ARM / shmobile: Support for I/O power domains for SH7372 (v9)

Use the generic power domains support introduced by the previous
patch to implement support for power domains on SH7372.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 102 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/pm-sh7372.c b/arch/arm/mach-shmobile/pm-sh7372.c
index 8e4aadf14c9..e17f12424ec 100644
--- a/arch/arm/mach-shmobile/pm-sh7372.c
+++ b/arch/arm/mach-shmobile/pm-sh7372.c
@@ -15,16 +15,118 @@
 #include <linux/list.h>
 #include <linux/err.h>
 #include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
 #include <asm/system.h>
 #include <asm/io.h>
 #include <asm/tlbflush.h>
 #include <mach/common.h>
+#include <mach/sh7372.h>
 
 #define SMFRAM 0xe6a70000
 #define SYSTBCR 0xe6150024
 #define SBAR 0xe6180020
 #define APARMBAREA 0xe6f10020
 
+#define SPDCR 0xe6180008
+#define SWUCR 0xe6180014
+#define PSTR 0xe6180080
+
+#define PSTR_RETRIES 100
+#define PSTR_DELAY_US 10
+
+#ifdef CONFIG_PM
+
+static int pd_power_down(struct generic_pm_domain *genpd)
+{
+	struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd);
+	unsigned int mask = 1 << sh7372_pd->bit_shift;
+
+	if (__raw_readl(PSTR) & mask) {
+		unsigned int retry_count;
+
+		__raw_writel(mask, SPDCR);
+
+		for (retry_count = PSTR_RETRIES; retry_count; retry_count--) {
+			if (!(__raw_readl(SPDCR) & mask))
+				break;
+			cpu_relax();
+		}
+	}
+
+	pr_debug("sh7372 power domain down 0x%08x -> PSTR = 0x%08x\n",
+		 mask, __raw_readl(PSTR));
+
+	return 0;
+}
+
+static int pd_power_up(struct generic_pm_domain *genpd)
+{
+	struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd);
+	unsigned int mask = 1 << sh7372_pd->bit_shift;
+	unsigned int retry_count;
+	int ret = 0;
+
+	if (__raw_readl(PSTR) & mask)
+		goto out;
+
+	__raw_writel(mask, SWUCR);
+
+	for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) {
+		if (!(__raw_readl(SWUCR) & mask))
+			goto out;
+		if (retry_count > PSTR_RETRIES)
+			udelay(PSTR_DELAY_US);
+		else
+			cpu_relax();
+	}
+	if (__raw_readl(SWUCR) & mask)
+		ret = -EIO;
+
+ out:
+	pr_debug("sh7372 power domain up 0x%08x -> PSTR = 0x%08x\n",
+		 mask, __raw_readl(PSTR));
+
+	return ret;
+}
+
+static bool pd_active_wakeup(struct device *dev)
+{
+	return true;
+}
+
+void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd)
+{
+	struct generic_pm_domain *genpd = &sh7372_pd->genpd;
+
+	pm_genpd_init(genpd, NULL, false);
+	genpd->stop_device = pm_clk_suspend;
+	genpd->start_device = pm_clk_resume;
+	genpd->active_wakeup = pd_active_wakeup;
+	genpd->power_off = pd_power_down;
+	genpd->power_on = pd_power_up;
+	pd_power_up(&sh7372_pd->genpd);
+}
+
+void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd,
+				 struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+
+	if (!dev->power.subsys_data) {
+		pm_clk_init(dev);
+		pm_clk_add(dev, NULL);
+	}
+	pm_genpd_add_device(&sh7372_pd->genpd, dev);
+}
+
+struct sh7372_pm_domain sh7372_a4lc = {
+	.bit_shift = 1,
+};
+
+#endif /* CONFIG_PM */
+
 static void sh7372_enter_core_standby(void)
 {
 	void __iomem *smfram = (void __iomem *)SMFRAM;