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SubjectRe: [PATCH V4 2/7] mmc: sdhci: Change SDMA address register for v4 mode
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Date
On 24/07/18 05:47, Chunyan Zhang wrote:
> According to the SD host controller specification version 4.10, when
> Host Version 4 is enabled, SDMA uses ADMA System Address register
> (05Fh-058h) instead of using SDMA System Address register to
> support both 32-bit and 64-bit addressing.
>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
> ---
> drivers/mmc/host/sdhci.c | 31 +++++++++++++++++++++----------
> 1 file changed, 21 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index cab5350..b7ad8e5 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -729,7 +729,7 @@ static void sdhci_adma_table_post(struct sdhci_host *host,
> }
> }
>
> -static u32 sdhci_sdma_address(struct sdhci_host *host)
> +static dma_addr_t sdhci_sdma_address(struct sdhci_host *host)
> {
> if (host->bounce_buffer)
> return host->bounce_addr;
> @@ -737,6 +737,18 @@ static u32 sdhci_sdma_address(struct sdhci_host *host)
> return sg_dma_address(host->data->sg);
> }
>
> +static void sdhci_set_sdma_addr(struct sdhci_host *host, dma_addr_t addr)
> +{
> + if (host->v4_mode) {
> + sdhci_writel(host, addr, SDHCI_ADMA_ADDRESS);
> + if (host->flags & SDHCI_USE_64_BIT_DMA)
> + sdhci_writel(host, (u64)addr >> 32, SDHCI_ADMA_ADDRESS_HI);
> + } else {
> + sdhci_writel(host, addr, SDHCI_DMA_ADDRESS);
> + }
> +

Please remove this blank line

> +}
> +
> static unsigned int sdhci_target_timeout(struct sdhci_host *host,
> struct mmc_command *cmd,
> struct mmc_data *data)
> @@ -996,8 +1008,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
> SDHCI_ADMA_ADDRESS_HI);
> } else {
> WARN_ON(sg_cnt != 1);
> - sdhci_writel(host, sdhci_sdma_address(host),
> - SDHCI_DMA_ADDRESS);
> + sdhci_set_sdma_addr(host, sdhci_sdma_address(host));
> }
> }
>
> @@ -2824,7 +2835,7 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
> * some controllers are faulty, don't trust them.
> */
> if (intmask & SDHCI_INT_DMA_END) {
> - u32 dmastart, dmanow;
> + dma_addr_t dmastart, dmanow;
>
> dmastart = sdhci_sdma_address(host);
> dmanow = dmastart + host->data->bytes_xfered;
> @@ -2832,12 +2843,12 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
> * Force update to the next DMA block boundary.
> */
> dmanow = (dmanow &
> - ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
> + ~((dma_addr_t)SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
> SDHCI_DEFAULT_BOUNDARY_SIZE;
> host->data->bytes_xfered = dmanow - dmastart;
> - DBG("DMA base 0x%08x, transferred 0x%06x bytes, next 0x%08x\n",
> - dmastart, host->data->bytes_xfered, dmanow);
> - sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
> + DBG("DMA base %pad, transferred 0x%06x bytes, next %pad\n",
> + &dmastart, host->data->bytes_xfered, &dmanow);
> + sdhci_set_sdma_addr(host, dmanow);
> }
>
> if (intmask & SDHCI_INT_DATA_END) {
> @@ -3581,8 +3592,8 @@ int sdhci_setup_host(struct sdhci_host *host)
> }
> }
>
> - /* SDMA does not support 64-bit DMA */
> - if (host->flags & SDHCI_USE_64_BIT_DMA)
> + /* SDMA does not support 64-bit DMA if v4 mode not set */
> + if ((host->flags & SDHCI_USE_64_BIT_DMA) && !host->v4_mode)
> host->flags &= ~SDHCI_USE_SDMA;
>
> if (host->flags & SDHCI_USE_ADMA) {
>

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