2 * Copyright (c) 2011-2012 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com
5 * EXYNOS - Power Management support
7 * Based on arch/arm/mach-s3c2410/pm.c
8 * Copyright (c) 2006 Simtec Electronics
9 * Ben Dooks <ben@simtec.co.uk>
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.
16 #include <linux/init.h>
17 #include <linux/suspend.h>
18 #include <linux/syscore_ops.h>
20 #include <linux/err.h>
21 #include <linux/clk.h>
23 #include <asm/cacheflush.h>
24 #include <asm/hardware/cache-l2x0.h>
25 #include <asm/smp_scu.h>
30 #include <plat/regs-srom.h>
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>
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, },
52 static struct sleep_save exynos4210_set_clksrc
[] = {
53 { .reg
= EXYNOS4210_CLKSRC_MASK_LCD1
, .val
= 0x00001111, },
56 static struct sleep_save exynos4_epll_save
[] = {
57 SAVE_ITEM(EXYNOS4_EPLL_CON0
),
58 SAVE_ITEM(EXYNOS4_EPLL_CON1
),
61 static struct sleep_save exynos4_vpll_save
[] = {
62 SAVE_ITEM(EXYNOS4_VPLL_CON0
),
63 SAVE_ITEM(EXYNOS4_VPLL_CON1
),
66 static struct sleep_save exynos5_sys_save
[] = {
67 SAVE_ITEM(EXYNOS5_SYS_I2C_CFG
),
70 static struct sleep_save exynos_core_save
[] = {
72 SAVE_ITEM(S5P_SROM_BW
),
73 SAVE_ITEM(S5P_SROM_BC0
),
74 SAVE_ITEM(S5P_SROM_BC1
),
75 SAVE_ITEM(S5P_SROM_BC2
),
76 SAVE_ITEM(S5P_SROM_BC3
),
80 /* For Cortex-A9 Diagnostic and Power control register */
81 static unsigned int save_arm_register
[2];
83 static int exynos_cpu_suspend(unsigned long arg
)
85 #ifdef CONFIG_CACHE_L2X0
89 if (soc_is_exynos5250())
92 /* issue the standby signal into the pm unit. */
95 pr_info("Failed to suspend the system\n");
96 return 1; /* Aborting suspend */
99 static void exynos_pm_prepare(void)
103 s3c_pm_do_save(exynos_core_save
, ARRAY_SIZE(exynos_core_save
));
105 if (!soc_is_exynos5250()) {
106 s3c_pm_do_save(exynos4_epll_save
, ARRAY_SIZE(exynos4_epll_save
));
107 s3c_pm_do_save(exynos4_vpll_save
, ARRAY_SIZE(exynos4_vpll_save
));
109 s3c_pm_do_save(exynos5_sys_save
, ARRAY_SIZE(exynos5_sys_save
));
110 /* Disable USE_RETENTION of JPEG_MEM_OPTION */
111 tmp
= __raw_readl(EXYNOS5_JPEG_MEM_OPTION
);
112 tmp
&= ~EXYNOS5_OPTION_USE_RETENTION
;
113 __raw_writel(tmp
, EXYNOS5_JPEG_MEM_OPTION
);
116 /* Set value of power down register for sleep mode */
118 exynos_sys_powerdown_conf(SYS_SLEEP
);
119 __raw_writel(S5P_CHECK_SLEEP
, S5P_INFORM1
);
121 /* ensure at least INFORM0 has the resume address */
123 __raw_writel(virt_to_phys(s3c_cpu_resume
), S5P_INFORM0
);
125 /* Before enter central sequence mode, clock src register have to set */
127 if (!soc_is_exynos5250())
128 s3c_pm_do_restore_core(exynos4_set_clksrc
, ARRAY_SIZE(exynos4_set_clksrc
));
130 if (soc_is_exynos4210())
131 s3c_pm_do_restore_core(exynos4210_set_clksrc
, ARRAY_SIZE(exynos4210_set_clksrc
));
135 static int exynos_pm_add(struct device
*dev
, struct subsys_interface
*sif
)
137 pm_cpu_prep
= exynos_pm_prepare
;
138 pm_cpu_sleep
= exynos_cpu_suspend
;
143 static unsigned long pll_base_rate
;
145 static void exynos4_restore_pll(void)
147 unsigned long pll_con
, locktime
, lockcnt
;
148 unsigned long pll_in_rate
;
149 unsigned int p_div
, epll_wait
= 0, vpll_wait
= 0;
151 if (pll_base_rate
== 0)
154 pll_in_rate
= pll_base_rate
;
157 pll_con
= exynos4_epll_save
[0].val
;
159 if (pll_con
& (1 << 31)) {
160 pll_con
&= (PLL46XX_PDIV_MASK
<< PLL46XX_PDIV_SHIFT
);
161 p_div
= (pll_con
>> PLL46XX_PDIV_SHIFT
);
163 pll_in_rate
/= 1000000;
165 locktime
= (3000 / pll_in_rate
) * p_div
;
166 lockcnt
= locktime
* 10000 / (10000 / pll_in_rate
);
168 __raw_writel(lockcnt
, EXYNOS4_EPLL_LOCK
);
170 s3c_pm_do_restore_core(exynos4_epll_save
,
171 ARRAY_SIZE(exynos4_epll_save
));
175 pll_in_rate
= pll_base_rate
;
178 pll_con
= exynos4_vpll_save
[0].val
;
180 if (pll_con
& (1 << 31)) {
181 pll_in_rate
/= 1000000;
184 lockcnt
= locktime
* 10000 / (10000 / pll_in_rate
);
186 __raw_writel(lockcnt
, EXYNOS4_VPLL_LOCK
);
188 s3c_pm_do_restore_core(exynos4_vpll_save
,
189 ARRAY_SIZE(exynos4_vpll_save
));
193 /* Wait PLL locking */
197 pll_con
= __raw_readl(EXYNOS4_EPLL_CON0
);
198 if (pll_con
& (1 << EXYNOS4_EPLLCON0_LOCKED_SHIFT
))
203 pll_con
= __raw_readl(EXYNOS4_VPLL_CON0
);
204 if (pll_con
& (1 << EXYNOS4_VPLLCON0_LOCKED_SHIFT
))
207 } while (epll_wait
|| vpll_wait
);
210 static struct subsys_interface exynos_pm_interface
= {
212 .subsys
= &exynos_subsys
,
213 .add_dev
= exynos_pm_add
,
216 static __init
int exynos_pm_drvinit(void)
218 struct clk
*pll_base
;
223 /* All wakeup disable */
225 tmp
= __raw_readl(S5P_WAKEUP_MASK
);
226 tmp
|= ((0xFF << 8) | (0x1F << 1));
227 __raw_writel(tmp
, S5P_WAKEUP_MASK
);
229 if (!soc_is_exynos5250()) {
230 pll_base
= clk_get(NULL
, "xtal");
232 if (!IS_ERR(pll_base
)) {
233 pll_base_rate
= clk_get_rate(pll_base
);
238 return subsys_interface_register(&exynos_pm_interface
);
240 arch_initcall(exynos_pm_drvinit
);
242 static int exynos_pm_suspend(void)
246 /* Setting Central Sequence Register for power down mode */
248 tmp
= __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION
);
249 tmp
&= ~S5P_CENTRAL_LOWPWR_CFG
;
250 __raw_writel(tmp
, S5P_CENTRAL_SEQ_CONFIGURATION
);
252 /* Setting SEQ_OPTION register */
254 tmp
= (S5P_USE_STANDBY_WFI0
| S5P_USE_STANDBY_WFE0
);
255 __raw_writel(tmp
, S5P_CENTRAL_SEQ_OPTION
);
257 if (!soc_is_exynos5250()) {
258 /* Save Power control register */
259 asm ("mrc p15, 0, %0, c15, c0, 0"
260 : "=r" (tmp
) : : "cc");
261 save_arm_register
[0] = tmp
;
263 /* Save Diagnostic register */
264 asm ("mrc p15, 0, %0, c15, c0, 1"
265 : "=r" (tmp
) : : "cc");
266 save_arm_register
[1] = tmp
;
272 static void exynos_pm_resume(void)
277 * If PMU failed while entering sleep mode, WFI will be
278 * ignored by PMU and then exiting cpu_do_idle().
279 * S5P_CENTRAL_LOWPWR_CFG bit will not be set automatically
282 tmp
= __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION
);
283 if (!(tmp
& S5P_CENTRAL_LOWPWR_CFG
)) {
284 tmp
|= S5P_CENTRAL_LOWPWR_CFG
;
285 __raw_writel(tmp
, S5P_CENTRAL_SEQ_CONFIGURATION
);
286 /* clear the wakeup state register */
287 __raw_writel(0x0, S5P_WAKEUP_STAT
);
288 /* No need to perform below restore code */
291 if (!soc_is_exynos5250()) {
292 /* Restore Power control register */
293 tmp
= save_arm_register
[0];
294 asm volatile ("mcr p15, 0, %0, c15, c0, 0"
298 /* Restore Diagnostic register */
299 tmp
= save_arm_register
[1];
300 asm volatile ("mcr p15, 0, %0, c15, c0, 1"
305 /* For release retention */
307 __raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION
);
308 __raw_writel((1 << 28), S5P_PAD_RET_GPIO_OPTION
);
309 __raw_writel((1 << 28), S5P_PAD_RET_UART_OPTION
);
310 __raw_writel((1 << 28), S5P_PAD_RET_MMCA_OPTION
);
311 __raw_writel((1 << 28), S5P_PAD_RET_MMCB_OPTION
);
312 __raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION
);
313 __raw_writel((1 << 28), S5P_PAD_RET_EBIB_OPTION
);
315 if (soc_is_exynos5250())
316 s3c_pm_do_restore(exynos5_sys_save
,
317 ARRAY_SIZE(exynos5_sys_save
));
319 s3c_pm_do_restore_core(exynos_core_save
, ARRAY_SIZE(exynos_core_save
));
321 if (!soc_is_exynos5250()) {
322 exynos4_restore_pll();
325 scu_enable(S5P_VA_SCU
);
331 /* Clear SLEEP mode set in INFORM1 */
332 __raw_writel(0x0, S5P_INFORM1
);
337 static struct syscore_ops exynos_pm_syscore_ops
= {
338 .suspend
= exynos_pm_suspend
,
339 .resume
= exynos_pm_resume
,
342 static __init
int exynos_pm_syscore_init(void)
344 register_syscore_ops(&exynos_pm_syscore_ops
);
347 arch_initcall(exynos_pm_syscore_init
);