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authorRajendra Nayak <rnayak@ti.com>2010-08-02 13:18:18 +0300
committerTony Lindgren <tony@atomide.com>2010-08-02 13:18:18 +0300
commit5643aebbc088332e6722750c45bcd83f61af071e (patch)
tree2df11565efd2ccddea113df099019a21f1df5d66 /arch/arm/mach-omap2
parent0003450964357ec85eeeeda2e4bb8b06a6f82ad3 (diff)
omap4: suspend: Add basic system suspend support
This patch adds support for basic suspend doing a CPUx wfi for OMAP4. All powerdomains are for now are kept programmed in ON state. Signed-off-by: Rajendra Nayak <rnayak@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Cc: Kevin Hilman <khilman@deeprootsystems.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap2')
-rw-r--r--arch/arm/mach-omap2/Makefile1
-rw-r--r--arch/arm/mach-omap2/pm44xx.c135
2 files changed, 136 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 0efcc94fad2..3cb1b510ee4 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -49,6 +49,7 @@ ifeq ($(CONFIG_PM),y)
obj-$(CONFIG_ARCH_OMAP2) += pm24xx.o
obj-$(CONFIG_ARCH_OMAP2) += sleep24xx.o
obj-$(CONFIG_ARCH_OMAP3) += pm34xx.o sleep34xx.o cpuidle34xx.o
+obj-$(CONFIG_ARCH_OMAP4) += pm44xx.o
obj-$(CONFIG_PM_DEBUG) += pm-debug.o
AFLAGS_sleep24xx.o :=-Wa,-march=armv6
diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
new file mode 100644
index 00000000000..54544b4fc76
--- /dev/null
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -0,0 +1,135 @@
+/*
+ * OMAP4 Power Management Routines
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Rajendra Nayak <rnayak@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/pm.h>
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+#include <plat/powerdomain.h>
+#include <mach/omap4-common.h>
+
+struct power_state {
+ struct powerdomain *pwrdm;
+ u32 next_state;
+#ifdef CONFIG_SUSPEND
+ u32 saved_state;
+#endif
+ struct list_head node;
+};
+
+static LIST_HEAD(pwrst_list);
+
+#ifdef CONFIG_SUSPEND
+static int omap4_pm_prepare(void)
+{
+ disable_hlt();
+ return 0;
+}
+
+static int omap4_pm_suspend(void)
+{
+ do_wfi();
+ return 0;
+}
+
+static int omap4_pm_enter(suspend_state_t suspend_state)
+{
+ int ret = 0;
+
+ switch (suspend_state) {
+ case PM_SUSPEND_STANDBY:
+ case PM_SUSPEND_MEM:
+ ret = omap4_pm_suspend();
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static void omap4_pm_finish(void)
+{
+ enable_hlt();
+ return;
+}
+
+static int omap4_pm_begin(suspend_state_t state)
+{
+ return 0;
+}
+
+static void omap4_pm_end(void)
+{
+ return;
+}
+
+static struct platform_suspend_ops omap_pm_ops = {
+ .begin = omap4_pm_begin,
+ .end = omap4_pm_end,
+ .prepare = omap4_pm_prepare,
+ .enter = omap4_pm_enter,
+ .finish = omap4_pm_finish,
+ .valid = suspend_valid_only_mem,
+};
+#endif /* CONFIG_SUSPEND */
+
+static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
+{
+ struct power_state *pwrst;
+
+ if (!pwrdm->pwrsts)
+ return 0;
+
+ pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
+ if (!pwrst)
+ return -ENOMEM;
+ pwrst->pwrdm = pwrdm;
+ pwrst->next_state = PWRDM_POWER_ON;
+ list_add(&pwrst->node, &pwrst_list);
+
+ return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);
+}
+
+/**
+ * omap4_pm_init - Init routine for OMAP4 PM
+ *
+ * Initializes all powerdomain and clockdomain target states
+ * and all PRCM settings.
+ */
+static int __init omap4_pm_init(void)
+{
+ int ret;
+
+ if (!cpu_is_omap44xx())
+ return -ENODEV;
+
+ pr_err("Power Management for TI OMAP4.\n");
+
+#ifdef CONFIG_PM
+ ret = pwrdm_for_each(pwrdms_setup, NULL);
+ if (ret) {
+ pr_err("Failed to setup powerdomains\n");
+ goto err2;
+ }
+#endif
+
+#ifdef CONFIG_SUSPEND
+ suspend_set_ops(&omap_pm_ops);
+#endif /* CONFIG_SUSPEND */
+
+err2:
+ return ret;
+}
+late_initcall(omap4_pm_init);