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Message-ID: <CAGsJ_4zMzpdN1bdw=rLFShMg83Qc8i-So-quCtB+vuuaa4+M+w@mail.gmail.com>
Date: Thu, 21 Jan 2021 10:17:11 +1300
From: Barry Song <baohua@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org,
LKML <linux-kernel@...r.kernel.org>,
linux-watchdog@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
Wim Van Sebroeck <wim@...ux-watchdog.org>,
Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 2/5] watchdog: remove sirf atlas driver
Arnd Bergmann <arnd@...nel.org> 于2021年1月21日周四 上午5:27写道：
>
> From: Arnd Bergmann <arnd@...db.de>
>
> The CSR SiRF prima2/atlas platforms are getting removed, so this driver
> is no longer needed.
>
> Cc: Barry Song <baohua@...nel.org>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Barry Song <baohua@...nel.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@....com>");
> -MODULE_LICENSE("GPL v2");
> -MODULE_ALIAS("platform:atlas7-wdt");
> --
> 2.29.2
>
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