[POWERPC] Add DMA ops support for of_platform_device to Cell

This patch adds a bus device notifier to the of_platform bus type on
cell to setup the DMA operations for of_platform_devices. We currently
use the PCI operations as Cell use a special version of them that
happens to be suitable for our needs.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 34 insertions, 3 deletions

diff --git a/arch/powerpc/platforms/cell/setup.c b/arch/powerpc/platforms/cell/setup.c
index d704bc19a646..b39753f16d48 100644
--- a/arch/powerpc/platforms/cell/setup.c
+++ b/arch/powerpc/platforms/cell/setup.c
@@ -30,6 +30,7 @@
 #include <linux/console.h>
 #include <linux/mutex.h>
 #include <linux/memory_hotplug.h>
+#include <linux/notifier.h>
 
 #include <asm/mmu.h>
 #include <asm/processor.h>
@@ -82,10 +83,41 @@ static void cell_progress(char *s, unsigned short hex)
         printk("*** %04x : %s\n", hex, s ? s : "");
 }
 
+static int cell_of_bus_notify(struct notifier_block *nb, unsigned long action,
+                              void *data)
+{
+        struct device *dev = data;
+
+        if (action != BUS_NOTIFY_ADD_DEVICE)
+                return 0;
+
+        /* For now, we just use the PCI DMA ops for everything, though
+         * we'll need something better when we have a real iommu
+         * implementation.
+         */
+        dev->archdata.dma_ops = pci_dma_ops;
+
+        return 0;
+}
+
+static struct notifier_block cell_of_bus_notifier = {
+        .notifier_call = cell_of_bus_notify
+};
+
+
 static int __init cell_publish_devices(void)
 {
-        if (machine_is(cell))
-                of_platform_bus_probe(NULL, NULL, NULL);
+        if (!machine_is(cell))
+                return 0;
+
+        /* Register callbacks on OF platform device addition/removal
+         * to handle linking them to the right DMA operations
+         */
+        bus_register_notifier(&of_platform_bus_type, &cell_of_bus_notifier);
+
+        /* Publish OF platform devices for southbridge IOs */
+        of_platform_bus_probe(NULL, NULL, NULL);
+
         return 0;
 }
 device_initcall(cell_publish_devices);
@@ -154,7 +186,6 @@ static void __init cell_setup_arch(void)
 #ifdef CONFIG_SMP
         smp_init_cell();
 #endif
-
         /* init to some ~sane value until calibrate_delay() runs */
         loops_per_jiffy = 50000000;