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mmc: jz4740: Add 8bit mode support 

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

Signed-off-by: Zhou Yanjie <zhouyanjie@zoho.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Zhou Yanjie 2019-10-12 13:13:15 +08:00 committed by Ulf Hansson
parent 38413ce39a
commit a02f8f48c1
1 changed files with 10 additions and 2 deletions
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12
drivers/mmc/host/jz4740_mmc.c
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@ -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;