arch/arm/mach-omap2/prm44xx.c

   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
  21
  22 #include "soc.h"
  23 #include "iomap.h"
  24 #include "common.h"
  25 #include "vp.h"
  26 #include "prm44xx.h"
  27 #include "prm-regbits-44xx.h"
  28 #include "prcm44xx.h"
  29 #include "prminst44xx.h"
  30 #include "powerdomain.h"
  31
  32 /* Static data */
  33
  34 static const struct omap_prcm_irq omap4_prcm_irqs[] = {
  35         OMAP_PRCM_IRQ("wkup",   0,      0),
  36         OMAP_PRCM_IRQ("io",     9,      1),
  37 };
  38
  39 static struct omap_prcm_irq_setup omap4_prcm_irq_setup = {
  40         .ack                    = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
  41         .mask                   = OMAP4_PRM_IRQENABLE_MPU_OFFSET,
  42         .nr_regs                = 2,
  43         .irqs                   = omap4_prcm_irqs,
  44         .nr_irqs                = ARRAY_SIZE(omap4_prcm_irqs),
  45         .irq                    = 11 + OMAP44XX_IRQ_GIC_START,
  46         .read_pending_irqs      = &omap44xx_prm_read_pending_irqs,
  47         .ocp_barrier            = &omap44xx_prm_ocp_barrier,
  48         .save_and_clear_irqen   = &omap44xx_prm_save_and_clear_irqen,
  49         .restore_irqen          = &omap44xx_prm_restore_irqen,
  50 };
  51
  52 /*
  53  * omap44xx_prm_reset_src_map - map from bits in the PRM_RSTST
  54  *   hardware register (which are specific to OMAP44xx SoCs) to reset
  55  *   source ID bit shifts (which is an OMAP SoC-independent
  56  *   enumeration)
  57  */
  58 static struct prm_reset_src_map omap44xx_prm_reset_src_map[] = {
  59         { OMAP4430_GLOBAL_WARM_SW_RST_SHIFT,
  60           OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
  61         { OMAP4430_GLOBAL_COLD_RST_SHIFT,
  62           OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
  63         { OMAP4430_MPU_SECURITY_VIOL_RST_SHIFT,
  64           OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
  65         { OMAP4430_MPU_WDT_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
  66         { OMAP4430_SECURE_WDT_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
  67         { OMAP4430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
  68         { OMAP4430_VDD_MPU_VOLT_MGR_RST_SHIFT,
  69           OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT },
  70         { OMAP4430_VDD_IVA_VOLT_MGR_RST_SHIFT,
  71           OMAP_VDD_IVA_VM_RST_SRC_ID_SHIFT },
  72         { OMAP4430_VDD_CORE_VOLT_MGR_RST_SHIFT,
  73           OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT },
  74         { OMAP4430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT },
  75         { OMAP4430_C2C_RST_SHIFT, OMAP_C2C_RST_SRC_ID_SHIFT },
  76         { -1, -1 },
  77 };
  78
  79 /* PRM low-level functions */
  80
  81 /* Read a register in a CM/PRM instance in the PRM module */
  82 u32 omap4_prm_read_inst_reg(s16 inst, u16 reg)
  83 {
  84         return __raw_readl(OMAP44XX_PRM_REGADDR(inst, reg));
  85 }
  86
  87 /* Write into a register in a CM/PRM instance in the PRM module */
  88 void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg)
  89 {
  90         __raw_writel(val, OMAP44XX_PRM_REGADDR(inst, reg));
  91 }
  92
  93 /* Read-modify-write a register in a PRM module. Caller must lock */
  94 u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg)
  95 {
  96         u32 v;
  97
  98         v = omap4_prm_read_inst_reg(inst, reg);
  99         v &= ~mask;
 100         v |= bits;
 101         omap4_prm_write_inst_reg(v, inst, reg);
 102
 103         return v;
 104 }
 105
 106 /* PRM VP */
 107
 108 /*
 109  * struct omap4_vp - OMAP4 VP register access description.
 110  * @irqstatus_mpu: offset to IRQSTATUS_MPU register for VP
 111  * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
 112  */
 113 struct omap4_vp {
 114         u32 irqstatus_mpu;
 115         u32 tranxdone_status;
 116 };
 117
 118 static struct omap4_vp omap4_vp[] = {
 119         [OMAP4_VP_VDD_MPU_ID] = {
 120                 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET,
 121                 .tranxdone_status = OMAP4430_VP_MPU_TRANXDONE_ST_MASK,
 122         },
 123         [OMAP4_VP_VDD_IVA_ID] = {
 124                 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
 125                 .tranxdone_status = OMAP4430_VP_IVA_TRANXDONE_ST_MASK,
 126         },
 127         [OMAP4_VP_VDD_CORE_ID] = {
 128                 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
 129                 .tranxdone_status = OMAP4430_VP_CORE_TRANXDONE_ST_MASK,
 130         },
 131 };
 132
 133 u32 omap4_prm_vp_check_txdone(u8 vp_id)
 134 {
 135         struct omap4_vp *vp = &omap4_vp[vp_id];
 136         u32 irqstatus;
 137
 138         irqstatus = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
 139                                                 OMAP4430_PRM_OCP_SOCKET_INST,
 140                                                 vp->irqstatus_mpu);
 141         return irqstatus & vp->tranxdone_status;
 142 }
 143
 144 void omap4_prm_vp_clear_txdone(u8 vp_id)
 145 {
 146         struct omap4_vp *vp = &omap4_vp[vp_id];
 147
 148         omap4_prminst_write_inst_reg(vp->tranxdone_status,
 149                                      OMAP4430_PRM_PARTITION,
 150                                      OMAP4430_PRM_OCP_SOCKET_INST,
 151                                      vp->irqstatus_mpu);
 152 };
 153
 154 u32 omap4_prm_vcvp_read(u8 offset)
 155 {
 156         return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
 157                                            OMAP4430_PRM_DEVICE_INST, offset);
 158 }
 159
 160 void omap4_prm_vcvp_write(u32 val, u8 offset)
 161 {
 162         omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION,
 163                                      OMAP4430_PRM_DEVICE_INST, offset);
 164 }
 165
 166 u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
 167 {
 168         return omap4_prminst_rmw_inst_reg_bits(mask, bits,
 169                                                OMAP4430_PRM_PARTITION,
 170                                                OMAP4430_PRM_DEVICE_INST,
 171                                                offset);
 172 }
 173
 174 static inline u32 _read_pending_irq_reg(u16 irqen_offs, u16 irqst_offs)
 175 {
 176         u32 mask, st;
 177
 178         /* XXX read mask from RAM? */
 179         mask = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
 180                                        irqen_offs);
 181         st = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST, irqst_offs);
 182
 183         return mask & st;
 184 }
 185
 186 /**
 187  * omap44xx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
 188  * @events: ptr to two consecutive u32s, preallocated by caller
 189  *
 190  * Read PRM_IRQSTATUS_MPU* bits, AND'ed with the currently-enabled PRM
 191  * MPU IRQs, and store the result into the two u32s pointed to by @events.
 192  * No return value.
 193  */
 194 void omap44xx_prm_read_pending_irqs(unsigned long *events)
 195 {
 196         events[0] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_OFFSET,
 197                                           OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
 198
 199         events[1] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_2_OFFSET,
 200                                           OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
 201 }
 202
 203 /**
 204  * omap44xx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
 205  *
 206  * Force any buffered writes to the PRM IP block to complete.  Needed
 207  * by the PRM IRQ handler, which reads and writes directly to the IP
 208  * block, to avoid race conditions after acknowledging or clearing IRQ
 209  * bits.  No return value.
 210  */
 211 void omap44xx_prm_ocp_barrier(void)
 212 {
 213         omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
 214                                 OMAP4_REVISION_PRM_OFFSET);
 215 }
 216
 217 /**
 218  * omap44xx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU* regs
 219  * @saved_mask: ptr to a u32 array to save IRQENABLE bits
 220  *
 221  * Save the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers to
 222  * @saved_mask.  @saved_mask must be allocated by the caller.
 223  * Intended to be used in the PRM interrupt handler suspend callback.
 224  * The OCP barrier is needed to ensure the write to disable PRM
 225  * interrupts reaches the PRM before returning; otherwise, spurious
 226  * interrupts might occur.  No return value.
 227  */
 228 void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask)
 229 {
 230         saved_mask[0] =
 231                 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
 232                                         OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
 233         saved_mask[1] =
 234                 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
 235                                         OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
 236
 237         omap4_prm_write_inst_reg(0, OMAP4430_PRM_OCP_SOCKET_INST,
 238                                  OMAP4_PRM_IRQENABLE_MPU_OFFSET);
 239         omap4_prm_write_inst_reg(0, OMAP4430_PRM_OCP_SOCKET_INST,
 240                                  OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
 241
 242         /* OCP barrier */
 243         omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
 244                                 OMAP4_REVISION_PRM_OFFSET);
 245 }
 246
 247 /**
 248  * omap44xx_prm_restore_irqen - set PRM_IRQENABLE_MPU* registers from args
 249  * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
 250  *
 251  * Restore the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers from
 252  * @saved_mask.  Intended to be used in the PRM interrupt handler resume
 253  * callback to restore values saved by omap44xx_prm_save_and_clear_irqen().
 254  * No OCP barrier should be needed here; any pending PRM interrupts will fire
 255  * once the writes reach the PRM.  No return value.
 256  */
 257 void omap44xx_prm_restore_irqen(u32 *saved_mask)
 258 {
 259         omap4_prm_write_inst_reg(saved_mask[0], OMAP4430_PRM_OCP_SOCKET_INST,
 260                                  OMAP4_PRM_IRQENABLE_MPU_OFFSET);
 261         omap4_prm_write_inst_reg(saved_mask[1], OMAP4430_PRM_OCP_SOCKET_INST,
 262                                  OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
 263 }
 264
 265 /**
 266  * omap44xx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
 267  *
 268  * Clear any previously-latched I/O wakeup events and ensure that the
 269  * I/O wakeup gates are aligned with the current mux settings.  Works
 270  * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then
 271  * deasserting WUCLKIN and waiting for WUCLKOUT to be deasserted.
 272  * No return value. XXX Are the final two steps necessary?
 273  */
 274 void omap44xx_prm_reconfigure_io_chain(void)
 275 {
 276         int i = 0;
 277
 278         /* Trigger WUCLKIN enable */
 279         omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK,
 280                                     OMAP4430_WUCLK_CTRL_MASK,
 281                                     OMAP4430_PRM_DEVICE_INST,
 282                                     OMAP4_PRM_IO_PMCTRL_OFFSET);
 283         omap_test_timeout(
 284                 (((omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
 285                                            OMAP4_PRM_IO_PMCTRL_OFFSET) &
 286                    OMAP4430_WUCLK_STATUS_MASK) >>
 287                   OMAP4430_WUCLK_STATUS_SHIFT) == 1),
 288                 MAX_IOPAD_LATCH_TIME, i);
 289         if (i == MAX_IOPAD_LATCH_TIME)
 290                 pr_warn("PRM: I/O chain clock line assertion timed out\n");
 291
 292         /* Trigger WUCLKIN disable */
 293         omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK, 0x0,
 294                                     OMAP4430_PRM_DEVICE_INST,
 295                                     OMAP4_PRM_IO_PMCTRL_OFFSET);
 296         omap_test_timeout(
 297                 (((omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
 298                                            OMAP4_PRM_IO_PMCTRL_OFFSET) &
 299                    OMAP4430_WUCLK_STATUS_MASK) >>
 300                   OMAP4430_WUCLK_STATUS_SHIFT) == 0),
 301                 MAX_IOPAD_LATCH_TIME, i);
 302         if (i == MAX_IOPAD_LATCH_TIME)
 303                 pr_warn("PRM: I/O chain clock line deassertion timed out\n");
 304
 305         return;
 306 }
 307
 308 /**
 309  * omap44xx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
 310  *
 311  * Activates the I/O wakeup event latches and allows events logged by
 312  * those latches to signal a wakeup event to the PRCM.  For I/O wakeups
 313  * to occur, WAKEUPENABLE bits must be set in the pad mux registers, and
 314  * omap44xx_prm_reconfigure_io_chain() must be called.  No return value.
 315  */
 316 static void __init omap44xx_prm_enable_io_wakeup(void)
 317 {
 318         omap4_prm_rmw_inst_reg_bits(OMAP4430_GLOBAL_WUEN_MASK,
 319                                     OMAP4430_GLOBAL_WUEN_MASK,
 320                                     OMAP4430_PRM_DEVICE_INST,
 321                                     OMAP4_PRM_IO_PMCTRL_OFFSET);
 322 }
 323
 324 /**
 325  * omap44xx_prm_read_reset_sources - return the last SoC reset source
 326  *
 327  * Return a u32 representing the last reset sources of the SoC.  The
 328  * returned reset source bits are standardized across OMAP SoCs.
 329  */
 330 static u32 omap44xx_prm_read_reset_sources(void)
 331 {
 332         struct prm_reset_src_map *p;
 333         u32 r = 0;
 334         u32 v;
 335
 336         v = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
 337                                     OMAP4_RM_RSTST);
 338
 339         p = omap44xx_prm_reset_src_map;
 340         while (p->reg_shift >= 0 && p->std_shift >= 0) {
 341                 if (v & (1 << p->reg_shift))
 342                         r |= 1 << p->std_shift;
 343                 p++;
 344         }
 345
 346         return r;
 347 }
 348
 349 /**
 350  * omap44xx_prm_was_any_context_lost_old - was module hardware context lost?
 351  * @part: PRM partition ID (e.g., OMAP4430_PRM_PARTITION)
 352  * @inst: PRM instance offset (e.g., OMAP4430_PRM_MPU_INST)
 353  * @idx: CONTEXT register offset
 354  *
 355  * Return 1 if any bits were set in the *_CONTEXT_* register
 356  * identified by (@part, @inst, @idx), which means that some context
 357  * was lost for that module; otherwise, return 0.
 358  */
 359 static bool omap44xx_prm_was_any_context_lost_old(u8 part, s16 inst, u16 idx)
 360 {
 361         return (omap4_prminst_read_inst_reg(part, inst, idx)) ? 1 : 0;
 362 }
 363
 364 /**
 365  * omap44xx_prm_clear_context_lost_flags_old - clear context loss flags
 366  * @part: PRM partition ID (e.g., OMAP4430_PRM_PARTITION)
 367  * @inst: PRM instance offset (e.g., OMAP4430_PRM_MPU_INST)
 368  * @idx: CONTEXT register offset
 369  *
 370  * Clear hardware context loss bits for the module identified by
 371  * (@part, @inst, @idx).  No return value.  XXX Writes to reserved bits;
 372  * is there a way to avoid this?
 373  */
 374 static void omap44xx_prm_clear_context_loss_flags_old(u8 part, s16 inst,
 375                                                       u16 idx)
 376 {
 377         omap4_prminst_write_inst_reg(0xffffffff, part, inst, idx);
 378 }
 379
 380 /* Powerdomain low-level functions */
 381
 382 static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
 383 {
 384         omap4_prminst_rmw_inst_reg_bits(OMAP_POWERSTATE_MASK,
 385                                         (pwrst << OMAP_POWERSTATE_SHIFT),
 386                                         pwrdm->prcm_partition,
 387                                         pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
 388         return 0;
 389 }
 390
 391 static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
 392 {
 393         u32 v;
 394
 395         v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
 396                                         OMAP4_PM_PWSTCTRL);
 397         v &= OMAP_POWERSTATE_MASK;
 398         v >>= OMAP_POWERSTATE_SHIFT;
 399
 400         return v;
 401 }
 402
 403 static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm)
 404 {
 405         u32 v;
 406
 407         v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
 408                                         OMAP4_PM_PWSTST);
 409         v &= OMAP_POWERSTATEST_MASK;
 410         v >>= OMAP_POWERSTATEST_SHIFT;
 411
 412         return v;
 413 }
 414
 415 static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
 416 {
 417         u32 v;
 418
 419         v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
 420                                         OMAP4_PM_PWSTST);
 421         v &= OMAP4430_LASTPOWERSTATEENTERED_MASK;
 422         v >>= OMAP4430_LASTPOWERSTATEENTERED_SHIFT;
 423
 424         return v;
 425 }
 426
 427 static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
 428 {
 429         omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
 430                                         (1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
 431                                         pwrdm->prcm_partition,
 432                                         pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
 433         return 0;
 434 }
 435
 436 static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
 437 {
 438         omap4_prminst_rmw_inst_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK,
 439                                         OMAP4430_LASTPOWERSTATEENTERED_MASK,
 440                                         pwrdm->prcm_partition,
 441                                         pwrdm->prcm_offs, OMAP4_PM_PWSTST);
 442         return 0;
 443 }
 444
 445 static int omap4_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
 446 {
 447         u32 v;
 448
 449         v = pwrst << __ffs(OMAP4430_LOGICRETSTATE_MASK);
 450         omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOGICRETSTATE_MASK, v,
 451                                         pwrdm->prcm_partition, pwrdm->prcm_offs,
 452                                         OMAP4_PM_PWSTCTRL);
 453
 454         return 0;
 455 }
 456
 457 static int omap4_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
 458                                     u8 pwrst)
 459 {
 460         u32 m;
 461
 462         m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
 463
 464         omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
 465                                         pwrdm->prcm_partition, pwrdm->prcm_offs,
 466                                         OMAP4_PM_PWSTCTRL);
 467
 468         return 0;
 469 }
 470
 471 static int omap4_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
 472                                      u8 pwrst)
 473 {
 474         u32 m;
 475
 476         m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
 477
 478         omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
 479                                         pwrdm->prcm_partition, pwrdm->prcm_offs,
 480                                         OMAP4_PM_PWSTCTRL);
 481
 482         return 0;
 483 }
 484
 485 static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
 486 {
 487         u32 v;
 488
 489         v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
 490                                         OMAP4_PM_PWSTST);
 491         v &= OMAP4430_LOGICSTATEST_MASK;
 492         v >>= OMAP4430_LOGICSTATEST_SHIFT;
 493
 494         return v;
 495 }
 496
 497 static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
 498 {
 499         u32 v;
 500
 501         v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
 502                                         OMAP4_PM_PWSTCTRL);
 503         v &= OMAP4430_LOGICRETSTATE_MASK;
 504         v >>= OMAP4430_LOGICRETSTATE_SHIFT;
 505
 506         return v;
 507 }
 508
 509 /**
 510  * omap4_pwrdm_read_prev_logic_pwrst - read the previous logic powerstate
 511  * @pwrdm: struct powerdomain * to read the state for
 512  *
 513  * Reads the previous logic powerstate for a powerdomain. This
 514  * function must determine the previous logic powerstate by first
 515  * checking the previous powerstate for the domain. If that was OFF,
 516  * then logic has been lost. If previous state was RETENTION, the
 517  * function reads the setting for the next retention logic state to
 518  * see the actual value.  In every other case, the logic is
 519  * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
 520  * depending whether the logic was retained or not.
 521  */
 522 static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
 523 {
 524         int state;
 525
 526         state = omap4_pwrdm_read_prev_pwrst(pwrdm);
 527
 528         if (state == PWRDM_POWER_OFF)
 529                 return PWRDM_POWER_OFF;
 530
 531         if (state != PWRDM_POWER_RET)
 532                 return PWRDM_POWER_RET;
 533
 534         return omap4_pwrdm_read_logic_retst(pwrdm);
 535 }
 536
 537 static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 538 {
 539         u32 m, v;
 540
 541         m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
 542
 543         v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
 544                                         OMAP4_PM_PWSTST);
 545         v &= m;
 546         v >>= __ffs(m);
 547
 548         return v;
 549 }
 550
 551 static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
 552 {
 553         u32 m, v;
 554
 555         m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
 556
 557         v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
 558                                         OMAP4_PM_PWSTCTRL);
 559         v &= m;
 560         v >>= __ffs(m);
 561
 562         return v;
 563 }
 564
 565 /**
 566  * omap4_pwrdm_read_prev_mem_pwrst - reads the previous memory powerstate
 567  * @pwrdm: struct powerdomain * to read mem powerstate for
 568  * @bank: memory bank index
 569  *
 570  * Reads the previous memory powerstate for a powerdomain. This
 571  * function must determine the previous memory powerstate by first
 572  * checking the previous powerstate for the domain. If that was OFF,
 573  * then logic has been lost. If previous state was RETENTION, the
 574  * function reads the setting for the next memory retention state to
 575  * see the actual value.  In every other case, the logic is
 576  * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
 577  * depending whether logic was retained or not.
 578  */
 579 static int omap4_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 580 {
 581         int state;
 582
 583         state = omap4_pwrdm_read_prev_pwrst(pwrdm);
 584
 585         if (state == PWRDM_POWER_OFF)
 586                 return PWRDM_POWER_OFF;
 587
 588         if (state != PWRDM_POWER_RET)
 589                 return PWRDM_POWER_RET;
 590
 591         return omap4_pwrdm_read_mem_retst(pwrdm, bank);
 592 }
 593
 594 static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm)
 595 {
 596         u32 c = 0;
 597
 598         /*
 599          * REVISIT: pwrdm_wait_transition() may be better implemented
 600          * via a callback and a periodic timer check -- how long do we expect
 601          * powerdomain transitions to take?
 602          */
 603
 604         /* XXX Is this udelay() value meaningful? */
 605         while ((omap4_prminst_read_inst_reg(pwrdm->prcm_partition,
 606                                             pwrdm->prcm_offs,
 607                                             OMAP4_PM_PWSTST) &
 608                 OMAP_INTRANSITION_MASK) &&
 609                (c++ < PWRDM_TRANSITION_BAILOUT))
 610                 udelay(1);
 611
 612         if (c > PWRDM_TRANSITION_BAILOUT) {
 613                 pr_err("powerdomain: %s: waited too long to complete transition\n",
 614                        pwrdm->name);
 615                 return -EAGAIN;
 616         }
 617
 618         pr_debug("powerdomain: completed transition in %d loops\n", c);
 619
 620         return 0;
 621 }
 622
 623 struct pwrdm_ops omap4_pwrdm_operations = {
 624         .pwrdm_set_next_pwrst   = omap4_pwrdm_set_next_pwrst,
 625         .pwrdm_read_next_pwrst  = omap4_pwrdm_read_next_pwrst,
 626         .pwrdm_read_pwrst       = omap4_pwrdm_read_pwrst,
 627         .pwrdm_read_prev_pwrst  = omap4_pwrdm_read_prev_pwrst,
 628         .pwrdm_set_lowpwrstchange       = omap4_pwrdm_set_lowpwrstchange,
 629         .pwrdm_clear_all_prev_pwrst     = omap4_pwrdm_clear_all_prev_pwrst,
 630         .pwrdm_set_logic_retst  = omap4_pwrdm_set_logic_retst,
 631         .pwrdm_read_logic_pwrst = omap4_pwrdm_read_logic_pwrst,
 632         .pwrdm_read_prev_logic_pwrst    = omap4_pwrdm_read_prev_logic_pwrst,
 633         .pwrdm_read_logic_retst = omap4_pwrdm_read_logic_retst,
 634         .pwrdm_read_mem_pwrst   = omap4_pwrdm_read_mem_pwrst,
 635         .pwrdm_read_mem_retst   = omap4_pwrdm_read_mem_retst,
 636         .pwrdm_read_prev_mem_pwrst      = omap4_pwrdm_read_prev_mem_pwrst,
 637         .pwrdm_set_mem_onst     = omap4_pwrdm_set_mem_onst,
 638         .pwrdm_set_mem_retst    = omap4_pwrdm_set_mem_retst,
 639         .pwrdm_wait_transition  = omap4_pwrdm_wait_transition,
 640 };
 641
 642 /*
 643  * XXX document
 644  */
 645 static struct prm_ll_data omap44xx_prm_ll_data = {
 646         .read_reset_sources = &omap44xx_prm_read_reset_sources,
 647         .was_any_context_lost_old = &omap44xx_prm_was_any_context_lost_old,
 648         .clear_context_loss_flags_old = &omap44xx_prm_clear_context_loss_flags_old,
 649 };
 650
 651 int __init omap44xx_prm_init(void)
 652 {
 653         if (!cpu_is_omap44xx())
 654                 return 0;
 655
 656         return prm_register(&omap44xx_prm_ll_data);
 657 }
 658
 659 static int __init omap44xx_prm_late_init(void)
 660 {
 661         if (!cpu_is_omap44xx())
 662                 return 0;
 663
 664         omap44xx_prm_enable_io_wakeup();
 665
 666         return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
 667 }
 668 subsys_initcall(omap44xx_prm_late_init);
 669
 670 static void __exit omap44xx_prm_exit(void)
 671 {
 672         if (!cpu_is_omap44xx())
 673                 return;
 674
 675         /* Should never happen */
 676         WARN(prm_unregister(&omap44xx_prm_ll_data),
 677              "%s: prm_ll_data function pointer mismatch\n", __func__);
 678 }
 679 __exitcall(omap44xx_prm_exit);