/**
* __mmc_switch - modify EXT_CSD register
* @card: the MMC card associated with the data transfer
* @set: cmd set values
* @index: EXT_CSD register index
* @value: value to program into EXT_CSD register
* @timeout_ms: timeout (ms) for operation performed by register write,
* timeout of zero implies maximum possible timeout
* @use_busy_signal: use the busy signal as response type
* @send_status: send status cmd to poll for busy
* @ignore_crc: ignore CRC errors when sending status cmd to poll for busy
*
* Modifies the EXT_CSD register for selected card.
*/
int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
unsigned int timeout_ms, bool use_busy_signal, bool send_status,
bool ignore_crc)
{
struct mmc_host *host = card->host;
int err;
struct mmc_command cmd = {0};
unsigned long timeout;
u32 status = 0;
bool use_r1b_resp = use_busy_signal;
bool expired = false;
mmc_retune_hold(host);
/*
* If the cmd timeout and the max_busy_timeout of the host are both
* specified, let's validate them. A failure means we need to prevent
* the host from doing hw busy detection, which is done by converting
* to a R1 response instead of a R1B.
*/
if (timeout_ms && host->max_busy_timeout &&
(timeout_ms > host->max_busy_timeout))
use_r1b_resp = false;
cmd.opcode = MMC_SWITCH;
cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
(index << 16) |
(value << 8) |
set;
cmd.flags = MMC_CMD_AC;
if (use_r1b_resp) {
cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
/*
* A busy_timeout of zero means the host can decide to use
* whatever value it finds suitable.
*/
cmd.busy_timeout = timeout_ms;
} else {
cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
}
if (index == EXT_CSD_SANITIZE_START)
cmd.sanitize_busy = true;
err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
if (err)
goto out;
/* No need to check card status in case of unblocking command */
if (!use_busy_signal)
goto out;
/*
* CRC errors shall only be ignored in cases were CMD13 is used to poll
* to detect busy completion.
*/
if ((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
ignore_crc = false;
/* We have an unspecified cmd timeout, use the fallback value. */
if (!timeout_ms)
timeout_ms = MMC_OPS_TIMEOUT_MS;
/* Must check status to be sure of no errors. */
timeout = jiffies + msecs_to_jiffies(timeout_ms);
do {
if (send_status) {
/*
* Due to the possibility of being preempted after
* sending the status command, check the expiration
* time first.
*/
expired = time_after(jiffies, timeout);
err = __mmc_send_status(card, &status, ignore_crc);
if (err)
goto out;
}
if ((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
break;
if (mmc_host_is_spi(host))
break;
/*
* We are not allowed to issue a status command and the host
* does'nt support MMC_CAP_WAIT_WHILE_BUSY, then we can only
* rely on waiting for the stated timeout to be sufficient.
*/
if (!send_status) {
mmc_delay(timeout_ms);
goto out;
}
/* Timeout if the device never leaves the program state. */
if (expired && R1_CURRENT_STATE(status) == R1_STATE_PRG) {
pr_err("%s: Card stuck in programming state! %s\n",
mmc_hostname(host), __func__);
err = -ETIMEDOUT;
goto out;
}
} while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
err = mmc_switch_status_error(host, status);
out:
mmc_retune_release(host);
return err;
}
/**
* __mmc_switch - modify EXT_CSD register
* @card: the MMC card associated with the data transfer
* @set: cmd set values
* @index: EXT_CSD register index
* @value: value to program into EXT_CSD register
* @timeout_ms: timeout (ms) for operation performed by register write,
* timeout of zero implies maximum possible timeout
* @timing: new timing to change to
* @use_busy_signal: use the busy signal as response type
* @send_status: send status cmd to poll for busy
* @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
*
* Modifies the EXT_CSD register for selected card.
*/
int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
unsigned int timeout_ms, unsigned char timing,
bool use_busy_signal, bool send_status, bool retry_crc_err)
{
struct mmc_host *host = card->host;
int err;
struct mmc_command cmd = {};
bool use_r1b_resp = use_busy_signal;
unsigned char old_timing = host->ios.timing;
mmc_retune_hold(host);
/*
* If the cmd timeout and the max_busy_timeout of the host are both
* specified, let's validate them. A failure means we need to prevent
* the host from doing hw busy detection, which is done by converting
* to a R1 response instead of a R1B.
*/
if (timeout_ms && host->max_busy_timeout &&
(timeout_ms > host->max_busy_timeout))
use_r1b_resp = false;
cmd.opcode = MMC_SWITCH;
cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
(index << 16) |
(value << 8) |
set;
cmd.flags = MMC_CMD_AC;
if (use_r1b_resp) {
cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
/*
* A busy_timeout of zero means the host can decide to use
* whatever value it finds suitable.
*/
cmd.busy_timeout = timeout_ms;
} else {
cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
}
if (index == EXT_CSD_SANITIZE_START)
cmd.sanitize_busy = true;
err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
if (err)
goto out;
/* No need to check card status in case of unblocking command */
if (!use_busy_signal)
goto out;
/*If SPI or used HW busy detection above, then we don't need to poll. */
if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
mmc_host_is_spi(host))
goto out_tim;
/* Let's try to poll to find out when the command is completed. */
err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err);
if (err)
goto out;
out_tim:
/* Switch to new timing before check switch status. */
if (timing)
mmc_set_timing(host, timing);
if (send_status) {
err = mmc_switch_status(card);
if (err && timing)
mmc_set_timing(host, old_timing);
}
out:
mmc_retune_release(host);
return err;
}
