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-rw-r--r--arch/arm/plat-s3c24xx/dma.c26
-rw-r--r--include/asm-arm/arch-s3c2410/dma.h1
2 files changed, 26 insertions, 1 deletions
diff --git a/arch/arm/plat-s3c24xx/dma.c b/arch/arm/plat-s3c24xx/dma.c
index 10ef3995b11..68ce89db17d 100644
--- a/arch/arm/plat-s3c24xx/dma.c
+++ b/arch/arm/plat-s3c24xx/dma.c
@@ -1173,6 +1173,7 @@ int s3c2410_dma_devconfig(int channel,
chan->source = source;
chan->dev_addr = devaddr;
+ chan->hw_cfg = hwcfg;
switch (source) {
case S3C2410_DMASRC_HW:
@@ -1235,6 +1236,10 @@ int s3c2410_dma_getposition(dmach_t channel, dma_addr_t *src, dma_addr_t *dst)
EXPORT_SYMBOL(s3c2410_dma_getposition);
+static struct s3c2410_dma_chan *to_dma_chan(struct sys_device *dev)
+{
+ return container_of(dev, struct s3c2410_dma_chan, dev);
+}
/* system device class */
@@ -1242,7 +1247,7 @@ EXPORT_SYMBOL(s3c2410_dma_getposition);
static int s3c2410_dma_suspend(struct sys_device *dev, pm_message_t state)
{
- struct s3c2410_dma_chan *cp = container_of(dev, struct s3c2410_dma_chan, dev);
+ struct s3c2410_dma_chan *cp = to_dma_chan(dev);
printk(KERN_DEBUG "suspending dma channel %d\n", cp->number);
@@ -1264,6 +1269,24 @@ static int s3c2410_dma_suspend(struct sys_device *dev, pm_message_t state)
static int s3c2410_dma_resume(struct sys_device *dev)
{
+ struct s3c2410_dma_chan *cp = to_dma_chan(dev);
+ unsigned int no = cp->number | DMACH_LOW_LEVEL;
+
+ /* restore channel's hardware configuration */
+
+ if (!cp->in_use)
+ return 0;
+
+ printk(KERN_INFO "dma%d: restoring configuration\n", cp->number);
+
+ s3c2410_dma_config(no, cp->xfer_unit, cp->dcon);
+ s3c2410_dma_devconfig(no, cp->source, cp->hw_cfg, cp->dev_addr);
+
+ /* re-select the dma source for this channel */
+
+ if (cp->map != NULL)
+ dma_sel.select(cp, cp->map);
+
return 0;
}
@@ -1453,6 +1476,7 @@ static struct s3c2410_dma_chan *s3c2410_dma_map_channel(int channel)
found:
dmach = &s3c2410_chans[ch];
+ dmach->map = ch_map;
dma_chan_map[channel] = dmach;
/* select the channel */
diff --git a/include/asm-arm/arch-s3c2410/dma.h b/include/asm-arm/arch-s3c2410/dma.h
index c6e8d8f6493..4f291d9b7d9 100644
--- a/include/asm-arm/arch-s3c2410/dma.h
+++ b/include/asm-arm/arch-s3c2410/dma.h
@@ -214,6 +214,7 @@ struct s3c2410_dma_chan {
unsigned long dev_addr;
unsigned long load_timeout;
unsigned int flags; /* channel flags */
+ unsigned int hw_cfg; /* last hw config */
struct s3c24xx_dma_map *map; /* channel hw maps */