ARM: shmobile: soc-core: add R-mobile PM domain common APIs

This patch adds Renesas R-mobile series common PM domain APIs.
R-mobile CPU can use/switch this API

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

3 files changed, 212 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-shmobile/Makefile
index 8aa1962c22a2..3ffe4126922f 100644
--- a/arch/arm/mach-shmobile/Makefile
+++ b/arch/arm/mach-shmobile/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_ARCH_R8A7740)	+= entry-intc.o
 # PM objects
 obj-$(CONFIG_SUSPEND)           += suspend.o
 obj-$(CONFIG_CPU_IDLE)          += cpuidle.o
+obj-$(CONFIG_ARCH_SHMOBILE)     += pm-rmobile.o
 obj-$(CONFIG_ARCH_SH7372)       += pm-sh7372.o sleep-sh7372.o
 obj-$(CONFIG_ARCH_R8A7779)      += pm-r8a7779.o
 
diff --git a/arch/arm/mach-shmobile/include/mach/pm-rmobile.h b/arch/arm/mach-shmobile/include/mach/pm-rmobile.h
new file mode 100644
index 000000000000..5a402840fe28
--- /dev/null
+++ b/arch/arm/mach-shmobile/include/mach/pm-rmobile.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ *
+ * Kuninori Morimoto <morimoto.kuninori@renesas.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#ifndef PM_RMOBILE_H
+#define PM_RMOBILE_H
+
+#include <linux/pm_domain.h>
+
+struct platform_device;
+
+struct rmobile_pm_domain {
+        struct generic_pm_domain genpd;
+        struct dev_power_governor *gov;
+        int (*suspend)(void);
+        void (*resume)(void);
+        unsigned int bit_shift;
+        bool no_debug;
+};
+
+static inline
+struct rmobile_pm_domain *to_rmobile_pd(struct generic_pm_domain *d)
+{
+        return container_of(d, struct rmobile_pm_domain, genpd);
+}
+
+#ifdef CONFIG_PM
+extern void rmobile_init_pm_domain(struct rmobile_pm_domain *rmobile_pd);
+extern void rmobile_add_device_to_domain(struct rmobile_pm_domain *rmobile_pd,
+                                        struct platform_device *pdev);
+extern void rmobile_pm_add_subdomain(struct rmobile_pm_domain *rmobile_pd,
+                                    struct rmobile_pm_domain *rmobile_sd);
+#else
+#define rmobile_init_pm_domain(pd) do { } while (0)
+#define rmobile_add_device_to_domain(pd, pdev) do { } while (0)
+#define rmobile_pm_add_subdomain(pd, sd) do { } while (0)
+#endif /* CONFIG_PM */
+
+#endif /* PM_RMOBILE_H */
diff --git a/arch/arm/mach-shmobile/pm-rmobile.c b/arch/arm/mach-shmobile/pm-rmobile.c
new file mode 100644
index 000000000000..a8562540f1d6
--- /dev/null
+++ b/arch/arm/mach-shmobile/pm-rmobile.c
@@ -0,0 +1,167 @@
+/*
+ * rmobile power management support
+ *
+ * Copyright (C) 2012  Renesas Solutions Corp.
+ * Copyright (C) 2012  Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ *
+ * based on pm-sh7372.c
+ *  Copyright (C) 2011 Magnus Damm
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_clock.h>
+#include <asm/io.h>
+#include <mach/pm-rmobile.h>
+
+/* SYSC */
+#define SPDCR           0xe6180008
+#define SWUCR           0xe6180014
+#define PSTR            0xe6180080
+
+#define PSTR_RETRIES    100
+#define PSTR_DELAY_US   10
+
+#ifdef CONFIG_PM
+static int rmobile_pd_power_down(struct generic_pm_domain *genpd)
+{
+        struct rmobile_pm_domain *rmobile_pd = to_rmobile_pd(genpd);
+        unsigned int mask = 1 << rmobile_pd->bit_shift;
+
+        if (rmobile_pd->suspend) {
+                int ret = rmobile_pd->suspend();
+
+                if (ret)
+                        return ret;
+        }
+
+        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();
+                }
+        }
+
+        if (!rmobile_pd->no_debug)
+                pr_debug("%s: Power off, 0x%08x -> PSTR = 0x%08x\n",
+                         genpd->name, mask, __raw_readl(PSTR));
+
+        return 0;
+}
+
+static int __rmobile_pd_power_up(struct rmobile_pm_domain *rmobile_pd,
+                                 bool do_resume)
+{
+        unsigned int mask = 1 << rmobile_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))
+                        break;
+                if (retry_count > PSTR_RETRIES)
+                        udelay(PSTR_DELAY_US);
+                else
+                        cpu_relax();
+        }
+        if (!retry_count)
+                ret = -EIO;
+
+        if (!rmobile_pd->no_debug)
+                pr_debug("%s: Power on, 0x%08x -> PSTR = 0x%08x\n",
+                         rmobile_pd->genpd.name, mask, __raw_readl(PSTR));
+
+out:
+        if (ret == 0 && rmobile_pd->resume && do_resume)
+                rmobile_pd->resume();
+
+        return ret;
+}
+
+static int rmobile_pd_power_up(struct generic_pm_domain *genpd)
+{
+        return __rmobile_pd_power_up(to_rmobile_pd(genpd), true);
+}
+
+static bool rmobile_pd_active_wakeup(struct device *dev)
+{
+        bool (*active_wakeup)(struct device *dev);
+
+        active_wakeup = dev_gpd_data(dev)->ops.active_wakeup;
+        return active_wakeup ? active_wakeup(dev) : true;
+}
+
+static int rmobile_pd_stop_dev(struct device *dev)
+{
+        int (*stop)(struct device *dev);
+
+        stop = dev_gpd_data(dev)->ops.stop;
+        if (stop) {
+                int ret = stop(dev);
+                if (ret)
+                        return ret;
+        }
+        return pm_clk_suspend(dev);
+}
+
+static int rmobile_pd_start_dev(struct device *dev)
+{
+        int (*start)(struct device *dev);
+        int ret;
+
+        ret = pm_clk_resume(dev);
+        if (ret)
+                return ret;
+
+        start = dev_gpd_data(dev)->ops.start;
+        if (start)
+                ret = start(dev);
+
+        return ret;
+}
+
+void rmobile_init_pm_domain(struct rmobile_pm_domain *rmobile_pd)
+{
+        struct generic_pm_domain *genpd = &rmobile_pd->genpd;
+        struct dev_power_governor *gov = rmobile_pd->gov;
+
+        pm_genpd_init(genpd, gov ? : &simple_qos_governor, false);
+        genpd->dev_ops.stop             = rmobile_pd_stop_dev;
+        genpd->dev_ops.start            = rmobile_pd_start_dev;
+        genpd->dev_ops.active_wakeup    = rmobile_pd_active_wakeup;
+        genpd->dev_irq_safe             = true;
+        genpd->power_off                = rmobile_pd_power_down;
+        genpd->power_on                 = rmobile_pd_power_up;
+        __rmobile_pd_power_up(rmobile_pd, false);
+}
+
+void rmobile_add_device_to_domain(struct rmobile_pm_domain *rmobile_pd,
+                                 struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+
+        pm_genpd_add_device(&rmobile_pd->genpd, dev);
+        if (pm_clk_no_clocks(dev))
+                pm_clk_add(dev, NULL);
+}
+
+void rmobile_pm_add_subdomain(struct rmobile_pm_domain *rmobile_pd,
+                             struct rmobile_pm_domain *rmobile_sd)
+{
+        pm_genpd_add_subdomain(&rmobile_pd->genpd, &rmobile_sd->genpd);
+}
+#endif /* CONFIG_PM */