arch/arm/mach-exynos/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 #include <asm/smp_scu.h>
  27
  28 #include <plat/cpu.h>
  29 #include <plat/pm.h>
  30 #include <plat/pll.h>
  31 #include <plat/regs-srom.h>
  32
  33 #include <mach/regs-irq.h>
  34 #include <mach/regs-gpio.h>
  35 #include <mach/regs-clock.h>
  36 #include <mach/regs-pmu.h>
  37 #include <mach/pm-core.h>
  38 #include <mach/pmu.h>
  39
  40 static struct sleep_save exynos4_set_clksrc[] = {
  41         { .reg = EXYNOS4_CLKSRC_MASK_TOP                , .val = 0x00000001, },
  42         { .reg = EXYNOS4_CLKSRC_MASK_CAM                , .val = 0x11111111, },
  43         { .reg = EXYNOS4_CLKSRC_MASK_TV                 , .val = 0x00000111, },
  44         { .reg = EXYNOS4_CLKSRC_MASK_LCD0               , .val = 0x00001111, },
  45         { .reg = EXYNOS4_CLKSRC_MASK_MAUDIO             , .val = 0x00000001, },
  46         { .reg = EXYNOS4_CLKSRC_MASK_FSYS               , .val = 0x01011111, },
  47         { .reg = EXYNOS4_CLKSRC_MASK_PERIL0             , .val = 0x01111111, },
  48         { .reg = EXYNOS4_CLKSRC_MASK_PERIL1             , .val = 0x01110111, },
  49         { .reg = EXYNOS4_CLKSRC_MASK_DMC                , .val = 0x00010000, },
  50 };
  51
  52 static struct sleep_save exynos4210_set_clksrc[] = {
  53         { .reg = EXYNOS4210_CLKSRC_MASK_LCD1            , .val = 0x00001111, },
  54 };
  55
  56 static struct sleep_save exynos4_epll_save[] = {
  57         SAVE_ITEM(EXYNOS4_EPLL_CON0),
  58         SAVE_ITEM(EXYNOS4_EPLL_CON1),
  59 };
  60
  61 static struct sleep_save exynos4_vpll_save[] = {
  62         SAVE_ITEM(EXYNOS4_VPLL_CON0),
  63         SAVE_ITEM(EXYNOS4_VPLL_CON1),
  64 };
  65
  66 static struct sleep_save exynos4_core_save[] = {
  67         /* GIC side */
  68         SAVE_ITEM(S5P_VA_GIC_CPU + 0x000),
  69         SAVE_ITEM(S5P_VA_GIC_CPU + 0x004),
  70         SAVE_ITEM(S5P_VA_GIC_CPU + 0x008),
  71         SAVE_ITEM(S5P_VA_GIC_CPU + 0x00C),
  72         SAVE_ITEM(S5P_VA_GIC_CPU + 0x014),
  73         SAVE_ITEM(S5P_VA_GIC_CPU + 0x018),
  74         SAVE_ITEM(S5P_VA_GIC_DIST + 0x000),
  75         SAVE_ITEM(S5P_VA_GIC_DIST + 0x004),
  76         SAVE_ITEM(S5P_VA_GIC_DIST + 0x100),
  77         SAVE_ITEM(S5P_VA_GIC_DIST + 0x104),
  78         SAVE_ITEM(S5P_VA_GIC_DIST + 0x108),
  79         SAVE_ITEM(S5P_VA_GIC_DIST + 0x300),
  80         SAVE_ITEM(S5P_VA_GIC_DIST + 0x304),
  81         SAVE_ITEM(S5P_VA_GIC_DIST + 0x308),
  82         SAVE_ITEM(S5P_VA_GIC_DIST + 0x400),
  83         SAVE_ITEM(S5P_VA_GIC_DIST + 0x404),
  84         SAVE_ITEM(S5P_VA_GIC_DIST + 0x408),
  85         SAVE_ITEM(S5P_VA_GIC_DIST + 0x40C),
  86         SAVE_ITEM(S5P_VA_GIC_DIST + 0x410),
  87         SAVE_ITEM(S5P_VA_GIC_DIST + 0x414),
  88         SAVE_ITEM(S5P_VA_GIC_DIST + 0x418),
  89         SAVE_ITEM(S5P_VA_GIC_DIST + 0x41C),
  90         SAVE_ITEM(S5P_VA_GIC_DIST + 0x420),
  91         SAVE_ITEM(S5P_VA_GIC_DIST + 0x424),
  92         SAVE_ITEM(S5P_VA_GIC_DIST + 0x428),
  93         SAVE_ITEM(S5P_VA_GIC_DIST + 0x42C),
  94         SAVE_ITEM(S5P_VA_GIC_DIST + 0x430),
  95         SAVE_ITEM(S5P_VA_GIC_DIST + 0x434),
  96         SAVE_ITEM(S5P_VA_GIC_DIST + 0x438),
  97         SAVE_ITEM(S5P_VA_GIC_DIST + 0x43C),
  98         SAVE_ITEM(S5P_VA_GIC_DIST + 0x440),
  99         SAVE_ITEM(S5P_VA_GIC_DIST + 0x444),
 100         SAVE_ITEM(S5P_VA_GIC_DIST + 0x448),
 101         SAVE_ITEM(S5P_VA_GIC_DIST + 0x44C),
 102         SAVE_ITEM(S5P_VA_GIC_DIST + 0x450),
 103         SAVE_ITEM(S5P_VA_GIC_DIST + 0x454),
 104         SAVE_ITEM(S5P_VA_GIC_DIST + 0x458),
 105         SAVE_ITEM(S5P_VA_GIC_DIST + 0x45C),
 106
 107         SAVE_ITEM(S5P_VA_GIC_DIST + 0x800),
 108         SAVE_ITEM(S5P_VA_GIC_DIST + 0x804),
 109         SAVE_ITEM(S5P_VA_GIC_DIST + 0x808),
 110         SAVE_ITEM(S5P_VA_GIC_DIST + 0x80C),
 111         SAVE_ITEM(S5P_VA_GIC_DIST + 0x810),
 112         SAVE_ITEM(S5P_VA_GIC_DIST + 0x814),
 113         SAVE_ITEM(S5P_VA_GIC_DIST + 0x818),
 114         SAVE_ITEM(S5P_VA_GIC_DIST + 0x81C),
 115         SAVE_ITEM(S5P_VA_GIC_DIST + 0x820),
 116         SAVE_ITEM(S5P_VA_GIC_DIST + 0x824),
 117         SAVE_ITEM(S5P_VA_GIC_DIST + 0x828),
 118         SAVE_ITEM(S5P_VA_GIC_DIST + 0x82C),
 119         SAVE_ITEM(S5P_VA_GIC_DIST + 0x830),
 120         SAVE_ITEM(S5P_VA_GIC_DIST + 0x834),
 121         SAVE_ITEM(S5P_VA_GIC_DIST + 0x838),
 122         SAVE_ITEM(S5P_VA_GIC_DIST + 0x83C),
 123         SAVE_ITEM(S5P_VA_GIC_DIST + 0x840),
 124         SAVE_ITEM(S5P_VA_GIC_DIST + 0x844),
 125         SAVE_ITEM(S5P_VA_GIC_DIST + 0x848),
 126         SAVE_ITEM(S5P_VA_GIC_DIST + 0x84C),
 127         SAVE_ITEM(S5P_VA_GIC_DIST + 0x850),
 128         SAVE_ITEM(S5P_VA_GIC_DIST + 0x854),
 129         SAVE_ITEM(S5P_VA_GIC_DIST + 0x858),
 130         SAVE_ITEM(S5P_VA_GIC_DIST + 0x85C),
 131
 132         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC00),
 133         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC04),
 134         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC08),
 135         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC0C),
 136         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC10),
 137         SAVE_ITEM(S5P_VA_GIC_DIST + 0xC14),
 138
 139         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x000),
 140         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x010),
 141         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x020),
 142         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x030),
 143         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x040),
 144         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x050),
 145         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x060),
 146         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x070),
 147         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x080),
 148         SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x090),
 149
 150         /* SROM side */
 151         SAVE_ITEM(S5P_SROM_BW),
 152         SAVE_ITEM(S5P_SROM_BC0),
 153         SAVE_ITEM(S5P_SROM_BC1),
 154         SAVE_ITEM(S5P_SROM_BC2),
 155         SAVE_ITEM(S5P_SROM_BC3),
 156 };
 157
 158
 159 /* For Cortex-A9 Diagnostic and Power control register */
 160 static unsigned int save_arm_register[2];
 161
 162 static int exynos4_cpu_suspend(unsigned long arg)
 163 {
 164         outer_flush_all();
 165
 166         /* issue the standby signal into the pm unit. */
 167         cpu_do_idle();
 168
 169         /* we should never get past here */
 170         panic("sleep resumed to originator?");
 171 }
 172
 173 static void exynos4_pm_prepare(void)
 174 {
 175         u32 tmp;
 176
 177         s3c_pm_do_save(exynos4_core_save, ARRAY_SIZE(exynos4_core_save));
 178         s3c_pm_do_save(exynos4_epll_save, ARRAY_SIZE(exynos4_epll_save));
 179         s3c_pm_do_save(exynos4_vpll_save, ARRAY_SIZE(exynos4_vpll_save));
 180
 181         tmp = __raw_readl(S5P_INFORM1);
 182
 183         /* Set value of power down register for sleep mode */
 184
 185         exynos4_sys_powerdown_conf(SYS_SLEEP);
 186         __raw_writel(S5P_CHECK_SLEEP, S5P_INFORM1);
 187
 188         /* ensure at least INFORM0 has the resume address */
 189
 190         __raw_writel(virt_to_phys(s3c_cpu_resume), S5P_INFORM0);
 191
 192         /* Before enter central sequence mode, clock src register have to set */
 193
 194         s3c_pm_do_restore_core(exynos4_set_clksrc, ARRAY_SIZE(exynos4_set_clksrc));
 195
 196         if (soc_is_exynos4210())
 197                 s3c_pm_do_restore_core(exynos4210_set_clksrc, ARRAY_SIZE(exynos4210_set_clksrc));
 198
 199 }
 200
 201 static int exynos4_pm_add(struct device *dev, struct subsys_interface *sif)
 202 {
 203         pm_cpu_prep = exynos4_pm_prepare;
 204         pm_cpu_sleep = exynos4_cpu_suspend;
 205
 206         return 0;
 207 }
 208
 209 static unsigned long pll_base_rate;
 210
 211 static void exynos4_restore_pll(void)
 212 {
 213         unsigned long pll_con, locktime, lockcnt;
 214         unsigned long pll_in_rate;
 215         unsigned int p_div, epll_wait = 0, vpll_wait = 0;
 216
 217         if (pll_base_rate == 0)
 218                 return;
 219
 220         pll_in_rate = pll_base_rate;
 221
 222         /* EPLL */
 223         pll_con = exynos4_epll_save[0].val;
 224
 225         if (pll_con & (1 << 31)) {
 226                 pll_con &= (PLL46XX_PDIV_MASK << PLL46XX_PDIV_SHIFT);
 227                 p_div = (pll_con >> PLL46XX_PDIV_SHIFT);
 228
 229                 pll_in_rate /= 1000000;
 230
 231                 locktime = (3000 / pll_in_rate) * p_div;
 232                 lockcnt = locktime * 10000 / (10000 / pll_in_rate);
 233
 234                 __raw_writel(lockcnt, EXYNOS4_EPLL_LOCK);
 235
 236                 s3c_pm_do_restore_core(exynos4_epll_save,
 237                                         ARRAY_SIZE(exynos4_epll_save));
 238                 epll_wait = 1;
 239         }
 240
 241         pll_in_rate = pll_base_rate;
 242
 243         /* VPLL */
 244         pll_con = exynos4_vpll_save[0].val;
 245
 246         if (pll_con & (1 << 31)) {
 247                 pll_in_rate /= 1000000;
 248                 /* 750us */
 249                 locktime = 750;
 250                 lockcnt = locktime * 10000 / (10000 / pll_in_rate);
 251
 252                 __raw_writel(lockcnt, EXYNOS4_VPLL_LOCK);
 253
 254                 s3c_pm_do_restore_core(exynos4_vpll_save,
 255                                         ARRAY_SIZE(exynos4_vpll_save));
 256                 vpll_wait = 1;
 257         }
 258
 259         /* Wait PLL locking */
 260
 261         do {
 262                 if (epll_wait) {
 263                         pll_con = __raw_readl(EXYNOS4_EPLL_CON0);
 264                         if (pll_con & (1 << EXYNOS4_EPLLCON0_LOCKED_SHIFT))
 265                                 epll_wait = 0;
 266                 }
 267
 268                 if (vpll_wait) {
 269                         pll_con = __raw_readl(EXYNOS4_VPLL_CON0);
 270                         if (pll_con & (1 << EXYNOS4_VPLLCON0_LOCKED_SHIFT))
 271                                 vpll_wait = 0;
 272                 }
 273         } while (epll_wait || vpll_wait);
 274 }
 275
 276 static struct subsys_interface exynos4_pm_interface = {
 277         .name           = "exynos4_pm",
 278         .subsys         = &exynos_subsys,
 279         .add_dev        = exynos4_pm_add,
 280 };
 281
 282 static __init int exynos4_pm_drvinit(void)
 283 {
 284         struct clk *pll_base;
 285         unsigned int tmp;
 286
 287         s3c_pm_init();
 288
 289         /* All wakeup disable */
 290
 291         tmp = __raw_readl(S5P_WAKEUP_MASK);
 292         tmp |= ((0xFF << 8) | (0x1F << 1));
 293         __raw_writel(tmp, S5P_WAKEUP_MASK);
 294
 295         pll_base = clk_get(NULL, "xtal");
 296
 297         if (!IS_ERR(pll_base)) {
 298                 pll_base_rate = clk_get_rate(pll_base);
 299                 clk_put(pll_base);
 300         }
 301
 302         return subsys_interface_register(&exynos4_pm_interface);
 303 }
 304 arch_initcall(exynos4_pm_drvinit);
 305
 306 static int exynos4_pm_suspend(void)
 307 {
 308         unsigned long tmp;
 309
 310         /* Setting Central Sequence Register for power down mode */
 311
 312         tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
 313         tmp &= ~S5P_CENTRAL_LOWPWR_CFG;
 314         __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
 315
 316         if (soc_is_exynos4212() || soc_is_exynos4412()) {
 317                 tmp = __raw_readl(S5P_CENTRAL_SEQ_OPTION);
 318                 tmp &= ~(S5P_USE_STANDBYWFI_ISP_ARM |
 319                          S5P_USE_STANDBYWFE_ISP_ARM);
 320                 __raw_writel(tmp, S5P_CENTRAL_SEQ_OPTION);
 321         }
 322
 323         /* Save Power control register */
 324         asm ("mrc p15, 0, %0, c15, c0, 0"
 325              : "=r" (tmp) : : "cc");
 326         save_arm_register[0] = tmp;
 327
 328         /* Save Diagnostic register */
 329         asm ("mrc p15, 0, %0, c15, c0, 1"
 330              : "=r" (tmp) : : "cc");
 331         save_arm_register[1] = tmp;
 332
 333         return 0;
 334 }
 335
 336 static void exynos4_pm_resume(void)
 337 {
 338         unsigned long tmp;
 339
 340         /*
 341          * If PMU failed while entering sleep mode, WFI will be
 342          * ignored by PMU and then exiting cpu_do_idle().
 343          * S5P_CENTRAL_LOWPWR_CFG bit will not be set automatically
 344          * in this situation.
 345          */
 346         tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
 347         if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) {
 348                 tmp |= S5P_CENTRAL_LOWPWR_CFG;
 349                 __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
 350                 /* No need to perform below restore code */
 351                 goto early_wakeup;
 352         }
 353         /* Restore Power control register */
 354         tmp = save_arm_register[0];
 355         asm volatile ("mcr p15, 0, %0, c15, c0, 0"
 356                       : : "r" (tmp)
 357                       : "cc");
 358
 359         /* Restore Diagnostic register */
 360         tmp = save_arm_register[1];
 361         asm volatile ("mcr p15, 0, %0, c15, c0, 1"
 362                       : : "r" (tmp)
 363                       : "cc");
 364
 365         /* For release retention */
 366
 367         __raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION);
 368         __raw_writel((1 << 28), S5P_PAD_RET_GPIO_OPTION);
 369         __raw_writel((1 << 28), S5P_PAD_RET_UART_OPTION);
 370         __raw_writel((1 << 28), S5P_PAD_RET_MMCA_OPTION);
 371         __raw_writel((1 << 28), S5P_PAD_RET_MMCB_OPTION);
 372         __raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION);
 373         __raw_writel((1 << 28), S5P_PAD_RET_EBIB_OPTION);
 374
 375         s3c_pm_do_restore_core(exynos4_core_save, ARRAY_SIZE(exynos4_core_save));
 376
 377         exynos4_restore_pll();
 378
 379 #ifdef CONFIG_SMP
 380         scu_enable(S5P_VA_SCU);
 381 #endif
 382
 383 early_wakeup:
 384         return;
 385 }
 386
 387 static struct syscore_ops exynos4_pm_syscore_ops = {
 388         .suspend        = exynos4_pm_suspend,
 389         .resume         = exynos4_pm_resume,
 390 };
 391
 392 static __init int exynos4_pm_syscore_init(void)
 393 {
 394         register_syscore_ops(&exynos4_pm_syscore_ops);
 395         return 0;
 396 }
 397 arch_initcall(exynos4_pm_syscore_init);