diff options
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/imx-sdma.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 34dece3af192..acf1e2f0c23c 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -42,6 +42,9 @@ #include <asm/irq.h> #include <linux/platform_data/dma-imx-sdma.h> #include <linux/platform_data/dma-imx.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> +#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> #include "dmaengine.h" @@ -1447,6 +1450,72 @@ err_firmware: release_firmware(fw); } +#define EVENT_REMAP_CELLS 3 + +static int __init sdma_event_remap(struct sdma_engine *sdma) +{ + struct device_node *np = sdma->dev->of_node; + struct device_node *gpr_np = of_parse_phandle(np, "gpr", 0); + struct property *event_remap; + struct regmap *gpr; + char propname[] = "fsl,sdma-event-remap"; + u32 reg, val, shift, num_map, i; + int ret = 0; + + if (IS_ERR(np) || IS_ERR(gpr_np)) + goto out; + + event_remap = of_find_property(np, propname, NULL); + num_map = event_remap ? (event_remap->length / sizeof(u32)) : 0; + if (!num_map) { + dev_warn(sdma->dev, "no event needs to be remapped\n"); + goto out; + } else if (num_map % EVENT_REMAP_CELLS) { + dev_err(sdma->dev, "the property %s must modulo %d\n", + propname, EVENT_REMAP_CELLS); + ret = -EINVAL; + goto out; + } + + gpr = syscon_node_to_regmap(gpr_np); + if (IS_ERR(gpr)) { + dev_err(sdma->dev, "failed to get gpr regmap\n"); + ret = PTR_ERR(gpr); + goto out; + } + + for (i = 0; i < num_map; i += EVENT_REMAP_CELLS) { + ret = of_property_read_u32_index(np, propname, i, ®); + if (ret) { + dev_err(sdma->dev, "failed to read property %s index %d\n", + propname, i); + goto out; + } + + ret = of_property_read_u32_index(np, propname, i + 1, &shift); + if (ret) { + dev_err(sdma->dev, "failed to read property %s index %d\n", + propname, i + 1); + goto out; + } + + ret = of_property_read_u32_index(np, propname, i + 2, &val); + if (ret) { + dev_err(sdma->dev, "failed to read property %s index %d\n", + propname, i + 2); + goto out; + } + + regmap_update_bits(gpr, reg, BIT(shift), val << shift); + } + +out: + if (!IS_ERR(gpr_np)) + of_node_put(gpr_np); + + return ret; +} + static int sdma_get_firmware(struct sdma_engine *sdma, const char *fw_name) { @@ -1671,6 +1740,10 @@ static int sdma_probe(struct platform_device *pdev) if (ret) goto err_init; + ret = sdma_event_remap(sdma); + if (ret) + goto err_init; + if (sdma->drvdata->script_addrs) sdma_add_scripts(sdma, sdma->drvdata->script_addrs); if (pdata && pdata->script_addrs) |