| Message ID | 20210120162745.61268-3-arnd@kernel.org (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | watchdog: remove obsolete drivers | expand |
On Wed, Jan 20, 2021 at 05:27:42PM +0100, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@arndb.de> > > The CSR SiRF prima2/atlas platforms are getting removed, so this driver > is no longer needed. > > Cc: Barry Song <baohua@kernel.org> > Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > drivers/watchdog/Kconfig | 10 -- > drivers/watchdog/Makefile | 1 - > drivers/watchdog/atlas7_wdt.c | 221 ---------------------------------- > 3 files changed, 232 deletions(-) > delete mode 100644 drivers/watchdog/atlas7_wdt.c > > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig > index 88f4827849e4..5559e4325f6a 100644 > --- a/drivers/watchdog/Kconfig > +++ b/drivers/watchdog/Kconfig > @@ -890,16 +890,6 @@ config LPC18XX_WATCHDOG > To compile this driver as a module, choose M here: the > module will be called lpc18xx_wdt. > > -config ATLAS7_WATCHDOG > - tristate "CSRatlas7 watchdog" > - depends on ARCH_ATLAS7 || COMPILE_TEST > - help > - Say Y here to include Watchdog timer support for the watchdog > - existing on the CSRatlas7 series platforms. > - > - To compile this driver as a module, choose M here: the > - module will be called atlas7_wdt. > - > config RENESAS_WDT > tristate "Renesas WDT Watchdog" > depends on ARCH_RENESAS || COMPILE_TEST > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile > index 1741ed3c6ce6..40b94403c487 100644 > --- a/drivers/watchdog/Makefile > +++ b/drivers/watchdog/Makefile > @@ -83,7 +83,6 @@ obj-$(CONFIG_MEDIATEK_WATCHDOG) += mtk_wdt.o > obj-$(CONFIG_DIGICOLOR_WATCHDOG) += digicolor_wdt.o > obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o > obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o > -obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o > obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o > obj-$(CONFIG_RENESAS_RZAWDT) += rza_wdt.o > obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o > diff --git a/drivers/watchdog/atlas7_wdt.c b/drivers/watchdog/atlas7_wdt.c > deleted file mode 100644 > index 9bfe650d802f..000000000000 > --- a/drivers/watchdog/atlas7_wdt.c > +++ /dev/null > @@ -1,221 +0,0 @@ > -// SPDX-License-Identifier: GPL-2.0-only > -/* > - * Watchdog driver for CSR Atlas7 > - * > - * Copyright (c) 2015 Cambridge Silicon Radio Limited, a CSR plc group company. > - */ > - > -#include <linux/clk.h> > -#include <linux/io.h> > -#include <linux/module.h> > -#include <linux/moduleparam.h> > -#include <linux/of.h> > -#include <linux/platform_device.h> > -#include <linux/watchdog.h> > - > -#define ATLAS7_TIMER_WDT_INDEX 5 > -#define ATLAS7_WDT_DEFAULT_TIMEOUT 20 > - > -#define ATLAS7_WDT_CNT_CTRL (0 + 4 * ATLAS7_TIMER_WDT_INDEX) > -#define ATLAS7_WDT_CNT_MATCH (0x18 + 4 * ATLAS7_TIMER_WDT_INDEX) > -#define ATLAS7_WDT_CNT (0x48 + 4 * ATLAS7_TIMER_WDT_INDEX) > -#define ATLAS7_WDT_CNT_EN (BIT(0) | BIT(1)) > -#define ATLAS7_WDT_EN 0x64 > - > -static unsigned int timeout = ATLAS7_WDT_DEFAULT_TIMEOUT; > -static bool nowayout = WATCHDOG_NOWAYOUT; > - > -module_param(timeout, uint, 0); > -module_param(nowayout, bool, 0); > - > -MODULE_PARM_DESC(timeout, "Default watchdog timeout (in seconds)"); > -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" > - __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); > - > -struct atlas7_wdog { > - struct device *dev; > - void __iomem *base; > - unsigned long tick_rate; > - struct clk *clk; > -}; > - > -static unsigned int atlas7_wdt_gettimeleft(struct watchdog_device *wdd) > -{ > - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); > - u32 counter, match, delta; > - > - counter = readl(wdt->base + ATLAS7_WDT_CNT); > - match = readl(wdt->base + ATLAS7_WDT_CNT_MATCH); > - delta = match - counter; > - > - return delta / wdt->tick_rate; > -} > - > -static int atlas7_wdt_ping(struct watchdog_device *wdd) > -{ > - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); > - u32 counter, match, delta; > - > - counter = readl(wdt->base + ATLAS7_WDT_CNT); > - delta = wdd->timeout * wdt->tick_rate; > - match = counter + delta; > - > - writel(match, wdt->base + ATLAS7_WDT_CNT_MATCH); > - > - return 0; > -} > - > -static int atlas7_wdt_enable(struct watchdog_device *wdd) > -{ > - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); > - > - atlas7_wdt_ping(wdd); > - > - writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) | ATLAS7_WDT_CNT_EN, > - wdt->base + ATLAS7_WDT_CNT_CTRL); > - writel(1, wdt->base + ATLAS7_WDT_EN); > - > - return 0; > -} > - > -static int atlas7_wdt_disable(struct watchdog_device *wdd) > -{ > - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); > - > - writel(0, wdt->base + ATLAS7_WDT_EN); > - writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) & ~ATLAS7_WDT_CNT_EN, > - wdt->base + ATLAS7_WDT_CNT_CTRL); > - > - return 0; > -} > - > -static int atlas7_wdt_settimeout(struct watchdog_device *wdd, unsigned int to) > -{ > - wdd->timeout = to; > - > - return 0; > -} > - > -#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE) > - > -static const struct watchdog_info atlas7_wdt_ident = { > - .options = OPTIONS, > - .firmware_version = 0, > - .identity = "atlas7 Watchdog", > -}; > - > -static const struct watchdog_ops atlas7_wdt_ops = { > - .owner = THIS_MODULE, > - .start = atlas7_wdt_enable, > - .stop = atlas7_wdt_disable, > - .get_timeleft = atlas7_wdt_gettimeleft, > - .ping = atlas7_wdt_ping, > - .set_timeout = atlas7_wdt_settimeout, > -}; > - > -static struct watchdog_device atlas7_wdd = { > - .info = &atlas7_wdt_ident, > - .ops = &atlas7_wdt_ops, > - .timeout = ATLAS7_WDT_DEFAULT_TIMEOUT, > -}; > - > -static const struct of_device_id atlas7_wdt_ids[] = { > - { .compatible = "sirf,atlas7-tick"}, > - {} > -}; > - > -static void atlas7_clk_disable_unprepare(void *data) > -{ > - clk_disable_unprepare(data); > -} > - > -static int atlas7_wdt_probe(struct platform_device *pdev) > -{ > - struct device *dev = &pdev->dev; > - struct atlas7_wdog *wdt; > - struct clk *clk; > - int ret; > - > - wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); > - if (!wdt) > - return -ENOMEM; > - wdt->base = devm_platform_ioremap_resource(pdev, 0); > - if (IS_ERR(wdt->base)) > - return PTR_ERR(wdt->base); > - > - clk = devm_clk_get(dev, NULL); > - if (IS_ERR(clk)) > - return PTR_ERR(clk); > - ret = clk_prepare_enable(clk); > - if (ret) { > - dev_err(dev, "clk enable failed\n"); > - return ret; > - } > - ret = devm_add_action_or_reset(dev, atlas7_clk_disable_unprepare, clk); > - if (ret) > - return ret; > - > - /* disable watchdog hardware */ > - writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL); > - > - wdt->tick_rate = clk_get_rate(clk); > - if (!wdt->tick_rate) > - return -EINVAL; > - > - wdt->clk = clk; > - atlas7_wdd.min_timeout = 1; > - atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate; > - > - watchdog_init_timeout(&atlas7_wdd, 0, dev); > - watchdog_set_nowayout(&atlas7_wdd, nowayout); > - > - watchdog_set_drvdata(&atlas7_wdd, wdt); > - platform_set_drvdata(pdev, &atlas7_wdd); > - > - watchdog_stop_on_reboot(&atlas7_wdd); > - watchdog_stop_on_unregister(&atlas7_wdd); > - return devm_watchdog_register_device(dev, &atlas7_wdd); > -} > - > -static int __maybe_unused atlas7_wdt_suspend(struct device *dev) > -{ > - /* > - * NOTE:timer controller registers settings are saved > - * and restored back by the timer-atlas7.c > - */ > - return 0; > -} > - > -static int __maybe_unused atlas7_wdt_resume(struct device *dev) > -{ > - struct watchdog_device *wdd = dev_get_drvdata(dev); > - > - /* > - * NOTE: Since timer controller registers settings are saved > - * and restored back by the timer-atlas7.c, so we need not > - * update WD settings except refreshing timeout. > - */ > - atlas7_wdt_ping(wdd); > - > - return 0; > -} > - > -static SIMPLE_DEV_PM_OPS(atlas7_wdt_pm_ops, > - atlas7_wdt_suspend, atlas7_wdt_resume); > - > -MODULE_DEVICE_TABLE(of, atlas7_wdt_ids); > - > -static struct platform_driver atlas7_wdt_driver = { > - .driver = { > - .name = "atlas7-wdt", > - .pm = &atlas7_wdt_pm_ops, > - .of_match_table = atlas7_wdt_ids, > - }, > - .probe = atlas7_wdt_probe, > -}; > -module_platform_driver(atlas7_wdt_driver); > - > -MODULE_DESCRIPTION("CSRatlas7 watchdog driver"); > -MODULE_AUTHOR("Guo Zeng <Guo.Zeng@csr.com>"); > -MODULE_LICENSE("GPL v2"); > -MODULE_ALIAS("platform:atlas7-wdt"); > -- > 2.29.2 >
Arnd Bergmann <arnd@kernel.org> 于2021年1月21日周四 上午5:27写道： > > From: Arnd Bergmann <arnd@arndb.de> > > The CSR SiRF prima2/atlas platforms are getting removed, so this driver > is no longer needed. > > Cc: Barry Song <baohua@kernel.org> > Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Barry Song <baohua@kernel.org> > --- > drivers/watchdog/Kconfig | 10 -- > drivers/watchdog/Makefile | 1 - > drivers/watchdog/atlas7_wdt.c | 221 ---------------------------------- > 3 files changed, 232 deletions(-) > delete mode 100644 drivers/watchdog/atlas7_wdt.c > > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig > index 88f4827849e4..5559e4325f6a 100644 > --- a/drivers/watchdog/Kconfig > +++ b/drivers/watchdog/Kconfig > @@ -890,16 +890,6 @@ config LPC18XX_WATCHDOG > To compile this driver as a module, choose M here: the > module will be called lpc18xx_wdt. > > -config ATLAS7_WATCHDOG > - tristate "CSRatlas7 watchdog" > - depends on ARCH_ATLAS7 || COMPILE_TEST > - help > - Say Y here to include Watchdog timer support for the watchdog > - existing on the CSRatlas7 series platforms. > - > - To compile this driver as a module, choose M here: the > - module will be called atlas7_wdt. > - > config RENESAS_WDT > tristate "Renesas WDT Watchdog" > depends on ARCH_RENESAS || COMPILE_TEST > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile > index 1741ed3c6ce6..40b94403c487 100644 > --- a/drivers/watchdog/Makefile > +++ b/drivers/watchdog/Makefile > @@ -83,7 +83,6 @@ obj-$(CONFIG_MEDIATEK_WATCHDOG) += mtk_wdt.o > obj-$(CONFIG_DIGICOLOR_WATCHDOG) += digicolor_wdt.o > obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o > obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o > -obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o > obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o > obj-$(CONFIG_RENESAS_RZAWDT) += rza_wdt.o > obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o > diff --git a/drivers/watchdog/atlas7_wdt.c b/drivers/watchdog/atlas7_wdt.c > deleted file mode 100644 > index 9bfe650d802f..000000000000 > --- a/drivers/watchdog/atlas7_wdt.c > +++ /dev/null > @@ -1,221 +0,0 @@ > -// SPDX-License-Identifier: GPL-2.0-only > -/* > - * Watchdog driver for CSR Atlas7 > - * > - * Copyright (c) 2015 Cambridge Silicon Radio Limited, a CSR plc group company. > - */ > - > -#include <linux/clk.h> > -#include <linux/io.h> > -#include <linux/module.h> > -#include <linux/moduleparam.h> > -#include <linux/of.h> > -#include <linux/platform_device.h> > -#include <linux/watchdog.h> > - > -#define ATLAS7_TIMER_WDT_INDEX 5 > -#define ATLAS7_WDT_DEFAULT_TIMEOUT 20 > - > -#define ATLAS7_WDT_CNT_CTRL (0 + 4 * ATLAS7_TIMER_WDT_INDEX) > -#define ATLAS7_WDT_CNT_MATCH (0x18 + 4 * ATLAS7_TIMER_WDT_INDEX) > -#define ATLAS7_WDT_CNT (0x48 + 4 * ATLAS7_TIMER_WDT_INDEX) > -#define ATLAS7_WDT_CNT_EN (BIT(0) | BIT(1)) > -#define ATLAS7_WDT_EN 0x64 > - > -static unsigned int timeout = ATLAS7_WDT_DEFAULT_TIMEOUT; > -static bool nowayout = WATCHDOG_NOWAYOUT; > - > -module_param(timeout, uint, 0); > -module_param(nowayout, bool, 0); > - > -MODULE_PARM_DESC(timeout, "Default watchdog timeout (in seconds)"); > -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" > - __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); > - > -struct atlas7_wdog { > - struct device *dev; > - void __iomem *base; > - unsigned long tick_rate; > - struct clk *clk; > -}; > - > -static unsigned int atlas7_wdt_gettimeleft(struct watchdog_device *wdd) > -{ > - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); > - u32 counter, match, delta; > - > - counter = readl(wdt->base + ATLAS7_WDT_CNT); > - match = readl(wdt->base + ATLAS7_WDT_CNT_MATCH); > - delta = match - counter; > - > - return delta / wdt->tick_rate; > -} > - > -static int atlas7_wdt_ping(struct watchdog_device *wdd) > -{ > - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); > - u32 counter, match, delta; > - > - counter = readl(wdt->base + ATLAS7_WDT_CNT); > - delta = wdd->timeout * wdt->tick_rate; > - match = counter + delta; > - > - writel(match, wdt->base + ATLAS7_WDT_CNT_MATCH); > - > - return 0; > -} > - > -static int atlas7_wdt_enable(struct watchdog_device *wdd) > -{ > - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); > - > - atlas7_wdt_ping(wdd); > - > - writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) | ATLAS7_WDT_CNT_EN, > - wdt->base + ATLAS7_WDT_CNT_CTRL); > - writel(1, wdt->base + ATLAS7_WDT_EN); > - > - return 0; > -} > - > -static int atlas7_wdt_disable(struct watchdog_device *wdd) > -{ > - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); > - > - writel(0, wdt->base + ATLAS7_WDT_EN); > - writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) & ~ATLAS7_WDT_CNT_EN, > - wdt->base + ATLAS7_WDT_CNT_CTRL); > - > - return 0; > -} > - > -static int atlas7_wdt_settimeout(struct watchdog_device *wdd, unsigned int to) > -{ > - wdd->timeout = to; > - > - return 0; > -} > - > -#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE) > - > -static const struct watchdog_info atlas7_wdt_ident = { > - .options = OPTIONS, > - .firmware_version = 0, > - .identity = "atlas7 Watchdog", > -}; > - > -static const struct watchdog_ops atlas7_wdt_ops = { > - .owner = THIS_MODULE, > - .start = atlas7_wdt_enable, > - .stop = atlas7_wdt_disable, > - .get_timeleft = atlas7_wdt_gettimeleft, > - .ping = atlas7_wdt_ping, > - .set_timeout = atlas7_wdt_settimeout, > -}; > - > -static struct watchdog_device atlas7_wdd = { > - .info = &atlas7_wdt_ident, > - .ops = &atlas7_wdt_ops, > - .timeout = ATLAS7_WDT_DEFAULT_TIMEOUT, > -}; > - > -static const struct of_device_id atlas7_wdt_ids[] = { > - { .compatible = "sirf,atlas7-tick"}, > - {} > -}; > - > -static void atlas7_clk_disable_unprepare(void *data) > -{ > - clk_disable_unprepare(data); > -} > - > -static int atlas7_wdt_probe(struct platform_device *pdev) > -{ > - struct device *dev = &pdev->dev; > - struct atlas7_wdog *wdt; > - struct clk *clk; > - int ret; > - > - wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); > - if (!wdt) > - return -ENOMEM; > - wdt->base = devm_platform_ioremap_resource(pdev, 0); > - if (IS_ERR(wdt->base)) > - return PTR_ERR(wdt->base); > - > - clk = devm_clk_get(dev, NULL); > - if (IS_ERR(clk)) > - return PTR_ERR(clk); > - ret = clk_prepare_enable(clk); > - if (ret) { > - dev_err(dev, "clk enable failed\n"); > - return ret; > - } > - ret = devm_add_action_or_reset(dev, atlas7_clk_disable_unprepare, clk); > - if (ret) > - return ret; > - > - /* disable watchdog hardware */ > - writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL); > - > - wdt->tick_rate = clk_get_rate(clk); > - if (!wdt->tick_rate) > - return -EINVAL; > - > - wdt->clk = clk; > - atlas7_wdd.min_timeout = 1; > - atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate; > - > - watchdog_init_timeout(&atlas7_wdd, 0, dev); > - watchdog_set_nowayout(&atlas7_wdd, nowayout); > - > - watchdog_set_drvdata(&atlas7_wdd, wdt); > - platform_set_drvdata(pdev, &atlas7_wdd); > - > - watchdog_stop_on_reboot(&atlas7_wdd); > - watchdog_stop_on_unregister(&atlas7_wdd); > - return devm_watchdog_register_device(dev, &atlas7_wdd); > -} > - > -static int __maybe_unused atlas7_wdt_suspend(struct device *dev) > -{ > - /* > - * NOTE:timer controller registers settings are saved > - * and restored back by the timer-atlas7.c > - */ > - return 0; > -} > - > -static int __maybe_unused atlas7_wdt_resume(struct device *dev) > -{ > - struct watchdog_device *wdd = dev_get_drvdata(dev); > - > - /* > - * NOTE: Since timer controller registers settings are saved > - * and restored back by the timer-atlas7.c, so we need not > - * update WD settings except refreshing timeout. > - */ > - atlas7_wdt_ping(wdd); > - > - return 0; > -} > - > -static SIMPLE_DEV_PM_OPS(atlas7_wdt_pm_ops, > - atlas7_wdt_suspend, atlas7_wdt_resume); > - > -MODULE_DEVICE_TABLE(of, atlas7_wdt_ids); > - > -static struct platform_driver atlas7_wdt_driver = { > - .driver = { > - .name = "atlas7-wdt", > - .pm = &atlas7_wdt_pm_ops, > - .of_match_table = atlas7_wdt_ids, > - }, > - .probe = atlas7_wdt_probe, > -}; > -module_platform_driver(atlas7_wdt_driver); > - > -MODULE_DESCRIPTION("CSRatlas7 watchdog driver"); > -MODULE_AUTHOR("Guo Zeng <Guo.Zeng@csr.com>"); > -MODULE_LICENSE("GPL v2"); > -MODULE_ALIAS("platform:atlas7-wdt"); > -- > 2.29.2 >
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 88f4827849e4..5559e4325f6a 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -890,16 +890,6 @@ config LPC18XX_WATCHDOG To compile this driver as a module, choose M here: the module will be called lpc18xx_wdt. -config ATLAS7_WATCHDOG - tristate "CSRatlas7 watchdog" - depends on ARCH_ATLAS7 || COMPILE_TEST - help - Say Y here to include Watchdog timer support for the watchdog - existing on the CSRatlas7 series platforms. - - To compile this driver as a module, choose M here: the - module will be called atlas7_wdt. - config RENESAS_WDT tristate "Renesas WDT Watchdog" depends on ARCH_RENESAS || COMPILE_TEST diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 1741ed3c6ce6..40b94403c487 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -83,7 +83,6 @@ obj-$(CONFIG_MEDIATEK_WATCHDOG) += mtk_wdt.o obj-$(CONFIG_DIGICOLOR_WATCHDOG) += digicolor_wdt.o obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o -obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o obj-$(CONFIG_RENESAS_RZAWDT) += rza_wdt.o obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o diff --git a/drivers/watchdog/atlas7_wdt.c b/drivers/watchdog/atlas7_wdt.c deleted file mode 100644 index 9bfe650d802f..000000000000 --- a/drivers/watchdog/atlas7_wdt.c +++ /dev/null @@ -1,221 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Watchdog driver for CSR Atlas7 - * - * Copyright (c) 2015 Cambridge Silicon Radio Limited, a CSR plc group company. - */ - -#include <linux/clk.h> -#include <linux/io.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/of.h> -#include <linux/platform_device.h> -#include <linux/watchdog.h> - -#define ATLAS7_TIMER_WDT_INDEX 5 -#define ATLAS7_WDT_DEFAULT_TIMEOUT 20 - -#define ATLAS7_WDT_CNT_CTRL (0 + 4 * ATLAS7_TIMER_WDT_INDEX) -#define ATLAS7_WDT_CNT_MATCH (0x18 + 4 * ATLAS7_TIMER_WDT_INDEX) -#define ATLAS7_WDT_CNT (0x48 + 4 * ATLAS7_TIMER_WDT_INDEX) -#define ATLAS7_WDT_CNT_EN (BIT(0) | BIT(1)) -#define ATLAS7_WDT_EN 0x64 - -static unsigned int timeout = ATLAS7_WDT_DEFAULT_TIMEOUT; -static bool nowayout = WATCHDOG_NOWAYOUT; - -module_param(timeout, uint, 0); -module_param(nowayout, bool, 0); - -MODULE_PARM_DESC(timeout, "Default watchdog timeout (in seconds)"); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" - __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -struct atlas7_wdog { - struct device *dev; - void __iomem *base; - unsigned long tick_rate; - struct clk *clk; -}; - -static unsigned int atlas7_wdt_gettimeleft(struct watchdog_device *wdd) -{ - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); - u32 counter, match, delta; - - counter = readl(wdt->base + ATLAS7_WDT_CNT); - match = readl(wdt->base + ATLAS7_WDT_CNT_MATCH); - delta = match - counter; - - return delta / wdt->tick_rate; -} - -static int atlas7_wdt_ping(struct watchdog_device *wdd) -{ - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); - u32 counter, match, delta; - - counter = readl(wdt->base + ATLAS7_WDT_CNT); - delta = wdd->timeout * wdt->tick_rate; - match = counter + delta; - - writel(match, wdt->base + ATLAS7_WDT_CNT_MATCH); - - return 0; -} - -static int atlas7_wdt_enable(struct watchdog_device *wdd) -{ - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); - - atlas7_wdt_ping(wdd); - - writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) | ATLAS7_WDT_CNT_EN, - wdt->base + ATLAS7_WDT_CNT_CTRL); - writel(1, wdt->base + ATLAS7_WDT_EN); - - return 0; -} - -static int atlas7_wdt_disable(struct watchdog_device *wdd) -{ - struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd); - - writel(0, wdt->base + ATLAS7_WDT_EN); - writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) & ~ATLAS7_WDT_CNT_EN, - wdt->base + ATLAS7_WDT_CNT_CTRL); - - return 0; -} - -static int atlas7_wdt_settimeout(struct watchdog_device *wdd, unsigned int to) -{ - wdd->timeout = to; - - return 0; -} - -#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE) - -static const struct watchdog_info atlas7_wdt_ident = { - .options = OPTIONS, - .firmware_version = 0, - .identity = "atlas7 Watchdog", -}; - -static const struct watchdog_ops atlas7_wdt_ops = { - .owner = THIS_MODULE, - .start = atlas7_wdt_enable, - .stop = atlas7_wdt_disable, - .get_timeleft = atlas7_wdt_gettimeleft, - .ping = atlas7_wdt_ping, - .set_timeout = atlas7_wdt_settimeout, -}; - -static struct watchdog_device atlas7_wdd = { - .info = &atlas7_wdt_ident, - .ops = &atlas7_wdt_ops, - .timeout = ATLAS7_WDT_DEFAULT_TIMEOUT, -}; - -static const struct of_device_id atlas7_wdt_ids[] = { - { .compatible = "sirf,atlas7-tick"}, - {} -}; - -static void atlas7_clk_disable_unprepare(void *data) -{ - clk_disable_unprepare(data); -} - -static int atlas7_wdt_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct atlas7_wdog *wdt; - struct clk *clk; - int ret; - - wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); - if (!wdt) - return -ENOMEM; - wdt->base = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(wdt->base)) - return PTR_ERR(wdt->base); - - clk = devm_clk_get(dev, NULL); - if (IS_ERR(clk)) - return PTR_ERR(clk); - ret = clk_prepare_enable(clk); - if (ret) { - dev_err(dev, "clk enable failed\n"); - return ret; - } - ret = devm_add_action_or_reset(dev, atlas7_clk_disable_unprepare, clk); - if (ret) - return ret; - - /* disable watchdog hardware */ - writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL); - - wdt->tick_rate = clk_get_rate(clk); - if (!wdt->tick_rate) - return -EINVAL; - - wdt->clk = clk; - atlas7_wdd.min_timeout = 1; - atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate; - - watchdog_init_timeout(&atlas7_wdd, 0, dev); - watchdog_set_nowayout(&atlas7_wdd, nowayout); - - watchdog_set_drvdata(&atlas7_wdd, wdt); - platform_set_drvdata(pdev, &atlas7_wdd); - - watchdog_stop_on_reboot(&atlas7_wdd); - watchdog_stop_on_unregister(&atlas7_wdd); - return devm_watchdog_register_device(dev, &atlas7_wdd); -} - -static int __maybe_unused atlas7_wdt_suspend(struct device *dev) -{ - /* - * NOTE:timer controller registers settings are saved - * and restored back by the timer-atlas7.c - */ - return 0; -} - -static int __maybe_unused atlas7_wdt_resume(struct device *dev) -{ - struct watchdog_device *wdd = dev_get_drvdata(dev); - - /* - * NOTE: Since timer controller registers settings are saved - * and restored back by the timer-atlas7.c, so we need not - * update WD settings except refreshing timeout. - */ - atlas7_wdt_ping(wdd); - - return 0; -} - -static SIMPLE_DEV_PM_OPS(atlas7_wdt_pm_ops, - atlas7_wdt_suspend, atlas7_wdt_resume); - -MODULE_DEVICE_TABLE(of, atlas7_wdt_ids); - -static struct platform_driver atlas7_wdt_driver = { - .driver = { - .name = "atlas7-wdt", - .pm = &atlas7_wdt_pm_ops, - .of_match_table = atlas7_wdt_ids, - }, - .probe = atlas7_wdt_probe, -}; -module_platform_driver(atlas7_wdt_driver); - -MODULE_DESCRIPTION("CSRatlas7 watchdog driver"); -MODULE_AUTHOR("Guo Zeng <Guo.Zeng@csr.com>"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:atlas7-wdt");