1 /* 2 * OMAP4 PRM module functions 3 * 4 * Copyright (C) 2011-2012 Texas Instruments, Inc. 5 * Copyright (C) 2010 Nokia Corporation 6 * Benoît Cousson 7 * Paul Walmsley 8 * Rajendra Nayak <rnayak@ti.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/delay.h> 17 #include <linux/errno.h> 18 #include <linux/err.h> 19 #include <linux/io.h> 20 #include <linux/of_irq.h> 21 #include <linux/of.h> 22 23 #include "soc.h" 24 #include "iomap.h" 25 #include "common.h" 26 #include "vp.h" 27 #include "prm44xx.h" 28 #include "prcm43xx.h" 29 #include "prm-regbits-44xx.h" 30 #include "prcm44xx.h" 31 #include "prminst44xx.h" 32 #include "powerdomain.h" 33 34 /* Static data */ 35 36 static void omap44xx_prm_read_pending_irqs(unsigned long *events); 37 static void omap44xx_prm_ocp_barrier(void); 38 static void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask); 39 static void omap44xx_prm_restore_irqen(u32 *saved_mask); 40 static void omap44xx_prm_reconfigure_io_chain(void); 41 42 static const struct omap_prcm_irq omap4_prcm_irqs[] = { 43 OMAP_PRCM_IRQ("io", 9, 1), 44 }; 45 46 static struct omap_prcm_irq_setup omap4_prcm_irq_setup = { 47 .ack = OMAP4_PRM_IRQSTATUS_MPU_OFFSET, 48 .mask = OMAP4_PRM_IRQENABLE_MPU_OFFSET, 49 .pm_ctrl = OMAP4_PRM_IO_PMCTRL_OFFSET, 50 .nr_regs = 2, 51 .irqs = omap4_prcm_irqs, 52 .nr_irqs = ARRAY_SIZE(omap4_prcm_irqs), 53 .irq = 11 + OMAP44XX_IRQ_GIC_START, 54 .xlate_irq = omap4_xlate_irq, 55 .read_pending_irqs = &omap44xx_prm_read_pending_irqs, 56 .ocp_barrier = &omap44xx_prm_ocp_barrier, 57 .save_and_clear_irqen = &omap44xx_prm_save_and_clear_irqen, 58 .restore_irqen = &omap44xx_prm_restore_irqen, 59 .reconfigure_io_chain = &omap44xx_prm_reconfigure_io_chain, 60 }; 61 62 /* 63 * omap44xx_prm_reset_src_map - map from bits in the PRM_RSTST 64 * hardware register (which are specific to OMAP44xx SoCs) to reset 65 * source ID bit shifts (which is an OMAP SoC-independent 66 * enumeration) 67 */ 68 static struct prm_reset_src_map omap44xx_prm_reset_src_map[] = { 69 { OMAP4430_GLOBAL_WARM_SW_RST_SHIFT, 70 OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT }, 71 { OMAP4430_GLOBAL_COLD_RST_SHIFT, 72 OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT }, 73 { OMAP4430_MPU_SECURITY_VIOL_RST_SHIFT, 74 OMAP_SECU_VIOL_RST_SRC_ID_SHIFT }, 75 { OMAP4430_MPU_WDT_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT }, 76 { OMAP4430_SECURE_WDT_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT }, 77 { OMAP4430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT }, 78 { OMAP4430_VDD_MPU_VOLT_MGR_RST_SHIFT, 79 OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT }, 80 { OMAP4430_VDD_IVA_VOLT_MGR_RST_SHIFT, 81 OMAP_VDD_IVA_VM_RST_SRC_ID_SHIFT }, 82 { OMAP4430_VDD_CORE_VOLT_MGR_RST_SHIFT, 83 OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT }, 84 { OMAP4430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT }, 85 { OMAP4430_C2C_RST_SHIFT, OMAP_C2C_RST_SRC_ID_SHIFT }, 86 { -1, -1 }, 87 }; 88 89 /* PRM low-level functions */ 90 91 /* Read a register in a CM/PRM instance in the PRM module */ 92 static u32 omap4_prm_read_inst_reg(s16 inst, u16 reg) 93 { 94 return readl_relaxed(prm_base.va + inst + reg); 95 } 96 97 /* Write into a register in a CM/PRM instance in the PRM module */ 98 static void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg) 99 { 100 writel_relaxed(val, prm_base.va + inst + reg); 101 } 102 103 /* Read-modify-write a register in a PRM module. Caller must lock */ 104 static u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg) 105 { 106 u32 v; 107 108 v = omap4_prm_read_inst_reg(inst, reg); 109 v &= ~mask; 110 v |= bits; 111 omap4_prm_write_inst_reg(v, inst, reg); 112 113 return v; 114 } 115 116 /* PRM VP */ 117 118 /* 119 * struct omap4_vp - OMAP4 VP register access description. 120 * @irqstatus_mpu: offset to IRQSTATUS_MPU register for VP 121 * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg 122 */ 123 struct omap4_vp { 124 u32 irqstatus_mpu; 125 u32 tranxdone_status; 126 }; 127 128 static struct omap4_vp omap4_vp[] = { 129 [OMAP4_VP_VDD_MPU_ID] = { 130 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET, 131 .tranxdone_status = OMAP4430_VP_MPU_TRANXDONE_ST_MASK, 132 }, 133 [OMAP4_VP_VDD_IVA_ID] = { 134 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET, 135 .tranxdone_status = OMAP4430_VP_IVA_TRANXDONE_ST_MASK, 136 }, 137 [OMAP4_VP_VDD_CORE_ID] = { 138 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET, 139 .tranxdone_status = OMAP4430_VP_CORE_TRANXDONE_ST_MASK, 140 }, 141 }; 142 143 static u32 omap4_prm_vp_check_txdone(u8 vp_id) 144 { 145 struct omap4_vp *vp = &omap4_vp[vp_id]; 146 u32 irqstatus; 147 148 irqstatus = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, 149 OMAP4430_PRM_OCP_SOCKET_INST, 150 vp->irqstatus_mpu); 151 return irqstatus & vp->tranxdone_status; 152 } 153 154 static void omap4_prm_vp_clear_txdone(u8 vp_id) 155 { 156 struct omap4_vp *vp = &omap4_vp[vp_id]; 157 158 omap4_prminst_write_inst_reg(vp->tranxdone_status, 159 OMAP4430_PRM_PARTITION, 160 OMAP4430_PRM_OCP_SOCKET_INST, 161 vp->irqstatus_mpu); 162 }; 163 164 u32 omap4_prm_vcvp_read(u8 offset) 165 { 166 s32 inst = omap4_prmst_get_prm_dev_inst(); 167 168 if (inst == PRM_INSTANCE_UNKNOWN) 169 return 0; 170 171 return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, 172 inst, offset); 173 } 174 175 void omap4_prm_vcvp_write(u32 val, u8 offset) 176 { 177 s32 inst = omap4_prmst_get_prm_dev_inst(); 178 179 if (inst == PRM_INSTANCE_UNKNOWN) 180 return; 181 182 omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION, 183 inst, offset); 184 } 185 186 u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset) 187 { 188 s32 inst = omap4_prmst_get_prm_dev_inst(); 189 190 if (inst == PRM_INSTANCE_UNKNOWN) 191 return 0; 192 193 return omap4_prminst_rmw_inst_reg_bits(mask, bits, 194 OMAP4430_PRM_PARTITION, 195 inst, 196 offset); 197 } 198 199 static inline u32 _read_pending_irq_reg(u16 irqen_offs, u16 irqst_offs) 200 { 201 u32 mask, st; 202 203 /* XXX read mask from RAM? */ 204 mask = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST, 205 irqen_offs); 206 st = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST, irqst_offs); 207 208 return mask & st; 209 } 210 211 /** 212 * omap44xx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events 213 * @events: ptr to two consecutive u32s, preallocated by caller 214 * 215 * Read PRM_IRQSTATUS_MPU* bits, AND'ed with the currently-enabled PRM 216 * MPU IRQs, and store the result into the two u32s pointed to by @events. 217 * No return value. 218 */ 219 static void omap44xx_prm_read_pending_irqs(unsigned long *events) 220 { 221 int i; 222 223 for (i = 0; i < omap4_prcm_irq_setup.nr_regs; i++) 224 events[i] = _read_pending_irq_reg(omap4_prcm_irq_setup.mask + 225 i * 4, omap4_prcm_irq_setup.ack + i * 4); 226 } 227 228 /** 229 * omap44xx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete 230 * 231 * Force any buffered writes to the PRM IP block to complete. Needed 232 * by the PRM IRQ handler, which reads and writes directly to the IP 233 * block, to avoid race conditions after acknowledging or clearing IRQ 234 * bits. No return value. 235 */ 236 static void omap44xx_prm_ocp_barrier(void) 237 { 238 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST, 239 OMAP4_REVISION_PRM_OFFSET); 240 } 241 242 /** 243 * omap44xx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU* regs 244 * @saved_mask: ptr to a u32 array to save IRQENABLE bits 245 * 246 * Save the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers to 247 * @saved_mask. @saved_mask must be allocated by the caller. 248 * Intended to be used in the PRM interrupt handler suspend callback. 249 * The OCP barrier is needed to ensure the write to disable PRM 250 * interrupts reaches the PRM before returning; otherwise, spurious 251 * interrupts might occur. No return value. 252 */ 253 static void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask) 254 { 255 int i; 256 u16 reg; 257 258 for (i = 0; i < omap4_prcm_irq_setup.nr_regs; i++) { 259 reg = omap4_prcm_irq_setup.mask + i * 4; 260 261 saved_mask[i] = 262 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST, 263 reg); 264 omap4_prm_write_inst_reg(0, OMAP4430_PRM_OCP_SOCKET_INST, reg); 265 } 266 267 /* OCP barrier */ 268 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST, 269 OMAP4_REVISION_PRM_OFFSET); 270 } 271 272 /** 273 * omap44xx_prm_restore_irqen - set PRM_IRQENABLE_MPU* registers from args 274 * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously 275 * 276 * Restore the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers from 277 * @saved_mask. Intended to be used in the PRM interrupt handler resume 278 * callback to restore values saved by omap44xx_prm_save_and_clear_irqen(). 279 * No OCP barrier should be needed here; any pending PRM interrupts will fire 280 * once the writes reach the PRM. No return value. 281 */ 282 static void omap44xx_prm_restore_irqen(u32 *saved_mask) 283 { 284 int i; 285 286 for (i = 0; i < omap4_prcm_irq_setup.nr_regs; i++) 287 omap4_prm_write_inst_reg(saved_mask[i], 288 OMAP4430_PRM_OCP_SOCKET_INST, 289 omap4_prcm_irq_setup.mask + i * 4); 290 } 291 292 /** 293 * omap44xx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain 294 * 295 * Clear any previously-latched I/O wakeup events and ensure that the 296 * I/O wakeup gates are aligned with the current mux settings. Works 297 * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then 298 * deasserting WUCLKIN and waiting for WUCLKOUT to be deasserted. 299 * No return value. XXX Are the final two steps necessary? 300 */ 301 static void omap44xx_prm_reconfigure_io_chain(void) 302 { 303 int i = 0; 304 s32 inst = omap4_prmst_get_prm_dev_inst(); 305 306 if (inst == PRM_INSTANCE_UNKNOWN) 307 return; 308 309 /* Trigger WUCLKIN enable */ 310 omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK, 311 OMAP4430_WUCLK_CTRL_MASK, 312 inst, 313 omap4_prcm_irq_setup.pm_ctrl); 314 omap_test_timeout( 315 (((omap4_prm_read_inst_reg(inst, 316 omap4_prcm_irq_setup.pm_ctrl) & 317 OMAP4430_WUCLK_STATUS_MASK) >> 318 OMAP4430_WUCLK_STATUS_SHIFT) == 1), 319 MAX_IOPAD_LATCH_TIME, i); 320 if (i == MAX_IOPAD_LATCH_TIME) 321 pr_warn("PRM: I/O chain clock line assertion timed out\n"); 322 323 /* Trigger WUCLKIN disable */ 324 omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK, 0x0, 325 inst, 326 omap4_prcm_irq_setup.pm_ctrl); 327 omap_test_timeout( 328 (((omap4_prm_read_inst_reg(inst, 329 omap4_prcm_irq_setup.pm_ctrl) & 330 OMAP4430_WUCLK_STATUS_MASK) >> 331 OMAP4430_WUCLK_STATUS_SHIFT) == 0), 332 MAX_IOPAD_LATCH_TIME, i); 333 if (i == MAX_IOPAD_LATCH_TIME) 334 pr_warn("PRM: I/O chain clock line deassertion timed out\n"); 335 336 return; 337 } 338 339 /** 340 * omap44xx_prm_read_reset_sources - return the last SoC reset source 341 * 342 * Return a u32 representing the last reset sources of the SoC. The 343 * returned reset source bits are standardized across OMAP SoCs. 344 */ 345 static u32 omap44xx_prm_read_reset_sources(void) 346 { 347 struct prm_reset_src_map *p; 348 u32 r = 0; 349 u32 v; 350 s32 inst = omap4_prmst_get_prm_dev_inst(); 351 352 if (inst == PRM_INSTANCE_UNKNOWN) 353 return 0; 354 355 356 v = omap4_prm_read_inst_reg(inst, 357 OMAP4_RM_RSTST); 358 359 p = omap44xx_prm_reset_src_map; 360 while (p->reg_shift >= 0 && p->std_shift >= 0) { 361 if (v & (1 << p->reg_shift)) 362 r |= 1 << p->std_shift; 363 p++; 364 } 365 366 return r; 367 } 368 369 /** 370 * omap44xx_prm_was_any_context_lost_old - was module hardware context lost? 371 * @part: PRM partition ID (e.g., OMAP4430_PRM_PARTITION) 372 * @inst: PRM instance offset (e.g., OMAP4430_PRM_MPU_INST) 373 * @idx: CONTEXT register offset 374 * 375 * Return 1 if any bits were set in the *_CONTEXT_* register 376 * identified by (@part, @inst, @idx), which means that some context 377 * was lost for that module; otherwise, return 0. 378 */ 379 static bool omap44xx_prm_was_any_context_lost_old(u8 part, s16 inst, u16 idx) 380 { 381 return (omap4_prminst_read_inst_reg(part, inst, idx)) ? 1 : 0; 382 } 383 384 /** 385 * omap44xx_prm_clear_context_lost_flags_old - clear context loss flags 386 * @part: PRM partition ID (e.g., OMAP4430_PRM_PARTITION) 387 * @inst: PRM instance offset (e.g., OMAP4430_PRM_MPU_INST) 388 * @idx: CONTEXT register offset 389 * 390 * Clear hardware context loss bits for the module identified by 391 * (@part, @inst, @idx). No return value. XXX Writes to reserved bits; 392 * is there a way to avoid this? 393 */ 394 static void omap44xx_prm_clear_context_loss_flags_old(u8 part, s16 inst, 395 u16 idx) 396 { 397 omap4_prminst_write_inst_reg(0xffffffff, part, inst, idx); 398 } 399 400 /* Powerdomain low-level functions */ 401 402 static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) 403 { 404 omap4_prminst_rmw_inst_reg_bits(OMAP_POWERSTATE_MASK, 405 (pwrst << OMAP_POWERSTATE_SHIFT), 406 pwrdm->prcm_partition, 407 pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL); 408 return 0; 409 } 410 411 static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm) 412 { 413 u32 v; 414 415 v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs, 416 OMAP4_PM_PWSTCTRL); 417 v &= OMAP_POWERSTATE_MASK; 418 v >>= OMAP_POWERSTATE_SHIFT; 419 420 return v; 421 } 422 423 static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm) 424 { 425 u32 v; 426 427 v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs, 428 OMAP4_PM_PWSTST); 429 v &= OMAP_POWERSTATEST_MASK; 430 v >>= OMAP_POWERSTATEST_SHIFT; 431 432 return v; 433 } 434 435 static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) 436 { 437 u32 v; 438 439 v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs, 440 OMAP4_PM_PWSTST); 441 v &= OMAP4430_LASTPOWERSTATEENTERED_MASK; 442 v >>= OMAP4430_LASTPOWERSTATEENTERED_SHIFT; 443 444 return v; 445 } 446 447 static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm) 448 { 449 omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK, 450 (1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT), 451 pwrdm->prcm_partition, 452 pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL); 453 return 0; 454 } 455 456 static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) 457 { 458 omap4_prminst_rmw_inst_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK, 459 OMAP4430_LASTPOWERSTATEENTERED_MASK, 460 pwrdm->prcm_partition, 461 pwrdm->prcm_offs, OMAP4_PM_PWSTST); 462 return 0; 463 } 464 465 static int omap4_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) 466 { 467 u32 v; 468 469 v = pwrst << __ffs(OMAP4430_LOGICRETSTATE_MASK); 470 omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOGICRETSTATE_MASK, v, 471 pwrdm->prcm_partition, pwrdm->prcm_offs, 472 OMAP4_PM_PWSTCTRL); 473 474 return 0; 475 } 476 477 static int omap4_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, 478 u8 pwrst) 479 { 480 u32 m; 481 482 m = omap2_pwrdm_get_mem_bank_onstate_mask(bank); 483 484 omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)), 485 pwrdm->prcm_partition, pwrdm->prcm_offs, 486 OMAP4_PM_PWSTCTRL); 487 488 return 0; 489 } 490 491 static int omap4_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, 492 u8 pwrst) 493 { 494 u32 m; 495 496 m = omap2_pwrdm_get_mem_bank_retst_mask(bank); 497 498 omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)), 499 pwrdm->prcm_partition, pwrdm->prcm_offs, 500 OMAP4_PM_PWSTCTRL); 501 502 return 0; 503 } 504 505 static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) 506 { 507 u32 v; 508 509 v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs, 510 OMAP4_PM_PWSTST); 511 v &= OMAP4430_LOGICSTATEST_MASK; 512 v >>= OMAP4430_LOGICSTATEST_SHIFT; 513 514 return v; 515 } 516 517 static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm) 518 { 519 u32 v; 520 521 v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs, 522 OMAP4_PM_PWSTCTRL); 523 v &= OMAP4430_LOGICRETSTATE_MASK; 524 v >>= OMAP4430_LOGICRETSTATE_SHIFT; 525 526 return v; 527 } 528 529 /** 530 * omap4_pwrdm_read_prev_logic_pwrst - read the previous logic powerstate 531 * @pwrdm: struct powerdomain * to read the state for 532 * 533 * Reads the previous logic powerstate for a powerdomain. This 534 * function must determine the previous logic powerstate by first 535 * checking the previous powerstate for the domain. If that was OFF, 536 * then logic has been lost. If previous state was RETENTION, the 537 * function reads the setting for the next retention logic state to 538 * see the actual value. In every other case, the logic is 539 * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET 540 * depending whether the logic was retained or not. 541 */ 542 static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) 543 { 544 int state; 545 546 state = omap4_pwrdm_read_prev_pwrst(pwrdm); 547 548 if (state == PWRDM_POWER_OFF) 549 return PWRDM_POWER_OFF; 550 551 if (state != PWRDM_POWER_RET) 552 return PWRDM_POWER_RET; 553 554 return omap4_pwrdm_read_logic_retst(pwrdm); 555 } 556 557 static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) 558 { 559 u32 m, v; 560 561 m = omap2_pwrdm_get_mem_bank_stst_mask(bank); 562 563 v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs, 564 OMAP4_PM_PWSTST); 565 v &= m; 566 v >>= __ffs(m); 567 568 return v; 569 } 570 571 static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) 572 { 573 u32 m, v; 574 575 m = omap2_pwrdm_get_mem_bank_retst_mask(bank); 576 577 v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs, 578 OMAP4_PM_PWSTCTRL); 579 v &= m; 580 v >>= __ffs(m); 581 582 return v; 583 } 584 585 /** 586 * omap4_pwrdm_read_prev_mem_pwrst - reads the previous memory powerstate 587 * @pwrdm: struct powerdomain * to read mem powerstate for 588 * @bank: memory bank index 589 * 590 * Reads the previous memory powerstate for a powerdomain. This 591 * function must determine the previous memory powerstate by first 592 * checking the previous powerstate for the domain. If that was OFF, 593 * then logic has been lost. If previous state was RETENTION, the 594 * function reads the setting for the next memory retention state to 595 * see the actual value. In every other case, the logic is 596 * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET 597 * depending whether logic was retained or not. 598 */ 599 static int omap4_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) 600 { 601 int state; 602 603 state = omap4_pwrdm_read_prev_pwrst(pwrdm); 604 605 if (state == PWRDM_POWER_OFF) 606 return PWRDM_POWER_OFF; 607 608 if (state != PWRDM_POWER_RET) 609 return PWRDM_POWER_RET; 610 611 return omap4_pwrdm_read_mem_retst(pwrdm, bank); 612 } 613 614 static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm) 615 { 616 u32 c = 0; 617 618 /* 619 * REVISIT: pwrdm_wait_transition() may be better implemented 620 * via a callback and a periodic timer check -- how long do we expect 621 * powerdomain transitions to take? 622 */ 623 624 /* XXX Is this udelay() value meaningful? */ 625 while ((omap4_prminst_read_inst_reg(pwrdm->prcm_partition, 626 pwrdm->prcm_offs, 627 OMAP4_PM_PWSTST) & 628 OMAP_INTRANSITION_MASK) && 629 (c++ < PWRDM_TRANSITION_BAILOUT)) 630 udelay(1); 631 632 if (c > PWRDM_TRANSITION_BAILOUT) { 633 pr_err("powerdomain: %s: waited too long to complete transition\n", 634 pwrdm->name); 635 return -EAGAIN; 636 } 637 638 pr_debug("powerdomain: completed transition in %d loops\n", c); 639 640 return 0; 641 } 642 643 static int omap4_check_vcvp(void) 644 { 645 if (prm_features & PRM_HAS_VOLTAGE) 646 return 1; 647 648 return 0; 649 } 650 651 struct pwrdm_ops omap4_pwrdm_operations = { 652 .pwrdm_set_next_pwrst = omap4_pwrdm_set_next_pwrst, 653 .pwrdm_read_next_pwrst = omap4_pwrdm_read_next_pwrst, 654 .pwrdm_read_pwrst = omap4_pwrdm_read_pwrst, 655 .pwrdm_read_prev_pwrst = omap4_pwrdm_read_prev_pwrst, 656 .pwrdm_set_lowpwrstchange = omap4_pwrdm_set_lowpwrstchange, 657 .pwrdm_clear_all_prev_pwrst = omap4_pwrdm_clear_all_prev_pwrst, 658 .pwrdm_set_logic_retst = omap4_pwrdm_set_logic_retst, 659 .pwrdm_read_logic_pwrst = omap4_pwrdm_read_logic_pwrst, 660 .pwrdm_read_prev_logic_pwrst = omap4_pwrdm_read_prev_logic_pwrst, 661 .pwrdm_read_logic_retst = omap4_pwrdm_read_logic_retst, 662 .pwrdm_read_mem_pwrst = omap4_pwrdm_read_mem_pwrst, 663 .pwrdm_read_mem_retst = omap4_pwrdm_read_mem_retst, 664 .pwrdm_read_prev_mem_pwrst = omap4_pwrdm_read_prev_mem_pwrst, 665 .pwrdm_set_mem_onst = omap4_pwrdm_set_mem_onst, 666 .pwrdm_set_mem_retst = omap4_pwrdm_set_mem_retst, 667 .pwrdm_wait_transition = omap4_pwrdm_wait_transition, 668 .pwrdm_has_voltdm = omap4_check_vcvp, 669 }; 670 671 /* 672 * XXX document 673 */ 674 static struct prm_ll_data omap44xx_prm_ll_data = { 675 .read_reset_sources = &omap44xx_prm_read_reset_sources, 676 .was_any_context_lost_old = &omap44xx_prm_was_any_context_lost_old, 677 .clear_context_loss_flags_old = &omap44xx_prm_clear_context_loss_flags_old, 678 .assert_hardreset = omap4_prminst_assert_hardreset, 679 .deassert_hardreset = omap4_prminst_deassert_hardreset, 680 .is_hardreset_asserted = omap4_prminst_is_hardreset_asserted, 681 .reset_system = omap4_prminst_global_warm_sw_reset, 682 .vp_check_txdone = omap4_prm_vp_check_txdone, 683 .vp_clear_txdone = omap4_prm_vp_clear_txdone, 684 }; 685 686 static const struct omap_prcm_init_data *prm_init_data; 687 688 int __init omap44xx_prm_init(const struct omap_prcm_init_data *data) 689 { 690 omap_prm_base_init(); 691 692 prm_init_data = data; 693 694 if (data->flags & PRM_HAS_IO_WAKEUP) 695 prm_features |= PRM_HAS_IO_WAKEUP; 696 697 if (data->flags & PRM_HAS_VOLTAGE) 698 prm_features |= PRM_HAS_VOLTAGE; 699 700 omap4_prminst_set_prm_dev_inst(data->device_inst_offset); 701 702 /* Add AM437X specific differences */ 703 if (of_device_is_compatible(data->np, "ti,am4-prcm")) { 704 omap4_prcm_irq_setup.nr_irqs = 1; 705 omap4_prcm_irq_setup.nr_regs = 1; 706 omap4_prcm_irq_setup.pm_ctrl = AM43XX_PRM_IO_PMCTRL_OFFSET; 707 omap4_prcm_irq_setup.ack = AM43XX_PRM_IRQSTATUS_MPU_OFFSET; 708 omap4_prcm_irq_setup.mask = AM43XX_PRM_IRQENABLE_MPU_OFFSET; 709 } 710 711 return prm_register(&omap44xx_prm_ll_data); 712 } 713 714 static void __exit omap44xx_prm_exit(void) 715 { 716 prm_unregister(&omap44xx_prm_ll_data); 717 } 718 __exitcall(omap44xx_prm_exit); 719