diff options
Diffstat (limited to 'drivers/clk/samsung/clk-exynos5440.c')
| -rw-r--r-- | drivers/clk/samsung/clk-exynos5440.c | 29 |
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"); } |