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path: root/arch/arm/plat-s3c24xx/dma.c
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Diffstat (limited to 'arch/arm/plat-s3c24xx/dma.c')
-rw-r--r--arch/arm/plat-s3c24xx/dma.c47
1 files changed, 40 insertions, 7 deletions
diff --git a/arch/arm/plat-s3c24xx/dma.c b/arch/arm/plat-s3c24xx/dma.c
index aae1b9cbaf4..ac9ff1666fc 100644
--- a/arch/arm/plat-s3c24xx/dma.c
+++ b/arch/arm/plat-s3c24xx/dma.c
@@ -525,7 +525,8 @@ int s3c2410_dma_enqueue(unsigned int channel, void *id,
}
} else if (chan->state == S3C2410_DMA_IDLE) {
if (chan->flags & S3C2410_DMAF_AUTOSTART) {
- s3c2410_dma_ctrl(chan->number, S3C2410_DMAOP_START);
+ s3c2410_dma_ctrl(chan->number | DMACH_LOW_LEVEL,
+ S3C2410_DMAOP_START);
}
}
@@ -787,7 +788,7 @@ int s3c2410_dma_request(unsigned int channel,
pr_debug("%s: channel initialised, %p\n", __FUNCTION__, chan);
- return 0;
+ return chan->number | DMACH_LOW_LEVEL;
}
EXPORT_SYMBOL(s3c2410_dma_request);
@@ -1173,6 +1174,7 @@ int s3c2410_dma_devconfig(int channel,
chan->source = source;
chan->dev_addr = devaddr;
+ chan->hw_cfg = hwcfg;
switch (source) {
case S3C2410_DMASRC_HW:
@@ -1184,7 +1186,7 @@ int s3c2410_dma_devconfig(int channel,
dma_wrreg(chan, S3C2410_DMA_DIDSTC, (0<<1) | (0<<0));
chan->addr_reg = dma_regaddr(chan, S3C2410_DMA_DIDST);
- return 0;
+ break;
case S3C2410_DMASRC_MEM:
/* source is memory */
@@ -1195,11 +1197,19 @@ int s3c2410_dma_devconfig(int channel,
dma_wrreg(chan, S3C2410_DMA_DIDSTC, hwcfg & 3);
chan->addr_reg = dma_regaddr(chan, S3C2410_DMA_DISRC);
- return 0;
+ break;
+
+ default:
+ printk(KERN_ERR "dma%d: invalid source type (%d)\n",
+ channel, source);
+
+ return -EINVAL;
}
- printk(KERN_ERR "dma%d: invalid source type (%d)\n", channel, source);
- return -EINVAL;
+ if (dma_sel.direction != NULL)
+ (dma_sel.direction)(chan, chan->map, source);
+
+ return 0;
}
EXPORT_SYMBOL(s3c2410_dma_devconfig);
@@ -1227,6 +1237,10 @@ 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 */
@@ -1234,7 +1248,7 @@ 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);
@@ -1256,6 +1270,24 @@ 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;
}
@@ -1445,6 +1477,7 @@ 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 */