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author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-12-08 16:33:30 +0000 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-12-11 14:32:43 +0000 |
commit | 2f757f2ab7411cf0e2779012d8cda0cbf2f80d26 (patch) | |
tree | 880e0c661948132d54ce238eb45cba9bb71314d4 /arch/arm/mach-rpc | |
parent | 3afb6e9c635f735c751148beddc195daec0e35ec (diff) | |
download | linux-stable-2f757f2ab7411cf0e2779012d8cda0cbf2f80d26.tar.gz linux-stable-2f757f2ab7411cf0e2779012d8cda0cbf2f80d26.tar.bz2 linux-stable-2f757f2ab7411cf0e2779012d8cda0cbf2f80d26.zip |
[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/mach-rpc')
-rw-r--r-- | arch/arm/mach-rpc/dma.c | 68 |
1 files changed, 45 insertions, 23 deletions
diff --git a/arch/arm/mach-rpc/dma.c b/arch/arm/mach-rpc/dma.c index a86d3ed859a7..efcf6718d1d0 100644 --- a/arch/arm/mach-rpc/dma.c +++ b/arch/arm/mach-rpc/dma.c @@ -302,8 +302,22 @@ static struct dma_ops sound_dma_ops = { .disable = sound_enable_disable_dma, }; -void __init arch_dma_init(dma_t *dma) +static dma_t iomd_dma[6]; + +static dma_t floppy_dma = { + .dma_irq = FIQ_FLOPPYDATA, + .d_ops = &floppy_dma_ops, +}; + +static dma_t sound_dma = { + .d_ops = &sound_dma_ops, +}; + +static int __init rpc_dma_init(void) { + unsigned int i; + int ret; + iomd_writeb(0, IOMD_IO0CR); iomd_writeb(0, IOMD_IO1CR); iomd_writeb(0, IOMD_IO2CR); @@ -311,31 +325,39 @@ void __init arch_dma_init(dma_t *dma) iomd_writeb(0xa0, IOMD_DMATCR); - dma[DMA_0].dma_base = IOMD_IO0CURA; - dma[DMA_0].dma_irq = IRQ_DMA0; - dma[DMA_0].d_ops = &iomd_dma_ops; - dma[DMA_1].dma_base = IOMD_IO1CURA; - dma[DMA_1].dma_irq = IRQ_DMA1; - dma[DMA_1].d_ops = &iomd_dma_ops; - dma[DMA_2].dma_base = IOMD_IO2CURA; - dma[DMA_2].dma_irq = IRQ_DMA2; - dma[DMA_2].d_ops = &iomd_dma_ops; - dma[DMA_3].dma_base = IOMD_IO3CURA; - dma[DMA_3].dma_irq = IRQ_DMA3; - dma[DMA_3].d_ops = &iomd_dma_ops; - dma[DMA_S0].dma_base = IOMD_SD0CURA; - dma[DMA_S0].dma_irq = IRQ_DMAS0; - dma[DMA_S0].d_ops = &iomd_dma_ops; - dma[DMA_S1].dma_base = IOMD_SD1CURA; - dma[DMA_S1].dma_irq = IRQ_DMAS1; - dma[DMA_S1].d_ops = &iomd_dma_ops; - dma[DMA_VIRTUAL_FLOPPY].dma_irq = FIQ_FLOPPYDATA; - dma[DMA_VIRTUAL_FLOPPY].d_ops = &floppy_dma_ops; - dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops; - /* * Setup DMA channels 2,3 to be for podules * and channels 0,1 for internal devices */ iomd_writeb(DMA_EXT_IO3|DMA_EXT_IO2, IOMD_DMAEXT); + + iomd_dma[DMA_0].dma_base = IOMD_IO0CURA; + iomd_dma[DMA_0].dma_irq = IRQ_DMA0; + iomd_dma[DMA_1].dma_base = IOMD_IO1CURA; + iomd_dma[DMA_1].dma_irq = IRQ_DMA1; + iomd_dma[DMA_2].dma_base = IOMD_IO2CURA; + iomd_dma[DMA_2].dma_irq = IRQ_DMA2; + iomd_dma[DMA_3].dma_base = IOMD_IO3CURA; + iomd_dma[DMA_3].dma_irq = IRQ_DMA3; + iomd_dma[DMA_S0].dma_base = IOMD_SD0CURA; + iomd_dma[DMA_S0].dma_irq = IRQ_DMAS0; + iomd_dma[DMA_S1].dma_base = IOMD_SD1CURA; + iomd_dma[DMA_S1].dma_irq = IRQ_DMAS1; + + for (i = DMA_0; i <= DMA_S1; i++) { + iomd_dma[i].d_ops = &iomd_dma_ops; + + ret = isa_dma_add(i, &iomd_dma[i]); + if (ret) + printk("IOMDDMA%u: unable to register: %d\n", i, ret); + } + + ret = isa_dma_add(DMA_VIRTUAL_FLOPPY, &floppy_dma); + if (ret) + printk("IOMDFLOPPY: unable to register: %d\n", ret); + ret = isa_dma_add(DMA_VIRTUAL_SOUND, &sound_dma); + if (ret) + printk("IOMDSOUND: unable to register: %d\n", ret); + return 0; } +core_initcall(rpc_dma_init); |