arch/arm/mach-omap2/prm3xxx.c

   1 /*
   2  * OMAP3xxx PRM module functions
   3  *
   4  * Copyright (C) 2010-2012 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/errno.h>
  17 #include <linux/err.h>
  18 #include <linux/io.h>
  19 #include <linux/irq.h>
  20
  21 #include "soc.h"
  22 #include "common.h"
  23 #include "vp.h"
  24 #include "powerdomain.h"
  25 #include "prm3xxx.h"
  26 #include "prm2xxx_3xxx.h"
  27 #include "cm2xxx_3xxx.h"
  28 #include "prm-regbits-34xx.h"
  29 #include "cm3xxx.h"
  30 #include "cm-regbits-34xx.h"
  31
  32 static const struct omap_prcm_irq omap3_prcm_irqs[] = {
  33         OMAP_PRCM_IRQ("wkup",   0,      0),
  34         OMAP_PRCM_IRQ("io",     9,      1),
  35 };
  36
  37 static struct omap_prcm_irq_setup omap3_prcm_irq_setup = {
  38         .ack                    = OMAP3_PRM_IRQSTATUS_MPU_OFFSET,
  39         .mask                   = OMAP3_PRM_IRQENABLE_MPU_OFFSET,
  40         .nr_regs                = 1,
  41         .irqs                   = omap3_prcm_irqs,
  42         .nr_irqs                = ARRAY_SIZE(omap3_prcm_irqs),
  43         .irq                    = 11 + OMAP_INTC_START,
  44         .read_pending_irqs      = &omap3xxx_prm_read_pending_irqs,
  45         .ocp_barrier            = &omap3xxx_prm_ocp_barrier,
  46         .save_and_clear_irqen   = &omap3xxx_prm_save_and_clear_irqen,
  47         .restore_irqen          = &omap3xxx_prm_restore_irqen,
  48         .reconfigure_io_chain   = NULL,
  49 };
  50
  51 /*
  52  * omap3_prm_reset_src_map - map from bits in the PRM_RSTST hardware
  53  *   register (which are specific to OMAP3xxx SoCs) to reset source ID
  54  *   bit shifts (which is an OMAP SoC-independent enumeration)
  55  */
  56 static struct prm_reset_src_map omap3xxx_prm_reset_src_map[] = {
  57         { OMAP3430_GLOBAL_COLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
  58         { OMAP3430_GLOBAL_SW_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
  59         { OMAP3430_SECURITY_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
  60         { OMAP3430_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
  61         { OMAP3430_SECURE_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
  62         { OMAP3430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
  63         { OMAP3430_VDD1_VOLTAGE_MANAGER_RST_SHIFT,
  64           OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT },
  65         { OMAP3430_VDD2_VOLTAGE_MANAGER_RST_SHIFT,
  66           OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT },
  67         { OMAP3430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT },
  68         { OMAP3430_ICECRUSHER_RST_SHIFT, OMAP_ICECRUSHER_RST_SRC_ID_SHIFT },
  69         { -1, -1 },
  70 };
  71
  72 /* PRM VP */
  73
  74 /*
  75  * struct omap3_vp - OMAP3 VP register access description.
  76  * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
  77  */
  78 struct omap3_vp {
  79         u32 tranxdone_status;
  80 };
  81
  82 static struct omap3_vp omap3_vp[] = {
  83         [OMAP3_VP_VDD_MPU_ID] = {
  84                 .tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK,
  85         },
  86         [OMAP3_VP_VDD_CORE_ID] = {
  87                 .tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK,
  88         },
  89 };
  90
  91 #define MAX_VP_ID ARRAY_SIZE(omap3_vp);
  92
  93 u32 omap3_prm_vp_check_txdone(u8 vp_id)
  94 {
  95         struct omap3_vp *vp = &omap3_vp[vp_id];
  96         u32 irqstatus;
  97
  98         irqstatus = omap2_prm_read_mod_reg(OCP_MOD,
  99                                            OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 100         return irqstatus & vp->tranxdone_status;
 101 }
 102
 103 void omap3_prm_vp_clear_txdone(u8 vp_id)
 104 {
 105         struct omap3_vp *vp = &omap3_vp[vp_id];
 106
 107         omap2_prm_write_mod_reg(vp->tranxdone_status,
 108                                 OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 109 }
 110
 111 u32 omap3_prm_vcvp_read(u8 offset)
 112 {
 113         return omap2_prm_read_mod_reg(OMAP3430_GR_MOD, offset);
 114 }
 115
 116 void omap3_prm_vcvp_write(u32 val, u8 offset)
 117 {
 118         omap2_prm_write_mod_reg(val, OMAP3430_GR_MOD, offset);
 119 }
 120
 121 u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
 122 {
 123         return omap2_prm_rmw_mod_reg_bits(mask, bits, OMAP3430_GR_MOD, offset);
 124 }
 125
 126 /**
 127  * omap3xxx_prm_dpll3_reset - use DPLL3 reset to reboot the OMAP SoC
 128  *
 129  * Set the DPLL3 reset bit, which should reboot the SoC.  This is the
 130  * recommended way to restart the SoC, considering Errata i520.  No
 131  * return value.
 132  */
 133 void omap3xxx_prm_dpll3_reset(void)
 134 {
 135         omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, OMAP3430_GR_MOD,
 136                                    OMAP2_RM_RSTCTRL);
 137         /* OCP barrier */
 138         omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP2_RM_RSTCTRL);
 139 }
 140
 141 /**
 142  * omap3xxx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
 143  * @events: ptr to a u32, preallocated by caller
 144  *
 145  * Read PRM_IRQSTATUS_MPU bits, AND'ed with the currently-enabled PRM
 146  * MPU IRQs, and store the result into the u32 pointed to by @events.
 147  * No return value.
 148  */
 149 void omap3xxx_prm_read_pending_irqs(unsigned long *events)
 150 {
 151         u32 mask, st;
 152
 153         /* XXX Can the mask read be avoided (e.g., can it come from RAM?) */
 154         mask = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 155         st = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 156
 157         events[0] = mask & st;
 158 }
 159
 160 /**
 161  * omap3xxx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
 162  *
 163  * Force any buffered writes to the PRM IP block to complete.  Needed
 164  * by the PRM IRQ handler, which reads and writes directly to the IP
 165  * block, to avoid race conditions after acknowledging or clearing IRQ
 166  * bits.  No return value.
 167  */
 168 void omap3xxx_prm_ocp_barrier(void)
 169 {
 170         omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
 171 }
 172
 173 /**
 174  * omap3xxx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU reg
 175  * @saved_mask: ptr to a u32 array to save IRQENABLE bits
 176  *
 177  * Save the PRM_IRQENABLE_MPU register to @saved_mask.  @saved_mask
 178  * must be allocated by the caller.  Intended to be used in the PRM
 179  * interrupt handler suspend callback.  The OCP barrier is needed to
 180  * ensure the write to disable PRM interrupts reaches the PRM before
 181  * returning; otherwise, spurious interrupts might occur.  No return
 182  * value.
 183  */
 184 void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask)
 185 {
 186         saved_mask[0] = omap2_prm_read_mod_reg(OCP_MOD,
 187                                                OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 188         omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 189
 190         /* OCP barrier */
 191         omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
 192 }
 193
 194 /**
 195  * omap3xxx_prm_restore_irqen - set PRM_IRQENABLE_MPU register from args
 196  * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
 197  *
 198  * Restore the PRM_IRQENABLE_MPU register from @saved_mask.  Intended
 199  * to be used in the PRM interrupt handler resume callback to restore
 200  * values saved by omap3xxx_prm_save_and_clear_irqen().  No OCP
 201  * barrier should be needed here; any pending PRM interrupts will fire
 202  * once the writes reach the PRM.  No return value.
 203  */
 204 void omap3xxx_prm_restore_irqen(u32 *saved_mask)
 205 {
 206         omap2_prm_write_mod_reg(saved_mask[0], OCP_MOD,
 207                                 OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 208 }
 209
 210 /**
 211  * omap3xxx_prm_clear_mod_irqs - clear wake-up events from PRCM interrupt
 212  * @module: PRM module to clear wakeups from
 213  * @regs: register set to clear, 1 or 3
 214  * @ignore_bits: wakeup status bits to ignore
 215  *
 216  * The purpose of this function is to clear any wake-up events latched
 217  * in the PRCM PM_WKST_x registers. It is possible that a wake-up event
 218  * may occur whilst attempting to clear a PM_WKST_x register and thus
 219  * set another bit in this register. A while loop is used to ensure
 220  * that any peripheral wake-up events occurring while attempting to
 221  * clear the PM_WKST_x are detected and cleared.
 222  */
 223 int omap3xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits)
 224 {
 225         u32 wkst, fclk, iclk, clken;
 226         u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
 227         u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
 228         u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
 229         u16 grpsel_off = (regs == 3) ?
 230                 OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
 231         int c = 0;
 232
 233         wkst = omap2_prm_read_mod_reg(module, wkst_off);
 234         wkst &= omap2_prm_read_mod_reg(module, grpsel_off);
 235         wkst &= ~ignore_bits;
 236         if (wkst) {
 237                 iclk = omap2_cm_read_mod_reg(module, iclk_off);
 238                 fclk = omap2_cm_read_mod_reg(module, fclk_off);
 239                 while (wkst) {
 240                         clken = wkst;
 241                         omap2_cm_set_mod_reg_bits(clken, module, iclk_off);
 242                         /*
 243                          * For USBHOST, we don't know whether HOST1 or
 244                          * HOST2 woke us up, so enable both f-clocks
 245                          */
 246                         if (module == OMAP3430ES2_USBHOST_MOD)
 247                                 clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
 248                         omap2_cm_set_mod_reg_bits(clken, module, fclk_off);
 249                         omap2_prm_write_mod_reg(wkst, module, wkst_off);
 250                         wkst = omap2_prm_read_mod_reg(module, wkst_off);
 251                         wkst &= ~ignore_bits;
 252                         c++;
 253                 }
 254                 omap2_cm_write_mod_reg(iclk, module, iclk_off);
 255                 omap2_cm_write_mod_reg(fclk, module, fclk_off);
 256         }
 257
 258         return c;
 259 }
 260
 261 /**
 262  * omap3_prm_reset_modem - toggle reset signal for modem
 263  *
 264  * Toggles the reset signal to modem IP block. Required to allow
 265  * OMAP3430 without stacked modem to idle properly.
 266  */
 267 void __init omap3_prm_reset_modem(void)
 268 {
 269         omap2_prm_write_mod_reg(
 270                 OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK |
 271                 OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK,
 272                                 CORE_MOD, OMAP2_RM_RSTCTRL);
 273         omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL);
 274 }
 275
 276 /**
 277  * omap3_prm_init_pm - initialize PM related registers for PRM
 278  * @has_uart4: SoC has UART4
 279  * @has_iva: SoC has IVA
 280  *
 281  * Initializes PRM registers for PM use. Called from PM init.
 282  */
 283 void __init omap3_prm_init_pm(bool has_uart4, bool has_iva)
 284 {
 285         u32 en_uart4_mask;
 286         u32 grpsel_uart4_mask;
 287
 288         /*
 289          * Enable control of expternal oscillator through
 290          * sys_clkreq. In the long run clock framework should
 291          * take care of this.
 292          */
 293         omap2_prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
 294                                    1 << OMAP_AUTOEXTCLKMODE_SHIFT,
 295                                    OMAP3430_GR_MOD,
 296                                    OMAP3_PRM_CLKSRC_CTRL_OFFSET);
 297
 298         /* setup wakup source */
 299         omap2_prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK |
 300                                 OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK,
 301                                 WKUP_MOD, PM_WKEN);
 302         /* No need to write EN_IO, that is always enabled */
 303         omap2_prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK |
 304                                 OMAP3430_GRPSEL_GPT1_MASK |
 305                                 OMAP3430_GRPSEL_GPT12_MASK,
 306                                 WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
 307
 308         /* Enable PM_WKEN to support DSS LPR */
 309         omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK,
 310                                 OMAP3430_DSS_MOD, PM_WKEN);
 311
 312         if (has_uart4) {
 313                 en_uart4_mask = OMAP3630_EN_UART4_MASK;
 314                 grpsel_uart4_mask = OMAP3630_GRPSEL_UART4_MASK;
 315         }
 316
 317         /* Enable wakeups in PER */
 318         omap2_prm_write_mod_reg(en_uart4_mask |
 319                                 OMAP3430_EN_GPIO2_MASK |
 320                                 OMAP3430_EN_GPIO3_MASK |
 321                                 OMAP3430_EN_GPIO4_MASK |
 322                                 OMAP3430_EN_GPIO5_MASK |
 323                                 OMAP3430_EN_GPIO6_MASK |
 324                                 OMAP3430_EN_UART3_MASK |
 325                                 OMAP3430_EN_MCBSP2_MASK |
 326                                 OMAP3430_EN_MCBSP3_MASK |
 327                                 OMAP3430_EN_MCBSP4_MASK,
 328                                 OMAP3430_PER_MOD, PM_WKEN);
 329
 330         /* and allow them to wake up MPU */
 331         omap2_prm_write_mod_reg(grpsel_uart4_mask |
 332                                 OMAP3430_GRPSEL_GPIO2_MASK |
 333                                 OMAP3430_GRPSEL_GPIO3_MASK |
 334                                 OMAP3430_GRPSEL_GPIO4_MASK |
 335                                 OMAP3430_GRPSEL_GPIO5_MASK |
 336                                 OMAP3430_GRPSEL_GPIO6_MASK |
 337                                 OMAP3430_GRPSEL_UART3_MASK |
 338                                 OMAP3430_GRPSEL_MCBSP2_MASK |
 339                                 OMAP3430_GRPSEL_MCBSP3_MASK |
 340                                 OMAP3430_GRPSEL_MCBSP4_MASK,
 341                                 OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL);
 342
 343         /* Don't attach IVA interrupts */
 344         if (has_iva) {
 345                 omap2_prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
 346                 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
 347                 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3);
 348                 omap2_prm_write_mod_reg(0, OMAP3430_PER_MOD,
 349                                         OMAP3430_PM_IVAGRPSEL);
 350         }
 351
 352         /* Clear any pending 'reset' flags */
 353         omap2_prm_write_mod_reg(0xffffffff, MPU_MOD, OMAP2_RM_RSTST);
 354         omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP2_RM_RSTST);
 355         omap2_prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST);
 356         omap2_prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST);
 357         omap2_prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST);
 358         omap2_prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST);
 359         omap2_prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD,
 360                                 OMAP2_RM_RSTST);
 361
 362         /* Clear any pending PRCM interrupts */
 363         omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 364
 365         /* We need to idle iva2_pwrdm even on am3703 with no iva2. */
 366         omap3xxx_prm_iva_idle();
 367
 368         omap3_prm_reset_modem();
 369 }
 370
 371 /**
 372  * omap3430_pre_es3_1_reconfigure_io_chain - restart wake-up daisy chain
 373  *
 374  * The ST_IO_CHAIN bit does not exist in 3430 before es3.1. The only
 375  * thing we can do is toggle EN_IO bit for earlier omaps.
 376  */
 377 void omap3430_pre_es3_1_reconfigure_io_chain(void)
 378 {
 379         omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
 380                                      PM_WKEN);
 381         omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
 382                                    PM_WKEN);
 383         omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN);
 384 }
 385
 386 /**
 387  * omap3_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
 388  *
 389  * Clear any previously-latched I/O wakeup events and ensure that the
 390  * I/O wakeup gates are aligned with the current mux settings.  Works
 391  * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then
 392  * deasserting WUCLKIN and clearing the ST_IO_CHAIN WKST bit.  No
 393  * return value. These registers are only available in 3430 es3.1 and later.
 394  */
 395 void omap3_prm_reconfigure_io_chain(void)
 396 {
 397         int i = 0;
 398
 399         omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
 400                                    PM_WKEN);
 401
 402         omap_test_timeout(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST) &
 403                           OMAP3430_ST_IO_CHAIN_MASK,
 404                           MAX_IOPAD_LATCH_TIME, i);
 405         if (i == MAX_IOPAD_LATCH_TIME)
 406                 pr_warn("PRM: I/O chain clock line assertion timed out\n");
 407
 408         omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
 409                                      PM_WKEN);
 410
 411         omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK, WKUP_MOD,
 412                                    PM_WKST);
 413
 414         omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST);
 415 }
 416
 417 /**
 418  * omap3xxx_prm_reconfigure_io_chain - reconfigure I/O chain
 419  */
 420 void omap3xxx_prm_reconfigure_io_chain(void)
 421 {
 422         if (omap3_prcm_irq_setup.reconfigure_io_chain)
 423                 omap3_prcm_irq_setup.reconfigure_io_chain();
 424 }
 425
 426 /**
 427  * omap3xxx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
 428  *
 429  * Activates the I/O wakeup event latches and allows events logged by
 430  * those latches to signal a wakeup event to the PRCM.  For I/O
 431  * wakeups to occur, WAKEUPENABLE bits must be set in the pad mux
 432  * registers, and omap3xxx_prm_reconfigure_io_chain() must be called.
 433  * No return value.
 434  */
 435 static void __init omap3xxx_prm_enable_io_wakeup(void)
 436 {
 437         if (prm_features & PRM_HAS_IO_WAKEUP)
 438                 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
 439                                            PM_WKEN);
 440 }
 441
 442 /**
 443  * omap3xxx_prm_read_reset_sources - return the last SoC reset source
 444  *
 445  * Return a u32 representing the last reset sources of the SoC.  The
 446  * returned reset source bits are standardized across OMAP SoCs.
 447  */
 448 static u32 omap3xxx_prm_read_reset_sources(void)
 449 {
 450         struct prm_reset_src_map *p;
 451         u32 r = 0;
 452         u32 v;
 453
 454         v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
 455
 456         p = omap3xxx_prm_reset_src_map;
 457         while (p->reg_shift >= 0 && p->std_shift >= 0) {
 458                 if (v & (1 << p->reg_shift))
 459                         r |= 1 << p->std_shift;
 460                 p++;
 461         }
 462
 463         return r;
 464 }
 465
 466 /**
 467  * omap3xxx_prm_iva_idle - ensure IVA is in idle so it can be put into retention
 468  *
 469  * In cases where IVA2 is activated by bootcode, it may prevent
 470  * full-chip retention or off-mode because it is not idle.  This
 471  * function forces the IVA2 into idle state so it can go
 472  * into retention/off and thus allow full-chip retention/off.
 473  */
 474 void omap3xxx_prm_iva_idle(void)
 475 {
 476         /* ensure IVA2 clock is disabled */
 477         omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
 478
 479         /* if no clock activity, nothing else to do */
 480         if (!(omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) &
 481               OMAP3430_CLKACTIVITY_IVA2_MASK))
 482                 return;
 483
 484         /* Reset IVA2 */
 485         omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
 486                                 OMAP3430_RST2_IVA2_MASK |
 487                                 OMAP3430_RST3_IVA2_MASK,
 488                                 OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
 489
 490         /* Enable IVA2 clock */
 491         omap2_cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK,
 492                                OMAP3430_IVA2_MOD, CM_FCLKEN);
 493
 494         /* Un-reset IVA2 */
 495         omap2_prm_write_mod_reg(0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
 496
 497         /* Disable IVA2 clock */
 498         omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
 499
 500         /* Reset IVA2 */
 501         omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
 502                                 OMAP3430_RST2_IVA2_MASK |
 503                                 OMAP3430_RST3_IVA2_MASK,
 504                                 OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
 505 }
 506
 507 /**
 508  * omap3xxx_prm_clear_global_cold_reset - checks the global cold reset status
 509  *                                        and clears it if asserted
 510  *
 511  * Checks if cold-reset has occurred and clears the status bit if yes. Returns
 512  * 1 if cold-reset has occurred, 0 otherwise.
 513  */
 514 int omap3xxx_prm_clear_global_cold_reset(void)
 515 {
 516         if (omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP3_PRM_RSTST_OFFSET) &
 517             OMAP3430_GLOBAL_COLD_RST_MASK) {
 518                 omap2_prm_set_mod_reg_bits(OMAP3430_GLOBAL_COLD_RST_MASK,
 519                                            OMAP3430_GR_MOD,
 520                                            OMAP3_PRM_RSTST_OFFSET);
 521                 return 1;
 522         }
 523
 524         return 0;
 525 }
 526
 527 void omap3_prm_save_scratchpad_contents(u32 *ptr)
 528 {
 529         *ptr++ = omap2_prm_read_mod_reg(OMAP3430_GR_MOD,
 530                                         OMAP3_PRM_CLKSRC_CTRL_OFFSET);
 531
 532         *ptr++ = omap2_prm_read_mod_reg(OMAP3430_GR_MOD,
 533                                         OMAP3_PRM_CLKSEL_OFFSET);
 534 }
 535
 536 /* Powerdomain low-level functions */
 537
 538 static int omap3_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
 539 {
 540         omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
 541                                    (pwrst << OMAP_POWERSTATE_SHIFT),
 542                                    pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
 543         return 0;
 544 }
 545
 546 static int omap3_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
 547 {
 548         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 549                                              OMAP2_PM_PWSTCTRL,
 550                                              OMAP_POWERSTATE_MASK);
 551 }
 552
 553 static int omap3_pwrdm_read_pwrst(struct powerdomain *pwrdm)
 554 {
 555         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 556                                              OMAP2_PM_PWSTST,
 557                                              OMAP_POWERSTATEST_MASK);
 558 }
 559
 560 /* Applicable only for OMAP3. Not supported on OMAP2 */
 561 static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
 562 {
 563         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 564                                              OMAP3430_PM_PREPWSTST,
 565                                              OMAP3430_LASTPOWERSTATEENTERED_MASK);
 566 }
 567
 568 static int omap3_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
 569 {
 570         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 571                                              OMAP2_PM_PWSTST,
 572                                              OMAP3430_LOGICSTATEST_MASK);
 573 }
 574
 575 static int omap3_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
 576 {
 577         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 578                                              OMAP2_PM_PWSTCTRL,
 579                                              OMAP3430_LOGICSTATEST_MASK);
 580 }
 581
 582 static int omap3_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
 583 {
 584         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 585                                              OMAP3430_PM_PREPWSTST,
 586                                              OMAP3430_LASTLOGICSTATEENTERED_MASK);
 587 }
 588
 589 static int omap3_get_mem_bank_lastmemst_mask(u8 bank)
 590 {
 591         switch (bank) {
 592         case 0:
 593                 return OMAP3430_LASTMEM1STATEENTERED_MASK;
 594         case 1:
 595                 return OMAP3430_LASTMEM2STATEENTERED_MASK;
 596         case 2:
 597                 return OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK;
 598         case 3:
 599                 return OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK;
 600         default:
 601                 WARN_ON(1); /* should never happen */
 602                 return -EEXIST;
 603         }
 604         return 0;
 605 }
 606
 607 static int omap3_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 608 {
 609         u32 m;
 610
 611         m = omap3_get_mem_bank_lastmemst_mask(bank);
 612
 613         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 614                                 OMAP3430_PM_PREPWSTST, m);
 615 }
 616
 617 static int omap3_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
 618 {
 619         omap2_prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST);
 620         return 0;
 621 }
 622
 623 static int omap3_pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
 624 {
 625         return omap2_prm_rmw_mod_reg_bits(0,
 626                                           1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
 627                                           pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
 628 }
 629
 630 static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
 631 {
 632         return omap2_prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
 633                                           0, pwrdm->prcm_offs,
 634                                           OMAP2_PM_PWSTCTRL);
 635 }
 636
 637 struct pwrdm_ops omap3_pwrdm_operations = {
 638         .pwrdm_set_next_pwrst   = omap3_pwrdm_set_next_pwrst,
 639         .pwrdm_read_next_pwrst  = omap3_pwrdm_read_next_pwrst,
 640         .pwrdm_read_pwrst       = omap3_pwrdm_read_pwrst,
 641         .pwrdm_read_prev_pwrst  = omap3_pwrdm_read_prev_pwrst,
 642         .pwrdm_set_logic_retst  = omap2_pwrdm_set_logic_retst,
 643         .pwrdm_read_logic_pwrst = omap3_pwrdm_read_logic_pwrst,
 644         .pwrdm_read_logic_retst = omap3_pwrdm_read_logic_retst,
 645         .pwrdm_read_prev_logic_pwrst    = omap3_pwrdm_read_prev_logic_pwrst,
 646         .pwrdm_set_mem_onst     = omap2_pwrdm_set_mem_onst,
 647         .pwrdm_set_mem_retst    = omap2_pwrdm_set_mem_retst,
 648         .pwrdm_read_mem_pwrst   = omap2_pwrdm_read_mem_pwrst,
 649         .pwrdm_read_mem_retst   = omap2_pwrdm_read_mem_retst,
 650         .pwrdm_read_prev_mem_pwrst      = omap3_pwrdm_read_prev_mem_pwrst,
 651         .pwrdm_clear_all_prev_pwrst     = omap3_pwrdm_clear_all_prev_pwrst,
 652         .pwrdm_enable_hdwr_sar  = omap3_pwrdm_enable_hdwr_sar,
 653         .pwrdm_disable_hdwr_sar = omap3_pwrdm_disable_hdwr_sar,
 654         .pwrdm_wait_transition  = omap2_pwrdm_wait_transition,
 655 };
 656
 657 /*
 658  *
 659  */
 660
 661 static int omap3xxx_prm_late_init(void);
 662
 663 static struct prm_ll_data omap3xxx_prm_ll_data = {
 664         .read_reset_sources = &omap3xxx_prm_read_reset_sources,
 665         .late_init = &omap3xxx_prm_late_init,
 666 };
 667
 668 int __init omap3xxx_prm_init(void)
 669 {
 670         if (omap3_has_io_wakeup())
 671                 prm_features |= PRM_HAS_IO_WAKEUP;
 672
 673         return prm_register(&omap3xxx_prm_ll_data);
 674 }
 675
 676 static int omap3xxx_prm_late_init(void)
 677 {
 678         int ret;
 679
 680         if (!(prm_features & PRM_HAS_IO_WAKEUP))
 681                 return 0;
 682
 683         if (omap3_has_io_chain_ctrl())
 684                 omap3_prcm_irq_setup.reconfigure_io_chain =
 685                         omap3_prm_reconfigure_io_chain;
 686         else
 687                 omap3_prcm_irq_setup.reconfigure_io_chain =
 688                         omap3430_pre_es3_1_reconfigure_io_chain;
 689
 690         omap3xxx_prm_enable_io_wakeup();
 691         ret = omap_prcm_register_chain_handler(&omap3_prcm_irq_setup);
 692         if (!ret)
 693                 irq_set_status_flags(omap_prcm_event_to_irq("io"),
 694                                      IRQ_NOAUTOEN);
 695
 696         return ret;
 697 }
 698
 699 static void __exit omap3xxx_prm_exit(void)
 700 {
 701         prm_unregister(&omap3xxx_prm_ll_data);
 702 }
 703 __exitcall(omap3xxx_prm_exit);