forked from Minki/linux
70e9d7b59f
The power domain nodes in DTS may be very generic (e.g. "power-domain" for Exynos 5420) making it very hard to debug: $ cat /sys/kernel/debug/pm_genpd/pm_genpd_summary domain status slaves power-domain on Use platform device name instead so the names will be a little more user friendly: domain status slaves 100440e0.power-domain on Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Suggested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Suggested-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Reviewed-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Kukjin Kim <kgene@kernel.org>
186 lines
4.3 KiB
C
186 lines
4.3 KiB
C
/*
|
|
* 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/clk.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/sched.h>
|
|
|
|
#define INT_LOCAL_PWR_EN 0x7
|
|
#define MAX_CLK_PER_DOMAIN 4
|
|
|
|
/*
|
|
* 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;
|
|
struct clk *oscclk;
|
|
struct clk *clk[MAX_CLK_PER_DOMAIN];
|
|
struct clk *pclk[MAX_CLK_PER_DOMAIN];
|
|
struct clk *asb_clk[MAX_CLK_PER_DOMAIN];
|
|
};
|
|
|
|
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;
|
|
int i;
|
|
|
|
pd = container_of(domain, struct exynos_pm_domain, pd);
|
|
base = pd->base;
|
|
|
|
for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
|
|
if (IS_ERR(pd->asb_clk[i]))
|
|
break;
|
|
clk_prepare_enable(pd->asb_clk[i]);
|
|
}
|
|
|
|
/* Set oscclk before powering off a domain*/
|
|
if (!power_on) {
|
|
for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
|
|
if (IS_ERR(pd->clk[i]))
|
|
break;
|
|
if (clk_set_parent(pd->clk[i], pd->oscclk))
|
|
pr_err("%s: error setting oscclk as parent to clock %d\n",
|
|
pd->name, i);
|
|
}
|
|
}
|
|
|
|
pwr = power_on ? INT_LOCAL_PWR_EN : 0;
|
|
__raw_writel(pwr, base);
|
|
|
|
/* Wait max 1ms */
|
|
timeout = 10;
|
|
|
|
while ((__raw_readl(base + 0x4) & 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);
|
|
}
|
|
|
|
/* Restore clocks after powering on a domain*/
|
|
if (power_on) {
|
|
for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
|
|
if (IS_ERR(pd->clk[i]))
|
|
break;
|
|
if (clk_set_parent(pd->clk[i], pd->pclk[i]))
|
|
pr_err("%s: error setting parent to clock%d\n",
|
|
pd->name, i);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
|
|
if (IS_ERR(pd->asb_clk[i]))
|
|
break;
|
|
clk_disable_unprepare(pd->asb_clk[i]);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static __init int exynos4_pm_init_power_domain(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, i;
|
|
struct device *dev;
|
|
|
|
pdev = of_find_device_by_node(np);
|
|
dev = &pdev->dev;
|
|
|
|
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(dev_name(dev), 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;
|
|
|
|
for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
|
|
char clk_name[8];
|
|
|
|
snprintf(clk_name, sizeof(clk_name), "asb%d", i);
|
|
pd->asb_clk[i] = clk_get(dev, clk_name);
|
|
if (IS_ERR(pd->asb_clk[i]))
|
|
break;
|
|
}
|
|
|
|
pd->oscclk = clk_get(dev, "oscclk");
|
|
if (IS_ERR(pd->oscclk))
|
|
goto no_clk;
|
|
|
|
for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
|
|
char clk_name[8];
|
|
|
|
snprintf(clk_name, sizeof(clk_name), "clk%d", i);
|
|
pd->clk[i] = clk_get(dev, clk_name);
|
|
if (IS_ERR(pd->clk[i]))
|
|
break;
|
|
snprintf(clk_name, sizeof(clk_name), "pclk%d", i);
|
|
pd->pclk[i] = clk_get(dev, clk_name);
|
|
if (IS_ERR(pd->pclk[i])) {
|
|
clk_put(pd->clk[i]);
|
|
pd->clk[i] = ERR_PTR(-EINVAL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (IS_ERR(pd->clk[0]))
|
|
clk_put(pd->oscclk);
|
|
|
|
no_clk:
|
|
on = __raw_readl(pd->base + 0x4) & INT_LOCAL_PWR_EN;
|
|
|
|
pm_genpd_init(&pd->pd, NULL, !on);
|
|
of_genpd_add_provider_simple(np, &pd->pd);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(exynos4_pm_init_power_domain);
|