mmc/host/mmc_spi.c

22 #include <linux/mmc/host.h>
138 static inline int mmc_cs_off(struct mmc_spi_host *host)
141 	return spi_setup(host->spi);
144 static int mmc_spi_readbytes(struct mmc_spi_host *host, unsigned int len)
146 	if (len > sizeof(*host->data)) {
151 	host->status.len = len;
153 	return spi_sync_locked(host->spi, &host->readback);
156 static int mmc_spi_skip(struct mmc_spi_host *host, unsigned long timeout,
159 	u8 *cp = host->data->status;
166 		status = mmc_spi_readbytes(host, n);
182 mmc_spi_wait_unbusy(struct mmc_spi_host *host, unsigned long timeout)
184 	return mmc_spi_skip(host, timeout, sizeof(host->data->status), 0);
187 static int mmc_spi_readtoken(struct mmc_spi_host *host, unsigned long timeout)
189 	return mmc_spi_skip(host, timeout, 1, 0xff);
214 static int mmc_spi_response_get(struct mmc_spi_host *host,
218 	u8	*cp = host->data->status;
219 	u8	*end = cp + host->t.len;
242 		cp = host->data->status;
257 			value = mmc_spi_readbytes(host, 1);
274 			value = mmc_spi_readbytes(host, 1);
277 			cp = host->data->status;
319 			mmc_spi_wait_unbusy(host, msecs_to_jiffies(timeout_ms));
329 			value = mmc_spi_readbytes(host, 1);
332 			cp = host->data->status;
352 				value = mmc_spi_readbytes(host, 1);
355 				cp = host->data->status;
373 		dev_dbg(&host->spi->dev, "bad response type %04x\n",
381 		dev_dbg(&host->spi->dev, "%s: resp %04x %08x\n",
390 	mmc_cs_off(host);
401 mmc_spi_command_send(struct mmc_spi_host *host,
405 	struct scratch		*data = host->data;
479 	dev_dbg(&host->spi->dev, "  CMD%d, resp %s\n",
483 	spi_message_init(&host->m);
485 	t = &host->t;
490 	spi_message_add_tail(t, &host->m);
492 	status = spi_sync_locked(host->spi, &host->m);
494 		dev_dbg(&host->spi->dev, "  ... write returned %d\n", status);
500 	return mmc_spi_response_get(host, cmd, cs_on);
512 mmc_spi_setup_data_message(struct mmc_spi_host *host, bool multiple, bool write)
515 	struct scratch		*scratch = host->data;
517 	spi_message_init(&host->m);
523 		t = &host->token;
531 		spi_message_add_tail(t, &host->m);
537 	t = &host->t;
539 	t->tx_buf = host->ones;
541 	spi_message_add_tail(t, &host->m);
543 	t = &host->crc;
550 		t->tx_buf = host->ones;
553 	spi_message_add_tail(t, &host->m);
570 		t = &host->early_status;
573 		t->tx_buf = host->ones;
576 		spi_message_add_tail(t, &host->m);
593 mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t,
596 	struct spi_device	*spi = host->spi;
598 	struct scratch		*scratch = host->data;
601 	if (host->mmc->use_spi_crc)
604 	status = spi_sync_locked(spi, &host->m);
638 		/* host shall then issue MMC_STOP_TRANSMISSION */
642 		/* host shall then issue MMC_STOP_TRANSMISSION,
667 	return mmc_spi_wait_unbusy(host, timeout);
687 mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t,
690 	struct spi_device	*spi = host->spi;
692 	struct scratch		*scratch = host->data;
699 	status = mmc_spi_readbytes(host, 1);
704 		status = mmc_spi_readtoken(host, timeout);
721 	status = spi_sync_locked(spi, &host->m);
748 	if (host->mmc->use_spi_crc) {
771 mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd,
774 	struct spi_device	*spi = host->spi;
784 	mmc_spi_setup_data_message(host, multiple, write);
785 	t = &host->t;
818 				status = mmc_spi_writeblock(host, t, timeout);
820 				status = mmc_spi_readblock(host, t, timeout);
852 		struct scratch	*scratch = host->data;
863 		INIT_LIST_HEAD(&host->m.transfers);
864 		list_add(&host->early_status.transfer_list,
865 				&host->m.transfers);
870 		host->early_status.tx_buf = host->early_status.rx_buf;
871 		host->early_status.len = statlen;
873 		tmp = spi_sync_locked(spi, &host->m);
888 		tmp = mmc_spi_wait_unbusy(host, timeout);
902 	struct mmc_spi_host	*host = mmc_priv(mmc);
915 			dev_dbg(&host->spi->dev, "bogus command\n");
922 			dev_dbg(&host->spi->dev, "bogus STOP command\n");
929 			mmc_request_done(host->mmc, mrq);
936 	spi_bus_lock(host->spi->controller);
940 	status = mmc_spi_command_send(host, mrq, mrq->cmd, mrq->data != NULL);
942 		mmc_spi_data_do(host, mrq->cmd, mrq->data, mrq->data->blksz);
955 			status = mmc_spi_command_send(host, mrq, &stop, 0);
962 			status = mmc_spi_command_send(host, mrq, mrq->stop, 0);
964 			mmc_cs_off(host);
968 	spi_bus_unlock(host->spi->controller);
970 	mmc_request_done(host->mmc, mrq);
981 static void mmc_spi_initsequence(struct mmc_spi_host *host)
986 	mmc_spi_wait_unbusy(host, msecs_to_jiffies(MMC_SPI_INIT_TIMEOUT_MS));
987 	mmc_spi_readbytes(host, 10);
1008 	host->spi->mode ^= SPI_CS_HIGH;
1009 	if (spi_setup(host->spi) != 0) {
1011 		dev_warn(&host->spi->dev,
1013 		host->spi->mode ^= SPI_CS_HIGH;
1015 		mmc_spi_readbytes(host, 18);
1017 		host->spi->mode ^= SPI_CS_HIGH;
1018 		if (spi_setup(host->spi) != 0) {
1020 			dev_err(&host->spi->dev,
1038 	struct mmc_spi_host *host = mmc_priv(mmc);
1040 	if (host->power_mode != ios->power_mode) {
1043 		canpower = host->pdata && host->pdata->setpower;
1045 		dev_dbg(&host->spi->dev, "power %s (%d)%s\n",
1057 				host->pdata->setpower(&host->spi->dev,
1060 					msleep(host->powerup_msecs);
1066 			mmc_spi_initsequence(host);
1081 			host->spi->mode &= ~(SPI_CPOL|SPI_CPHA);
1082 			mres = spi_setup(host->spi);
1084 				dev_dbg(&host->spi->dev,
1087 			if (spi_write(host->spi, &nullbyte, 1) < 0)
1088 				dev_dbg(&host->spi->dev,
1102 				host->spi->mode |= (SPI_CPOL|SPI_CPHA);
1103 				mres = spi_setup(host->spi);
1105 					dev_dbg(&host->spi->dev,
1110 		host->power_mode = ios->power_mode;
1113 	if (host->spi->max_speed_hz != ios->clock && ios->clock != 0) {
1116 		host->spi->max_speed_hz = ios->clock;
1117 		status = spi_setup(host->spi);
1118 		dev_dbg(&host->spi->dev, "  clock to %d Hz, %d\n",
1119 			host->spi->max_speed_hz, status);
1140 	struct mmc_spi_host *host = mmc_priv(mmc);
1141 	u16 delay_msec = max(host->pdata->detect_delay, (u16)100);
1151 	struct mmc_spi_host	*host;
1191 	mmc = mmc_alloc_host(sizeof(*host), &spi->dev);
1214 	host = mmc_priv(mmc);
1215 	host->mmc = mmc;
1216 	host->spi = spi;
1218 	host->ones = ones;
1225 	host->pdata = mmc_spi_get_pdata(spi);
1226 	if (host->pdata)
1227 		mmc->ocr_avail = host->pdata->ocr_mask;
1232 	if (host->pdata && host->pdata->setpower) {
1233 		host->powerup_msecs = host->pdata->powerup_msecs;
1234 		if (!host->powerup_msecs || host->powerup_msecs > 250)
1235 			host->powerup_msecs = 250;
1239 	host->data = kmalloc(sizeof(*host->data), GFP_KERNEL);
1240 	if (!host->data)
1244 	spi_message_init(&host->readback);
1246 	spi_message_add_tail(&host->status, &host->readback);
1247 	host->status.tx_buf = host->ones;
1248 	host->status.rx_buf = &host->data->status;
1249 	host->status.cs_change = 1;
1252 	if (host->pdata && host->pdata->init) {
1253 		status = host->pdata->init(&spi->dev, mmc_spi_detect_irq, mmc);
1259 	if (host->pdata) {
1260 		mmc->caps |= host->pdata->caps;
1261 		mmc->caps2 |= host->pdata->caps2;
1293 	dev_info(&spi->dev, "SD/MMC host %s%s%s%s\n",
1296 			(host->pdata && host->pdata->setpower)
1305 	kfree(host->data);
1318 	struct mmc_spi_host	*host = mmc_priv(mmc);
1321 	if (host->pdata && host->pdata->exit)
1322 		host->pdata->exit(&spi->dev, mmc);
1326 	kfree(host->data);
1327 	kfree(host->ones);
1359 MODULE_DESCRIPTION("SPI SD/MMC host driver");