Commit 76a7f404 authored by Enrik Berkhan's avatar Enrik Berkhan Committed by Bryan Wu

[Blackfin] arch: fix bug when DMA operation related core B of BF561

- Before DMA'ing data to core B L1 memory, caches have to be flushed.
- Before DMA'ing data from core B L1 memory, caches have to be invalidated.
- Fix lock/unlock.
Signed-off-by: default avatarEnrik Berkhan <Enrik.Berkhan@ge.com>
Signed-off-by: default avatarMike Frysinger <michael.frysinger@analog.com>
Signed-off-by: default avatarBryan Wu <bryan.wu@analog.com>
parent 37931db5
......@@ -33,7 +33,9 @@
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <asm/dma.h>
#include <asm/cacheflush.h>
#define MODULE_VER "v0.1"
......@@ -90,11 +92,12 @@ static ssize_t coreb_write(struct file *file, const char *buf, size_t count,
coreb_dma_done = 0;
flush_dcache_range((unsigned long)buf, (unsigned long)(buf+len));
/* Source Channel */
set_dma_start_addr(CH_MEM_STREAM2_SRC, (unsigned long)buf);
set_dma_x_count(CH_MEM_STREAM2_SRC, len);
set_dma_x_modify(CH_MEM_STREAM2_SRC, sizeof(char));
set_dma_config(CH_MEM_STREAM2_SRC, RESTART);
set_dma_config(CH_MEM_STREAM2_SRC, 0);
/* Destination Channel */
set_dma_start_addr(CH_MEM_STREAM2_DEST, coreb_base + p);
set_dma_x_count(CH_MEM_STREAM2_DEST, len);
......@@ -135,11 +138,12 @@ static ssize_t coreb_read(struct file *file, char *buf, size_t count,
coreb_dma_done = 0;
invalidate_dcache_range((unsigned long)buf, (unsigned long)(buf+len));
/* Source Channel */
set_dma_start_addr(CH_MEM_STREAM2_SRC, coreb_base + p);
set_dma_x_count(CH_MEM_STREAM2_SRC, len);
set_dma_x_modify(CH_MEM_STREAM2_SRC, sizeof(char));
set_dma_config(CH_MEM_STREAM2_SRC, RESTART);
set_dma_config(CH_MEM_STREAM2_SRC, 0);
/* Destination Channel */
set_dma_start_addr(CH_MEM_STREAM2_DEST, (unsigned long)buf);
set_dma_x_count(CH_MEM_STREAM2_DEST, len);
......@@ -266,7 +270,7 @@ static int coreb_ioctl(struct inode *inode, struct file *file,
coreb_status |= COREB_IS_RUNNING;
bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() & ~0x0020);
SSYNC();
spin_lock_irq(&coreb_lock);
spin_unlock_irq(&coreb_lock);
break;
#if defined(CONFIG_BF561_COREB_RESET)
case CMD_COREB_STOP:
......@@ -275,7 +279,7 @@ static int coreb_ioctl(struct inode *inode, struct file *file,
bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() | 0x0020);
bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
coreb_status &= ~COREB_IS_RUNNING;
spin_lock_irq(&coreb_lock);
spin_unlock_irq(&coreb_lock);
break;
case CMD_COREB_RESET:
printk(KERN_INFO "Resetting Core B\n");
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment