From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from ns.lynxeye.de ([87.118.118.114] helo=lynxeye.de) by casper.infradead.org with esmtp (Exim 4.89 #1 (Red Hat Linux)) id 1ejAYK-0004pP-3Y for barebox@lists.infradead.org; Tue, 06 Feb 2018 21:13:23 +0000 Received: from tellur.fritz.box (a89-183-13-207.net-htp.de [89.183.13.207]) by lynxeye.de (Postfix) with ESMTPA id BE0BBE7414D for ; Tue, 6 Feb 2018 22:11:19 +0100 (CET) From: Lucas Stach Date: Tue, 6 Feb 2018 22:11:14 +0100 Message-Id: <20180206211115.25178-1-l.stach@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 1/2] watchdog: implement bcm2835 watchdog To: barebox@lists.infradead.org Move out of architecture code and add some real watchdog functionality. Signed-off-by: Lucas Stach --- arch/arm/mach-bcm283x/Makefile | 2 +- arch/arm/mach-bcm283x/include/mach/wd.h | 47 ----------- arch/arm/mach-bcm283x/wd.c | 75 ----------------- drivers/watchdog/Kconfig | 6 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/bcm2835_wdt.c | 141 ++++++++++++++++++++++++++++++++ 6 files changed, 149 insertions(+), 123 deletions(-) delete mode 100644 arch/arm/mach-bcm283x/include/mach/wd.h delete mode 100644 arch/arm/mach-bcm283x/wd.c create mode 100644 drivers/watchdog/bcm2835_wdt.c diff --git a/arch/arm/mach-bcm283x/Makefile b/arch/arm/mach-bcm283x/Makefile index 96ea69365..940f98cbc 100644 --- a/arch/arm/mach-bcm283x/Makefile +++ b/arch/arm/mach-bcm283x/Makefile @@ -1 +1 @@ -obj-y += core.o mbox.o wd.o +obj-y += core.o mbox.o diff --git a/arch/arm/mach-bcm283x/include/mach/wd.h b/arch/arm/mach-bcm283x/include/mach/wd.h deleted file mode 100644 index cdd22d48c..000000000 --- a/arch/arm/mach-bcm283x/include/mach/wd.h +++ /dev/null @@ -1,47 +0,0 @@ -/* - * Extract from arch/arm/mach-bcm2708/include/mach/platform.h - * - * Copyright (C) 2010 Broadcom - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - */ - -#ifndef _WD_H -#define _WD_H - -/* - * Watchdog - */ -#define PM_RSTC 0x1c -#define PM_RSTS 0x20 -#define PM_WDOG 0x24 - -#define PM_WDOG_RESET 0000000000 -#define PM_PASSWORD 0x5a000000 -#define PM_WDOG_TIME_SET 0x000fffff -#define PM_RSTC_WRCFG_CLR 0xffffffcf -#define PM_RSTC_WRCFG_SET 0x00000030 -#define PM_RSTC_WRCFG_FULL_RESET 0x00000020 -#define PM_RSTC_RESET 0x00000102 - -#define PM_RSTS_HADPOR_SET 0x00001000 -#define PM_RSTS_HADSRH_SET 0x00000400 -#define PM_RSTS_HADSRF_SET 0x00000200 -#define PM_RSTS_HADSRQ_SET 0x00000100 -#define PM_RSTS_HADWRH_SET 0x00000040 -#define PM_RSTS_HADWRF_SET 0x00000020 -#define PM_RSTS_HADWRQ_SET 0x00000010 -#define PM_RSTS_HADDRH_SET 0x00000004 -#define PM_RSTS_HADDRF_SET 0x00000002 -#define PM_RSTS_HADDRQ_SET 0x00000001 - -#endif diff --git a/arch/arm/mach-bcm283x/wd.c b/arch/arm/mach-bcm283x/wd.c deleted file mode 100644 index 5a5188fd2..000000000 --- a/arch/arm/mach-bcm283x/wd.c +++ /dev/null @@ -1,75 +0,0 @@ -/* - * Copyright (C) 2017 Pengutronix, Lucas Stach - * - * Based on code from Carlo Caione - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - */ -#include -#include -#include -#include - -#include - -static void __iomem *wd_base; - -#define RESET_TIMEOUT 10 - -static void __noreturn bcm2835_restart_soc(struct restart_handler *rst) -{ - uint32_t rstc; - - rstc = readl(wd_base + PM_RSTC); - rstc &= ~PM_RSTC_WRCFG_SET; - rstc |= PM_RSTC_WRCFG_FULL_RESET; - writel(PM_PASSWORD | RESET_TIMEOUT, wd_base + PM_WDOG); - writel(PM_PASSWORD | rstc, wd_base + PM_RSTC); - - hang(); -} - -static int bcm2835_wd_probe(struct device_d *dev) -{ - struct resource *iores; - - iores = dev_request_mem_resource(dev, 0); - if (IS_ERR(iores)) { - dev_err(dev, "could not get memory region\n"); - return PTR_ERR(iores); - } - wd_base = IOMEM(iores->start); - - restart_handler_register_fn(bcm2835_restart_soc); - - return 0; -} - -static __maybe_unused struct of_device_id bcm2835_wd_dt_ids[] = { - { - .compatible = "brcm,bcm2835-pm-wdt", - }, { - /* sentinel */ - }, -}; - -static struct driver_d bcm2835_wd_driver = { - .name = "bcm2835_wd", - .of_compatible = DRV_OF_COMPAT(bcm2835_wd_dt_ids), - .probe = bcm2835_wd_probe, -}; - -static int __init bcm2835_wd_init(void) -{ - return platform_driver_register(&bcm2835_wd_driver); -} -device_initcall(bcm2835_wd_init); diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index a8f9492ac..3defb9da6 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -58,4 +58,10 @@ config WATCHDOG_ORION help Add support for watchdog on the Marvall Armada XP +config WATCHDOG_BCM2835 + bool "Watchdog for BCM283x SoCs" + depends on ARCH_BCM283X + help + Add support for watchdog on the Broadcom BCM283X SoCs. + endif diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index c607f7509..237640121 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -7,3 +7,4 @@ obj-$(CONFIG_WATCHDOG_DW) += dw_wdt.o obj-$(CONFIG_WATCHDOG_JZ4740) += jz4740.o obj-$(CONFIG_WATCHDOG_IMX_RESET_SOURCE) += imxwd.o obj-$(CONFIG_WATCHDOG_ORION) += orion_wdt.o +obj-$(CONFIG_ARCH_BCM283X) += bcm2835_wdt.o diff --git a/drivers/watchdog/bcm2835_wdt.c b/drivers/watchdog/bcm2835_wdt.c new file mode 100644 index 000000000..457d86fc0 --- /dev/null +++ b/drivers/watchdog/bcm2835_wdt.c @@ -0,0 +1,141 @@ +/* + * Copyright (C) 2017 Pengutronix, Lucas Stach + * + * Based on code from Carlo Caione + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include +#include +#include +#include +#include + +#define PM_RSTC 0x1c +#define PM_RSTS 0x20 +#define PM_WDOG 0x24 + +#define PM_WDOG_RESET 0000000000 +#define PM_PASSWORD 0x5a000000 +#define PM_WDOG_TIME_SET 0x000fffff +#define PM_RSTC_WRCFG_CLR 0xffffffcf +#define PM_RSTC_WRCFG_SET 0x00000030 +#define PM_RSTC_WRCFG_FULL_RESET 0x00000020 +#define PM_RSTC_RESET 0x00000102 + +#define PM_RSTS_HADPOR_SET 0x00001000 +#define PM_RSTS_HADSRH_SET 0x00000400 +#define PM_RSTS_HADSRF_SET 0x00000200 +#define PM_RSTS_HADSRQ_SET 0x00000100 +#define PM_RSTS_HADWRH_SET 0x00000040 +#define PM_RSTS_HADWRF_SET 0x00000020 +#define PM_RSTS_HADWRQ_SET 0x00000010 +#define PM_RSTS_HADDRH_SET 0x00000004 +#define PM_RSTS_HADDRF_SET 0x00000002 +#define PM_RSTS_HADDRQ_SET 0x00000001 + +#define SECS_TO_WDOG_TICKS(x) ((x) << 16) + +struct bcm2835_wd { + struct watchdog wd; + void __iomem *base; + struct device_d *dev; + struct restart_handler restart; +}; + +#define RESET_TIMEOUT 10 + +static void __noreturn bcm2835_restart_soc(struct restart_handler *rst) +{ + struct bcm2835_wd *priv = container_of(rst, struct bcm2835_wd, restart); + uint32_t rstc; + + rstc = readl(priv->base + PM_RSTC); + rstc &= ~PM_RSTC_WRCFG_SET; + rstc |= PM_RSTC_WRCFG_FULL_RESET; + writel(PM_PASSWORD | RESET_TIMEOUT, priv->base + PM_WDOG); + writel(PM_PASSWORD | rstc, priv->base + PM_RSTC); + + hang(); +} + +static int bcm2835_wd_set_timeout(struct watchdog *wd, unsigned timeout) +{ + struct bcm2835_wd *priv = container_of(wd, struct bcm2835_wd, wd); + u32 val; + + if (!timeout) { + writel(PM_PASSWORD | PM_RSTC_RESET, priv->base + PM_RSTC); + return 0; + } + + writel(PM_PASSWORD | (SECS_TO_WDOG_TICKS(timeout) & PM_WDOG_TIME_SET), + priv->base + PM_WDOG); + val = readl(priv->base + PM_RSTC); + writel(PM_PASSWORD | (val & PM_RSTC_WRCFG_CLR) | + PM_RSTC_WRCFG_FULL_RESET, priv->base + PM_RSTC); + + return 0; +} + +static int bcm2835_wd_probe(struct device_d *dev) +{ + struct resource *iores; + struct bcm2835_wd *priv; + int ret; + + priv = xzalloc(sizeof(*priv)); + iores = dev_request_mem_resource(dev, 0); + if (IS_ERR(iores)) { + dev_err(dev, "could not get memory region\n"); + return PTR_ERR(iores); + } + priv->base = IOMEM(iores->start); + priv->wd.set_timeout = bcm2835_wd_set_timeout; + priv->wd.dev = dev; + priv->dev = dev; + + if (IS_ENABLED(CONFIG_WATCHDOG_BCM2835)) { + ret = watchdog_register(&priv->wd); + if (ret) { + free(priv); + return ret; + } + } + + priv->restart.name = "bcm2835_wd"; + priv->restart.restart = bcm2835_restart_soc; + + restart_handler_register(&priv->restart); + + return 0; +} + +static __maybe_unused struct of_device_id bcm2835_wd_dt_ids[] = { + { + .compatible = "brcm,bcm2835-pm-wdt", + }, { + /* sentinel */ + }, +}; + +static struct driver_d bcm2835_wd_driver = { + .name = "bcm2835_wd", + .of_compatible = DRV_OF_COMPAT(bcm2835_wd_dt_ids), + .probe = bcm2835_wd_probe, +}; + +static int __init bcm2835_wd_init(void) +{ + return platform_driver_register(&bcm2835_wd_driver); +} +device_initcall(bcm2835_wd_init); -- 2.14.3 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox