pm_domains.c

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/*
 * 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 __maybe_unused 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))
            pm_genpd_dev_need_restore(&pdev->dev, true);
        else
            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++) {
        struct exynos_pm_domain *pd = exynos4_pm_domains[idx];
        int on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;

        pm_genpd_init(&pd->pd, NULL, !on);
    }

#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
#ifdef CONFIG_S5P_DEV_G2D
    exynos_pm_add_dev_to_genpd(&s5p_device_g2d, &exynos4_pd_lcd0);
#endif
#ifdef CONFIG_S5P_DEV_JPEG
    exynos_pm_add_dev_to_genpd(&s5p_device_jpeg, &exynos4_pd_cam);
#endif
    return 0;
}
arch_initcall(exynos4_pm_init_power_domain);

int __init exynos_pm_late_initcall(void)
{
    pm_genpd_poweroff_unused();
    return 0;
}