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/*
* Copyright (C) 2015 Linaro Ltd.
*
* Author: Jun Nie <jun.nie@linaro.org>
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/slab.h>
#define PCU_DM_CLKEN 0x18
#define PCU_DM_RSTEN 0x1C
#define PCU_DM_ISOEN 0x20
#define PCU_DM_PWRDN 0x24
#define PCU_DM_ACK_SYNC 0x28
enum {
PCU_DM_NEON0 = 0,
PCU_DM_NEON1,
PCU_DM_GPU,
PCU_DM_DECPPU,
PCU_DM_VOU,
PCU_DM_R2D,
PCU_DM_TOP,
};
static void __iomem *pcubase;
struct zx_pm_domain {
struct generic_pm_domain dm;
unsigned int bit;
};
static int normal_power_off(struct generic_pm_domain *domain)
{
struct zx_pm_domain *zpd = (struct zx_pm_domain *)domain;
unsigned long loop = 1000;
u32 tmp;
tmp = readl_relaxed(pcubase + PCU_DM_CLKEN);
tmp &= ~BIT(zpd->bit);
writel_relaxed(tmp, pcubase + PCU_DM_CLKEN);
udelay(5);
tmp = readl_relaxed(pcubase + PCU_DM_ISOEN);
tmp &= ~BIT(zpd->bit);
writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_ISOEN);
udelay(5);
tmp = readl_relaxed(pcubase + PCU_DM_RSTEN);
tmp &= ~BIT(zpd->bit);
writel_relaxed(tmp, pcubase + PCU_DM_RSTEN);
udelay(5);
tmp = readl_relaxed(pcubase + PCU_DM_PWRDN);
tmp &= ~BIT(zpd->bit);
writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_PWRDN);
do {
tmp = readl_relaxed(pcubase + PCU_DM_ACK_SYNC) & BIT(zpd->bit);
} while (--loop && !tmp);
if (!loop) {
pr_err("Error: %s %s fail\n", __func__, domain->name);
return -EIO;
}
return 0;
}
static int normal_power_on(struct generic_pm_domain *domain)
{
struct zx_pm_domain *zpd = (struct zx_pm_domain *)domain;
unsigned long loop = 10000;
u32 tmp;
tmp = readl_relaxed(pcubase + PCU_DM_PWRDN);
tmp &= ~BIT(zpd->bit);
writel_relaxed(tmp, pcubase + PCU_DM_PWRDN);
do {
tmp = readl_relaxed(pcubase + PCU_DM_ACK_SYNC) & BIT(zpd->bit);
} while (--loop && tmp);
if (!loop) {
pr_err("Error: %s %s fail\n", __func__, domain->name);
return -EIO;
}
tmp = readl_relaxed(pcubase + PCU_DM_RSTEN);
tmp &= ~BIT(zpd->bit);
writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_RSTEN);
udelay(5);
tmp = readl_relaxed(pcubase + PCU_DM_ISOEN);
tmp &= ~BIT(zpd->bit);
writel_relaxed(tmp, pcubase + PCU_DM_ISOEN);
udelay(5);
tmp = readl_relaxed(pcubase + PCU_DM_CLKEN);
tmp &= ~BIT(zpd->bit);
writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_CLKEN);
udelay(5);
return 0;
}
static struct zx_pm_domain gpu_domain = {
.dm = {
.name = "gpu_domain",
.power_off = normal_power_off,
.power_on = normal_power_on,
},
.bit = PCU_DM_GPU,
};
static struct zx_pm_domain decppu_domain = {
.dm = {
.name = "decppu_domain",
.power_off = normal_power_off,
.power_on = normal_power_on,
},
.bit = PCU_DM_DECPPU,
};
static struct zx_pm_domain vou_domain = {
.dm = {
.name = "vou_domain",
.power_off = normal_power_off,
.power_on = normal_power_on,
},
.bit = PCU_DM_VOU,
};
static struct zx_pm_domain r2d_domain = {
.dm = {
.name = "r2d_domain",
.power_off = normal_power_off,
.power_on = normal_power_on,
},
.bit = PCU_DM_R2D,
};
static struct generic_pm_domain *zx296702_pm_domains[] = {
&vou_domain.dm,
&gpu_domain.dm,
&decppu_domain.dm,
&r2d_domain.dm,
};
static int zx296702_pd_probe(struct platform_device *pdev)
{
struct genpd_onecell_data *genpd_data;
struct resource *res;
int i;
genpd_data = devm_kzalloc(&pdev->dev, sizeof(*genpd_data), GFP_KERNEL);
if (!genpd_data)
return -ENOMEM;
genpd_data->domains = zx296702_pm_domains;
genpd_data->num_domains = ARRAY_SIZE(zx296702_pm_domains);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "no memory resource defined\n");
return -ENODEV;
}
pcubase = devm_ioremap_resource(&pdev->dev, res);
if (!pcubase) {
dev_err(&pdev->dev, "ioremap fail.\n");
return -EIO;
}
for (i = 0; i < ARRAY_SIZE(zx296702_pm_domains); ++i)
pm_genpd_init(zx296702_pm_domains[i], NULL, false);
of_genpd_add_provider_onecell(pdev->dev.of_node, genpd_data);
return 0;
}
static const struct of_device_id zx296702_pm_domain_matches[] __initconst = {
{ .compatible = "zte,zx296702-pcu", },
{ },
};
static struct platform_driver zx296702_pd_driver __initdata = {
.driver = {
.name = "zx-powerdomain",
.owner = THIS_MODULE,
.of_match_table = zx296702_pm_domain_matches,
},
.probe = zx296702_pd_probe,
};
static int __init zx296702_pd_init(void)
{
return platform_driver_register(&zx296702_pd_driver);
}
subsys_initcall(zx296702_pd_init);
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