diff options
| author | Graf Yang <graf.yang@analog.com> | 2009-01-07 23:14:39 +0800 |
|---|---|---|
| committer | Bryan Wu <cooloney@kernel.org> | 2009-01-07 23:14:39 +0800 |
| commit | d642a8ad55baee675b14dc4f36fc871a2588c7d1 (patch) | |
| tree | f8177b51ecaee947e7c6f63ff6c7f38f0299b52b | |
| parent | dbc895f95500a73ebf1ff12fe85f2e2b3790f52f (diff) | |
Blackfin arch: implement support for /proc/dma
Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
| -rw-r--r-- | arch/blackfin/kernel/bfin_dma_5xx.c | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c index a778bc80dc5..2625aa20a92 100644 --- a/arch/blackfin/kernel/bfin_dma_5xx.c +++ b/arch/blackfin/kernel/bfin_dma_5xx.c @@ -29,7 +29,9 @@ #include <linux/errno.h> #include <linux/module.h> +#include <linux/proc_fs.h> #include <linux/sched.h> +#include <linux/seq_file.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/param.h> @@ -67,26 +69,60 @@ static int __init blackfin_dma_init(void) mutex_init(&(dma_ch[i].dmalock)); } /* Mark MEMDMA Channel 0 as requested since we're using it internally */ - dma_ch[CH_MEM_STREAM0_DEST].chan_status = DMA_CHANNEL_REQUESTED; - dma_ch[CH_MEM_STREAM0_SRC].chan_status = DMA_CHANNEL_REQUESTED; + request_dma(CH_MEM_STREAM0_DEST, "Blackfin dma_memcpy"); + request_dma(CH_MEM_STREAM0_SRC, "Blackfin dma_memcpy"); #if defined(CONFIG_DEB_DMA_URGENT) bfin_write_EBIU_DDRQUE(bfin_read_EBIU_DDRQUE() | DEB1_URGENT | DEB2_URGENT | DEB3_URGENT); #endif + return 0; } - arch_initcall(blackfin_dma_init); +#ifdef CONFIG_PROC_FS + +static int proc_dma_show(struct seq_file *m, void *v) +{ + int i; + + for (i = 0 ; i < MAX_BLACKFIN_DMA_CHANNEL; ++i) + if (dma_ch[i].chan_status != DMA_CHANNEL_FREE) + seq_printf(m, "%2d: %s\n", i, dma_ch[i].device_id); + + return 0; +} + +static int proc_dma_open(struct inode *inode, struct file *file) +{ + return single_open(file, proc_dma_show, NULL); +} + +static const struct file_operations proc_dma_operations = { + .open = proc_dma_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init proc_dma_init(void) +{ + return proc_create("dma", 0, NULL, &proc_dma_operations) != NULL; +} +late_initcall(proc_dma_init); +#endif + /*------------------------------------------------------------------------------ * Request the specific DMA channel from the system. *-----------------------------------------------------------------------------*/ int request_dma(unsigned int channel, char *device_id) { - pr_debug("request_dma() : BEGIN \n"); + if (device_id == NULL) + printk(KERN_WARNING "request_dma(%u): no device_id given\n", channel); + #if defined(CONFIG_BF561) && ANOMALY_05000182 if (channel >= CH_IMEM_STREAM0_DEST && channel <= CH_IMEM_STREAM1_DEST) { if (get_cclk() > 500000000) { |