arch/arm/mach-exynos/pm.c

   1 /*
   2  * Copyright (c) 2011-2012 Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com
   4  *
   5  * EXYNOS - Power Management support
   6  *
   7  * Based on arch/arm/mach-s3c2410/pm.c
   8  * Copyright (c) 2006 Simtec Electronics
   9  *      Ben Dooks <ben@simtec.co.uk>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14 */
  15
  16 #include <linux/init.h>
  17 #include <linux/suspend.h>
  18 #include <linux/syscore_ops.h>
  19 #include <linux/io.h>
  20 #include <linux/err.h>
  21 #include <linux/clk.h>
  22
  23 #include <asm/cacheflush.h>
  24 #include <asm/hardware/cache-l2x0.h>
  25 #include <asm/smp_scu.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 = EXYNOS4_CLKSRC_MASK_TOP                , .val = 0x00000001, },
  41         { .reg = EXYNOS4_CLKSRC_MASK_CAM                , .val = 0x11111111, },
  42         { .reg = EXYNOS4_CLKSRC_MASK_TV                 , .val = 0x00000111, },
  43         { .reg = EXYNOS4_CLKSRC_MASK_LCD0               , .val = 0x00001111, },
  44         { .reg = EXYNOS4_CLKSRC_MASK_MAUDIO             , .val = 0x00000001, },
  45         { .reg = EXYNOS4_CLKSRC_MASK_FSYS               , .val = 0x01011111, },
  46         { .reg = EXYNOS4_CLKSRC_MASK_PERIL0             , .val = 0x01111111, },
  47         { .reg = EXYNOS4_CLKSRC_MASK_PERIL1             , .val = 0x01110111, },
  48         { .reg = EXYNOS4_CLKSRC_MASK_DMC                , .val = 0x00010000, },
  49 };
  50
  51 static struct sleep_save exynos4210_set_clksrc[] = {
  52         { .reg = EXYNOS4210_CLKSRC_MASK_LCD1            , .val = 0x00001111, },
  53 };
  54
  55 static struct sleep_save exynos4_epll_save[] = {
  56         SAVE_ITEM(EXYNOS4_EPLL_CON0),
  57         SAVE_ITEM(EXYNOS4_EPLL_CON1),
  58 };
  59
  60 static struct sleep_save exynos4_vpll_save[] = {
  61         SAVE_ITEM(EXYNOS4_VPLL_CON0),
  62         SAVE_ITEM(EXYNOS4_VPLL_CON1),
  63 };
  64
  65 static struct sleep_save exynos_core_save[] = {
  66         /* SROM side */
  67         SAVE_ITEM(S5P_SROM_BW),
  68         SAVE_ITEM(S5P_SROM_BC0),
  69         SAVE_ITEM(S5P_SROM_BC1),
  70         SAVE_ITEM(S5P_SROM_BC2),
  71         SAVE_ITEM(S5P_SROM_BC3),
  72 };
  73
  74
  75 /* For Cortex-A9 Diagnostic and Power control register */
  76 static unsigned int save_arm_register[2];
  77
  78 static int exynos_cpu_suspend(unsigned long arg)
  79 {
  80 #ifdef CONFIG_CACHE_L2X0
  81         outer_flush_all();
  82 #endif
  83
  84         /* issue the standby signal into the pm unit. */
  85         cpu_do_idle();
  86
  87         /* we should never get past here */
  88         panic("sleep resumed to originator?");
  89 }
  90
  91 static void exynos_pm_prepare(void)
  92 {
  93         unsigned int tmp;
  94
  95         s3c_pm_do_save(exynos_core_save, ARRAY_SIZE(exynos_core_save));
  96
  97         if (!soc_is_exynos5250()) {
  98                 s3c_pm_do_save(exynos4_epll_save, ARRAY_SIZE(exynos4_epll_save));
  99                 s3c_pm_do_save(exynos4_vpll_save, ARRAY_SIZE(exynos4_vpll_save));
 100         } else {
 101                 /* Disable USE_RETENTION of JPEG_MEM_OPTION */
 102                 tmp = __raw_readl(EXYNOS5_JPEG_MEM_OPTION);
 103                 tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
 104                 __raw_writel(tmp, EXYNOS5_JPEG_MEM_OPTION);
 105         }
 106
 107         /* Set value of power down register for sleep mode */
 108
 109         exynos_sys_powerdown_conf(SYS_SLEEP);
 110         __raw_writel(S5P_CHECK_SLEEP, S5P_INFORM1);
 111
 112         /* ensure at least INFORM0 has the resume address */
 113
 114         __raw_writel(virt_to_phys(s3c_cpu_resume), S5P_INFORM0);
 115
 116         /* Before enter central sequence mode, clock src register have to set */
 117
 118         if (!soc_is_exynos5250())
 119                 s3c_pm_do_restore_core(exynos4_set_clksrc, ARRAY_SIZE(exynos4_set_clksrc));
 120
 121         if (soc_is_exynos4210())
 122                 s3c_pm_do_restore_core(exynos4210_set_clksrc, ARRAY_SIZE(exynos4210_set_clksrc));
 123
 124 }
 125
 126 static int exynos_pm_add(struct device *dev, struct subsys_interface *sif)
 127 {
 128         pm_cpu_prep = exynos_pm_prepare;
 129         pm_cpu_sleep = exynos_cpu_suspend;
 130
 131         return 0;
 132 }
 133
 134 static unsigned long pll_base_rate;
 135
 136 static void exynos4_restore_pll(void)
 137 {
 138         unsigned long pll_con, locktime, lockcnt;
 139         unsigned long pll_in_rate;
 140         unsigned int p_div, epll_wait = 0, vpll_wait = 0;
 141
 142         if (pll_base_rate == 0)
 143                 return;
 144
 145         pll_in_rate = pll_base_rate;
 146
 147         /* EPLL */
 148         pll_con = exynos4_epll_save[0].val;
 149
 150         if (pll_con & (1 << 31)) {
 151                 pll_con &= (PLL46XX_PDIV_MASK << PLL46XX_PDIV_SHIFT);
 152                 p_div = (pll_con >> PLL46XX_PDIV_SHIFT);
 153
 154                 pll_in_rate /= 1000000;
 155
 156                 locktime = (3000 / pll_in_rate) * p_div;
 157                 lockcnt = locktime * 10000 / (10000 / pll_in_rate);
 158
 159                 __raw_writel(lockcnt, EXYNOS4_EPLL_LOCK);
 160
 161                 s3c_pm_do_restore_core(exynos4_epll_save,
 162                                         ARRAY_SIZE(exynos4_epll_save));
 163                 epll_wait = 1;
 164         }
 165
 166         pll_in_rate = pll_base_rate;
 167
 168         /* VPLL */
 169         pll_con = exynos4_vpll_save[0].val;
 170
 171         if (pll_con & (1 << 31)) {
 172                 pll_in_rate /= 1000000;
 173                 /* 750us */
 174                 locktime = 750;
 175                 lockcnt = locktime * 10000 / (10000 / pll_in_rate);
 176
 177                 __raw_writel(lockcnt, EXYNOS4_VPLL_LOCK);
 178
 179                 s3c_pm_do_restore_core(exynos4_vpll_save,
 180                                         ARRAY_SIZE(exynos4_vpll_save));
 181                 vpll_wait = 1;
 182         }
 183
 184         /* Wait PLL locking */
 185
 186         do {
 187                 if (epll_wait) {
 188                         pll_con = __raw_readl(EXYNOS4_EPLL_CON0);
 189                         if (pll_con & (1 << EXYNOS4_EPLLCON0_LOCKED_SHIFT))
 190                                 epll_wait = 0;
 191                 }
 192
 193                 if (vpll_wait) {
 194                         pll_con = __raw_readl(EXYNOS4_VPLL_CON0);
 195                         if (pll_con & (1 << EXYNOS4_VPLLCON0_LOCKED_SHIFT))
 196                                 vpll_wait = 0;
 197                 }
 198         } while (epll_wait || vpll_wait);
 199 }
 200
 201 static struct subsys_interface exynos_pm_interface = {
 202         .name           = "exynos_pm",
 203         .subsys         = &exynos_subsys,
 204         .add_dev        = exynos_pm_add,
 205 };
 206
 207 static __init int exynos_pm_drvinit(void)
 208 {
 209         struct clk *pll_base;
 210         unsigned int tmp;
 211
 212         s3c_pm_init();
 213
 214         /* All wakeup disable */
 215
 216         tmp = __raw_readl(S5P_WAKEUP_MASK);
 217         tmp |= ((0xFF << 8) | (0x1F << 1));
 218         __raw_writel(tmp, S5P_WAKEUP_MASK);
 219
 220         if (!soc_is_exynos5250()) {
 221                 pll_base = clk_get(NULL, "xtal");
 222
 223                 if (!IS_ERR(pll_base)) {
 224                         pll_base_rate = clk_get_rate(pll_base);
 225                         clk_put(pll_base);
 226                 }
 227         }
 228
 229         return subsys_interface_register(&exynos_pm_interface);
 230 }
 231 arch_initcall(exynos_pm_drvinit);
 232
 233 static int exynos_pm_suspend(void)
 234 {
 235         unsigned long tmp;
 236
 237         /* Setting Central Sequence Register for power down mode */
 238
 239         tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
 240         tmp &= ~S5P_CENTRAL_LOWPWR_CFG;
 241         __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
 242
 243         /* Setting SEQ_OPTION register */
 244
 245         tmp = (S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0);
 246         __raw_writel(tmp, S5P_CENTRAL_SEQ_OPTION);
 247
 248         if (!soc_is_exynos5250()) {
 249                 /* Save Power control register */
 250                 asm ("mrc p15, 0, %0, c15, c0, 0"
 251                      : "=r" (tmp) : : "cc");
 252                 save_arm_register[0] = tmp;
 253
 254                 /* Save Diagnostic register */
 255                 asm ("mrc p15, 0, %0, c15, c0, 1"
 256                      : "=r" (tmp) : : "cc");
 257                 save_arm_register[1] = tmp;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static void exynos_pm_resume(void)
 264 {
 265         unsigned long tmp;
 266
 267         /*
 268          * If PMU failed while entering sleep mode, WFI will be
 269          * ignored by PMU and then exiting cpu_do_idle().
 270          * S5P_CENTRAL_LOWPWR_CFG bit will not be set automatically
 271          * in this situation.
 272          */
 273         tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
 274         if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) {
 275                 tmp |= S5P_CENTRAL_LOWPWR_CFG;
 276                 __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
 277                 /* No need to perform below restore code */
 278                 goto early_wakeup;
 279         }
 280         if (!soc_is_exynos5250()) {
 281                 /* Restore Power control register */
 282                 tmp = save_arm_register[0];
 283                 asm volatile ("mcr p15, 0, %0, c15, c0, 0"
 284                               : : "r" (tmp)
 285                               : "cc");
 286
 287                 /* Restore Diagnostic register */
 288                 tmp = save_arm_register[1];
 289                 asm volatile ("mcr p15, 0, %0, c15, c0, 1"
 290                               : : "r" (tmp)
 291                               : "cc");
 292         }
 293
 294         /* For release retention */
 295
 296         __raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION);
 297         __raw_writel((1 << 28), S5P_PAD_RET_GPIO_OPTION);
 298         __raw_writel((1 << 28), S5P_PAD_RET_UART_OPTION);
 299         __raw_writel((1 << 28), S5P_PAD_RET_MMCA_OPTION);
 300         __raw_writel((1 << 28), S5P_PAD_RET_MMCB_OPTION);
 301         __raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION);
 302         __raw_writel((1 << 28), S5P_PAD_RET_EBIB_OPTION);
 303
 304         s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save));
 305
 306         if (!soc_is_exynos5250()) {
 307                 exynos4_restore_pll();
 308
 309 #ifdef CONFIG_SMP
 310                 scu_enable(S5P_VA_SCU);
 311 #endif
 312         }
 313
 314 early_wakeup:
 315         return;
 316 }
 317
 318 static struct syscore_ops exynos_pm_syscore_ops = {
 319         .suspend        = exynos_pm_suspend,
 320         .resume         = exynos_pm_resume,
 321 };
 322
 323 static __init int exynos_pm_syscore_init(void)
 324 {
 325         register_syscore_ops(&exynos_pm_syscore_ops);
 326         return 0;
 327 }
 328 arch_initcall(exynos_pm_syscore_init);