powerpc/85xx: sbc8560 - Fix warm reboot with board specific reset function

The existing fsl_rstcr_restart function is not applicable to the
mpc8560. The Global Utilities Block on this earlier CPU doesn't have
the control/reset register at 0xe00b0.  This implements a board
specific reset function that uses the RCR(Reset Control Register) of
the sbc8560's EPLD to do a reset.

Signed-off-by: Liang Li <Liang.Li@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 38 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/85xx/sbc8560.c b/arch/powerpc/platforms/85xx/sbc8560.c
index cc27807a8b64..a5ad1c7794bf 100644
--- a/arch/powerpc/platforms/85xx/sbc8560.c
+++ b/arch/powerpc/platforms/85xx/sbc8560.c
@@ -267,6 +267,43 @@ arch_initcall(sbc8560_rtc_init);
 
 #endif  /* M48T59 */
 
+static __u8 __iomem *brstcr;
+
+static int __init sbc8560_bdrstcr_init(void)
+{
+        struct device_node *np;
+        struct resource res;
+
+        np = of_find_compatible_node(NULL, NULL, "wrs,sbc8560-brstcr");
+        if (np == NULL) {
+                printk(KERN_WARNING "sbc8560: No board specific RSTCR in DTB.\n");
+                return -ENODEV;
+        }
+
+        of_address_to_resource(np, 0, &res);
+
+        printk(KERN_INFO "sbc8560: Found BRSTCR at i/o 0x%x\n", res.start);
+
+        brstcr = ioremap(res.start, res.end - res.start);
+        if(!brstcr)
+                printk(KERN_WARNING "sbc8560: ioremap of brstcr failed.\n");
+
+        of_node_put(np);
+
+        return 0;
+}
+
+arch_initcall(sbc8560_bdrstcr_init);
+
+void sbc8560_rstcr_restart(char * cmd)
+{
+        local_irq_disable();
+        if(brstcr)
+                clrbits8(brstcr, 0x80);
+
+        while(1);
+}
+
 define_machine(sbc8560) {
         .name                   = "SBC8560",
         .probe                  = sbc8560_probe,
@@ -274,7 +311,7 @@ define_machine(sbc8560) {
         .init_IRQ               = sbc8560_pic_init,
         .show_cpuinfo           = sbc8560_show_cpuinfo,
         .get_irq                = mpic_get_irq,
-        .restart                = fsl_rstcr_restart,
+        .restart                = sbc8560_rstcr_restart,
         .calibrate_decr         = generic_calibrate_decr,
         .progress               = udbg_progress,
 };