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Subject[PATCH V4 2/7] mmc: sdhci: Change SDMA address register for v4 mode
Date
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);
+ }
+
+}
+
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) {
--
2.7.4
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