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Date: Wed, 03 Sep 2014 12:05:26 -0700
From: Mike Turquette <mturquette@...aro.org>
To: Guenter Roeck <linux@...ck-us.net>,
"Russell King" <linux@....linux.org.uk>,
"Wim Van Sebroeck" <wim@...ana.be>,
"Catalin Marinas" <catalin.marinas@....com>,
"Maxime Ripard" <maxime.ripard@...e-electrons.com>,
"Andrew Morton" <akpm@...ux-foundation.org>
Cc: linux-watchdog@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
linux-samsung-soc@...r.kernel.org,
"Will Deacon" <will.deacon@....com>,
"Arnd Bergmann" <arnd@...db.de>,
"Heiko Stuebner" <heiko@...ech.de>,
"Jonas Jensen" <jonas.jensen@...il.com>,
"Randy Dunlap" <rdunlap@...radead.org>,
"Steven Rostedt" <rostedt@...dmis.org>,
"Ingo Molnar" <mingo@...nel.org>,
"Dmitry Eremin-Solenikov" <dbaryshkov@...il.com>,
"David Woodhouse" <dwmw2@...radead.org>,
"Tomasz Figa" <t.figa@...sung.com>, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, "Guenter Roeck" <linux@...ck-us.net>
Subject: Re: [PATCH v7 10/11] clk: samsung: register restart handlers for s3c2412 and
s3c2443
Quoting Guenter Roeck (2014-08-19 17:45:37)
> From: Heiko Stübner <heiko@...ech.de>
>
> S3C2412, S3C2443 and their derivatives contain a special software-reset
> register in their system-controller.
>
> Therefore register a restart handler for those.
>
> Tested on a s3c2416-based board, s3c2412 compile-tested.
>
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Acked-by: Mike Turquette <mturquette@...aro.org>
> ---
> v7: Added patch to series.
>
> drivers/clk/samsung/clk-s3c2412.c | 29 +++++++++++++++++++++++++++++
> drivers/clk/samsung/clk-s3c2443.c | 19 +++++++++++++++++++
> 2 files changed, 48 insertions(+)
>
> diff --git a/drivers/clk/samsung/clk-s3c2412.c b/drivers/clk/samsung/clk-s3c2412.c
> index 34af09f..2ceedaf 100644
> --- a/drivers/clk/samsung/clk-s3c2412.c
> +++ b/drivers/clk/samsung/clk-s3c2412.c
> @@ -14,6 +14,7 @@
> #include <linux/of.h>
> #include <linux/of_address.h>
> #include <linux/syscore_ops.h>
> +#include <linux/reboot.h>
>
> #include <dt-bindings/clock/s3c2412.h>
>
> @@ -26,6 +27,7 @@
> #define CLKCON 0x0c
> #define CLKDIVN 0x14
> #define CLKSRC 0x1c
> +#define SWRST 0x30
>
> /* list of PLLs to be registered */
> enum s3c2412_plls {
> @@ -204,6 +206,28 @@ struct samsung_clock_alias s3c2412_aliases[] __initdata = {
> ALIAS(MSYSCLK, NULL, "fclk"),
> };
>
> +static int s3c2412_restart(struct notifier_block *this,
> + unsigned long mode, void *cmd)
> +{
> + /* errata "Watch-dog/Software Reset Problem" specifies that
> + * this reset must be done with the SYSCLK sourced from
> + * EXTCLK instead of FOUT to avoid a glitch in the reset
> + * mechanism.
> + *
> + * See the watchdog section of the S3C2412 manual for more
> + * information on this fix.
> + */
> +
> + __raw_writel(0x00, reg_base + CLKSRC);
> + __raw_writel(0x533C2412, reg_base + SWRST);
> + return NOTIFY_DONE;
> +}
> +
> +static struct notifier_block s3c2412_restart_handler = {
> + .notifier_call = s3c2412_restart,
> + .priority = 129,
> +};
> +
> /*
> * fixed rate clocks generated outside the soc
> * Only necessary until the devicetree-move is complete
> @@ -233,6 +257,7 @@ void __init s3c2412_common_clk_init(struct device_node *np, unsigned long xti_f,
> unsigned long ext_f, void __iomem *base)
> {
> struct samsung_clk_provider *ctx;
> + int ret;
> reg_base = base;
>
> if (np) {
> @@ -267,6 +292,10 @@ void __init s3c2412_common_clk_init(struct device_node *np, unsigned long xti_f,
> s3c2412_clk_sleep_init();
>
> samsung_clk_of_add_provider(np, ctx);
> +
> + ret = register_restart_handler(&s3c2412_restart_handler);
> + if (ret)
> + pr_warn("cannot register restart handler, %d\n", ret);
> }
>
> static void __init s3c2412_clk_init(struct device_node *np)
> diff --git a/drivers/clk/samsung/clk-s3c2443.c b/drivers/clk/samsung/clk-s3c2443.c
> index c92f853..0c3c182 100644
> --- a/drivers/clk/samsung/clk-s3c2443.c
> +++ b/drivers/clk/samsung/clk-s3c2443.c
> @@ -14,6 +14,7 @@
> #include <linux/of.h>
> #include <linux/of_address.h>
> #include <linux/syscore_ops.h>
> +#include <linux/reboot.h>
>
> #include <dt-bindings/clock/s3c2443.h>
>
> @@ -33,6 +34,7 @@
> #define HCLKCON 0x30
> #define PCLKCON 0x34
> #define SCLKCON 0x38
> +#define SWRST 0x44
>
> /* the soc types */
> enum supported_socs {
> @@ -354,6 +356,18 @@ struct samsung_clock_alias s3c2450_aliases[] __initdata = {
> ALIAS(PCLK_I2C1, "s3c2410-i2c.1", "i2c"),
> };
>
> +static int s3c2443_restart(struct notifier_block *this,
> + unsigned long mode, void *cmd)
> +{
> + __raw_writel(0x533c2443, reg_base + SWRST);
> + return NOTIFY_DONE;
> +}
> +
> +static struct notifier_block s3c2443_restart_handler = {
> + .notifier_call = s3c2443_restart,
> + .priority = 129,
> +};
> +
> /*
> * fixed rate clocks generated outside the soc
> * Only necessary until the devicetree-move is complete
> @@ -378,6 +392,7 @@ void __init s3c2443_common_clk_init(struct device_node *np, unsigned long xti_f,
> void __iomem *base)
> {
> struct samsung_clk_provider *ctx;
> + int ret;
> reg_base = base;
>
> if (np) {
> @@ -447,6 +462,10 @@ void __init s3c2443_common_clk_init(struct device_node *np, unsigned long xti_f,
> s3c2443_clk_sleep_init();
>
> samsung_clk_of_add_provider(np, ctx);
> +
> + ret = register_restart_handler(&s3c2443_restart_handler);
> + if (ret)
> + pr_warn("cannot register restart handler, %d\n", ret);
> }
>
> static void __init s3c2416_clk_init(struct device_node *np)
> --
> 1.9.1
>
> --
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