From 5751b9ba2e080880ed179be5b99b94c11f72e2aa Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Sat, 11 Nov 2006 17:25:04 +1100
Subject: [PATCH] [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>
---
arch/powerpc/platforms/cell/setup.c | 37 ++++++++++++++++++++++++++---
1 file changed, 34 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/platforms/cell/setup.c b/arch/powerpc/platforms/cell/setup.c
index d704bc19a6469..b39753f16d482 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;
--
2.39.5