diff options
| -rw-r--r-- | Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt | 15 | ||||
| -rw-r--r-- | drivers/dma/ti-dma-crossbar.c | 251 |
2 files changed, 234 insertions, 32 deletions
diff --git a/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt b/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt index 63a48928f3a8..b152a75dceae 100644 --- a/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt +++ b/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt @@ -2,9 +2,10 @@ Texas Instruments DMA Crossbar (DMA request router) Required properties: - compatible: "ti,dra7-dma-crossbar" for DRA7xx DMA crossbar + "ti,am335x-edma-crossbar" for AM335x and AM437x - reg: Memory map for accessing module -- #dma-cells: Should be set to <1>. - Clients should use the crossbar request number (input) +- #dma-cells: Should be set to to match with the DMA controller's dma-cells + for ti,dra7-dma-crossbar and <3> for ti,am335x-edma-crossbar. - dma-requests: Number of DMA requests the crossbar can receive - dma-masters: phandle pointing to the DMA controller @@ -14,6 +15,15 @@ The DMA controller node need to have the following poroperties: Optional properties: - ti,dma-safe-map: Safe routing value for unused request lines +Notes: +When requesting channel via ti,dra7-dma-crossbar, the DMA clinet must request +the DMA event number as crossbar ID (input to the DMA crossbar). + +For ti,am335x-edma-crossbar: the meaning of parameters of dmas for clients: +dmas = <&edma_xbar 12 0 1>; where <12> is the DMA request number, <0> is the TC +the event should be assigned and <1> is the mux selection for in the crossbar. +When mux 0 is used the DMA channel can be requested directly from edma node. + Example: /* DMA controller */ @@ -47,6 +57,7 @@ uart1: serial@4806a000 { ti,hwmods = "uart1"; clock-frequency = <48000000>; status = "disabled"; + /* Requesting crossbar input 49 and 50 */ dmas = <&sdma_xbar 49>, <&sdma_xbar 50>; dma-names = "tx", "rx"; }; 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 = { |