diff options
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/davinci_mmc.txt | 33 | ||||
| -rw-r--r-- | drivers/mmc/host/davinci_mmc.c | 70 |
2 files changed, 99 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/mmc/davinci_mmc.txt b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt new file mode 100644 index 000000000000..e5a0140b2381 --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt @@ -0,0 +1,33 @@ +* TI Highspeed MMC host controller for DaVinci + +The Highspeed MMC Host Controller on TI DaVinci family +provides an interface for MMC, SD and SDIO types of memory cards. + +This file documents the properties used by the davinci_mmc driver. + +Required properties: +- compatible: + Should be "ti,da830-mmc": for da830, da850, dm365 + Should be "ti,dm355-mmc": for dm355, dm644x + +Optional properties: +- bus-width: Number of data lines, can be <1>, <4>, or <8>, default <1> +- max-frequency: Maximum operating clock frequency, default 25MHz. +- dmas: List of DMA specifiers with the controller specific format + as described in the generic DMA client binding. A tx and rx + specifier is required. +- dma-names: RX and TX DMA request names. These strings correspond + 1:1 with the DMA specifiers listed in dmas. + +Example: +mmc0: mmc@1c40000 { + compatible = "ti,da830-mmc", + reg = <0x40000 0x1000>; + interrupts = <16>; + status = "okay"; + bus-width = <4>; + max-frequency = <50000000>; + dmas = <&edma 16 + &edma 17>; + dma-names = "rx", "tx"; +}; diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c index b5f1c019ecad..f8a96d652e9e 100644 --- a/drivers/mmc/host/davinci_mmc.c +++ b/drivers/mmc/host/davinci_mmc.c @@ -34,6 +34,8 @@ #include <linux/dma-mapping.h> #include <linux/edma.h> #include <linux/mmc/mmc.h> +#include <linux/of.h> +#include <linux/of_device.h> #include <linux/platform_data/mmc-davinci.h> @@ -522,14 +524,16 @@ static int __init davinci_acquire_dma_channels(struct mmc_davinci_host *host) dma_cap_set(DMA_SLAVE, mask); host->dma_tx = - dma_request_channel(mask, edma_filter_fn, &host->txdma); + dma_request_slave_channel_compat(mask, edma_filter_fn, + &host->txdma, mmc_dev(host->mmc), "tx"); if (!host->dma_tx) { dev_err(mmc_dev(host->mmc), "Can't get dma_tx channel\n"); return -ENODEV; } host->dma_rx = - dma_request_channel(mask, edma_filter_fn, &host->rxdma); + dma_request_slave_channel_compat(mask, edma_filter_fn, + &host->rxdma, mmc_dev(host->mmc), "rx"); if (!host->dma_rx) { dev_err(mmc_dev(host->mmc), "Can't get dma_rx channel\n"); r = -ENODEV; @@ -1169,9 +1173,62 @@ static struct platform_device_id davinci_mmc_devtype[] = { }; MODULE_DEVICE_TABLE(platform, davinci_mmc_devtype); -static int __init davinci_mmcsd_probe(struct platform_device *pdev) +static const struct of_device_id davinci_mmc_dt_ids[] = { + { + .compatible = "ti,dm6441-mmc", + .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_1], + }, + { + .compatible = "ti,da830-mmc", + .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_2], + }, + {}, +}; +MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids); + +static struct davinci_mmc_config + *mmc_parse_pdata(struct platform_device *pdev) { + struct device_node *np; struct davinci_mmc_config *pdata = pdev->dev.platform_data; + const struct of_device_id *match = + of_match_device(of_match_ptr(davinci_mmc_dt_ids), &pdev->dev); + u32 data; + + np = pdev->dev.of_node; + if (!np) + return pdata; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) { + dev_err(&pdev->dev, "Failed to allocate memory for struct davinci_mmc_config\n"); + goto nodata; + } + + if (match) + pdev->id_entry = match->data; + + if (of_property_read_u32(np, "max-frequency", &pdata->max_freq)) + dev_info(&pdev->dev, "'max-frequency' property not specified, defaulting to 25MHz\n"); + + of_property_read_u32(np, "bus-width", &data); + switch (data) { + case 1: + case 4: + case 8: + pdata->wires = data; + break; + default: + pdata->wires = 1; + dev_info(&pdev->dev, "Unsupported buswidth, defaulting to 1 bit\n"); + } +nodata: + return pdata; +} + +static int __init davinci_mmcsd_probe(struct platform_device *pdev) +{ + struct davinci_mmc_config *pdata = NULL; struct mmc_davinci_host *host = NULL; struct mmc_host *mmc = NULL; struct resource *r, *mem = NULL; @@ -1179,7 +1236,11 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev) size_t mem_size; const struct platform_device_id *id_entry; - /* REVISIT: when we're fully converted, fail if pdata is NULL */ + pdata = mmc_parse_pdata(pdev); + if (pdata == NULL) { + dev_err(&pdev->dev, "Couldn't get platform data\n"); + return -ENOENT; + } ret = -ENODEV; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -1421,6 +1482,7 @@ static struct platform_driver davinci_mmcsd_driver = { .name = "davinci_mmc", .owner = THIS_MODULE, .pm = davinci_mmcsd_pm_ops, + .of_match_table = of_match_ptr(davinci_mmc_dt_ids), }, .remove = __exit_p(davinci_mmcsd_remove), .id_table = davinci_mmc_devtype, |