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authorBen Dooks <ben-linux@fluff.org>2010-03-05 13:43:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-06 11:26:36 -0800
commit118cd17d4137f34c747c32765c1cb4d3910c04d4 (patch)
tree37770764fb27313fa15ebb1bc29c13673614f185 /drivers/mmc
parent3fb7fb4a01d09f81d1daaf65e52d929734bd691f (diff)
sdhci: add adma descriptor set call
The code to write the ADMA descriptor into memory is repeated several times throughout sdhci_adma_table_pre, and thus should be moved into a common function. This will also be useful if the patch to make the write more efficient is accepted. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Cc: Pierre Ossman <pierre@ossman.eu> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci.c50
1 files changed, 20 insertions, 30 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c279fbc4c2e..fcdd0078503 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -376,6 +376,20 @@ static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
local_irq_restore(*flags);
}
+static void sdhci_set_adma_desc(u8 *desc, u32 addr, int len, unsigned cmd)
+{
+ desc[7] = (addr >> 24) & 0xff;
+ desc[6] = (addr >> 16) & 0xff;
+ desc[5] = (addr >> 8) & 0xff;
+ desc[4] = (addr >> 0) & 0xff;
+
+ desc[3] = (len >> 8) & 0xff;
+ desc[2] = (len >> 0) & 0xff;
+
+ desc[0] = cmd & 0xff;
+ desc[1] = cmd >> 8;
+}
+
static int sdhci_adma_table_pre(struct sdhci_host *host,
struct mmc_data *data)
{
@@ -443,19 +457,11 @@ static int sdhci_adma_table_pre(struct sdhci_host *host,
sdhci_kunmap_atomic(buffer, &flags);
}
- desc[7] = (align_addr >> 24) & 0xff;
- desc[6] = (align_addr >> 16) & 0xff;
- desc[5] = (align_addr >> 8) & 0xff;
- desc[4] = (align_addr >> 0) & 0xff;
+ /* tran, valid */
+ sdhci_set_adma_desc(desc, align_addr, offset, 0x21);
BUG_ON(offset > 65536);
- desc[3] = (offset >> 8) & 0xff;
- desc[2] = (offset >> 0) & 0xff;
-
- desc[1] = 0x00;
- desc[0] = 0x21; /* tran, valid */
-
align += 4;
align_addr += 4;
@@ -465,19 +471,10 @@ static int sdhci_adma_table_pre(struct sdhci_host *host,
len -= offset;
}
- desc[7] = (addr >> 24) & 0xff;
- desc[6] = (addr >> 16) & 0xff;
- desc[5] = (addr >> 8) & 0xff;
- desc[4] = (addr >> 0) & 0xff;
-
BUG_ON(len > 65536);
- desc[3] = (len >> 8) & 0xff;
- desc[2] = (len >> 0) & 0xff;
-
- desc[1] = 0x00;
- desc[0] = 0x21; /* tran, valid */
-
+ /* tran, valid */
+ sdhci_set_adma_desc(desc, addr, len, 0x21);
desc += 8;
/*
@@ -490,16 +487,9 @@ static int sdhci_adma_table_pre(struct sdhci_host *host,
/*
* Add a terminating entry.
*/
- desc[7] = 0;
- desc[6] = 0;
- desc[5] = 0;
- desc[4] = 0;
-
- desc[3] = 0;
- desc[2] = 0;
- desc[1] = 0x00;
- desc[0] = 0x03; /* nop, end, valid */
+ /* nop, end, valid */
+ sdhci_set_adma_desc(desc, 0, 0, 0x3);
/*
* Resync align buffer as we might have changed it.