From: Atsushi Nemoto Date: Tue, 19 Aug 2008 13:55:15 +0000 (+0900) Subject: MIPS: TXx9: Default machine_restart using watchdog reset X-Git-Tag: v2.6.28-rc1~719^2~36 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=496a3b5c2c188e8af07261792b3d4e6cf1c1dab9;p=linux-2.6-omap-h63xx.git MIPS: TXx9: Default machine_restart using watchdog reset Add default machine_restart routine using watchdog reset of TX4927 and TX4938. Signed-off-by: Atsushi Nemoto Signed-off-by: Ralf Baechle --- diff --git a/arch/mips/txx9/generic/setup.c b/arch/mips/txx9/generic/setup.c index cfa3ccf493b..118d716f783 100644 --- a/arch/mips/txx9/generic/setup.c +++ b/arch/mips/txx9/generic/setup.c @@ -29,6 +29,7 @@ #include #include #include +#include #ifdef CONFIG_CPU_TX49XX #include #endif @@ -444,6 +445,20 @@ void __init txx9_wdt_init(unsigned long base) platform_device_register_simple("txx9wdt", -1, &res, 1); } +void txx9_wdt_now(unsigned long base) +{ + struct txx9_tmr_reg __iomem *tmrptr = + ioremap(base, sizeof(struct txx9_tmr_reg)); + /* disable watch dog timer */ + __raw_writel(TXx9_TMWTMR_WDIS | TXx9_TMWTMR_TWC, &tmrptr->wtmr); + __raw_writel(0, &tmrptr->tcr); + /* kick watchdog */ + __raw_writel(TXx9_TMWTMR_TWIE, &tmrptr->wtmr); + __raw_writel(1, &tmrptr->cpra); /* immediate */ + __raw_writel(TXx9_TMTCR_TCE | TXx9_TMTCR_CCDE | TXx9_TMTCR_TMODE_WDOG, + &tmrptr->tcr); +} + /* SPI support */ void __init txx9_spi_init(int busid, unsigned long base, int irq) { diff --git a/arch/mips/txx9/generic/setup_tx4927.c b/arch/mips/txx9/generic/setup_tx4927.c index 0840ef930e4..7189675f6a2 100644 --- a/arch/mips/txx9/generic/setup_tx4927.c +++ b/arch/mips/txx9/generic/setup_tx4927.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -23,6 +24,10 @@ static void __init tx4927_wdr_init(void) { + /* report watchdog reset status */ + if (____raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_WDRST) + pr_warning("Watchdog reset detected at 0x%lx\n", + read_c0_errorepc()); /* clear WatchDogReset (W1C) */ tx4927_ccfg_set(TX4927_CCFG_WDRST); /* do reset on watchdog */ @@ -34,6 +39,27 @@ void __init tx4927_wdt_init(void) txx9_wdt_init(TX4927_TMR_REG(2) & 0xfffffffffULL); } +static void tx4927_machine_restart(char *command) +{ + local_irq_disable(); + pr_emerg("Rebooting (with %s watchdog reset)...\n", + (____raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_WDREXEN) ? + "external" : "internal"); + /* clear watchdog status */ + tx4927_ccfg_set(TX4927_CCFG_WDRST); /* W1C */ + txx9_wdt_now(TX4927_TMR_REG(2) & 0xfffffffffULL); + while (!(____raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_WDRST)) + ; + mdelay(10); + if (____raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_WDREXEN) { + pr_emerg("Rebooting (with internal watchdog reset)...\n"); + /* External WDRST failed. Do internal watchdog reset */ + tx4927_ccfg_clear(TX4927_CCFG_WDREXEN); + } + /* fallback */ + (*_machine_halt)(); +} + static struct resource tx4927_sdram_resource[4]; void __init tx4927_setup(void) @@ -169,6 +195,8 @@ void __init tx4927_setup(void) txx9_gpio_init(TX4927_PIO_REG & 0xfffffffffULL, 0, TX4927_NUM_PIO); __raw_writel(0, &tx4927_pioptr->maskcpu); __raw_writel(0, &tx4927_pioptr->maskext); + + _machine_restart = tx4927_machine_restart; } void __init tx4927_time_init(unsigned int tmrnr) diff --git a/arch/mips/txx9/generic/setup_tx4938.c b/arch/mips/txx9/generic/setup_tx4938.c index 630a7aac61f..4fbc85a8597 100644 --- a/arch/mips/txx9/generic/setup_tx4938.c +++ b/arch/mips/txx9/generic/setup_tx4938.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -23,6 +24,10 @@ static void __init tx4938_wdr_init(void) { + /* report watchdog reset status */ + if (____raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_WDRST) + pr_warning("Watchdog reset detected at 0x%lx\n", + read_c0_errorepc()); /* clear WatchDogReset (W1C) */ tx4938_ccfg_set(TX4938_CCFG_WDRST); /* do reset on watchdog */ @@ -34,6 +39,27 @@ void __init tx4938_wdt_init(void) txx9_wdt_init(TX4938_TMR_REG(2) & 0xfffffffffULL); } +static void tx4938_machine_restart(char *command) +{ + local_irq_disable(); + pr_emerg("Rebooting (with %s watchdog reset)...\n", + (____raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_WDREXEN) ? + "external" : "internal"); + /* clear watchdog status */ + tx4938_ccfg_set(TX4938_CCFG_WDRST); /* W1C */ + txx9_wdt_now(TX4938_TMR_REG(2) & 0xfffffffffULL); + while (!(____raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_WDRST)) + ; + mdelay(10); + if (____raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_WDREXEN) { + pr_emerg("Rebooting (with internal watchdog reset)...\n"); + /* External WDRST failed. Do internal watchdog reset */ + tx4938_ccfg_clear(TX4938_CCFG_WDREXEN); + } + /* fallback */ + (*_machine_halt)(); +} + static struct resource tx4938_sdram_resource[4]; static struct resource tx4938_sram_resource; @@ -229,6 +255,8 @@ void __init tx4938_setup(void) TX4938_CLKCTR_ETH1CKD); } } + + _machine_restart = tx4938_machine_restart; } void __init tx4938_time_init(unsigned int tmrnr) diff --git a/include/asm-mips/txx9/generic.h b/include/asm-mips/txx9/generic.h index 1982c4437b1..1e1a9f2d237 100644 --- a/include/asm-mips/txx9/generic.h +++ b/include/asm-mips/txx9/generic.h @@ -45,6 +45,7 @@ extern int (*txx9_irq_dispatch)(int pending); char *prom_getcmdline(void); const char *prom_getenv(const char *name); void txx9_wdt_init(unsigned long base); +void txx9_wdt_now(unsigned long base); void txx9_spi_init(int busid, unsigned long base, int irq); void txx9_ethaddr_init(unsigned int id, unsigned char *ethaddr); void txx9_sio_init(unsigned long baseaddr, int irq,