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 "common.h"
  22 #include <plat/cpu.h>
  23
  24 #include "vp.h"
  25 #include "powerdomain.h"
  26 #include "prm3xxx.h"
  27 #include "prm2xxx_3xxx.h"
  28 #include "cm2xxx_3xxx.h"
  29 #include "prm-regbits-34xx.h"
  30
  31 static const struct omap_prcm_irq omap3_prcm_irqs[] = {
  32         OMAP_PRCM_IRQ("wkup",   0,      0),
  33         OMAP_PRCM_IRQ("io",     9,      1),
  34 };
  35
  36 static struct omap_prcm_irq_setup omap3_prcm_irq_setup = {
  37         .ack                    = OMAP3_PRM_IRQSTATUS_MPU_OFFSET,
  38         .mask                   = OMAP3_PRM_IRQENABLE_MPU_OFFSET,
  39         .nr_regs                = 1,
  40         .irqs                   = omap3_prcm_irqs,
  41         .nr_irqs                = ARRAY_SIZE(omap3_prcm_irqs),
  42         .irq                    = 11 + OMAP_INTC_START,
  43         .read_pending_irqs      = &omap3xxx_prm_read_pending_irqs,
  44         .ocp_barrier            = &omap3xxx_prm_ocp_barrier,
  45         .save_and_clear_irqen   = &omap3xxx_prm_save_and_clear_irqen,
  46         .restore_irqen          = &omap3xxx_prm_restore_irqen,
  47 };
  48
  49 /*
  50  * omap3_prm_reset_src_map - map from bits in the PRM_RSTST hardware
  51  *   register (which are specific to OMAP3xxx SoCs) to reset source ID
  52  *   bit shifts (which is an OMAP SoC-independent enumeration)
  53  */
  54 static struct prm_reset_src_map omap3xxx_prm_reset_src_map[] = {
  55         { OMAP3430_GLOBAL_COLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
  56         { OMAP3430_GLOBAL_SW_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
  57         { OMAP3430_SECURITY_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
  58         { OMAP3430_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
  59         { OMAP3430_SECURE_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
  60         { OMAP3430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
  61         { OMAP3430_VDD1_VOLTAGE_MANAGER_RST_SHIFT,
  62           OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT },
  63         { OMAP3430_VDD2_VOLTAGE_MANAGER_RST_SHIFT,
  64           OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT },
  65         { OMAP3430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT },
  66         { OMAP3430_ICECRUSHER_RST_SHIFT, OMAP_ICECRUSHER_RST_SRC_ID_SHIFT },
  67         { -1, -1 },
  68 };
  69
  70 /* PRM VP */
  71
  72 /*
  73  * struct omap3_vp - OMAP3 VP register access description.
  74  * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
  75  */
  76 struct omap3_vp {
  77         u32 tranxdone_status;
  78 };
  79
  80 static struct omap3_vp omap3_vp[] = {
  81         [OMAP3_VP_VDD_MPU_ID] = {
  82                 .tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK,
  83         },
  84         [OMAP3_VP_VDD_CORE_ID] = {
  85                 .tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK,
  86         },
  87 };
  88
  89 #define MAX_VP_ID ARRAY_SIZE(omap3_vp);
  90
  91 u32 omap3_prm_vp_check_txdone(u8 vp_id)
  92 {
  93         struct omap3_vp *vp = &omap3_vp[vp_id];
  94         u32 irqstatus;
  95
  96         irqstatus = omap2_prm_read_mod_reg(OCP_MOD,
  97                                            OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
  98         return irqstatus & vp->tranxdone_status;
  99 }
 100
 101 void omap3_prm_vp_clear_txdone(u8 vp_id)
 102 {
 103         struct omap3_vp *vp = &omap3_vp[vp_id];
 104
 105         omap2_prm_write_mod_reg(vp->tranxdone_status,
 106                                 OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 107 }
 108
 109 u32 omap3_prm_vcvp_read(u8 offset)
 110 {
 111         return omap2_prm_read_mod_reg(OMAP3430_GR_MOD, offset);
 112 }
 113
 114 void omap3_prm_vcvp_write(u32 val, u8 offset)
 115 {
 116         omap2_prm_write_mod_reg(val, OMAP3430_GR_MOD, offset);
 117 }
 118
 119 u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
 120 {
 121         return omap2_prm_rmw_mod_reg_bits(mask, bits, OMAP3430_GR_MOD, offset);
 122 }
 123
 124 /**
 125  * omap3xxx_prm_dpll3_reset - use DPLL3 reset to reboot the OMAP SoC
 126  *
 127  * Set the DPLL3 reset bit, which should reboot the SoC.  This is the
 128  * recommended way to restart the SoC, considering Errata i520.  No
 129  * return value.
 130  */
 131 void omap3xxx_prm_dpll3_reset(void)
 132 {
 133         omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, OMAP3430_GR_MOD,
 134                                    OMAP2_RM_RSTCTRL);
 135         /* OCP barrier */
 136         omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP2_RM_RSTCTRL);
 137 }
 138
 139 /**
 140  * omap3xxx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
 141  * @events: ptr to a u32, preallocated by caller
 142  *
 143  * Read PRM_IRQSTATUS_MPU bits, AND'ed with the currently-enabled PRM
 144  * MPU IRQs, and store the result into the u32 pointed to by @events.
 145  * No return value.
 146  */
 147 void omap3xxx_prm_read_pending_irqs(unsigned long *events)
 148 {
 149         u32 mask, st;
 150
 151         /* XXX Can the mask read be avoided (e.g., can it come from RAM?) */
 152         mask = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 153         st = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 154
 155         events[0] = mask & st;
 156 }
 157
 158 /**
 159  * omap3xxx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
 160  *
 161  * Force any buffered writes to the PRM IP block to complete.  Needed
 162  * by the PRM IRQ handler, which reads and writes directly to the IP
 163  * block, to avoid race conditions after acknowledging or clearing IRQ
 164  * bits.  No return value.
 165  */
 166 void omap3xxx_prm_ocp_barrier(void)
 167 {
 168         omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
 169 }
 170
 171 /**
 172  * omap3xxx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU reg
 173  * @saved_mask: ptr to a u32 array to save IRQENABLE bits
 174  *
 175  * Save the PRM_IRQENABLE_MPU register to @saved_mask.  @saved_mask
 176  * must be allocated by the caller.  Intended to be used in the PRM
 177  * interrupt handler suspend callback.  The OCP barrier is needed to
 178  * ensure the write to disable PRM interrupts reaches the PRM before
 179  * returning; otherwise, spurious interrupts might occur.  No return
 180  * value.
 181  */
 182 void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask)
 183 {
 184         saved_mask[0] = omap2_prm_read_mod_reg(OCP_MOD,
 185                                                OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 186         omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 187
 188         /* OCP barrier */
 189         omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
 190 }
 191
 192 /**
 193  * omap3xxx_prm_restore_irqen - set PRM_IRQENABLE_MPU register from args
 194  * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
 195  *
 196  * Restore the PRM_IRQENABLE_MPU register from @saved_mask.  Intended
 197  * to be used in the PRM interrupt handler resume callback to restore
 198  * values saved by omap3xxx_prm_save_and_clear_irqen().  No OCP
 199  * barrier should be needed here; any pending PRM interrupts will fire
 200  * once the writes reach the PRM.  No return value.
 201  */
 202 void omap3xxx_prm_restore_irqen(u32 *saved_mask)
 203 {
 204         omap2_prm_write_mod_reg(saved_mask[0], OCP_MOD,
 205                                 OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 206 }
 207
 208 /**
 209  * omap3xxx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
 210  *
 211  * Clear any previously-latched I/O wakeup events and ensure that the
 212  * I/O wakeup gates are aligned with the current mux settings.  Works
 213  * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then
 214  * deasserting WUCLKIN and clearing the ST_IO_CHAIN WKST bit.  No
 215  * return value.
 216  */
 217 void omap3xxx_prm_reconfigure_io_chain(void)
 218 {
 219         int i = 0;
 220
 221         omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
 222                                    PM_WKEN);
 223
 224         omap_test_timeout(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST) &
 225                           OMAP3430_ST_IO_CHAIN_MASK,
 226                           MAX_IOPAD_LATCH_TIME, i);
 227         if (i == MAX_IOPAD_LATCH_TIME)
 228                 pr_warn("PRM: I/O chain clock line assertion timed out\n");
 229
 230         omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
 231                                      PM_WKEN);
 232
 233         omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK, WKUP_MOD,
 234                                    PM_WKST);
 235
 236         omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST);
 237 }
 238
 239 /**
 240  * omap3xxx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
 241  *
 242  * Activates the I/O wakeup event latches and allows events logged by
 243  * those latches to signal a wakeup event to the PRCM.  For I/O
 244  * wakeups to occur, WAKEUPENABLE bits must be set in the pad mux
 245  * registers, and omap3xxx_prm_reconfigure_io_chain() must be called.
 246  * No return value.
 247  */
 248 static void __init omap3xxx_prm_enable_io_wakeup(void)
 249 {
 250         if (omap3_has_io_wakeup())
 251                 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
 252                                            PM_WKEN);
 253 }
 254
 255 /**
 256  * omap3xxx_prm_read_reset_sources - return the last SoC reset source
 257  *
 258  * Return a u32 representing the last reset sources of the SoC.  The
 259  * returned reset source bits are standardized across OMAP SoCs.
 260  */
 261 static u32 omap3xxx_prm_read_reset_sources(void)
 262 {
 263         struct prm_reset_src_map *p;
 264         u32 r = 0;
 265         u32 v;
 266
 267         v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
 268
 269         p = omap3xxx_prm_reset_src_map;
 270         while (p->reg_shift >= 0 && p->std_shift >= 0) {
 271                 if (v & (1 << p->reg_shift))
 272                         r |= 1 << p->std_shift;
 273                 p++;
 274         }
 275
 276         return r;
 277 }
 278
 279 /* Powerdomain low-level functions */
 280
 281 /* Applicable only for OMAP3. Not supported on OMAP2 */
 282 static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
 283 {
 284         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 285                                              OMAP3430_PM_PREPWSTST,
 286                                              OMAP3430_LASTPOWERSTATEENTERED_MASK);
 287 }
 288
 289 static int omap3_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
 290 {
 291         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 292                                              OMAP2_PM_PWSTST,
 293                                              OMAP3430_LOGICSTATEST_MASK);
 294 }
 295
 296 static int omap3_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
 297 {
 298         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 299                                              OMAP2_PM_PWSTCTRL,
 300                                              OMAP3430_LOGICSTATEST_MASK);
 301 }
 302
 303 static int omap3_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
 304 {
 305         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 306                                              OMAP3430_PM_PREPWSTST,
 307                                              OMAP3430_LASTLOGICSTATEENTERED_MASK);
 308 }
 309
 310 static int omap3_get_mem_bank_lastmemst_mask(u8 bank)
 311 {
 312         switch (bank) {
 313         case 0:
 314                 return OMAP3430_LASTMEM1STATEENTERED_MASK;
 315         case 1:
 316                 return OMAP3430_LASTMEM2STATEENTERED_MASK;
 317         case 2:
 318                 return OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK;
 319         case 3:
 320                 return OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK;
 321         default:
 322                 WARN_ON(1); /* should never happen */
 323                 return -EEXIST;
 324         }
 325         return 0;
 326 }
 327
 328 static int omap3_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 329 {
 330         u32 m;
 331
 332         m = omap3_get_mem_bank_lastmemst_mask(bank);
 333
 334         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 335                                 OMAP3430_PM_PREPWSTST, m);
 336 }
 337
 338 static int omap3_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
 339 {
 340         omap2_prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST);
 341         return 0;
 342 }
 343
 344 static int omap3_pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
 345 {
 346         return omap2_prm_rmw_mod_reg_bits(0,
 347                                           1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
 348                                           pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
 349 }
 350
 351 static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
 352 {
 353         return omap2_prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
 354                                           0, pwrdm->prcm_offs,
 355                                           OMAP2_PM_PWSTCTRL);
 356 }
 357
 358 struct pwrdm_ops omap3_pwrdm_operations = {
 359         .pwrdm_set_next_pwrst   = omap2_pwrdm_set_next_pwrst,
 360         .pwrdm_read_next_pwrst  = omap2_pwrdm_read_next_pwrst,
 361         .pwrdm_read_pwrst       = omap2_pwrdm_read_pwrst,
 362         .pwrdm_read_prev_pwrst  = omap3_pwrdm_read_prev_pwrst,
 363         .pwrdm_set_logic_retst  = omap2_pwrdm_set_logic_retst,
 364         .pwrdm_read_logic_pwrst = omap3_pwrdm_read_logic_pwrst,
 365         .pwrdm_read_logic_retst = omap3_pwrdm_read_logic_retst,
 366         .pwrdm_read_prev_logic_pwrst    = omap3_pwrdm_read_prev_logic_pwrst,
 367         .pwrdm_set_mem_onst     = omap2_pwrdm_set_mem_onst,
 368         .pwrdm_set_mem_retst    = omap2_pwrdm_set_mem_retst,
 369         .pwrdm_read_mem_pwrst   = omap2_pwrdm_read_mem_pwrst,
 370         .pwrdm_read_mem_retst   = omap2_pwrdm_read_mem_retst,
 371         .pwrdm_read_prev_mem_pwrst      = omap3_pwrdm_read_prev_mem_pwrst,
 372         .pwrdm_clear_all_prev_pwrst     = omap3_pwrdm_clear_all_prev_pwrst,
 373         .pwrdm_enable_hdwr_sar  = omap3_pwrdm_enable_hdwr_sar,
 374         .pwrdm_disable_hdwr_sar = omap3_pwrdm_disable_hdwr_sar,
 375         .pwrdm_wait_transition  = omap2_pwrdm_wait_transition,
 376 };
 377
 378 /*
 379  *
 380  */
 381
 382 static struct prm_ll_data omap3xxx_prm_ll_data = {
 383         .read_reset_sources = &omap3xxx_prm_read_reset_sources,
 384 };
 385
 386 int __init omap3xxx_prm_init(void)
 387 {
 388         if (!cpu_is_omap34xx())
 389                 return 0;
 390
 391         return prm_register(&omap3xxx_prm_ll_data);
 392 }
 393
 394 static int __init omap3xxx_prm_late_init(void)
 395 {
 396         int ret;
 397
 398         if (!cpu_is_omap34xx())
 399                 return 0;
 400
 401         omap3xxx_prm_enable_io_wakeup();
 402         ret = omap_prcm_register_chain_handler(&omap3_prcm_irq_setup);
 403         if (!ret)
 404                 irq_set_status_flags(omap_prcm_event_to_irq("io"),
 405                                      IRQ_NOAUTOEN);
 406
 407         return ret;
 408 }
 409 subsys_initcall(omap3xxx_prm_late_init);
 410
 411 static void __exit omap3xxx_prm_exit(void)
 412 {
 413         if (!cpu_is_omap34xx())
 414                 return;
 415
 416         /* Should never happen */
 417         WARN(prm_unregister(&omap3xxx_prm_ll_data),
 418              "%s: prm_ll_data function pointer mismatch\n", __func__);
 419 }
 420 __exitcall(omap3xxx_prm_exit);