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>

3 files changed, 130 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/board-mackerel.c b/arch/arm/mach-shmobile/board-mackerel.c
index 3802f2afabef..f93b1cb27fef 100644
--- a/arch/arm/mach-shmobile/board-mackerel.c
+++ b/arch/arm/mach-shmobile/board-mackerel.c
@@ -1582,6 +1582,10 @@ static void __init mackerel_init(void)
 
         platform_add_devices(mackerel_devices, ARRAY_SIZE(mackerel_devices));
 
+        sh7372_init_pm_domain(&sh7372_a4lc);
+        sh7372_add_device_to_domain(&sh7372_a4lc, &lcdc_device);
+        sh7372_add_device_to_domain(&sh7372_a4lc, &hdmi_lcdc_device);
+
         hdmi_init_pm_clock();
         sh7372_pm_init();
 }
diff --git a/arch/arm/mach-shmobile/include/mach/sh7372.h b/arch/arm/mach-shmobile/include/mach/sh7372.h
index df20d7670172..495013c75c6b 100644
--- a/arch/arm/mach-shmobile/include/mach/sh7372.h
+++ b/arch/arm/mach-shmobile/include/mach/sh7372.h
@@ -12,6 +12,7 @@
 #define __ASM_SH7372_H__
 
 #include <linux/sh_clk.h>
+#include <linux/pm_domain.h>
 
 /*
  * Pin Function Controller:
@@ -470,4 +471,27 @@ extern struct clk sh7372_fsibck_clk;
 extern struct clk sh7372_fsidiva_clk;
 extern struct clk sh7372_fsidivb_clk;
 
+struct platform_device;
+
+struct sh7372_pm_domain {
+        struct generic_pm_domain genpd;
+        unsigned int bit_shift;
+};
+
+static inline struct sh7372_pm_domain *to_sh7372_pd(struct generic_pm_domain *d)
+{
+        return container_of(d, struct sh7372_pm_domain, genpd);
+}
+
+#ifdef CONFIG_PM
+extern struct sh7372_pm_domain sh7372_a4lc;
+
+extern void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd);
+extern void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd,
+                                        struct platform_device *pdev);
+#else
+#define sh7372_init_pm_domain(pd) do { } while(0)
+#define sh7372_add_device_to_domain(pd, pdev) do { } while(0)
+#endif /* CONFIG_PM */
+
 #endif /* __ASM_SH7372_H__ */
diff --git a/arch/arm/mach-shmobile/pm-sh7372.c b/arch/arm/mach-shmobile/pm-sh7372.c
index 8e4aadf14c9f..e17f12424ec7 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;