AuxXxilium/linux_dsm_epyc7002
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Merge branch 'topic/ti-xbar' into for-linus

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This commit is contained in:
Vinod Koul 2015-08-23 18:54:31 +05:30
commit 76891cc8c4
1 changed files with 31 additions and 10 deletions
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41
drivers/dma/ti-dma-crossbar.c
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@ -20,16 +20,19 @@
#define TI_XBAR_OUTPUTS 127
#define TI_XBAR_INPUTS 256
static DEFINE_IDR(map_idr);
#define TI_XBAR_EDMA_OFFSET 0
#define TI_XBAR_SDMA_OFFSET 1
struct ti_dma_xbar_data {
void __iomem *iomem;
struct dma_router dmarouter;
struct idr map_idr;
u16 safe_val; /* Value to rest the crossbar lines */
u32 xbar_requests; /* number of DMA requests connected to XBAR */
u32 dma_requests; /* number of DMA requests forwarded to DMA */
u32 dma_offset;
};
struct ti_dma_xbar_map {
@ -51,7 +54,7 @@ static void ti_dma_xbar_free(struct device *dev, void *route_data)
map->xbar_in, map->xbar_out);
ti_dma_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val);
idr_remove(&map_idr, map->xbar_out);
idr_remove(&xbar->map_idr, map->xbar_out);
kfree(map);
}
@ -81,12 +84,11 @@ static void *ti_dma_xbar_route_allocate(struct of_phandle_args *dma_spec,
return ERR_PTR(-ENOMEM);
}
map->xbar_out = idr_alloc(&map_idr, NULL, 0, xbar->dma_requests,
map->xbar_out = idr_alloc(&xbar->map_idr, NULL, 0, xbar->dma_requests,
GFP_KERNEL);
map->xbar_in = (u16)dma_spec->args[0];
/* The DMA request is 1 based in sDMA */
dma_spec->args[0] = map->xbar_out + 1;
dma_spec->args[0] = map->xbar_out + xbar->dma_offset;
dev_dbg(&pdev->dev, "Mapping XBAR%u to DMA%d\n",
map->xbar_in, map->xbar_out);
@ -96,9 +98,22 @@ static void *ti_dma_xbar_route_allocate(struct of_phandle_args *dma_spec,
return map;
}
static const struct of_device_id ti_dma_master_match[] = {
{
.compatible = "ti,omap4430-sdma",
.data = (void *)TI_XBAR_SDMA_OFFSET,
},
{
.compatible = "ti,edma3",
.data = (void *)TI_XBAR_EDMA_OFFSET,
},
{},
};
static int ti_dma_xbar_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
const struct of_device_id *match;
struct device_node *dma_node;
struct ti_dma_xbar_data *xbar;
struct resource *res;
@ -113,12 +128,20 @@ static int ti_dma_xbar_probe(struct platform_device *pdev)
if (!xbar)
return -ENOMEM;
idr_init(&xbar->map_idr);
dma_node = of_parse_phandle(node, "dma-masters", 0);
if (!dma_node) {
dev_err(&pdev->dev, "Can't get DMA master node\n");
return -ENODEV;
}
match = of_match_node(ti_dma_master_match, dma_node);
if (!match) {
dev_err(&pdev->dev, "DMA master is not supported\n");
return -EINVAL;
}
if (of_property_read_u32(dma_node, "dma-requests",
&xbar->dma_requests)) {
dev_info(&pdev->dev,
@ -139,17 +162,15 @@ static int ti_dma_xbar_probe(struct platform_device *pdev)
xbar->safe_val = (u16)safe_val;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
iomem = devm_ioremap_resource(&pdev->dev, res);
if (!iomem)
return -ENOMEM;
if (IS_ERR(iomem))
return PTR_ERR(iomem);
xbar->iomem = iomem;
xbar->dmarouter.dev = &pdev->dev;
xbar->dmarouter.route_free = ti_dma_xbar_free;
xbar->dma_offset = (u32)match->data;
platform_set_drvdata(pdev, xbar);