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authorPankaj Dubey <pankaj.dubey@samsung.com>2014-11-22 23:07:21 +0900
committerKukjin Kim <kgene.kim@samsung.com>2014-11-22 23:07:21 +0900
commit5e6473f422909a9f929619c04c6bab7620531b69 (patch)
treef1026c80ce2e7fc1082cfddcfad99d91e6dc1bc2 /drivers/clk
parent8fcc774fc72910fa26767ae8ca2da3d64ae80a01 (diff)
downloadlinux-5e6473f422909a9f929619c04c6bab7620531b69.tar.bz2
clk: exynos5440: move restart code into clock driver
Let's register restart handler for Exynos5440 from it's clock driver for restart functionality. So that we can cleanup restart hooks from machine specific file. CC: Sylwester Nawrocki <s.nawrocki@samsung.com> CC: Tomasz Figa <tomasz.figa@gmail.com> Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com> Acked-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'drivers/clk')
-rw-r--r--drivers/clk/samsung/clk-exynos5440.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/clk/samsung/clk-exynos5440.c b/drivers/clk/samsung/clk-exynos5440.c
index 00d1d00a41de..979e81389cdd 100644
--- a/drivers/clk/samsung/clk-exynos5440.c
+++ b/drivers/clk/samsung/clk-exynos5440.c
@@ -15,6 +15,8 @@
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
#include "clk.h"
#include "clk-pll.h"
@@ -23,6 +25,8 @@
#define CPU_CLK_STATUS 0xfc
#define MISC_DOUT1 0x558
+static void __iomem *reg_base;
+
/* parent clock name list */
PNAME(mout_armclk_p) = { "cplla", "cpllb" };
PNAME(mout_spi_p) = { "div125", "div200" };
@@ -89,10 +93,30 @@ static const struct of_device_id ext_clk_match[] __initconst = {
{},
};
+static int exynos5440_clk_restart_notify(struct notifier_block *this,
+ unsigned long code, void *unused)
+{
+ u32 val, status;
+
+ status = readl_relaxed(reg_base + 0xbc);
+ val = readl_relaxed(reg_base + 0xcc);
+ val = (val & 0xffff0000) | (status & 0xffff);
+ writel_relaxed(val, reg_base + 0xcc);
+
+ return NOTIFY_DONE;
+}
+
+/*
+ * Exynos5440 Clock restart notifier, handles restart functionality
+ */
+static struct notifier_block exynos5440_clk_restart_handler = {
+ .notifier_call = exynos5440_clk_restart_notify,
+ .priority = 128,
+};
+
/* register exynos5440 clocks */
static void __init exynos5440_clk_init(struct device_node *np)
{
- void __iomem *reg_base;
struct samsung_clk_provider *ctx;
reg_base = of_iomap(np, 0);
@@ -125,6 +149,9 @@ static void __init exynos5440_clk_init(struct device_node *np)
samsung_clk_of_add_provider(np, ctx);
+ if (register_restart_handler(&exynos5440_clk_restart_handler))
+ pr_warn("exynos5440 clock can't register restart handler\n");
+
pr_info("Exynos5440: arm_clk = %ldHz\n", _get_rate("arm_clk"));
pr_info("exynos5440 clock initialization complete\n");
}