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author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-12-08 16:33:30 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-12-11 14:32:43 (GMT) |
commit | 2f757f2ab7411cf0e2779012d8cda0cbf2f80d26 (patch) | |
tree | 880e0c661948132d54ce238eb45cba9bb71314d4 /arch/arm/kernel/dma-isa.c | |
parent | 3afb6e9c635f735c751148beddc195daec0e35ec (diff) | |
download | linux-2f757f2ab7411cf0e2779012d8cda0cbf2f80d26.tar.xz |
[ARM] dma: rejig DMA initialization
Rather than having the central DMA multiplexer call the architecture
specific DMA initialization function, have each architecture DMA
initialization function use core_initcall(), and register each DMA
channel separately with the multiplexer.
This removes the array of dma structures in the central multiplexer,
replacing it with an array of pointers instead; this is more flexible
since it allows the drivers to wrap the DMA structure (eventually
allowing us to transition non-ISA DMA drivers away.)
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/dma-isa.c')
-rw-r--r-- | arch/arm/kernel/dma-isa.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/arch/arm/kernel/dma-isa.c b/arch/arm/kernel/dma-isa.c index 29eca48..da02a7f 100644 --- a/arch/arm/kernel/dma-isa.c +++ b/arch/arm/kernel/dma-isa.c @@ -160,7 +160,12 @@ static struct resource dma_resources[] = { { .end = 0x048f } }; -void __init isa_init_dma(dma_t *dma) +static dma_t isa_dma[8]; + +/* + * ISA DMA always starts at channel 0 + */ +void __init isa_init_dma(void) { /* * Try to autodetect presence of an ISA DMA controller. @@ -178,10 +183,10 @@ void __init isa_init_dma(dma_t *dma) outb(0xaa, 0x00); if (inb(0) == 0x55 && inb(0) == 0xaa) { - int chan, i; + unsigned int chan, i; for (chan = 0; chan < 8; chan++) { - dma[chan].d_ops = &isa_dma_ops; + isa_dma[chan].d_ops = &isa_dma_ops; isa_disable_dma(chan, NULL); } @@ -217,5 +222,12 @@ void __init isa_init_dma(dma_t *dma) for (i = 0; i < ARRAY_SIZE(dma_resources); i++) request_resource(&ioport_resource, dma_resources + i); + + for (chan = 0; chan < 8; chan++) { + int ret = isa_dma_add(chan, &isa_dma[chan]); + if (ret) + printk(KERN_ERR "ISADMA%u: unable to register: %d\n", + chan, ret); + } } } |