/*
* This is the only exported function
*
* Call it with the MCI register base address
*/
int atmel_mci_init(void *regs)
{
struct mmc *mmc = malloc(sizeof(struct mmc));
if (!mmc)
return -1;
strcpy(mmc->name, "mci");
mmc->priv = regs;
mmc->send_cmd = mci_send_cmd;
mmc->set_ios = mci_set_ios;
mmc->init = mci_init;
mmc->getcd = NULL;
mmc->getwp = NULL;
/* 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;
/*
* min and max frequencies determined by
* max and min of clock divider
*/
mmc->f_min = get_mci_clk_rate() / (2*256);
mmc->f_max = get_mci_clk_rate() / (2*1);
mmc->b_max = 0;
mmc_register(mmc);
return 0;
}
/* Setup for MCI Clock and Block Size */
static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen)
{
atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
u32 bus_hz = get_mci_clk_rate();
u32 clkdiv = 255;
debug("mci: bus_hz is %u, setting clock %u Hz, block size %u\n",
bus_hz, hz, blklen);
if (hz > 0) {
/* find lowest clkdiv yielding a rate <= than requested */
for (clkdiv=0; clkdiv<255; clkdiv++) {
if ((bus_hz / (clkdiv+1) / 2) <= hz)
break;
}
}
printf("mci: setting clock %u Hz, block size %u\n",
(bus_hz / (clkdiv+1)) / 2, blklen);
blklen &= 0xfffc;
/* On some platforms RDPROOF and WRPROOF are ignored */
writel((MMCI_BF(CLKDIV, clkdiv)
| MMCI_BF(BLKLEN, blklen)
| MMCI_BIT(RDPROOF)
| MMCI_BIT(WRPROOF)), &mci->mr);
/*
* On some new platforms BLKLEN in mci->mr is ignored.
* Should use the BLKLEN in the block register.
*/
writel(MMCI_BF(BLKLEN, blklen), &mci->blkr);
initialized = 1;
}
/* Setup for MCI Clock and Block Size */
static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen)
{
struct atmel_mci_priv *priv = mmc->priv;
atmel_mci_t *mci = priv->mci;
u32 bus_hz = get_mci_clk_rate();
u32 clkdiv = 255;
unsigned int version = atmel_mci_get_version(mci);
u32 clkodd = 0;
u32 mr;
debug("mci: bus_hz is %u, setting clock %u Hz, block size %u\n",
bus_hz, hz, blklen);
if (hz > 0) {
if (version >= 0x500) {
clkdiv = DIV_ROUND_UP(bus_hz, hz) - 2;
if (clkdiv > 511)
clkdiv = 511;
clkodd = clkdiv & 1;
clkdiv >>= 1;
debug("mci: setting clock %u Hz, block size %u\n",
bus_hz / (clkdiv * 2 + clkodd + 2), blklen);
} else {
/* find clkdiv yielding a rate <= than requested */
for (clkdiv = 0; clkdiv < 255; clkdiv++) {
static void mci_set_mode(unsigned long hz, unsigned long blklen)
{
unsigned long bus_hz;
unsigned long clkdiv;
bus_hz = get_mci_clk_rate();
clkdiv = (bus_hz / hz) / 2 - 1;
pr_debug("mmc: setting clock %lu Hz, block size %lu\n",
hz, blklen);
if (clkdiv & ~255UL) {
clkdiv = 255;
printf("mmc: clock %lu too low; setting CLKDIV to 255\n",
hz);
}
blklen &= 0xfffc;
mmci_writel(MR, (MMCI_BF(CLKDIV, clkdiv)
| MMCI_BF(BLKLEN, blklen)
| MMCI_BIT(RDPROOF)
| MMCI_BIT(WRPROOF)));
}
