Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
[sfrench/cifs-2.6.git] / 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/irqchip/arm-gic.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 #include <asm/suspend.h>
28
29 #include <plat/cpu.h>
30 #include <plat/pm-common.h>
31 #include <plat/pll.h>
32 #include <plat/regs-srom.h>
33
34 #include <mach/map.h>
35
36 #include "common.h"
37 #include "regs-pmu.h"
38
39 /**
40  * struct exynos_wkup_irq - Exynos GIC to PMU IRQ mapping
41  * @hwirq: Hardware IRQ signal of the GIC
42  * @mask: Mask in PMU wake-up mask register
43  */
44 struct exynos_wkup_irq {
45         unsigned int hwirq;
46         u32 mask;
47 };
48
49 static struct sleep_save exynos5_sys_save[] = {
50         SAVE_ITEM(EXYNOS5_SYS_I2C_CFG),
51 };
52
53 static struct sleep_save exynos_core_save[] = {
54         /* SROM side */
55         SAVE_ITEM(S5P_SROM_BW),
56         SAVE_ITEM(S5P_SROM_BC0),
57         SAVE_ITEM(S5P_SROM_BC1),
58         SAVE_ITEM(S5P_SROM_BC2),
59         SAVE_ITEM(S5P_SROM_BC3),
60 };
61
62 /*
63  * GIC wake-up support
64  */
65
66 static u32 exynos_irqwake_intmask = 0xffffffff;
67
68 static const struct exynos_wkup_irq exynos4_wkup_irq[] = {
69         { 76, BIT(1) }, /* RTC alarm */
70         { 77, BIT(2) }, /* RTC tick */
71         { /* sentinel */ },
72 };
73
74 static const struct exynos_wkup_irq exynos5250_wkup_irq[] = {
75         { 75, BIT(1) }, /* RTC alarm */
76         { 76, BIT(2) }, /* RTC tick */
77         { /* sentinel */ },
78 };
79
80 static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
81 {
82         const struct exynos_wkup_irq *wkup_irq;
83
84         if (soc_is_exynos5250())
85                 wkup_irq = exynos5250_wkup_irq;
86         else
87                 wkup_irq = exynos4_wkup_irq;
88
89         while (wkup_irq->mask) {
90                 if (wkup_irq->hwirq == data->hwirq) {
91                         if (!state)
92                                 exynos_irqwake_intmask |= wkup_irq->mask;
93                         else
94                                 exynos_irqwake_intmask &= ~wkup_irq->mask;
95                         return 0;
96                 }
97                 ++wkup_irq;
98         }
99
100         return -ENOENT;
101 }
102
103 /* For Cortex-A9 Diagnostic and Power control register */
104 static unsigned int save_arm_register[2];
105
106 static int exynos_cpu_suspend(unsigned long arg)
107 {
108 #ifdef CONFIG_CACHE_L2X0
109         outer_flush_all();
110 #endif
111
112         if (soc_is_exynos5250())
113                 flush_cache_all();
114
115         /* issue the standby signal into the pm unit. */
116         cpu_do_idle();
117
118         pr_info("Failed to suspend the system\n");
119         return 1; /* Aborting suspend */
120 }
121
122 static void exynos_pm_prepare(void)
123 {
124         unsigned int tmp;
125
126         /* Set wake-up mask registers */
127         __raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
128         __raw_writel(exynos_irqwake_intmask & ~(1 << 31), S5P_WAKEUP_MASK);
129
130         s3c_pm_do_save(exynos_core_save, ARRAY_SIZE(exynos_core_save));
131
132         if (soc_is_exynos5250()) {
133                 s3c_pm_do_save(exynos5_sys_save, ARRAY_SIZE(exynos5_sys_save));
134                 /* Disable USE_RETENTION of JPEG_MEM_OPTION */
135                 tmp = __raw_readl(EXYNOS5_JPEG_MEM_OPTION);
136                 tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
137                 __raw_writel(tmp, EXYNOS5_JPEG_MEM_OPTION);
138         }
139
140         /* Set value of power down register for sleep mode */
141
142         exynos_sys_powerdown_conf(SYS_SLEEP);
143         __raw_writel(S5P_CHECK_SLEEP, S5P_INFORM1);
144
145         /* ensure at least INFORM0 has the resume address */
146
147         __raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
148 }
149
150 static int exynos_pm_suspend(void)
151 {
152         unsigned long tmp;
153
154         /* Setting Central Sequence Register for power down mode */
155
156         tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
157         tmp &= ~S5P_CENTRAL_LOWPWR_CFG;
158         __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
159
160         /* Setting SEQ_OPTION register */
161
162         tmp = (S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0);
163         __raw_writel(tmp, S5P_CENTRAL_SEQ_OPTION);
164
165         if (!soc_is_exynos5250()) {
166                 /* Save Power control register */
167                 asm ("mrc p15, 0, %0, c15, c0, 0"
168                      : "=r" (tmp) : : "cc");
169                 save_arm_register[0] = tmp;
170
171                 /* Save Diagnostic register */
172                 asm ("mrc p15, 0, %0, c15, c0, 1"
173                      : "=r" (tmp) : : "cc");
174                 save_arm_register[1] = tmp;
175         }
176
177         return 0;
178 }
179
180 static void exynos_pm_resume(void)
181 {
182         unsigned long tmp;
183
184         /*
185          * If PMU failed while entering sleep mode, WFI will be
186          * ignored by PMU and then exiting cpu_do_idle().
187          * S5P_CENTRAL_LOWPWR_CFG bit will not be set automatically
188          * in this situation.
189          */
190         tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
191         if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) {
192                 tmp |= S5P_CENTRAL_LOWPWR_CFG;
193                 __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
194                 /* clear the wakeup state register */
195                 __raw_writel(0x0, S5P_WAKEUP_STAT);
196                 /* No need to perform below restore code */
197                 goto early_wakeup;
198         }
199         if (!soc_is_exynos5250()) {
200                 /* Restore Power control register */
201                 tmp = save_arm_register[0];
202                 asm volatile ("mcr p15, 0, %0, c15, c0, 0"
203                               : : "r" (tmp)
204                               : "cc");
205
206                 /* Restore Diagnostic register */
207                 tmp = save_arm_register[1];
208                 asm volatile ("mcr p15, 0, %0, c15, c0, 1"
209                               : : "r" (tmp)
210                               : "cc");
211         }
212
213         /* For release retention */
214
215         __raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION);
216         __raw_writel((1 << 28), S5P_PAD_RET_GPIO_OPTION);
217         __raw_writel((1 << 28), S5P_PAD_RET_UART_OPTION);
218         __raw_writel((1 << 28), S5P_PAD_RET_MMCA_OPTION);
219         __raw_writel((1 << 28), S5P_PAD_RET_MMCB_OPTION);
220         __raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION);
221         __raw_writel((1 << 28), S5P_PAD_RET_EBIB_OPTION);
222
223         if (soc_is_exynos5250())
224                 s3c_pm_do_restore(exynos5_sys_save,
225                         ARRAY_SIZE(exynos5_sys_save));
226
227         s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save));
228
229         if (IS_ENABLED(CONFIG_SMP) && !soc_is_exynos5250())
230                 scu_enable(S5P_VA_SCU);
231
232 early_wakeup:
233
234         /* Clear SLEEP mode set in INFORM1 */
235         __raw_writel(0x0, S5P_INFORM1);
236
237         return;
238 }
239
240 static struct syscore_ops exynos_pm_syscore_ops = {
241         .suspend        = exynos_pm_suspend,
242         .resume         = exynos_pm_resume,
243 };
244
245 /*
246  * Suspend Ops
247  */
248
249 static int exynos_suspend_enter(suspend_state_t state)
250 {
251         int ret;
252
253         s3c_pm_debug_init();
254
255         S3C_PMDBG("%s: suspending the system...\n", __func__);
256
257         S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
258                         exynos_irqwake_intmask, exynos_get_eint_wake_mask());
259
260         if (exynos_irqwake_intmask == -1U
261             && exynos_get_eint_wake_mask() == -1U) {
262                 pr_err("%s: No wake-up sources!\n", __func__);
263                 pr_err("%s: Aborting sleep\n", __func__);
264                 return -EINVAL;
265         }
266
267         s3c_pm_save_uarts();
268         exynos_pm_prepare();
269         flush_cache_all();
270         s3c_pm_check_store();
271
272         ret = cpu_suspend(0, exynos_cpu_suspend);
273         if (ret)
274                 return ret;
275
276         s3c_pm_restore_uarts();
277
278         S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
279                         __raw_readl(S5P_WAKEUP_STAT));
280
281         s3c_pm_check_restore();
282
283         S3C_PMDBG("%s: resuming the system...\n", __func__);
284
285         return 0;
286 }
287
288 static int exynos_suspend_prepare(void)
289 {
290         s3c_pm_check_prepare();
291
292         return 0;
293 }
294
295 static void exynos_suspend_finish(void)
296 {
297         s3c_pm_check_cleanup();
298 }
299
300 static const struct platform_suspend_ops exynos_suspend_ops = {
301         .enter          = exynos_suspend_enter,
302         .prepare        = exynos_suspend_prepare,
303         .finish         = exynos_suspend_finish,
304         .valid          = suspend_valid_only_mem,
305 };
306
307 void __init exynos_pm_init(void)
308 {
309         u32 tmp;
310
311         /* Platform-specific GIC callback */
312         gic_arch_extn.irq_set_wake = exynos_irq_set_wake;
313
314         /* All wakeup disable */
315         tmp = __raw_readl(S5P_WAKEUP_MASK);
316         tmp |= ((0xFF << 8) | (0x1F << 1));
317         __raw_writel(tmp, S5P_WAKEUP_MASK);
318
319         register_syscore_ops(&exynos_pm_syscore_ops);
320         suspend_set_ops(&exynos_suspend_ops);
321 }