From: Sascha Hauer <s.hauer@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/2] mci: implement multi block write
Date: Fri, 11 Nov 2011 12:38:13 +0100 [thread overview]
Message-ID: <1321011494-4274-2-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1321011494-4274-1-git-send-email-s.hauer@pengutronix.de>
This speeds up writes to MMC/SD cards significantly.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
drivers/mci/mci-core.c | 30 ++++++++++++++++++++++++++----
1 files changed, 26 insertions(+), 4 deletions(-)
diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index 09f7e29..58f7f6d 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -107,12 +107,20 @@ static void *sector_buf;
* @return Transaction status (0 on success)
*/
#ifdef CONFIG_MCI_WRITE
-static int mci_block_write(struct device_d *mci_dev, const void *src, unsigned blocknum)
+static int mci_block_write(struct device_d *mci_dev, const void *src, unsigned blocknum,
+ int blocks)
{
struct mci *mci = GET_MCI_DATA(mci_dev);
struct mci_cmd cmd;
struct mci_data data;
const void *buf;
+ unsigned mmccmd;
+ int ret;
+
+ if (blocks > 1)
+ mmccmd = MMC_CMD_WRITE_MULTIPLE_BLOCK;
+ else
+ mmccmd = MMC_CMD_WRITE_SINGLE_BLOCK;
if ((unsigned long)src & 0x3) {
memcpy(sector_buf, src, 512);
@@ -122,16 +130,30 @@ static int mci_block_write(struct device_d *mci_dev, const void *src, unsigned b
}
mci_setup_cmd(&cmd,
- MMC_CMD_WRITE_SINGLE_BLOCK,
+ mmccmd,
mci->high_capacity != 0 ? blocknum : blocknum * mci->write_bl_len,
MMC_RSP_R1);
data.src = buf;
- data.blocks = 1;
+ data.blocks = blocks;
data.blocksize = mci->write_bl_len;
data.flags = MMC_DATA_WRITE;
- return mci_send_cmd(mci_dev, &cmd, &data);
+ ret = mci_send_cmd(mci_dev, &cmd, &data);
+ if (ret)
+ return ret;
+
+
+ if (blocks > 1) {
+ mci_setup_cmd(&cmd,
+ MMC_CMD_STOP_TRANSMISSION,
+ 0, MMC_RSP_R1b);
+ ret = mci_send_cmd(mci_dev, &cmd, NULL);
+ if (ret)
+ return ret;
+ }
+
+ return ret;
}
#endif
--
1.7.7.1
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next prev parent reply other threads:[~2011-11-11 11:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-11 11:38 [PATCH] mci multiblock write Sascha Hauer
2011-11-11 11:38 ` Sascha Hauer [this message]
2011-11-11 11:47 ` [PATCH 1/2] mci: implement multi block write Belisko Marek
2011-11-11 11:59 ` Sascha Hauer
2011-11-11 11:38 ` [PATCH 2/2] mci: remove unnecessary loops Sascha Hauer
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