ARM: EXYNOS: Hook up power domains to generic power domain infrastructure

Add support for generic power domain for Exynos4 platforms and remove the
Samsung specific power domain control for Exynos4.

The generic power domain infrastructure is used to control the power domains
available on Exynos4. For non-dt platforms, the power domains are statically
instantiated. For dt platforms, the power domain nodes found in the device
tree are instantiated.

Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 195 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
new file mode 100644
index 000000000000..0b04af2b13cc
--- /dev/null
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -0,0 +1,195 @@
+/*
+ * Exynos Generic power domain support.
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * Implementation of Exynos specific power domain control which is used in
+ * conjunction with runtime-pm. Support for both device-tree and non-device-tree
+ * based power domain support is included.
+ *
+ * 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/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/pm_domain.h>
+#include <linux/delay.h>
+#include <linux/of_address.h>
+
+#include <mach/regs-pmu.h>
+#include <plat/devs.h>
+
+/*
+ * Exynos specific wrapper around the generic power domain
+ */
+struct exynos_pm_domain {
+        void __iomem *base;
+        char const *name;
+        bool is_off;
+        struct generic_pm_domain pd;
+};
+
+static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
+{
+        struct exynos_pm_domain *pd;
+        void __iomem *base;
+        u32 timeout, pwr;
+        char *op;
+
+        pd = container_of(domain, struct exynos_pm_domain, pd);
+        base = pd->base;
+
+        pwr = power_on ? S5P_INT_LOCAL_PWR_EN : 0;
+        __raw_writel(pwr, base);
+
+        /* Wait max 1ms */
+        timeout = 10;
+
+        while ((__raw_readl(base + 0x4) & S5P_INT_LOCAL_PWR_EN) != pwr) {
+                if (!timeout) {
+                        op = (power_on) ? "enable" : "disable";
+                        pr_err("Power domain %s %s failed\n", domain->name, op);
+                        return -ETIMEDOUT;
+                }
+                timeout--;
+                cpu_relax();
+                usleep_range(80, 100);
+        }
+        return 0;
+}
+
+static int exynos_pd_power_on(struct generic_pm_domain *domain)
+{
+        return exynos_pd_power(domain, true);
+}
+
+static int exynos_pd_power_off(struct generic_pm_domain *domain)
+{
+        return exynos_pd_power(domain, false);
+}
+
+#define EXYNOS_GPD(PD, BASE, NAME)                      \
+static struct exynos_pm_domain PD = {                   \
+        .base = (void __iomem *)BASE,                   \
+        .name = NAME,                                   \
+        .pd = {                                         \
+                .power_off = exynos_pd_power_off,       \
+                .power_on = exynos_pd_power_on, \
+        },                                              \
+}
+
+#ifdef CONFIG_OF
+static __init int exynos_pm_dt_parse_domains(void)
+{
+        struct device_node *np;
+
+        for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
+                struct exynos_pm_domain *pd;
+
+                pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+                if (!pd) {
+                        pr_err("%s: failed to allocate memory for domain\n",
+                                        __func__);
+                        return -ENOMEM;
+                }
+
+                if (of_get_property(np, "samsung,exynos4210-pd-off", NULL))
+                        pd->is_off = true;
+                pd->name = np->name;
+                pd->base = of_iomap(np, 0);
+                pd->pd.power_off = exynos_pd_power_off;
+                pd->pd.power_on = exynos_pd_power_on;
+                pd->pd.of_node = np;
+                pm_genpd_init(&pd->pd, NULL, false);
+        }
+        return 0;
+}
+#else
+static __init int exynos_pm_dt_parse_domains(void)
+{
+        return 0;
+}
+#endif /* CONFIG_OF */
+
+static __init void exynos_pm_add_dev_to_genpd(struct platform_device *pdev,
+                                                struct exynos_pm_domain *pd)
+{
+        if (pdev->dev.bus) {
+                if (pm_genpd_add_device(&pd->pd, &pdev->dev))
+                        pr_info("%s: error in adding %s device to %s power"
+                                "domain\n", __func__, dev_name(&pdev->dev),
+                                pd->name);
+        }
+}
+
+EXYNOS_GPD(exynos4_pd_mfc, S5P_PMU_MFC_CONF, "pd-mfc");
+EXYNOS_GPD(exynos4_pd_g3d, S5P_PMU_G3D_CONF, "pd-g3d");
+EXYNOS_GPD(exynos4_pd_lcd0, S5P_PMU_LCD0_CONF, "pd-lcd0");
+EXYNOS_GPD(exynos4_pd_lcd1, S5P_PMU_LCD1_CONF, "pd-lcd1");
+EXYNOS_GPD(exynos4_pd_tv, S5P_PMU_TV_CONF, "pd-tv");
+EXYNOS_GPD(exynos4_pd_cam, S5P_PMU_CAM_CONF, "pd-cam");
+EXYNOS_GPD(exynos4_pd_gps, S5P_PMU_GPS_CONF, "pd-gps");
+
+static struct exynos_pm_domain *exynos4_pm_domains[] = {
+        &exynos4_pd_mfc,
+        &exynos4_pd_g3d,
+        &exynos4_pd_lcd0,
+        &exynos4_pd_lcd1,
+        &exynos4_pd_tv,
+        &exynos4_pd_cam,
+        &exynos4_pd_gps,
+};
+
+static __init int exynos4_pm_init_power_domain(void)
+{
+        int idx;
+
+        if (of_have_populated_dt())
+                return exynos_pm_dt_parse_domains();
+
+        for (idx = 0; idx < ARRAY_SIZE(exynos4_pm_domains); idx++)
+                pm_genpd_init(&exynos4_pm_domains[idx]->pd, NULL,
+                                exynos4_pm_domains[idx]->is_off);
+
+#ifdef CONFIG_S5P_DEV_FIMD0
+        exynos_pm_add_dev_to_genpd(&s5p_device_fimd0, &exynos4_pd_lcd0);
+#endif
+#ifdef CONFIG_S5P_DEV_TV
+        exynos_pm_add_dev_to_genpd(&s5p_device_hdmi, &exynos4_pd_tv);
+        exynos_pm_add_dev_to_genpd(&s5p_device_mixer, &exynos4_pd_tv);
+#endif
+#ifdef CONFIG_S5P_DEV_MFC
+        exynos_pm_add_dev_to_genpd(&s5p_device_mfc, &exynos4_pd_mfc);
+#endif
+#ifdef CONFIG_S5P_DEV_FIMC0
+        exynos_pm_add_dev_to_genpd(&s5p_device_fimc0, &exynos4_pd_cam);
+#endif
+#ifdef CONFIG_S5P_DEV_FIMC1
+        exynos_pm_add_dev_to_genpd(&s5p_device_fimc1, &exynos4_pd_cam);
+#endif
+#ifdef CONFIG_S5P_DEV_FIMC2
+        exynos_pm_add_dev_to_genpd(&s5p_device_fimc2, &exynos4_pd_cam);
+#endif
+#ifdef CONFIG_S5P_DEV_FIMC3
+        exynos_pm_add_dev_to_genpd(&s5p_device_fimc3, &exynos4_pd_cam);
+#endif
+#ifdef CONFIG_S5P_DEV_CSIS0
+        exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis0, &exynos4_pd_cam);
+#endif
+#ifdef CONFIG_S5P_DEV_CSIS1
+        exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis1, &exynos4_pd_cam);
+#endif
+        return 0;
+}
+arch_initcall(exynos4_pm_init_power_domain);
+
+static __init int exynos_pm_late_initcall(void)
+{
+        pm_genpd_poweroff_unused();
+        return 0;
+}
+late_initcall(exynos_pm_late_initcall);