Commit a02f8f48 authored by Zhou Yanjie's avatar Zhou Yanjie Committed by Ulf Hansson
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mmc: jz4740: Add 8bit mode support 



Add support for 8bit mode, now supports 1bit/4bit/8bit modes.

Signed-off-by: default avatarZhou Yanjie <zhouyanjie@zoho.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 38413ce3

drivers/mmc/host/jz4740_mmc.c

+10 −2
Original line number Diff line number Diff line
@@ -77,6 +77,8 @@ 


#define JZ_MMC_CMDAT_IO_ABORT BIT(11)

#define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)

#define JZ_MMC_CMDAT_BUS_WIDTH_8BIT (BIT(10) | BIT(9))

#define	JZ_MMC_CMDAT_BUS_WIDTH_MASK (BIT(10) | BIT(9))

#define JZ_MMC_CMDAT_DMA_EN BIT(8)

#define JZ_MMC_CMDAT_INIT BIT(7)

#define JZ_MMC_CMDAT_BUSY BIT(6)
@@ -895,11 +897,16 @@ static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 


	switch (ios->bus_width) {

	case MMC_BUS_WIDTH_1:

		host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_4BIT;

		host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;

		break;

	case MMC_BUS_WIDTH_4:

		host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;

		host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;

		break;

	case MMC_BUS_WIDTH_8:

		host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;

		host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_8BIT;

		break;

	default:

		break;

	}
@@ -1029,7 +1036,8 @@ static int jz4740_mmc_probe(struct platform_device* pdev) 


	dev_info(&pdev->dev, "Using %s, %d-bit mode\n",

		 host->use_dma ? "DMA" : "PIO",

		 (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);

		 (mmc->caps & MMC_CAP_8_BIT_DATA) ? 8 :

		 ((mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1));



	return 0;