diff options
Diffstat (limited to 'drivers/dma/ti-dma-crossbar.c')
| -rw-r--r-- | drivers/dma/ti-dma-crossbar.c | 81 |
1 files changed, 70 insertions, 11 deletions
diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c index a415edbe61b1..e107779b1a2e 100644 --- a/drivers/dma/ti-dma-crossbar.c +++ b/drivers/dma/ti-dma-crossbar.c @@ -12,7 +12,6 @@ #include <linux/init.h> #include <linux/list.h> #include <linux/io.h> -#include <linux/idr.h> #include <linux/of_address.h> #include <linux/of_device.h> #include <linux/of_dma.h> @@ -198,7 +197,8 @@ struct ti_dra7_xbar_data { void __iomem *iomem; struct dma_router dmarouter; - struct idr map_idr; + struct mutex mutex; + unsigned long *dma_inuse; u16 safe_val; /* Value to rest the crossbar lines */ u32 xbar_requests; /* number of DMA requests connected to XBAR */ @@ -225,7 +225,9 @@ static void ti_dra7_xbar_free(struct device *dev, void *route_data) map->xbar_in, map->xbar_out); ti_dra7_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val); - idr_remove(&xbar->map_idr, map->xbar_out); + mutex_lock(&xbar->mutex); + clear_bit(map->xbar_out, xbar->dma_inuse); + mutex_unlock(&xbar->mutex); kfree(map); } @@ -255,8 +257,17 @@ static void *ti_dra7_xbar_route_allocate(struct of_phandle_args *dma_spec, return ERR_PTR(-ENOMEM); } - map->xbar_out = idr_alloc(&xbar->map_idr, NULL, 0, xbar->dma_requests, - GFP_KERNEL); + mutex_lock(&xbar->mutex); + map->xbar_out = find_first_zero_bit(xbar->dma_inuse, + xbar->dma_requests); + mutex_unlock(&xbar->mutex); + if (map->xbar_out == xbar->dma_requests) { + dev_err(&pdev->dev, "Run out of free DMA requests\n"); + kfree(map); + return ERR_PTR(-ENOMEM); + } + set_bit(map->xbar_out, xbar->dma_inuse); + map->xbar_in = (u16)dma_spec->args[0]; dma_spec->args[0] = map->xbar_out + xbar->dma_offset; @@ -278,17 +289,29 @@ static const struct of_device_id ti_dra7_master_match[] = { .compatible = "ti,edma3", .data = (void *)TI_XBAR_EDMA_OFFSET, }, + { + .compatible = "ti,edma3-tpcc", + .data = (void *)TI_XBAR_EDMA_OFFSET, + }, {}, }; +static inline void ti_dra7_xbar_reserve(int offset, int len, unsigned long *p) +{ + for (; len > 0; len--) + clear_bit(offset + (len - 1), p); +} + 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_dra7_xbar_data *xbar; + struct property *prop; struct resource *res; u32 safe_val; + size_t sz; void __iomem *iomem; int i, ret; @@ -299,8 +322,6 @@ static int ti_dra7_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"); @@ -322,6 +343,12 @@ static int ti_dra7_xbar_probe(struct platform_device *pdev) } of_node_put(dma_node); + xbar->dma_inuse = devm_kcalloc(&pdev->dev, + BITS_TO_LONGS(xbar->dma_requests), + sizeof(unsigned long), GFP_KERNEL); + if (!xbar->dma_inuse) + return -ENOMEM; + if (of_property_read_u32(node, "dma-requests", &xbar->xbar_requests)) { dev_info(&pdev->dev, "Missing XBAR input information, using %u.\n", @@ -332,6 +359,33 @@ static int ti_dra7_xbar_probe(struct platform_device *pdev) if (!of_property_read_u32(node, "ti,dma-safe-map", &safe_val)) xbar->safe_val = (u16)safe_val; + + prop = of_find_property(node, "ti,reserved-dma-request-ranges", &sz); + if (prop) { + const char pname[] = "ti,reserved-dma-request-ranges"; + u32 (*rsv_events)[2]; + size_t nelm = sz / sizeof(*rsv_events); + int i; + + if (!nelm) + return -EINVAL; + + rsv_events = kcalloc(nelm, sizeof(*rsv_events), GFP_KERNEL); + if (!rsv_events) + return -ENOMEM; + + ret = of_property_read_u32_array(node, pname, (u32 *)rsv_events, + nelm * 2); + if (ret) + return ret; + + for (i = 0; i < nelm; i++) { + ti_dra7_xbar_reserve(rsv_events[i][0], rsv_events[i][1], + xbar->dma_inuse); + } + kfree(rsv_events); + } + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); iomem = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(iomem)) @@ -343,18 +397,23 @@ static int ti_dra7_xbar_probe(struct platform_device *pdev) xbar->dmarouter.route_free = ti_dra7_xbar_free; xbar->dma_offset = (u32)match->data; + mutex_init(&xbar->mutex); platform_set_drvdata(pdev, xbar); /* Reset the crossbar */ - for (i = 0; i < xbar->dma_requests; i++) - ti_dra7_xbar_write(xbar->iomem, i, xbar->safe_val); + for (i = 0; i < xbar->dma_requests; i++) { + if (!test_bit(i, xbar->dma_inuse)) + ti_dra7_xbar_write(xbar->iomem, i, xbar->safe_val); + } 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_dra7_xbar_write(xbar->iomem, i, i); + for (i = 0; i < xbar->dma_requests; i++) { + if (!test_bit(i, xbar->dma_inuse)) + ti_dra7_xbar_write(xbar->iomem, i, i); + } } return ret; |