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linux-next/arch/arm/mach-exynos/pm_domains.c
Tomasz Figa 8a65d2365d ARM: EXYNOS: Bind devices to power domains using DT 
This patch adds a way to specify bindings between devices and power
domains using device tree.

A device can be bound to particular power domain by adding a
power-domain property containing a phandle to the domain. The device
will be bound to the domain before binding a driver to it and unbound
after unbinding a driver from it.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2012-11-22 00:38:59 +09:00

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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 <linux/of_platform.h>
#include <linux/sched.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 void exynos_add_device_to_domain(struct exynos_pm_domain *pd,
struct device *dev)
{
int ret;
dev_dbg(dev, "adding to power domain %s\n", pd->pd.name);
while (1) {
ret = pm_genpd_add_device(&pd->pd, dev);
if (ret != -EAGAIN)
break;
cond_resched();
}
pm_genpd_dev_need_restore(dev, true);
}
static void exynos_remove_device_from_domain(struct device *dev)
{
struct generic_pm_domain *genpd = dev_to_genpd(dev);
int ret;
dev_dbg(dev, "removing from power domain %s\n", genpd->name);
while (1) {
ret = pm_genpd_remove_device(genpd, dev);
if (ret != -EAGAIN)
break;
cond_resched();
}
}
static void exynos_read_domain_from_dt(struct device *dev)
{
struct platform_device *pd_pdev;
struct exynos_pm_domain *pd;
struct device_node *node;
node = of_parse_phandle(dev->of_node, "samsung,power-domain", 0);
if (!node)
return;
pd_pdev = of_find_device_by_node(node);
if (!pd_pdev)
return;
pd = platform_get_drvdata(pd_pdev);
exynos_add_device_to_domain(pd, dev);
}
static int exynos_pm_notifier_call(struct notifier_block *nb,
unsigned long event, void *data)
{
struct device *dev = data;
switch (event) {
case BUS_NOTIFY_BIND_DRIVER:
if (dev->of_node)
exynos_read_domain_from_dt(dev);
break;
case BUS_NOTIFY_UNBOUND_DRIVER:
exynos_remove_device_from_domain(dev);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block platform_nb = {
.notifier_call = exynos_pm_notifier_call,
};
static __init int exynos_pm_dt_parse_domains(void)
{
struct platform_device *pdev;
struct device_node *np;
for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
struct exynos_pm_domain *pd;
int on;
pdev = of_find_device_by_node(np);
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
if (!pd) {
pr_err("%s: failed to allocate memory for domain\n",
__func__);
return -ENOMEM;
}
pd->pd.name = kstrdup(np->name, GFP_KERNEL);
pd->name = pd->pd.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;
platform_set_drvdata(pdev, pd);
on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
pm_genpd_init(&pd->pd, NULL, !on);
}
bus_register_notifier(&platform_bus_type, &platform_nb);
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;
}
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