mmc/host/bcm2835.c

48 #include <linux/mmc/host.h>
60 #define SDHSTS 0x20 /* SD host status                  - 11 R/W */
192 static void bcm2835_dumpcmd(struct bcm2835_host *host, struct mmc_command *cmd,
195 	struct device *dev = &host->pdev->dev;
201 		(cmd == host->cmd) ? '>' : ' ',
207 static void bcm2835_dumpregs(struct bcm2835_host *host)
209 	struct mmc_request *mrq = host->mrq;
210 	struct device *dev = &host->pdev->dev;
213 		bcm2835_dumpcmd(host, mrq->sbc, "sbc");
214 		bcm2835_dumpcmd(host, mrq->cmd, "cmd");
221 		bcm2835_dumpcmd(host, mrq->stop, "stop");
225 	dev_dbg(dev, "SDCMD  0x%08x\n", readl(host->ioaddr + SDCMD));
226 	dev_dbg(dev, "SDARG  0x%08x\n", readl(host->ioaddr + SDARG));
227 	dev_dbg(dev, "SDTOUT 0x%08x\n", readl(host->ioaddr + SDTOUT));
228 	dev_dbg(dev, "SDCDIV 0x%08x\n", readl(host->ioaddr + SDCDIV));
229 	dev_dbg(dev, "SDRSP0 0x%08x\n", readl(host->ioaddr + SDRSP0));
230 	dev_dbg(dev, "SDRSP1 0x%08x\n", readl(host->ioaddr + SDRSP1));
231 	dev_dbg(dev, "SDRSP2 0x%08x\n", readl(host->ioaddr + SDRSP2));
232 	dev_dbg(dev, "SDRSP3 0x%08x\n", readl(host->ioaddr + SDRSP3));
233 	dev_dbg(dev, "SDHSTS 0x%08x\n", readl(host->ioaddr + SDHSTS));
234 	dev_dbg(dev, "SDVDD  0x%08x\n", readl(host->ioaddr + SDVDD));
235 	dev_dbg(dev, "SDEDM  0x%08x\n", readl(host->ioaddr + SDEDM));
236 	dev_dbg(dev, "SDHCFG 0x%08x\n", readl(host->ioaddr + SDHCFG));
237 	dev_dbg(dev, "SDHBCT 0x%08x\n", readl(host->ioaddr + SDHBCT));
238 	dev_dbg(dev, "SDHBLC 0x%08x\n", readl(host->ioaddr + SDHBLC));
242 static void bcm2835_reset_internal(struct bcm2835_host *host)
246 	writel(SDVDD_POWER_OFF, host->ioaddr + SDVDD);
247 	writel(0, host->ioaddr + SDCMD);
248 	writel(0, host->ioaddr + SDARG);
249 	writel(0xf00000, host->ioaddr + SDTOUT);
250 	writel(0, host->ioaddr + SDCDIV);
251 	writel(0x7f8, host->ioaddr + SDHSTS); /* Write 1s to clear */
252 	writel(0, host->ioaddr + SDHCFG);
253 	writel(0, host->ioaddr + SDHBCT);
254 	writel(0, host->ioaddr + SDHBLC);
257 	temp = readl(host->ioaddr + SDEDM);
262 	writel(temp, host->ioaddr + SDEDM);
264 	writel(SDVDD_POWER_ON, host->ioaddr + SDVDD);
266 	host->clock = 0;
267 	writel(host->hcfg, host->ioaddr + SDHCFG);
268 	writel(host->cdiv, host->ioaddr + SDCDIV);
273 	struct bcm2835_host *host = mmc_priv(mmc);
275 	if (host->dma_chan)
276 		dmaengine_terminate_sync(host->dma_chan);
277 	host->dma_chan = NULL;
278 	bcm2835_reset_internal(host);
281 static void bcm2835_finish_command(struct bcm2835_host *host);
283 static void bcm2835_wait_transfer_complete(struct bcm2835_host *host)
288 	alternate_idle = (host->mrq->data->flags & MMC_DATA_READ) ?
296 		edm = readl(host->ioaddr + SDEDM);
304 			       host->ioaddr + SDEDM);
310 			dev_err(&host->pdev->dev,
313 			bcm2835_dumpregs(host);
314 			host->mrq->data->error = -ETIMEDOUT;
323 	struct bcm2835_host *host = param;
325 	schedule_work(&host->dma_work);
328 static void bcm2835_transfer_block_pio(struct bcm2835_host *host, bool is_read)
333 	blksize = host->data->blksz;
343 		if (!sg_miter_next(&host->sg_miter)) {
344 			host->data->error = -EINVAL;
348 		len = min(host->sg_miter.length, blksize);
350 			host->data->error = -EINVAL;
355 		host->sg_miter.consumed = len;
357 		buf = (u32 *)host->sg_miter.addr;
366 			edm = readl(host->ioaddr + SDEDM);
374 				struct device *dev = &host->pdev->dev;
384 					hsts = readl(host->ioaddr + SDHSTS);
399 				       host->ns_per_fifo_word);
409 					*(buf++) = readl(host->ioaddr + SDDATA);
411 					writel(*(buf++), host->ioaddr + SDDATA);
420 	sg_miter_stop(&host->sg_miter);
423 static void bcm2835_transfer_pio(struct bcm2835_host *host)
425 	struct device *dev = &host->pdev->dev;
429 	is_read = (host->data->flags & MMC_DATA_READ) != 0;
430 	bcm2835_transfer_block_pio(host, is_read);
432 	sdhsts = readl(host->ioaddr + SDHSTS);
438 		host->data->error = -EILSEQ;
443 		host->data->error = -ETIMEDOUT;
448 void bcm2835_prepare_dma(struct bcm2835_host *host, struct mmc_data *data)
454 	dma_chan = host->dma_chan_rxtx;
470 	host->drain_words = 0;
483 				host->drain_page = sg_page(sg);
484 				host->drain_offset = sg->offset + sg->length;
487 		host->drain_words = len / 4;
493 				     &host->dma_cfg_rx :
494 				     &host->dma_cfg_tx);
510 	desc->callback_param = host;
511 	host->dma_desc = desc;
512 	host->dma_chan = dma_chan;
513 	host->dma_dir = dir_data;
516 static void bcm2835_start_dma(struct bcm2835_host *host)
518 	dmaengine_submit(host->dma_desc);
519 	dma_async_issue_pending(host->dma_chan);
522 static void bcm2835_set_transfer_irqs(struct bcm2835_host *host)
527 	if (host->dma_desc) {
528 		host->hcfg = (host->hcfg & ~all_irqs) |
531 		host->hcfg = (host->hcfg & ~all_irqs) |
536 	writel(host->hcfg, host->ioaddr + SDHCFG);
540 void bcm2835_prepare_data(struct bcm2835_host *host, struct mmc_command *cmd)
544 	WARN_ON(host->data);
546 	host->data = data;
550 	host->data_complete = false;
551 	host->data->bytes_xfered = 0;
553 	if (!host->dma_desc) {
561 		sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
562 		host->blocks = data->blocks;
565 	bcm2835_set_transfer_irqs(host);
567 	writel(data->blksz, host->ioaddr + SDHBCT);
568 	writel(data->blocks, host->ioaddr + SDHBLC);
571 static u32 bcm2835_read_wait_sdcmd(struct bcm2835_host *host, u32 max_ms)
573 	struct device *dev = &host->pdev->dev;
577 	ret = readl_poll_timeout(host->ioaddr + SDCMD, value,
581 		ret = readl_poll_timeout(host->ioaddr + SDCMD, value,
590 static void bcm2835_finish_request(struct bcm2835_host *host)
595 	cancel_delayed_work(&host->timeout_work);
597 	mrq = host->mrq;
599 	host->mrq = NULL;
600 	host->cmd = NULL;
601 	host->data = NULL;
603 	host->dma_desc = NULL;
604 	terminate_chan = host->dma_chan;
605 	host->dma_chan = NULL;
611 			dev_err(&host->pdev->dev,
615 	mmc_request_done(mmc_from_priv(host), mrq);
619 bool bcm2835_send_command(struct bcm2835_host *host, struct mmc_command *cmd)
621 	struct device *dev = &host->pdev->dev;
625 	WARN_ON(host->cmd);
627 	sdcmd = bcm2835_read_wait_sdcmd(host, 100);
630 		bcm2835_dumpregs(host);
632 		bcm2835_finish_request(host);
640 	schedule_delayed_work(&host->timeout_work, timeout);
642 	host->cmd = cmd;
645 	sdhsts = readl(host->ioaddr + SDHSTS);
647 		writel(sdhsts, host->ioaddr + SDHSTS);
652 		bcm2835_finish_request(host);
656 	bcm2835_prepare_data(host, cmd);
658 	writel(cmd->arg, host->ioaddr + SDARG);
662 	host->use_busy = false;
670 			host->use_busy = true;
681 	writel(sdcmd | SDCMD_NEW_FLAG, host->ioaddr + SDCMD);
686 static void bcm2835_transfer_complete(struct bcm2835_host *host)
690 	WARN_ON(!host->data_complete);
692 	data = host->data;
693 	host->data = NULL;
699 	if (host->mrq->stop && (data->error || !host->use_sbc)) {
700 		if (bcm2835_send_command(host, host->mrq->stop)) {
702 			if (!host->use_busy)
703 				bcm2835_finish_command(host);
706 		bcm2835_wait_transfer_complete(host);
707 		bcm2835_finish_request(host);
711 static void bcm2835_finish_data(struct bcm2835_host *host)
713 	struct device *dev = &host->pdev->dev;
716 	data = host->data;
718 	host->hcfg &= ~(SDHCFG_DATA_IRPT_EN | SDHCFG_BLOCK_IRPT_EN);
719 	writel(host->hcfg, host->ioaddr + SDHCFG);
723 	host->data_complete = true;
725 	if (host->cmd) {
731 			readl(host->ioaddr + SDHSTS));
733 		bcm2835_transfer_complete(host);
737 static void bcm2835_finish_command(struct bcm2835_host *host)
739 	struct device *dev = &host->pdev->dev;
740 	struct mmc_command *cmd = host->cmd;
743 	sdcmd = bcm2835_read_wait_sdcmd(host, 100);
748 		bcm2835_dumpregs(host);
749 		host->cmd->error = -EIO;
750 		bcm2835_finish_request(host);
753 		u32 sdhsts = readl(host->ioaddr + SDHSTS);
756 		writel(SDHSTS_ERROR_MASK, host->ioaddr + SDHSTS);
759 		    (host->cmd->opcode != MMC_SEND_OP_COND)) {
763 				host->cmd->error = -ETIMEDOUT;
766 					host->cmd->opcode);
767 				bcm2835_dumpregs(host);
768 				host->cmd->error = -EILSEQ;
770 			edm = readl(host->ioaddr + SDEDM);
776 				       host->ioaddr + SDEDM);
777 			bcm2835_finish_request(host);
788 					readl(host->ioaddr + SDRSP0 + i * 4);
791 			cmd->resp[0] = readl(host->ioaddr + SDRSP0);
795 	if (cmd == host->mrq->sbc) {
797 		host->cmd = NULL;
798 		if (bcm2835_send_command(host, host->mrq->cmd)) {
799 			if (host->data && host->dma_desc)
803 				bcm2835_start_dma(host);
805 			if (!host->use_busy)
806 				bcm2835_finish_command(host);
808 	} else if (cmd == host->mrq->stop) {
810 		bcm2835_finish_request(host);
813 		host->cmd = NULL;
814 		if (!host->data)
815 			bcm2835_finish_request(host);
816 		else if (host->data_complete)
817 			bcm2835_transfer_complete(host);
824 	struct bcm2835_host *host =
826 	struct device *dev = &host->pdev->dev;
828 	mutex_lock(&host->mutex);
830 	if (host->mrq) {
832 		bcm2835_dumpregs(host);
834 		bcm2835_reset(mmc_from_priv(host));
836 		if (host->data) {
837 			host->data->error = -ETIMEDOUT;
838 			bcm2835_finish_data(host);
840 			if (host->cmd)
841 				host->cmd->error = -ETIMEDOUT;
843 				host->mrq->cmd->error = -ETIMEDOUT;
845 			bcm2835_finish_request(host);
849 	mutex_unlock(&host->mutex);
852 static bool bcm2835_check_cmd_error(struct bcm2835_host *host, u32 intmask)
854 	struct device *dev = &host->pdev->dev;
859 	if (!host->cmd)
864 		host->cmd->error = -EILSEQ;
867 		if (host->mrq->data)
868 			host->mrq->data->error = -EILSEQ;
870 			host->cmd->error = -EILSEQ;
872 		if (host->mrq->data)
873 			host->mrq->data->error = -ETIMEDOUT;
875 			host->cmd->error = -ETIMEDOUT;
877 		host->cmd->error = -ETIMEDOUT;
879 	bcm2835_dumpregs(host);
883 static void bcm2835_check_data_error(struct bcm2835_host *host, u32 intmask)
885 	if (!host->data)
888 		host->data->error = -EILSEQ;
890 		host->data->error = -ETIMEDOUT;
893 static void bcm2835_busy_irq(struct bcm2835_host *host)
895 	if (WARN_ON(!host->cmd)) {
896 		bcm2835_dumpregs(host);
900 	if (WARN_ON(!host->use_busy)) {
901 		bcm2835_dumpregs(host);
904 	host->use_busy = false;
906 	bcm2835_finish_command(host);
909 static void bcm2835_data_irq(struct bcm2835_host *host, u32 intmask)
917 	if (!host->data)
920 	bcm2835_check_data_error(host, intmask);
921 	if (host->data->error)
924 	if (host->data->flags & MMC_DATA_WRITE) {
926 		host->hcfg &= ~(SDHCFG_DATA_IRPT_EN);
927 		host->hcfg |= SDHCFG_BLOCK_IRPT_EN;
928 		writel(host->hcfg, host->ioaddr + SDHCFG);
929 		bcm2835_transfer_pio(host);
931 		bcm2835_transfer_pio(host);
932 		host->blocks--;
933 		if ((host->blocks == 0) || host->data->error)
939 	host->hcfg &= ~(SDHCFG_DATA_IRPT_EN | SDHCFG_BLOCK_IRPT_EN);
940 	writel(host->hcfg, host->ioaddr + SDHCFG);
943 static void bcm2835_data_threaded_irq(struct bcm2835_host *host)
945 	if (!host->data)
947 	if ((host->blocks == 0) || host->data->error)
948 		bcm2835_finish_data(host);
951 static void bcm2835_block_irq(struct bcm2835_host *host)
953 	if (WARN_ON(!host->data)) {
954 		bcm2835_dumpregs(host);
958 	if (!host->dma_desc) {
959 		WARN_ON(!host->blocks);
960 		if (host->data->error || (--host->blocks == 0))
961 			bcm2835_finish_data(host);
963 			bcm2835_transfer_pio(host);
964 	} else if (host->data->flags & MMC_DATA_WRITE) {
965 		bcm2835_finish_data(host);
972 	struct bcm2835_host *host = dev_id;
975 	spin_lock(&host->lock);
977 	intmask = readl(host->ioaddr + SDHSTS);
983 	       host->ioaddr + SDHSTS);
986 		bcm2835_check_data_error(host, intmask);
987 		host->irq_block = true;
992 		if (!bcm2835_check_cmd_error(host, intmask)) {
993 			host->irq_busy = true;
1005 	    (host->hcfg & SDHCFG_DATA_IRPT_EN)) {
1006 		bcm2835_data_irq(host, intmask);
1007 		host->irq_data = true;
1011 	spin_unlock(&host->lock);
1018 	struct bcm2835_host *host = dev_id;
1022 	spin_lock_irqsave(&host->lock, flags);
1024 	block = host->irq_block;
1025 	busy  = host->irq_busy;
1026 	data  = host->irq_data;
1027 	host->irq_block = false;
1028 	host->irq_busy  = false;
1029 	host->irq_data  = false;
1031 	spin_unlock_irqrestore(&host->lock, flags);
1033 	mutex_lock(&host->mutex);
1036 		bcm2835_block_irq(host);
1038 		bcm2835_busy_irq(host);
1040 		bcm2835_data_threaded_irq(host);
1042 	mutex_unlock(&host->mutex);
1049 	struct bcm2835_host *host =
1053 	mutex_lock(&host->mutex);
1055 	data = host->data;
1057 	if (host->dma_chan) {
1058 		dma_unmap_sg(host->dma_chan->device->dev,
1060 			     host->dma_dir);
1062 		host->dma_chan = NULL;
1065 	if (host->drain_words) {
1069 		if (host->drain_offset & PAGE_MASK) {
1070 			host->drain_page += host->drain_offset >> PAGE_SHIFT;
1071 			host->drain_offset &= ~PAGE_MASK;
1073 		page = kmap_local_page(host->drain_page);
1074 		buf = page + host->drain_offset;
1076 		while (host->drain_words) {
1077 			u32 edm = readl(host->ioaddr + SDEDM);
1080 				*(buf++) = readl(host->ioaddr + SDDATA);
1081 			host->drain_words--;
1087 	bcm2835_finish_data(host);
1089 	mutex_unlock(&host->mutex);
1092 static void bcm2835_set_clock(struct bcm2835_host *host, unsigned int clock)
1094 	struct mmc_host *mmc = mmc_from_priv(host);
1122 		host->cdiv = SDCDIV_MAX_CDIV;
1123 		writel(host->cdiv, host->ioaddr + SDCDIV);
1127 	div = host->max_clk / clock;
1130 	if ((host->max_clk / div) > clock)
1137 	clock = host->max_clk / (div + 2);
1142 	host->ns_per_fifo_word = (1000000000 / clock) *
1145 	host->cdiv = div;
1146 	writel(host->cdiv, host->ioaddr + SDCDIV);
1149 	writel(mmc->actual_clock / 2, host->ioaddr + SDTOUT);
1154 	struct bcm2835_host *host = mmc_priv(mmc);
1155 	struct device *dev = &host->pdev->dev;
1179 	mutex_lock(&host->mutex);
1181 	WARN_ON(host->mrq);
1182 	host->mrq = mrq;
1184 	edm = readl(host->ioaddr + SDEDM);
1190 			readl(host->ioaddr + SDCMD) & SDCMD_CMD_MASK,
1192 		bcm2835_dumpregs(host);
1197 		bcm2835_finish_request(host);
1198 		mutex_unlock(&host->mutex);
1202 	if (host->use_dma && mrq->data && (mrq->data->blocks > PIO_THRESHOLD))
1203 		bcm2835_prepare_dma(host, mrq->data);
1205 	host->use_sbc = !!mrq->sbc && host->mrq->data &&
1206 			(host->mrq->data->flags & MMC_DATA_READ);
1207 	if (host->use_sbc) {
1208 		if (bcm2835_send_command(host, mrq->sbc)) {
1209 			if (!host->use_busy)
1210 				bcm2835_finish_command(host);
1212 	} else if (mrq->cmd && bcm2835_send_command(host, mrq->cmd)) {
1213 		if (host->data && host->dma_desc) {
1215 			bcm2835_start_dma(host);
1218 		if (!host->use_busy)
1219 			bcm2835_finish_command(host);
1222 	mutex_unlock(&host->mutex);
1227 	struct bcm2835_host *host = mmc_priv(mmc);
1229 	mutex_lock(&host->mutex);
1231 	if (!ios->clock || ios->clock != host->clock) {
1232 		bcm2835_set_clock(host, ios->clock);
1233 		host->clock = ios->clock;
1237 	host->hcfg &= ~SDHCFG_WIDE_EXT_BUS;
1239 		host->hcfg |= SDHCFG_WIDE_EXT_BUS;
1241 	host->hcfg |= SDHCFG_WIDE_INT_BUS;
1244 	host->hcfg |= SDHCFG_SLOW_CARD;
1246 	writel(host->hcfg, host->ioaddr + SDHCFG);
1248 	mutex_unlock(&host->mutex);
1257 static int bcm2835_add_host(struct bcm2835_host *host)
1259 	struct mmc_host *mmc = mmc_from_priv(host);
1260 	struct device *dev = &host->pdev->dev;
1264 	if (!mmc->f_max || mmc->f_max > host->max_clk)
1265 		mmc->f_max = host->max_clk;
1266 	mmc->f_min = host->max_clk / SDCDIV_MAX_CDIV;
1273 	/* host controller capabilities */
1277 	spin_lock_init(&host->lock);
1278 	mutex_init(&host->mutex);
1280 	if (!host->dma_chan_rxtx) {
1282 		host->use_dma = false;
1284 		host->use_dma = true;
1286 		host->dma_cfg_tx.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1287 		host->dma_cfg_tx.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1288 		host->dma_cfg_tx.direction = DMA_MEM_TO_DEV;
1289 		host->dma_cfg_tx.src_addr = 0;
1290 		host->dma_cfg_tx.dst_addr = host->phys_addr + SDDATA;
1292 		host->dma_cfg_rx.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1293 		host->dma_cfg_rx.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1294 		host->dma_cfg_rx.direction = DMA_DEV_TO_MEM;
1295 		host->dma_cfg_rx.src_addr = host->phys_addr + SDDATA;
1296 		host->dma_cfg_rx.dst_addr = 0;
1298 		if (dmaengine_slave_config(host->dma_chan_rxtx,
1299 					   &host->dma_cfg_tx) != 0 ||
1300 		    dmaengine_slave_config(host->dma_chan_rxtx,
1301 					   &host->dma_cfg_rx) != 0)
1302 			host->use_dma = false;
1314 	INIT_WORK(&host->dma_work, bcm2835_dma_complete_work);
1315 	INIT_DELAYED_WORK(&host->timeout_work, bcm2835_timeout);
1318 	host->hcfg = SDHCFG_BUSY_IRPT_EN;
1320 	bcm2835_reset_internal(host);
1322 	ret = request_threaded_irq(host->irq, bcm2835_irq,
1324 				   0, mmc_hostname(mmc), host);
1326 		dev_err(dev, "failed to request IRQ %d: %d\n", host->irq, ret);
1332 		free_irq(host->irq, host);
1337 	if (host->use_dma && (PIO_THRESHOLD > 0))
1340 		 host->use_dma ? "enabled" : "disabled", pio_limit_string);
1349 	struct bcm2835_host *host;
1355 	mmc = mmc_alloc_host(sizeof(*host), dev);
1360 	host = mmc_priv(mmc);
1361 	host->pdev = pdev;
1362 	spin_lock_init(&host->lock);
1364 	host->ioaddr = devm_platform_ioremap_resource(pdev, 0);
1365 	if (IS_ERR(host->ioaddr)) {
1366 		ret = PTR_ERR(host->ioaddr);
1380 	host->phys_addr = be32_to_cpup(regaddr_p);
1382 	host->dma_chan = NULL;
1383 	host->dma_desc = NULL;
1385 	host->dma_chan_rxtx = dma_request_chan(dev, "rx-tx");
1386 	if (IS_ERR(host->dma_chan_rxtx)) {
1387 		ret = PTR_ERR(host->dma_chan_rxtx);
1388 		host->dma_chan_rxtx = NULL;
1403 	host->max_clk = clk_get_rate(clk);
1405 	host->irq = platform_get_irq(pdev, 0);
1406 	if (host->irq < 0) {
1407 		ret = host->irq;
1415 	ret = bcm2835_add_host(host);
1419 	platform_set_drvdata(pdev, host);
1427 	if (host->dma_chan_rxtx)
1428 		dma_release_channel(host->dma_chan_rxtx);
1436 	struct bcm2835_host *host = platform_get_drvdata(pdev);
1437 	struct mmc_host *mmc = mmc_from_priv(host);
1441 	writel(SDVDD_POWER_OFF, host->ioaddr + SDVDD);
1443 	free_irq(host->irq, host);
1445 	cancel_work_sync(&host->dma_work);
1446 	cancel_delayed_work_sync(&host->timeout_work);
1448 	if (host->dma_chan_rxtx)
1449 		dma_release_channel(host->dma_chan_rxtx);