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Blackfin arch: implement support for /proc/dma

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Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Graf Yang 2009-01-07 23:14:39 +08:00 committed by Bryan Wu
parent dbc895f955
commit d642a8ad55
1 changed files with 40 additions and 4 deletions
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44
arch/blackfin/kernel/bfin_dma_5xx.c
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@ -29,7 +29,9 @@
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/param.h> #include <linux/param.h>
@ -67,26 +69,60 @@ static int __init blackfin_dma_init(void)
mutex_init(&(dma_ch[i].dmalock)); mutex_init(&(dma_ch[i].dmalock));
} }
/* Mark MEMDMA Channel 0 as requested since we're using it internally */ /* Mark MEMDMA Channel 0 as requested since we're using it internally */
dma_ch[CH_MEM_STREAM0_DEST].chan_status = DMA_CHANNEL_REQUESTED; request_dma(CH_MEM_STREAM0_DEST, "Blackfin dma_memcpy");
dma_ch[CH_MEM_STREAM0_SRC].chan_status = DMA_CHANNEL_REQUESTED; request_dma(CH_MEM_STREAM0_SRC, "Blackfin dma_memcpy");
#if defined(CONFIG_DEB_DMA_URGENT) #if defined(CONFIG_DEB_DMA_URGENT)
bfin_write_EBIU_DDRQUE(bfin_read_EBIU_DDRQUE() bfin_write_EBIU_DDRQUE(bfin_read_EBIU_DDRQUE()
| DEB1_URGENT | DEB2_URGENT | DEB3_URGENT); | DEB1_URGENT | DEB2_URGENT | DEB3_URGENT);
#endif #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; return 0;
} }
arch_initcall(blackfin_dma_init); 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. * Request the specific DMA channel from the system.
*-----------------------------------------------------------------------------*/ *-----------------------------------------------------------------------------*/
int request_dma(unsigned int channel, char *device_id) int request_dma(unsigned int channel, char *device_id)
{ {
pr_debug("request_dma() : BEGIN \n"); 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 defined(CONFIG_BF561) && ANOMALY_05000182
if (channel >= CH_IMEM_STREAM0_DEST && channel <= CH_IMEM_STREAM1_DEST) { if (channel >= CH_IMEM_STREAM0_DEST && channel <= CH_IMEM_STREAM1_DEST) {
if (get_cclk() > 500000000) { if (get_cclk() > 500000000) {