Blame view
drivers/watchdog/jz4740_wdt.c
6.21 KB
f865c3522 watchdog: add JZ4... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
/* * Copyright (C) 2010, Paul Cercueil <paul@crapouillou.net> * JZ4740 Watchdog driver * * 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. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/kernel.h> |
f865c3522 watchdog: add JZ4... |
20 |
#include <linux/watchdog.h> |
f865c3522 watchdog: add JZ4... |
21 |
#include <linux/platform_device.h> |
f865c3522 watchdog: add JZ4... |
22 23 24 25 |
#include <linux/io.h> #include <linux/device.h> #include <linux/clk.h> #include <linux/slab.h> |
85f6df149 watchdog: Convert... |
26 |
#include <linux/err.h> |
6b96c7227 watchdog: jz4740:... |
27 |
#include <linux/of.h> |
f865c3522 watchdog: add JZ4... |
28 29 30 31 32 33 34 35 36 37 38 |
#include <asm/mach-jz4740/timer.h> #define JZ_REG_WDT_TIMER_DATA 0x0 #define JZ_REG_WDT_COUNTER_ENABLE 0x4 #define JZ_REG_WDT_TIMER_COUNTER 0x8 #define JZ_REG_WDT_TIMER_CONTROL 0xC #define JZ_WDT_CLOCK_PCLK 0x1 #define JZ_WDT_CLOCK_RTC 0x2 #define JZ_WDT_CLOCK_EXT 0x4 |
f865c3522 watchdog: add JZ4... |
39 40 41 42 43 44 45 46 47 48 49 |
#define JZ_WDT_CLOCK_DIV_SHIFT 3 #define JZ_WDT_CLOCK_DIV_1 (0 << JZ_WDT_CLOCK_DIV_SHIFT) #define JZ_WDT_CLOCK_DIV_4 (1 << JZ_WDT_CLOCK_DIV_SHIFT) #define JZ_WDT_CLOCK_DIV_16 (2 << JZ_WDT_CLOCK_DIV_SHIFT) #define JZ_WDT_CLOCK_DIV_64 (3 << JZ_WDT_CLOCK_DIV_SHIFT) #define JZ_WDT_CLOCK_DIV_256 (4 << JZ_WDT_CLOCK_DIV_SHIFT) #define JZ_WDT_CLOCK_DIV_1024 (5 << JZ_WDT_CLOCK_DIV_SHIFT) #define DEFAULT_HEARTBEAT 5 #define MAX_HEARTBEAT 2048 |
85f6df149 watchdog: Convert... |
50 51 52 53 54 |
static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
f865c3522 watchdog: add JZ4... |
55 |
|
85f6df149 watchdog: Convert... |
56 57 58 59 60 61 |
static unsigned int heartbeat = DEFAULT_HEARTBEAT; module_param(heartbeat, uint, 0); MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat period in seconds from 1 to " __MODULE_STRING(MAX_HEARTBEAT) ", default " __MODULE_STRING(DEFAULT_HEARTBEAT)); |
f865c3522 watchdog: add JZ4... |
62 |
|
85f6df149 watchdog: Convert... |
63 64 65 66 67 |
struct jz4740_wdt_drvdata { struct watchdog_device wdt; void __iomem *base; struct clk *rtc_clk; }; |
f865c3522 watchdog: add JZ4... |
68 |
|
85f6df149 watchdog: Convert... |
69 |
static int jz4740_wdt_ping(struct watchdog_device *wdt_dev) |
f865c3522 watchdog: add JZ4... |
70 |
{ |
85f6df149 watchdog: Convert... |
71 72 73 74 |
struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev); writew(0x0, drvdata->base + JZ_REG_WDT_TIMER_COUNTER); return 0; |
f865c3522 watchdog: add JZ4... |
75 |
} |
85f6df149 watchdog: Convert... |
76 77 |
static int jz4740_wdt_set_timeout(struct watchdog_device *wdt_dev, unsigned int new_timeout) |
f865c3522 watchdog: add JZ4... |
78 |
{ |
85f6df149 watchdog: Convert... |
79 |
struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev); |
f865c3522 watchdog: add JZ4... |
80 81 82 |
unsigned int rtc_clk_rate; unsigned int timeout_value; unsigned short clock_div = JZ_WDT_CLOCK_DIV_1; |
85f6df149 watchdog: Convert... |
83 |
rtc_clk_rate = clk_get_rate(drvdata->rtc_clk); |
f865c3522 watchdog: add JZ4... |
84 |
|
85f6df149 watchdog: Convert... |
85 |
timeout_value = rtc_clk_rate * new_timeout; |
f865c3522 watchdog: add JZ4... |
86 87 88 89 90 91 92 93 94 95 |
while (timeout_value > 0xffff) { if (clock_div == JZ_WDT_CLOCK_DIV_1024) { /* Requested timeout too high; * use highest possible value. */ timeout_value = 0xffff; break; } timeout_value >>= 2; clock_div += (1 << JZ_WDT_CLOCK_DIV_SHIFT); } |
85f6df149 watchdog: Convert... |
96 97 |
writeb(0x0, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE); writew(clock_div, drvdata->base + JZ_REG_WDT_TIMER_CONTROL); |
f865c3522 watchdog: add JZ4... |
98 |
|
85f6df149 watchdog: Convert... |
99 100 |
writew((u16)timeout_value, drvdata->base + JZ_REG_WDT_TIMER_DATA); writew(0x0, drvdata->base + JZ_REG_WDT_TIMER_COUNTER); |
f865c3522 watchdog: add JZ4... |
101 |
writew(clock_div | JZ_WDT_CLOCK_RTC, |
85f6df149 watchdog: Convert... |
102 |
drvdata->base + JZ_REG_WDT_TIMER_CONTROL); |
f865c3522 watchdog: add JZ4... |
103 |
|
85f6df149 watchdog: Convert... |
104 |
writeb(0x1, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE); |
f865c3522 watchdog: add JZ4... |
105 |
|
0197c1c49 watchdog: fix set... |
106 |
wdt_dev->timeout = new_timeout; |
85f6df149 watchdog: Convert... |
107 |
return 0; |
f865c3522 watchdog: add JZ4... |
108 |
} |
85f6df149 watchdog: Convert... |
109 |
static int jz4740_wdt_start(struct watchdog_device *wdt_dev) |
f865c3522 watchdog: add JZ4... |
110 |
{ |
85f6df149 watchdog: Convert... |
111 112 |
jz4740_timer_enable_watchdog(); jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout); |
f865c3522 watchdog: add JZ4... |
113 |
|
85f6df149 watchdog: Convert... |
114 |
return 0; |
f865c3522 watchdog: add JZ4... |
115 |
} |
85f6df149 watchdog: Convert... |
116 |
static int jz4740_wdt_stop(struct watchdog_device *wdt_dev) |
f865c3522 watchdog: add JZ4... |
117 |
{ |
85f6df149 watchdog: Convert... |
118 |
struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev); |
742e4b630 watchdog: jz4740_... |
119 |
|
85f6df149 watchdog: Convert... |
120 121 |
jz4740_timer_disable_watchdog(); writeb(0x0, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE); |
f865c3522 watchdog: add JZ4... |
122 |
|
85f6df149 watchdog: Convert... |
123 |
return 0; |
f865c3522 watchdog: add JZ4... |
124 |
} |
85f6df149 watchdog: Convert... |
125 126 |
static const struct watchdog_info jz4740_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, |
f865c3522 watchdog: add JZ4... |
127 128 |
.identity = "jz4740 Watchdog", }; |
85f6df149 watchdog: Convert... |
129 |
static const struct watchdog_ops jz4740_wdt_ops = { |
f865c3522 watchdog: add JZ4... |
130 |
.owner = THIS_MODULE, |
85f6df149 watchdog: Convert... |
131 132 133 134 |
.start = jz4740_wdt_start, .stop = jz4740_wdt_stop, .ping = jz4740_wdt_ping, .set_timeout = jz4740_wdt_set_timeout, |
f865c3522 watchdog: add JZ4... |
135 |
}; |
6b96c7227 watchdog: jz4740:... |
136 137 138 139 140 141 142 |
#ifdef CONFIG_OF static const struct of_device_id jz4740_wdt_of_matches[] = { { .compatible = "ingenic,jz4740-watchdog", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, jz4740_wdt_of_matches) #endif |
2d991a164 watchdog: remove ... |
143 |
static int jz4740_wdt_probe(struct platform_device *pdev) |
f865c3522 watchdog: add JZ4... |
144 |
{ |
85f6df149 watchdog: Convert... |
145 146 147 148 149 150 151 |
struct jz4740_wdt_drvdata *drvdata; struct watchdog_device *jz4740_wdt; struct resource *res; int ret; drvdata = devm_kzalloc(&pdev->dev, sizeof(struct jz4740_wdt_drvdata), GFP_KERNEL); |
e26e74b15 watchdog: remove ... |
152 |
if (!drvdata) |
85f6df149 watchdog: Convert... |
153 |
return -ENOMEM; |
f865c3522 watchdog: add JZ4... |
154 |
|
85f6df149 watchdog: Convert... |
155 156 |
if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT) heartbeat = DEFAULT_HEARTBEAT; |
f865c3522 watchdog: add JZ4... |
157 |
|
85f6df149 watchdog: Convert... |
158 159 160 161 162 163 |
jz4740_wdt = &drvdata->wdt; jz4740_wdt->info = &jz4740_wdt_info; jz4740_wdt->ops = &jz4740_wdt_ops; jz4740_wdt->timeout = heartbeat; jz4740_wdt->min_timeout = 1; jz4740_wdt->max_timeout = MAX_HEARTBEAT; |
6551881c8 Watchdog: Fix par... |
164 |
jz4740_wdt->parent = &pdev->dev; |
85f6df149 watchdog: Convert... |
165 166 167 168 |
watchdog_set_nowayout(jz4740_wdt, nowayout); watchdog_set_drvdata(jz4740_wdt, drvdata); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
4c271bb67 watchdog: Convert... |
169 170 171 |
drvdata->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(drvdata->base)) { ret = PTR_ERR(drvdata->base); |
85f6df149 watchdog: Convert... |
172 |
goto err_out; |
f865c3522 watchdog: add JZ4... |
173 |
} |
5f314970b watchdog: jz4740:... |
174 |
drvdata->rtc_clk = clk_get(&pdev->dev, "rtc"); |
85f6df149 watchdog: Convert... |
175 176 177 178 179 |
if (IS_ERR(drvdata->rtc_clk)) { dev_err(&pdev->dev, "cannot find RTC clock "); ret = PTR_ERR(drvdata->rtc_clk); goto err_out; |
f865c3522 watchdog: add JZ4... |
180 |
} |
85f6df149 watchdog: Convert... |
181 182 |
ret = watchdog_register_device(&drvdata->wdt); if (ret < 0) |
f865c3522 watchdog: add JZ4... |
183 |
goto err_disable_clk; |
f865c3522 watchdog: add JZ4... |
184 |
|
85f6df149 watchdog: Convert... |
185 |
platform_set_drvdata(pdev, drvdata); |
f865c3522 watchdog: add JZ4... |
186 187 188 |
return 0; err_disable_clk: |
85f6df149 watchdog: Convert... |
189 190 |
clk_put(drvdata->rtc_clk); err_out: |
f865c3522 watchdog: add JZ4... |
191 192 |
return ret; } |
4b12b896c watchdog: remove ... |
193 |
static int jz4740_wdt_remove(struct platform_device *pdev) |
f865c3522 watchdog: add JZ4... |
194 |
{ |
85f6df149 watchdog: Convert... |
195 |
struct jz4740_wdt_drvdata *drvdata = platform_get_drvdata(pdev); |
f865c3522 watchdog: add JZ4... |
196 |
|
85f6df149 watchdog: Convert... |
197 198 199 |
jz4740_wdt_stop(&drvdata->wdt); watchdog_unregister_device(&drvdata->wdt); clk_put(drvdata->rtc_clk); |
f865c3522 watchdog: add JZ4... |
200 201 202 |
return 0; } |
f865c3522 watchdog: add JZ4... |
203 204 |
static struct platform_driver jz4740_wdt_driver = { .probe = jz4740_wdt_probe, |
82268714b watchdog: remove ... |
205 |
.remove = jz4740_wdt_remove, |
f865c3522 watchdog: add JZ4... |
206 207 |
.driver = { .name = "jz4740-wdt", |
6b96c7227 watchdog: jz4740:... |
208 |
.of_match_table = of_match_ptr(jz4740_wdt_of_matches), |
f865c3522 watchdog: add JZ4... |
209 210 |
}, }; |
b8ec61189 watchdog: convert... |
211 |
module_platform_driver(jz4740_wdt_driver); |
f865c3522 watchdog: add JZ4... |
212 213 214 |
MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>"); MODULE_DESCRIPTION("jz4740 Watchdog Driver"); |
f865c3522 watchdog: add JZ4... |
215 |
MODULE_LICENSE("GPL"); |
f865c3522 watchdog: add JZ4... |
216 |
MODULE_ALIAS("platform:jz4740-wdt"); |