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mmc: atmel_mci: using IP version for different setting

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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>
This commit is contained in:
Bo Shen 2013-04-26 00:27:06 +00:00 committed by Andreas Bießmann
parent 248020734b
commit aac4b69b2c
2 changed files with 40 additions and 4 deletions
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42
drivers/mmc/gen_atmel_mci.c
View File

@ -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 @@ mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
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 @@ static void mci_set_ios(struct mmc *mmc)
/*
* 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 @@ static int mci_init(struct mmc *mmc)
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 @@ int atmel_mci_init(void *regs)
/* 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

2
include/atmel_mci.h
View File

@ -52,6 +52,8 @@ typedef struct atmel_mci {
u32 ier; /* 0x44 */
u32 idr; /* 0x48 */
u32 imr; /* 0x4c */
u32 reserved[43];
u32 version;
} atmel_mci_t;
#endif /* __ASSEMBLY__ */