linux/arch/arm/mach-shmobile/pm-sh7372.c
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   1/*
   2 * sh7372 Power management support
   3 *
   4 *  Copyright (C) 2011 Magnus Damm
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10
  11#include <linux/pm.h>
  12#include <linux/suspend.h>
  13#include <linux/cpuidle.h>
  14#include <linux/module.h>
  15#include <linux/list.h>
  16#include <linux/err.h>
  17#include <linux/slab.h>
  18#include <linux/pm_clock.h>
  19#include <linux/platform_device.h>
  20#include <linux/delay.h>
  21#include <linux/irq.h>
  22#include <linux/bitrev.h>
  23#include <linux/console.h>
  24#include <asm/cpuidle.h>
  25#include <asm/io.h>
  26#include <asm/tlbflush.h>
  27#include <asm/suspend.h>
  28#include <mach/common.h>
  29#include <mach/sh7372.h>
  30#include <mach/pm-rmobile.h>
  31
  32/* DBG */
  33#define DBGREG1 IOMEM(0xe6100020)
  34#define DBGREG9 IOMEM(0xe6100040)
  35
  36/* CPGA */
  37#define SYSTBCR IOMEM(0xe6150024)
  38#define MSTPSR0 IOMEM(0xe6150030)
  39#define MSTPSR1 IOMEM(0xe6150038)
  40#define MSTPSR2 IOMEM(0xe6150040)
  41#define MSTPSR3 IOMEM(0xe6150048)
  42#define MSTPSR4 IOMEM(0xe615004c)
  43#define PLLC01STPCR IOMEM(0xe61500c8)
  44
  45/* SYSC */
  46#define SBAR IOMEM(0xe6180020)
  47#define WUPRMSK IOMEM(0xe6180028)
  48#define WUPSMSK IOMEM(0xe618002c)
  49#define WUPSMSK2 IOMEM(0xe6180048)
  50#define WUPSFAC IOMEM(0xe6180098)
  51#define IRQCR IOMEM(0xe618022c)
  52#define IRQCR2 IOMEM(0xe6180238)
  53#define IRQCR3 IOMEM(0xe6180244)
  54#define IRQCR4 IOMEM(0xe6180248)
  55#define PDNSEL IOMEM(0xe6180254)
  56
  57/* INTC */
  58#define ICR1A IOMEM(0xe6900000)
  59#define ICR2A IOMEM(0xe6900004)
  60#define ICR3A IOMEM(0xe6900008)
  61#define ICR4A IOMEM(0xe690000c)
  62#define INTMSK00A IOMEM(0xe6900040)
  63#define INTMSK10A IOMEM(0xe6900044)
  64#define INTMSK20A IOMEM(0xe6900048)
  65#define INTMSK30A IOMEM(0xe690004c)
  66
  67/* MFIS */
  68/* FIXME: pointing where? */
  69#define SMFRAM 0xe6a70000
  70
  71/* AP-System Core */
  72#define APARMBAREA IOMEM(0xe6f10020)
  73
  74#ifdef CONFIG_PM
  75
  76#define PM_DOMAIN_ON_OFF_LATENCY_NS     250000
  77
  78static int sh7372_a4r_pd_suspend(void)
  79{
  80        sh7372_intcs_suspend();
  81        __raw_writel(0x300fffff, WUPRMSK); /* avoid wakeup */
  82        return 0;
  83}
  84
  85static bool a4s_suspend_ready;
  86
  87static int sh7372_a4s_pd_suspend(void)
  88{
  89        /*
  90         * The A4S domain contains the CPU core and therefore it should
  91         * only be turned off if the CPU is not in use.  This may happen
  92         * during system suspend, when SYSC is going to be used for generating
  93         * resume signals and a4s_suspend_ready is set to let
  94         * sh7372_enter_suspend() know that it can turn A4S off.
  95         */
  96        a4s_suspend_ready = true;
  97        return -EBUSY;
  98}
  99
 100static void sh7372_a4s_pd_resume(void)
 101{
 102        a4s_suspend_ready = false;
 103}
 104
 105static int sh7372_a3sp_pd_suspend(void)
 106{
 107        /*
 108         * Serial consoles make use of SCIF hardware located in A3SP,
 109         * keep such power domain on if "no_console_suspend" is set.
 110         */
 111        return console_suspend_enabled ? 0 : -EBUSY;
 112}
 113
 114static struct rmobile_pm_domain sh7372_pm_domains[] = {
 115        {
 116                .genpd.name = "A4LC",
 117                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 118                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 119                .bit_shift = 1,
 120        },
 121        {
 122                .genpd.name = "A4MP",
 123                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 124                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 125                .bit_shift = 2,
 126        },
 127        {
 128                .genpd.name = "D4",
 129                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 130                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 131                .bit_shift = 3,
 132        },
 133        {
 134                .genpd.name = "A4R",
 135                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 136                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 137                .bit_shift = 5,
 138                .suspend = sh7372_a4r_pd_suspend,
 139                .resume = sh7372_intcs_resume,
 140        },
 141        {
 142                .genpd.name = "A3RV",
 143                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 144                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 145                .bit_shift = 6,
 146        },
 147        {
 148                .genpd.name = "A3RI",
 149                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 150                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 151                .bit_shift = 8,
 152        },
 153        {
 154                .genpd.name = "A4S",
 155                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 156                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 157                .bit_shift = 10,
 158                .gov = &pm_domain_always_on_gov,
 159                .no_debug = true,
 160                .suspend = sh7372_a4s_pd_suspend,
 161                .resume = sh7372_a4s_pd_resume,
 162        },
 163        {
 164                .genpd.name = "A3SP",
 165                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 166                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 167                .bit_shift = 11,
 168                .gov = &pm_domain_always_on_gov,
 169                .no_debug = true,
 170                .suspend = sh7372_a3sp_pd_suspend,
 171        },
 172        {
 173                .genpd.name = "A3SG",
 174                .genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 175                .genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
 176                .bit_shift = 13,
 177        },
 178};
 179
 180void __init sh7372_init_pm_domains(void)
 181{
 182        rmobile_init_domains(sh7372_pm_domains, ARRAY_SIZE(sh7372_pm_domains));
 183        pm_genpd_add_subdomain_names("A4LC", "A3RV");
 184        pm_genpd_add_subdomain_names("A4R", "A4LC");
 185        pm_genpd_add_subdomain_names("A4S", "A3SG");
 186        pm_genpd_add_subdomain_names("A4S", "A3SP");
 187}
 188
 189#endif /* CONFIG_PM */
 190
 191#if defined(CONFIG_SUSPEND) || defined(CONFIG_CPU_IDLE)
 192static void sh7372_set_reset_vector(unsigned long address)
 193{
 194        /* set reset vector, translate 4k */
 195        __raw_writel(address, SBAR);
 196        __raw_writel(0, APARMBAREA);
 197}
 198
 199static void sh7372_enter_sysc(int pllc0_on, unsigned long sleep_mode)
 200{
 201        if (pllc0_on)
 202                __raw_writel(0, PLLC01STPCR);
 203        else
 204                __raw_writel(1 << 28, PLLC01STPCR);
 205
 206        __raw_readl(WUPSFAC); /* read wakeup int. factor before sleep */
 207        cpu_suspend(sleep_mode, sh7372_do_idle_sysc);
 208        __raw_readl(WUPSFAC); /* read wakeup int. factor after wakeup */
 209
 210         /* disable reset vector translation */
 211        __raw_writel(0, SBAR);
 212}
 213
 214static int sh7372_sysc_valid(unsigned long *mskp, unsigned long *msk2p)
 215{
 216        unsigned long mstpsr0, mstpsr1, mstpsr2, mstpsr3, mstpsr4;
 217        unsigned long msk, msk2;
 218
 219        /* check active clocks to determine potential wakeup sources */
 220
 221        mstpsr0 = __raw_readl(MSTPSR0);
 222        if ((mstpsr0 & 0x00000003) != 0x00000003) {
 223                pr_debug("sh7372 mstpsr0 0x%08lx\n", mstpsr0);
 224                return 0;
 225        }
 226
 227        mstpsr1 = __raw_readl(MSTPSR1);
 228        if ((mstpsr1 & 0xff079b7f) != 0xff079b7f) {
 229                pr_debug("sh7372 mstpsr1 0x%08lx\n", mstpsr1);
 230                return 0;
 231        }
 232
 233        mstpsr2 = __raw_readl(MSTPSR2);
 234        if ((mstpsr2 & 0x000741ff) != 0x000741ff) {
 235                pr_debug("sh7372 mstpsr2 0x%08lx\n", mstpsr2);
 236                return 0;
 237        }
 238
 239        mstpsr3 = __raw_readl(MSTPSR3);
 240        if ((mstpsr3 & 0x1a60f010) != 0x1a60f010) {
 241                pr_debug("sh7372 mstpsr3 0x%08lx\n", mstpsr3);
 242                return 0;
 243        }
 244
 245        mstpsr4 = __raw_readl(MSTPSR4);
 246        if ((mstpsr4 & 0x00008cf0) != 0x00008cf0) {
 247                pr_debug("sh7372 mstpsr4 0x%08lx\n", mstpsr4);
 248                return 0;
 249        }
 250
 251        msk = 0;
 252        msk2 = 0;
 253
 254        /* make bitmaps of limited number of wakeup sources */
 255
 256        if ((mstpsr2 & (1 << 23)) == 0) /* SPU2 */
 257                msk |= 1 << 31;
 258
 259        if ((mstpsr2 & (1 << 12)) == 0) /* MFI_MFIM */
 260                msk |= 1 << 21;
 261
 262        if ((mstpsr4 & (1 << 3)) == 0) /* KEYSC */
 263                msk |= 1 << 2;
 264
 265        if ((mstpsr1 & (1 << 24)) == 0) /* CMT0 */
 266                msk |= 1 << 1;
 267
 268        if ((mstpsr3 & (1 << 29)) == 0) /* CMT1 */
 269                msk |= 1 << 1;
 270
 271        if ((mstpsr4 & (1 << 0)) == 0) /* CMT2 */
 272                msk |= 1 << 1;
 273
 274        if ((mstpsr2 & (1 << 13)) == 0) /* MFI_MFIS */
 275                msk2 |= 1 << 17;
 276
 277        *mskp = msk;
 278        *msk2p = msk2;
 279
 280        return 1;
 281}
 282
 283static void sh7372_icr_to_irqcr(unsigned long icr, u16 *irqcr1p, u16 *irqcr2p)
 284{
 285        u16 tmp, irqcr1, irqcr2;
 286        int k;
 287
 288        irqcr1 = 0;
 289        irqcr2 = 0;
 290
 291        /* convert INTCA ICR register layout to SYSC IRQCR+IRQCR2 */
 292        for (k = 0; k <= 7; k++) {
 293                tmp = (icr >> ((7 - k) * 4)) & 0xf;
 294                irqcr1 |= (tmp & 0x03) << (k * 2);
 295                irqcr2 |= (tmp >> 2) << (k * 2);
 296        }
 297
 298        *irqcr1p = irqcr1;
 299        *irqcr2p = irqcr2;
 300}
 301
 302static void sh7372_setup_sysc(unsigned long msk, unsigned long msk2)
 303{
 304        u16 irqcrx_low, irqcrx_high, irqcry_low, irqcry_high;
 305        unsigned long tmp;
 306
 307        /* read IRQ0A -> IRQ15A mask */
 308        tmp = bitrev8(__raw_readb(INTMSK00A));
 309        tmp |= bitrev8(__raw_readb(INTMSK10A)) << 8;
 310
 311        /* setup WUPSMSK from clocks and external IRQ mask */
 312        msk = (~msk & 0xc030000f) | (tmp << 4);
 313        __raw_writel(msk, WUPSMSK);
 314
 315        /* propage level/edge trigger for external IRQ 0->15 */
 316        sh7372_icr_to_irqcr(__raw_readl(ICR1A), &irqcrx_low, &irqcry_low);
 317        sh7372_icr_to_irqcr(__raw_readl(ICR2A), &irqcrx_high, &irqcry_high);
 318        __raw_writel((irqcrx_high << 16) | irqcrx_low, IRQCR);
 319        __raw_writel((irqcry_high << 16) | irqcry_low, IRQCR2);
 320
 321        /* read IRQ16A -> IRQ31A mask */
 322        tmp = bitrev8(__raw_readb(INTMSK20A));
 323        tmp |= bitrev8(__raw_readb(INTMSK30A)) << 8;
 324
 325        /* setup WUPSMSK2 from clocks and external IRQ mask */
 326        msk2 = (~msk2 & 0x00030000) | tmp;
 327        __raw_writel(msk2, WUPSMSK2);
 328
 329        /* propage level/edge trigger for external IRQ 16->31 */
 330        sh7372_icr_to_irqcr(__raw_readl(ICR3A), &irqcrx_low, &irqcry_low);
 331        sh7372_icr_to_irqcr(__raw_readl(ICR4A), &irqcrx_high, &irqcry_high);
 332        __raw_writel((irqcrx_high << 16) | irqcrx_low, IRQCR3);
 333        __raw_writel((irqcry_high << 16) | irqcry_low, IRQCR4);
 334}
 335
 336static void sh7372_enter_a3sm_common(int pllc0_on)
 337{
 338        /* use INTCA together with SYSC for wakeup */
 339        sh7372_setup_sysc(1 << 0, 0);
 340        sh7372_set_reset_vector(__pa(sh7372_resume_core_standby_sysc));
 341        sh7372_enter_sysc(pllc0_on, 1 << 12);
 342}
 343
 344static void sh7372_enter_a4s_common(int pllc0_on)
 345{
 346        sh7372_intca_suspend();
 347        sh7372_set_reset_vector(SMFRAM);
 348        sh7372_enter_sysc(pllc0_on, 1 << 10);
 349        sh7372_intca_resume();
 350}
 351
 352static void sh7372_pm_setup_smfram(void)
 353{
 354        memcpy((void *)SMFRAM, sh7372_resume_core_standby_sysc, 0x100);
 355}
 356#else
 357static inline void sh7372_pm_setup_smfram(void) {}
 358#endif /* CONFIG_SUSPEND || CONFIG_CPU_IDLE */
 359
 360#ifdef CONFIG_CPU_IDLE
 361static int sh7372_do_idle_core_standby(unsigned long unused)
 362{
 363        cpu_do_idle(); /* WFI when SYSTBCR == 0x10 -> Core Standby */
 364        return 0;
 365}
 366
 367static int sh7372_enter_core_standby(struct cpuidle_device *dev,
 368                                     struct cpuidle_driver *drv, int index)
 369{
 370        sh7372_set_reset_vector(__pa(sh7372_resume_core_standby_sysc));
 371
 372        /* enter sleep mode with SYSTBCR to 0x10 */
 373        __raw_writel(0x10, SYSTBCR);
 374        cpu_suspend(0, sh7372_do_idle_core_standby);
 375        __raw_writel(0, SYSTBCR);
 376
 377         /* disable reset vector translation */
 378        __raw_writel(0, SBAR);
 379
 380        return 1;
 381}
 382
 383static int sh7372_enter_a3sm_pll_on(struct cpuidle_device *dev,
 384                                    struct cpuidle_driver *drv, int index)
 385{
 386        sh7372_enter_a3sm_common(1);
 387        return 2;
 388}
 389
 390static int sh7372_enter_a3sm_pll_off(struct cpuidle_device *dev,
 391                                     struct cpuidle_driver *drv, int index)
 392{
 393        sh7372_enter_a3sm_common(0);
 394        return 3;
 395}
 396
 397static int sh7372_enter_a4s(struct cpuidle_device *dev,
 398                            struct cpuidle_driver *drv, int index)
 399{
 400        unsigned long msk, msk2;
 401
 402        if (!sh7372_sysc_valid(&msk, &msk2))
 403                return sh7372_enter_a3sm_pll_off(dev, drv, index);
 404
 405        sh7372_setup_sysc(msk, msk2);
 406        sh7372_enter_a4s_common(0);
 407        return 4;
 408}
 409
 410static struct cpuidle_driver sh7372_cpuidle_driver = {
 411        .name                   = "sh7372_cpuidle",
 412        .owner                  = THIS_MODULE,
 413        .state_count            = 5,
 414        .safe_state_index       = 0, /* C1 */
 415        .states[0] = ARM_CPUIDLE_WFI_STATE,
 416        .states[1] = {
 417                .name = "C2",
 418                .desc = "Core Standby Mode",
 419                .exit_latency = 10,
 420                .target_residency = 20 + 10,
 421                .flags = CPUIDLE_FLAG_TIME_VALID,
 422                .enter = sh7372_enter_core_standby,
 423        },
 424        .states[2] = {
 425                .name = "C3",
 426                .desc = "A3SM PLL ON",
 427                .exit_latency = 20,
 428                .target_residency = 30 + 20,
 429                .flags = CPUIDLE_FLAG_TIME_VALID,
 430                .enter = sh7372_enter_a3sm_pll_on,
 431        },
 432        .states[3] = {
 433                .name = "C4",
 434                .desc = "A3SM PLL OFF",
 435                .exit_latency = 120,
 436                .target_residency = 30 + 120,
 437                .flags = CPUIDLE_FLAG_TIME_VALID,
 438                .enter = sh7372_enter_a3sm_pll_off,
 439        },
 440        .states[4] = {
 441                .name = "C5",
 442                .desc = "A4S PLL OFF",
 443                .exit_latency = 240,
 444                .target_residency = 30 + 240,
 445                .flags = CPUIDLE_FLAG_TIME_VALID,
 446                .enter = sh7372_enter_a4s,
 447                .disabled = true,
 448        },
 449};
 450
 451static void __init sh7372_cpuidle_init(void)
 452{
 453        shmobile_cpuidle_set_driver(&sh7372_cpuidle_driver);
 454}
 455#else
 456static void __init sh7372_cpuidle_init(void) {}
 457#endif
 458
 459#ifdef CONFIG_SUSPEND
 460static int sh7372_enter_suspend(suspend_state_t suspend_state)
 461{
 462        unsigned long msk, msk2;
 463
 464        /* check active clocks to determine potential wakeup sources */
 465        if (sh7372_sysc_valid(&msk, &msk2) && a4s_suspend_ready) {
 466                /* convert INTC mask/sense to SYSC mask/sense */
 467                sh7372_setup_sysc(msk, msk2);
 468
 469                /* enter A4S sleep with PLLC0 off */
 470                pr_debug("entering A4S\n");
 471                sh7372_enter_a4s_common(0);
 472                return 0;
 473        }
 474
 475        /* default to enter A3SM sleep with PLLC0 off */
 476        pr_debug("entering A3SM\n");
 477        sh7372_enter_a3sm_common(0);
 478        return 0;
 479}
 480
 481/**
 482 * sh7372_pm_notifier_fn - SH7372 PM notifier routine.
 483 * @notifier: Unused.
 484 * @pm_event: Event being handled.
 485 * @unused: Unused.
 486 */
 487static int sh7372_pm_notifier_fn(struct notifier_block *notifier,
 488                                 unsigned long pm_event, void *unused)
 489{
 490        switch (pm_event) {
 491        case PM_SUSPEND_PREPARE:
 492                /*
 493                 * This is necessary, because the A4R domain has to be "on"
 494                 * when suspend_device_irqs() and resume_device_irqs() are
 495                 * executed during system suspend and resume, respectively, so
 496                 * that those functions don't crash while accessing the INTCS.
 497                 */
 498                pm_genpd_name_poweron("A4R");
 499                break;
 500        case PM_POST_SUSPEND:
 501                pm_genpd_poweroff_unused();
 502                break;
 503        }
 504
 505        return NOTIFY_DONE;
 506}
 507
 508static void sh7372_suspend_init(void)
 509{
 510        shmobile_suspend_ops.enter = sh7372_enter_suspend;
 511        pm_notifier(sh7372_pm_notifier_fn, 0);
 512}
 513#else
 514static void sh7372_suspend_init(void) {}
 515#endif
 516
 517void __init sh7372_pm_init(void)
 518{
 519        /* enable DBG hardware block to kick SYSC */
 520        __raw_writel(0x0000a500, DBGREG9);
 521        __raw_writel(0x0000a501, DBGREG9);
 522        __raw_writel(0x00000000, DBGREG1);
 523
 524        /* do not convert A3SM, A3SP, A3SG, A4R power down into A4S */
 525        __raw_writel(0, PDNSEL);
 526
 527        sh7372_pm_setup_smfram();
 528
 529        sh7372_suspend_init();
 530        sh7372_cpuidle_init();
 531}
 532
 533void __init sh7372_pm_init_late(void)
 534{
 535        shmobile_init_late();
 536        pm_genpd_name_attach_cpuidle("A4S", 4);
 537}
 538
Hosted by Missing Link Electronics. The original LXR software by the LXR community, this experimental version by lxr@linux.no.