From: Dong Aisheng <[email protected]> Signed-off-by: Dong Aisheng <[email protected]>
--- The patch is still using a private way for dma part binding since the common dma binding is still under discussion. http://www.spinics.net/lists/linux-omap/msg65528.html Will update to use common dma binding when it hits mainline. --- .../devicetree/bindings/mmc/fsl-mxs-mmc.txt | 23 ++++++ drivers/mmc/host/mxs-mmc.c | 82 +++++++++++++++++++- 2 files changed, 102 insertions(+), 3 deletions(-) diff --git a/Documentation/devicetree/bindings/mmc/fsl-mxs-mmc.txt b/Documentation/devicetree/bindings/mmc/fsl-mxs-mmc.txt new file mode 100644 index 0000000..adc1142 --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/fsl-mxs-mmc.txt @@ -0,0 +1,23 @@ +* FREESCALE MXS MMC peripheral + +Required properties: +- compatible : Should be "fsl,<chip>-mmc" +- reg : Should contain registers location and length +- interrupts : Should contain interrupt. + The format is <irq_err irq_dma>. +- dma_channel: Should contain the dma channel it uses + +Optional properties: +- wp-gpios : Specify GPIOs for write protection +- slot-4bit: Specify 4 bit mode support +- slot-8bit: Specify 8 bit and 4 bit mode support + +Examples: +mmc1: ssp@80010000 { + compatible = "fsl,imx28-mmc"; + reg = <0x80010000 2000>; + /* <irq_err irq_dma> */ + interrupts = <96 82>; + dma_channel = <0>; + slot-8bit; +}; diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c index 382c835..6cf2d17 100644 --- a/drivers/mmc/host/mxs-mmc.c +++ b/drivers/mmc/host/mxs-mmc.c @@ -38,6 +38,10 @@ #include <linux/gpio.h> #include <linux/regulator/consumer.h> #include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> +#include <linux/slab.h> #include <mach/mxs.h> #include <mach/common.h> @@ -673,17 +677,79 @@ static bool mxs_mmc_dma_filter(struct dma_chan *chan, void *param) return true; } +#ifdef CONFIG_OF +static struct resource * __devinit mxs_mmc_get_of_dmares( + struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct resource *dmares; + int ret; + + if (!np) + return NULL; + + dmares = kzalloc(sizeof(*dmares), GFP_KERNEL); + dmares->flags = IORESOURCE_DMA; + ret = of_property_read_u32(np, "dma_channel", &dmares->start); + if (ret) { + dev_err(&pdev->dev, "unable to get dmares from dt\n"); + return NULL; + } + dmares->end = dmares->start; + + return dmares; +} + +static int __devinit mxs_mmc_get_of_property(struct platform_device *pdev, + struct mxs_mmc_platform_data **ppdata) +{ + struct device_node *np = pdev->dev.of_node; + struct mxs_mmc_platform_data *pdata = *ppdata; + + if (!np) + return -ENODEV; + + pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); + + if (of_get_property(np, "slot-8bit", NULL)) + pdata->flags |= SLOTF_8_BIT_CAPABLE; + + if (of_get_property(np, "slot-4bit", NULL)) + pdata->flags |= SLOTF_4_BIT_CAPABLE; + + pdata->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0); + + dev_dbg(&pdev->dev, "wp-gpios %d flags %d\n", pdata->wp_gpio, + pdata->flags); + + return 0; +} +#else +static struct resource * __devinit mxs_mmc_get_of_dmares( + struct platform_device *pdev) +{ + return NULL; +} +static inline int mxs_mmc_get_of_property(struct platform_device *pdev, + struct mxs_mmc_platform_data *pdata) +{ + return -ENODEV; +} +#endif + static int mxs_mmc_probe(struct platform_device *pdev) { struct mxs_mmc_host *host; struct mmc_host *mmc; struct resource *iores, *dmares, *r; - struct mxs_mmc_platform_data *pdata; + struct mxs_mmc_platform_data *pdata = NULL; int ret = 0, irq_err, irq_dma; dma_cap_mask_t mask; iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); - dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); + dmares = mxs_mmc_get_of_dmares(pdev); + if (dmares == NULL) + dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); irq_err = platform_get_irq(pdev, 0); irq_dma = platform_get_irq(pdev, 1); if (!iores || !dmares || irq_err < 0 || irq_dma < 0) @@ -740,7 +806,9 @@ static int mxs_mmc_probe(struct platform_device *pdev) mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL; - pdata = mmc_dev(host->mmc)->platform_data; + mxs_mmc_get_of_property(pdev, &pdata); + if (pdata == NULL) + pdata = mmc_dev(host->mmc)->platform_data; if (pdata) { if (pdata->flags & SLOTF_8_BIT_CAPABLE) mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA; @@ -851,6 +919,13 @@ static const struct dev_pm_ops mxs_mmc_pm_ops = { }; #endif +static const struct of_device_id mxs_mmc_dt_ids[] = { + { .compatible = "fsl,imx23-mmc", .data = NULL, }, + { .compatible = "fsl,imx28-mmc", .data = NULL, }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mxs_mmc_dt_ids); + static struct platform_driver mxs_mmc_driver = { .probe = mxs_mmc_probe, .remove = mxs_mmc_remove, @@ -860,6 +935,7 @@ static struct platform_driver mxs_mmc_driver = { #ifdef CONFIG_PM .pm = &mxs_mmc_pm_ops, #endif + .of_match_table = mxs_mmc_dt_ids, }, }; -- 1.7.0.4 _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
