pm-rmobile.c

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/*
 * rmobile power management support
 *
 * Copyright (C) 2012  Renesas Solutions Corp.
 * Copyright (C) 2012  Kuninori Morimoto <[email protected]>
 *
 * 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       IOMEM(0xe6180008)
#define SWUCR       IOMEM(0xe6180014)
#define PSTR        IOMEM(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;
}

static 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_init_domains(struct rmobile_pm_domain domains[], int num)
{
    int j;

    for (j = 0; j < num; j++)
        rmobile_init_pm_domain(&domains[j]);
}

void rmobile_add_device_to_domain_td(const char *domain_name,
                     struct platform_device *pdev,
                     struct gpd_timing_data *td)
{
    struct device *dev = &pdev->dev;

    __pm_genpd_name_add_device(domain_name, dev, td);
    if (pm_clk_no_clocks(dev))
        pm_clk_add(dev, NULL);
}

void rmobile_add_devices_to_domains(struct pm_domain_device data[],
                    int size)
{
    struct gpd_timing_data latencies = {
        .stop_latency_ns = DEFAULT_DEV_LATENCY_NS,
        .start_latency_ns = DEFAULT_DEV_LATENCY_NS,
        .save_state_latency_ns = DEFAULT_DEV_LATENCY_NS,
        .restore_state_latency_ns = DEFAULT_DEV_LATENCY_NS,
    };
    int j;

    for (j = 0; j < size; j++)
        rmobile_add_device_to_domain_td(data[j].domain_name,
                        data[j].pdev, &latencies);
}
#endif /* CONFIG_PM */