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MIPS: lantiq: dma: reset correct number of channel 

Different SoCs have a different number of channels, e.g .:
* amazon-se has 10 channels,
* danube+ar9 have 20 channels,
* vr9 has 28 channels,
* ar10 has 24 channels.

We can read the ID register and, depending on the reported
number of channels, reset the appropriate number of channels.

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Aleksander Jan Bajkowski 2021-09-14 23:20:59 +02:00 committed by David S. Miller
parent c12aa581f6
commit 5ca9ce2ba4
1 changed files with 6 additions and 5 deletions
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11
arch/mips/lantiq/xway/dma.c
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@ -31,6 +31,7 @@
#define LTQ_DMA_PCTRL 0x44
#define LTQ_DMA_IRNEN 0xf4
#define DMA_ID_CHNR GENMASK(26, 20) /* channel number */
#define DMA_DESCPT BIT(3) /* descriptor complete irq */
#define DMA_TX BIT(8) /* TX channel direction */
#define DMA_CHAN_ON BIT(0) /* channel on / off bit */
@ -41,7 +42,6 @@
#define DMA_POLL BIT(31) /* turn on channel polling */
#define DMA_CLK_DIV4 BIT(6) /* polling clock divider */
#define DMA_2W_BURST BIT(1) /* 2 word burst length */
#define DMA_MAX_CHANNEL 20 /* the soc has 20 channels */
#define DMA_ETOP_ENDIANNESS (0xf << 8) /* endianness swap etop channels */
#define DMA_WEIGHT (BIT(17) | BIT(16)) /* default channel wheight */
@ -207,7 +207,7 @@ ltq_dma_init(struct platform_device *pdev)
{
struct clk *clk;
struct resource *res;
unsigned id;
unsigned int id, nchannels;
int i;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@ -229,17 +229,18 @@ ltq_dma_init(struct platform_device *pdev)
ltq_dma_w32(0, LTQ_DMA_IRNEN);
/* reset/configure each channel */
for (i = 0; i < DMA_MAX_CHANNEL; i++) {
id = ltq_dma_r32(LTQ_DMA_ID);
nchannels = ((id & DMA_ID_CHNR) >> 20);
for (i = 0; i < nchannels; i++) {
ltq_dma_w32(i, LTQ_DMA_CS);
ltq_dma_w32(DMA_CHAN_RST, LTQ_DMA_CCTRL);
ltq_dma_w32(DMA_POLL | DMA_CLK_DIV4, LTQ_DMA_CPOLL);
ltq_dma_w32_mask(DMA_CHAN_ON, 0, LTQ_DMA_CCTRL);
}
id = ltq_dma_r32(LTQ_DMA_ID);
dev_info(&pdev->dev,
"Init done - hw rev: %X, ports: %d, channels: %d\n",
id & 0x1f, (id >> 16) & 0xf, id >> 20);
id & 0x1f, (id >> 16) & 0xf, nchannels);
return 0;
}