summaryrefslogtreecommitdiffstats
path: root/drivers/mmc
diff options
context:
space:
mode:
authorKuninori Morimoto <kuninori.morimoto.gx@renesas.com>2014-09-10 09:23:24 +0200
committerUlf Hansson <ulf.hansson@linaro.org>2014-09-19 20:36:15 +0200
commitb9bd7ff8069a7125da897de657da421c497d4f15 (patch)
tree32e6f0a4ae9fee954c2dfb48370bdc69445e75d6 /drivers/mmc
parentmmc: block: change stop errors to info (diff)
downloadlinux-b9bd7ff8069a7125da897de657da421c497d4f15.tar.xz
linux-b9bd7ff8069a7125da897de657da421c497d4f15.zip
mmc: tmio: enable odd number size access
Current tmio is using sd_ctrl_read16/write16_rep() for data transfer. It works if transfer size was even number, but, last 1 byte will be ignored if transfer size was odd number. This patch adds new tmio_mmc_transfer_data() and solve this issue. Tested-by: Shinobu Uehara <shinobu.uehara.xc@renesas.com> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/tmio_mmc_pio.c39
1 files changed, 35 insertions, 4 deletions
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index ff5ff0f725c9..692e578cf4d7 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -376,6 +376,40 @@ static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command
return 0;
}
+static void tmio_mmc_transfer_data(struct tmio_mmc_host *host,
+ unsigned short *buf,
+ unsigned int count)
+{
+ int is_read = host->data->flags & MMC_DATA_READ;
+ u8 *buf8;
+
+ /*
+ * Transfer the data
+ */
+ if (is_read)
+ sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
+ else
+ sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
+
+ /* if count was even number */
+ if (!(count & 0x1))
+ return;
+
+ /* if count was odd number */
+ buf8 = (u8 *)(buf + (count >> 1));
+
+ /*
+ * FIXME
+ *
+ * driver and this function are assuming that
+ * it is used as little endian
+ */
+ if (is_read)
+ *buf8 = sd_ctrl_read16(host, CTL_SD_DATA_PORT) & 0xff;
+ else
+ sd_ctrl_write16(host, CTL_SD_DATA_PORT, *buf8);
+}
+
/*
* This chip always returns (at least?) as much data as you ask for.
* I'm unsure what happens if you ask for less than a block. This should be
@@ -408,10 +442,7 @@ static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
count, host->sg_off, data->flags);
/* Transfer the data */
- if (data->flags & MMC_DATA_READ)
- sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
- else
- sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
+ tmio_mmc_transfer_data(host, buf, count);
host->sg_off += count;