Jongpill Lee | c934710 | 2012-02-17 09:49:54 +0900 | [diff] [blame] | 1 | /* |
Bartlomiej Zolnierkiewicz | 0d713cf | 2014-09-25 18:02:45 +0900 | [diff] [blame] | 2 | * Copyright (c) 2011-2014 Samsung Electronics Co., Ltd. |
Jaecheol Lee | 1663895 | 2011-03-10 13:33:59 +0900 | [diff] [blame] | 3 | * http://www.samsung.com |
| 4 | * |
Jongpill Lee | c934710 | 2012-02-17 09:49:54 +0900 | [diff] [blame] | 5 | * EXYNOS - Power Management support |
Jaecheol Lee | 1663895 | 2011-03-10 13:33:59 +0900 | [diff] [blame] | 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> |
Daniel Lezcano | 85f9f90 | 2014-05-09 06:43:27 +0900 | [diff] [blame] | 18 | #include <linux/cpu_pm.h> |
Jaecheol Lee | 1663895 | 2011-03-10 13:33:59 +0900 | [diff] [blame] | 19 | #include <linux/io.h> |
Jaecheol Lee | 56c03d9 | 2011-07-18 19:25:13 +0900 | [diff] [blame] | 20 | #include <linux/err.h> |
Jaecheol Lee | 1663895 | 2011-03-10 13:33:59 +0900 | [diff] [blame] | 21 | |
Tomasz Figa | 2b9d9c3 | 2014-09-24 01:24:39 +0900 | [diff] [blame] | 22 | #include <asm/firmware.h> |
Shawn Guo | 63b870f | 2011-11-17 01:19:11 +0900 | [diff] [blame] | 23 | #include <asm/smp_scu.h> |
Tomasz Figa | d710aa3 | 2014-03-18 07:28:27 +0900 | [diff] [blame] | 24 | #include <asm/suspend.h> |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 25 | #include <asm/cacheflush.h> |
Jaecheol Lee | 1663895 | 2011-03-10 13:33:59 +0900 | [diff] [blame] | 26 | |
Pankaj Dubey | 32b0aa9 | 2015-01-09 01:14:23 +0900 | [diff] [blame] | 27 | #include <mach/map.h> |
| 28 | |
Tomasz Figa | d710aa3 | 2014-03-18 07:28:27 +0900 | [diff] [blame] | 29 | #include <plat/pm-common.h> |
Kukjin Kim | ccd458c | 2012-12-31 10:06:48 -0800 | [diff] [blame] | 30 | |
| 31 | #include "common.h" |
Pankaj Dubey | 6b7bfd8 | 2014-11-07 09:26:47 +0900 | [diff] [blame] | 32 | #include "exynos-pmu.h" |
Kukjin Kim | 65c9a85 | 2013-12-19 04:06:56 +0900 | [diff] [blame] | 33 | #include "regs-pmu.h" |
Jaecheol Lee | 1663895 | 2011-03-10 13:33:59 +0900 | [diff] [blame] | 34 | |
Bartlomiej Zolnierkiewicz | 134abc2 | 2014-09-25 17:59:40 +0900 | [diff] [blame] | 35 | static inline void __iomem *exynos_boot_vector_addr(void) |
| 36 | { |
| 37 | if (samsung_rev() == EXYNOS4210_REV_1_1) |
| 38 | return pmu_base_addr + S5P_INFORM7; |
| 39 | else if (samsung_rev() == EXYNOS4210_REV_1_0) |
| 40 | return sysram_base_addr + 0x24; |
| 41 | return pmu_base_addr + S5P_INFORM0; |
| 42 | } |
| 43 | |
| 44 | static inline void __iomem *exynos_boot_vector_flag(void) |
| 45 | { |
| 46 | if (samsung_rev() == EXYNOS4210_REV_1_1) |
| 47 | return pmu_base_addr + S5P_INFORM6; |
| 48 | else if (samsung_rev() == EXYNOS4210_REV_1_0) |
| 49 | return sysram_base_addr + 0x20; |
| 50 | return pmu_base_addr + S5P_INFORM1; |
| 51 | } |
Daniel Lezcano | 3681baf | 2014-05-09 06:53:00 +0900 | [diff] [blame] | 52 | |
Daniel Lezcano | e30b154 | 2014-05-09 06:56:24 +0900 | [diff] [blame] | 53 | #define S5P_CHECK_AFTR 0xFCBA0D10 |
Daniel Lezcano | 3681baf | 2014-05-09 06:53:00 +0900 | [diff] [blame] | 54 | |
Jaecheol Lee | f4ba4b0 | 2011-07-18 19:25:03 +0900 | [diff] [blame] | 55 | /* For Cortex-A9 Diagnostic and Power control register */ |
| 56 | static unsigned int save_arm_register[2]; |
| 57 | |
Bartlomiej Zolnierkiewicz | 0d713cf | 2014-09-25 18:02:45 +0900 | [diff] [blame] | 58 | void exynos_cpu_save_register(void) |
Daniel Lezcano | 309e08c | 2014-05-09 06:43:27 +0900 | [diff] [blame] | 59 | { |
| 60 | unsigned long tmp; |
| 61 | |
| 62 | /* Save Power control register */ |
| 63 | asm ("mrc p15, 0, %0, c15, c0, 0" |
| 64 | : "=r" (tmp) : : "cc"); |
| 65 | |
| 66 | save_arm_register[0] = tmp; |
| 67 | |
| 68 | /* Save Diagnostic register */ |
| 69 | asm ("mrc p15, 0, %0, c15, c0, 1" |
| 70 | : "=r" (tmp) : : "cc"); |
| 71 | |
| 72 | save_arm_register[1] = tmp; |
| 73 | } |
| 74 | |
Bartlomiej Zolnierkiewicz | 0d713cf | 2014-09-25 18:02:45 +0900 | [diff] [blame] | 75 | void exynos_cpu_restore_register(void) |
Daniel Lezcano | 309e08c | 2014-05-09 06:43:27 +0900 | [diff] [blame] | 76 | { |
| 77 | unsigned long tmp; |
| 78 | |
| 79 | /* Restore Power control register */ |
| 80 | tmp = save_arm_register[0]; |
| 81 | |
| 82 | asm volatile ("mcr p15, 0, %0, c15, c0, 0" |
| 83 | : : "r" (tmp) |
| 84 | : "cc"); |
| 85 | |
| 86 | /* Restore Diagnostic register */ |
| 87 | tmp = save_arm_register[1]; |
| 88 | |
| 89 | asm volatile ("mcr p15, 0, %0, c15, c0, 1" |
| 90 | : : "r" (tmp) |
| 91 | : "cc"); |
| 92 | } |
| 93 | |
Bartlomiej Zolnierkiewicz | 0d713cf | 2014-09-25 18:02:45 +0900 | [diff] [blame] | 94 | void exynos_pm_central_suspend(void) |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 95 | { |
| 96 | unsigned long tmp; |
| 97 | |
| 98 | /* Setting Central Sequence Register for power down mode */ |
| 99 | tmp = pmu_raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION); |
| 100 | tmp &= ~S5P_CENTRAL_LOWPWR_CFG; |
| 101 | pmu_raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION); |
| 102 | } |
| 103 | |
Bartlomiej Zolnierkiewicz | 0d713cf | 2014-09-25 18:02:45 +0900 | [diff] [blame] | 104 | int exynos_pm_central_resume(void) |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 105 | { |
| 106 | unsigned long tmp; |
| 107 | |
| 108 | /* |
| 109 | * If PMU failed while entering sleep mode, WFI will be |
| 110 | * ignored by PMU and then exiting cpu_do_idle(). |
| 111 | * S5P_CENTRAL_LOWPWR_CFG bit will not be set automatically |
| 112 | * in this situation. |
| 113 | */ |
| 114 | tmp = pmu_raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION); |
| 115 | if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) { |
| 116 | tmp |= S5P_CENTRAL_LOWPWR_CFG; |
| 117 | pmu_raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION); |
| 118 | /* clear the wakeup state register */ |
| 119 | pmu_raw_writel(0x0, S5P_WAKEUP_STAT); |
| 120 | /* No need to perform below restore code */ |
| 121 | return -1; |
| 122 | } |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | /* Ext-GIC nIRQ/nFIQ is the only wakeup source in AFTR */ |
| 128 | static void exynos_set_wakeupmask(long mask) |
| 129 | { |
| 130 | pmu_raw_writel(mask, S5P_WAKEUP_MASK); |
Bartlomiej Zolnierkiewicz | 8936640 | 2015-03-27 02:35:48 +0900 | [diff] [blame] | 131 | if (soc_is_exynos3250()) |
| 132 | pmu_raw_writel(0x0, S5P_WAKEUP_MASK2); |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | static void exynos_cpu_set_boot_vector(long flags) |
| 136 | { |
Bartlomiej Zolnierkiewicz | 134abc2 | 2014-09-25 17:59:40 +0900 | [diff] [blame] | 137 | __raw_writel(virt_to_phys(exynos_cpu_resume), |
| 138 | exynos_boot_vector_addr()); |
| 139 | __raw_writel(flags, exynos_boot_vector_flag()); |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | static int exynos_aftr_finisher(unsigned long flags) |
| 143 | { |
Bartlomiej Zolnierkiewicz | a135e20 | 2014-09-25 17:59:41 +0900 | [diff] [blame] | 144 | int ret; |
| 145 | |
Bartlomiej Zolnierkiewicz | 8936640 | 2015-03-27 02:35:48 +0900 | [diff] [blame] | 146 | exynos_set_wakeupmask(soc_is_exynos3250() ? 0x40003ffe : 0x0000ff3e); |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 147 | /* Set value of power down register for aftr mode */ |
| 148 | exynos_sys_powerdown_conf(SYS_AFTR); |
Bartlomiej Zolnierkiewicz | a135e20 | 2014-09-25 17:59:41 +0900 | [diff] [blame] | 149 | |
| 150 | ret = call_firmware_op(do_idle, FW_DO_IDLE_AFTR); |
| 151 | if (ret == -ENOSYS) { |
| 152 | if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) |
| 153 | exynos_cpu_save_register(); |
| 154 | exynos_cpu_set_boot_vector(S5P_CHECK_AFTR); |
| 155 | cpu_do_idle(); |
| 156 | } |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 157 | |
| 158 | return 1; |
| 159 | } |
| 160 | |
| 161 | void exynos_enter_aftr(void) |
| 162 | { |
Bartlomiej Zolnierkiewicz | 8936640 | 2015-03-27 02:35:48 +0900 | [diff] [blame] | 163 | unsigned int cpuid = smp_processor_id(); |
| 164 | |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 165 | cpu_pm_enter(); |
| 166 | |
Bartlomiej Zolnierkiewicz | 8936640 | 2015-03-27 02:35:48 +0900 | [diff] [blame] | 167 | if (soc_is_exynos3250()) |
| 168 | exynos_set_boot_flag(cpuid, C2_STATE); |
| 169 | |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 170 | exynos_pm_central_suspend(); |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 171 | |
Bartlomiej Zolnierkiewicz | 865e8b7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 172 | if (of_machine_is_compatible("samsung,exynos4212") || |
| 173 | of_machine_is_compatible("samsung,exynos4412")) { |
| 174 | /* Setting SEQ_OPTION register */ |
| 175 | pmu_raw_writel(S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0, |
| 176 | S5P_CENTRAL_SEQ_OPTION); |
| 177 | } |
| 178 | |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 179 | cpu_suspend(0, exynos_aftr_finisher); |
| 180 | |
| 181 | if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) { |
| 182 | scu_enable(S5P_VA_SCU); |
Bartlomiej Zolnierkiewicz | a135e20 | 2014-09-25 17:59:41 +0900 | [diff] [blame] | 183 | if (call_firmware_op(resume) == -ENOSYS) |
| 184 | exynos_cpu_restore_register(); |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | exynos_pm_central_resume(); |
| 188 | |
Bartlomiej Zolnierkiewicz | 8936640 | 2015-03-27 02:35:48 +0900 | [diff] [blame] | 189 | if (soc_is_exynos3250()) |
| 190 | exynos_clear_boot_flag(cpuid, C2_STATE); |
| 191 | |
Tomasz Figa | 01601b3 | 2014-08-05 14:43:10 +0200 | [diff] [blame] | 192 | cpu_pm_exit(); |
| 193 | } |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 194 | |
Bartlomiej Zolnierkiewicz | cfdda35 | 2015-03-18 03:26:11 +0900 | [diff] [blame] | 195 | #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE) |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 196 | static atomic_t cpu1_wakeup = ATOMIC_INIT(0); |
| 197 | |
| 198 | static int exynos_cpu0_enter_aftr(void) |
| 199 | { |
| 200 | int ret = -1; |
| 201 | |
| 202 | /* |
| 203 | * If the other cpu is powered on, we have to power it off, because |
| 204 | * the AFTR state won't work otherwise |
| 205 | */ |
| 206 | if (cpu_online(1)) { |
| 207 | /* |
| 208 | * We reach a sync point with the coupled idle state, we know |
| 209 | * the other cpu will power down itself or will abort the |
| 210 | * sequence, let's wait for one of these to happen |
| 211 | */ |
| 212 | while (exynos_cpu_power_state(1)) { |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 213 | unsigned long boot_addr; |
| 214 | |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 215 | /* |
| 216 | * The other cpu may skip idle and boot back |
| 217 | * up again |
| 218 | */ |
| 219 | if (atomic_read(&cpu1_wakeup)) |
| 220 | goto abort; |
| 221 | |
| 222 | /* |
| 223 | * The other cpu may bounce through idle and |
| 224 | * boot back up again, getting stuck in the |
| 225 | * boot rom code |
| 226 | */ |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 227 | ret = exynos_get_boot_addr(1, &boot_addr); |
| 228 | if (ret) |
| 229 | goto fail; |
| 230 | ret = -1; |
| 231 | if (boot_addr == 0) |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 232 | goto abort; |
| 233 | |
| 234 | cpu_relax(); |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | exynos_enter_aftr(); |
| 239 | ret = 0; |
| 240 | |
| 241 | abort: |
| 242 | if (cpu_online(1)) { |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 243 | unsigned long boot_addr = virt_to_phys(exynos_cpu_resume); |
| 244 | |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 245 | /* |
| 246 | * Set the boot vector to something non-zero |
| 247 | */ |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 248 | ret = exynos_set_boot_addr(1, boot_addr); |
| 249 | if (ret) |
| 250 | goto fail; |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 251 | dsb(); |
| 252 | |
| 253 | /* |
| 254 | * Turn on cpu1 and wait for it to be on |
| 255 | */ |
| 256 | exynos_cpu_power_up(1); |
| 257 | while (exynos_cpu_power_state(1) != S5P_CORE_LOCAL_PWR_EN) |
| 258 | cpu_relax(); |
| 259 | |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 260 | if (soc_is_exynos3250()) { |
| 261 | while (!pmu_raw_readl(S5P_PMU_SPARE2) && |
| 262 | !atomic_read(&cpu1_wakeup)) |
| 263 | cpu_relax(); |
| 264 | |
| 265 | if (!atomic_read(&cpu1_wakeup)) |
| 266 | exynos_core_restart(1); |
| 267 | } |
| 268 | |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 269 | while (!atomic_read(&cpu1_wakeup)) { |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 270 | smp_rmb(); |
| 271 | |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 272 | /* |
| 273 | * Poke cpu1 out of the boot rom |
| 274 | */ |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 275 | |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 276 | ret = exynos_set_boot_addr(1, boot_addr); |
| 277 | if (ret) |
| 278 | goto fail; |
| 279 | |
| 280 | call_firmware_op(cpu_boot, 1); |
| 281 | |
| 282 | if (soc_is_exynos3250()) |
| 283 | dsb_sev(); |
| 284 | else |
| 285 | arch_send_wakeup_ipi_mask(cpumask_of(1)); |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 286 | } |
| 287 | } |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 288 | fail: |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 289 | return ret; |
| 290 | } |
| 291 | |
| 292 | static int exynos_wfi_finisher(unsigned long flags) |
| 293 | { |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 294 | if (soc_is_exynos3250()) |
| 295 | flush_cache_all(); |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 296 | cpu_do_idle(); |
| 297 | |
| 298 | return -1; |
| 299 | } |
| 300 | |
| 301 | static int exynos_cpu1_powerdown(void) |
| 302 | { |
| 303 | int ret = -1; |
| 304 | |
| 305 | /* |
| 306 | * Idle sequence for cpu1 |
| 307 | */ |
| 308 | if (cpu_pm_enter()) |
| 309 | goto cpu1_aborted; |
| 310 | |
| 311 | /* |
| 312 | * Turn off cpu 1 |
| 313 | */ |
| 314 | exynos_cpu_power_down(1); |
| 315 | |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 316 | if (soc_is_exynos3250()) |
| 317 | pmu_raw_writel(0, S5P_PMU_SPARE2); |
| 318 | |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 319 | ret = cpu_suspend(0, exynos_wfi_finisher); |
| 320 | |
| 321 | cpu_pm_exit(); |
| 322 | |
| 323 | cpu1_aborted: |
| 324 | dsb(); |
| 325 | /* |
| 326 | * Notify cpu 0 that cpu 1 is awake |
| 327 | */ |
| 328 | atomic_set(&cpu1_wakeup, 1); |
| 329 | |
| 330 | return ret; |
| 331 | } |
| 332 | |
| 333 | static void exynos_pre_enter_aftr(void) |
| 334 | { |
Bartlomiej Zolnierkiewicz | af99711 | 2015-03-18 14:09:57 +0100 | [diff] [blame] | 335 | unsigned long boot_addr = virt_to_phys(exynos_cpu_resume); |
| 336 | |
| 337 | (void)exynos_set_boot_addr(1, boot_addr); |
Bartlomiej Zolnierkiewicz | 712eddf7 | 2015-01-24 14:05:50 +0900 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | static void exynos_post_enter_aftr(void) |
| 341 | { |
| 342 | atomic_set(&cpu1_wakeup, 0); |
| 343 | } |
| 344 | |
| 345 | struct cpuidle_exynos_data cpuidle_coupled_exynos_data = { |
| 346 | .cpu0_enter_aftr = exynos_cpu0_enter_aftr, |
| 347 | .cpu1_powerdown = exynos_cpu1_powerdown, |
| 348 | .pre_enter_aftr = exynos_pre_enter_aftr, |
| 349 | .post_enter_aftr = exynos_post_enter_aftr, |
| 350 | }; |
Bartlomiej Zolnierkiewicz | cfdda35 | 2015-03-18 03:26:11 +0900 | [diff] [blame] | 351 | #endif /* CONFIG_SMP && CONFIG_ARM_EXYNOS_CPUIDLE */ |