1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright 2008 Openmoko, Inc.
4 // Copyright 2008 Simtec Electronics
5 // Ben Dooks <ben@simtec.co.uk>
6 // http://armlinux.simtec.co.uk/
7 //
8 // S3C64XX CPU PM support.
9
10 #include <linux/init.h>
11 #include <linux/suspend.h>
12 #include <linux/serial_core.h>
13 #include <linux/io.h>
14 #include <linux/gpio.h>
15 #include <linux/pm_domain.h>
16
17 #include "map.h"
18 #include "irqs.h"
19
20 #include "cpu.h"
21 #include "devs.h"
22 #include "pm.h"
23 #include "wakeup-mask.h"
24
25 #include "regs-gpio.h"
26 #include "regs-clock.h"
27 #include "gpio-samsung.h"
28
29 #include "regs-gpio-memport-s3c64xx.h"
30 #include "regs-modem-s3c64xx.h"
31 #include "regs-sys-s3c64xx.h"
32 #include "regs-syscon-power-s3c64xx.h"
33
34 struct s3c64xx_pm_domain {
35 char *const name;
36 u32 ena;
37 u32 pwr_stat;
38 struct generic_pm_domain pd;
39 };
40
41 static int s3c64xx_pd_off(struct generic_pm_domain *domain)
42 {
43 struct s3c64xx_pm_domain *pd;
44 u32 val;
45
46 pd = container_of(domain, struct s3c64xx_pm_domain, pd);
47
48 val = __raw_readl(S3C64XX_NORMAL_CFG);
49 val &= ~(pd->ena);
50 __raw_writel(val, S3C64XX_NORMAL_CFG);
51
52 return 0;
53 }
54
55 static int s3c64xx_pd_on(struct generic_pm_domain *domain)
56 {
57 struct s3c64xx_pm_domain *pd;
58 u32 val;
59 long retry = 1000000L;
60
61 pd = container_of(domain, struct s3c64xx_pm_domain, pd);
62
63 val = __raw_readl(S3C64XX_NORMAL_CFG);
64 val |= pd->ena;
65 __raw_writel(val, S3C64XX_NORMAL_CFG);
66
67 /* Not all domains provide power status readback */
68 if (pd->pwr_stat) {
69 do {
70 cpu_relax();
71 if (__raw_readl(S3C64XX_BLK_PWR_STAT) & pd->pwr_stat)
72 break;
73 } while (retry--);
74
75 if (!retry) {
76 pr_err("Failed to start domain %s\n", pd->name);
77 return -EBUSY;
78 }
79 }
80
81 return 0;
82 }
83
84 static struct s3c64xx_pm_domain s3c64xx_pm_irom = {
85 .name = "IROM",
86 .ena = S3C64XX_NORMALCFG_IROM_ON,
87 .pd = {
88 .power_off = s3c64xx_pd_off,
89 .power_on = s3c64xx_pd_on,
90 },
91 };
92
93 static struct s3c64xx_pm_domain s3c64xx_pm_etm = {
94 .name = "ETM",
95 .ena = S3C64XX_NORMALCFG_DOMAIN_ETM_ON,
96 .pwr_stat = S3C64XX_BLKPWRSTAT_ETM,
97 .pd = {
98 .power_off = s3c64xx_pd_off,
99 .power_on = s3c64xx_pd_on,
100 },
101 };
102
103 static struct s3c64xx_pm_domain s3c64xx_pm_s = {
104 .name = "S",
105 .ena = S3C64XX_NORMALCFG_DOMAIN_S_ON,
106 .pwr_stat = S3C64XX_BLKPWRSTAT_S,
107 .pd = {
108 .power_off = s3c64xx_pd_off,
109 .power_on = s3c64xx_pd_on,
110 },
111 };
112
113 static struct s3c64xx_pm_domain s3c64xx_pm_f = {
114 .name = "F",
115 .ena = S3C64XX_NORMALCFG_DOMAIN_F_ON,
116 .pwr_stat = S3C64XX_BLKPWRSTAT_F,
117 .pd = {
118 .power_off = s3c64xx_pd_off,
119 .power_on = s3c64xx_pd_on,
120 },
121 };
122
123 static struct s3c64xx_pm_domain s3c64xx_pm_p = {
124 .name = "P",
125 .ena = S3C64XX_NORMALCFG_DOMAIN_P_ON,
126 .pwr_stat = S3C64XX_BLKPWRSTAT_P,
127 .pd = {
128 .power_off = s3c64xx_pd_off,
129 .power_on = s3c64xx_pd_on,
130 },
131 };
132
133 static struct s3c64xx_pm_domain s3c64xx_pm_i = {
134 .name = "I",
135 .ena = S3C64XX_NORMALCFG_DOMAIN_I_ON,
136 .pwr_stat = S3C64XX_BLKPWRSTAT_I,
137 .pd = {
138 .power_off = s3c64xx_pd_off,
139 .power_on = s3c64xx_pd_on,
140 },
141 };
142
143 static struct s3c64xx_pm_domain s3c64xx_pm_g = {
144 .name = "G",
145 .ena = S3C64XX_NORMALCFG_DOMAIN_G_ON,
146 .pd = {
147 .power_off = s3c64xx_pd_off,
148 .power_on = s3c64xx_pd_on,
149 },
150 };
151
152 static struct s3c64xx_pm_domain s3c64xx_pm_v = {
153 .name = "V",
154 .ena = S3C64XX_NORMALCFG_DOMAIN_V_ON,
155 .pwr_stat = S3C64XX_BLKPWRSTAT_V,
156 .pd = {
157 .power_off = s3c64xx_pd_off,
158 .power_on = s3c64xx_pd_on,
159 },
160 };
161
162 static struct s3c64xx_pm_domain *s3c64xx_always_on_pm_domains[] = {
163 &s3c64xx_pm_irom,
164 };
165
166 static struct s3c64xx_pm_domain *s3c64xx_pm_domains[] = {
167 &s3c64xx_pm_etm,
168 &s3c64xx_pm_g,
169 &s3c64xx_pm_v,
170 &s3c64xx_pm_i,
171 &s3c64xx_pm_p,
172 &s3c64xx_pm_s,
173 &s3c64xx_pm_f,
174 };
175
176 #ifdef CONFIG_PM_SLEEP
177 static struct sleep_save core_save[] = {
178 SAVE_ITEM(S3C64XX_MEM0DRVCON),
179 SAVE_ITEM(S3C64XX_MEM1DRVCON),
180 };
181
182 static struct sleep_save misc_save[] = {
183 SAVE_ITEM(S3C64XX_AHB_CON0),
184 SAVE_ITEM(S3C64XX_AHB_CON1),
185 SAVE_ITEM(S3C64XX_AHB_CON2),
186
187 SAVE_ITEM(S3C64XX_SPCON),
188
189 SAVE_ITEM(S3C64XX_MEM0CONSTOP),
190 SAVE_ITEM(S3C64XX_MEM1CONSTOP),
191 SAVE_ITEM(S3C64XX_MEM0CONSLP0),
192 SAVE_ITEM(S3C64XX_MEM0CONSLP1),
193 SAVE_ITEM(S3C64XX_MEM1CONSLP),
194
195 SAVE_ITEM(S3C64XX_SDMA_SEL),
196 SAVE_ITEM(S3C64XX_MODEM_MIFPCON),
197
198 SAVE_ITEM(S3C64XX_NORMAL_CFG),
199 };
200
201 void s3c_pm_configure_extint(void)
202 {
203 __raw_writel(s3c_irqwake_eintmask, S3C64XX_EINT_MASK);
204 }
205
206 void s3c_pm_restore_core(void)
207 {
208 __raw_writel(0, S3C64XX_EINT_MASK);
209
210 s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
211 s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save));
212 }
213
214 void s3c_pm_save_core(void)
215 {
216 s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save));
217 s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
218 }
219 #endif
220
221 /* since both s3c6400 and s3c6410 share the same sleep pm calls, we
222 * put the per-cpu code in here until any new cpu comes along and changes
223 * this.
224 */
225
226 static int s3c64xx_cpu_suspend(unsigned long arg)
227 {
228 unsigned long tmp;
229
230 /* set our standby method to sleep */
231
232 tmp = __raw_readl(S3C64XX_PWR_CFG);
233 tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
234 tmp |= S3C64XX_PWRCFG_CFG_WFI_SLEEP;
235 __raw_writel(tmp, S3C64XX_PWR_CFG);
236
237 /* clear any old wakeup */
238
239 __raw_writel(__raw_readl(S3C64XX_WAKEUP_STAT),
240 S3C64XX_WAKEUP_STAT);
241
242 /* issue the standby signal into the pm unit. Note, we
243 * issue a write-buffer drain just in case */
244
245 tmp = 0;
246
247 asm("b 1f\n\t"
248 ".align 5\n\t"
249 "1:\n\t"
250 "mcr p15, 0, %0, c7, c10, 5\n\t"
251 "mcr p15, 0, %0, c7, c10, 4\n\t"
252 "mcr p15, 0, %0, c7, c0, 4" :: "r" (tmp));
253
254 /* we should never get past here */
255
256 pr_info("Failed to suspend the system\n");
257 return 1; /* Aborting suspend */
258 }
259
260 /* mapping of interrupts to parts of the wakeup mask */
261 static const struct samsung_wakeup_mask wake_irqs[] = {
262 { .irq = IRQ_RTC_ALARM, .bit = S3C64XX_PWRCFG_RTC_ALARM_DISABLE, },
263 { .irq = IRQ_RTC_TIC, .bit = S3C64XX_PWRCFG_RTC_TICK_DISABLE, },
264 { .irq = IRQ_PENDN, .bit = S3C64XX_PWRCFG_TS_DISABLE, },
265 { .irq = IRQ_HSMMC0, .bit = S3C64XX_PWRCFG_MMC0_DISABLE, },
266 { .irq = IRQ_HSMMC1, .bit = S3C64XX_PWRCFG_MMC1_DISABLE, },
267 { .irq = IRQ_HSMMC2, .bit = S3C64XX_PWRCFG_MMC2_DISABLE, },
268 { .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_BATF_DISABLE},
269 { .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_MSM_DISABLE },
270 { .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_HSI_DISABLE },
271 { .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_MSM_DISABLE },
272 };
273
274 static void s3c64xx_pm_prepare(void)
275 {
276 samsung_sync_wakemask(S3C64XX_PWR_CFG,
277 wake_irqs, ARRAY_SIZE(wake_irqs));
278
279 /* store address of resume. */
280 __raw_writel(__pa_symbol(s3c_cpu_resume), S3C64XX_INFORM0);
281
282 /* ensure previous wakeup state is cleared before sleeping */
283 __raw_writel(__raw_readl(S3C64XX_WAKEUP_STAT), S3C64XX_WAKEUP_STAT);
284 }
285
286 int __init s3c64xx_pm_init(void)
287 {
288 int i;
289
290 s3c_pm_init();
291
292 for (i = 0; i < ARRAY_SIZE(s3c64xx_always_on_pm_domains); i++)
293 pm_genpd_init(&s3c64xx_always_on_pm_domains[i]->pd,
294 &pm_domain_always_on_gov, false);
295
296 for (i = 0; i < ARRAY_SIZE(s3c64xx_pm_domains); i++)
297 pm_genpd_init(&s3c64xx_pm_domains[i]->pd, NULL, false);
298
299 #ifdef CONFIG_S3C_DEV_FB
300 if (dev_get_platdata(&s3c_device_fb.dev))
301 pm_genpd_add_device(&s3c64xx_pm_f.pd, &s3c_device_fb.dev);
302 #endif
303
304 return 0;
305 }
306
307 static __init int s3c64xx_pm_initcall(void)
308 {
309 if (!soc_is_s3c64xx())
310 return 0;
311
312 pm_cpu_prep = s3c64xx_pm_prepare;
313 pm_cpu_sleep = s3c64xx_cpu_suspend;
314
315 return 0;
316 }
317 arch_initcall(s3c64xx_pm_initcall);
318
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.