[SPARC64]: Fix Tomatillo/Schizo IRQ handling.

The code in schizo_irq_trans_init() should set irq_data->sync_reg
to the location of the SYNC register if this is Tomatillo, and set
it to zero otherwise.  But that is not what it is doing.

As a result, non-Tomatillo systems were trying to access a
non-existent register resulting in bus errors at the first
PCI interrupt.

Thanks to Roland Stigge for the bug report.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 4 deletions

diff --git a/arch/sparc64/kernel/prom.c b/arch/sparc64/kernel/prom.c
index c60efb3cb22e..0917c24c4f08 100644
--- a/arch/sparc64/kernel/prom.c
+++ b/arch/sparc64/kernel/prom.c
@@ -793,7 +793,7 @@ static unsigned int schizo_irq_build(struct device_node *dp,
         return virt_irq;
 }
 
-static void schizo_irq_trans_init(struct device_node *dp)
+static void __schizo_irq_trans_init(struct device_node *dp, int is_tomatillo)
 {
         struct linux_prom64_registers *regs;
         struct schizo_irq_data *irq_data;
@@ -807,11 +807,24 @@ static void schizo_irq_trans_init(struct device_node *dp)
         dp->irq_trans->data = irq_data;
 
         irq_data->pbm_regs = regs[0].phys_addr;
-        irq_data->sync_reg = regs[3].phys_addr + 0x1a18UL;
+        if (is_tomatillo)
+                irq_data->sync_reg = regs[3].phys_addr + 0x1a18UL;
+        else
+                irq_data->sync_reg = 0UL;
         irq_data->portid = of_getintprop_default(dp, "portid", 0);
         irq_data->chip_version = of_getintprop_default(dp, "version#", 0);
 }
 
+static void schizo_irq_trans_init(struct device_node *dp)
+{
+        __schizo_irq_trans_init(dp, 0);
+}
+
+static void tomatillo_irq_trans_init(struct device_node *dp)
+{
+        __schizo_irq_trans_init(dp, 1);
+}
+
 static unsigned int pci_sun4v_irq_build(struct device_node *dp,
                                         unsigned int devino,
                                         void *_data)
@@ -1050,8 +1063,8 @@ static struct irq_trans pci_irq_trans_table[] = {
         { "pci108e,8001", schizo_irq_trans_init },
         { "SUNW,schizo+", schizo_irq_trans_init },
         { "pci108e,8002", schizo_irq_trans_init },
-        { "SUNW,tomatillo", schizo_irq_trans_init },
-        { "pci108e,a801", schizo_irq_trans_init },
+        { "SUNW,tomatillo", tomatillo_irq_trans_init },
+        { "pci108e,a801", tomatillo_irq_trans_init },
         { "SUNW,sun4v-pci", pci_sun4v_irq_trans_init },
 };
 #endif