diff options
| author | Kumar Gala <galak@freescale.com> | 2005-05-28 15:52:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-28 16:46:16 -0700 |
| commit | f9e4a005827ec0b33f0c61fec1634a5a3421decd (patch) | |
| tree | b0c90680abd6d4b9f7423a7dd935d20b65ee30ee /arch/ppc/syslib/ppc83xx_setup.c | |
| parent | ff945023c6a455679165b14d298316e262ceeb1f (diff) | |
| download | linux-f9e4a005827ec0b33f0c61fec1634a5a3421decd.tar.bz2 | |
[PATCH] ppc32: Add soft reset to MPC834x
This change allows mpc83xx_restart to issue a software reset.
Signed-off-by: Randy Vinson <rvinson@mvista.com>
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ppc/syslib/ppc83xx_setup.c')
| -rw-r--r-- | arch/ppc/syslib/ppc83xx_setup.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/ppc/syslib/ppc83xx_setup.c b/arch/ppc/syslib/ppc83xx_setup.c index c28f9d679484..843cf8873e60 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(;;); } |