1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2013 Thomas Skibo 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 /* 32 * Zynq-700 SLCR driver. Provides hooks for cpu_reset and PL control stuff. 33 * In the future, maybe MIO control, clock control, etc. could go here. 34 * 35 * Reference: Zynq-7000 All Programmable SoC Technical Reference Manual. 36 * (v1.4) November 16, 2012. Xilinx doc UG585. 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/conf.h> 45 #include <sys/kernel.h> 46 #include <sys/module.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/resource.h> 50 #include <sys/sysctl.h> 51 #include <sys/rman.h> 52 53 #include <machine/bus.h> 54 #include <machine/resource.h> 55 #include <machine/stdarg.h> 56 57 #include <dev/ofw/ofw_bus.h> 58 #include <dev/ofw/ofw_bus_subr.h> 59 60 #include <arm/xilinx/zy7_slcr.h> 61 62 struct zy7_slcr_softc { 63 device_t dev; 64 struct mtx sc_mtx; 65 struct resource *mem_res; 66 }; 67 68 static struct zy7_slcr_softc *zy7_slcr_softc_p; 69 extern void (*zynq7_cpu_reset); 70 71 #define ZSLCR_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 72 #define ZSLCR_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 73 #define ZSLCR_LOCK_INIT(sc) \ 74 mtx_init(&(sc)->sc_mtx, device_get_nameunit((sc)->dev), \ 75 "zy7_slcr", MTX_DEF) 76 #define ZSLCR_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 77 78 #define RD4(sc, off) (bus_read_4((sc)->mem_res, (off))) 79 #define WR4(sc, off, val) (bus_write_4((sc)->mem_res, (off), (val))) 80 81 #define ZYNQ_DEFAULT_PS_CLK_FREQUENCY 33333333 /* 33.3 Mhz */ 82 83 SYSCTL_NODE(_hw, OID_AUTO, zynq, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 84 "Xilinx Zynq-7000"); 85 86 static char zynq_bootmode[64]; 87 SYSCTL_STRING(_hw_zynq, OID_AUTO, bootmode, CTLFLAG_RD, zynq_bootmode, 0, 88 "Zynq boot mode"); 89 90 static char zynq_pssid[100]; 91 SYSCTL_STRING(_hw_zynq, OID_AUTO, pssid, CTLFLAG_RD, zynq_pssid, 0, 92 "Zynq PSS IDCODE"); 93 94 static uint32_t zynq_reboot_status; 95 SYSCTL_INT(_hw_zynq, OID_AUTO, reboot_status, CTLFLAG_RD, &zynq_reboot_status, 96 0, "Zynq REBOOT_STATUS register"); 97 98 static int ps_clk_frequency; 99 SYSCTL_INT(_hw_zynq, OID_AUTO, ps_clk_frequency, CTLFLAG_RD, &ps_clk_frequency, 100 0, "Zynq PS_CLK Frequency"); 101 102 static int io_pll_frequency; 103 SYSCTL_INT(_hw_zynq, OID_AUTO, io_pll_frequency, CTLFLAG_RD, &io_pll_frequency, 104 0, "Zynq IO PLL Frequency"); 105 106 static int arm_pll_frequency; 107 SYSCTL_INT(_hw_zynq, OID_AUTO, arm_pll_frequency, CTLFLAG_RD, 108 &arm_pll_frequency, 0, "Zynq ARM PLL Frequency"); 109 110 static int ddr_pll_frequency; 111 SYSCTL_INT(_hw_zynq, OID_AUTO, ddr_pll_frequency, CTLFLAG_RD, 112 &ddr_pll_frequency, 0, "Zynq DDR PLL Frequency"); 113 114 static void 115 zy7_slcr_unlock(struct zy7_slcr_softc *sc) 116 { 117 118 /* Unlock SLCR with magic number. */ 119 WR4(sc, ZY7_SLCR_UNLOCK, ZY7_SLCR_UNLOCK_MAGIC); 120 } 121 122 static void 123 zy7_slcr_lock(struct zy7_slcr_softc *sc) 124 { 125 126 /* Lock SLCR with magic number. */ 127 WR4(sc, ZY7_SLCR_LOCK, ZY7_SLCR_LOCK_MAGIC); 128 } 129 130 static void 131 zy7_slcr_cpu_reset(void) 132 { 133 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 134 135 /* Unlock SLCR registers. */ 136 zy7_slcr_unlock(sc); 137 138 /* This has something to do with a work-around so the fsbl will load 139 * the bitstream after soft-reboot. It's very important. 140 */ 141 WR4(sc, ZY7_SLCR_REBOOT_STAT, 142 RD4(sc, ZY7_SLCR_REBOOT_STAT) & 0xf0ffffff); 143 144 /* Soft reset */ 145 WR4(sc, ZY7_SLCR_PSS_RST_CTRL, ZY7_SLCR_PSS_RST_CTRL_SOFT_RESET); 146 147 for (;;) 148 ; 149 } 150 151 /* Assert PL resets and disable level shifters in preparation of programming 152 * the PL (FPGA) section. Called from zy7_devcfg.c. 153 */ 154 void 155 zy7_slcr_preload_pl(void) 156 { 157 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 158 159 if (!sc) 160 return; 161 162 ZSLCR_LOCK(sc); 163 164 /* Unlock SLCR registers. */ 165 zy7_slcr_unlock(sc); 166 167 /* Assert top level output resets. */ 168 WR4(sc, ZY7_SLCR_FPGA_RST_CTRL, ZY7_SLCR_FPGA_RST_CTRL_RST_ALL); 169 170 /* Disable all level shifters. */ 171 WR4(sc, ZY7_SLCR_LVL_SHFTR_EN, 0); 172 173 /* Lock SLCR registers. */ 174 zy7_slcr_lock(sc); 175 176 ZSLCR_UNLOCK(sc); 177 } 178 179 /* After PL configuration, enable level shifters and deassert top-level 180 * PL resets. Called from zy7_devcfg.c. Optionally, the level shifters 181 * can be left disabled but that's rare of an FPGA application. That option 182 * is controlled by a sysctl in the devcfg driver. 183 */ 184 void 185 zy7_slcr_postload_pl(int en_level_shifters) 186 { 187 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 188 189 if (!sc) 190 return; 191 192 ZSLCR_LOCK(sc); 193 194 /* Unlock SLCR registers. */ 195 zy7_slcr_unlock(sc); 196 197 if (en_level_shifters) 198 /* Enable level shifters. */ 199 WR4(sc, ZY7_SLCR_LVL_SHFTR_EN, ZY7_SLCR_LVL_SHFTR_EN_ALL); 200 201 /* Deassert top level output resets. */ 202 WR4(sc, ZY7_SLCR_FPGA_RST_CTRL, 0); 203 204 /* Lock SLCR registers. */ 205 zy7_slcr_lock(sc); 206 207 ZSLCR_UNLOCK(sc); 208 } 209 210 /* Override cgem_set_refclk() in gigabit ethernet driver 211 * (sys/dev/cadence/if_cgem.c). This function is called to 212 * request a change in the gem's reference clock speed. 213 */ 214 int 215 cgem_set_ref_clk(int unit, int frequency) 216 { 217 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 218 int div0, div1; 219 220 if (!sc) 221 return (-1); 222 223 /* Find suitable divisor pairs. Round result to nearest khz 224 * to test for match. 225 */ 226 for (div1 = 1; div1 <= ZY7_SLCR_GEM_CLK_CTRL_DIVISOR1_MAX; div1++) { 227 div0 = (io_pll_frequency + div1 * frequency / 2) / 228 div1 / frequency; 229 if (div0 > 0 && div0 <= ZY7_SLCR_GEM_CLK_CTRL_DIVISOR_MAX && 230 ((io_pll_frequency / div0 / div1) + 500) / 1000 == 231 (frequency + 500) / 1000) 232 break; 233 } 234 235 if (div1 > ZY7_SLCR_GEM_CLK_CTRL_DIVISOR1_MAX) 236 return (-1); 237 238 ZSLCR_LOCK(sc); 239 240 /* Unlock SLCR registers. */ 241 zy7_slcr_unlock(sc); 242 243 /* Modify GEM reference clock. */ 244 WR4(sc, unit ? ZY7_SLCR_GEM1_CLK_CTRL : ZY7_SLCR_GEM0_CLK_CTRL, 245 (div1 << ZY7_SLCR_GEM_CLK_CTRL_DIVISOR1_SHIFT) | 246 (div0 << ZY7_SLCR_GEM_CLK_CTRL_DIVISOR_SHIFT) | 247 ZY7_SLCR_GEM_CLK_CTRL_SRCSEL_IO_PLL | 248 ZY7_SLCR_GEM_CLK_CTRL_CLKACT); 249 250 /* Lock SLCR registers. */ 251 zy7_slcr_lock(sc); 252 253 ZSLCR_UNLOCK(sc); 254 255 return (0); 256 } 257 258 /* 259 * PL clocks management function 260 */ 261 int 262 zy7_pl_fclk_set_source(int unit, int source) 263 { 264 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 265 uint32_t reg; 266 267 if (!sc) 268 return (-1); 269 270 ZSLCR_LOCK(sc); 271 272 /* Unlock SLCR registers. */ 273 zy7_slcr_unlock(sc); 274 275 /* Modify FPGAx source. */ 276 reg = RD4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit)); 277 reg &= ~(ZY7_SLCR_FPGA_CLK_CTRL_SRCSEL_MASK); 278 reg |= (source << ZY7_SLCR_FPGA_CLK_CTRL_SRCSEL_SHIFT); 279 WR4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit), reg); 280 281 /* Lock SLCR registers. */ 282 zy7_slcr_lock(sc); 283 284 ZSLCR_UNLOCK(sc); 285 286 return (0); 287 } 288 289 int 290 zy7_pl_fclk_get_source(int unit) 291 { 292 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 293 uint32_t reg; 294 int source; 295 296 if (!sc) 297 return (-1); 298 299 ZSLCR_LOCK(sc); 300 301 /* Modify GEM reference clock. */ 302 reg = RD4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit)); 303 source = (reg & ZY7_SLCR_FPGA_CLK_CTRL_SRCSEL_MASK) >> 304 ZY7_SLCR_FPGA_CLK_CTRL_SRCSEL_SHIFT; 305 306 /* ZY7_PL_FCLK_SRC_IO is actually b0x */ 307 if ((source & 2) == 0) 308 source = ZY7_PL_FCLK_SRC_IO; 309 310 ZSLCR_UNLOCK(sc); 311 312 return (source); 313 } 314 315 int 316 zy7_pl_fclk_set_freq(int unit, int frequency) 317 { 318 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 319 int div0, div1; 320 int base_frequency; 321 uint32_t reg; 322 int source; 323 324 if (!sc) 325 return (-1); 326 327 source = zy7_pl_fclk_get_source(unit); 328 switch (source) { 329 case ZY7_PL_FCLK_SRC_IO: 330 base_frequency = io_pll_frequency; 331 break; 332 333 case ZY7_PL_FCLK_SRC_ARM: 334 base_frequency = arm_pll_frequency; 335 break; 336 337 case ZY7_PL_FCLK_SRC_DDR: 338 base_frequency = ddr_pll_frequency; 339 break; 340 341 default: 342 return (-1); 343 } 344 345 /* Find suitable divisor pairs. Round result to nearest khz 346 * to test for match. 347 */ 348 for (div1 = 1; div1 <= ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR_MAX; div1++) { 349 div0 = (base_frequency + div1 * frequency / 2) / 350 div1 / frequency; 351 if (div0 > 0 && div0 <= ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR_MAX && 352 ((base_frequency / div0 / div1) + 500) / 1000 == 353 (frequency + 500) / 1000) 354 break; 355 } 356 357 if (div1 > ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR_MAX) 358 return (-1); 359 360 ZSLCR_LOCK(sc); 361 362 /* Unlock SLCR registers. */ 363 zy7_slcr_unlock(sc); 364 365 /* Modify FPGAx reference clock. */ 366 reg = RD4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit)); 367 reg &= ~(ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR1_MASK | 368 ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR0_MASK); 369 reg |= (div1 << ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR1_SHIFT) | 370 (div0 << ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR0_SHIFT); 371 WR4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit), reg); 372 373 /* Lock SLCR registers. */ 374 zy7_slcr_lock(sc); 375 376 ZSLCR_UNLOCK(sc); 377 378 return (base_frequency / div0 / div1); 379 } 380 381 int 382 zy7_pl_fclk_get_freq(int unit) 383 { 384 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 385 int div0, div1; 386 int base_frequency; 387 int frequency; 388 uint32_t reg; 389 int source; 390 391 if (!sc) 392 return (-1); 393 394 source = zy7_pl_fclk_get_source(unit); 395 switch (source) { 396 case ZY7_PL_FCLK_SRC_IO: 397 base_frequency = io_pll_frequency; 398 break; 399 400 case ZY7_PL_FCLK_SRC_ARM: 401 base_frequency = arm_pll_frequency; 402 break; 403 404 case ZY7_PL_FCLK_SRC_DDR: 405 base_frequency = ddr_pll_frequency; 406 break; 407 408 default: 409 return (-1); 410 } 411 412 ZSLCR_LOCK(sc); 413 414 /* Modify FPGAx reference clock. */ 415 reg = RD4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit)); 416 div1 = (reg & ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR1_MASK) >> 417 ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR1_SHIFT; 418 div0 = (reg & ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR0_MASK) >> 419 ZY7_SLCR_FPGA_CLK_CTRL_DIVISOR0_SHIFT; 420 421 ZSLCR_UNLOCK(sc); 422 423 if (div0 == 0) 424 div0 = 1; 425 426 if (div1 == 0) 427 div1 = 1; 428 429 frequency = (base_frequency / div0 / div1); 430 /* Round to KHz */ 431 frequency = (frequency + 500) / 1000; 432 frequency = frequency * 1000; 433 434 return (frequency); 435 } 436 437 int 438 zy7_pl_fclk_enable(int unit) 439 { 440 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 441 442 if (!sc) 443 return (-1); 444 445 ZSLCR_LOCK(sc); 446 447 /* Unlock SLCR registers. */ 448 zy7_slcr_unlock(sc); 449 450 WR4(sc, ZY7_SLCR_FPGA_THR_CTRL(unit), 0); 451 WR4(sc, ZY7_SLCR_FPGA_THR_CNT(unit), 0); 452 453 /* Lock SLCR registers. */ 454 zy7_slcr_lock(sc); 455 456 ZSLCR_UNLOCK(sc); 457 458 return (0); 459 } 460 461 int 462 zy7_pl_fclk_disable(int unit) 463 { 464 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 465 466 if (!sc) 467 return (-1); 468 469 ZSLCR_LOCK(sc); 470 471 /* Unlock SLCR registers. */ 472 zy7_slcr_unlock(sc); 473 474 WR4(sc, ZY7_SLCR_FPGA_THR_CTRL(unit), 0); 475 WR4(sc, ZY7_SLCR_FPGA_THR_CNT(unit), 1); 476 477 /* Lock SLCR registers. */ 478 zy7_slcr_lock(sc); 479 480 ZSLCR_UNLOCK(sc); 481 482 return (0); 483 } 484 485 int 486 zy7_pl_fclk_enabled(int unit) 487 { 488 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 489 uint32_t reg; 490 491 if (!sc) 492 return (-1); 493 494 ZSLCR_LOCK(sc); 495 reg = RD4(sc, ZY7_SLCR_FPGA_THR_CNT(unit)); 496 ZSLCR_UNLOCK(sc); 497 498 return !(reg & 1); 499 } 500 501 int 502 zy7_pl_level_shifters_enabled(void) 503 { 504 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 505 506 uint32_t reg; 507 508 if (!sc) 509 return (-1); 510 511 ZSLCR_LOCK(sc); 512 reg = RD4(sc, ZY7_SLCR_LVL_SHFTR_EN); 513 ZSLCR_UNLOCK(sc); 514 515 return (reg == ZY7_SLCR_LVL_SHFTR_EN_ALL); 516 } 517 518 void 519 zy7_pl_level_shifters_enable(void) 520 { 521 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 522 523 if (!sc) 524 return; 525 526 ZSLCR_LOCK(sc); 527 zy7_slcr_unlock(sc); 528 WR4(sc, ZY7_SLCR_LVL_SHFTR_EN, ZY7_SLCR_LVL_SHFTR_EN_ALL); 529 zy7_slcr_lock(sc); 530 ZSLCR_UNLOCK(sc); 531 } 532 533 void 534 zy7_pl_level_shifters_disable(void) 535 { 536 struct zy7_slcr_softc *sc = zy7_slcr_softc_p; 537 538 if (!sc) 539 return; 540 541 ZSLCR_LOCK(sc); 542 zy7_slcr_unlock(sc); 543 WR4(sc, ZY7_SLCR_LVL_SHFTR_EN, 0); 544 zy7_slcr_lock(sc); 545 ZSLCR_UNLOCK(sc); 546 } 547 548 static int 549 zy7_slcr_probe(device_t dev) 550 { 551 552 if (!ofw_bus_status_okay(dev)) 553 return (ENXIO); 554 555 if (!ofw_bus_is_compatible(dev, "xlnx,zy7_slcr")) 556 return (ENXIO); 557 558 device_set_desc(dev, "Zynq-7000 slcr block"); 559 return (0); 560 } 561 562 static int 563 zy7_slcr_attach(device_t dev) 564 { 565 struct zy7_slcr_softc *sc = device_get_softc(dev); 566 int rid; 567 phandle_t node; 568 pcell_t cell; 569 uint32_t bootmode; 570 uint32_t pss_idcode; 571 uint32_t arm_pll_ctrl; 572 uint32_t ddr_pll_ctrl; 573 uint32_t io_pll_ctrl; 574 static char *bootdev_names[] = { 575 "JTAG", "Quad-SPI", "NOR", "(3?)", 576 "NAND", "SD Card", "(6?)", "(7?)" 577 }; 578 579 /* Allow only one attach. */ 580 if (zy7_slcr_softc_p != NULL) 581 return (ENXIO); 582 583 sc->dev = dev; 584 585 ZSLCR_LOCK_INIT(sc); 586 587 /* Get memory resource. */ 588 rid = 0; 589 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 590 RF_ACTIVE); 591 if (sc->mem_res == NULL) { 592 device_printf(dev, "could not allocate memory resources.\n"); 593 return (ENOMEM); 594 } 595 596 /* Hook up cpu_reset. */ 597 zy7_slcr_softc_p = sc; 598 zynq7_cpu_reset = zy7_slcr_cpu_reset; 599 600 /* Read info and set sysctls. */ 601 bootmode = RD4(sc, ZY7_SLCR_BOOT_MODE); 602 snprintf(zynq_bootmode, sizeof(zynq_bootmode), 603 "0x%x: boot device: %s", bootmode, 604 bootdev_names[bootmode & ZY7_SLCR_BOOT_MODE_BOOTDEV_MASK]); 605 606 pss_idcode = RD4(sc, ZY7_SLCR_PSS_IDCODE); 607 snprintf(zynq_pssid, sizeof(zynq_pssid), 608 "0x%x: manufacturer: 0x%x device: 0x%x " 609 "family: 0x%x sub-family: 0x%x rev: 0x%x", 610 pss_idcode, 611 (pss_idcode & ZY7_SLCR_PSS_IDCODE_MNFR_ID_MASK) >> 612 ZY7_SLCR_PSS_IDCODE_MNFR_ID_SHIFT, 613 (pss_idcode & ZY7_SLCR_PSS_IDCODE_DEVICE_MASK) >> 614 ZY7_SLCR_PSS_IDCODE_DEVICE_SHIFT, 615 (pss_idcode & ZY7_SLCR_PSS_IDCODE_FAMILY_MASK) >> 616 ZY7_SLCR_PSS_IDCODE_FAMILY_SHIFT, 617 (pss_idcode & ZY7_SLCR_PSS_IDCODE_SUB_FAMILY_MASK) >> 618 ZY7_SLCR_PSS_IDCODE_SUB_FAMILY_SHIFT, 619 (pss_idcode & ZY7_SLCR_PSS_IDCODE_REVISION_MASK) >> 620 ZY7_SLCR_PSS_IDCODE_REVISION_SHIFT); 621 622 zynq_reboot_status = RD4(sc, ZY7_SLCR_REBOOT_STAT); 623 624 /* Derive PLL frequencies from PS_CLK. */ 625 node = ofw_bus_get_node(dev); 626 if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) > 0) 627 ps_clk_frequency = cell; 628 else 629 ps_clk_frequency = ZYNQ_DEFAULT_PS_CLK_FREQUENCY; 630 631 arm_pll_ctrl = RD4(sc, ZY7_SLCR_ARM_PLL_CTRL); 632 ddr_pll_ctrl = RD4(sc, ZY7_SLCR_DDR_PLL_CTRL); 633 io_pll_ctrl = RD4(sc, ZY7_SLCR_IO_PLL_CTRL); 634 635 /* Determine ARM PLL frequency. */ 636 if (((arm_pll_ctrl & ZY7_SLCR_PLL_CTRL_BYPASS_QUAL) == 0 && 637 (arm_pll_ctrl & ZY7_SLCR_PLL_CTRL_BYPASS_FORCE) != 0) || 638 ((arm_pll_ctrl & ZY7_SLCR_PLL_CTRL_BYPASS_QUAL) != 0 && 639 (bootmode & ZY7_SLCR_BOOT_MODE_PLL_BYPASS) != 0)) 640 /* PLL is bypassed. */ 641 arm_pll_frequency = ps_clk_frequency; 642 else 643 arm_pll_frequency = ps_clk_frequency * 644 ((arm_pll_ctrl & ZY7_SLCR_PLL_CTRL_FDIV_MASK) >> 645 ZY7_SLCR_PLL_CTRL_FDIV_SHIFT); 646 647 /* Determine DDR PLL frequency. */ 648 if (((ddr_pll_ctrl & ZY7_SLCR_PLL_CTRL_BYPASS_QUAL) == 0 && 649 (ddr_pll_ctrl & ZY7_SLCR_PLL_CTRL_BYPASS_FORCE) != 0) || 650 ((ddr_pll_ctrl & ZY7_SLCR_PLL_CTRL_BYPASS_QUAL) != 0 && 651 (bootmode & ZY7_SLCR_BOOT_MODE_PLL_BYPASS) != 0)) 652 /* PLL is bypassed. */ 653 ddr_pll_frequency = ps_clk_frequency; 654 else 655 ddr_pll_frequency = ps_clk_frequency * 656 ((ddr_pll_ctrl & ZY7_SLCR_PLL_CTRL_FDIV_MASK) >> 657 ZY7_SLCR_PLL_CTRL_FDIV_SHIFT); 658 659 /* Determine IO PLL frequency. */ 660 if (((io_pll_ctrl & ZY7_SLCR_PLL_CTRL_BYPASS_QUAL) == 0 && 661 (io_pll_ctrl & ZY7_SLCR_PLL_CTRL_BYPASS_FORCE) != 0) || 662 ((io_pll_ctrl & ZY7_SLCR_PLL_CTRL_BYPASS_QUAL) != 0 && 663 (bootmode & ZY7_SLCR_BOOT_MODE_PLL_BYPASS) != 0)) 664 /* PLL is bypassed. */ 665 io_pll_frequency = ps_clk_frequency; 666 else 667 io_pll_frequency = ps_clk_frequency * 668 ((io_pll_ctrl & ZY7_SLCR_PLL_CTRL_FDIV_MASK) >> 669 ZY7_SLCR_PLL_CTRL_FDIV_SHIFT); 670 671 /* Lock SLCR registers. */ 672 zy7_slcr_lock(sc); 673 674 return (0); 675 } 676 677 static int 678 zy7_slcr_detach(device_t dev) 679 { 680 struct zy7_slcr_softc *sc = device_get_softc(dev); 681 682 bus_generic_detach(dev); 683 684 /* Release memory resource. */ 685 if (sc->mem_res != NULL) 686 bus_release_resource(dev, SYS_RES_MEMORY, 687 rman_get_rid(sc->mem_res), sc->mem_res); 688 689 zy7_slcr_softc_p = NULL; 690 zynq7_cpu_reset = NULL; 691 692 ZSLCR_LOCK_DESTROY(sc); 693 694 return (0); 695 } 696 697 static device_method_t zy7_slcr_methods[] = { 698 /* device_if */ 699 DEVMETHOD(device_probe, zy7_slcr_probe), 700 DEVMETHOD(device_attach, zy7_slcr_attach), 701 DEVMETHOD(device_detach, zy7_slcr_detach), 702 703 DEVMETHOD_END 704 }; 705 706 static driver_t zy7_slcr_driver = { 707 "zy7_slcr", 708 zy7_slcr_methods, 709 sizeof(struct zy7_slcr_softc), 710 }; 711 static devclass_t zy7_slcr_devclass; 712 713 DRIVER_MODULE(zy7_slcr, simplebus, zy7_slcr_driver, zy7_slcr_devclass, 0, 0); 714 MODULE_VERSION(zy7_slcr, 1); 715