[SPARC64]: Probe virtual-devices root node on sun4v.

This is where we learn how to get the interrupts
for things like the hypervisor console device.

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

1 files changed, 58 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/devices.c b/arch/sparc64/kernel/devices.c
index ac11d872ef74..817132826e09 100644
--- a/arch/sparc64/kernel/devices.c
+++ b/arch/sparc64/kernel/devices.c
@@ -12,6 +12,7 @@
 #include <linux/string.h>
 #include <linux/spinlock.h>
 #include <linux/errno.h>
+#include <linux/bootmem.h>
 
 #include <asm/page.h>
 #include <asm/oplib.h>
@@ -20,6 +21,7 @@
 #include <asm/spitfire.h>
 #include <asm/timer.h>
 #include <asm/cpudata.h>
+#include <asm/vdev.h>
 
 /* Used to synchronize acceses to NatSemi SUPER I/O chip configure
  * operations in asm/ns87303.h
@@ -29,6 +31,61 @@ DEFINE_SPINLOCK(ns87303_lock);
 extern void cpu_probe(void);
 extern void central_probe(void);
 
+u32 sun4v_vdev_devhandle;
+int sun4v_vdev_root;
+struct linux_prom_pci_intmap *sun4v_vdev_intmap;
+int sun4v_vdev_num_intmap;
+struct linux_prom_pci_intmap sun4v_vdev_intmask;
+
+static void __init sun4v_virtual_device_probe(void)
+{
+        struct linux_prom64_registers regs;
+        struct linux_prom_pci_intmap *ip;
+        int node, sz, err;
+
+        if (tlb_type != hypervisor)
+                return;
+
+        node = prom_getchild(prom_root_node);
+        node = prom_searchsiblings(node, "virtual-devices");
+        if (!node) {
+                prom_printf("SUN4V: Fatal error, no virtual-devices node.\n");
+                prom_halt();
+        }
+
+        sun4v_vdev_root = node;
+
+        prom_getproperty(node, "reg", (char *)&regs, sizeof(regs));
+        sun4v_vdev_devhandle = (regs.phys_addr >> 32UL) & 0x0fffffff;
+
+        sz = sizeof(*ip) * 64;
+        sun4v_vdev_intmap = ip = alloc_bootmem_low_pages(sz);
+        if (!sun4v_vdev_intmap) {
+                prom_printf("SUN4V: Error, cannot allocate vdev intmap.\n");
+                prom_halt();
+        }
+
+        err = prom_getproperty(node, "interrupt-map", (char *) ip, sz);
+        if (err == -1) {
+                prom_printf("SUN4V: Fatal error, no vdev interrupt-map.\n");
+                prom_halt();
+        }
+
+        sun4v_vdev_num_intmap = err / sizeof(*ip);
+
+        err = prom_getproperty(node, "interrupt-map-mask",
+                               (char *) &sun4v_vdev_intmask,
+                               sizeof(sun4v_vdev_intmask));
+        if (err == -1) {
+                prom_printf("SUN4V: Fatal error, no vdev "
+                            "interrupt-map-mask.\n");
+                prom_halt();
+        }
+
+        printk("SUN4V: virtual-devices devhandle[%x]\n",
+               sun4v_vdev_devhandle);
+}
+
 static const char *cpu_mid_prop(void)
 {
         if (tlb_type == spitfire)
@@ -177,6 +234,7 @@ void __init device_scan(void)
         }
 #endif
 
+        sun4v_virtual_device_probe();
         central_probe();
 
         cpu_probe();