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
  30 static const struct omap_prcm_irq omap3_prcm_irqs[] = {
  31         OMAP_PRCM_IRQ("wkup",   0,      0),
  32         OMAP_PRCM_IRQ("io",     9,      1),
  33 };
  34
  35 static struct omap_prcm_irq_setup omap3_prcm_irq_setup = {
  36         .ack                    = OMAP3_PRM_IRQSTATUS_MPU_OFFSET,
  37         .mask                   = OMAP3_PRM_IRQENABLE_MPU_OFFSET,
  38         .nr_regs                = 1,
  39         .irqs                   = omap3_prcm_irqs,
  40         .nr_irqs                = ARRAY_SIZE(omap3_prcm_irqs),
  41         .irq                    = 11 + OMAP_INTC_START,
  42         .read_pending_irqs      = &omap3xxx_prm_read_pending_irqs,
  43         .ocp_barrier            = &omap3xxx_prm_ocp_barrier,
  44         .save_and_clear_irqen   = &omap3xxx_prm_save_and_clear_irqen,
  45         .restore_irqen          = &omap3xxx_prm_restore_irqen,
  46 };
  47
  48 /*
  49  * omap3_prm_reset_src_map - map from bits in the PRM_RSTST hardware
  50  *   register (which are specific to OMAP3xxx SoCs) to reset source ID
  51  *   bit shifts (which is an OMAP SoC-independent enumeration)
  52  */
  53 static struct prm_reset_src_map omap3xxx_prm_reset_src_map[] = {
  54         { OMAP3430_GLOBAL_COLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
  55         { OMAP3430_GLOBAL_SW_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
  56         { OMAP3430_SECURITY_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
  57         { OMAP3430_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
  58         { OMAP3430_SECURE_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
  59         { OMAP3430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
  60         { OMAP3430_VDD1_VOLTAGE_MANAGER_RST_SHIFT,
  61           OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT },
  62         { OMAP3430_VDD2_VOLTAGE_MANAGER_RST_SHIFT,
  63           OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT },
  64         { OMAP3430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT },
  65         { OMAP3430_ICECRUSHER_RST_SHIFT, OMAP_ICECRUSHER_RST_SRC_ID_SHIFT },
  66         { -1, -1 },
  67 };
  68
  69 /* PRM VP */
  70
  71 /*
  72  * struct omap3_vp - OMAP3 VP register access description.
  73  * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
  74  */
  75 struct omap3_vp {
  76         u32 tranxdone_status;
  77 };
  78
  79 static struct omap3_vp omap3_vp[] = {
  80         [OMAP3_VP_VDD_MPU_ID] = {
  81                 .tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK,
  82         },
  83         [OMAP3_VP_VDD_CORE_ID] = {
  84                 .tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK,
  85         },
  86 };
  87
  88 #define MAX_VP_ID ARRAY_SIZE(omap3_vp);
  89
  90 u32 omap3_prm_vp_check_txdone(u8 vp_id)
  91 {
  92         struct omap3_vp *vp = &omap3_vp[vp_id];
  93         u32 irqstatus;
  94
  95         irqstatus = omap2_prm_read_mod_reg(OCP_MOD,
  96                                            OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
  97         return irqstatus & vp->tranxdone_status;
  98 }
  99
 100 void omap3_prm_vp_clear_txdone(u8 vp_id)
 101 {
 102         struct omap3_vp *vp = &omap3_vp[vp_id];
 103
 104         omap2_prm_write_mod_reg(vp->tranxdone_status,
 105                                 OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 106 }
 107
 108 u32 omap3_prm_vcvp_read(u8 offset)
 109 {
 110         return omap2_prm_read_mod_reg(OMAP3430_GR_MOD, offset);
 111 }
 112
 113 void omap3_prm_vcvp_write(u32 val, u8 offset)
 114 {
 115         omap2_prm_write_mod_reg(val, OMAP3430_GR_MOD, offset);
 116 }
 117
 118 u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
 119 {
 120         return omap2_prm_rmw_mod_reg_bits(mask, bits, OMAP3430_GR_MOD, offset);
 121 }
 122
 123 /**
 124  * omap3xxx_prm_dpll3_reset - use DPLL3 reset to reboot the OMAP SoC
 125  *
 126  * Set the DPLL3 reset bit, which should reboot the SoC.  This is the
 127  * recommended way to restart the SoC, considering Errata i520.  No
 128  * return value.
 129  */
 130 void omap3xxx_prm_dpll3_reset(void)
 131 {
 132         omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, OMAP3430_GR_MOD,
 133                                    OMAP2_RM_RSTCTRL);
 134         /* OCP barrier */
 135         omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP2_RM_RSTCTRL);
 136 }
 137
 138 /**
 139  * omap3xxx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
 140  * @events: ptr to a u32, preallocated by caller
 141  *
 142  * Read PRM_IRQSTATUS_MPU bits, AND'ed with the currently-enabled PRM
 143  * MPU IRQs, and store the result into the u32 pointed to by @events.
 144  * No return value.
 145  */
 146 void omap3xxx_prm_read_pending_irqs(unsigned long *events)
 147 {
 148         u32 mask, st;
 149
 150         /* XXX Can the mask read be avoided (e.g., can it come from RAM?) */
 151         mask = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 152         st = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 153
 154         events[0] = mask & st;
 155 }
 156
 157 /**
 158  * omap3xxx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
 159  *
 160  * Force any buffered writes to the PRM IP block to complete.  Needed
 161  * by the PRM IRQ handler, which reads and writes directly to the IP
 162  * block, to avoid race conditions after acknowledging or clearing IRQ
 163  * bits.  No return value.
 164  */
 165 void omap3xxx_prm_ocp_barrier(void)
 166 {
 167         omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
 168 }
 169
 170 /**
 171  * omap3xxx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU reg
 172  * @saved_mask: ptr to a u32 array to save IRQENABLE bits
 173  *
 174  * Save the PRM_IRQENABLE_MPU register to @saved_mask.  @saved_mask
 175  * must be allocated by the caller.  Intended to be used in the PRM
 176  * interrupt handler suspend callback.  The OCP barrier is needed to
 177  * ensure the write to disable PRM interrupts reaches the PRM before
 178  * returning; otherwise, spurious interrupts might occur.  No return
 179  * value.
 180  */
 181 void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask)
 182 {
 183         saved_mask[0] = omap2_prm_read_mod_reg(OCP_MOD,
 184                                                OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 185         omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 186
 187         /* OCP barrier */
 188         omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
 189 }
 190
 191 /**
 192  * omap3xxx_prm_restore_irqen - set PRM_IRQENABLE_MPU register from args
 193  * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
 194  *
 195  * Restore the PRM_IRQENABLE_MPU register from @saved_mask.  Intended
 196  * to be used in the PRM interrupt handler resume callback to restore
 197  * values saved by omap3xxx_prm_save_and_clear_irqen().  No OCP
 198  * barrier should be needed here; any pending PRM interrupts will fire
 199  * once the writes reach the PRM.  No return value.
 200  */
 201 void omap3xxx_prm_restore_irqen(u32 *saved_mask)
 202 {
 203         omap2_prm_write_mod_reg(saved_mask[0], OCP_MOD,
 204                                 OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 205 }
 206
 207 /**
 208  * omap3xxx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
 209  *
 210  * Clear any previously-latched I/O wakeup events and ensure that the
 211  * I/O wakeup gates are aligned with the current mux settings.  Works
 212  * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then
 213  * deasserting WUCLKIN and clearing the ST_IO_CHAIN WKST bit.  No
 214  * return value.
 215  */
 216 void omap3xxx_prm_reconfigure_io_chain(void)
 217 {
 218         int i = 0;
 219
 220         omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
 221                                    PM_WKEN);
 222
 223         omap_test_timeout(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST) &
 224                           OMAP3430_ST_IO_CHAIN_MASK,
 225                           MAX_IOPAD_LATCH_TIME, i);
 226         if (i == MAX_IOPAD_LATCH_TIME)
 227                 pr_warn("PRM: I/O chain clock line assertion timed out\n");
 228
 229         omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
 230                                      PM_WKEN);
 231
 232         omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK, WKUP_MOD,
 233                                    PM_WKST);
 234
 235         omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST);
 236 }
 237
 238 /**
 239  * omap3xxx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
 240  *
 241  * Activates the I/O wakeup event latches and allows events logged by
 242  * those latches to signal a wakeup event to the PRCM.  For I/O
 243  * wakeups to occur, WAKEUPENABLE bits must be set in the pad mux
 244  * registers, and omap3xxx_prm_reconfigure_io_chain() must be called.
 245  * No return value.
 246  */
 247 static void __init omap3xxx_prm_enable_io_wakeup(void)
 248 {
 249         if (omap3_has_io_wakeup())
 250                 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
 251                                            PM_WKEN);
 252 }
 253
 254 /**
 255  * omap3xxx_prm_read_reset_sources - return the last SoC reset source
 256  *
 257  * Return a u32 representing the last reset sources of the SoC.  The
 258  * returned reset source bits are standardized across OMAP SoCs.
 259  */
 260 static u32 omap3xxx_prm_read_reset_sources(void)
 261 {
 262         struct prm_reset_src_map *p;
 263         u32 r = 0;
 264         u32 v;
 265
 266         v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
 267
 268         p = omap3xxx_prm_reset_src_map;
 269         while (p->reg_shift >= 0 && p->std_shift >= 0) {
 270                 if (v & (1 << p->reg_shift))
 271                         r |= 1 << p->std_shift;
 272                 p++;
 273         }
 274
 275         return r;
 276 }
 277
 278 /* Powerdomain low-level functions */
 279
 280 /* Applicable only for OMAP3. Not supported on OMAP2 */
 281 static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
 282 {
 283         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 284                                              OMAP3430_PM_PREPWSTST,
 285                                              OMAP3430_LASTPOWERSTATEENTERED_MASK);
 286 }
 287
 288 static int omap3_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
 289 {
 290         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 291                                              OMAP2_PM_PWSTST,
 292                                              OMAP3430_LOGICSTATEST_MASK);
 293 }
 294
 295 static int omap3_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
 296 {
 297         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 298                                              OMAP2_PM_PWSTCTRL,
 299                                              OMAP3430_LOGICSTATEST_MASK);
 300 }
 301
 302 static int omap3_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
 303 {
 304         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 305                                              OMAP3430_PM_PREPWSTST,
 306                                              OMAP3430_LASTLOGICSTATEENTERED_MASK);
 307 }
 308
 309 static int omap3_get_mem_bank_lastmemst_mask(u8 bank)
 310 {
 311         switch (bank) {
 312         case 0:
 313                 return OMAP3430_LASTMEM1STATEENTERED_MASK;
 314         case 1:
 315                 return OMAP3430_LASTMEM2STATEENTERED_MASK;
 316         case 2:
 317                 return OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK;
 318         case 3:
 319                 return OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK;
 320         default:
 321                 WARN_ON(1); /* should never happen */
 322                 return -EEXIST;
 323         }
 324         return 0;
 325 }
 326
 327 static int omap3_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 328 {
 329         u32 m;
 330
 331         m = omap3_get_mem_bank_lastmemst_mask(bank);
 332
 333         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 334                                 OMAP3430_PM_PREPWSTST, m);
 335 }
 336
 337 static int omap3_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
 338 {
 339         omap2_prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST);
 340         return 0;
 341 }
 342
 343 static int omap3_pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
 344 {
 345         return omap2_prm_rmw_mod_reg_bits(0,
 346                                           1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
 347                                           pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
 348 }
 349
 350 static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
 351 {
 352         return omap2_prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
 353                                           0, pwrdm->prcm_offs,
 354                                           OMAP2_PM_PWSTCTRL);
 355 }
 356
 357 struct pwrdm_ops omap3_pwrdm_operations = {
 358         .pwrdm_set_next_pwrst   = omap2_pwrdm_set_next_pwrst,
 359         .pwrdm_read_next_pwrst  = omap2_pwrdm_read_next_pwrst,
 360         .pwrdm_read_pwrst       = omap2_pwrdm_read_pwrst,
 361         .pwrdm_read_prev_pwrst  = omap3_pwrdm_read_prev_pwrst,
 362         .pwrdm_set_logic_retst  = omap2_pwrdm_set_logic_retst,
 363         .pwrdm_read_logic_pwrst = omap3_pwrdm_read_logic_pwrst,
 364         .pwrdm_read_logic_retst = omap3_pwrdm_read_logic_retst,
 365         .pwrdm_read_prev_logic_pwrst    = omap3_pwrdm_read_prev_logic_pwrst,
 366         .pwrdm_set_mem_onst     = omap2_pwrdm_set_mem_onst,
 367         .pwrdm_set_mem_retst    = omap2_pwrdm_set_mem_retst,
 368         .pwrdm_read_mem_pwrst   = omap2_pwrdm_read_mem_pwrst,
 369         .pwrdm_read_mem_retst   = omap2_pwrdm_read_mem_retst,
 370         .pwrdm_read_prev_mem_pwrst      = omap3_pwrdm_read_prev_mem_pwrst,
 371         .pwrdm_clear_all_prev_pwrst     = omap3_pwrdm_clear_all_prev_pwrst,
 372         .pwrdm_enable_hdwr_sar  = omap3_pwrdm_enable_hdwr_sar,
 373         .pwrdm_disable_hdwr_sar = omap3_pwrdm_disable_hdwr_sar,
 374         .pwrdm_wait_transition  = omap2_pwrdm_wait_transition,
 375 };
 376
 377 /*
 378  *
 379  */
 380
 381 static struct prm_ll_data omap3xxx_prm_ll_data = {
 382         .read_reset_sources = &omap3xxx_prm_read_reset_sources,
 383 };
 384
 385 int __init omap3xxx_prm_init(void)
 386 {
 387         if (!cpu_is_omap34xx())
 388                 return 0;
 389
 390         return prm_register(&omap3xxx_prm_ll_data);
 391 }
 392
 393 static int __init omap3xxx_prm_late_init(void)
 394 {
 395         int ret;
 396
 397         if (!cpu_is_omap34xx())
 398                 return 0;
 399
 400         omap3xxx_prm_enable_io_wakeup();
 401         ret = omap_prcm_register_chain_handler(&omap3_prcm_irq_setup);
 402         if (!ret)
 403                 irq_set_status_flags(omap_prcm_event_to_irq("io"),
 404                                      IRQ_NOAUTOEN);
 405
 406         return ret;
 407 }
 408 subsys_initcall(omap3xxx_prm_late_init);
 409
 410 static void __exit omap3xxx_prm_exit(void)
 411 {
 412         if (!cpu_is_omap34xx())
 413                 return;
 414
 415         /* Should never happen */
 416         WARN(prm_unregister(&omap3xxx_prm_ll_data),
 417              "%s: prm_ll_data function pointer mismatch\n", __func__);
 418 }
 419 __exitcall(omap3xxx_prm_exit);