Lines Matching +full:bcm2835 +full:- +full:sdhost
1 // SPDX-License-Identifier: GPL-2.0
3 * bcm2835 sdhost driver.
6 * (supported by the iproc driver) and a custom sdhost controller
9 * The sdhci controller supports both sdcard and sdio. The sdhost
12 * the sdhost controller allows to use the sdhci controller for wifi
21 * Copyright (C) 2015-2016 Raspberry Pi (Trading) Ltd.
24 * mmc-bcm2835.c by Gellert Weisz
26 * sdhci-bcm2708.c by Broadcom
27 * sdhci-bcm2835.c by Stephen Warren and Oleksandr Tymoshenko
28 * sdhci.c and sdhci-pci.c by Pierre Ossman
34 #include <linux/dma-mapping.h>
52 #define SDCMD 0x00 /* Command to SD card - 16 R/W */
53 #define SDARG 0x04 /* Argument to SD card - 32 R/W */
54 #define SDTOUT 0x08 /* Start value for timeout counter - 32 R/W */
55 #define SDCDIV 0x0c /* Start value for clock divider - 11 R/W */
56 #define SDRSP0 0x10 /* SD card response (31:0) - 32 R */
57 #define SDRSP1 0x14 /* SD card response (63:32) - 32 R */
58 #define SDRSP2 0x18 /* SD card response (95:64) - 32 R */
59 #define SDRSP3 0x1c /* SD card response (127:96) - 32 R */
60 #define SDHSTS 0x20 /* SD host status - 11 R/W */
61 #define SDVDD 0x30 /* SD card power control - 1 R/W */
62 #define SDEDM 0x34 /* Emergency Debug Mode - 13 R/W */
63 #define SDHCFG 0x38 /* Host configuration - 2 R/W */
64 #define SDHBCT 0x3c /* Host byte count (debug) - 32 R/W */
65 #define SDDATA 0x40 /* Data to/from SD card - 32 R/W */
66 #define SDHBLC 0x50 /* Host block count (SDIO/SDHC) - 9 R/W */
195 struct device *dev = &host->pdev->dev; in bcm2835_dumpcmd()
200 dev_dbg(dev, "%c%s op %d arg 0x%x flags 0x%x - resp %08x %08x %08x %08x, err %d\n", in bcm2835_dumpcmd()
201 (cmd == host->cmd) ? '>' : ' ', in bcm2835_dumpcmd()
202 label, cmd->opcode, cmd->arg, cmd->flags, in bcm2835_dumpcmd()
203 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3], in bcm2835_dumpcmd()
204 cmd->error); in bcm2835_dumpcmd()
209 struct mmc_request *mrq = host->mrq; in bcm2835_dumpregs()
210 struct device *dev = &host->pdev->dev; in bcm2835_dumpregs()
213 bcm2835_dumpcmd(host, mrq->sbc, "sbc"); in bcm2835_dumpregs()
214 bcm2835_dumpcmd(host, mrq->cmd, "cmd"); in bcm2835_dumpregs()
215 if (mrq->data) { in bcm2835_dumpregs()
216 dev_dbg(dev, "data blocks %x blksz %x - err %d\n", in bcm2835_dumpregs()
217 mrq->data->blocks, in bcm2835_dumpregs()
218 mrq->data->blksz, in bcm2835_dumpregs()
219 mrq->data->error); in bcm2835_dumpregs()
221 bcm2835_dumpcmd(host, mrq->stop, "stop"); in bcm2835_dumpregs()
225 dev_dbg(dev, "SDCMD 0x%08x\n", readl(host->ioaddr + SDCMD)); in bcm2835_dumpregs()
226 dev_dbg(dev, "SDARG 0x%08x\n", readl(host->ioaddr + SDARG)); in bcm2835_dumpregs()
227 dev_dbg(dev, "SDTOUT 0x%08x\n", readl(host->ioaddr + SDTOUT)); in bcm2835_dumpregs()
228 dev_dbg(dev, "SDCDIV 0x%08x\n", readl(host->ioaddr + SDCDIV)); in bcm2835_dumpregs()
229 dev_dbg(dev, "SDRSP0 0x%08x\n", readl(host->ioaddr + SDRSP0)); in bcm2835_dumpregs()
230 dev_dbg(dev, "SDRSP1 0x%08x\n", readl(host->ioaddr + SDRSP1)); in bcm2835_dumpregs()
231 dev_dbg(dev, "SDRSP2 0x%08x\n", readl(host->ioaddr + SDRSP2)); in bcm2835_dumpregs()
232 dev_dbg(dev, "SDRSP3 0x%08x\n", readl(host->ioaddr + SDRSP3)); in bcm2835_dumpregs()
233 dev_dbg(dev, "SDHSTS 0x%08x\n", readl(host->ioaddr + SDHSTS)); in bcm2835_dumpregs()
234 dev_dbg(dev, "SDVDD 0x%08x\n", readl(host->ioaddr + SDVDD)); in bcm2835_dumpregs()
235 dev_dbg(dev, "SDEDM 0x%08x\n", readl(host->ioaddr + SDEDM)); in bcm2835_dumpregs()
236 dev_dbg(dev, "SDHCFG 0x%08x\n", readl(host->ioaddr + SDHCFG)); in bcm2835_dumpregs()
237 dev_dbg(dev, "SDHBCT 0x%08x\n", readl(host->ioaddr + SDHBCT)); in bcm2835_dumpregs()
238 dev_dbg(dev, "SDHBLC 0x%08x\n", readl(host->ioaddr + SDHBLC)); in bcm2835_dumpregs()
246 writel(SDVDD_POWER_OFF, host->ioaddr + SDVDD); in bcm2835_reset_internal()
247 writel(0, host->ioaddr + SDCMD); in bcm2835_reset_internal()
248 writel(0, host->ioaddr + SDARG); in bcm2835_reset_internal()
249 writel(0xf00000, host->ioaddr + SDTOUT); in bcm2835_reset_internal()
250 writel(0, host->ioaddr + SDCDIV); in bcm2835_reset_internal()
251 writel(0x7f8, host->ioaddr + SDHSTS); /* Write 1s to clear */ in bcm2835_reset_internal()
252 writel(0, host->ioaddr + SDHCFG); in bcm2835_reset_internal()
253 writel(0, host->ioaddr + SDHBCT); in bcm2835_reset_internal()
254 writel(0, host->ioaddr + SDHBLC); in bcm2835_reset_internal()
257 temp = readl(host->ioaddr + SDEDM); in bcm2835_reset_internal()
262 writel(temp, host->ioaddr + SDEDM); in bcm2835_reset_internal()
264 writel(SDVDD_POWER_ON, host->ioaddr + SDVDD); in bcm2835_reset_internal()
266 host->clock = 0; in bcm2835_reset_internal()
267 writel(host->hcfg, host->ioaddr + SDHCFG); in bcm2835_reset_internal()
268 writel(host->cdiv, host->ioaddr + SDCDIV); in bcm2835_reset_internal()
275 if (host->dma_chan) in bcm2835_reset()
276 dmaengine_terminate_sync(host->dma_chan); in bcm2835_reset()
277 host->dma_chan = NULL; in bcm2835_reset()
288 alternate_idle = (host->mrq->data->flags & MMC_DATA_READ) ? in bcm2835_wait_transfer_complete()
296 edm = readl(host->ioaddr + SDEDM); in bcm2835_wait_transfer_complete()
304 host->ioaddr + SDEDM); in bcm2835_wait_transfer_complete()
310 dev_err(&host->pdev->dev, in bcm2835_wait_transfer_complete()
311 "wait_transfer_complete - still waiting after %d retries\n", in bcm2835_wait_transfer_complete()
314 host->mrq->data->error = -ETIMEDOUT; in bcm2835_wait_transfer_complete()
325 schedule_work(&host->dma_work); in bcm2835_dma_complete()
334 blksize = host->data->blksz; in bcm2835_transfer_block_pio()
346 if (!sg_miter_next(&host->sg_miter)) { in bcm2835_transfer_block_pio()
347 host->data->error = -EINVAL; in bcm2835_transfer_block_pio()
351 len = min(host->sg_miter.length, blksize); in bcm2835_transfer_block_pio()
353 host->data->error = -EINVAL; in bcm2835_transfer_block_pio()
357 blksize -= len; in bcm2835_transfer_block_pio()
358 host->sg_miter.consumed = len; in bcm2835_transfer_block_pio()
360 buf = (u32 *)host->sg_miter.addr; in bcm2835_transfer_block_pio()
369 edm = readl(host->ioaddr + SDEDM); in bcm2835_transfer_block_pio()
373 words = SDDATA_FIFO_WORDS - ((edm >> 4) & 0x1f); in bcm2835_transfer_block_pio()
377 struct device *dev = &host->pdev->dev; in bcm2835_transfer_block_pio()
387 hsts = readl(host->ioaddr + SDHSTS); in bcm2835_transfer_block_pio()
395 dev_err(dev, "PIO %s timeout - EDM %08x\n", in bcm2835_transfer_block_pio()
401 ndelay((burst_words - words) * in bcm2835_transfer_block_pio()
402 host->ns_per_fifo_word); in bcm2835_transfer_block_pio()
408 copy_words -= words; in bcm2835_transfer_block_pio()
412 *(buf++) = readl(host->ioaddr + SDDATA); in bcm2835_transfer_block_pio()
414 writel(*(buf++), host->ioaddr + SDDATA); in bcm2835_transfer_block_pio()
415 words--; in bcm2835_transfer_block_pio()
423 sg_miter_stop(&host->sg_miter); in bcm2835_transfer_block_pio()
430 struct device *dev = &host->pdev->dev; in bcm2835_transfer_pio()
434 is_read = (host->data->flags & MMC_DATA_READ) != 0; in bcm2835_transfer_pio()
437 sdhsts = readl(host->ioaddr + SDHSTS); in bcm2835_transfer_pio()
441 dev_err(dev, "%s transfer error - HSTS %08x\n", in bcm2835_transfer_pio()
443 host->data->error = -EILSEQ; in bcm2835_transfer_pio()
446 dev_err(dev, "%s timeout error - HSTS %08x\n", in bcm2835_transfer_pio()
448 host->data->error = -ETIMEDOUT; in bcm2835_transfer_pio()
459 dma_chan = host->dma_chan_rxtx; in bcm2835_prepare_dma()
460 if (data->flags & MMC_DATA_READ) { in bcm2835_prepare_dma()
469 * multi-block transfers, so don't attempt to DMA the final in bcm2835_prepare_dma()
475 host->drain_words = 0; in bcm2835_prepare_dma()
476 if ((data->blocks > 1) && (dir_data == DMA_FROM_DEVICE)) { in bcm2835_prepare_dma()
481 len = min((u32)(FIFO_READ_THRESHOLD - 1) * 4, in bcm2835_prepare_dma()
482 (u32)data->blocks * data->blksz); in bcm2835_prepare_dma()
484 for_each_sg(data->sg, sg, data->sg_len, i) { in bcm2835_prepare_dma()
486 WARN_ON(sg->length < len); in bcm2835_prepare_dma()
487 sg->length -= len; in bcm2835_prepare_dma()
488 host->drain_page = sg_page(sg); in bcm2835_prepare_dma()
489 host->drain_offset = sg->offset + sg->length; in bcm2835_prepare_dma()
492 host->drain_words = len / 4; in bcm2835_prepare_dma()
498 &host->dma_cfg_rx : in bcm2835_prepare_dma()
499 &host->dma_cfg_tx); in bcm2835_prepare_dma()
501 sg_len = dma_map_sg(dma_chan->device->dev, data->sg, data->sg_len, in bcm2835_prepare_dma()
506 desc = dmaengine_prep_slave_sg(dma_chan, data->sg, sg_len, dir_slave, in bcm2835_prepare_dma()
510 dma_unmap_sg(dma_chan->device->dev, data->sg, sg_len, dir_data); in bcm2835_prepare_dma()
514 desc->callback = bcm2835_dma_complete; in bcm2835_prepare_dma()
515 desc->callback_param = host; in bcm2835_prepare_dma()
516 host->dma_desc = desc; in bcm2835_prepare_dma()
517 host->dma_chan = dma_chan; in bcm2835_prepare_dma()
518 host->dma_dir = dir_data; in bcm2835_prepare_dma()
523 dmaengine_submit(host->dma_desc); in bcm2835_start_dma()
524 dma_async_issue_pending(host->dma_chan); in bcm2835_start_dma()
532 if (host->dma_desc) { in bcm2835_set_transfer_irqs()
533 host->hcfg = (host->hcfg & ~all_irqs) | in bcm2835_set_transfer_irqs()
536 host->hcfg = (host->hcfg & ~all_irqs) | in bcm2835_set_transfer_irqs()
541 writel(host->hcfg, host->ioaddr + SDHCFG); in bcm2835_set_transfer_irqs()
547 struct mmc_data *data = cmd->data; in bcm2835_prepare_data()
549 WARN_ON(host->data); in bcm2835_prepare_data()
551 host->data = data; in bcm2835_prepare_data()
555 host->data_complete = false; in bcm2835_prepare_data()
556 host->data->bytes_xfered = 0; in bcm2835_prepare_data()
558 if (!host->dma_desc) { in bcm2835_prepare_data()
562 if (data->flags & MMC_DATA_READ) in bcm2835_prepare_data()
566 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); in bcm2835_prepare_data()
567 host->blocks = data->blocks; in bcm2835_prepare_data()
572 writel(data->blksz, host->ioaddr + SDHBCT); in bcm2835_prepare_data()
573 writel(data->blocks, host->ioaddr + SDHBLC); in bcm2835_prepare_data()
578 struct device *dev = &host->pdev->dev; in bcm2835_read_wait_sdcmd()
582 ret = readl_poll_timeout(host->ioaddr + SDCMD, value, in bcm2835_read_wait_sdcmd()
584 if (ret == -ETIMEDOUT) in bcm2835_read_wait_sdcmd()
586 ret = readl_poll_timeout(host->ioaddr + SDCMD, value, in bcm2835_read_wait_sdcmd()
589 if (ret == -ETIMEDOUT) in bcm2835_read_wait_sdcmd()
600 cancel_delayed_work(&host->timeout_work); in bcm2835_finish_request()
602 mrq = host->mrq; in bcm2835_finish_request()
604 host->mrq = NULL; in bcm2835_finish_request()
605 host->cmd = NULL; in bcm2835_finish_request()
606 host->data = NULL; in bcm2835_finish_request()
608 host->dma_desc = NULL; in bcm2835_finish_request()
609 terminate_chan = host->dma_chan; in bcm2835_finish_request()
610 host->dma_chan = NULL; in bcm2835_finish_request()
616 dev_err(&host->pdev->dev, in bcm2835_finish_request()
626 struct device *dev = &host->pdev->dev; in bcm2835_send_command()
630 WARN_ON(host->cmd); in bcm2835_send_command()
636 cmd->error = -EILSEQ; in bcm2835_send_command()
641 if (!cmd->data && cmd->busy_timeout > 9000) in bcm2835_send_command()
642 timeout = DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ; in bcm2835_send_command()
645 schedule_delayed_work(&host->timeout_work, timeout); in bcm2835_send_command()
647 host->cmd = cmd; in bcm2835_send_command()
650 sdhsts = readl(host->ioaddr + SDHSTS); in bcm2835_send_command()
652 writel(sdhsts, host->ioaddr + SDHSTS); in bcm2835_send_command()
654 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) { in bcm2835_send_command()
656 cmd->error = -EINVAL; in bcm2835_send_command()
663 writel(cmd->arg, host->ioaddr + SDARG); in bcm2835_send_command()
665 sdcmd = cmd->opcode & SDCMD_CMD_MASK; in bcm2835_send_command()
667 host->use_busy = false; in bcm2835_send_command()
668 if (!(cmd->flags & MMC_RSP_PRESENT)) { in bcm2835_send_command()
671 if (cmd->flags & MMC_RSP_136) in bcm2835_send_command()
673 if (cmd->flags & MMC_RSP_BUSY) { in bcm2835_send_command()
675 host->use_busy = true; in bcm2835_send_command()
679 if (cmd->data) { in bcm2835_send_command()
680 if (cmd->data->flags & MMC_DATA_WRITE) in bcm2835_send_command()
682 if (cmd->data->flags & MMC_DATA_READ) in bcm2835_send_command()
686 writel(sdcmd | SDCMD_NEW_FLAG, host->ioaddr + SDCMD); in bcm2835_send_command()
695 WARN_ON(!host->data_complete); in bcm2835_transfer_complete()
697 data = host->data; in bcm2835_transfer_complete()
698 host->data = NULL; in bcm2835_transfer_complete()
700 /* Need to send CMD12 if - in bcm2835_transfer_complete()
701 * a) open-ended multiblock transfer (no CMD23) in bcm2835_transfer_complete()
704 if (host->mrq->stop && (data->error || !host->use_sbc)) { in bcm2835_transfer_complete()
705 if (bcm2835_send_command(host, host->mrq->stop)) { in bcm2835_transfer_complete()
707 if (!host->use_busy) in bcm2835_transfer_complete()
718 struct device *dev = &host->pdev->dev; in bcm2835_finish_data()
721 data = host->data; in bcm2835_finish_data()
723 host->hcfg &= ~(SDHCFG_DATA_IRPT_EN | SDHCFG_BLOCK_IRPT_EN); in bcm2835_finish_data()
724 writel(host->hcfg, host->ioaddr + SDHCFG); in bcm2835_finish_data()
726 data->bytes_xfered = data->error ? 0 : (data->blksz * data->blocks); in bcm2835_finish_data()
728 host->data_complete = true; in bcm2835_finish_data()
730 if (host->cmd) { in bcm2835_finish_data()
735 dev_dbg(dev, "Finished early - HSTS %08x\n", in bcm2835_finish_data()
736 readl(host->ioaddr + SDHSTS)); in bcm2835_finish_data()
744 struct device *dev = &host->pdev->dev; in bcm2835_finish_command()
745 struct mmc_command *cmd = host->cmd; in bcm2835_finish_command()
754 host->cmd->error = -EIO; in bcm2835_finish_command()
758 u32 sdhsts = readl(host->ioaddr + SDHSTS); in bcm2835_finish_command()
761 writel(SDHSTS_ERROR_MASK, host->ioaddr + SDHSTS); in bcm2835_finish_command()
764 (host->cmd->opcode != MMC_SEND_OP_COND)) { in bcm2835_finish_command()
768 host->cmd->error = -ETIMEDOUT; in bcm2835_finish_command()
771 host->cmd->opcode); in bcm2835_finish_command()
773 host->cmd->error = -EILSEQ; in bcm2835_finish_command()
775 edm = readl(host->ioaddr + SDEDM); in bcm2835_finish_command()
781 host->ioaddr + SDEDM); in bcm2835_finish_command()
787 if (cmd->flags & MMC_RSP_PRESENT) { in bcm2835_finish_command()
788 if (cmd->flags & MMC_RSP_136) { in bcm2835_finish_command()
792 cmd->resp[3 - i] = in bcm2835_finish_command()
793 readl(host->ioaddr + SDRSP0 + i * 4); in bcm2835_finish_command()
796 cmd->resp[0] = readl(host->ioaddr + SDRSP0); in bcm2835_finish_command()
800 if (cmd == host->mrq->sbc) { in bcm2835_finish_command()
802 host->cmd = NULL; in bcm2835_finish_command()
803 if (bcm2835_send_command(host, host->mrq->cmd)) { in bcm2835_finish_command()
804 if (host->data && host->dma_desc) in bcm2835_finish_command()
810 if (!host->use_busy) in bcm2835_finish_command()
813 } else if (cmd == host->mrq->stop) { in bcm2835_finish_command()
818 host->cmd = NULL; in bcm2835_finish_command()
819 if (!host->data) in bcm2835_finish_command()
821 else if (host->data_complete) in bcm2835_finish_command()
831 struct device *dev = &host->pdev->dev; in bcm2835_timeout()
833 mutex_lock(&host->mutex); in bcm2835_timeout()
835 if (host->mrq) { in bcm2835_timeout()
841 if (host->data) { in bcm2835_timeout()
842 host->data->error = -ETIMEDOUT; in bcm2835_timeout()
845 if (host->cmd) in bcm2835_timeout()
846 host->cmd->error = -ETIMEDOUT; in bcm2835_timeout()
848 host->mrq->cmd->error = -ETIMEDOUT; in bcm2835_timeout()
854 mutex_unlock(&host->mutex); in bcm2835_timeout()
859 struct device *dev = &host->pdev->dev; in bcm2835_check_cmd_error()
864 if (!host->cmd) in bcm2835_check_cmd_error()
869 host->cmd->error = -EILSEQ; in bcm2835_check_cmd_error()
872 if (host->mrq->data) in bcm2835_check_cmd_error()
873 host->mrq->data->error = -EILSEQ; in bcm2835_check_cmd_error()
875 host->cmd->error = -EILSEQ; in bcm2835_check_cmd_error()
877 if (host->mrq->data) in bcm2835_check_cmd_error()
878 host->mrq->data->error = -ETIMEDOUT; in bcm2835_check_cmd_error()
880 host->cmd->error = -ETIMEDOUT; in bcm2835_check_cmd_error()
882 host->cmd->error = -ETIMEDOUT; in bcm2835_check_cmd_error()
890 if (!host->data) in bcm2835_check_data_error()
893 host->data->error = -EILSEQ; in bcm2835_check_data_error()
895 host->data->error = -ETIMEDOUT; in bcm2835_check_data_error()
900 if (WARN_ON(!host->cmd)) { in bcm2835_busy_irq()
905 if (WARN_ON(!host->use_busy)) { in bcm2835_busy_irq()
909 host->use_busy = false; in bcm2835_busy_irq()
922 if (!host->data) in bcm2835_data_irq()
926 if (host->data->error) in bcm2835_data_irq()
929 if (host->data->flags & MMC_DATA_WRITE) { in bcm2835_data_irq()
931 host->hcfg &= ~(SDHCFG_DATA_IRPT_EN); in bcm2835_data_irq()
932 host->hcfg |= SDHCFG_BLOCK_IRPT_EN; in bcm2835_data_irq()
933 writel(host->hcfg, host->ioaddr + SDHCFG); in bcm2835_data_irq()
937 host->blocks--; in bcm2835_data_irq()
938 if ((host->blocks == 0) || host->data->error) in bcm2835_data_irq()
944 host->hcfg &= ~(SDHCFG_DATA_IRPT_EN | SDHCFG_BLOCK_IRPT_EN); in bcm2835_data_irq()
945 writel(host->hcfg, host->ioaddr + SDHCFG); in bcm2835_data_irq()
950 if (!host->data) in bcm2835_data_threaded_irq()
952 if ((host->blocks == 0) || host->data->error) in bcm2835_data_threaded_irq()
958 if (WARN_ON(!host->data)) { in bcm2835_block_irq()
963 if (!host->dma_desc) { in bcm2835_block_irq()
964 WARN_ON(!host->blocks); in bcm2835_block_irq()
965 if (host->data->error || (--host->blocks == 0)) in bcm2835_block_irq()
969 } else if (host->data->flags & MMC_DATA_WRITE) { in bcm2835_block_irq()
980 spin_lock(&host->lock); in bcm2835_irq()
982 intmask = readl(host->ioaddr + SDHSTS); in bcm2835_irq()
988 host->ioaddr + SDHSTS); in bcm2835_irq()
992 host->irq_block = true; in bcm2835_irq()
998 host->irq_busy = true; in bcm2835_irq()
1010 (host->hcfg & SDHCFG_DATA_IRPT_EN)) { in bcm2835_irq()
1012 host->irq_data = true; in bcm2835_irq()
1016 spin_unlock(&host->lock); in bcm2835_irq()
1027 spin_lock_irqsave(&host->lock, flags); in bcm2835_threaded_irq()
1029 block = host->irq_block; in bcm2835_threaded_irq()
1030 busy = host->irq_busy; in bcm2835_threaded_irq()
1031 data = host->irq_data; in bcm2835_threaded_irq()
1032 host->irq_block = false; in bcm2835_threaded_irq()
1033 host->irq_busy = false; in bcm2835_threaded_irq()
1034 host->irq_data = false; in bcm2835_threaded_irq()
1036 spin_unlock_irqrestore(&host->lock, flags); in bcm2835_threaded_irq()
1038 mutex_lock(&host->mutex); in bcm2835_threaded_irq()
1047 mutex_unlock(&host->mutex); in bcm2835_threaded_irq()
1058 mutex_lock(&host->mutex); in bcm2835_dma_complete_work()
1060 data = host->data; in bcm2835_dma_complete_work()
1062 if (host->dma_chan) { in bcm2835_dma_complete_work()
1063 dma_unmap_sg(host->dma_chan->device->dev, in bcm2835_dma_complete_work()
1064 data->sg, data->sg_len, in bcm2835_dma_complete_work()
1065 host->dma_dir); in bcm2835_dma_complete_work()
1067 host->dma_chan = NULL; in bcm2835_dma_complete_work()
1070 if (host->drain_words) { in bcm2835_dma_complete_work()
1075 if (host->drain_offset & PAGE_MASK) { in bcm2835_dma_complete_work()
1076 host->drain_page += host->drain_offset >> PAGE_SHIFT; in bcm2835_dma_complete_work()
1077 host->drain_offset &= ~PAGE_MASK; in bcm2835_dma_complete_work()
1080 page = kmap_atomic(host->drain_page); in bcm2835_dma_complete_work()
1081 buf = page + host->drain_offset; in bcm2835_dma_complete_work()
1083 while (host->drain_words) { in bcm2835_dma_complete_work()
1084 u32 edm = readl(host->ioaddr + SDEDM); in bcm2835_dma_complete_work()
1087 *(buf++) = readl(host->ioaddr + SDDATA); in bcm2835_dma_complete_work()
1088 host->drain_words--; in bcm2835_dma_complete_work()
1097 mutex_unlock(&host->mutex); in bcm2835_dma_complete_work()
1105 /* The SDCDIV register has 11 bits, and holds (div - 2). But in bcm2835_set_clock()
1110 * must be 100-400KHz, so can range check the requested in bcm2835_set_clock()
1114 * clock 250MHz -> 0->125MHz, 1->83.3MHz, 2->62.5MHz, 3->50.0MHz in bcm2835_set_clock()
1115 * 4->41.7MHz, 5->35.7MHz, 6->31.3MHz, 7->27.8MHz in bcm2835_set_clock()
1117 * 623->400KHz/27.8MHz in bcm2835_set_clock()
1118 * reset value (507)->491159/50MHz in bcm2835_set_clock()
1120 * BUT, the 3-bit clock divisor in data mode is too small if in bcm2835_set_clock()
1130 host->cdiv = SDCDIV_MAX_CDIV; in bcm2835_set_clock()
1131 writel(host->cdiv, host->ioaddr + SDCDIV); in bcm2835_set_clock()
1135 div = host->max_clk / clock; in bcm2835_set_clock()
1138 if ((host->max_clk / div) > clock) in bcm2835_set_clock()
1140 div -= 2; in bcm2835_set_clock()
1145 clock = host->max_clk / (div + 2); in bcm2835_set_clock()
1146 mmc->actual_clock = clock; in bcm2835_set_clock()
1150 host->ns_per_fifo_word = (1000000000 / clock) * in bcm2835_set_clock()
1151 ((mmc->caps & MMC_CAP_4_BIT_DATA) ? 8 : 32); in bcm2835_set_clock()
1153 host->cdiv = div; in bcm2835_set_clock()
1154 writel(host->cdiv, host->ioaddr + SDCDIV); in bcm2835_set_clock()
1157 writel(mmc->actual_clock / 2, host->ioaddr + SDTOUT); in bcm2835_set_clock()
1163 struct device *dev = &host->pdev->dev; in bcm2835_request()
1167 if (mrq->sbc) in bcm2835_request()
1168 mrq->sbc->error = 0; in bcm2835_request()
1169 if (mrq->cmd) in bcm2835_request()
1170 mrq->cmd->error = 0; in bcm2835_request()
1171 if (mrq->data) in bcm2835_request()
1172 mrq->data->error = 0; in bcm2835_request()
1173 if (mrq->stop) in bcm2835_request()
1174 mrq->stop->error = 0; in bcm2835_request()
1176 if (mrq->data && !is_power_of_2(mrq->data->blksz)) { in bcm2835_request()
1178 mrq->data->blksz); in bcm2835_request()
1180 if (mrq->cmd) in bcm2835_request()
1181 mrq->cmd->error = -EINVAL; in bcm2835_request()
1187 mutex_lock(&host->mutex); in bcm2835_request()
1189 WARN_ON(host->mrq); in bcm2835_request()
1190 host->mrq = mrq; in bcm2835_request()
1192 edm = readl(host->ioaddr + SDEDM); in bcm2835_request()
1198 readl(host->ioaddr + SDCMD) & SDCMD_CMD_MASK, in bcm2835_request()
1202 if (mrq->cmd) in bcm2835_request()
1203 mrq->cmd->error = -EILSEQ; in bcm2835_request()
1206 mutex_unlock(&host->mutex); in bcm2835_request()
1210 if (host->use_dma && mrq->data && (mrq->data->blocks > PIO_THRESHOLD)) in bcm2835_request()
1211 bcm2835_prepare_dma(host, mrq->data); in bcm2835_request()
1213 host->use_sbc = !!mrq->sbc && host->mrq->data && in bcm2835_request()
1214 (host->mrq->data->flags & MMC_DATA_READ); in bcm2835_request()
1215 if (host->use_sbc) { in bcm2835_request()
1216 if (bcm2835_send_command(host, mrq->sbc)) { in bcm2835_request()
1217 if (!host->use_busy) in bcm2835_request()
1220 } else if (mrq->cmd && bcm2835_send_command(host, mrq->cmd)) { in bcm2835_request()
1221 if (host->data && host->dma_desc) { in bcm2835_request()
1226 if (!host->use_busy) in bcm2835_request()
1230 mutex_unlock(&host->mutex); in bcm2835_request()
1237 mutex_lock(&host->mutex); in bcm2835_set_ios()
1239 if (!ios->clock || ios->clock != host->clock) { in bcm2835_set_ios()
1240 bcm2835_set_clock(host, ios->clock); in bcm2835_set_ios()
1241 host->clock = ios->clock; in bcm2835_set_ios()
1245 host->hcfg &= ~SDHCFG_WIDE_EXT_BUS; in bcm2835_set_ios()
1246 if (ios->bus_width == MMC_BUS_WIDTH_4) in bcm2835_set_ios()
1247 host->hcfg |= SDHCFG_WIDE_EXT_BUS; in bcm2835_set_ios()
1249 host->hcfg |= SDHCFG_WIDE_INT_BUS; in bcm2835_set_ios()
1252 host->hcfg |= SDHCFG_SLOW_CARD; in bcm2835_set_ios()
1254 writel(host->hcfg, host->ioaddr + SDHCFG); in bcm2835_set_ios()
1256 mutex_unlock(&host->mutex); in bcm2835_set_ios()
1268 struct device *dev = &host->pdev->dev; in bcm2835_add_host()
1272 if (!mmc->f_max || mmc->f_max > host->max_clk) in bcm2835_add_host()
1273 mmc->f_max = host->max_clk; in bcm2835_add_host()
1274 mmc->f_min = host->max_clk / SDCDIV_MAX_CDIV; in bcm2835_add_host()
1276 mmc->max_busy_timeout = ~0 / (mmc->f_max / 1000); in bcm2835_add_host()
1279 mmc->f_max, mmc->f_min, mmc->max_busy_timeout); in bcm2835_add_host()
1282 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | in bcm2835_add_host()
1285 spin_lock_init(&host->lock); in bcm2835_add_host()
1286 mutex_init(&host->mutex); in bcm2835_add_host()
1288 if (!host->dma_chan_rxtx) { in bcm2835_add_host()
1290 host->use_dma = false; in bcm2835_add_host()
1292 host->use_dma = true; in bcm2835_add_host()
1294 host->dma_cfg_tx.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; in bcm2835_add_host()
1295 host->dma_cfg_tx.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; in bcm2835_add_host()
1296 host->dma_cfg_tx.slave_id = 13; /* DREQ channel */ in bcm2835_add_host()
1297 host->dma_cfg_tx.direction = DMA_MEM_TO_DEV; in bcm2835_add_host()
1298 host->dma_cfg_tx.src_addr = 0; in bcm2835_add_host()
1299 host->dma_cfg_tx.dst_addr = host->phys_addr + SDDATA; in bcm2835_add_host()
1301 host->dma_cfg_rx.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; in bcm2835_add_host()
1302 host->dma_cfg_rx.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; in bcm2835_add_host()
1303 host->dma_cfg_rx.slave_id = 13; /* DREQ channel */ in bcm2835_add_host()
1304 host->dma_cfg_rx.direction = DMA_DEV_TO_MEM; in bcm2835_add_host()
1305 host->dma_cfg_rx.src_addr = host->phys_addr + SDDATA; in bcm2835_add_host()
1306 host->dma_cfg_rx.dst_addr = 0; in bcm2835_add_host()
1308 if (dmaengine_slave_config(host->dma_chan_rxtx, in bcm2835_add_host()
1309 &host->dma_cfg_tx) != 0 || in bcm2835_add_host()
1310 dmaengine_slave_config(host->dma_chan_rxtx, in bcm2835_add_host()
1311 &host->dma_cfg_rx) != 0) in bcm2835_add_host()
1312 host->use_dma = false; in bcm2835_add_host()
1315 mmc->max_segs = 128; in bcm2835_add_host()
1316 mmc->max_req_size = min_t(size_t, 524288, dma_max_mapping_size(dev)); in bcm2835_add_host()
1317 mmc->max_seg_size = mmc->max_req_size; in bcm2835_add_host()
1318 mmc->max_blk_size = 1024; in bcm2835_add_host()
1319 mmc->max_blk_count = 65535; in bcm2835_add_host()
1322 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; in bcm2835_add_host()
1324 INIT_WORK(&host->dma_work, bcm2835_dma_complete_work); in bcm2835_add_host()
1325 INIT_DELAYED_WORK(&host->timeout_work, bcm2835_timeout); in bcm2835_add_host()
1328 host->hcfg = SDHCFG_BUSY_IRPT_EN; in bcm2835_add_host()
1332 ret = request_threaded_irq(host->irq, bcm2835_irq, in bcm2835_add_host()
1336 dev_err(dev, "failed to request IRQ %d: %d\n", host->irq, ret); in bcm2835_add_host()
1342 free_irq(host->irq, host); in bcm2835_add_host()
1347 if (host->use_dma && (PIO_THRESHOLD > 0)) in bcm2835_add_host()
1349 dev_info(dev, "loaded - DMA %s%s\n", in bcm2835_add_host()
1350 host->use_dma ? "enabled" : "disabled", pio_limit_string); in bcm2835_add_host()
1357 struct device *dev = &pdev->dev; in bcm2835_probe()
1367 return -ENOMEM; in bcm2835_probe()
1369 mmc->ops = &bcm2835_ops; in bcm2835_probe()
1371 host->pdev = pdev; in bcm2835_probe()
1372 spin_lock_init(&host->lock); in bcm2835_probe()
1374 host->ioaddr = devm_platform_ioremap_resource(pdev, 0); in bcm2835_probe()
1375 if (IS_ERR(host->ioaddr)) { in bcm2835_probe()
1376 ret = PTR_ERR(host->ioaddr); in bcm2835_probe()
1383 regaddr_p = of_get_address(pdev->dev.of_node, 0, NULL, NULL); in bcm2835_probe()
1386 ret = -EINVAL; in bcm2835_probe()
1390 host->phys_addr = be32_to_cpup(regaddr_p); in bcm2835_probe()
1392 host->dma_chan = NULL; in bcm2835_probe()
1393 host->dma_desc = NULL; in bcm2835_probe()
1395 host->dma_chan_rxtx = dma_request_chan(dev, "rx-tx"); in bcm2835_probe()
1396 if (IS_ERR(host->dma_chan_rxtx)) { in bcm2835_probe()
1397 ret = PTR_ERR(host->dma_chan_rxtx); in bcm2835_probe()
1398 host->dma_chan_rxtx = NULL; in bcm2835_probe()
1400 if (ret == -EPROBE_DEFER) in bcm2835_probe()
1413 host->max_clk = clk_get_rate(clk); in bcm2835_probe()
1415 host->irq = platform_get_irq(pdev, 0); in bcm2835_probe()
1416 if (host->irq < 0) { in bcm2835_probe()
1417 ret = host->irq; in bcm2835_probe()
1431 dev_dbg(dev, "%s -> OK\n", __func__); in bcm2835_probe()
1436 dev_dbg(dev, "%s -> err %d\n", __func__, ret); in bcm2835_probe()
1437 if (host->dma_chan_rxtx) in bcm2835_probe()
1438 dma_release_channel(host->dma_chan_rxtx); in bcm2835_probe()
1451 writel(SDVDD_POWER_OFF, host->ioaddr + SDVDD); in bcm2835_remove()
1453 free_irq(host->irq, host); in bcm2835_remove()
1455 cancel_work_sync(&host->dma_work); in bcm2835_remove()
1456 cancel_delayed_work_sync(&host->timeout_work); in bcm2835_remove()
1458 if (host->dma_chan_rxtx) in bcm2835_remove()
1459 dma_release_channel(host->dma_chan_rxtx); in bcm2835_remove()
1467 { .compatible = "brcm,bcm2835-sdhost" },
1476 .name = "sdhost-bcm2835",
1483 MODULE_ALIAS("platform:sdhost-bcm2835");
1484 MODULE_DESCRIPTION("BCM2835 SDHost driver");