Description
Source
Call Graph
Start Line: 428
void MCI_Handler(Mci *pMci)
{
AT91S_MCI *pMciHw = pMci->pMciHw;
MciCmd *pCommand = pMci->pCommand;
unsigned int status;
unsigned char i;
#if defined(at91rm9200)
unsigned int mciCr, mciSdcr, mciMr, mciDtor;
#endif
SANITY_CHECK(pMci);
SANITY_CHECK(pMciHw);
SANITY_CHECK(pCommand);
// Read the status register
status = READ_MCI(pMciHw, MCI_SR) & READ_MCI(pMciHw, MCI_IMR);
// TRACE_DEBUG("status %x\n\r", status);
// Check if an error has occured
if ((status & STATUS_ERRORS) != 0) {
// Check error code
if ((status & STATUS_ERRORS) == AT91C_MCI_RTOE) {
pCommand->status = MCI_STATUS_NORESPONSE;
}
// if the command is SEND_OP_COND the CRC error flag is always present
// (cf : R3 response)
else if (((status & STATUS_ERRORS) != AT91C_MCI_RCRCE)
|| ((pCommand->cmd != SDCARD_APP_OP_COND_CMD)
&& (pCommand->cmd != MMC_SEND_OP_COND_CMD))) {
pCommand->status = MCI_STATUS_ERROR;
}
}
// Check if a transfer has been completed
if (((status & AT91C_MCI_CMDRDY) != 0)
|| ((status & AT91C_MCI_ENDRX) != 0)
|| ((status & AT91C_MCI_RXBUFF) != 0)
|| ((status & AT91C_MCI_ENDTX) != 0)
|| ((status & AT91C_MCI_BLKE) != 0)
|| ((status & AT91C_MCI_RTOE) != 0)) {
if (((status & AT91C_MCI_ENDRX) != 0)
|| ((status & AT91C_MCI_RXBUFF) != 0)
|| ((status & AT91C_MCI_ENDTX) != 0)) {
MCI_Enable(pMci, DISABLE);
}
#if defined(at91rm9200)
if ((pCommand->cmd & AT91C_MCI_TRCMD_STOP) != 0) {
mciMr = READ_MCI(pMciHw, MCI_MR);
mciSdcr = READ_MCI(pMciHw, MCI_SDCR);
mciDtor = READ_MCI(pMciHw, MCI_DTOR);
WRITE_MCI(pMciHw, MCI_CR, AT91C_MCI_SWRST);
// TRACE_DEBUG("reset MCI\n\r");
WRITE_MCI(pMciHw, MCI_CR, AT91C_MCI_MCIDIS | AT91C_MCI_PWSDIS);
WRITE_MCI(pMciHw, MCI_MR, mciMr);
WRITE_MCI(pMciHw, MCI_SDCR, mciSdcr);
WRITE_MCI(pMciHw, MCI_DTOR, mciDtor);
}
#endif
// If no error occured, the transfer is successful
if (pCommand->status == MCI_STATUS_PENDING) {
pCommand->status = 0;
}
#if 0
if ((status & AT91C_MCI_CMDRDY) != 0)
TRACE_DEBUG_WP(".");
if ((status & AT91C_MCI_ENDRX) != 0)
TRACE_DEBUG_WP("<");
if ((status & AT91C_MCI_ENDTX) != 0)
TRACE_DEBUG_WP("-");
if ((status & AT91C_MCI_BLKE) != 0)
TRACE_DEBUG_WP(">");
TRACE_DEBUG_WP("\n\r");
#endif
// Store the card response in the provided buffer
if (pCommand->pResp) {
unsigned char resSize;
switch (pCommand->resType) {
case 1:
resSize = 1;
break;
case 2:
resSize = 4;
break;
case 3:
resSize = 1;
break;
case 4:
resSize = 1;
break;
case 5:
resSize = 1;
break;
case 6:
resSize = 1;
break;
case 7:
resSize = 1;
break;
default:
resSize = 0;
break;
}
for (i=0; i < resSize; i++) {
pCommand->pResp[i] = READ_MCI(pMciHw, MCI_RSPR[0]);
}
}
// Disable interrupts
WRITE_MCI(pMciHw, MCI_IDR, READ_MCI(pMciHw, MCI_IMR));
// Release the semaphore
pMci->semaphore++;
// Invoke the callback associated with the current command (if any)
if (pCommand->callback) {
(pCommand->callback)(pCommand->status, pCommand);
}
}
}