Hi Jerry,
On Fri, Jan 06 2012, r66...@freescale.com wrote:
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 2db0d5c..d5a2259 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -832,14 +832,29 @@ static void sdhci_prepare_data(struct sdhci_host *host,
> struct mmc_command *cmd)
> * is ADMA.
> */
> if (host->version >= SDHCI_SPEC_200) {
> - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> - ctrl &= ~SDHCI_CTRL_DMA_MASK;
> - if ((host->flags & SDHCI_REQ_USE_DMA) &&
> - (host->flags & SDHCI_USE_ADMA))
> - ctrl |= SDHCI_CTRL_ADMA32;
> - else
> - ctrl |= SDHCI_CTRL_SDMA;
> - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> + if (host->quirks2 & SDHCI_QUIRK2_QORIQ_PROCTL_WEIRD) {
> +#define ESDHCI_PROCTL_DMAS_MASK 0x00000300
> +#define ESDHCI_PROCTL_ADMA32 0x00000200
> +#define ESDHCI_PROCTL_SDMA 0x00000000
> + u32 ctrl;
> + ctrl = sdhci_readl(host, SDHCI_HOST_CONTROL);
> + ctrl &= ~ESDHCI_PROCTL_DMAS_MASK;
> + if ((host->flags & SDHCI_REQ_USE_DMA) &&
> + (host->flags & SDHCI_USE_ADMA))
> + ctrl |= ESDHCI_PROCTL_ADMA32;
> + else
> + ctrl |= ESDHCI_PROCTL_SDMA;
> + sdhci_writel(host, ctrl, SDHCI_HOST_CONTROL);
> + } else {
> + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> + ctrl &= ~SDHCI_CTRL_DMA_MASK;
> + if ((host->flags & SDHCI_REQ_USE_DMA) &&
> + (host->flags & SDHCI_USE_ADMA))
> + ctrl |= SDHCI_CTRL_ADMA32;
> + else
> + ctrl |= SDHCI_CTRL_SDMA;
> + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> + }
drivers/mmc/host/sdhci.c must know nothing about ESDHC registers.
It's a generic driver. We can add hooks so that your own driver
can run code in the right place instead.
Thanks,
- Chris.
--
Chris Ball <c...@laptop.org> <http://printf.net/>
One Laptop Per Child
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