1 files changed, 26 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/pervasive.c b/arch/powerpc/platforms/cell/pervasive.c
index 812bf563ed65..4ede22d363fa 100644
--- a/arch/powerpc/platforms/cell/pervasive.c
+++ b/arch/powerpc/platforms/cell/pervasive.c
@@ -38,6 +38,8 @@
 #include "pervasive.h"
 #include "cbe_regs.h"
 
+static int sysreset_hack;
+
 static void cbe_power_save(void)
 {
         unsigned long ctrl, thread_switch_control;
@@ -85,6 +87,9 @@ static void cbe_power_save(void)
 
 static int cbe_system_reset_exception(struct pt_regs *regs)
 {
+        int cpu;
+        struct cbe_pmd_regs __iomem *pmd;
+
         switch (regs->msr & SRR1_WAKEMASK) {
         case SRR1_WAKEEE:
                 do_IRQ(regs);
@@ -93,6 +98,18 @@ static int cbe_system_reset_exception(struct pt_regs *regs)
                 timer_interrupt(regs);
                 break;
         case SRR1_WAKEMT:
+                /*
+                 * The BMC can inject user triggered system reset exceptions,
+                 * but cannot set the system reset reason in srr1,
+                 * so check an extra register here.
+                 */
+                if (sysreset_hack && (cpu = smp_processor_id()) == 0) {
+                        pmd = cbe_get_cpu_pmd_regs(cpu);
+                        if (in_be64(&pmd->ras_esc_0) & 0xffff) {
+                                out_be64(&pmd->ras_esc_0, 0);
+                                return 0;
+                        }
+                }
                 break;
 #ifdef CONFIG_CBE_RAS
         case SRR1_WAKESYSERR:
@@ -113,9 +130,12 @@ static int cbe_system_reset_exception(struct pt_regs *regs)
 void __init cbe_pervasive_init(void)
 {
         int cpu;
+
         if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO))
                 return;
 
+        sysreset_hack = machine_is_compatible("IBM,CBPLUS-1.0");
+
         for_each_possible_cpu(cpu) {
                 struct cbe_pmd_regs __iomem *regs = cbe_get_cpu_pmd_regs(cpu);
                 if (!regs)
@@ -124,6 +144,12 @@ void __init cbe_pervasive_init(void)
                  /* Enable Pause(0) control bit */
                 out_be64(&regs->pmcr, in_be64(&regs->pmcr) |
                                             CBE_PMD_PAUSE_ZERO_CONTROL);
+
+                /* Enable JTAG system-reset hack */
+                if (sysreset_hack)
+                        out_be32(&regs->fir_mode_reg,
+                                in_be32(&regs->fir_mode_reg) |
+                                CBE_PMD_FIR_MODE_M8);
         }
 
         ppc_md.power_save = cbe_power_save;