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>
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c279fbc..fcdd007 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -376,6 +376,20 @@
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 @@
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 @@
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 @@
/*
* 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.
