[PATCH] mmc: wbsd Secure Digital support
Add support for Secure Digital specific features in the wbsd driver. Adds
support for read-only switch and wide bus transfers.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/mmc/wbsd.c b/drivers/mmc/wbsd.c
index 08ae22a..dec01d3 100644
--- a/drivers/mmc/wbsd.c
+++ b/drivers/mmc/wbsd.c
@@ -720,11 +720,28 @@
* calculate CRC.
*
* Space for CRC must be included in the size.
+ * Two bytes are needed for each data line.
*/
- blksize = (1 << data->blksz_bits) + 2;
+ if (host->bus_width == MMC_BUS_WIDTH_1)
+ {
+ blksize = (1 << data->blksz_bits) + 2;
+
+ wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
+ wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
+ }
+ else if (host->bus_width == MMC_BUS_WIDTH_4)
+ {
+ blksize = (1 << data->blksz_bits) + 2 * 4;
- wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
- wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
+ wbsd_write_index(host, WBSD_IDX_PBSMSB, ((blksize >> 4) & 0xF0)
+ | WBSD_DATA_WIDTH);
+ wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
+ }
+ else
+ {
+ data->error = MMC_ERR_INVALID;
+ return;
+ }
/*
* Clear the FIFO. This is needed even for DMA
@@ -960,9 +977,9 @@
struct wbsd_host* host = mmc_priv(mmc);
u8 clk, setup, pwr;
- DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u\n",
- ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
- ios->vdd);
+ DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
+ ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
+ ios->vdd, ios->bus_width);
spin_lock_bh(&host->lock);
@@ -1010,6 +1027,7 @@
setup = wbsd_read_index(host, WBSD_IDX_SETUP);
if (ios->chip_select == MMC_CS_HIGH)
{
+ BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
setup |= WBSD_DAT3_H;
host->flags |= WBSD_FIGNORE_DETECT;
}
@@ -1025,12 +1043,41 @@
}
wbsd_write_index(host, WBSD_IDX_SETUP, setup);
+ /*
+ * Store bus width for later. Will be used when
+ * setting up the data transfer.
+ */
+ host->bus_width = ios->bus_width;
+
spin_unlock_bh(&host->lock);
}
+static int wbsd_get_ro(struct mmc_host* mmc)
+{
+ struct wbsd_host* host = mmc_priv(mmc);
+ u8 csr;
+
+ spin_lock_bh(&host->lock);
+
+ csr = inb(host->base + WBSD_CSR);
+ csr |= WBSD_MSLED;
+ outb(csr, host->base + WBSD_CSR);
+
+ mdelay(1);
+
+ csr = inb(host->base + WBSD_CSR);
+ csr &= ~WBSD_MSLED;
+ outb(csr, host->base + WBSD_CSR);
+
+ spin_unlock_bh(&host->lock);
+
+ return csr & WBSD_WRPT;
+}
+
static struct mmc_host_ops wbsd_ops = {
.request = wbsd_request,
.set_ios = wbsd_set_ios,
+ .get_ro = wbsd_get_ro,
};
/*****************************************************************************\
@@ -1355,6 +1402,7 @@
mmc->f_min = 375000;
mmc->f_max = 24000000;
mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
+ mmc->caps = MMC_CAP_4_BIT_DATA;
spin_lock_init(&host->lock);