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author | Kumar Gala <galak@kernel.crashing.org> | 2009-03-19 03:40:51 (GMT) |
---|---|---|
committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-03-24 02:47:30 (GMT) |
commit | d746286c1fcb186ce16295c30d48db852ede6772 (patch) | |
tree | a851d7aa2b785004a4a1623bf6399f47ee80afdc /arch/powerpc/kernel/setup-common.c | |
parent | 32ac57668dccf6c4ad5522b61a86fe211886c180 (diff) | |
download | linux-fsl-qoriq-d746286c1fcb186ce16295c30d48db852ede6772.tar.xz |
powerpc: setup default archdata for {of_}platform via bus_register_notifier
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>
Diffstat (limited to 'arch/powerpc/kernel/setup-common.c')
-rw-r--r-- | arch/powerpc/kernel/setup-common.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c index 705fc4b..9774f9f 100644 --- a/arch/powerpc/kernel/setup-common.c +++ b/arch/powerpc/kernel/setup-common.c @@ -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); |