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authorOlof Johansson <olof@lixom.net>2014-07-12 21:19:21 -0700
committerOlof Johansson <olof@lixom.net>2014-07-12 21:19:21 -0700
commitcacadb4ff969a82628d47db87b5a531be466b134 (patch)
treeb006cfae86bd141db07ba212b6d6d4b81f3e51a9 /arch/arm/mach-exynos
parent363d4ddc17320ad0906778924d40ba5955ccf194 (diff)
parentbed7118988ef48063c72f67cc2701c72663b3870 (diff)
downloadlinux-cacadb4ff969a82628d47db87b5a531be466b134.tar.bz2
Merge tag 'samsung-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into fixes
Merge "Samsung fixes-3 for 3.16" from Kukjin Kim: Samsung fixes-3 for v3.16 - update the parent for Auudss clock because kernel will be hang during late boot if the parent clock is disabled in bootloader. - enable clk handing in power domain because while power domain on/off, its regarding clock source will be reset and it causes a problem so need to handle it. - add mux clocks to be used by power domain for exynos5420-mfc during power domain on/off and property in device tree also. - register cpuidle only for exynos4210 and exynos5250 because a system failure will be happened on other exynos SoCs. * tag 'samsung-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung: ARM: EXYNOS: Register cpuidle device only on exynos4210 and 5250 ARM: dts: Add clock property for mfc_pd in exynos5420 clk: exynos5420: Add IDs for clocks used in PD mfc ARM: EXYNOS: Add support for clock handling in power domain ARM: dts: Update the parent for Audss clocks in Exynos5420 Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-exynos')
-rw-r--r--arch/arm/mach-exynos/exynos.c6
-rw-r--r--arch/arm/mach-exynos/pm_domains.c61
2 files changed, 62 insertions, 5 deletions
diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
index 95cad252eb1b..46d893fcbe85 100644
--- a/arch/arm/mach-exynos/exynos.c
+++ b/arch/arm/mach-exynos/exynos.c
@@ -173,10 +173,8 @@ static struct platform_device exynos_cpuidle = {
void __init exynos_cpuidle_init(void)
{
- if (soc_is_exynos5440())
- return;
-
- platform_device_register(&exynos_cpuidle);
+ if (soc_is_exynos4210() || soc_is_exynos5250())
+ platform_device_register(&exynos_cpuidle);
}
void __init exynos_cpufreq_init(void)
diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
index fe6570ebbdde..797cb134bfff 100644
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -17,6 +17,7 @@
#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>
@@ -24,6 +25,8 @@
#include "regs-pmu.h"
+#define MAX_CLK_PER_DOMAIN 4
+
/*
* Exynos specific wrapper around the generic power domain
*/
@@ -32,6 +35,9 @@ struct exynos_pm_domain {
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];
};
static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
@@ -44,6 +50,19 @@ static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
pd = container_of(domain, struct exynos_pm_domain, pd);
base = pd->base;
+ /* Set oscclk before powering off a domain*/
+ if (!power_on) {
+ int i;
+
+ 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 ? S5P_INT_LOCAL_PWR_EN : 0;
__raw_writel(pwr, base);
@@ -60,6 +79,20 @@ static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
cpu_relax();
usleep_range(80, 100);
}
+
+ /* Restore clocks after powering on a domain*/
+ if (power_on) {
+ int i;
+
+ 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);
+ }
+ }
+
return 0;
}
@@ -152,9 +185,11 @@ static __init int exynos4_pm_init_power_domain(void)
for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
struct exynos_pm_domain *pd;
- int on;
+ int on, i;
+ struct device *dev;
pdev = of_find_device_by_node(np);
+ dev = &pdev->dev;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
if (!pd) {
@@ -170,6 +205,30 @@ static __init int exynos4_pm_init_power_domain(void)
pd->pd.power_on = exynos_pd_power_on;
pd->pd.of_node = np;
+ 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:
platform_set_drvdata(pdev, pd);
on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;