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powerpc: setup default archdata for {of_}platform via bus_register_notifier

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Since a number of powerpc chips are SoCs we end up having dma-able
devices that are registered as platform or of_platform devices.  We need
to hook the archdata to setup proper dma_ops for these devices.

Rather than having to add a bus_notify to each platform we add a default
one at the highest priority (called first) to set the default dma_ops for
of_platform and platform devices to dma_direct_ops.  This allows platform
code to override the ops by providing their own notifier call back.

In the future to enable >4G DMA support on ppc32 we can hook swiotlb ops.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kumar Gala
2009-03-19 03:40:51 +00:00
committed by Benjamin Herrenschmidt
parent 32ac57668d
commit d746286c1f
2 changed files with 36 additions and 13 deletions
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36
arch/powerpc/kernel/setup-common.c
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@@ -35,6 +35,8 @@
#include <linux/debugfs.h>
#include <linux/percpu.h>
#include <linux/lmb.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/processor.h>
@@ -669,3 +671,37 @@ static int powerpc_debugfs_init(void)
}
arch_initcall(powerpc_debugfs_init);
#endif
static int ppc_dflt_bus_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev = data;
/* We are only intereted in device addition */
if (action != BUS_NOTIFY_ADD_DEVICE)
return 0;
set_dma_ops(dev, &dma_direct_ops);
return NOTIFY_DONE;
}
static struct notifier_block ppc_dflt_plat_bus_notifier = {
.notifier_call = ppc_dflt_bus_notify,
.priority = INT_MAX,
};
static struct notifier_block ppc_dflt_of_bus_notifier = {
.notifier_call = ppc_dflt_bus_notify,
.priority = INT_MAX,
};
static int __init setup_bus_notifier(void)
{
bus_register_notifier(&platform_bus_type, &ppc_dflt_plat_bus_notifier);
bus_register_notifier(&of_platform_bus_type, &ppc_dflt_of_bus_notifier);
return 0;
}
arch_initcall(setup_bus_notifier);