diff options
| author | steven miao <realmz6@gmail.com> | 2010-10-22 08:48:41 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2011-03-18 03:49:23 -0400 |
| commit | 55835175a03392d2e4d9bff9d482312d118f304e (patch) | |
| tree | 51157bc604b5c5baa917bd22f420fa6291d5da76 /arch/blackfin/kernel | |
| parent | 6ce0466d631d40662e2ab9ec5a05019482bd1074 (diff) | |
| download | linux-55835175a03392d2e4d9bff9d482312d118f304e.tar.bz2 | |
Blackfin: bf54x: add kconfig for UART2/3 DMA channel assignments
The BF54x lacks dedicated DMA channels for the UART peripherals and need
to be muxed between others. So add a kconfig option so people can select
which channels the UARTs will use so they can pick between SPORTs and the
less commonly used EPPI/PIXC peripherals.
Signed-off-by: steven miao <realmz6@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/kernel')
| -rw-r--r-- | arch/blackfin/kernel/bfin_dma_5xx.c | 32 |
1 files changed, 19 insertions, 13 deletions
diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c index 1e485dfdc9f2..6ce8dce753c9 100644 --- a/arch/blackfin/kernel/bfin_dma_5xx.c +++ b/arch/blackfin/kernel/bfin_dma_5xx.c @@ -84,6 +84,24 @@ static int __init proc_dma_init(void) late_initcall(proc_dma_init); #endif +static void set_dma_peripheral_map(unsigned int channel, const char *device_id) +{ +#ifdef CONFIG_BF54x + unsigned int per_map; + + switch (channel) { + case CH_UART2_RX: per_map = 0xC << 12; break; + case CH_UART2_TX: per_map = 0xD << 12; break; + case CH_UART3_RX: per_map = 0xE << 12; break; + case CH_UART3_TX: per_map = 0xF << 12; break; + default: return; + } + + if (strncmp(device_id, "BFIN_UART", 9) == 0) + dma_ch[channel].regs->peripheral_map = per_map; +#endif +} + /** * request_dma - request a DMA channel * @@ -111,19 +129,7 @@ int request_dma(unsigned int channel, const char *device_id) return -EBUSY; } -#ifdef CONFIG_BF54x - if (channel >= CH_UART2_RX && channel <= CH_UART3_TX) { - unsigned int per_map; - per_map = dma_ch[channel].regs->peripheral_map & 0xFFF; - if (strncmp(device_id, "BFIN_UART", 9) == 0) - dma_ch[channel].regs->peripheral_map = per_map | - ((channel - CH_UART2_RX + 0xC)<<12); - else - dma_ch[channel].regs->peripheral_map = per_map | - ((channel - CH_UART2_RX + 0x6)<<12); - } -#endif - + set_dma_peripheral_map(channel, device_id); dma_ch[channel].device_id = device_id; dma_ch[channel].irq = 0; |