diff options
| -rw-r--r-- | arch/ppc/platforms/83xx/mpc834x_sys.h | 6 | ||||
| -rw-r--r-- | arch/ppc/syslib/ppc83xx_setup.c | 28 |
2 files changed, 34 insertions, 0 deletions
diff --git a/arch/ppc/platforms/83xx/mpc834x_sys.h b/arch/ppc/platforms/83xx/mpc834x_sys.h index 49db0f4c847..a2f6e49d715 100644 --- a/arch/ppc/platforms/83xx/mpc834x_sys.h +++ b/arch/ppc/platforms/83xx/mpc834x_sys.h @@ -28,6 +28,12 @@ #define BCSR_PHYS_ADDR ((uint)0xf8000000) #define BCSR_SIZE ((uint)(32 * 1024)) +#define BCSR_MISC_REG2_OFF 0x07 +#define BCSR_MISC_REG2_PORESET 0x01 + +#define BCSR_MISC_REG3_OFF 0x08 +#define BCSR_MISC_REG3_CNFLOCK 0x80 + #ifdef CONFIG_PCI /* PCI interrupt controller */ #define PIRQA MPC83xx_IRQ_IRQ4 diff --git a/arch/ppc/syslib/ppc83xx_setup.c b/arch/ppc/syslib/ppc83xx_setup.c index c28f9d67948..843cf8873e6 100644 --- a/arch/ppc/syslib/ppc83xx_setup.c +++ b/arch/ppc/syslib/ppc83xx_setup.c @@ -29,6 +29,7 @@ #include <asm/mmu.h> #include <asm/ppc_sys.h> #include <asm/kgdb.h> +#include <asm/delay.h> #include <syslib/ppc83xx_setup.h> @@ -117,7 +118,34 @@ mpc83xx_early_serial_map(void) void mpc83xx_restart(char *cmd) { + volatile unsigned char __iomem *reg; + unsigned char tmp; + + reg = ioremap(BCSR_PHYS_ADDR, BCSR_SIZE); + local_irq_disable(); + + /* + * Unlock the BCSR bits so a PRST will update the contents. + * Otherwise the reset asserts but doesn't clear. + */ + tmp = in_8(reg + BCSR_MISC_REG3_OFF); + tmp |= BCSR_MISC_REG3_CNFLOCK; /* low true, high false */ + out_8(reg + BCSR_MISC_REG3_OFF, tmp); + + /* + * Trigger a reset via a low->high transition of the + * PORESET bit. + */ + tmp = in_8(reg + BCSR_MISC_REG2_OFF); + tmp &= ~BCSR_MISC_REG2_PORESET; + out_8(reg + BCSR_MISC_REG2_OFF, tmp); + + udelay(1); + + tmp |= BCSR_MISC_REG2_PORESET; + out_8(reg + BCSR_MISC_REG2_OFF, tmp); + for(;;); } |