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b893e344bf
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>
209 lines
4.9 KiB
C
209 lines
4.9 KiB
C
/*
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* Ralink RT288x/RT3xxx/MT76xx built-in hardware watchdog timer
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*
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* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2013 John Crispin <john@phrozen.org>
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*
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* This driver was based on: drivers/watchdog/softdog.c
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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 version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/reset.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/watchdog.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <asm/mach-ralink/ralink_regs.h>
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#define SYSC_RSTSTAT 0x38
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#define WDT_RST_CAUSE BIT(1)
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#define RALINK_WDT_TIMEOUT 30
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#define RALINK_WDT_PRESCALE 65536
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#define TIMER_REG_TMR1LOAD 0x00
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#define TIMER_REG_TMR1CTL 0x08
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#define TMRSTAT_TMR1RST BIT(5)
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#define TMR1CTL_ENABLE BIT(7)
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#define TMR1CTL_MODE_SHIFT 4
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#define TMR1CTL_MODE_MASK 0x3
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#define TMR1CTL_MODE_FREE_RUNNING 0x0
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#define TMR1CTL_MODE_PERIODIC 0x1
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#define TMR1CTL_MODE_TIMEOUT 0x2
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#define TMR1CTL_MODE_WDT 0x3
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#define TMR1CTL_PRESCALE_MASK 0xf
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#define TMR1CTL_PRESCALE_65536 0xf
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static struct clk *rt288x_wdt_clk;
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static unsigned long rt288x_wdt_freq;
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static void __iomem *rt288x_wdt_base;
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static struct reset_control *rt288x_wdt_reset;
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static inline void rt_wdt_w32(unsigned reg, u32 val)
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{
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iowrite32(val, rt288x_wdt_base + reg);
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}
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static inline u32 rt_wdt_r32(unsigned reg)
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{
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return ioread32(rt288x_wdt_base + reg);
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}
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static int rt288x_wdt_ping(struct watchdog_device *w)
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{
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rt_wdt_w32(TIMER_REG_TMR1LOAD, w->timeout * rt288x_wdt_freq);
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return 0;
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}
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static int rt288x_wdt_start(struct watchdog_device *w)
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{
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u32 t;
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t = rt_wdt_r32(TIMER_REG_TMR1CTL);
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t &= ~(TMR1CTL_MODE_MASK << TMR1CTL_MODE_SHIFT |
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TMR1CTL_PRESCALE_MASK);
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t |= (TMR1CTL_MODE_WDT << TMR1CTL_MODE_SHIFT |
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TMR1CTL_PRESCALE_65536);
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rt_wdt_w32(TIMER_REG_TMR1CTL, t);
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rt288x_wdt_ping(w);
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t = rt_wdt_r32(TIMER_REG_TMR1CTL);
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t |= TMR1CTL_ENABLE;
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rt_wdt_w32(TIMER_REG_TMR1CTL, t);
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return 0;
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}
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static int rt288x_wdt_stop(struct watchdog_device *w)
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{
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u32 t;
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rt288x_wdt_ping(w);
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t = rt_wdt_r32(TIMER_REG_TMR1CTL);
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t &= ~TMR1CTL_ENABLE;
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rt_wdt_w32(TIMER_REG_TMR1CTL, t);
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return 0;
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}
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static int rt288x_wdt_set_timeout(struct watchdog_device *w, unsigned int t)
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{
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w->timeout = t;
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rt288x_wdt_ping(w);
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return 0;
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}
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static int rt288x_wdt_bootcause(void)
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{
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if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE)
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return WDIOF_CARDRESET;
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return 0;
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}
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static struct watchdog_info rt288x_wdt_info = {
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.identity = "Ralink Watchdog",
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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};
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static const struct watchdog_ops rt288x_wdt_ops = {
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.owner = THIS_MODULE,
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.start = rt288x_wdt_start,
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.stop = rt288x_wdt_stop,
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.ping = rt288x_wdt_ping,
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.set_timeout = rt288x_wdt_set_timeout,
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};
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static struct watchdog_device rt288x_wdt_dev = {
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.info = &rt288x_wdt_info,
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.ops = &rt288x_wdt_ops,
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.min_timeout = 1,
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};
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static int rt288x_wdt_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int ret;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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rt288x_wdt_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(rt288x_wdt_base))
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return PTR_ERR(rt288x_wdt_base);
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rt288x_wdt_clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(rt288x_wdt_clk))
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return PTR_ERR(rt288x_wdt_clk);
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rt288x_wdt_reset = devm_reset_control_get(&pdev->dev, NULL);
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if (!IS_ERR(rt288x_wdt_reset))
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reset_control_deassert(rt288x_wdt_reset);
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rt288x_wdt_freq = clk_get_rate(rt288x_wdt_clk) / RALINK_WDT_PRESCALE;
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rt288x_wdt_dev.bootstatus = rt288x_wdt_bootcause();
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rt288x_wdt_dev.max_timeout = (0xfffful / rt288x_wdt_freq);
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rt288x_wdt_dev.parent = &pdev->dev;
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watchdog_init_timeout(&rt288x_wdt_dev, rt288x_wdt_dev.max_timeout,
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&pdev->dev);
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watchdog_set_nowayout(&rt288x_wdt_dev, nowayout);
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ret = watchdog_register_device(&rt288x_wdt_dev);
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if (!ret)
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dev_info(&pdev->dev, "Initialized\n");
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return 0;
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}
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static int rt288x_wdt_remove(struct platform_device *pdev)
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{
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watchdog_unregister_device(&rt288x_wdt_dev);
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return 0;
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}
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static void rt288x_wdt_shutdown(struct platform_device *pdev)
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{
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rt288x_wdt_stop(&rt288x_wdt_dev);
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}
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static const struct of_device_id rt288x_wdt_match[] = {
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{ .compatible = "ralink,rt2880-wdt" },
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{},
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};
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MODULE_DEVICE_TABLE(of, rt288x_wdt_match);
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static struct platform_driver rt288x_wdt_driver = {
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.probe = rt288x_wdt_probe,
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.remove = rt288x_wdt_remove,
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.shutdown = rt288x_wdt_shutdown,
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = rt288x_wdt_match,
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},
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};
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module_platform_driver(rt288x_wdt_driver);
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MODULE_DESCRIPTION("MediaTek/Ralink RT288x/RT3xxx hardware watchdog driver");
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org");
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MODULE_LICENSE("GPL v2");
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