1 files changed, 167 insertions, 0 deletions
diff --git a/arch/arm/mach-sa1100/pm.c b/arch/arm/mach-sa1100/pm.c
new file mode 100644
index 000000000000..379ea5e3950f
--- /dev/null
+++ b/arch/arm/mach-sa1100/pm.c
@@ -0,0 +1,167 @@
+/*
+ * SA1100 Power Management Routines
+ *
+ * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License.
+ *
+ * History:
+ *
+ * 2001-02-06:	Cliff Brake         Initial code
+ *
+ * 2001-02-25:	Sukjae Cho <sjcho@east.isi.edu> &
+ * 		Chester Kuo <chester@linux.org.tw>
+ * 			Save more value for the resume function! Support
+ * 			Bitsy/Assabet/Freebird board
+ *
+ * 2001-08-29:	Nicolas Pitre <nico@cam.org>
+ * 			Cleaned up, pushed platform dependent stuff
+ * 			in the platform specific files.
+ *
+ * 2002-05-27:	Nicolas Pitre	Killed sleep.h and the kmalloced save array.
+ * 				Storage is local on the stack now.
+ */
+#include <linux/init.h>
+#include <linux/suspend.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+
+#include <asm/hardware.h>
+#include <asm/memory.h>
+#include <asm/system.h>
+#include <asm/mach/time.h>
+
+extern void sa1100_cpu_suspend(void);
+extern void sa1100_cpu_resume(void);
+
+#define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x
+#define RESTORE(x)	x = sleep_save[SLEEP_SAVE_##x]
+
+/*
+ * List of global SA11x0 peripheral registers to preserve.
+ * More ones like CP and general purpose register values are preserved
+ * on the stack and then the stack pointer is stored last in sleep.S.
+ */
+enum {	SLEEP_SAVE_SP = 0,
+
+	SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
+	SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,
+
+	SLEEP_SAVE_Ser1SDCR0,
+
+	SLEEP_SAVE_SIZE
+};
+
+
+static int sa11x0_pm_enter(suspend_state_t state)
+{
+	unsigned long gpio, sleep_save[SLEEP_SAVE_SIZE];
+	struct timespec delta, rtc;
+
+	if (state != PM_SUSPEND_MEM)
+		return -EINVAL;
+
+	/* preserve current time */
+	rtc.tv_sec = RCNR;
+	rtc.tv_nsec = 0;
+	save_time_delta(&delta, &rtc);
+	gpio = GPLR;
+
+	/* save vital registers */
+	SAVE(GPDR);
+	SAVE(GAFR);
+
+	SAVE(PPDR);
+	SAVE(PPSR);
+	SAVE(PPAR);
+	SAVE(PSDR);
+
+	SAVE(Ser1SDCR0);
+
+	/* Clear previous reset status */
+	RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;
+
+	/* set resume return address */
+	PSPR = virt_to_phys(sa1100_cpu_resume);
+
+	/* go zzz */
+	sa1100_cpu_suspend();
+
+	/*
+	 * Ensure not to come back here if it wasn't intended
+	 */
+	PSPR = 0;
+
+	/*
+	 * Ensure interrupt sources are disabled; we will re-init
+	 * the interrupt subsystem via the device manager.
+	 */
+	ICLR = 0;
+	ICCR = 1;
+	ICMR = 0;
+
+	/* restore registers */
+	RESTORE(GPDR);
+	RESTORE(GAFR);
+
+	RESTORE(PPDR);
+	RESTORE(PPSR);
+	RESTORE(PPAR);
+	RESTORE(PSDR);
+
+	RESTORE(Ser1SDCR0);
+
+	GPSR = gpio;
+	GPCR = ~gpio;
+
+	/*
+	 * Clear the peripheral sleep-hold bit.
+	 */
+	PSSR = PSSR_PH;
+
+	/* restore current time */
+	rtc.tv_sec = RCNR;
+	restore_time_delta(&delta, &rtc);
+
+	return 0;
+}
+
+unsigned long sleep_phys_sp(void *sp)
+{
+	return virt_to_phys(sp);
+}
+
+/*
+ * Called after processes are frozen, but before we shut down devices.
+ */
+static int sa11x0_pm_prepare(suspend_state_t state)
+{
+	return 0;
+}
+
+/*
+ * Called after devices are re-setup, but before processes are thawed.
+ */
+static int sa11x0_pm_finish(suspend_state_t state)
+{
+	return 0;
+}
+
+/*
+ * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
+ */
+static struct pm_ops sa11x0_pm_ops = {
+	.pm_disk_mode	= PM_DISK_FIRMWARE,
+	.prepare	= sa11x0_pm_prepare,
+	.enter		= sa11x0_pm_enter,
+	.finish		= sa11x0_pm_finish,
+};
+
+static int __init sa11x0_pm_init(void)
+{
+	pm_set_ops(&sa11x0_pm_ops);
+	return 0;
+}
+
+late_initcall(sa11x0_pm_init);