[PATCH 6/7] ARM: s3c64xx: Switch to generic watchdog driver reset

Krzysztof Kozlowski
2020-07-29T16:11:37Z

Similarly to commit f6361c6b3880 ("ARM: S3C24XX: remove separate restart
code"), the platform watchdog reset code can be removed in favor of
a generic watchdog driver which already handles reset.

This allows removal of a bunch of machine code and fixes also W=1
compile warnings:

arch/arm/plat-samsung/watchdog-reset.c:29:6: warning: no previous prototype for 'samsung_wdt_reset' [-Wmissing-prototypes]
29 | void samsung_wdt_reset(void)
| ^~~~~~~~~~~~~~~~~
arch/arm/plat-samsung/watchdog-reset.c:69:13: warning: no previous prototype for 'samsung_wdt_reset_of_init' [-Wmissing-prototypes]
69 | void __init samsung_wdt_reset_of_init(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/arm/plat-samsung/watchdog-reset.c:89:13: warning: no previous prototype for 'samsung_wdt_reset_init' [-Wmissing-prototypes]
89 | void __init samsung_wdt_reset_init(void __iomem *base)

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
arch/arm/mach-s3c64xx/Kconfig | 3 +-
arch/arm/mach-s3c64xx/common.c | 15 +---
arch/arm/mach-s3c64xx/common.h | 2 -
arch/arm/mach-s3c64xx/mach-anw6410.c | 1 -
arch/arm/mach-s3c64xx/mach-crag6410.c | 1 -
arch/arm/mach-s3c64xx/mach-hmt.c | 1 -
arch/arm/mach-s3c64xx/mach-mini6410.c | 1 -
arch/arm/mach-s3c64xx/mach-ncp.c | 1 -
arch/arm/mach-s3c64xx/mach-real6410.c | 1 -
arch/arm/mach-s3c64xx/mach-s3c64xx-dt.c | 17 -----
arch/arm/mach-s3c64xx/mach-smartq5.c | 1 -
arch/arm/mach-s3c64xx/mach-smartq7.c | 1 -
arch/arm/mach-s3c64xx/mach-smdk6400.c | 1 -
arch/arm/mach-s3c64xx/mach-smdk6410.c | 1 -
arch/arm/mach-s3c64xx/watchdog-reset.h | 16 -----
arch/arm/plat-samsung/Kconfig | 6 --
arch/arm/plat-samsung/Makefile | 1 -
arch/arm/plat-samsung/watchdog-reset.c | 93 -------------------------
18 files changed, 5 insertions(+), 158 deletions(-)
delete mode 100644 arch/arm/mach-s3c64xx/watchdog-reset.h
delete mode 100644 arch/arm/plat-samsung/watchdog-reset.c

diff --git a/arch/arm/mach-s3c64xx/Kconfig b/arch/arm/mach-s3c64xx/Kconfig
index e208c2b48853..f3fcb570edf5 100644
--- a/arch/arm/mach-s3c64xx/Kconfig
+++ b/arch/arm/mach-s3c64xx/Kconfig
@@ -18,9 +18,10 @@ menuconfig ARCH_S3C64XX
select PM_GENERIC_DOMAINS if PM
select S3C_DEV_NAND if ATAGS
select S3C_GPIO_TRACK if ATAGS
+ select S3C2410_WATCHDOG
select SAMSUNG_ATAGS if ATAGS
select SAMSUNG_WAKEMASK if PM
- select SAMSUNG_WDT_RESET
+ select WATCHDOG
help
Samsung S3C64XX series based systems

diff --git a/arch/arm/mach-s3c64xx/common.c b/arch/arm/mach-s3c64xx/common.c
index a655bf0c7802..42e96d196f61 100644
--- a/arch/arm/mach-s3c64xx/common.c
+++ b/arch/arm/mach-s3c64xx/common.c
@@ -50,7 +50,6 @@

#include "common.h"
#include "irq-uart.h"
-#include "watchdog-reset.h"

/* External clock frequency */
static unsigned long xtal_f __ro_after_init = 12000000;
@@ -232,10 +231,11 @@ void __init s3c64xx_init_irq(u32 vic0_valid, u32 vic1_valid)
/*
* FIXME: there is no better place to put this at the moment
* (s3c64xx_clk_init needs ioremap and must happen before init_time
- * samsung_wdt_reset_init needs clocks)
+ * samsung_wdt_reset_init needs clocks). However
+ * samsung_wdt_reset_init() was removed in favor of watchdog driver
+ * so this should be revised.
*/
s3c64xx_clk_init(NULL, xtal_f, xusbxti_f, soc_is_s3c6400(), S3C_VA_SYS);
- samsung_wdt_reset_init(S3C_VA_WATCHDOG);

printk(KERN_DEBUG "%s: initialising interrupts\n", __func__);

@@ -429,12 +429,3 @@ static int __init s3c64xx_init_irq_eint(void)
return 0;
}
arch_initcall(s3c64xx_init_irq_eint);
-
-void s3c64xx_restart(enum reboot_mode mode, const char *cmd)
-{
- if (mode != REBOOT_SOFT)
- samsung_wdt_reset();
-
- /* if all else fails, or mode was for soft, jump to 0 */
- soft_restart(0);
-}
diff --git a/arch/arm/mach-s3c64xx/common.h b/arch/arm/mach-s3c64xx/common.h
index 6fcfb0e0ffa5..567bf3017171 100644
--- a/arch/arm/mach-s3c64xx/common.h
+++ b/arch/arm/mach-s3c64xx/common.h
@@ -19,8 +19,6 @@
void s3c64xx_init_irq(u32 vic0, u32 vic1);
void s3c64xx_init_io(struct map_desc *mach_desc, int size);

-void s3c64xx_restart(enum reboot_mode mode, const char *cmd);
-
struct device_node;
void s3c64xx_set_xtal_freq(unsigned long freq);
void s3c64xx_set_xusbxti_freq(unsigned long freq);
diff --git a/arch/arm/mach-s3c64xx/mach-anw6410.c b/arch/arm/mach-s3c64xx/mach-anw6410.c
index 495549573d36..e783f5b3593a 100644
--- a/arch/arm/mach-s3c64xx/mach-anw6410.c
+++ b/arch/arm/mach-s3c64xx/mach-anw6410.c
@@ -228,5 +228,4 @@ MACHINE_START(ANW6410, "A&W6410")
.map_io = anw6410_map_io,
.init_machine = anw6410_machine_init,
.init_time = samsung_timer_init,
- .restart = s3c64xx_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/mach-crag6410.c b/arch/arm/mach-s3c64xx/mach-crag6410.c
index 3cb43a33e3f8..223a3d51d8b6 100644
--- a/arch/arm/mach-s3c64xx/mach-crag6410.c
+++ b/arch/arm/mach-s3c64xx/mach-crag6410.c
@@ -877,5 +877,4 @@ MACHINE_START(WLF_CRAGG_6410, "Wolfson Cragganmore 6410")
.map_io = crag6410_map_io,
.init_machine = crag6410_machine_init,
.init_time = samsung_timer_init,
- .restart = s3c64xx_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/mach-hmt.c b/arch/arm/mach-s3c64xx/mach-hmt.c
index cadb63103517..ad15260c12b4 100644
--- a/arch/arm/mach-s3c64xx/mach-hmt.c
+++ b/arch/arm/mach-s3c64xx/mach-hmt.c
@@ -280,5 +280,4 @@ MACHINE_START(HMT, "Airgoo-HMT")
.map_io = hmt_map_io,
.init_machine = hmt_machine_init,
.init_time = samsung_timer_init,
- .restart = s3c64xx_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/mach-mini6410.c b/arch/arm/mach-s3c64xx/mach-mini6410.c
index 77bad2891020..636d312add81 100644
--- a/arch/arm/mach-s3c64xx/mach-mini6410.c
+++ b/arch/arm/mach-s3c64xx/mach-mini6410.c
@@ -362,5 +362,4 @@ MACHINE_START(MINI6410, "MINI6410")
.map_io = mini6410_map_io,
.init_machine = mini6410_machine_init,
.init_time = samsung_timer_init,
- .restart = s3c64xx_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/mach-ncp.c b/arch/arm/mach-s3c64xx/mach-ncp.c
index a7c328d32824..0a67ff173575 100644
--- a/arch/arm/mach-s3c64xx/mach-ncp.c
+++ b/arch/arm/mach-s3c64xx/mach-ncp.c
@@ -98,5 +98,4 @@ MACHINE_START(NCP, "NCP")
.map_io = ncp_map_io,
.init_machine = ncp_machine_init,
.init_time = samsung_timer_init,
- .restart = s3c64xx_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/mach-real6410.c b/arch/arm/mach-s3c64xx/mach-real6410.c
index 993ce7bdd740..56fc21f02c7b 100644
--- a/arch/arm/mach-s3c64xx/mach-real6410.c
+++ b/arch/arm/mach-s3c64xx/mach-real6410.c
@@ -330,5 +330,4 @@ MACHINE_START(REAL6410, "REAL6410")
.map_io = real6410_map_io,
.init_machine = real6410_machine_init,
.init_time = samsung_timer_init,
- .restart = s3c64xx_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/mach-s3c64xx-dt.c b/arch/arm/mach-s3c64xx/mach-s3c64xx-dt.c
index 1724f5ea5c46..09c4e8742629 100644
--- a/arch/arm/mach-s3c64xx/mach-s3c64xx-dt.c
+++ b/arch/arm/mach-s3c64xx/mach-s3c64xx-dt.c
@@ -12,7 +12,6 @@
#include <mach/map.h>

#include "common.h"
-#include "watchdog-reset.h"

/*
* IO mapping for shared system controller IP.
@@ -39,20 +38,6 @@ static void __init s3c64xx_dt_map_io(void)
panic("SoC is not S3C64xx!");
}

-static void __init s3c64xx_dt_init_machine(void)
-{
- samsung_wdt_reset_of_init();
-}
-
-static void s3c64xx_dt_restart(enum reboot_mode mode, const char *cmd)
-{
- if (mode != REBOOT_SOFT)
- samsung_wdt_reset();
-
- /* if all else fails, or mode was for soft, jump to 0 */
- soft_restart(0);
-}
-
static const char *const s3c64xx_dt_compat[] __initconst = {
"samsung,s3c6400",
"samsung,s3c6410",
@@ -63,6 +48,4 @@ DT_MACHINE_START(S3C6400_DT, "Samsung S3C64xx (Flattened Device Tree)")
/* Maintainer: Tomasz Figa <tomasz.figa@gmail.com> */
.dt_compat = s3c64xx_dt_compat,
.map_io = s3c64xx_dt_map_io,
- .init_machine = s3c64xx_dt_init_machine,
- .restart = s3c64xx_dt_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/mach-smartq5.c b/arch/arm/mach-s3c64xx/mach-smartq5.c
index c1d173a97f2a..789876a20534 100644
--- a/arch/arm/mach-s3c64xx/mach-smartq5.c
+++ b/arch/arm/mach-s3c64xx/mach-smartq5.c
@@ -151,5 +151,4 @@ MACHINE_START(SMARTQ5, "SmartQ 5")
.map_io = smartq_map_io,
.init_machine = smartq5_machine_init,
.init_time = samsung_timer_init,
- .restart = s3c64xx_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/mach-smartq7.c b/arch/arm/mach-s3c64xx/mach-smartq7.c
index 493fd8cd83eb..d004e34b63bb 100644
--- a/arch/arm/mach-s3c64xx/mach-smartq7.c
+++ b/arch/arm/mach-s3c64xx/mach-smartq7.c
@@ -167,5 +167,4 @@ MACHINE_START(SMARTQ7, "SmartQ 7")
.map_io = smartq_map_io,
.init_machine = smartq7_machine_init,
.init_time = samsung_timer_init,
- .restart = s3c64xx_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/mach-smdk6400.c b/arch/arm/mach-s3c64xx/mach-smdk6400.c
index 76b676b6acbb..d24899dd3883 100644
--- a/arch/arm/mach-s3c64xx/mach-smdk6400.c
+++ b/arch/arm/mach-s3c64xx/mach-smdk6400.c
@@ -88,5 +88,4 @@ MACHINE_START(SMDK6400, "SMDK6400")
.map_io = smdk6400_map_io,
.init_machine = smdk6400_machine_init,
.init_time = samsung_timer_init,
- .restart = s3c64xx_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/mach-smdk6410.c b/arch/arm/mach-s3c64xx/mach-smdk6410.c
index 3bd13701d01c..104548fb192a 100644
--- a/arch/arm/mach-s3c64xx/mach-smdk6410.c
+++ b/arch/arm/mach-s3c64xx/mach-smdk6410.c
@@ -704,5 +704,4 @@ MACHINE_START(SMDK6410, "SMDK6410")
.map_io = smdk6410_map_io,
.init_machine = smdk6410_machine_init,
.init_time = samsung_timer_init,
- .restart = s3c64xx_restart,
MACHINE_END
diff --git a/arch/arm/mach-s3c64xx/watchdog-reset.h b/arch/arm/mach-s3c64xx/watchdog-reset.h
deleted file mode 100644
index 1042d6c463dc..000000000000
--- a/arch/arm/mach-s3c64xx/watchdog-reset.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (c) 2008 Simtec Electronics
- * Ben Dooks <ben@simtec.co.uk>
- *
- * S3C2410 - System define for arch_reset() function
- */
-
-#ifndef __PLAT_SAMSUNG_WATCHDOG_RESET_H
-#define __PLAT_SAMSUNG_WATCHDOG_RESET_H
-
-extern void samsung_wdt_reset(void);
-extern void samsung_wdt_reset_of_init(void);
-extern void samsung_wdt_reset_init(void __iomem *base);
-
-#endif /* __PLAT_SAMSUNG_WATCHDOG_RESET_H */
diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
index 43a8b2bd16ff..3aca01067b3c 100644
--- a/arch/arm/plat-samsung/Kconfig
+++ b/arch/arm/plat-samsung/Kconfig
@@ -290,12 +290,6 @@ config SAMSUNG_WAKEMASK
and above. This code allows a set of interrupt to wakeup-mask
mappings. See <plat/wakeup-mask.h>

-config SAMSUNG_WDT_RESET
- bool
- help
- Compile support for system restart by triggering watchdog reset.
- Used on SoCs that do not provide dedicated reset control.
-
config DEBUG_S3C_UART
depends on PLAT_SAMSUNG
int
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index 3db9d2c38258..ce339a96fbf7 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -32,4 +32,3 @@ obj-$(CONFIG_SAMSUNG_PM_CHECK) += pm-check.o
obj-$(CONFIG_SAMSUNG_PM_DEBUG) += pm-debug.o

obj-$(CONFIG_SAMSUNG_WAKEMASK) += wakeup-mask.o
-obj-$(CONFIG_SAMSUNG_WDT_RESET) += watchdog-reset.o
diff --git a/arch/arm/plat-samsung/watchdog-reset.c b/arch/arm/plat-samsung/watchdog-reset.c
deleted file mode 100644
index 71d85ff323f7..000000000000
--- a/arch/arm/plat-samsung/watchdog-reset.c
+++ /dev/null
@@ -1,93 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-//
-// Copyright (c) 2008 Simtec Electronics
-// Ben Dooks <ben@simtec.co.uk>
-//
-// Copyright (c) 2013 Tomasz Figa <tomasz.figa@gmail.com>
-//
-// Watchdog reset support for Samsung SoCs.
-
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/delay.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-
-#define S3C2410_WTCON 0x00
-#define S3C2410_WTDAT 0x04
-#define S3C2410_WTCNT 0x08
-
-#define S3C2410_WTCON_ENABLE (1 << 5)
-#define S3C2410_WTCON_DIV16 (0 << 3)
-#define S3C2410_WTCON_RSTEN (1 << 0)
-#define S3C2410_WTCON_PRESCALE(x) ((x) << 8)
-
-static void __iomem *wdt_base;
-static struct clk *wdt_clock;
-
-void samsung_wdt_reset(void)
-{
- if (!wdt_base) {
- pr_err("%s: wdt reset not initialized\n", __func__);
- /* delay to allow the serial port to show the message */
- mdelay(50);
- return;
- }
-
- if (!IS_ERR(wdt_clock))
- clk_prepare_enable(wdt_clock);
-
- /* disable watchdog, to be safe */
- __raw_writel(0, wdt_base + S3C2410_WTCON);
-
- /* put initial values into count and data */
- __raw_writel(0x80, wdt_base + S3C2410_WTCNT);
- __raw_writel(0x80, wdt_base + S3C2410_WTDAT);
-
- /* set the watchdog to go and reset... */
- __raw_writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV16 |
- S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x20),
- wdt_base + S3C2410_WTCON);
-
- /* wait for reset to assert... */
- mdelay(500);
-
- pr_err("Watchdog reset failed to assert reset\n");
-
- /* delay to allow the serial port to show the message */
- mdelay(50);
-}
-
-#ifdef CONFIG_OF
-static const struct of_device_id s3c2410_wdt_match[] = {
- { .compatible = "samsung,s3c2410-wdt" },
- { .compatible = "samsung,s3c6410-wdt" },
- {},
-};
-
-void __init samsung_wdt_reset_of_init(void)
-{
- struct device_node *np;
-
- np = of_find_matching_node(NULL, s3c2410_wdt_match);
- if (!np) {
- pr_err("%s: failed to find watchdog node\n", __func__);
- return;
- }
-
- wdt_base = of_iomap(np, 0);
- if (!wdt_base) {
- pr_err("%s: failed to map watchdog registers\n", __func__);
- return;
- }
-
- wdt_clock = of_clk_get(np, 0);
-}
-#endif
-
-void __init samsung_wdt_reset_init(void __iomem *base)
-{
- wdt_base = base;
- wdt_clock = clk_get(NULL, "watchdog");
-}
--
2.17.1