diff options
| author | Stefan Roese <sr@denx.de> | 2010-04-27 22:13:34 +0000 |
|---|---|---|
| committer | Josh Boyer <jwboyer@linux.vnet.ibm.com> | 2010-05-05 12:51:54 -0400 |
| commit | a32fe93daf9c6b6ffbab1d9b9e2a8e4c335bda5c (patch) | |
| tree | 66a68d8817ba3c86f1f38ee2cd1b5f92a9d56076 /arch | |
| parent | 101c192e1163c1c7e8d29748108b582929975038 (diff) | |
| download | kernel_samsung_aries-a32fe93daf9c6b6ffbab1d9b9e2a8e4c335bda5c.zip kernel_samsung_aries-a32fe93daf9c6b6ffbab1d9b9e2a8e4c335bda5c.tar.gz kernel_samsung_aries-a32fe93daf9c6b6ffbab1d9b9e2a8e4c335bda5c.tar.bz2 | |
powerpc/4xx: Add optional "reset_type" property to control reboot via dts
By setting "reset_type" to one of the following values, the default
software reset mechanism may be overidden. Here the possible values of
"reset_type":
1 - PPC4xx core reset
2 - PPC4xx chip reset
3 - PPC4xx system reset (default)
This will be used by a new PPC440SPe board port, which needs a "chip
reset" instead of the default "system reset" to be asserted.
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/sysdev/ppc4xx_soc.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/arch/powerpc/sysdev/ppc4xx_soc.c b/arch/powerpc/sysdev/ppc4xx_soc.c index 5c01435..d3d6ce3 100644 --- a/arch/powerpc/sysdev/ppc4xx_soc.c +++ b/arch/powerpc/sysdev/ppc4xx_soc.c @@ -191,11 +191,31 @@ static int __init ppc4xx_l2c_probe(void) arch_initcall(ppc4xx_l2c_probe); /* - * At present, this routine just applies a system reset. + * Apply a system reset. Alternatively a board specific value may be + * provided via the "reset-type" property in the cpu node. */ void ppc4xx_reset_system(char *cmd) { - mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_RST_SYSTEM); + struct device_node *np; + u32 reset_type = DBCR0_RST_SYSTEM; + const u32 *prop; + + np = of_find_node_by_type(NULL, "cpu"); + if (np) { + prop = of_get_property(np, "reset-type", NULL); + + /* + * Check if property exists and if it is in range: + * 1 - PPC4xx core reset + * 2 - PPC4xx chip reset + * 3 - PPC4xx system reset (default) + */ + if ((prop) && ((prop[0] >= 1) && (prop[0] <= 3))) + reset_type = prop[0] << 28; + } + + mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | reset_type); + while (1) ; /* Just in case the reset doesn't work */ } |