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dmaengine: pl330: Add support for dmamux parsed from DT

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dmamux pair0: args[1]: reg0 args[2]: val0
dmamux pair1: args[3]: reg1 args[4]: val1

e.g. rk3506

sai0 {
    dmas = <&dmac0 9 0xff2880a4 0x01000100 0xff2880ac 0x000c0000>,
           <&dmac0 8 0xff2880a4 0x00800080 0xff2880ac 0x00030002>;
}

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Change-Id: I81a2d5e8de37954930b6d0e0aab061273ae76cd2
This commit is contained in:
Sugar Zhang
2024-07-22 19:49:58 +08:00
committed by Tao Huang
parent 1087df59e2
commit 0cabdbb81c
1 changed files with 32 additions and 2 deletions
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34
drivers/dma/pl330.c
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@@ -2331,19 +2331,49 @@ static struct dma_chan *of_dma_pl330_xlate(struct of_phandle_args *dma_spec,
{ {
int count = dma_spec->args_count; int count = dma_spec->args_count;
struct pl330_dmac *pl330 = ofdma->of_dma_data; struct pl330_dmac *pl330 = ofdma->of_dma_data;
struct dma_chan *chan;
unsigned int chan_id; unsigned int chan_id;
if (!pl330) if (!pl330)
return NULL; return NULL;
if (count != 1) if (count < 1)
return NULL; return NULL;
chan_id = dma_spec->args[0]; chan_id = dma_spec->args[0];
if (chan_id >= pl330->num_peripherals) if (chan_id >= pl330->num_peripherals)
return NULL; return NULL;
return dma_get_slave_channel(&pl330->peripherals[chan_id].chan); chan = dma_get_slave_channel(&pl330->peripherals[chan_id].chan);
/* Support dmamux set, such as rk3506 */
if (chan && count == 5) {
void __iomem *r;
/* dmamux pair0: args[1]: reg0 args[2]: val0 */
if (dma_spec->args[1]) {
r = ioremap(dma_spec->args[1], 0x4);
if (r) {
writel(dma_spec->args[2], r);
iounmap(r);
}
}
/* dmamux pair1: args[3]: reg1 args[4]: val1 */
if (dma_spec->args[3]) {
r = ioremap(dma_spec->args[3], 0x4);
if (r) {
writel(dma_spec->args[4], r);
iounmap(r);
}
}
dev_dbg(pl330->ddma.dev, "r0: 0x%08x v0: 0x%08x r1: 0x%08x, v1: 0x%08x\n",
dma_spec->args[1], dma_spec->args[2],
dma_spec->args[3], dma_spec->args[4]);
}
return chan;
} }
static int pl330_alloc_chan_resources(struct dma_chan *chan) static int pl330_alloc_chan_resources(struct dma_chan *chan)