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mmc: atmel-mci: change the state machine for compatibility with old IP 

The state machine use in atmel-mci can't work with old IP versions
(< 0x200).  This patch allows to have a common state machine for all
versions in order to remove at91-mci driver only used for old versions.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Ludovic Desroches 2012-05-16 15:25:59 +02:00 committed by Chris Ball
parent 7a90dcc2d7
commit f51775471a
1 changed files with 165 additions and 119 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

284
drivers/mmc/host/atmel-mci.c
View File

@ -45,19 +45,19 @@
#define ATMCI_DMA_THRESHOLD 16
enum {
EVENT_CMD_COMPLETE = 0,
EVENT_CMD_RDY = 0,
EVENT_XFER_COMPLETE,
EVENT_DATA_COMPLETE,
EVENT_NOTBUSY,
EVENT_DATA_ERROR,
};
enum atmel_mci_state {
STATE_IDLE = 0,
STATE_SENDING_CMD,
STATE_SENDING_DATA,
STATE_DATA_BUSY,
STATE_DATA_XFER,
STATE_WAITING_NOTBUSY,
STATE_SENDING_STOP,
STATE_DATA_ERROR,
STATE_END_REQUEST,
};
enum atmci_xfer_dir {
@ -709,7 +709,6 @@ static void atmci_pdc_complete(struct atmel_mci *host)
if (host->data) {
atmci_set_pending(host, EVENT_XFER_COMPLETE);
tasklet_schedule(&host->tasklet);
atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
}
}
@ -835,7 +834,7 @@ atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
} else {
dir = DMA_TO_DEVICE;
iflags |= ATMCI_ENDTX | ATMCI_TXBUFE;
iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE;
}
/* Set BLKLEN */
@ -975,8 +974,7 @@ static void atmci_stop_transfer(struct atmel_mci *host)
*/
static void atmci_stop_transfer_pdc(struct atmel_mci *host)
{
atmci_set_pending(host, EVENT_XFER_COMPLETE);
atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
}
static void atmci_stop_transfer_dma(struct atmel_mci *host)
@ -1012,6 +1010,7 @@ static void atmci_start_request(struct atmel_mci *host,
host->pending_events = 0;
host->completed_events = 0;
host->cmd_status = 0;
host->data_status = 0;
if (host->need_reset) {
@ -1029,7 +1028,7 @@ static void atmci_start_request(struct atmel_mci *host,
iflags = atmci_readl(host, ATMCI_IMR);
if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
iflags);
if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
@ -1367,19 +1366,6 @@ static void atmci_command_complete(struct atmel_mci *host,
cmd->error = -EIO;
else
cmd->error = 0;
if (cmd->error) {
dev_dbg(&host->pdev->dev,
"command error: status=0x%08x\n", status);
if (cmd->data) {
host->stop_transfer(host);
host->data = NULL;
atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY
| ATMCI_TXRDY | ATMCI_RXRDY
| ATMCI_DATA_ERROR_FLAGS);
}
}
}
static void atmci_detect_change(unsigned long data)
@ -1442,23 +1428,21 @@ static void atmci_detect_change(unsigned long data)
break;
case STATE_SENDING_CMD:
mrq->cmd->error = -ENOMEDIUM;
if (!mrq->data)
break;
/* fall through */
case STATE_SENDING_DATA:
if (mrq->data)
host->stop_transfer(host);
break;
case STATE_DATA_XFER:
mrq->data->error = -ENOMEDIUM;
host->stop_transfer(host);
break;
case STATE_DATA_BUSY:
case STATE_DATA_ERROR:
if (mrq->data->error == -EINPROGRESS)
mrq->data->error = -ENOMEDIUM;
if (!mrq->stop)
break;
/* fall through */
case STATE_WAITING_NOTBUSY:
mrq->data->error = -ENOMEDIUM;
break;
case STATE_SENDING_STOP:
mrq->stop->error = -ENOMEDIUM;
break;
case STATE_END_REQUEST:
break;
}
atmci_request_end(host, mrq);
@ -1486,7 +1470,6 @@ static void atmci_tasklet_func(unsigned long priv)
struct atmel_mci *host = (struct atmel_mci *)priv;
struct mmc_request *mrq = host->mrq;
struct mmc_data *data = host->data;
struct mmc_command *cmd = host->cmd;
enum atmel_mci_state state = host->state;
enum atmel_mci_state prev_state;
u32 status;
@ -1508,101 +1491,164 @@ static void atmci_tasklet_func(unsigned long priv)
break;
case STATE_SENDING_CMD:
/*
* Command has been sent, we are waiting for command
* ready. Then we have three next states possible:
* END_REQUEST by default, WAITING_NOTBUSY if it's a
* command needing it or DATA_XFER if there is data.
*/
if (!atmci_test_and_clear_pending(host,
EVENT_CMD_COMPLETE))
EVENT_CMD_RDY))
break;
host->cmd = NULL;
atmci_set_completed(host, EVENT_CMD_COMPLETE);
atmci_set_completed(host, EVENT_CMD_RDY);
atmci_command_complete(host, mrq->cmd);
if (!mrq->data || cmd->error) {
atmci_request_end(host, host->mrq);
goto unlock;
}
if (mrq->data) {
/*
* If there is a command error don't start
* data transfer.
*/
if (mrq->cmd->error) {
host->stop_transfer(host);
host->data = NULL;
atmci_writel(host, ATMCI_IDR,
ATMCI_TXRDY | ATMCI_RXRDY
| ATMCI_DATA_ERROR_FLAGS);
state = STATE_END_REQUEST;
} else
state = STATE_DATA_XFER;
} else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) {
atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
state = STATE_WAITING_NOTBUSY;
} else
state = STATE_END_REQUEST;
prev_state = state = STATE_SENDING_DATA;
/* fall through */
break;
case STATE_SENDING_DATA:
case STATE_DATA_XFER:
if (atmci_test_and_clear_pending(host,
EVENT_DATA_ERROR)) {
host->stop_transfer(host);
if (data->stop)
atmci_send_stop_cmd(host, data);
state = STATE_DATA_ERROR;
atmci_set_completed(host, EVENT_DATA_ERROR);
state = STATE_END_REQUEST;
break;
}
/*
* A data transfer is in progress. The event expected
* to move to the next state depends of data transfer
* type (PDC or DMA). Once transfer done we can move
* to the next step which is WAITING_NOTBUSY in write
* case and directly SENDING_STOP in read case.
*/
if (!atmci_test_and_clear_pending(host,
EVENT_XFER_COMPLETE))
break;
atmci_set_completed(host, EVENT_XFER_COMPLETE);
prev_state = state = STATE_DATA_BUSY;
/* fall through */
case STATE_DATA_BUSY:
if (!atmci_test_and_clear_pending(host,
EVENT_DATA_COMPLETE))
break;
host->data = NULL;
atmci_set_completed(host, EVENT_DATA_COMPLETE);
status = host->data_status;
if (unlikely(status & ATMCI_DATA_ERROR_FLAGS)) {
if (status & ATMCI_DTOE) {
dev_dbg(&host->pdev->dev,
"data timeout error\n");
data->error = -ETIMEDOUT;
} else if (status & ATMCI_DCRCE) {
dev_dbg(&host->pdev->dev,
"data CRC error\n");
data->error = -EILSEQ;
} else {
dev_dbg(&host->pdev->dev,
"data FIFO error (status=%08x)\n",
status);
data->error = -EIO;
}
if (host->data->flags & MMC_DATA_WRITE) {
atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
state = STATE_WAITING_NOTBUSY;
} else if (host->mrq->stop) {
atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
atmci_send_stop_cmd(host, data);
state = STATE_SENDING_STOP;
} else {
host->data = NULL;
data->bytes_xfered = data->blocks * data->blksz;
data->error = 0;
atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS);
state = STATE_END_REQUEST;
}
break;
if (!data->stop) {
atmci_request_end(host, host->mrq);
goto unlock;
}
case STATE_WAITING_NOTBUSY:
/*
* We can be in the state for two reasons: a command
* requiring waiting not busy signal (stop command
* included) or a write operation. In the latest case,
* we need to send a stop command.
*/
if (!atmci_test_and_clear_pending(host,
EVENT_NOTBUSY))
break;
prev_state = state = STATE_SENDING_STOP;
if (!data->error)
atmci_send_stop_cmd(host, data);
/* fall through */
atmci_set_completed(host, EVENT_NOTBUSY);
if (host->data) {
/*
* For some commands such as CMD53, even if
* there is data transfer, there is no stop
* command to send.
*/
if (host->mrq->stop) {
atmci_writel(host, ATMCI_IER,
ATMCI_CMDRDY);
atmci_send_stop_cmd(host, data);
state = STATE_SENDING_STOP;
} else {
host->data = NULL;
data->bytes_xfered = data->blocks
* data->blksz;
data->error = 0;
state = STATE_END_REQUEST;
}
} else
state = STATE_END_REQUEST;
break;
case STATE_SENDING_STOP:
/*
* In this state, it is important to set host->data to
* NULL (which is tested in the waiting notbusy state)
* in order to go to the end request state instead of
* sending stop again.
*/
if (!atmci_test_and_clear_pending(host,
EVENT_CMD_COMPLETE))
EVENT_CMD_RDY))
break;
host->cmd = NULL;
host->data = NULL;
data->bytes_xfered = data->blocks * data->blksz;
data->error = 0;
atmci_command_complete(host, mrq->stop);
if (mrq->stop->error) {
host->stop_transfer(host);
atmci_writel(host, ATMCI_IDR,
ATMCI_TXRDY | ATMCI_RXRDY
| ATMCI_DATA_ERROR_FLAGS);
state = STATE_END_REQUEST;
} else {
atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
state = STATE_WAITING_NOTBUSY;
}
break;
case STATE_END_REQUEST:
atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY
| ATMCI_DATA_ERROR_FLAGS);
status = host->data_status;
if (unlikely(status)) {
host->stop_transfer(host);
host->data = NULL;
if (status & ATMCI_DTOE) {
data->error = -ETIMEDOUT;
} else if (status & ATMCI_DCRCE) {
data->error = -EILSEQ;
} else {
data->error = -EIO;
}
}
atmci_request_end(host, host->mrq);
goto unlock;
case STATE_DATA_ERROR:
if (!atmci_test_and_clear_pending(host,
EVENT_XFER_COMPLETE))
break;
state = STATE_DATA_BUSY;
state = STATE_IDLE;
break;
}
} while (state != prev_state);
host->state = state;
unlock:
spin_unlock(&host->lock);
}
@ -1655,9 +1701,6 @@ static void atmci_read_data_pio(struct atmel_mci *host)
| ATMCI_DATA_ERROR_FLAGS));
host->data_status = status;
data->bytes_xfered += nbytes;
smp_wmb();
atmci_set_pending(host, EVENT_DATA_ERROR);
tasklet_schedule(&host->tasklet);
return;
}
} while (status & ATMCI_RXRDY);
@ -1726,9 +1769,6 @@ static void atmci_write_data_pio(struct atmel_mci *host)
| ATMCI_DATA_ERROR_FLAGS));
host->data_status = status;
data->bytes_xfered += nbytes;
smp_wmb();
atmci_set_pending(host, EVENT_DATA_ERROR);
tasklet_schedule(&host->tasklet);
return;
}
} while (status & ATMCI_TXRDY);
@ -1746,16 +1786,6 @@ done:
atmci_set_pending(host, EVENT_XFER_COMPLETE);
}
static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status)
{
atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
host->cmd_status = status;
smp_wmb();
atmci_set_pending(host, EVENT_CMD_COMPLETE);
tasklet_schedule(&host->tasklet);
}
static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
{
int i;
@ -1784,8 +1814,9 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
if (pending & ATMCI_DATA_ERROR_FLAGS) {
atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
| ATMCI_RXRDY | ATMCI_TXRDY);
pending &= atmci_readl(host, ATMCI_IMR);
| ATMCI_RXRDY | ATMCI_TXRDY
| ATMCI_ENDRX | ATMCI_ENDTX
| ATMCI_RXBUFF | ATMCI_TXBUFE);
host->data_status = status;
smp_wmb();
@ -1843,23 +1874,38 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
}
}
if (pending & ATMCI_NOTBUSY) {
atmci_writel(host, ATMCI_IDR,
ATMCI_DATA_ERROR_FLAGS | ATMCI_NOTBUSY);
if (!host->data_status)
host->data_status = status;
/*
* First mci IPs, so mainly the ones having pdc, have some
* issues with the notbusy signal. You can't get it after
* data transmission if you have not sent a stop command.
* The appropriate workaround is to use the BLKE signal.
*/
if (pending & ATMCI_BLKE) {
atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
smp_wmb();
atmci_set_pending(host, EVENT_DATA_COMPLETE);
atmci_set_pending(host, EVENT_NOTBUSY);
tasklet_schedule(&host->tasklet);
}
if (pending & ATMCI_NOTBUSY) {
atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
smp_wmb();
atmci_set_pending(host, EVENT_NOTBUSY);
tasklet_schedule(&host->tasklet);
}
if (pending & ATMCI_RXRDY)
atmci_read_data_pio(host);
if (pending & ATMCI_TXRDY)
atmci_write_data_pio(host);
if (pending & ATMCI_CMDRDY)
atmci_cmd_interrupt(host, status);
if (pending & ATMCI_CMDRDY) {
atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
host->cmd_status = status;
smp_wmb();
atmci_set_pending(host, EVENT_CMD_RDY);
tasklet_schedule(&host->tasklet);
}
if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
atmci_sdio_interrupt(host, status);