mmc: atmel_mci: using IP version for different setting
Using IP version for different setting
- Higher version supports 8bit mode
- Higher version bus width setting is different
Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/drivers/mmc/gen_atmel_mci.c b/drivers/mmc/gen_atmel_mci.c
index 70a9f91..fc0a181 100644
--- a/drivers/mmc/gen_atmel_mci.c
+++ b/drivers/mmc/gen_atmel_mci.c
@@ -50,6 +50,12 @@
static int initialized = 0;
+/* Read Atmel MCI IP version */
+static unsigned int atmel_mci_get_version(struct atmel_mci *mci)
+{
+ return readl(&mci->version) & 0x00000fff;
+}
+
/*
* Print command and status:
*
@@ -297,7 +303,9 @@
static void mci_set_ios(struct mmc *mmc)
{
atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
- int busw = (mmc->bus_width == 4) ? 1 : 0;
+ int bus_width = mmc->bus_width;
+ unsigned int version = atmel_mci_get_version(mci);
+ int busw;
/* Set the clock speed */
mci_set_mode(mmc, mmc->clock, MMC_DEFAULT_BLKLEN);
@@ -305,9 +313,26 @@
/*
* set the bus width and select slot for this interface
* there is no capability for multiple slots on the same interface yet
- * Bitfield SCDBUS needs to be expanded to 2 bits for 8-bit buses
*/
- writel(MMCI_BF(SCDBUS, busw) | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
+ if ((version & 0xf00) >= 0x300) {
+ switch (bus_width) {
+ case 8:
+ busw = 3;
+ break;
+ case 4:
+ busw = 2;
+ break;
+ default:
+ busw = 0;
+ break;
+ }
+
+ writel(busw << 6 | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
+ } else {
+ busw = (bus_width == 4) ? 1 : 0;
+
+ writel(busw << 7 | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
+ }
}
/* Entered into mmc structure during driver init */
@@ -340,9 +365,12 @@
int atmel_mci_init(void *regs)
{
struct mmc *mmc = malloc(sizeof(struct mmc));
+ struct atmel_mci *mci;
+ unsigned int version;
if (!mmc)
return -1;
+
strcpy(mmc->name, "mci");
mmc->priv = regs;
mmc->send_cmd = mci_send_cmd;
@@ -353,7 +381,13 @@
/* need to be able to pass these in on a board by board basis */
mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
- mmc->host_caps = MMC_MODE_4BIT;
+ mci = (struct atmel_mci *)mmc->priv;
+ version = atmel_mci_get_version(mci);
+ if ((version & 0xf00) >= 0x300)
+ mmc->host_caps = MMC_MODE_8BIT;
+
+ mmc->host_caps |= MMC_MODE_4BIT;
+
/*
* min and max frequencies determined by
* max and min of clock divider