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-rw-r--r--drivers/dma/ti-dma-crossbar.c251
1 files changed, 221 insertions, 30 deletions
diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c
index 5cce8c9d0026..a415edbe61b1 100644
--- a/drivers/dma/ti-dma-crossbar.c
+++ b/drivers/dma/ti-dma-crossbar.c
@@ -17,13 +17,184 @@
#include <linux/of_device.h>
#include <linux/of_dma.h>
-#define TI_XBAR_OUTPUTS 127
-#define TI_XBAR_INPUTS 256
+#define TI_XBAR_DRA7 0
+#define TI_XBAR_AM335X 1
+
+static const struct of_device_id ti_dma_xbar_match[] = {
+ {
+ .compatible = "ti,dra7-dma-crossbar",
+ .data = (void *)TI_XBAR_DRA7,
+ },
+ {
+ .compatible = "ti,am335x-edma-crossbar",
+ .data = (void *)TI_XBAR_AM335X,
+ },
+ {},
+};
+
+/* Crossbar on AM335x/AM437x family */
+#define TI_AM335X_XBAR_LINES 64
+
+struct ti_am335x_xbar_data {
+ void __iomem *iomem;
+
+ struct dma_router dmarouter;
+
+ u32 xbar_events; /* maximum number of events to select in xbar */
+ u32 dma_requests; /* number of DMA requests on eDMA */
+};
+
+struct ti_am335x_xbar_map {
+ u16 dma_line;
+ u16 mux_val;
+};
+
+static inline void ti_am335x_xbar_write(void __iomem *iomem, int event, u16 val)
+{
+ writeb_relaxed(val & 0x1f, iomem + event);
+}
+
+static void ti_am335x_xbar_free(struct device *dev, void *route_data)
+{
+ struct ti_am335x_xbar_data *xbar = dev_get_drvdata(dev);
+ struct ti_am335x_xbar_map *map = route_data;
+
+ dev_dbg(dev, "Unmapping XBAR event %u on channel %u\n",
+ map->mux_val, map->dma_line);
+
+ ti_am335x_xbar_write(xbar->iomem, map->dma_line, 0);
+ kfree(map);
+}
+
+static void *ti_am335x_xbar_route_allocate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
+ struct ti_am335x_xbar_data *xbar = platform_get_drvdata(pdev);
+ struct ti_am335x_xbar_map *map;
+
+ if (dma_spec->args_count != 3)
+ return ERR_PTR(-EINVAL);
+
+ if (dma_spec->args[2] >= xbar->xbar_events) {
+ dev_err(&pdev->dev, "Invalid XBAR event number: %d\n",
+ dma_spec->args[2]);
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (dma_spec->args[0] >= xbar->dma_requests) {
+ dev_err(&pdev->dev, "Invalid DMA request line number: %d\n",
+ dma_spec->args[0]);
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* The of_node_put() will be done in the core for the node */
+ dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
+ if (!dma_spec->np) {
+ dev_err(&pdev->dev, "Can't get DMA master\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ map = kzalloc(sizeof(*map), GFP_KERNEL);
+ if (!map) {
+ of_node_put(dma_spec->np);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ map->dma_line = (u16)dma_spec->args[0];
+ map->mux_val = (u16)dma_spec->args[2];
+
+ dma_spec->args[2] = 0;
+ dma_spec->args_count = 2;
+
+ dev_dbg(&pdev->dev, "Mapping XBAR event%u to DMA%u\n",
+ map->mux_val, map->dma_line);
+
+ ti_am335x_xbar_write(xbar->iomem, map->dma_line, map->mux_val);
+
+ return map;
+}
+
+static const struct of_device_id ti_am335x_master_match[] = {
+ { .compatible = "ti,edma3-tpcc", },
+ {},
+};
+
+static int ti_am335x_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_am335x_xbar_data *xbar;
+ struct resource *res;
+ void __iomem *iomem;
+ int i, ret;
+
+ if (!node)
+ return -ENODEV;
+
+ xbar = devm_kzalloc(&pdev->dev, sizeof(*xbar), GFP_KERNEL);
+ if (!xbar)
+ return -ENOMEM;
+
+ 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_am335x_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,
+ "Missing XBAR output information, using %u.\n",
+ TI_AM335X_XBAR_LINES);
+ xbar->dma_requests = TI_AM335X_XBAR_LINES;
+ }
+ of_node_put(dma_node);
+
+ if (of_property_read_u32(node, "dma-requests", &xbar->xbar_events)) {
+ dev_info(&pdev->dev,
+ "Missing XBAR input information, using %u.\n",
+ TI_AM335X_XBAR_LINES);
+ xbar->xbar_events = TI_AM335X_XBAR_LINES;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ iomem = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(iomem))
+ return PTR_ERR(iomem);
+
+ xbar->iomem = iomem;
+
+ xbar->dmarouter.dev = &pdev->dev;
+ xbar->dmarouter.route_free = ti_am335x_xbar_free;
+
+ platform_set_drvdata(pdev, xbar);
+
+ /* Reset the crossbar */
+ for (i = 0; i < xbar->dma_requests; i++)
+ ti_am335x_xbar_write(xbar->iomem, i, 0);
+
+ ret = of_dma_router_register(node, ti_am335x_xbar_route_allocate,
+ &xbar->dmarouter);
+
+ return ret;
+}
+
+/* Crossbar on DRA7xx family */
+#define TI_DRA7_XBAR_OUTPUTS 127
+#define TI_DRA7_XBAR_INPUTS 256
#define TI_XBAR_EDMA_OFFSET 0
#define TI_XBAR_SDMA_OFFSET 1
-struct ti_dma_xbar_data {
+struct ti_dra7_xbar_data {
void __iomem *iomem;
struct dma_router dmarouter;
@@ -35,35 +206,35 @@ struct ti_dma_xbar_data {
u32 dma_offset;
};
-struct ti_dma_xbar_map {
+struct ti_dra7_xbar_map {
u16 xbar_in;
int xbar_out;
};
-static inline void ti_dma_xbar_write(void __iomem *iomem, int xbar, u16 val)
+static inline void ti_dra7_xbar_write(void __iomem *iomem, int xbar, u16 val)
{
writew_relaxed(val, iomem + (xbar * 2));
}
-static void ti_dma_xbar_free(struct device *dev, void *route_data)
+static void ti_dra7_xbar_free(struct device *dev, void *route_data)
{
- struct ti_dma_xbar_data *xbar = dev_get_drvdata(dev);
- struct ti_dma_xbar_map *map = route_data;
+ struct ti_dra7_xbar_data *xbar = dev_get_drvdata(dev);
+ struct ti_dra7_xbar_map *map = route_data;
dev_dbg(dev, "Unmapping XBAR%u (was routed to %d)\n",
map->xbar_in, map->xbar_out);
- ti_dma_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val);
+ ti_dra7_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val);
idr_remove(&xbar->map_idr, map->xbar_out);
kfree(map);
}
-static void *ti_dma_xbar_route_allocate(struct of_phandle_args *dma_spec,
- struct of_dma *ofdma)
+static void *ti_dra7_xbar_route_allocate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
{
struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
- struct ti_dma_xbar_data *xbar = platform_get_drvdata(pdev);
- struct ti_dma_xbar_map *map;
+ struct ti_dra7_xbar_data *xbar = platform_get_drvdata(pdev);
+ struct ti_dra7_xbar_map *map;
if (dma_spec->args[0] >= xbar->xbar_requests) {
dev_err(&pdev->dev, "Invalid XBAR request number: %d\n",
@@ -93,12 +264,12 @@ static void *ti_dma_xbar_route_allocate(struct of_phandle_args *dma_spec,
dev_dbg(&pdev->dev, "Mapping XBAR%u to DMA%d\n",
map->xbar_in, map->xbar_out);
- ti_dma_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in);
+ ti_dra7_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in);
return map;
}
-static const struct of_device_id ti_dma_master_match[] = {
+static const struct of_device_id ti_dra7_master_match[] = {
{
.compatible = "ti,omap4430-sdma",
.data = (void *)TI_XBAR_SDMA_OFFSET,
@@ -110,12 +281,12 @@ static const struct of_device_id ti_dma_master_match[] = {
{},
};
-static int ti_dma_xbar_probe(struct platform_device *pdev)
+static int ti_dra7_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 ti_dra7_xbar_data *xbar;
struct resource *res;
u32 safe_val;
void __iomem *iomem;
@@ -136,7 +307,7 @@ static int ti_dma_xbar_probe(struct platform_device *pdev)
return -ENODEV;
}
- match = of_match_node(ti_dma_master_match, dma_node);
+ match = of_match_node(ti_dra7_master_match, dma_node);
if (!match) {
dev_err(&pdev->dev, "DMA master is not supported\n");
return -EINVAL;
@@ -146,16 +317,16 @@ static int ti_dma_xbar_probe(struct platform_device *pdev)
&xbar->dma_requests)) {
dev_info(&pdev->dev,
"Missing XBAR output information, using %u.\n",
- TI_XBAR_OUTPUTS);
- xbar->dma_requests = TI_XBAR_OUTPUTS;
+ TI_DRA7_XBAR_OUTPUTS);
+ xbar->dma_requests = TI_DRA7_XBAR_OUTPUTS;
}
of_node_put(dma_node);
if (of_property_read_u32(node, "dma-requests", &xbar->xbar_requests)) {
dev_info(&pdev->dev,
"Missing XBAR input information, using %u.\n",
- TI_XBAR_INPUTS);
- xbar->xbar_requests = TI_XBAR_INPUTS;
+ TI_DRA7_XBAR_INPUTS);
+ xbar->xbar_requests = TI_DRA7_XBAR_INPUTS;
}
if (!of_property_read_u32(node, "ti,dma-safe-map", &safe_val))
@@ -169,30 +340,50 @@ static int ti_dma_xbar_probe(struct platform_device *pdev)
xbar->iomem = iomem;
xbar->dmarouter.dev = &pdev->dev;
- xbar->dmarouter.route_free = ti_dma_xbar_free;
+ xbar->dmarouter.route_free = ti_dra7_xbar_free;
xbar->dma_offset = (u32)match->data;
platform_set_drvdata(pdev, xbar);
/* Reset the crossbar */
for (i = 0; i < xbar->dma_requests; i++)
- ti_dma_xbar_write(xbar->iomem, i, xbar->safe_val);
+ ti_dra7_xbar_write(xbar->iomem, i, xbar->safe_val);
- ret = of_dma_router_register(node, ti_dma_xbar_route_allocate,
+ ret = of_dma_router_register(node, ti_dra7_xbar_route_allocate,
&xbar->dmarouter);
if (ret) {
/* Restore the defaults for the crossbar */
for (i = 0; i < xbar->dma_requests; i++)
- ti_dma_xbar_write(xbar->iomem, i, i);
+ ti_dra7_xbar_write(xbar->iomem, i, i);
}
return ret;
}
-static const struct of_device_id ti_dma_xbar_match[] = {
- { .compatible = "ti,dra7-dma-crossbar" },
- {},
-};
+static int ti_dma_xbar_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ int ret;
+
+ match = of_match_node(ti_dma_xbar_match, pdev->dev.of_node);
+ if (unlikely(!match))
+ return -EINVAL;
+
+ switch ((u32)match->data) {
+ case TI_XBAR_DRA7:
+ ret = ti_dra7_xbar_probe(pdev);
+ break;
+ case TI_XBAR_AM335X:
+ ret = ti_am335x_xbar_probe(pdev);
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported crossbar\n");
+ ret = -ENODEV;
+ break;
+ }
+
+ return ret;
+}
static struct platform_driver ti_dma_xbar_driver = {
.driver = {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-11 08:34:41 +0000