#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/serial_core.h>
#include <linux/io.h>
+#include <asm/cacheflush.h>
+#include <mach/hardware.h>
+
+#include <plat/regs-serial.h>
+#include <mach/regs-clock.h>
+#include <mach/regs-gpio.h>
+#include <mach/regs-mem.h>
+#include <mach/regs-irq.h>
+
#include <plat/pm.h>
+#include <plat/pm-core.h>
/* for external use */
unsigned long s3c_pm_flags;
+/* Debug code:
+ *
+ * This code supports debug output to the low level UARTs for use on
+ * resume before the console layer is available.
+*/
+
#ifdef CONFIG_S3C2410_PM_DEBUG
extern void printascii(const char *);
printascii(buff);
}
+
+static inline void s3c_pm_debug_init(void)
+{
+ /* restart uart clocks so we can use them to output */
+ s3c_pm_debug_init_uart();
+}
+
+#else
+#define s3c_pm_debug_init() do { } while(0)
+
#endif /* CONFIG_S3C2410_PM_DEBUG */
+/* Save the UART configurations if we are configured for debug. */
+
+#ifdef CONFIG_S3C2410_PM_DEBUG
+
+#define SAVE_UART(va) \
+ SAVE_ITEM((va) + S3C2410_ULCON), \
+ SAVE_ITEM((va) + S3C2410_UCON), \
+ SAVE_ITEM((va) + S3C2410_UFCON), \
+ SAVE_ITEM((va) + S3C2410_UMCON), \
+ SAVE_ITEM((va) + S3C2410_UBRDIV)
+
+static struct sleep_save uart_save[] = {
+ SAVE_UART(S3C_VA_UART0),
+ SAVE_UART(S3C_VA_UART1),
+#ifndef CONFIG_CPU_S3C2400
+ SAVE_UART(S3C_VA_UART2),
+#endif
+};
+
+static void s3c_pm_save_uart(void)
+{
+ s3c_pm_do_save(uart_save, ARRAY_SIZE(uart_save));
+}
+
+static void s3c_pm_restore_uart(void)
+{
+ s3c_pm_do_restore(uart_save, ARRAY_SIZE(uart_save));
+}
+#else
+static void s3c_pm_save_uart(void) { }
+static void s3c_pm_restore_uart(void) { }
+#endif
+
/* helper functions to save and restore register state */
for (; count > 0; count--, ptr++)
__raw_writel(ptr->val, ptr->reg);
}
+
+/* s3c2410_pm_show_resume_irqs
+ *
+ * print any IRQs asserted at resume time (ie, we woke from)
+*/
+static void s3c_pm_show_resume_irqs(int start, unsigned long which,
+ unsigned long mask)
+{
+ int i;
+
+ which &= ~mask;
+
+ for (i = 0; i <= 31; i++) {
+ if (which & (1L<<i)) {
+ S3C_PMDBG("IRQ %d asserted at resume\n", start+i);
+ }
+ }
+}
+
+
+void (*pm_cpu_prep)(void);
+void (*pm_cpu_sleep)(void);
+
+#define any_allowed(mask, allow) (((mask) & (allow)) != (allow))
+
+/* s3c_pm_enter
+ *
+ * central control for sleep/resume process
+*/
+
+static int s3c_pm_enter(suspend_state_t state)
+{
+ unsigned long regs_save[16];
+
+ /* ensure the debug is initialised (if enabled) */
+
+ s3c_pm_debug_init();
+
+ S3C_PMDBG("%s(%d)\n", __func__, state);
+
+ if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) {
+ printk(KERN_ERR "%s: error: no cpu sleep function\n", __func__);
+ return -EINVAL;
+ }
+
+ /* check if we have anything to wake-up with... bad things seem
+ * to happen if you suspend with no wakeup (system will often
+ * require a full power-cycle)
+ */
+
+ if (!any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) &&
+ !any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) {
+ printk(KERN_ERR "%s: No wake-up sources!\n", __func__);
+ printk(KERN_ERR "%s: Aborting sleep\n", __func__);
+ return -EINVAL;
+ }
+
+ /* prepare check area if configured */
+
+ s3c_pm_check_prepare();
+
+ /* store the physical address of the register recovery block */
+
+ s3c_sleep_save_phys = virt_to_phys(regs_save);
+
+ S3C_PMDBG("s3c_sleep_save_phys=0x%08lx\n", s3c_sleep_save_phys);
+
+ /* save all necessary core registers not covered by the drivers */
+
+ s3c_pm_save_gpios();
+ s3c_pm_save_uart();
+ s3c_pm_save_core();
+
+ /* set the irq configuration for wake */
+
+ s3c_pm_configure_extint();
+
+ S3C_PMDBG("sleep: irq wakeup masks: %08lx,%08lx\n",
+ s3c_irqwake_intmask, s3c_irqwake_eintmask);
+
+ s3c_pm_arch_prepare_irqs();
+
+ /* call cpu specific preparation */
+
+ pm_cpu_prep();
+
+ /* flush cache back to ram */
+
+ flush_cache_all();
+
+ s3c_pm_check_store();
+
+ /* send the cpu to sleep... */
+
+ s3c_pm_arch_stop_clocks();
+
+ /* s3c2410_cpu_save will also act as our return point from when
+ * we resume as it saves its own register state, so use the return
+ * code to differentiate return from save and return from sleep */
+
+ if (s3c2410_cpu_save(regs_save) == 0) {
+ flush_cache_all();
+ pm_cpu_sleep();
+ }
+
+ /* restore the cpu state using the kernel's cpu init code. */
+
+ cpu_init();
+
+ /* restore the system state */
+
+ s3c_pm_restore_core();
+ s3c_pm_restore_uart();
+ s3c_pm_restore_gpios();
+
+ s3c_pm_debug_init();
+
+ /* check what irq (if any) restored the system */
+
+ s3c_pm_arch_show_resume_irqs();
+
+ S3C_PMDBG("%s: post sleep, preparing to return\n", __func__);
+
+ s3c_pm_check_restore();
+
+ /* ok, let's return from sleep */
+
+ S3C_PMDBG("S3C PM Resume (post-restore)\n");
+ return 0;
+}
+
+static struct platform_suspend_ops s3c_pm_ops = {
+ .enter = s3c_pm_enter,
+ .valid = suspend_valid_only_mem,
+};
+
+/* s3c2410_pm_init
+ *
+ * Attach the power management functions. This should be called
+ * from the board specific initialisation if the board supports
+ * it.
+*/
+
+int __init s3c2410_pm_init(void)
+{
+ printk("S3C Power Management, Copyright 2004 Simtec Electronics\n");
+
+ suspend_set_ops(&s3c_pm_ops);
+ return 0;
+}
projects / firefly-linux-kernel-4.4.55.git / blobdiff