diff options
Diffstat (limited to 'arch/sh/drivers/dma/dma-sh.c')
| -rw-r--r-- | arch/sh/drivers/dma/dma-sh.c | 37 |
1 files changed, 24 insertions, 13 deletions
diff --git a/arch/sh/drivers/dma/dma-sh.c b/arch/sh/drivers/dma/dma-sh.c index afde2a7d3..e0679d8a9 100644 --- a/arch/sh/drivers/dma/dma-sh.c +++ b/arch/sh/drivers/dma/dma-sh.c @@ -22,6 +22,18 @@ #include <cpu/dma.h> /* + * Some of the SoCs feature two DMAC modules. In such a case, the channels are + * distributed equally among them. + */ +#ifdef SH_DMAC_BASE1 +#define SH_DMAC_NR_MD_CH (CONFIG_NR_ONCHIP_DMA_CHANNELS / 2) +#else +#define SH_DMAC_NR_MD_CH CONFIG_NR_ONCHIP_DMA_CHANNELS +#endif + +#define SH_DMAC_CH_SZ 0x10 + +/* * Define the default configuration for dual address memory-memory transfer. * The 0x400 value represents auto-request, external->external. */ @@ -32,7 +44,7 @@ static unsigned long dma_find_base(unsigned int chan) unsigned long base = SH_DMAC_BASE0; #ifdef SH_DMAC_BASE1 - if (chan >= 6) + if (chan >= SH_DMAC_NR_MD_CH) base = SH_DMAC_BASE1; #endif @@ -43,13 +55,13 @@ static unsigned long dma_base_addr(unsigned int chan) { unsigned long base = dma_find_base(chan); - /* Normalize offset calculation */ - if (chan >= 9) - chan -= 6; - if (chan >= 4) - base += 0x10; + chan = (chan % SH_DMAC_NR_MD_CH) * SH_DMAC_CH_SZ; + + /* DMAOR is placed inside the channel register space. Step over it. */ + if (chan >= DMAOR) + base += SH_DMAC_CH_SZ; - return base + (chan * 0x10); + return base + chan; } #ifdef CONFIG_SH_DMA_IRQ_MULTI @@ -253,12 +265,11 @@ static int sh_dmac_get_dma_residue(struct dma_channel *chan) #define NR_DMAOR 1 #endif -/* - * DMAOR bases are broken out amongst channel groups. DMAOR0 manages - * channels 0 - 5, DMAOR1 6 - 11 (optional). - */ -#define dmaor_read_reg(n) __raw_readw(dma_find_base((n)*6)) -#define dmaor_write_reg(n, data) __raw_writew(data, dma_find_base(n)*6) +#define dmaor_read_reg(n) __raw_readw(dma_find_base((n) * \ + SH_DMAC_NR_MD_CH) + DMAOR) +#define dmaor_write_reg(n, data) __raw_writew(data, \ + dma_find_base((n) * \ + SH_DMAC_NR_MD_CH) + DMAOR) static inline int dmaor_reset(int no) { |