From patchwork Tue Aug 4 19:26:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 11700841 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E0742138A for ; Tue, 4 Aug 2020 19:28:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D98BB22CB1 for ; Tue, 4 Aug 2020 19:28:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596569285; bh=jHU1RBVm0WqvZsCowGFRQGPvTtPcfYKwacHFFIilqw0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=bnDC6LHXz/2mjD4a5DrRNzJbVuMBweqvHRB/F91vGry3lzyoIjs46Fh6Gj/v7FBUp NeDlwor3B3QlxjRgJxTJMO/0YQ09mmYMfqYKICXTU0XNA6O4fJMrsT2uMr+mAO1Vk3 L/GJ6T9I+/wvH+HfSfbK3AOqHLWardePMoM9qAhw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728188AbgHDT2F (ORCPT ); Tue, 4 Aug 2020 15:28:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:40314 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727930AbgHDT2E (ORCPT ); Tue, 4 Aug 2020 15:28:04 -0400 Received: from localhost.localdomain (unknown [194.230.155.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7B27A22B45; Tue, 4 Aug 2020 19:27:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596569283; bh=jHU1RBVm0WqvZsCowGFRQGPvTtPcfYKwacHFFIilqw0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gsgPIIq/2qoG9XZ0oVbwG7wrgs7HPnObaJcJb80gzkCdUYSC3r1B+SLeskQygJay0 EQz4cout+DxUiYHNPn2ieEjSuzI/GJ847+iddxI3Isp6JOMhLDIfJSfowiRP+W1KdI GB9gCirLARlV/3XZaFWNkKpqVQ0ku6hUJOWaQDQU= From: Krzysztof Kozlowski To: Russell King , Kukjin Kim , Krzysztof Kozlowski , Simtec Linux Team , Maxime Coquelin , Alexandre Torgue , Kyungmin Park , Catalin Marinas , Will Deacon , Sylwester Nawrocki , Tomasz Figa , Chanwoo Choi , Michael Turquette , Stephen Boyd , Wim Van Sebroeck , Guenter Roeck , Arnd Bergmann , 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 , Marek Szyprowski , Sylwester Nawrocki , Cedric Roux , Lihua Yao Subject: [PATCH v2 07/13] ARM: s3c64xx: switch to generic watchdog driver reset Date: Tue, 4 Aug 2020 21:26:48 +0200 Message-Id: <20200804192654.12783-8-krzk@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200804192654.12783-1-krzk@kernel.org> References: <20200804192654.12783-1-krzk@kernel.org> Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.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) The generic watchdog-based system reset is not exactly the same as before. The previous method had a fallback to soft_restart() which now is gone. The commit also removes a FIXME note about calling s3c64xx_clk_init() inside s3c64xx_init_irq(). No one fixed this since long time and the note is not meaningful anymore because watchdog part is removed. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Tomasz Figa --- Changes since v1: 1. Drop FIXME note and update commit msg, after talks with Tomasz, 2. Add Tomasz's review tag. --- arch/arm/mach-s3c64xx/Kconfig | 3 +- arch/arm/mach-s3c64xx/common.c | 16 ----- 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, 2 insertions(+), 162 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..c9c20256488b 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; @@ -229,13 +228,7 @@ core_initcall(s3c64xx_dev_init); 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) - */ 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 +422,3 @@ 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 #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 */ .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 - * - * 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 -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 -// -// Copyright (c) 2013 Tomasz Figa -// -// Watchdog reset support for Samsung SoCs. - -#include -#include -#include -#include -#include -#include - -#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"); -}