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![Bhumika Goyal](/assets/img/avatar_default.png)
Declare watchdog_ops structures as const as they are only stored in the ops field of a watchdog_device structure. This field is of type const, so watchdog_ops structures having this property can be made const too. Done using Coccinelle: @r disable optional_qualifier@ identifier x; position p; @@ static struct watchdog_ops x@p={...}; @ok@ struct watchdog_device w; identifier r.x; position p; @@ w.ops=&x@p; @bad@ position p != {r.p,ok.p}; identifier r.x; @@ x@p @depends on !bad disable optional_qualifier@ identifier r.x; @@ +const struct watchdog_ops x; File size details before and after patching. First line of every .o file shows the file size before patching and second line shows the size after patching. text data bss dec hex filename 1340 544 0 1884 75c drivers/watchdog/bcm_kona_wdt.o 1436 440 0 1876 754 drivers/watchdog/bcm_kona_wdt.o 1176 544 4 1724 6bc drivers/watchdog/digicolor_wdt.o 1272 440 4 1716 6b4 drivers/watchdog/digicolor_wdt.o 925 580 89 1594 63a drivers/watchdog/ep93xx_wdt.o 1021 476 89 1586 632 drivers/watchdog/ep93xx_wdt.o 4932 288 17 5237 1475 drivers/watchdog/s3c2410_wdt.o 5028 192 17 5237 1475 drivers/watchdog/s3c2410_wdt.o 1977 292 1 2270 8de drivers/watchdog/sama5d4_wdt.o 2073 196 1 2270 8de drivers/watchdog/sama5d4_wdt.o 1375 484 1 1860 744 drivers/watchdog/sirfsoc_wdt.o 1471 380 1 1852 73c drivers/watchdog/sirfsoc_wdt.o Size remains the same for the files drivers/watchdog/diag288_wdt.o drivers/watchdog/asm9260_wdt.o and drivers/watchdog/atlas7_wdt.o The following .o files did not compile: drivers/watchdog/sun4v_wdt.o, drivers/watchdog/sbsa_gwdt.o, drivers/watchdog/rt2880_wdt.o, drivers/watchdog/booke_wdt.o drivers/watchdog/mt7621_wdt.o Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
175 lines
4.2 KiB
C
175 lines
4.2 KiB
C
/*
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* Watchdog driver for Conexant Digicolor
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*
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* Copyright (C) 2015 Paradox Innovation Ltd.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/watchdog.h>
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#include <linux/platform_device.h>
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#include <linux/of_address.h>
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#define TIMER_A_CONTROL 0
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#define TIMER_A_COUNT 4
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#define TIMER_A_ENABLE_COUNT BIT(0)
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#define TIMER_A_ENABLE_WATCHDOG BIT(1)
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struct dc_wdt {
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void __iomem *base;
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struct clk *clk;
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spinlock_t lock;
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};
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static unsigned timeout;
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module_param(timeout, uint, 0);
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
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static void dc_wdt_set(struct dc_wdt *wdt, u32 ticks)
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{
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unsigned long flags;
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spin_lock_irqsave(&wdt->lock, flags);
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writel_relaxed(0, wdt->base + TIMER_A_CONTROL);
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writel_relaxed(ticks, wdt->base + TIMER_A_COUNT);
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writel_relaxed(TIMER_A_ENABLE_COUNT | TIMER_A_ENABLE_WATCHDOG,
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wdt->base + TIMER_A_CONTROL);
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spin_unlock_irqrestore(&wdt->lock, flags);
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}
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static int dc_wdt_restart(struct watchdog_device *wdog, unsigned long action,
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void *data)
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{
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struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
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dc_wdt_set(wdt, 1);
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/* wait for reset to assert... */
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mdelay(500);
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return 0;
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}
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static int dc_wdt_start(struct watchdog_device *wdog)
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{
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struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
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dc_wdt_set(wdt, wdog->timeout * clk_get_rate(wdt->clk));
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return 0;
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}
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static int dc_wdt_stop(struct watchdog_device *wdog)
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{
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struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
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writel_relaxed(0, wdt->base + TIMER_A_CONTROL);
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return 0;
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}
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static int dc_wdt_set_timeout(struct watchdog_device *wdog, unsigned int t)
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{
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struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
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dc_wdt_set(wdt, t * clk_get_rate(wdt->clk));
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wdog->timeout = t;
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return 0;
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}
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static unsigned int dc_wdt_get_timeleft(struct watchdog_device *wdog)
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{
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struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
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uint32_t count = readl_relaxed(wdt->base + TIMER_A_COUNT);
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return count / clk_get_rate(wdt->clk);
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}
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static const struct watchdog_ops dc_wdt_ops = {
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.owner = THIS_MODULE,
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.start = dc_wdt_start,
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.stop = dc_wdt_stop,
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.set_timeout = dc_wdt_set_timeout,
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.get_timeleft = dc_wdt_get_timeleft,
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.restart = dc_wdt_restart,
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};
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static const struct watchdog_info dc_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE
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| WDIOF_KEEPALIVEPING,
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.identity = "Conexant Digicolor Watchdog",
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};
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static struct watchdog_device dc_wdt_wdd = {
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.info = &dc_wdt_info,
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.ops = &dc_wdt_ops,
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.min_timeout = 1,
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};
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static int dc_wdt_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct device *dev = &pdev->dev;
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struct dc_wdt *wdt;
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int ret;
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wdt = devm_kzalloc(dev, sizeof(struct dc_wdt), GFP_KERNEL);
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if (!wdt)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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wdt->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(wdt->base))
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return PTR_ERR(wdt->base);
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wdt->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(wdt->clk))
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return PTR_ERR(wdt->clk);
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dc_wdt_wdd.max_timeout = U32_MAX / clk_get_rate(wdt->clk);
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dc_wdt_wdd.timeout = dc_wdt_wdd.max_timeout;
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dc_wdt_wdd.parent = dev;
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spin_lock_init(&wdt->lock);
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watchdog_set_drvdata(&dc_wdt_wdd, wdt);
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watchdog_set_restart_priority(&dc_wdt_wdd, 128);
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watchdog_init_timeout(&dc_wdt_wdd, timeout, dev);
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watchdog_stop_on_reboot(&dc_wdt_wdd);
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ret = devm_watchdog_register_device(dev, &dc_wdt_wdd);
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if (ret) {
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dev_err(dev, "Failed to register watchdog device");
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return ret;
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}
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return 0;
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}
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static const struct of_device_id dc_wdt_of_match[] = {
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{ .compatible = "cnxt,cx92755-wdt", },
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{},
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};
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MODULE_DEVICE_TABLE(of, dc_wdt_of_match);
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static struct platform_driver dc_wdt_driver = {
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.probe = dc_wdt_probe,
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.driver = {
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.name = "digicolor-wdt",
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.of_match_table = dc_wdt_of_match,
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},
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};
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module_platform_driver(dc_wdt_driver);
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MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
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MODULE_DESCRIPTION("Driver for Conexant Digicolor watchdog timer");
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MODULE_LICENSE("GPL");
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