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Linux/arch/arm/plat-samsung/pm.c

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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.
  9 
 10 #include <linux/init.h>
 11 #include <linux/suspend.h>
 12 #include <linux/errno.h>
 13 #include <linux/delay.h>
 14 #include <linux/of.h>
 15 #include <linux/serial_s3c.h>
 16 #include <linux/io.h>
 17 
 18 #include <asm/cacheflush.h>
 19 #include <asm/suspend.h>
 20 
 21 #include <mach/map.h>
 22 #include <mach/regs-clock.h>
 23 #include <mach/regs-irq.h>
 24 #include <mach/irqs.h>
 25 
 26 #include <asm/irq.h>
 27 
 28 #include <plat/pm.h>
 29 #include <mach/pm-core.h>
 30 
 31 /* for external use */
 32 
 33 unsigned long s3c_pm_flags;
 34 
 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 
 41 int s3c_irqext_wake(struct irq_data *data, unsigned int state)
 42 {
 43         unsigned long bit = 1L << IRQ_EINT_BIT(data->irq);
 44 
 45         if (!(s3c_irqwake_eintallow & bit))
 46                 return -ENOENT;
 47 
 48         printk(KERN_INFO "wake %s for irq %d\n",
 49                state ? "enabled" : "disabled", data->irq);
 50 
 51         if (!state)
 52                 s3c_irqwake_eintmask |= bit;
 53         else
 54                 s3c_irqwake_eintmask &= ~bit;
 55 
 56         return 0;
 57 }
 58 
 59 void (*pm_cpu_prep)(void);
 60 int (*pm_cpu_sleep)(unsigned long);
 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 {
 71         int ret;
 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 
 88         if (!of_have_populated_dt() &&
 89             !any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) &&
 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 
 96         /* save all necessary core registers not covered by the drivers */
 97 
 98         if (!of_have_populated_dt()) {
 99                 samsung_pm_save_gpios();
100                 samsung_pm_saved_gpios();
101         }
102 
103         s3c_pm_save_uarts();
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 
129         /* this will also act as our return point from when
130          * we resume as it saves its own register state and restores it
131          * during the resume.  */
132 
133         ret = cpu_suspend(0, pm_cpu_sleep);
134         if (ret)
135                 return ret;
136 
137         /* restore the system state */
138 
139         s3c_pm_restore_core();
140         s3c_pm_restore_uarts();
141 
142         if (!of_have_populated_dt()) {
143                 samsung_pm_restore_gpios();
144                 s3c_pm_restored_gpios();
145         }
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 
155         /* LEDs should now be 1110 */
156         s3c_pm_debug_smdkled(1 << 1, 0);
157 
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 
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 
179 static const struct platform_suspend_ops s3c_pm_ops = {
180         .enter          = s3c_pm_enter,
181         .prepare        = s3c_pm_prepare,
182         .finish         = s3c_pm_finish,
183         .valid          = suspend_valid_only_mem,
184 };
185 
186 /* s3c_pm_init
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 
193 int __init s3c_pm_init(void)
194 {
195         printk("S3C Power Management, Copyright 2004 Simtec Electronics\n");
196 
197         suspend_set_ops(&s3c_pm_ops);
198         return 0;
199 }
200 

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