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https://github.com/torvalds/linux.git
synced 2026-06-10 07:32:29 +02:00
rk29: add watch dog driver
This commit is contained in:
hhb
parent
9631d0817c
commit
254d8a8277
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@ -1318,6 +1318,11 @@ static void __init rk29_board_iomux_init(void)
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}
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static struct platform_device *devices[] __initdata = {
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#ifdef CONFIG_RK29_WATCHDOG
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&rk29_device_wdt,
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#endif
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#ifdef CONFIG_UART1_RK29
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&rk29_device_uart1,
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#endif
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5
arch/arm/mach-rk29/board-rk29-phonesdk.c
Executable file → Normal file
5
arch/arm/mach-rk29/board-rk29-phonesdk.c
Executable file → Normal file
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@ -2557,6 +2557,11 @@ static void __init rk29_board_iomux_init(void)
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}
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static struct platform_device *devices[] __initdata = {
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#ifdef CONFIG_RK29_WATCHDOG
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&rk29_device_wdt,
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#endif
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#ifdef CONFIG_UART1_RK29
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&rk29_device_uart1,
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#endif
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@ -1374,6 +1374,11 @@ static void __init rk29_board_iomux_init(void)
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}
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static struct platform_device *devices[] __initdata = {
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#ifdef CONFIG_RK29_WATCHDOG
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&rk29_device_wdt,
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#endif
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#ifdef CONFIG_UART1_RK29
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&rk29_device_uart1,
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#endif
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@ -1323,6 +1323,11 @@ static void __init rk29_board_iomux_init(void)
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}
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static struct platform_device *devices[] __initdata = {
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#ifdef CONFIG_RK29_WATCHDOG
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&rk29_device_wdt,
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#endif
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#ifdef CONFIG_UART1_RK29
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&rk29_device_uart1,
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#endif
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30
arch/arm/mach-rk29/devices.c
Executable file → Normal file
30
arch/arm/mach-rk29/devices.c
Executable file → Normal file
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@ -283,6 +283,36 @@ struct platform_device rk29_device_sdmmc1 = {
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},
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};
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#endif
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/*
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* rk29 wdt device ADDED BY HHB@ROCK-CHIPS.COM
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*/
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#ifdef CONFIG_RK29_WATCHDOG
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static struct resource resources_wdt[] = {
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{
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.start = IRQ_WDT,
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.end = IRQ_WDT,
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.flags = IORESOURCE_IRQ,
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},
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{
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.start = RK29_WDT_PHYS,
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.end = RK29_WDT_PHYS + RK29_WDT_SIZE - 1,
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.flags = IORESOURCE_MEM,
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},
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};
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struct platform_device rk29_device_wdt = {
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.name = "rk29-wdt",
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.id = 0,
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.num_resources = ARRAY_SIZE(resources_wdt),
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.resource = resources_wdt,
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};
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#endif
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/*
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* rk29 4 uarts device
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*/
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2
arch/arm/mach-rk29/devices.h
Executable file → Normal file
2
arch/arm/mach-rk29/devices.h
Executable file → Normal file
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@ -76,4 +76,6 @@ extern struct platform_device rk29_device_rndis;
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extern struct platform_device rk29_device_vmac;
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extern struct rk29_vmac_platform_data rk29_vmac_pdata;
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extern struct platform_device rk29_device_ipp;
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extern struct platform_device rk29_device_wdt;
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#endif
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@ -73,6 +73,32 @@ config WM8350_WATCHDOG
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# ARM Architecture
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config RK29_WATCHDOG
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tristate "RK29 watchdog"
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depends on ARCH_RK29
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help
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Watchdog timer embedded into RK29xx chips. This will reboot your
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system when the timeout is reached.
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config RK29_FEED_DOG_BY_INTE
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bool "feed watchdog by interrupt"
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depends on RK29_WATCHDOG
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config RK29_WATCHDOG_ATBOOT
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bool "start watchdog at system boot"
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depends on RK29_WATCHDOG
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config RK29_WATCHDOG_DEFAULT_TIME
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int "set watchdog time out value (unit second)"
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depends on RK29_WATCHDOG
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help
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the real time out value is two times more than the setting value
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config RK29_WATCHDOG_DEBUG
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bool "enable watchdog debug"
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depends on RK29_WATCHDOG
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config AT91RM9200_WATCHDOG
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tristate "AT91RM9200 watchdog"
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depends on ARCH_AT91RM9200
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@ -46,6 +46,7 @@ obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
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obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
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obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
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obj-$(CONFIG_ADX_WATCHDOG) += adx_wdt.o
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obj-$(CONFIG_RK29_WATCHDOG) += rk29_wdt.o
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# AVR32 Architecture
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obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
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510
drivers/watchdog/rk29_wdt.c
Normal file
510
drivers/watchdog/rk29_wdt.c
Normal file
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@ -0,0 +1,510 @@
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/* linux/drivers/watchdog/rk29_wdt.c
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*
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* Copyright (C) 2011 ROCKCHIP, Inc.
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* hhb@rock-chips.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/timer.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/clk.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <asm/mach/map.h>
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/* RK29 registers define */
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#define RK29_WDT_CR 0X00
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#define RK29_WDT_TORR 0X04
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#define RK29_WDT_CCVR 0X08
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#define RK29_WDT_CRR 0X0C
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#define RK29_WDT_STAT 0X10
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#define RK29_WDT_EOI 0X14
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#define RK29_WDT_EN 1
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#define RK29_RESPONSE_MODE 1
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#define RK29_RESET_PULSE 4
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//THAT wdt's clock is 24MHZ
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#define RK29_WDT_2730US 0
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#define RK29_WDT_5460US 1
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#define RK29_WDT_10920US 2
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#define RK29_WDT_21840US 3
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#define RK29_WDT_43680US 4
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#define RK29_WDT_87360US 5
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#define RK29_WDT_174720US 6
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#define RK29_WDT_349440US 7
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#define RK29_WDT_698880US 8
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#define RK29_WDT_1397760US 9
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#define RK29_WDT_2795520US 10
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#define RK29_WDT_5591040US 11
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#define RK29_WDT_11182080US 12
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#define RK29_WDT_22364160US 13
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#define RK29_WDT_44728320US 14
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#define RK29_WDT_89456640US 15
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/*
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#define CONFIG_RK29_WATCHDOG_ATBOOT (1)
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#define CONFIG_RK29_WATCHDOG_DEFAULT_TIME 10 //unit second
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#define CONFIG_RK29_WATCHDOG_DEBUG 1
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*/
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static int nowayout = WATCHDOG_NOWAYOUT;
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static int tmr_margin = CONFIG_RK29_WATCHDOG_DEFAULT_TIME;
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#ifdef CONFIG_RK29_WATCHDOG_ATBOOT
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static int tmr_atboot = 1;
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#else
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static int tmr_atboot = 0;
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#endif
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static int soft_noboot;
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#ifdef CONFIG_RK29_WATCHDOG_DEBUG
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static int debug = 1;
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#else
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static int debug = 0;
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#endif
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module_param(tmr_margin, int, 0);
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module_param(tmr_atboot, int, 0);
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module_param(nowayout, int, 0);
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module_param(soft_noboot, int, 0);
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module_param(debug, int, 0);
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MODULE_PARM_DESC(tmr_margin, "Watchdog tmr_margin in seconds. default="
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__MODULE_STRING(CONFIG_RK29_WATCHDOG_DEFAULT_TIME) ")");
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MODULE_PARM_DESC(tmr_atboot,
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"Watchdog is started at boot time if set to 1, default="
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__MODULE_STRING(CONFIG_RK29_WATCHDOG_ATBOOT));
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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MODULE_PARM_DESC(soft_noboot, "Watchdog action, set to 1 to ignore reboots, "
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"0 to reboot (default depends on ONLY_TESTING)");
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MODULE_PARM_DESC(debug, "Watchdog debug, set to >1 for debug, (default 0)");
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static unsigned long open_lock;
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static struct device *wdt_dev; /* platform device attached to */
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static struct resource *wdt_mem;
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static struct resource *wdt_irq;
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static struct clk *wdt_clock;
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static void __iomem *wdt_base;
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static unsigned int wdt_count;
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static char expect_close;
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static DEFINE_SPINLOCK(wdt_lock);
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/* watchdog control routines */
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#define DBG(msg...) do { \
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if (debug) \
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printk(KERN_INFO msg); \
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} while (0)
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/* functions */
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static void rk29_wdt_keepalive(void)
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{
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spin_lock(&wdt_lock);
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writel(0x76, wdt_base + RK29_WDT_CRR);
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spin_unlock(&wdt_lock);
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}
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static void __rk29_wdt_stop(void)
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{
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unsigned long wtcon = 0;
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wtcon = readl(wdt_base + RK29_WDT_CR);
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wtcon &= 0xfffffffe;
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writel(wtcon, wdt_base + RK29_WDT_CR);
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}
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static void rk29_wdt_stop(void)
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{
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spin_lock(&wdt_lock);
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__rk29_wdt_stop();
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spin_unlock(&wdt_lock);
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}
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static void rk29_wdt_start(void)
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{
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unsigned long wtcon = 0;
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spin_lock(&wdt_lock);
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__rk29_wdt_stop();
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wtcon |= (RK29_WDT_EN << 0) | (RK29_RESPONSE_MODE << 1) | (RK29_RESET_PULSE << 2);
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writel(wtcon, wdt_base + RK29_WDT_CR);
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spin_unlock(&wdt_lock);
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}
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/* timeout unit us */
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static int rk29_wdt_set_heartbeat(int timeout)
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{
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unsigned int freq = clk_get_rate(wdt_clock);
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unsigned int count;
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unsigned int torr = 0;
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unsigned int acc = 1;
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if (timeout < 1)
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return -EINVAL;
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// freq /= 1000000;
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count = timeout * freq;
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count /= 0x10000;
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while(acc < count){
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acc *= 2;
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torr++;
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}
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if(torr > 15){
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torr = 15;
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}
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DBG("%s:%d\n", __func__, torr);
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writel(torr, wdt_base + RK29_WDT_TORR);
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return 0;
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}
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/*
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* /dev/watchdog handling
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*/
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static int rk29_wdt_open(struct inode *inode, struct file *file)
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{
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DBG("%s\n", __func__);
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if (test_and_set_bit(0, &open_lock))
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return -EBUSY;
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if (nowayout)
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__module_get(THIS_MODULE);
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expect_close = 0;
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/* start the timer */
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rk29_wdt_start();
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return nonseekable_open(inode, file);
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}
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static int rk29_wdt_release(struct inode *inode, struct file *file)
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{
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/*
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* Shut off the timer.
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* Lock it in if it's a module and we set nowayout
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*/
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DBG("%s\n", __func__);
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if (expect_close == 42)
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rk29_wdt_stop();
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else {
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dev_err(wdt_dev, "Unexpected close, not stopping watchdog\n");
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rk29_wdt_keepalive();
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}
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expect_close = 0;
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clear_bit(0, &open_lock);
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return 0;
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}
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static ssize_t rk29_wdt_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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/*
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* Refresh the timer.
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*/
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DBG("%s\n", __func__);
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if (len) {
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if (!nowayout) {
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size_t i;
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/* In case it was set long ago */
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expect_close = 0;
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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expect_close = 42;
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}
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}
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rk29_wdt_keepalive();
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}
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return len;
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}
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#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)
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static const struct watchdog_info rk29_wdt_ident = {
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.options = OPTIONS,
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.firmware_version = 0,
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.identity = "rk29 Watchdog",
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};
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static long rk29_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int new_margin;
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DBG("%s\n", __func__);
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &rk29_wdt_ident,
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sizeof(rk29_wdt_ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_KEEPALIVE:
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DBG("%s:rk29_wdt_keepalive\n", __func__);
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rk29_wdt_keepalive();
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_margin, p))
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return -EFAULT;
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if (rk29_wdt_set_heartbeat(new_margin))
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return -EINVAL;
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rk29_wdt_keepalive();
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return put_user(tmr_margin, p);
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case WDIOC_GETTIMEOUT:
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return put_user(tmr_margin, p);
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default:
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return -ENOTTY;
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}
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}
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/* kernel interface */
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static const struct file_operations rk29_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = rk29_wdt_write,
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.unlocked_ioctl = rk29_wdt_ioctl,
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.open = rk29_wdt_open,
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.release = rk29_wdt_release,
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};
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static struct miscdevice rk29_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &rk29_wdt_fops,
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};
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/* interrupt handler code */
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static irqreturn_t rk29_wdt_irq_handler(int irqno, void *param)
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{
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DBG("RK29_wdt:watchdog timer expired (irq)\n");
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rk29_wdt_keepalive();
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return IRQ_HANDLED;
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}
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/* device interface */
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static int __devinit rk29_wdt_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct device *dev;
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int started = 0;
|
||||
int ret;
|
||||
int size;
|
||||
|
||||
dev = &pdev->dev;
|
||||
wdt_dev = &pdev->dev;
|
||||
|
||||
/* get the memory region for the watchdog timer */
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (res == NULL) {
|
||||
dev_err(dev, "no memory resource specified\n");
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
size = (res->end - res->start) + 1;
|
||||
wdt_mem = request_mem_region(res->start, size, pdev->name);
|
||||
if (wdt_mem == NULL) {
|
||||
dev_err(dev, "failed to get memory region\n");
|
||||
ret = -ENOENT;
|
||||
goto err_req;
|
||||
}
|
||||
|
||||
wdt_base = ioremap(res->start, size);
|
||||
if (wdt_base == NULL) {
|
||||
dev_err(dev, "failed to ioremap() region\n");
|
||||
ret = -EINVAL;
|
||||
goto err_req;
|
||||
}
|
||||
|
||||
DBG("probe: mapped wdt_base=%p\n", wdt_base);
|
||||
|
||||
|
||||
#ifdef CONFIG_RK29_FEED_DOG_BY_INTE
|
||||
|
||||
wdt_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
||||
if (wdt_irq == NULL) {
|
||||
dev_err(dev, "no irq resource specified\n");
|
||||
ret = -ENOENT;
|
||||
goto err_map;
|
||||
}
|
||||
|
||||
ret = request_irq(wdt_irq->start, rk29_wdt_irq_handler, 0, pdev->name, pdev);
|
||||
|
||||
if (ret != 0) {
|
||||
dev_err(dev, "failed to install irq (%d)\n", ret);
|
||||
goto err_map;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
wdt_clock = clk_get(&pdev->dev, "wdt");
|
||||
if (IS_ERR(wdt_clock)) {
|
||||
dev_err(dev, "failed to find watchdog clock source\n");
|
||||
ret = PTR_ERR(wdt_clock);
|
||||
goto err_irq;
|
||||
}
|
||||
|
||||
clk_enable(wdt_clock);
|
||||
|
||||
rk29_wdt_set_heartbeat(tmr_margin);
|
||||
|
||||
ret = misc_register(&rk29_wdt_miscdev);
|
||||
if (ret) {
|
||||
dev_err(dev, "cannot register miscdev on minor=%d (%d)\n",
|
||||
WATCHDOG_MINOR, ret);
|
||||
goto err_clk;
|
||||
}
|
||||
printk("watchdog misc directory:%s\n", rk29_wdt_miscdev.nodename);
|
||||
if (tmr_atboot && started == 0) {
|
||||
dev_info(dev, "starting watchdog timer\n");
|
||||
rk29_wdt_start();
|
||||
} else if (!tmr_atboot) {
|
||||
/* if we're not enabling the watchdog, then ensure it is
|
||||
* disabled if it has been left running from the bootloader
|
||||
* or other source */
|
||||
|
||||
rk29_wdt_stop();
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
err_clk:
|
||||
clk_disable(wdt_clock);
|
||||
clk_put(wdt_clock);
|
||||
|
||||
err_irq:
|
||||
free_irq(wdt_irq->start, pdev);
|
||||
|
||||
err_map:
|
||||
iounmap(wdt_base);
|
||||
|
||||
err_req:
|
||||
release_resource(wdt_mem);
|
||||
kfree(wdt_mem);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit rk29_wdt_remove(struct platform_device *dev)
|
||||
{
|
||||
release_resource(wdt_mem);
|
||||
kfree(wdt_mem);
|
||||
wdt_mem = NULL;
|
||||
|
||||
free_irq(wdt_irq->start, dev);
|
||||
wdt_irq = NULL;
|
||||
|
||||
clk_disable(wdt_clock);
|
||||
clk_put(wdt_clock);
|
||||
wdt_clock = NULL;
|
||||
|
||||
iounmap(wdt_base);
|
||||
misc_deregister(&rk29_wdt_miscdev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void rk29_wdt_shutdown(struct platform_device *dev)
|
||||
{
|
||||
rk29_wdt_stop();
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
|
||||
static int rk29_wdt_suspend(struct platform_device *dev, pm_message_t state)
|
||||
{
|
||||
rk29_wdt_stop();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rk29_wdt_resume(struct platform_device *dev)
|
||||
{
|
||||
rk29_wdt_set_heartbeat(tmr_margin);
|
||||
rk29_wdt_start();
|
||||
return 0;
|
||||
}
|
||||
|
||||
#else
|
||||
#define rk29_wdt_suspend NULL
|
||||
#define rk29_wdt_resume NULL
|
||||
#endif /* CONFIG_PM */
|
||||
|
||||
|
||||
static struct platform_driver rk29_wdt_driver = {
|
||||
.probe = rk29_wdt_probe,
|
||||
.remove = __devexit_p(rk29_wdt_remove),
|
||||
.shutdown = rk29_wdt_shutdown,
|
||||
.suspend = rk29_wdt_suspend,
|
||||
.resume = rk29_wdt_resume,
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "rk29-wdt",
|
||||
},
|
||||
};
|
||||
|
||||
|
||||
static char banner[] __initdata =
|
||||
KERN_INFO "RK29 Watchdog Timer, (c) 2011 Rockchip Electronics\n";
|
||||
|
||||
static int __init watchdog_init(void)
|
||||
{
|
||||
printk(banner);
|
||||
return platform_driver_register(&rk29_wdt_driver);
|
||||
}
|
||||
|
||||
static void __exit watchdog_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&rk29_wdt_driver);
|
||||
}
|
||||
|
||||
module_init(watchdog_init);
|
||||
module_exit(watchdog_exit);
|
||||
|
||||
MODULE_AUTHOR("hhb@rock-chips.com");
|
||||
MODULE_DESCRIPTION("RK29 Watchdog Device Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||
MODULE_ALIAS("platform:rk29-wdt");
|
||||
Loading…
Reference in New Issue
Block a user