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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // | |
3 | // Copyright 2008 Openmoko, Inc. | |
4 | // Copyright 2004-2008 Simtec Electronics | |
5 | // Ben Dooks <ben@simtec.co.uk> | |
6 | // http://armlinux.simtec.co.uk/ | |
7 | // | |
8 | // S3C common power management (suspend to ram) support. | |
6419711a BD |
9 | |
10 | #include <linux/init.h> | |
11 | #include <linux/suspend.h> | |
12 | #include <linux/errno.h> | |
2261e0e6 | 13 | #include <linux/delay.h> |
cd3fc1b9 | 14 | #include <linux/of.h> |
334a1c70 | 15 | #include <linux/serial_s3c.h> |
6419711a BD |
16 | #include <linux/io.h> |
17 | ||
2261e0e6 | 18 | #include <asm/cacheflush.h> |
2c74a0ce | 19 | #include <asm/suspend.h> |
2261e0e6 | 20 | |
d6280ffb | 21 | #include <mach/map.h> |
2857f650 | 22 | #include <mach/regs-clock.h> |
2261e0e6 | 23 | #include <mach/regs-irq.h> |
7ba8022f | 24 | #include <mach/irqs.h> |
d6280ffb | 25 | |
56b34426 | 26 | #include <asm/irq.h> |
2261e0e6 | 27 | |
6419711a | 28 | #include <plat/pm.h> |
431fb7df | 29 | #include <mach/pm-core.h> |
6419711a BD |
30 | |
31 | /* for external use */ | |
32 | ||
33 | unsigned long s3c_pm_flags; | |
34 | ||
56b34426 BD |
35 | /* The IRQ ext-int code goes here, it is too small to currently bother |
36 | * with its own file. */ | |
37 | ||
38 | unsigned long s3c_irqwake_intmask = 0xffffffffL; | |
39 | unsigned long s3c_irqwake_eintmask = 0xffffffffL; | |
40 | ||
f5aeffb7 | 41 | int s3c_irqext_wake(struct irq_data *data, unsigned int state) |
56b34426 | 42 | { |
f5aeffb7 | 43 | unsigned long bit = 1L << IRQ_EINT_BIT(data->irq); |
56b34426 BD |
44 | |
45 | if (!(s3c_irqwake_eintallow & bit)) | |
46 | return -ENOENT; | |
47 | ||
48 | printk(KERN_INFO "wake %s for irq %d\n", | |
f5aeffb7 | 49 | state ? "enabled" : "disabled", data->irq); |
56b34426 BD |
50 | |
51 | if (!state) | |
52 | s3c_irqwake_eintmask |= bit; | |
53 | else | |
54 | s3c_irqwake_eintmask &= ~bit; | |
55 | ||
56 | return 0; | |
57 | } | |
6419711a | 58 | |
2261e0e6 | 59 | void (*pm_cpu_prep)(void); |
29cb3cd2 | 60 | int (*pm_cpu_sleep)(unsigned long); |
2261e0e6 BD |
61 | |
62 | #define any_allowed(mask, allow) (((mask) & (allow)) != (allow)) | |
63 | ||
64 | /* s3c_pm_enter | |
65 | * | |
66 | * central control for sleep/resume process | |
67 | */ | |
68 | ||
69 | static int s3c_pm_enter(suspend_state_t state) | |
70 | { | |
d3fcacf5 | 71 | int ret; |
2261e0e6 BD |
72 | /* ensure the debug is initialised (if enabled) */ |
73 | ||
74 | s3c_pm_debug_init(); | |
75 | ||
76 | S3C_PMDBG("%s(%d)\n", __func__, state); | |
77 | ||
78 | if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) { | |
79 | printk(KERN_ERR "%s: error: no cpu sleep function\n", __func__); | |
80 | return -EINVAL; | |
81 | } | |
82 | ||
83 | /* check if we have anything to wake-up with... bad things seem | |
84 | * to happen if you suspend with no wakeup (system will often | |
85 | * require a full power-cycle) | |
86 | */ | |
87 | ||
cd3fc1b9 TF |
88 | if (!of_have_populated_dt() && |
89 | !any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) && | |
2261e0e6 BD |
90 | !any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) { |
91 | printk(KERN_ERR "%s: No wake-up sources!\n", __func__); | |
92 | printk(KERN_ERR "%s: Aborting sleep\n", __func__); | |
93 | return -EINVAL; | |
94 | } | |
95 | ||
2261e0e6 BD |
96 | /* save all necessary core registers not covered by the drivers */ |
97 | ||
cd3fc1b9 TF |
98 | if (!of_have_populated_dt()) { |
99 | samsung_pm_save_gpios(); | |
100 | samsung_pm_saved_gpios(); | |
101 | } | |
102 | ||
d2b07fe2 | 103 | s3c_pm_save_uarts(); |
2261e0e6 BD |
104 | s3c_pm_save_core(); |
105 | ||
106 | /* set the irq configuration for wake */ | |
107 | ||
108 | s3c_pm_configure_extint(); | |
109 | ||
110 | S3C_PMDBG("sleep: irq wakeup masks: %08lx,%08lx\n", | |
111 | s3c_irqwake_intmask, s3c_irqwake_eintmask); | |
112 | ||
113 | s3c_pm_arch_prepare_irqs(); | |
114 | ||
115 | /* call cpu specific preparation */ | |
116 | ||
117 | pm_cpu_prep(); | |
118 | ||
119 | /* flush cache back to ram */ | |
120 | ||
121 | flush_cache_all(); | |
122 | ||
123 | s3c_pm_check_store(); | |
124 | ||
125 | /* send the cpu to sleep... */ | |
126 | ||
127 | s3c_pm_arch_stop_clocks(); | |
128 | ||
e7089da9 | 129 | /* this will also act as our return point from when |
fff94cd9 BD |
130 | * we resume as it saves its own register state and restores it |
131 | * during the resume. */ | |
2261e0e6 | 132 | |
d3fcacf5 AK |
133 | ret = cpu_suspend(0, pm_cpu_sleep); |
134 | if (ret) | |
135 | return ret; | |
2261e0e6 | 136 | |
2261e0e6 BD |
137 | /* restore the system state */ |
138 | ||
139 | s3c_pm_restore_core(); | |
d2b07fe2 | 140 | s3c_pm_restore_uarts(); |
cd3fc1b9 TF |
141 | |
142 | if (!of_have_populated_dt()) { | |
143 | samsung_pm_restore_gpios(); | |
144 | s3c_pm_restored_gpios(); | |
145 | } | |
2261e0e6 BD |
146 | |
147 | s3c_pm_debug_init(); | |
148 | ||
149 | /* check what irq (if any) restored the system */ | |
150 | ||
151 | s3c_pm_arch_show_resume_irqs(); | |
152 | ||
153 | S3C_PMDBG("%s: post sleep, preparing to return\n", __func__); | |
154 | ||
bd117bd1 BD |
155 | /* LEDs should now be 1110 */ |
156 | s3c_pm_debug_smdkled(1 << 1, 0); | |
157 | ||
2261e0e6 BD |
158 | s3c_pm_check_restore(); |
159 | ||
160 | /* ok, let's return from sleep */ | |
161 | ||
162 | S3C_PMDBG("S3C PM Resume (post-restore)\n"); | |
163 | return 0; | |
164 | } | |
165 | ||
aa8aba69 BD |
166 | static int s3c_pm_prepare(void) |
167 | { | |
168 | /* prepare check area if configured */ | |
169 | ||
170 | s3c_pm_check_prepare(); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | static void s3c_pm_finish(void) | |
175 | { | |
176 | s3c_pm_check_cleanup(); | |
177 | } | |
178 | ||
2f55ac07 | 179 | static const struct platform_suspend_ops s3c_pm_ops = { |
2261e0e6 | 180 | .enter = s3c_pm_enter, |
aa8aba69 BD |
181 | .prepare = s3c_pm_prepare, |
182 | .finish = s3c_pm_finish, | |
2261e0e6 BD |
183 | .valid = suspend_valid_only_mem, |
184 | }; | |
185 | ||
4e59c25d | 186 | /* s3c_pm_init |
2261e0e6 BD |
187 | * |
188 | * Attach the power management functions. This should be called | |
189 | * from the board specific initialisation if the board supports | |
190 | * it. | |
191 | */ | |
192 | ||
4e59c25d | 193 | int __init s3c_pm_init(void) |
2261e0e6 BD |
194 | { |
195 | printk("S3C Power Management, Copyright 2004 Simtec Electronics\n"); | |
196 | ||
197 | suspend_set_ops(&s3c_pm_ops); | |
198 | return 0; | |
199 | } |