On Wed, Apr 28, 2010 at 10:13:34AM +0200, Stefan Roese wrote:
>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 <s...@denx.de>
>Cc: Josh Boyer <jwbo...@linux.vnet.ibm.com>
>Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
>---
>v2:
>- Add small property description to Documentation
>- Add sanity check for property value
Thanks for the quick respin.
Acked-by: Josh Boyer <jwbo...@linux.vnet.ibm.com>
Ben, I don't have anything else pending for -next at the moment. Can you pick
this up yourself, or do you want me to create a pull request for just this
patch?
josh
>
> Documentation/powerpc/dts-bindings/4xx/reboot.txt | 18 +++++++++++++++
> arch/powerpc/sysdev/ppc4xx_soc.c | 24 +++++++++++++++++++-
> 2 files changed, 40 insertions(+), 2 deletions(-)
> create mode 100644 Documentation/powerpc/dts-bindings/4xx/reboot.txt
>
>diff --git a/Documentation/powerpc/dts-bindings/4xx/reboot.txt
>b/Documentation/powerpc/dts-bindings/4xx/reboot.txt
>new file mode 100644
>index 0000000..d721726
>--- /dev/null
>+++ b/Documentation/powerpc/dts-bindings/4xx/reboot.txt
>@@ -0,0 +1,18 @@
>+Reboot property to control system reboot on PPC4xx systems:
>+
>+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)
>+
>+Example:
>+
>+ c...@0 {
>+ device_type = "cpu";
>+ model = "PowerPC,440SPe";
>+ ...
>+ reset-type = <2>; /* Use chip-reset */
>+ };
>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 */
> }
>--
>1.7.1
>
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