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Date: Wed, 9 Jan 2008 12:23:01 +0800
From: "Bryan Wu" <cooloney.lkml@...il.com>
To: "Mike Frysinger" <vapier.adi@...il.com>
Cc: drzeus-mmc@...eus.cx, linux-kernel@...r.kernel.org,
Cliff.Cai@...log.com
Subject: Re: [patch] split MMC_CAP_4_BIT_DATA
On Jan 9, 2008 2:29 AM, Mike Frysinger <vapier.adi@...il.com> wrote:
> The on-chip Blackfin MMC/SD/SDIO host controller has the ability to do 1-bit
> MMC, 1-bit/4-bit SD, and 1-bit/4-bit SDIO. Thus the current convention of
> MMC_CAP_4_BIT_DATA meaning "your host controller can do 1-bit or 4-bit for all
> modes" is insufficient for our needs. The attached patch splits
> MMC_CAP_4_BIT_DATA into MMC_CAP_MMC_4_BIT_DATA and MMC_CAP_SD_4_BIT_DATA and
> updates all host controllers to include these in their caps and then changes
> existing code to check the new defines. At the moment, SD/SDIO are lumped
> into MMC_CAP_SD_4_BIT_DATA ... should I bother with splitting that into SD and
> SDIO as well while I'm doing this ?
>
> Signed-off-by: Mike Frysinger <vapier@...too.org>
> ---
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 68c0e3b..ca12db7 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -397,7 +397,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> * Activate wide bus (if supported).
> */
> if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
> - (host->caps & MMC_CAP_4_BIT_DATA)) {
> + (host->caps & MMC_CAP_MMC_4_BIT_DATA)) {
> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
> if (err)
> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
> index d1c1e0f..974b63d 100644
> --- a/drivers/mmc/core/sd.c
> +++ b/drivers/mmc/core/sd.c
> @@ -441,7 +441,7 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
> /*
> * Switch to wider bus (if supported).
> */
> - if ((host->caps & MMC_CAP_4_BIT_DATA) &&
> + if ((host->caps & MMC_CAP_SD_4_BIT_DATA) &&
> (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
> err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
> if (err)
> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> index 87a50f4..1d389c8 100644
> --- a/drivers/mmc/core/sdio.c
> +++ b/drivers/mmc/core/sdio.c
> @@ -143,7 +143,7 @@ static int sdio_enable_wide(struct mmc_card *card)
> int ret;
> u8 ctrl;
>
> - if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
> + if (!(card->host->caps & MMC_CAP_SD_4_BIT_DATA))
> return 0;
>
> if (card->cccr.low_speed && !card->cccr.wide_bus)
> diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
> index b1edcef..63d89b0 100644
> --- a/drivers/mmc/host/at91_mci.c
> +++ b/drivers/mmc/host/at91_mci.c
> @@ -851,7 +851,7 @@ static int __init at91_mci_probe(struct platform_device *pdev)
> host->board = pdev->dev.platform_data;
> if (host->board->wire4) {
> if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
> - mmc->caps |= MMC_CAP_4_BIT_DATA;
> + mmc->caps |= (MMC_CAP_SD_4_BIT_DATA | MMC_CAP_MMC_4_BIT_DATA);
> else
> printk("AT91 MMC: 4 wire bus mode not supported"
> " - using 1 wire\n");
> diff --git a/drivers/mmc/host/imxmmc.c b/drivers/mmc/host/imxmmc.c
> index f2070a1..67d4bc0 100644
> --- a/drivers/mmc/host/imxmmc.c
> +++ b/drivers/mmc/host/imxmmc.c
> @@ -975,7 +975,7 @@ static int imxmci_probe(struct platform_device *pdev)
> mmc->f_min = 150000;
> mmc->f_max = CLK_RATE/2;
> mmc->ocr_avail = MMC_VDD_32_33;
> - mmc->caps = MMC_CAP_4_BIT_DATA;
> + mmc->caps = (MMC_CAP_SD_4_BIT_DATA | MMC_CAP_MMC_4_BIT_DATA);
>
> /* MMC core transfer sizes tunable parameters */
> mmc->max_hw_segs = 64;
> diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
> index 971e18b..b1ae793 100644
> --- a/drivers/mmc/host/omap.c
> +++ b/drivers/mmc/host/omap.c
> @@ -1079,7 +1079,7 @@ static int __init mmc_omap_probe(struct platform_device *pdev)
> mmc->caps = MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
>
> if (minfo->wire4)
> - mmc->caps |= MMC_CAP_4_BIT_DATA;
> + mmc->caps |= (MMC_CAP_SD_4_BIT_DATA | MMC_CAP_MMC_4_BIT_DATA);
>
> /* Use scatterlist DMA to reduce per-transfer costs.
> * NOTE max_seg_size assumption that small blocks aren't
> diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
> index 1654a33..4fa00f1 100644
> --- a/drivers/mmc/host/pxamci.c
> +++ b/drivers/mmc/host/pxamci.c
> @@ -527,7 +527,7 @@ static int pxamci_probe(struct platform_device *pdev)
> mmc->caps = 0;
> host->cmdat = 0;
> if (!cpu_is_pxa21x() && !cpu_is_pxa25x()) {
> - mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
> + mmc->caps |= MMC_CAP_SD_4_BIT_DATA | MMC_CAP_MMC_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
> host->cmdat |= CMDAT_SDIO_INT_EN;
> }
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 785bbdc..09c4358 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1405,7 +1405,7 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
> mmc->ops = &sdhci_ops;
> mmc->f_min = host->max_clk / 256;
> mmc->f_max = host->max_clk;
> - mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_SDIO_IRQ;
> + mmc->caps = MMC_CAP_SD_4_BIT_DATA | MMC_CAP_MMC_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_SDIO_IRQ;
>
> if (caps & SDHCI_CAN_DO_HISPD)
> mmc->caps |= MMC_CAP_SD_HIGHSPEED;
> diff --git a/drivers/mmc/host/tifm_sd.c b/drivers/mmc/host/tifm_sd.c
> index 20d5c7b..78cad6b 100644
> --- a/drivers/mmc/host/tifm_sd.c
> +++ b/drivers/mmc/host/tifm_sd.c
> @@ -973,7 +973,7 @@ static int tifm_sd_probe(struct tifm_dev *sock)
>
> mmc->ops = &tifm_sd_ops;
> mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
> - mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE;
> + mmc->caps = MMC_CAP_SD_4_BIT_DATA | MMC_CAP_MMC_4_BIT_DATA | MMC_CAP_MULTIWRITE;
> mmc->f_min = 20000000 / 60;
> mmc->f_max = 24000000;
>
> diff --git a/drivers/mmc/host/wbsd.c b/drivers/mmc/host/wbsd.c
> index 4d5f374..70d6071 100644
> --- a/drivers/mmc/host/wbsd.c
> +++ b/drivers/mmc/host/wbsd.c
> @@ -1219,7 +1219,7 @@ static int __devinit wbsd_alloc_mmc(struct device *dev)
> mmc->f_min = 375000;
> mmc->f_max = 24000000;
> mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
> - mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE;
> + mmc->caps = MMC_CAP_SD_4_BIT_DATA | MMC_CAP_MMC_4_BIT_DATA | MMC_CAP_MULTIWRITE;
>
> spin_lock_init(&host->lock);
>
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index 7ab962f..142fa69 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -88,12 +88,13 @@ struct mmc_host {
>
> unsigned long caps; /* Host capabilities */
>
> -#define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */
> +#define MMC_CAP_SD_4_BIT_DATA (1 << 0) /* Can the host do SD 4 bit transfers */
> #define MMC_CAP_MULTIWRITE (1 << 1) /* Can accurately report bytes sent to card on error */
> #define MMC_CAP_MMC_HIGHSPEED (1 << 2) /* Can do MMC high-speed timing */
> #define MMC_CAP_SD_HIGHSPEED (1 << 3) /* Can do SD high-speed timing */
> #define MMC_CAP_SDIO_IRQ (1 << 4) /* Can signal pending SDIO IRQs */
> #define MMC_CAP_SPI (1 << 5) /* Talks only SPI protocols */
> +#define MMC_CAP_MMC_4_BIT_DATA (1 << 6) /* Can the host do MMC 4 bit transfers */
>
One suggestion:
#define MMC_CAP_4_BIT_DATA ( MMC_CAP_SD_4_BIT_DATA | MMC_CAP_MMC_4_BIT_DATA)
Then no need to change all MMC host drivers, like
drivers/mmc/host/wbsd.c
-Bryan Wu
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