From patchwork Tue Apr 19 16:37:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 564762 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24D3AC433F5 for ; Tue, 19 Apr 2022 16:43:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234476AbiDSQp4 (ORCPT ); Tue, 19 Apr 2022 12:45:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52812 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354977AbiDSQmt (ORCPT ); Tue, 19 Apr 2022 12:42:49 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4AC9BE03D; Tue, 19 Apr 2022 09:40:05 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 09998B81BEF; Tue, 19 Apr 2022 16:40:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E0A57C385B0; Tue, 19 Apr 2022 16:39:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1650386402; bh=Fa4t+DkHHVinGTfyny9fnUHb+3BmvDV9Sv/bDUMb99g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=j/NCSeP8NzRWUw8W6MpOSbmGTBu7/2YhXCemKDewCPqMH6cwTZLL/oiGN4LpCoujp 1SH3dQdFs3D3xtEm0/2uHyHJF7ZmzaRFqw8BaYDXyP6SWjgPPzn/jAQpcq4C1TNBpv thu2mXNQ6U7As7UR42IeQ64eiqae7mP2OoMLr4aAsZgj/eIm4qTKBztmk5D4dhw3th zON/5Z8YRyAnPU6fpP3DtJeivcDYlhBEyShGPle3yivs+DidLS4qH4YNZZ6eCXuSjQ NN99Z6FWIFBg8B1PRrkV9Ov79jsTc8IqXABoKaDE9bpFLy7xgW0qPIU9vBW0RFDG3G QCDqkjxI1s54w== From: Arnd Bergmann To: robert.jarzmik@free.fr, linux-arm-kernel@lists.infradead.org Cc: Arnd Bergmann , Daniel Mack , Haojian Zhuang , Marek Vasut , Philipp Zabel , Lubomir Rintel , Paul Parsons , Tomas Cech , Sergey Lapin , Thomas Bogendoerfer , Michael Turquette , Stephen Boyd , "Rafael J. Wysocki" , Viresh Kumar , Dmitry Torokhov , Ulf Hansson , Dominik Brodowski , Helge Deller , Mark Brown , Linus Walleij , linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-ide@vger.kernel.org, linux-clk@vger.kernel.org, linux-pm@vger.kernel.org, linux-input@vger.kernel.org, patches@opensource.cirrus.com, linux-leds@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mtd@lists.infradead.org, linux-rtc@vger.kernel.org, linux-usb@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, alsa-devel@alsa-project.org, Wim Van Sebroeck , Guenter Roeck , linux-watchdog@vger.kernel.org Subject: [PATCH 09/48] watchdog: sa1100: use platform device registration Date: Tue, 19 Apr 2022 18:37:31 +0200 Message-Id: <20220419163810.2118169-10-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20220419163810.2118169-1-arnd@kernel.org> References: <20220419163810.2118169-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org From: Arnd Bergmann Rather than relying on machine specific headers to pass down the reboot status and the register locations, use resources and platform_data. Aside from this, keep the changes to a minimum. Cc: Wim Van Sebroeck Cc: Guenter Roeck Cc: linux-watchdog@vger.kernel.org Signed-off-by: Arnd Bergmann --- arch/arm/mach-pxa/devices.c | 11 +++ arch/arm/mach-pxa/include/mach/regs-ost.h | 2 + arch/arm/mach-pxa/include/mach/reset.h | 2 +- arch/arm/mach-pxa/pxa25x.c | 2 +- arch/arm/mach-pxa/pxa27x.c | 2 +- arch/arm/mach-pxa/pxa3xx.c | 2 +- arch/arm/mach-pxa/reset.c | 3 - arch/arm/mach-sa1100/generic.c | 6 +- arch/arm/mach-sa1100/include/mach/reset.h | 1 - drivers/watchdog/sa1100_wdt.c | 87 ++++++++++++++++------- 10 files changed, 83 insertions(+), 35 deletions(-) diff --git a/arch/arm/mach-pxa/devices.c b/arch/arm/mach-pxa/devices.c index 454523237c97..12f78636045f 100644 --- a/arch/arm/mach-pxa/devices.c +++ b/arch/arm/mach-pxa/devices.c @@ -24,6 +24,8 @@ #include #include +#include +#include #include "devices.h" #include "generic.h" @@ -1118,3 +1120,12 @@ void __init pxa2xx_set_dmac_info(struct mmp_dma_platdata *dma_pdata) { pxa_register_device(&pxa2xx_pxa_dma, dma_pdata); } + +void __init pxa_register_wdt(unsigned int reset_status) +{ + struct resource res = DEFINE_RES_MEM(OST_PHYS, OST_LEN); + + reset_status &= RESET_STATUS_WATCHDOG; + platform_device_register_resndata(NULL, "sa1100_wdt", -1, &res, 1, + &reset_status, sizeof(reset_status)); +} diff --git a/arch/arm/mach-pxa/include/mach/regs-ost.h b/arch/arm/mach-pxa/include/mach/regs-ost.h index 109d0ed264df..c8001cfc8d6b 100644 --- a/arch/arm/mach-pxa/include/mach/regs-ost.h +++ b/arch/arm/mach-pxa/include/mach/regs-ost.h @@ -7,6 +7,8 @@ /* * OS Timer & Match Registers */ +#define OST_PHYS 0x40A00000 +#define OST_LEN 0x00000020 #define OSMR0 io_p2v(0x40A00000) /* */ #define OSMR1 io_p2v(0x40A00004) /* */ diff --git a/arch/arm/mach-pxa/include/mach/reset.h b/arch/arm/mach-pxa/include/mach/reset.h index e1c4d100fd45..963dd190bc13 100644 --- a/arch/arm/mach-pxa/include/mach/reset.h +++ b/arch/arm/mach-pxa/include/mach/reset.h @@ -8,8 +8,8 @@ #define RESET_STATUS_GPIO (1 << 3) /* GPIO Reset */ #define RESET_STATUS_ALL (0xf) -extern unsigned int reset_status; extern void clear_reset_status(unsigned int mask); +extern void pxa_register_wdt(unsigned int reset_status); /** * init_gpio_reset() - register GPIO as reset generator diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c index 305047ebd2f1..dfc90b41fba3 100644 --- a/arch/arm/mach-pxa/pxa25x.c +++ b/arch/arm/mach-pxa/pxa25x.c @@ -240,7 +240,7 @@ static int __init pxa25x_init(void) if (cpu_is_pxa25x()) { - reset_status = RCSR; + pxa_register_wdt(RCSR); pxa25x_init_pm(); diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c index a81ac88ecbfd..38fdd22c4dc5 100644 --- a/arch/arm/mach-pxa/pxa27x.c +++ b/arch/arm/mach-pxa/pxa27x.c @@ -337,7 +337,7 @@ static int __init pxa27x_init(void) if (cpu_is_pxa27x()) { - reset_status = RCSR; + pxa_register_wdt(RCSR); pxa27x_init_pm(); diff --git a/arch/arm/mach-pxa/pxa3xx.c b/arch/arm/mach-pxa/pxa3xx.c index fc84aed99481..7c569fa2a6da 100644 --- a/arch/arm/mach-pxa/pxa3xx.c +++ b/arch/arm/mach-pxa/pxa3xx.c @@ -463,7 +463,7 @@ static int __init pxa3xx_init(void) if (cpu_is_pxa3xx()) { - reset_status = ARSR; + pxa_register_wdt(ARSR); /* * clear RDH bit every time after reset diff --git a/arch/arm/mach-pxa/reset.c b/arch/arm/mach-pxa/reset.c index af78405aa4e9..fcb791c5ae3e 100644 --- a/arch/arm/mach-pxa/reset.c +++ b/arch/arm/mach-pxa/reset.c @@ -11,9 +11,6 @@ #include #include -unsigned int reset_status; -EXPORT_SYMBOL(reset_status); - static void do_hw_reset(void); static int reset_gpio = -1; diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c index 4dfb7554649d..6c21f214cd60 100644 --- a/arch/arm/mach-sa1100/generic.c +++ b/arch/arm/mach-sa1100/generic.c @@ -39,9 +39,6 @@ #include "generic.h" #include -unsigned int reset_status; -EXPORT_SYMBOL(reset_status); - #define NR_FREQS 16 /* @@ -319,10 +316,13 @@ static struct platform_device *sa11x0_devices[] __initdata = { static int __init sa1100_init(void) { + struct resource wdt_res = DEFINE_RES_MEM(0x90000000, 0x20); pm_power_off = sa1100_power_off; regulator_has_full_constraints(); + platform_device_register_simple("sa1100_wdt", -1, &wdt_res, 1); + return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices)); } diff --git a/arch/arm/mach-sa1100/include/mach/reset.h b/arch/arm/mach-sa1100/include/mach/reset.h index 27695650a567..a6723d45ae2a 100644 --- a/arch/arm/mach-sa1100/include/mach/reset.h +++ b/arch/arm/mach-sa1100/include/mach/reset.h @@ -10,7 +10,6 @@ #define RESET_STATUS_GPIO (1 << 3) /* GPIO Reset */ #define RESET_STATUS_ALL (0xf) -extern unsigned int reset_status; static inline void clear_reset_status(unsigned int mask) { RCSR = mask; diff --git a/drivers/watchdog/sa1100_wdt.c b/drivers/watchdog/sa1100_wdt.c index d33f0375112f..2d0a06a158a8 100644 --- a/drivers/watchdog/sa1100_wdt.c +++ b/drivers/watchdog/sa1100_wdt.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -30,16 +31,42 @@ #include #include -#ifdef CONFIG_ARCH_PXA -#include -#endif +#define REG_OSMR0 0x0000 /* OS timer Match Reg. 0 */ +#define REG_OSMR1 0x0004 /* OS timer Match Reg. 1 */ +#define REG_OSMR2 0x0008 /* OS timer Match Reg. 2 */ +#define REG_OSMR3 0x000c /* OS timer Match Reg. 3 */ +#define REG_OSCR 0x0010 /* OS timer Counter Reg. */ +#define REG_OSSR 0x0014 /* OS timer Status Reg. */ +#define REG_OWER 0x0018 /* OS timer Watch-dog Enable Reg. */ +#define REG_OIER 0x001C /* OS timer Interrupt Enable Reg. */ -#include +#define OSSR_M3 (1 << 3) /* Match status channel 3 */ +#define OSSR_M2 (1 << 2) /* Match status channel 2 */ +#define OSSR_M1 (1 << 1) /* Match status channel 1 */ +#define OSSR_M0 (1 << 0) /* Match status channel 0 */ + +#define OWER_WME (1 << 0) /* Watchdog Match Enable */ + +#define OIER_E3 (1 << 3) /* Interrupt enable channel 3 */ +#define OIER_E2 (1 << 2) /* Interrupt enable channel 2 */ +#define OIER_E1 (1 << 1) /* Interrupt enable channel 1 */ +#define OIER_E0 (1 << 0) /* Interrupt enable channel 0 */ static unsigned long oscr_freq; static unsigned long sa1100wdt_users; static unsigned int pre_margin; static int boot_status; +static void __iomem *reg_base; + +static inline void sa1100_wr(u32 val, u32 offset) +{ + writel_relaxed(val, reg_base + offset); +} + +static inline u32 sa1100_rd(u32 offset) +{ + return readl_relaxed(reg_base + offset); +} /* * Allow only one person to hold it open @@ -50,10 +77,10 @@ static int sa1100dog_open(struct inode *inode, struct file *file) return -EBUSY; /* Activate SA1100 Watchdog timer */ - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); - writel_relaxed(OSSR_M3, OSSR); - writel_relaxed(OWER_WME, OWER); - writel_relaxed(readl_relaxed(OIER) | OIER_E3, OIER); + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); + sa1100_wr(OSSR_M3, REG_OSSR); + sa1100_wr(OWER_WME, REG_OWER); + sa1100_wr(sa1100_rd(REG_OIER) | OIER_E3, REG_OIER); return stream_open(inode, file); } @@ -61,7 +88,7 @@ static int sa1100dog_open(struct inode *inode, struct file *file) * The watchdog cannot be disabled. * * Previous comments suggested that turning off the interrupt by - * clearing OIER[E3] would prevent the watchdog timing out but this + * clearing REG_OIER[E3] would prevent the watchdog timing out but this * does not appear to be true (at least on the PXA255). */ static int sa1100dog_release(struct inode *inode, struct file *file) @@ -76,7 +103,7 @@ static ssize_t sa1100dog_write(struct file *file, const char __user *data, { if (len) /* Refresh OSMR3 timer. */ - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); return len; } @@ -110,7 +137,7 @@ static long sa1100dog_ioctl(struct file *file, unsigned int cmd, break; case WDIOC_KEEPALIVE: - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); ret = 0; break; @@ -125,7 +152,7 @@ static long sa1100dog_ioctl(struct file *file, unsigned int cmd, } pre_margin = oscr_freq * time; - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); fallthrough; case WDIOC_GETTIMEOUT: @@ -151,12 +178,22 @@ static struct miscdevice sa1100dog_miscdev = { .fops = &sa1100dog_fops, }; -static int margin __initdata = 60; /* (secs) Default is 1 minute */ +static int margin = 60; /* (secs) Default is 1 minute */ static struct clk *clk; -static int __init sa1100dog_init(void) +static int sa1100dog_probe(struct platform_device *pdev) { int ret; + int *platform_data; + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENXIO; + reg_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + ret = PTR_ERR_OR_ZERO(reg_base); + if (ret) + return ret; clk = clk_get(NULL, "OSTIMER0"); if (IS_ERR(clk)) { @@ -174,13 +211,9 @@ static int __init sa1100dog_init(void) oscr_freq = clk_get_rate(clk); - /* - * Read the reset status, and save it for later. If - * we suspend, RCSR will be cleared, and the watchdog - * reset reason will be lost. - */ - boot_status = (reset_status & RESET_STATUS_WATCHDOG) ? - WDIOF_CARDRESET : 0; + platform_data = pdev->dev.platform_data; + if (platform_data && *platform_data) + boot_status = WDIOF_CARDRESET; pre_margin = oscr_freq * margin; ret = misc_register(&sa1100dog_miscdev); @@ -196,15 +229,21 @@ static int __init sa1100dog_init(void) return ret; } -static void __exit sa1100dog_exit(void) +static int sa1100dog_remove(struct platform_device *pdev) { misc_deregister(&sa1100dog_miscdev); clk_disable_unprepare(clk); clk_put(clk); + + return 0; } -module_init(sa1100dog_init); -module_exit(sa1100dog_exit); +struct platform_driver sa1100dog_driver = { + .driver.name = "sa1100_wdt", + .probe = sa1100dog_probe, + .remove = sa1100dog_remove, +}; +module_platform_driver(sa1100dog_driver); MODULE_AUTHOR("Oleg Drokin "); MODULE_DESCRIPTION("SA1100/PXA2xx Watchdog");