arch/arm/mach-exynos4/pm.c

   1 /* linux/arch/arm/mach-exynos4/pm.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * EXYNOS4210 - Power Management support
   7  *
   8  * Based on arch/arm/mach-s3c2410/pm.c
   9  * Copyright (c) 2006 Simtec Electronics
  10  *      Ben Dooks <ben@simtec.co.uk>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15 */
  16
  17 #include <linux/init.h>
  18 #include <linux/suspend.h>
  19 #include <linux/syscore_ops.h>
  20 #include <linux/io.h>
  21 #include <linux/err.h>
  22 #include <linux/clk.h>
  23
  24 #include <asm/cacheflush.h>
  25 #include <asm/hardware/cache-l2x0.h>
  26
  27 #include <plat/cpu.h>
  28 #include <plat/pm.h>
  29 #include <plat/pll.h>
  30 #include <plat/regs-srom.h>
  31
  32 #include <mach/regs-irq.h>
  33 #include <mach/regs-gpio.h>
  34 #include <mach/regs-clock.h>
  35 #include <mach/regs-pmu.h>
  36 #include <mach/pm-core.h>
  37 #include <mach/pmu.h>
  38
  39 static struct sleep_save exynos4_set_clksrc[] = {
  40         { .reg = S5P_CLKSRC_MASK_TOP                    , .val = 0x00000001, },
  41         { .reg = S5P_CLKSRC_MASK_CAM                    , .val = 0x11111111, },
  42         { .reg = S5P_CLKSRC_MASK_TV                     , .val = 0x00000111, },
  43         { .reg = S5P_CLKSRC_MASK_LCD0                   , .val = 0x00001111, },
  44         { .reg = S5P_CLKSRC_MASK_MAUDIO                 , .val = 0x00000001, },
  45         { .reg = S5P_CLKSRC_MASK_FSYS                   , .val = 0x01011111, },
  46         { .reg = S5P_CLKSRC_MASK_PERIL0                 , .val = 0x01111111, },
  47         { .reg = S5P_CLKSRC_MASK_PERIL1                 , .val = 0x01110111, },
  48         { .reg = S5P_CLKSRC_MASK_DMC                    , .val = 0x00010000, },
  49 };
  50
  51 static struct sleep_save exynos4210_set_clksrc[] = {
  52         { .reg = S5P_CLKSRC_MASK_LCD1                   , .val = 0x00001111, },
  53 };
  54
  55 static struct sleep_save exynos4_epll_save[] = {
  56         SAVE_ITEM(S5P_EPLL_CON0),
  57         SAVE_ITEM(S5P_EPLL_CON1),
  58 };
  59
  60 static struct sleep_save exynos4_vpll_save[] = {
  61         SAVE_ITEM(S5P_VPLL_CON0),
  62         SAVE_ITEM(S5P_VPLL_CON1),
  63 };
  64
  65 static struct sleep_save exynos4_core_save[] = {
  66         /* GIC side */
  67         SAVE_ITEM(S5P_VA_GIC_CPU + 0x000),
  68         SAVE_ITEM(S5P_VA_GIC_CPU + 0x004),
  69         SAVE_ITEM(S5P_VA_GIC_CPU + 0x008),
  70         SAVE_ITEM(S5P_VA_GIC_CPU + 0x00C),
  71         SAVE_ITEM(S5P_VA_GIC_CPU + 0x014),
  72         SAVE_ITEM(S5P_VA_GIC_CPU + 0x018),
  73         SAVE_ITEM(S5P_VA_GIC_DIST + 0x000),
  74         SAVE_ITEM(S5P_VA_GIC_DIST + 0x004),
  75         SAVE_ITEM(S5P_VA_GIC_DIST + 0x100),
  76         SAVE_ITEM(S5P_VA_GIC_DIST + 0x104),
  77         SAVE_ITEM(S5P_VA_GIC_DIST + 0x108),
  78         SAVE_ITEM(S5P_VA_GIC_DIST + 0x300),
  79         SAVE_ITEM(S5P_VA_GIC_DIST + 0x304),
  80         SAVE_ITEM(S5P_VA_GIC_DIST + 0x308),
  81         SAVE_ITEM(S5P_VA_GIC_DIST + 0x400),
  82         SAVE_ITEM(S5P_VA_GIC_DIST + 0x404),
  83         SAVE_ITEM(S5P_VA_GIC_DIST + 0x408),
  84         SAVE_ITEM(S5P_VA_GIC_DIST + 0x40C),
  85         SAVE_ITEM(S5P_VA_GIC_DIST + 0x410),
  86         SAVE_ITEM(S5P_VA_GIC_DIST + 0x414),
  87         SAVE_ITEM(S5P_VA_GIC_DIST + 0x418),
  88         SAVE_ITEM(S5P_VA_GIC_DIST + 0x41C),
  89         SAVE_ITEM(S5P_VA_GIC_DIST + 0x420),
  90         SAVE_ITEM(S5P_VA_GIC_DIST + 0x424),
  91         SAVE_ITEM(S5P_VA_GIC_DIST + 0x428),
  92         SAVE_ITEM(S5P_VA_GIC_DIST + 0x42C),
  93         SAVE_ITEM(S5P_VA_GIC_DIST + 0x430),
  94         SAVE_ITEM(S5P_VA_GIC_DIST + 0x434),
  95         SAVE_ITEM(S5P_VA_GIC_DIST + 0x438),
  96         SAVE_ITEM(S5P_VA_GIC_DIST + 0x43C),
  97         SAVE_ITEM(S5P_VA_GIC_DIST + 0x440),
  98         SAVE_ITEM(S5P_VA_GIC_DIST + 0x444),
  99         SAVE_ITEM(S5P_VA_GIC_DIST + 0x448),
 100         SAVE_ITEM(S5P_VA_GIC_DIST + 0x44C),
 101         SAVE_ITEM(S5P_VA_GIC_DIST + 0x450),
 102         SAVE_ITEM(S5P_VA_GIC_DIST + 0x454),
 103         SAVE_ITEM(S5P_VA_GIC_DIST + 0x458),
 104         SAVE_ITEM(S5P_VA_GIC_DIST + 0x45C),
 105
 106         SAVE_ITEM(S5P_VA_GIC_DIST + 0x800),
 107         SAVE_ITEM(S5P_VA_GIC_DIST + 0x804),
 108         SAVE_ITEM(S5P_VA_GIC_DIST + 0x808),
 109         SAVE_ITEM(S5P_VA_GIC_DIST + 0x80C),
 110         SAVE_ITEM(S5P_VA_GIC_DIST + 0x810),
 111         SAVE_ITEM(S5P_VA_GIC_DIST + 0x814),
 112         SAVE_ITEM(S5P_VA_GIC_DIST + 0x818),
 113         SAVE_ITEM(S5P_VA_GIC_DIST + 0x81C),
 114         SAVE_ITEM(S5P_VA_GIC_DIST + 0x820),
 115         SAVE_ITEM(S5P_VA_GIC_DIST + 0x824),
 116         SAVE_ITEM(S5P_VA_GIC_DIST + 0x828),
 117         SAVE_ITEM(S5P_VA_GIC_DIST + 0x82C),
 118         SAVE_ITEM(S5P_VA_GIC_DIST + 0x830),
 119         SAVE_ITEM(S5P_VA_GIC_DIST + 0x834),
 120         SAVE_ITEM(S5P_VA_GIC_DIST + 0x838),
 121         SAVE_ITEM(S5P_VA_GIC_DIST + 0x83C),
 122         SAVE_ITEM(S5P_VA_GIC_DIST + 0x840),
 123         SAVE_ITEM(S5P_VA_GIC_DIST + 0x844),
 124         SAVE_ITEM(S5P_VA_GIC_DIST + 0x848),
 125         SAVE_ITEM(S5P_VA_GIC_DIST + 0x84C),
 126         SAVE_ITEM(S5P_VA_GIC_DIST + 0x850),
 127         SAVE_ITEM(S5P_VA_GIC_DIST + 0x854),
 128         SAVE_ITEM(S5P_VA_GIC_DIST + 0x858),
 129         SAVE_ITEM(S5P_VA_GIC_DIST + 0x85C),
 130
 131         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC00),
 132         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC04),
 133         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC08),
 134         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC0C),
 135         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC10),
 136         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC14),
 137
 138         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x000),
 139         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x010),
 140         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x020),
 141         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x030),
 142         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x040),
 143         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x050),
 144         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x060),
 145         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x070),
 146         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x080),
 147         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x090),
 148
 149         /* SROM side */
 150         SAVE_ITEM(S5P_SROM_BW),
 151         SAVE_ITEM(S5P_SROM_BC0),
 152         SAVE_ITEM(S5P_SROM_BC1),
 153         SAVE_ITEM(S5P_SROM_BC2),
 154         SAVE_ITEM(S5P_SROM_BC3),
 155 };
 156
 157 static struct sleep_save exynos4_l2cc_save[] = {
 158         SAVE_ITEM(S5P_VA_L2CC + L2X0_TAG_LATENCY_CTRL),
 159         SAVE_ITEM(S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL),
 160         SAVE_ITEM(S5P_VA_L2CC + L2X0_PREFETCH_CTRL),
 161         SAVE_ITEM(S5P_VA_L2CC + L2X0_POWER_CTRL),
 162         SAVE_ITEM(S5P_VA_L2CC + L2X0_AUX_CTRL),
 163 };
 164
 165 /* For Cortex-A9 Diagnostic and Power control register */
 166 static unsigned int save_arm_register[2];
 167
 168 static int exynos4_cpu_suspend(unsigned long arg)
 169 {
 170         outer_flush_all();
 171
 172         /* issue the standby signal into the pm unit. */
 173         cpu_do_idle();
 174
 175         /* we should never get past here */
 176         panic("sleep resumed to originator?");
 177 }
 178
 179 static void exynos4_pm_prepare(void)
 180 {
 181         u32 tmp;
 182
 183         s3c_pm_do_save(exynos4_core_save, ARRAY_SIZE(exynos4_core_save));
 184         s3c_pm_do_save(exynos4_l2cc_save, ARRAY_SIZE(exynos4_l2cc_save));
 185         s3c_pm_do_save(exynos4_epll_save, ARRAY_SIZE(exynos4_epll_save));
 186         s3c_pm_do_save(exynos4_vpll_save, ARRAY_SIZE(exynos4_vpll_save));
 187
 188         tmp = __raw_readl(S5P_INFORM1);
 189
 190         /* Set value of power down register for sleep mode */
 191
 192         exynos4_sys_powerdown_conf(SYS_SLEEP);
 193         __raw_writel(S5P_CHECK_SLEEP, S5P_INFORM1);
 194
 195         /* ensure at least INFORM0 has the resume address */
 196
 197         __raw_writel(virt_to_phys(s3c_cpu_resume), S5P_INFORM0);
 198
 199         /* Before enter central sequence mode, clock src register have to set */
 200
 201         s3c_pm_do_restore_core(exynos4_set_clksrc, ARRAY_SIZE(exynos4_set_clksrc));
 202
 203         if (soc_is_exynos4210())
 204                 s3c_pm_do_restore_core(exynos4210_set_clksrc, ARRAY_SIZE(exynos4210_set_clksrc));
 205
 206 }
 207
 208 static int exynos4_pm_add(struct sys_device *sysdev)
 209 {
 210         pm_cpu_prep = exynos4_pm_prepare;
 211         pm_cpu_sleep = exynos4_cpu_suspend;
 212
 213         return 0;
 214 }
 215
 216 /* This function copy from linux/arch/arm/kernel/smp_scu.c */
 217
 218 void exynos4_scu_enable(void __iomem *scu_base)
 219 {
 220         u32 scu_ctrl;
 221
 222         scu_ctrl = __raw_readl(scu_base);
 223         /* already enabled? */
 224         if (scu_ctrl & 1)
 225                 return;
 226
 227         scu_ctrl |= 1;
 228         __raw_writel(scu_ctrl, scu_base);
 229
 230         /*
 231          * Ensure that the data accessed by CPU0 before the SCU was
 232          * initialised is visible to the other CPUs.
 233          */
 234         flush_cache_all();
 235 }
 236
 237 static unsigned long pll_base_rate;
 238
 239 static void exynos4_restore_pll(void)
 240 {
 241         unsigned long pll_con, locktime, lockcnt;
 242         unsigned long pll_in_rate;
 243         unsigned int p_div, epll_wait = 0, vpll_wait = 0;
 244
 245         if (pll_base_rate == 0)
 246                 return;
 247
 248         pll_in_rate = pll_base_rate;
 249
 250         /* EPLL */
 251         pll_con = exynos4_epll_save[0].val;
 252
 253         if (pll_con & (1 << 31)) {
 254                 pll_con &= (PLL46XX_PDIV_MASK << PLL46XX_PDIV_SHIFT);
 255                 p_div = (pll_con >> PLL46XX_PDIV_SHIFT);
 256
 257                 pll_in_rate /= 1000000;
 258
 259                 locktime = (3000 / pll_in_rate) * p_div;
 260                 lockcnt = locktime * 10000 / (10000 / pll_in_rate);
 261
 262                 __raw_writel(lockcnt, S5P_EPLL_LOCK);
 263
 264                 s3c_pm_do_restore_core(exynos4_epll_save,
 265                                         ARRAY_SIZE(exynos4_epll_save));
 266                 epll_wait = 1;
 267         }
 268
 269         pll_in_rate = pll_base_rate;
 270
 271         /* VPLL */
 272         pll_con = exynos4_vpll_save[0].val;
 273
 274         if (pll_con & (1 << 31)) {
 275                 pll_in_rate /= 1000000;
 276                 /* 750us */
 277                 locktime = 750;
 278                 lockcnt = locktime * 10000 / (10000 / pll_in_rate);
 279
 280                 __raw_writel(lockcnt, S5P_VPLL_LOCK);
 281
 282                 s3c_pm_do_restore_core(exynos4_vpll_save,
 283                                         ARRAY_SIZE(exynos4_vpll_save));
 284                 vpll_wait = 1;
 285         }
 286
 287         /* Wait PLL locking */
 288
 289         do {
 290                 if (epll_wait) {
 291                         pll_con = __raw_readl(S5P_EPLL_CON0);
 292                         if (pll_con & (1 << S5P_EPLLCON0_LOCKED_SHIFT))
 293                                 epll_wait = 0;
 294                 }
 295
 296                 if (vpll_wait) {
 297                         pll_con = __raw_readl(S5P_VPLL_CON0);
 298                         if (pll_con & (1 << S5P_VPLLCON0_LOCKED_SHIFT))
 299                                 vpll_wait = 0;
 300                 }
 301         } while (epll_wait || vpll_wait);
 302 }
 303
 304 static struct sysdev_driver exynos4_pm_driver = {
 305         .add            = exynos4_pm_add,
 306 };
 307
 308 static __init int exynos4_pm_drvinit(void)
 309 {
 310         struct clk *pll_base;
 311         unsigned int tmp;
 312
 313         s3c_pm_init();
 314
 315         /* All wakeup disable */
 316
 317         tmp = __raw_readl(S5P_WAKEUP_MASK);
 318         tmp |= ((0xFF << 8) | (0x1F << 1));
 319         __raw_writel(tmp, S5P_WAKEUP_MASK);
 320
 321         pll_base = clk_get(NULL, "xtal");
 322
 323         if (!IS_ERR(pll_base)) {
 324                 pll_base_rate = clk_get_rate(pll_base);
 325                 clk_put(pll_base);
 326         }
 327
 328         return sysdev_driver_register(&exynos4_sysclass, &exynos4_pm_driver);
 329 }
 330 arch_initcall(exynos4_pm_drvinit);
 331
 332 static int exynos4_pm_suspend(void)
 333 {
 334         unsigned long tmp;
 335
 336         /* Setting Central Sequence Register for power down mode */
 337
 338         tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
 339         tmp &= ~S5P_CENTRAL_LOWPWR_CFG;
 340         __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
 341
 342         /* Save Power control register */
 343         asm ("mrc p15, 0, %0, c15, c0, 0"
 344              : "=r" (tmp) : : "cc");
 345         save_arm_register[0] = tmp;
 346
 347         /* Save Diagnostic register */
 348         asm ("mrc p15, 0, %0, c15, c0, 1"
 349              : "=r" (tmp) : : "cc");
 350         save_arm_register[1] = tmp;
 351
 352         return 0;
 353 }
 354
 355 static void exynos4_pm_resume(void)
 356 {
 357         unsigned long tmp;
 358
 359         /*
 360          * If PMU failed while entering sleep mode, WFI will be
 361          * ignored by PMU and then exiting cpu_do_idle().
 362          * S5P_CENTRAL_LOWPWR_CFG bit will not be set automatically
 363          * in this situation.
 364          */
 365         tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
 366         if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) {
 367                 tmp |= S5P_CENTRAL_LOWPWR_CFG;
 368                 __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
 369                 /* No need to perform below restore code */
 370                 goto early_wakeup;
 371         }
 372         /* Restore Power control register */
 373         tmp = save_arm_register[0];
 374         asm volatile ("mcr p15, 0, %0, c15, c0, 0"
 375                       : : "r" (tmp)
 376                       : "cc");
 377
 378         /* Restore Diagnostic register */
 379         tmp = save_arm_register[1];
 380         asm volatile ("mcr p15, 0, %0, c15, c0, 1"
 381                       : : "r" (tmp)
 382                       : "cc");
 383
 384         /* For release retention */
 385
 386         __raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION);
 387         __raw_writel((1 << 28), S5P_PAD_RET_GPIO_OPTION);
 388         __raw_writel((1 << 28), S5P_PAD_RET_UART_OPTION);
 389         __raw_writel((1 << 28), S5P_PAD_RET_MMCA_OPTION);
 390         __raw_writel((1 << 28), S5P_PAD_RET_MMCB_OPTION);
 391         __raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION);
 392         __raw_writel((1 << 28), S5P_PAD_RET_EBIB_OPTION);
 393
 394         s3c_pm_do_restore_core(exynos4_core_save, ARRAY_SIZE(exynos4_core_save));
 395
 396         exynos4_restore_pll();
 397
 398         exynos4_scu_enable(S5P_VA_SCU);
 399
 400 #ifdef CONFIG_CACHE_L2X0
 401         s3c_pm_do_restore_core(exynos4_l2cc_save, ARRAY_SIZE(exynos4_l2cc_save));
 402         outer_inv_all();
 403         /* enable L2X0*/
 404         writel_relaxed(1, S5P_VA_L2CC + L2X0_CTRL);
 405 #endif
 406
 407 early_wakeup:
 408         return;
 409 }
 410
 411 static struct syscore_ops exynos4_pm_syscore_ops = {
 412         .suspend        = exynos4_pm_suspend,
 413         .resume         = exynos4_pm_resume,
 414 };
 415
 416 static __init int exynos4_pm_syscore_init(void)
 417 {
 418         register_syscore_ops(&exynos4_pm_syscore_ops);
 419         return 0;
 420 }
 421 arch_initcall(exynos4_pm_syscore_init);