static int sdricoh_mmc_cmd(struct sdricoh_host *host, unsigned char opcode,
unsigned int arg)
{
unsigned int status;
int result = 0;
unsigned int loop = 0;
/* reset status reg? */
sdricoh_writel(host, R21C_STATUS, 0x18);
/* fill parameters */
sdricoh_writel(host, R204_CMD_ARG, arg);
sdricoh_writel(host, R200_CMD, (0x10000 << 8) | opcode);
/* wait for command completion */
if (opcode) {
for (loop = 0; loop < CMD_TIMEOUT; loop++) {
status = sdricoh_readl(host, R21C_STATUS);
sdricoh_writel(host, R2E4_STATUS_RESP, status);
if (status & STATUS_CMD_FINISHED)
break;
}
/* don't check for timeout in the loop it is not always
reset correctly
*/
if (loop == CMD_TIMEOUT || status & STATUS_CMD_TIMEOUT)
result = -ETIMEDOUT;
}
return result;
}
static int sdricoh_blockio(struct sdricoh_host *host, int read,
u8 *buf, int len)
{
int size;
u32 data = 0;
/* wait until the data is available */
if (read) {
if (sdricoh_query_status(host, STATUS_READY_TO_READ,
TRANSFER_TIMEOUT))
return -ETIMEDOUT;
sdricoh_writel(host, R21C_STATUS, 0x18);
/* read data */
while (len) {
data = sdricoh_readl(host, R230_DATA);
size = min(len, 4);
len -= size;
while (size) {
*buf = data & 0xFF;
buf++;
data >>= 8;
size--;
}
}
} else {
if (sdricoh_query_status(host, STATUS_READY_TO_WRITE,
static int sdricoh_query_status(struct sdricoh_host *host, unsigned int wanted,
unsigned int timeout){
unsigned int loop;
unsigned int status = 0;
struct device *dev = host->dev;
for (loop = 0; loop < timeout; loop++) {
status = sdricoh_readl(host, R21C_STATUS);
sdricoh_writel(host, R2E4_STATUS_RESP, status);
if (status & wanted)
break;
}
if (loop == timeout) {
dev_err(dev, "query_status: timeout waiting for %x\n", wanted);
return -ETIMEDOUT;
}
/* do not do this check in the loop as some commands fail otherwise */
if (status & 0x7F0000) {
dev_err(dev, "waiting for status bit %x failed\n", wanted);
return -EINVAL;
}
return 0;
}
static int sdricoh_reset(struct sdricoh_host *host)
{
dev_dbg(host->dev, "reset\n");
sdricoh_writel(host, R2F0_RESET, 0x10001);
sdricoh_writel(host, R2E0_INIT, 0x10000);
if (sdricoh_readl(host, R2E0_INIT) != 0x10000)
return -EIO;
sdricoh_writel(host, R2E0_INIT, 0x10007);
sdricoh_writel(host, R224_MODE, 0x2000000);
sdricoh_writel(host, R228_POWER, 0xe0);
/* status register ? */
sdricoh_writel(host, R21C_STATUS, 0x18);
return 0;
}
