_state = 0; 197 int mpu_next_state = PWRDM_POWER_ON; 198 int per_next_state = PWRDM_POWER_ON; 199 int core_next_state = PWRDM_POWER_ON; 200 int per_going_off; 201 u32 sdrc_pwr = 0; 202 203 mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm); 204 switch (mpu_next_state) { 205 case PWRDM_POWER_ON: 206 case PWRDM_POWER_RET: 207 /* No need to save context */ 208 save_state = 0; 209 break; 210 case PWRDM_POWER_OFF: 211 save_state = 3; 212 break; 213 default: 214 /* Invalid state */ 215 pr_err("Invalid mpu state in sram_idle\n"); 216 return; 217 } 218 219 /* NEON control */ 220 if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON) 221 pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state); 222 223 /* Enable IO-PAD and IO-CHAIN wakeups */ 224 per_next_state = pwrdm_read_next_pwrst(per_pwrdm); 225 core_next_state = pwrdm_read_next_pwrst(core_pwrdm); 226 227 pwrdm_pre_transition(NULL); 228 229 /* PER */ 230 if (per_next_state < PWRDM_POWER_ON) { 231 per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0; 232 omap2_gpio_prepare_for_idle(per_going_off); 233 } 234 235 /* CORE */ 236 if (core_next_state < PWRDM_POWER_ON) { 237 if (core_next_state == PWRDM_POWER_OFF) { 238 omap3_core_save_context(); 239 omap3_cm_save_context(); 240 } 241 } 242 243 /* Configure PMIC signaling for I2C4 or sys_off_mode */ 244 omap3_vc_set_pmic_signaling(core_next_state); 245 246 omap3_intc_prepare_idle(); 247 248 /* 249 * On EMU/HS devices ROM code restores a SRDC value 250 * from scratchpad which has automatic self refresh on timeout 251 * of AUTO_CNT = 1 enabled. This takes care of erratum ID i443. 252 * Hence store/restore the SDRC_POWER register here. 253 */ 254 if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 && 255 (omap_type() == OMAP2_DEVICE_TYPE_EMU || 256 omap_type() == OMAP2_DEVICE_TYPE_SEC) && 257 core_next_state == PWRDM_POWER_OFF) 258 sdrc_pwr = sdrc_read_reg(SDRC_POWER); 259 260 /* 261 * omap3_arm_context is the location where some ARM context 262 * get saved. The rest is placed on the stack, and restored 263 * from there before resuming. 264 */ 265 if (save_state) 266 omap34xx_save_context(omap3_arm_context); 267 if (save_state == 1 || save_state == 3) 268 cpu_suspend(save_state, omap34xx_do_sram_idle); 269 else 270 omap34xx_do_sram_idle(save_state); 271 272 /* Restore normal SDRC POWER settings */ 273 if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 && 274 (omap_type() == OMAP2_DEVICE_TYPE_EMU || 275 omap_type() == OMAP2_DEVICE_TYPE_SEC) && 276 core_next_state == PWRDM_POWER_OFF) 277 sdrc_write_reg(sdrc_pwr, SDRC_POWER); 278 279 /* CORE */ 280 if (core_next_state < PWRDM_POWER_ON && 281 pwrdm_read_prev_pwrst(core_pwrdm) == PWRDM_POWER_OFF) { 282 omap3_core_restore_context(); 283 omap3_cm_restore_context(); 284 omap3_sram_restore_context(); 285 omap2_sms_restore_context(); 286 } else { 287 /* 288 * In off-mode resume path above, omap3_core_restore_context 289 * also handles the INTC autoidle restore done here so limit 290 * this to non-off mode resume paths so we don't do it twice. 291 */ 292 omap3_intc_resume_idle(); 293 } 294 295 pwrdm_post_transition(NULL); 296 297 /* PER */ 298 if (per_next_state < PWRDM_POWER_ON) 299 omap2_gpio_resume_after_idle(); 300 } 301 302 static void omap3_pm_idle(void) 303 { 304 if (omap_irq_pending()) 305 return; 306 307 trace_cpu_idle_rcuidle(1, smp_processor_id()); 308 309 omap_sram_idle(); 310 311 trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id()); 312 } 313 314 #ifdef CONFIG_SUSPEND 315 static int omap3_pm_suspend(void) 316 { 317 struct power_state *pwrst; 318 int state, ret = 0; 319 320 /* Read current next_pwrsts */ 321 list_for_each_entry(pwrst, &pwrst_list, node) 322 pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm); 323 /* Set ones wanted by suspend */ 324 list_for_each_entry(pwrst, &pwrst_list, node) { 325 if (omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state)) 326 goto restore; 327 if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm)) 328 goto restore; 329 } 330 331 omap3_intc_suspend(); 332 333 omap_sram_idle(); 334 335 restore: 336 /* Restore next_pwrsts */ 337 list_for_each_entry(pwrst, &pwrst_list, node) { 338 state = pwrdm_read_prev_pwrst(pwrst->pwrdm); 339 if (state > pwrst->next_state) { 340 pr_info("Powerdomain (%s) didn't enter target state %d\n", 341 pwrst->pwrdm->name, pwrst->next_state); 342 ret = -1; 343 } 344 omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state); 345 } 346 if (ret) 347 pr_err("Could not enter target state in pm_suspend\n"); 348 else 349 pr_info("Successfully put all powerdomains to target state\n"); 350 351 return ret; 352 } 353 #else 354 #define omap3_pm_suspend NULL 355 #endif /* CONFIG_SUSPEND */ 356 357 static void __init prcm_setup_regs(void) 358 { 359 omap3_ctrl_init(); 360 361 omap3_prm_init_pm(cpu_is_omap3630(), omap3_has_iva()); 362 } 363 364 void omap3_pm_off_mode_enable(int enable) 365 { 366 struct power_state *pwrst; 367 u32 state; 368 369 if (enable) 370 state = PWRDM_POWER_OFF; 371 else 372 state = PWRDM_POWER_RET; 373 374 list_for_each_entry(pwrst, &pwrst_list, node) { 375 if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583) && 376 pwrst->pwrdm == core_pwrdm && 377 state == PWRDM_POWER_OFF) { 378 pwrst->next_state = PWRDM_POWER_RET; 379 pr_warn("%s: Core OFF disabled due to errata i583\n", 380 __func__); 381 } else { 382 pwrst->next_state = state; 383 } 384 omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state); 385 } 386 } 387 388 int omap3_pm_get_suspend_state(struct powerdomain *pwrdm) 389 { 390 struct power_state *pwrst; 391 392 list_for_each_entry(pwrst, &pwrst_list, node) { 393 if (pwrst->pwrdm == pwrdm) 394 return pwrst->next_state; 395 } 396 return -EINVAL; 397 } 398 399 int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state) 400 { 401 struct power_state *pwrst; 402 403 list_for_each_entry(pwrst, &pwrst_list, node) { 404 if (pwrst->pwrdm == pwrdm) { 405 pwrst->next_state = state; 406 return 0; 407 } 408 } 409 return -EINVAL; 410 } 411 412 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused) 413 { 414 struct power_state *pwrst; 415 416 if (!pwrdm->pwrsts) 417 return 0; 418 419 pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC); 420 if (!pwrst) 421 return -ENOMEM; 422 pwrst->pwrdm = pwrdm; 423 pwrst->next_state = PWRDM_POWER_RET; 424 list_add(&pwrst->node, &pwrst_list); 425 426 if (pwrdm_has_hdwr_sar(pwrdm)) 427 pwrdm_enable_hdwr_sar(pwrdm); 428 429 return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state); 430 } 431 432 /* 433 * Push functions to SRAM 434 * 435 * The minimum set of functions is pushed to SRAM for execution: 436 * - omap3_do_wfi for erratum i581 WA, 437 * - save_secure_ram_context for security extensions. 438 */ 439 void omap_push_sram_idle(void) 440 { 441 omap3_do_wfi_sram = omap_sram_push(omap3_do_wfi, omap3_do_wfi_sz); 442 443 if (omap_type() != OMAP2_DEVICE_TYPE_GP) 444 _omap_save_secure_sram = omap_sram_push(save_secure_ram_context, 445 save_secure_ram_context_sz); 446 } 447 448 static void __init pm_errata_configure(void) 449 { 450 if (cpu_is_omap3630()) { 451 pm34xx_errata |= PM_RTA_ERRATUM_i608; 452 /* Enable the l2 cache toggling in sleep logic */ 453 enable_omap3630_toggle_l2_on_restore(); 454 if (omap_rev() < OMAP3630_REV_ES1_2) 455 pm34xx_errata |= (PM_SDRC_WAKEUP_ERRATUM_i583 | 456 PM_PER_MEMORIES_ERRATUM_i582); 457 } else if (cpu_is_omap34xx()) { 458 pm34xx_errata |= PM_PER_MEMORIES_ERRATUM_i582; 459 } 460 } 461 462 int __init omap3_pm_init(void) 463 { 464 struct power_state *pwrst, *tmp; 465 struct clockdomain *neon_clkdm, *mpu_clkdm, *per_clkdm, *wkup_clkdm; 466 int ret; 467 468 if (!omap3_has_io_chain_ctrl()) 469 pr_warn("PM: no software I/O chain control; some wakeups may be lost\n"); 470 471 pm_errata_configure(); 472 473 /* XXX prcm_setup_regs needs to be before enabling hw 474 * supervised mode for powerdomains */ 475 prcm_setup_regs(); 476 477 ret = request_irq(omap_prcm_event_to_irq("wkup"), 478 _prcm_int_handle_wakeup, IRQF_NO_SUSPEND, "pm_wkup", NULL); 479 480 if (ret) { 481 pr_err("pm: Failed to request pm_wkup irq\n"); 482 goto err1; 483 } 484 485 /* IO interrupt is shared with mux code */ 486 ret = request_irq(omap_prcm_event_to_irq("io"), 487 _prcm_int_handle_io, IRQF_SHARED | IRQF_NO_SUSPEND, "pm_io", 488 omap3_pm_init); 489 enable_irq(omap_prcm_event_to_irq("io")); 490 491 if (ret) { 492 pr_err("pm: Failed to request pm_io irq\n"); 493 goto err2; 494 } 495 496 ret = pwrdm_for_each(pwrdms_setup, NULL); 497 if (ret) { 498 pr_err("Failed to setup powerdomains\n"); 499 goto err3; 500 } 501 502 (void) clkdm_for_each(omap_pm_clkdms_setup, NULL); 503 504 mpu_pwrdm = pwrdm_lookup("mpu_pwrdm"); 505 if (mpu_pwrdm == NULL) { 506 pr_err("Failed to get mpu_pwrdm\n"); 507 ret = -EINVAL; 508 goto err3; 509 } 510 511 neon_pwrdm = pwrdm_lookup("neon_pwrdm"); 512 per_pwrdm = pwrdm_lookup("per_pwrdm"); 513 core_pwrdm = pwrdm_lookup("core_pwrdm"); 514 515 neon_clkdm = clkdm_lookup("neon_clkdm"); 516 mpu_clkdm = clkdm_lookup("mpu_clkdm"); 517 per_clkdm = clkdm_lookup("per_clkdm"); 518 wkup_clkdm = clkdm_lookup("wkup_clkdm"); 519 520 omap_common_suspend_init(omap3_pm_suspend); 521 522 arm_pm_idle = omap3_pm_idle; 523 omap3_idle_init(); 524 525 /* 526 * RTA is disabled during initialization as per erratum i608 527 * it is safer to disable RTA by the bootloader, but we would like 528 * to be doubly sure here and prevent any mishaps. 529 */ 530 if (IS_PM34XX_ERRATUM(PM_RTA_ERRATUM_i608)) 531 omap3630_ctrl_disable_rta(); 532 533 /* 534 * The UART3/4 FIFO and the sidetone memory in McBSP2/3 are 535 * not correctly reset when the PER powerdomain comes back 536 * from OFF or OSWR when the CORE powerdomain is kept active. 537 * See OMAP36xx Erratum i582 "PER Domain reset issue after 538 * Domain-OFF/OSWR Wakeup". This wakeup dependency is not a 539 * complete workaround. The kernel must also prevent the PER 540 * powerdomain from going to OSWR/OFF while the CORE 541 * powerdomain is not going to OSWR/OFF. And if PER last 542 * power state was off while CORE last power state was ON, the 543 * UART3/4 and McBSP2/3 SIDETONE devices need to run a 544 * self-test using their loopback tests; if that fails, those 545 * devices are unusable until the PER/CORE can complete a transition 546 * from ON to OSWR/OFF and then back to ON. 547 * 548 * XXX Technically this workaround is only needed if off-mode 549 * or OSWR is enabled. 550 */ 551 if (IS_PM34XX_ERRATUM(PM_PER_MEMORIES_ERRATUM_i582)) 552 clkdm_add_wkdep(per_clkdm, wkup_clkdm); 553 554 clkdm_add_wkdep(neon_clkdm, mpu_clkdm); 555 if (omap_type() != OMAP2_DEVICE_TYPE_GP) { 556 omap3_secure_ram_storage = 557 kmalloc(0x803F, GFP_KERNEL); 558 if (!omap3_secure_ram_storage) 559 pr_err("Memory allocation failed when allocating for secure sram context\n"); 560 561 local_irq_disable(); 562 563 omap_dma_global_context_save(); 564 omap3_save_secure_ram_context(); 565 omap_dma_global_context_restore(); 566 567 local_irq_enable(); 568 } 569 570 omap3_save_scratchpad_contents(); 571 return ret; 572 573 err3: 574 list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) { 575 list_del(&pwrst->node); 576 kfree(pwrst); 577 } 578 free_irq(omap_prcm_event_to_irq("io"), omap3_pm_init); 579 err2: 580 free_irq(omap_prcm_event_to_irq("wkup"), NULL); 581 err1: 582 return ret; 583 } 584