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From: Krzysztof Kozlowski <krzk@kernel.org>
To: Russell King <linux@armlinux.org.uk>,
	Kukjin Kim <kgene@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Vincent Sanders <vince@simtec.co.uk>,
	Simtec Linux Team <linux@simtec.co.uk>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Sylwester Nawrocki <s.nawrocki@samsung.com>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Wim Van Sebroeck <wim@linux-watchdog.org>,
	Guenter Roeck <linux@roeck-us.net>, Arnd Bergmann <arnd@arndb.de>,
	Linus Walleij <linus.walleij@linaro.org>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	patches@opensource.cirrus.com, linux-clk@vger.kernel.org,
	linux-watchdog@vger.kernel.org
Cc: Sergio Prado <sergio.prado@e-labworks.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Sylwester Nawrocki <snawrocki@kernel.org>,
	Cedric Roux <sed@free.fr>, Lihua Yao <ylhuajnu@outlook.com>
Subject: [PATCH 6/7] ARM: s3c64xx: Switch to generic watchdog driver reset
Date: Wed, 29 Jul 2020 18:09:41 +0200
Message-ID: <20200729160942.28867-7-krzk@kernel.org> (raw)
In-Reply-To: <20200729160942.28867-1-krzk@kernel.org>

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


  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-29 16:09 [PATCH 0/7] ARM: samsung: Cleanup of various S3C bits Krzysztof Kozlowski
2020-07-29 16:09 ` [PATCH 1/7] clk: samsung: s3c64xx: Declare s3c64xx_clk_init() in shared header Krzysztof Kozlowski
2020-07-29 17:39   ` Tomasz Figa
2020-07-29 19:42   ` Stephen Boyd
2020-07-29 20:16     ` Krzysztof Kozlowski
2020-07-29 16:09 ` [PATCH 2/7] ARM: s3c64xx: Include header to fix -Wmissing-prototypes Krzysztof Kozlowski
2020-07-29 17:46   ` Tomasz Figa
2020-07-29 16:09 ` [PATCH 3/7] ARM: s3c: Remove plat-samsung/.../samsung-time.h Krzysztof Kozlowski
2020-07-29 17:49   ` Tomasz Figa
2020-07-29 19:02     ` Krzysztof Kozlowski
2020-07-29 16:09 ` [PATCH 4/7] ARM: samsung: Fix language typo Krzysztof Kozlowski
2020-07-29 16:09 ` [PATCH 5/7] ARM: samsung: Kill useless HAVE_S3C2410_WATCHDOG Krzysztof Kozlowski
2020-07-29 17:02   ` Guenter Roeck
2020-07-29 17:36     ` Tomasz Figa
2020-07-29 19:08       ` Krzysztof Kozlowski
2020-07-29 16:09 ` Krzysztof Kozlowski [this message]
2020-07-29 17:33   ` [PATCH 6/7] ARM: s3c64xx: Switch to generic watchdog driver reset Tomasz Figa
2020-07-29 19:15     ` Krzysztof Kozlowski
2020-07-29 19:25       ` Krzysztof Kozlowski
2020-07-30 11:34       ` Tomasz Figa
2020-07-30 11:45         ` Krzysztof Kozlowski
2020-07-29 16:09 ` [PATCH 7/7] ARM: s3c24xx: Fix missing system reset Krzysztof Kozlowski
2020-07-29 20:01 ` [PATCH 0/7] ARM: samsung: Cleanup of various S3C bits Arnd Bergmann
2020-07-29 20:15   ` Krzysztof Kozlowski

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