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 <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 71 insertions, 0 deletions

diff --git a/arch/mips/txx9/generic/setup.c b/arch/mips/txx9/generic/setup.c
index cfa3ccf493bb..118d716f7832 100644
--- a/arch/mips/txx9/generic/setup.c
+++ b/arch/mips/txx9/generic/setup.c
@@ -29,6 +29,7 @@
 #include <asm/r4kcache.h>
 #include <asm/txx9/generic.h>
 #include <asm/txx9/pci.h>
+#include <asm/txx9tmr.h>
 #ifdef CONFIG_CPU_TX49XX
 #include <asm/txx9/tx4938.h>
 #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 0840ef930e40..7189675f6a29 100644
--- a/arch/mips/txx9/generic/setup_tx4927.c
+++ b/arch/mips/txx9/generic/setup_tx4927.c
@@ -15,6 +15,7 @@
 #include <linux/delay.h>
 #include <linux/param.h>
 #include <linux/mtd/physmap.h>
+#include <asm/reboot.h>
 #include <asm/txx9irq.h>
 #include <asm/txx9tmr.h>
 #include <asm/txx9pio.h>
@@ -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 630a7aac61f6..4fbc85a8597f 100644
--- a/arch/mips/txx9/generic/setup_tx4938.c
+++ b/arch/mips/txx9/generic/setup_tx4938.c
@@ -15,6 +15,7 @@
 #include <linux/delay.h>
 #include <linux/param.h>
 #include <linux/mtd/physmap.h>
+#include <asm/reboot.h>
 #include <asm/txx9irq.h>
 #include <asm/txx9tmr.h>
 #include <asm/txx9pio.h>
@@ -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)