1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
4 * Copyright (C) 2013, Imagination Technologies
6 * JZ4740 SD/MMC controller driver
9 #include <linux/bitops.h>
10 #include <linux/clk.h>
11 #include <linux/delay.h>
12 #include <linux/dmaengine.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/err.h>
15 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <linux/mmc/host.h>
19 #include <linux/mmc/slot-gpio.h>
20 #include <linux/module.h>
21 #include <linux/of_device.h>
22 #include <linux/pinctrl/consumer.h>
23 #include <linux/platform_device.h>
24 #include <linux/scatterlist.h>
26 #include <asm/cacheflush.h>
28 #define JZ_REG_MMC_STRPCL 0x00
29 #define JZ_REG_MMC_STATUS 0x04
30 #define JZ_REG_MMC_CLKRT 0x08
31 #define JZ_REG_MMC_CMDAT 0x0C
32 #define JZ_REG_MMC_RESTO 0x10
33 #define JZ_REG_MMC_RDTO 0x14
34 #define JZ_REG_MMC_BLKLEN 0x18
35 #define JZ_REG_MMC_NOB 0x1C
36 #define JZ_REG_MMC_SNOB 0x20
37 #define JZ_REG_MMC_IMASK 0x24
38 #define JZ_REG_MMC_IREG 0x28
39 #define JZ_REG_MMC_CMD 0x2C
40 #define JZ_REG_MMC_ARG 0x30
41 #define JZ_REG_MMC_RESP_FIFO 0x34
42 #define JZ_REG_MMC_RXFIFO 0x38
43 #define JZ_REG_MMC_TXFIFO 0x3C
44 #define JZ_REG_MMC_LPM 0x40
45 #define JZ_REG_MMC_DMAC 0x44
47 #define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
48 #define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6)
49 #define JZ_MMC_STRPCL_START_READWAIT BIT(5)
50 #define JZ_MMC_STRPCL_STOP_READWAIT BIT(4)
51 #define JZ_MMC_STRPCL_RESET BIT(3)
52 #define JZ_MMC_STRPCL_START_OP BIT(2)
53 #define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0))
54 #define JZ_MMC_STRPCL_CLOCK_STOP BIT(0)
55 #define JZ_MMC_STRPCL_CLOCK_START BIT(1)
58 #define JZ_MMC_STATUS_IS_RESETTING BIT(15)
59 #define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14)
60 #define JZ_MMC_STATUS_PRG_DONE BIT(13)
61 #define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12)
62 #define JZ_MMC_STATUS_END_CMD_RES BIT(11)
63 #define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10)
64 #define JZ_MMC_STATUS_IS_READWAIT BIT(9)
65 #define JZ_MMC_STATUS_CLK_EN BIT(8)
66 #define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7)
67 #define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6)
68 #define JZ_MMC_STATUS_CRC_RES_ERR BIT(5)
69 #define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4)
70 #define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3)
71 #define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2)
72 #define JZ_MMC_STATUS_TIMEOUT_RES BIT(1)
73 #define JZ_MMC_STATUS_TIMEOUT_READ BIT(0)
75 #define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0))
76 #define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2))
79 #define JZ_MMC_CMDAT_IO_ABORT BIT(11)
80 #define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)
81 #define JZ_MMC_CMDAT_BUS_WIDTH_8BIT (BIT(10) | BIT(9))
82 #define JZ_MMC_CMDAT_BUS_WIDTH_MASK (BIT(10) | BIT(9))
83 #define JZ_MMC_CMDAT_DMA_EN BIT(8)
84 #define JZ_MMC_CMDAT_INIT BIT(7)
85 #define JZ_MMC_CMDAT_BUSY BIT(6)
86 #define JZ_MMC_CMDAT_STREAM BIT(5)
87 #define JZ_MMC_CMDAT_WRITE BIT(4)
88 #define JZ_MMC_CMDAT_DATA_EN BIT(3)
89 #define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0))
90 #define JZ_MMC_CMDAT_RSP_R1 1
91 #define JZ_MMC_CMDAT_RSP_R2 2
92 #define JZ_MMC_CMDAT_RSP_R3 3
94 #define JZ_MMC_IRQ_SDIO BIT(7)
95 #define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6)
96 #define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5)
97 #define JZ_MMC_IRQ_END_CMD_RES BIT(2)
98 #define JZ_MMC_IRQ_PRG_DONE BIT(1)
99 #define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0)
101 #define JZ_MMC_DMAC_DMA_SEL BIT(1)
102 #define JZ_MMC_DMAC_DMA_EN BIT(0)
104 #define JZ_MMC_LPM_DRV_RISING BIT(31)
105 #define JZ_MMC_LPM_DRV_RISING_QTR_PHASE_DLY BIT(31)
106 #define JZ_MMC_LPM_DRV_RISING_1NS_DLY BIT(30)
107 #define JZ_MMC_LPM_SMP_RISING_QTR_OR_HALF_PHASE_DLY BIT(29)
108 #define JZ_MMC_LPM_LOW_POWER_MODE_EN BIT(0)
110 #define JZ_MMC_CLK_RATE 24000000
111 #define JZ_MMC_REQ_TIMEOUT_MS 5000
113 enum jz4740_mmc_version {
121 enum jz4740_mmc_state {
122 JZ4740_MMC_STATE_READ_RESPONSE,
123 JZ4740_MMC_STATE_TRANSFER_DATA,
124 JZ4740_MMC_STATE_SEND_STOP,
125 JZ4740_MMC_STATE_DONE,
129 * The MMC core allows to prepare a mmc_request while another mmc_request
130 * is in-flight. This is used via the pre_req/post_req hooks.
131 * This driver uses the pre_req/post_req hooks to map/unmap the mmc_request.
132 * Following what other drivers do (sdhci, dw_mmc) we use the following cookie
133 * flags to keep track of the mmc_request mapping state.
135 * COOKIE_UNMAPPED: the request is not mapped.
136 * COOKIE_PREMAPPED: the request was mapped in pre_req,
137 * and should be unmapped in post_req.
138 * COOKIE_MAPPED: the request was mapped in the irq handler,
139 * and should be unmapped before mmc_request_done is called..
147 struct jz4740_mmc_host {
148 struct mmc_host *mmc;
149 struct platform_device *pdev;
152 enum jz4740_mmc_version version;
157 struct resource *mem_res;
158 struct mmc_request *req;
159 struct mmc_command *cmd;
161 unsigned long waiting;
169 struct timer_list timeout_timer;
170 struct sg_mapping_iter miter;
171 enum jz4740_mmc_state state;
174 struct dma_chan *dma_rx;
175 struct dma_chan *dma_tx;
178 /* The DMA trigger level is 8 words, that is to say, the DMA read
179 * trigger is when data words in MSC_RXFIFO is >= 8 and the DMA write
180 * trigger is when data words in MSC_TXFIFO is < 8.
182 #define JZ4740_MMC_FIFO_HALF_SIZE 8
185 static void jz4740_mmc_write_irq_mask(struct jz4740_mmc_host *host,
188 if (host->version >= JZ_MMC_JZ4725B)
189 return writel(val, host->base + JZ_REG_MMC_IMASK);
191 return writew(val, host->base + JZ_REG_MMC_IMASK);
194 static void jz4740_mmc_write_irq_reg(struct jz4740_mmc_host *host,
197 if (host->version >= JZ_MMC_JZ4780)
198 writel(val, host->base + JZ_REG_MMC_IREG);
200 writew(val, host->base + JZ_REG_MMC_IREG);
203 static uint32_t jz4740_mmc_read_irq_reg(struct jz4740_mmc_host *host)
205 if (host->version >= JZ_MMC_JZ4780)
206 return readl(host->base + JZ_REG_MMC_IREG);
208 return readw(host->base + JZ_REG_MMC_IREG);
211 /*----------------------------------------------------------------------------*/
212 /* DMA infrastructure */
214 static void jz4740_mmc_release_dma_channels(struct jz4740_mmc_host *host)
219 dma_release_channel(host->dma_tx);
220 dma_release_channel(host->dma_rx);
223 static int jz4740_mmc_acquire_dma_channels(struct jz4740_mmc_host *host)
225 host->dma_tx = dma_request_chan(mmc_dev(host->mmc), "tx");
226 if (IS_ERR(host->dma_tx)) {
227 dev_err(mmc_dev(host->mmc), "Failed to get dma_tx channel\n");
228 return PTR_ERR(host->dma_tx);
231 host->dma_rx = dma_request_chan(mmc_dev(host->mmc), "rx");
232 if (IS_ERR(host->dma_rx)) {
233 dev_err(mmc_dev(host->mmc), "Failed to get dma_rx channel\n");
234 dma_release_channel(host->dma_tx);
235 return PTR_ERR(host->dma_rx);
241 static inline struct dma_chan *jz4740_mmc_get_dma_chan(struct jz4740_mmc_host *host,
242 struct mmc_data *data)
244 return (data->flags & MMC_DATA_READ) ? host->dma_rx : host->dma_tx;
247 static void jz4740_mmc_dma_unmap(struct jz4740_mmc_host *host,
248 struct mmc_data *data)
250 struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
251 enum dma_data_direction dir = mmc_get_dma_dir(data);
253 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir);
254 data->host_cookie = COOKIE_UNMAPPED;
257 /* Prepares DMA data for current or next transfer.
258 * A request can be in-flight when this is called.
260 static int jz4740_mmc_prepare_dma_data(struct jz4740_mmc_host *host,
261 struct mmc_data *data,
264 struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
265 enum dma_data_direction dir = mmc_get_dma_dir(data);
268 if (data->host_cookie == COOKIE_PREMAPPED)
269 return data->sg_count;
271 sg_count = dma_map_sg(chan->device->dev,
277 dev_err(mmc_dev(host->mmc),
278 "Failed to map scatterlist for DMA operation\n");
282 data->sg_count = sg_count;
283 data->host_cookie = cookie;
285 return data->sg_count;
288 static int jz4740_mmc_start_dma_transfer(struct jz4740_mmc_host *host,
289 struct mmc_data *data)
291 struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
292 struct dma_async_tx_descriptor *desc;
293 struct dma_slave_config conf = {
294 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
295 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
296 .src_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
297 .dst_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
301 if (data->flags & MMC_DATA_WRITE) {
302 conf.direction = DMA_MEM_TO_DEV;
303 conf.dst_addr = host->mem_res->start + JZ_REG_MMC_TXFIFO;
305 conf.direction = DMA_DEV_TO_MEM;
306 conf.src_addr = host->mem_res->start + JZ_REG_MMC_RXFIFO;
309 sg_count = jz4740_mmc_prepare_dma_data(host, data, COOKIE_MAPPED);
313 dmaengine_slave_config(chan, &conf);
314 desc = dmaengine_prep_slave_sg(chan, data->sg, sg_count,
316 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
318 dev_err(mmc_dev(host->mmc),
319 "Failed to allocate DMA %s descriptor",
320 conf.direction == DMA_MEM_TO_DEV ? "TX" : "RX");
324 dmaengine_submit(desc);
325 dma_async_issue_pending(chan);
330 if (data->host_cookie == COOKIE_MAPPED)
331 jz4740_mmc_dma_unmap(host, data);
335 static void jz4740_mmc_pre_request(struct mmc_host *mmc,
336 struct mmc_request *mrq)
338 struct jz4740_mmc_host *host = mmc_priv(mmc);
339 struct mmc_data *data = mrq->data;
344 data->host_cookie = COOKIE_UNMAPPED;
345 if (jz4740_mmc_prepare_dma_data(host, data, COOKIE_PREMAPPED) < 0)
346 data->host_cookie = COOKIE_UNMAPPED;
349 static void jz4740_mmc_post_request(struct mmc_host *mmc,
350 struct mmc_request *mrq,
353 struct jz4740_mmc_host *host = mmc_priv(mmc);
354 struct mmc_data *data = mrq->data;
356 if (data && data->host_cookie != COOKIE_UNMAPPED)
357 jz4740_mmc_dma_unmap(host, data);
360 struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
362 dmaengine_terminate_all(chan);
366 /*----------------------------------------------------------------------------*/
368 static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
369 unsigned int irq, bool enabled)
373 spin_lock_irqsave(&host->lock, flags);
375 host->irq_mask &= ~irq;
377 host->irq_mask |= irq;
379 jz4740_mmc_write_irq_mask(host, host->irq_mask);
380 spin_unlock_irqrestore(&host->lock, flags);
383 static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host,
386 uint16_t val = JZ_MMC_STRPCL_CLOCK_START;
389 val |= JZ_MMC_STRPCL_START_OP;
391 writew(val, host->base + JZ_REG_MMC_STRPCL);
394 static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host)
397 unsigned int timeout = 1000;
399 writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL);
401 status = readl(host->base + JZ_REG_MMC_STATUS);
402 } while (status & JZ_MMC_STATUS_CLK_EN && --timeout);
405 static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
408 unsigned int timeout = 1000;
410 writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL);
413 status = readl(host->base + JZ_REG_MMC_STATUS);
414 } while (status & JZ_MMC_STATUS_IS_RESETTING && --timeout);
417 static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
419 struct mmc_request *req;
420 struct mmc_data *data;
426 if (data && data->host_cookie == COOKIE_MAPPED)
427 jz4740_mmc_dma_unmap(host, data);
428 mmc_request_done(host->mmc, req);
431 static unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host,
434 unsigned int timeout = 0x800;
438 status = jz4740_mmc_read_irq_reg(host);
439 } while (!(status & irq) && --timeout);
442 set_bit(0, &host->waiting);
443 mod_timer(&host->timeout_timer,
444 jiffies + msecs_to_jiffies(JZ_MMC_REQ_TIMEOUT_MS));
445 jz4740_mmc_set_irq_enabled(host, irq, true);
452 static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host,
453 struct mmc_data *data)
457 status = readl(host->base + JZ_REG_MMC_STATUS);
458 if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) {
459 if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
460 host->req->cmd->error = -ETIMEDOUT;
461 data->error = -ETIMEDOUT;
463 host->req->cmd->error = -EIO;
466 } else if (status & JZ_MMC_STATUS_READ_ERROR_MASK) {
467 if (status & (JZ_MMC_STATUS_TIMEOUT_READ)) {
468 host->req->cmd->error = -ETIMEDOUT;
469 data->error = -ETIMEDOUT;
471 host->req->cmd->error = -EIO;
477 static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
478 struct mmc_data *data)
480 struct sg_mapping_iter *miter = &host->miter;
481 void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO;
486 while (sg_miter_next(miter)) {
488 i = miter->length / 4;
492 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
493 if (unlikely(timeout))
496 writel(buf[0], fifo_addr);
497 writel(buf[1], fifo_addr);
498 writel(buf[2], fifo_addr);
499 writel(buf[3], fifo_addr);
500 writel(buf[4], fifo_addr);
501 writel(buf[5], fifo_addr);
502 writel(buf[6], fifo_addr);
503 writel(buf[7], fifo_addr);
508 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
509 if (unlikely(timeout))
513 writel(*buf, fifo_addr);
518 data->bytes_xfered += miter->length;
520 sg_miter_stop(miter);
525 miter->consumed = (void *)buf - miter->addr;
526 data->bytes_xfered += miter->consumed;
527 sg_miter_stop(miter);
532 static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host,
533 struct mmc_data *data)
535 struct sg_mapping_iter *miter = &host->miter;
536 void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO;
541 unsigned int timeout;
543 while (sg_miter_next(miter)) {
549 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
550 if (unlikely(timeout))
553 buf[0] = readl(fifo_addr);
554 buf[1] = readl(fifo_addr);
555 buf[2] = readl(fifo_addr);
556 buf[3] = readl(fifo_addr);
557 buf[4] = readl(fifo_addr);
558 buf[5] = readl(fifo_addr);
559 buf[6] = readl(fifo_addr);
560 buf[7] = readl(fifo_addr);
567 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
568 if (unlikely(timeout))
572 *buf++ = readl(fifo_addr);
575 if (unlikely(i > 0)) {
576 d = readl(fifo_addr);
580 data->bytes_xfered += miter->length;
582 /* This can go away once MIPS implements
583 * flush_kernel_dcache_page */
584 flush_dcache_page(miter->page);
586 sg_miter_stop(miter);
588 /* For whatever reason there is sometime one word more in the fifo then
591 status = readl(host->base + JZ_REG_MMC_STATUS);
592 while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) {
593 d = readl(fifo_addr);
594 status = readl(host->base + JZ_REG_MMC_STATUS);
600 miter->consumed = (void *)buf - miter->addr;
601 data->bytes_xfered += miter->consumed;
602 sg_miter_stop(miter);
607 static void jz4740_mmc_timeout(struct timer_list *t)
609 struct jz4740_mmc_host *host = from_timer(host, t, timeout_timer);
611 if (!test_and_clear_bit(0, &host->waiting))
614 jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
616 host->req->cmd->error = -ETIMEDOUT;
617 jz4740_mmc_request_done(host);
620 static void jz4740_mmc_read_response(struct jz4740_mmc_host *host,
621 struct mmc_command *cmd)
625 void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO;
627 if (cmd->flags & MMC_RSP_136) {
628 tmp = readw(fifo_addr);
629 for (i = 0; i < 4; ++i) {
630 cmd->resp[i] = tmp << 24;
631 tmp = readw(fifo_addr);
632 cmd->resp[i] |= tmp << 8;
633 tmp = readw(fifo_addr);
634 cmd->resp[i] |= tmp >> 8;
637 cmd->resp[0] = readw(fifo_addr) << 24;
638 cmd->resp[0] |= readw(fifo_addr) << 8;
639 cmd->resp[0] |= readw(fifo_addr) & 0xff;
643 static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
644 struct mmc_command *cmd)
646 uint32_t cmdat = host->cmdat;
648 host->cmdat &= ~JZ_MMC_CMDAT_INIT;
649 jz4740_mmc_clock_disable(host);
653 if (cmd->flags & MMC_RSP_BUSY)
654 cmdat |= JZ_MMC_CMDAT_BUSY;
656 switch (mmc_resp_type(cmd)) {
659 cmdat |= JZ_MMC_CMDAT_RSP_R1;
662 cmdat |= JZ_MMC_CMDAT_RSP_R2;
665 cmdat |= JZ_MMC_CMDAT_RSP_R3;
672 cmdat |= JZ_MMC_CMDAT_DATA_EN;
673 if (cmd->data->flags & MMC_DATA_WRITE)
674 cmdat |= JZ_MMC_CMDAT_WRITE;
677 * The JZ4780's MMC controller has integrated DMA ability
678 * in addition to being able to use the external DMA
679 * controller. It moves DMA control bits to a separate
680 * register. The DMA_SEL bit chooses the external
681 * controller over the integrated one. Earlier SoCs
682 * can only use the external controller, and have a
683 * single DMA enable bit in CMDAT.
685 if (host->version >= JZ_MMC_JZ4780) {
686 writel(JZ_MMC_DMAC_DMA_EN | JZ_MMC_DMAC_DMA_SEL,
687 host->base + JZ_REG_MMC_DMAC);
689 cmdat |= JZ_MMC_CMDAT_DMA_EN;
691 } else if (host->version >= JZ_MMC_JZ4780) {
692 writel(0, host->base + JZ_REG_MMC_DMAC);
695 writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
696 writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
699 writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD);
700 writel(cmd->arg, host->base + JZ_REG_MMC_ARG);
701 writel(cmdat, host->base + JZ_REG_MMC_CMDAT);
703 jz4740_mmc_clock_enable(host, 1);
706 static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
708 struct mmc_command *cmd = host->req->cmd;
709 struct mmc_data *data = cmd->data;
712 if (data->flags & MMC_DATA_READ)
713 direction = SG_MITER_TO_SG;
715 direction = SG_MITER_FROM_SG;
717 sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
721 static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
723 struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
724 struct mmc_command *cmd = host->req->cmd;
725 struct mmc_request *req = host->req;
726 struct mmc_data *data = cmd->data;
727 bool timeout = false;
730 host->state = JZ4740_MMC_STATE_DONE;
732 switch (host->state) {
733 case JZ4740_MMC_STATE_READ_RESPONSE:
734 if (cmd->flags & MMC_RSP_PRESENT)
735 jz4740_mmc_read_response(host, cmd);
740 jz_mmc_prepare_data_transfer(host);
743 case JZ4740_MMC_STATE_TRANSFER_DATA:
745 /* Use DMA if enabled.
746 * Data transfer direction is defined later by
747 * relying on data flags in
748 * jz4740_mmc_prepare_dma_data() and
749 * jz4740_mmc_start_dma_transfer().
751 timeout = jz4740_mmc_start_dma_transfer(host, data);
752 data->bytes_xfered = data->blocks * data->blksz;
753 } else if (data->flags & MMC_DATA_READ)
754 /* Use PIO if DMA is not enabled.
755 * Data transfer direction was defined before
756 * by relying on data flags in
757 * jz_mmc_prepare_data_transfer().
759 timeout = jz4740_mmc_read_data(host, data);
761 timeout = jz4740_mmc_write_data(host, data);
763 if (unlikely(timeout)) {
764 host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
768 jz4740_mmc_transfer_check_state(host, data);
770 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
771 if (unlikely(timeout)) {
772 host->state = JZ4740_MMC_STATE_SEND_STOP;
775 jz4740_mmc_write_irq_reg(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
778 case JZ4740_MMC_STATE_SEND_STOP:
782 jz4740_mmc_send_command(host, req->stop);
784 if (mmc_resp_type(req->stop) & MMC_RSP_BUSY) {
785 timeout = jz4740_mmc_poll_irq(host,
786 JZ_MMC_IRQ_PRG_DONE);
788 host->state = JZ4740_MMC_STATE_DONE;
794 case JZ4740_MMC_STATE_DONE:
799 jz4740_mmc_request_done(host);
804 static irqreturn_t jz_mmc_irq(int irq, void *devid)
806 struct jz4740_mmc_host *host = devid;
807 struct mmc_command *cmd = host->cmd;
808 uint32_t irq_reg, status, tmp;
810 status = readl(host->base + JZ_REG_MMC_STATUS);
811 irq_reg = jz4740_mmc_read_irq_reg(host);
814 irq_reg &= ~host->irq_mask;
816 tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
817 JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
820 jz4740_mmc_write_irq_reg(host, tmp & ~irq_reg);
822 if (irq_reg & JZ_MMC_IRQ_SDIO) {
823 jz4740_mmc_write_irq_reg(host, JZ_MMC_IRQ_SDIO);
824 mmc_signal_sdio_irq(host->mmc);
825 irq_reg &= ~JZ_MMC_IRQ_SDIO;
828 if (host->req && cmd && irq_reg) {
829 if (test_and_clear_bit(0, &host->waiting)) {
830 del_timer(&host->timeout_timer);
832 if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
833 cmd->error = -ETIMEDOUT;
834 } else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
836 } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
837 JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
839 cmd->data->error = -EIO;
843 jz4740_mmc_set_irq_enabled(host, irq_reg, false);
844 jz4740_mmc_write_irq_reg(host, irq_reg);
846 return IRQ_WAKE_THREAD;
853 static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
858 jz4740_mmc_clock_disable(host);
859 clk_set_rate(host->clk, host->mmc->f_max);
861 real_rate = clk_get_rate(host->clk);
863 while (real_rate > rate && div < 7) {
868 writew(div, host->base + JZ_REG_MMC_CLKRT);
870 if (real_rate > 25000000) {
871 if (host->version >= JZ_MMC_JZ4780) {
872 writel(JZ_MMC_LPM_DRV_RISING_QTR_PHASE_DLY |
873 JZ_MMC_LPM_SMP_RISING_QTR_OR_HALF_PHASE_DLY |
874 JZ_MMC_LPM_LOW_POWER_MODE_EN,
875 host->base + JZ_REG_MMC_LPM);
876 } else if (host->version >= JZ_MMC_JZ4760) {
877 writel(JZ_MMC_LPM_DRV_RISING |
878 JZ_MMC_LPM_LOW_POWER_MODE_EN,
879 host->base + JZ_REG_MMC_LPM);
880 } else if (host->version >= JZ_MMC_JZ4725B)
881 writel(JZ_MMC_LPM_LOW_POWER_MODE_EN,
882 host->base + JZ_REG_MMC_LPM);
888 static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
890 struct jz4740_mmc_host *host = mmc_priv(mmc);
894 jz4740_mmc_write_irq_reg(host, ~0);
895 jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true);
897 host->state = JZ4740_MMC_STATE_READ_RESPONSE;
898 set_bit(0, &host->waiting);
899 mod_timer(&host->timeout_timer,
900 jiffies + msecs_to_jiffies(JZ_MMC_REQ_TIMEOUT_MS));
901 jz4740_mmc_send_command(host, req->cmd);
904 static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
906 struct jz4740_mmc_host *host = mmc_priv(mmc);
908 jz4740_mmc_set_clock_rate(host, ios->clock);
910 switch (ios->power_mode) {
912 jz4740_mmc_reset(host);
913 if (!IS_ERR(mmc->supply.vmmc))
914 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
915 host->cmdat |= JZ_MMC_CMDAT_INIT;
916 clk_prepare_enable(host->clk);
921 if (!IS_ERR(mmc->supply.vmmc))
922 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
923 clk_disable_unprepare(host->clk);
927 switch (ios->bus_width) {
928 case MMC_BUS_WIDTH_1:
929 host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;
931 case MMC_BUS_WIDTH_4:
932 host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;
933 host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
935 case MMC_BUS_WIDTH_8:
936 host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;
937 host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_8BIT;
944 static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
946 struct jz4740_mmc_host *host = mmc_priv(mmc);
947 jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
950 static const struct mmc_host_ops jz4740_mmc_ops = {
951 .request = jz4740_mmc_request,
952 .pre_req = jz4740_mmc_pre_request,
953 .post_req = jz4740_mmc_post_request,
954 .set_ios = jz4740_mmc_set_ios,
955 .get_ro = mmc_gpio_get_ro,
956 .get_cd = mmc_gpio_get_cd,
957 .enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
960 static const struct of_device_id jz4740_mmc_of_match[] = {
961 { .compatible = "ingenic,jz4740-mmc", .data = (void *) JZ_MMC_JZ4740 },
962 { .compatible = "ingenic,jz4725b-mmc", .data = (void *)JZ_MMC_JZ4725B },
963 { .compatible = "ingenic,jz4760-mmc", .data = (void *) JZ_MMC_JZ4760 },
964 { .compatible = "ingenic,jz4775-mmc", .data = (void *) JZ_MMC_JZ4780 },
965 { .compatible = "ingenic,jz4780-mmc", .data = (void *) JZ_MMC_JZ4780 },
966 { .compatible = "ingenic,x1000-mmc", .data = (void *) JZ_MMC_X1000 },
969 MODULE_DEVICE_TABLE(of, jz4740_mmc_of_match);
971 static int jz4740_mmc_probe(struct platform_device* pdev)
974 struct mmc_host *mmc;
975 struct jz4740_mmc_host *host;
976 const struct of_device_id *match;
978 mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev);
980 dev_err(&pdev->dev, "Failed to alloc mmc host structure\n");
984 host = mmc_priv(mmc);
986 match = of_match_device(jz4740_mmc_of_match, &pdev->dev);
988 host->version = (enum jz4740_mmc_version)match->data;
990 /* JZ4740 should be the only one using legacy probe */
991 host->version = JZ_MMC_JZ4740;
994 ret = mmc_of_parse(mmc);
996 dev_err_probe(&pdev->dev, ret, "could not parse device properties\n");
1000 mmc_regulator_get_supply(mmc);
1002 host->irq = platform_get_irq(pdev, 0);
1003 if (host->irq < 0) {
1008 host->clk = devm_clk_get(&pdev->dev, "mmc");
1009 if (IS_ERR(host->clk)) {
1010 ret = PTR_ERR(host->clk);
1011 dev_err(&pdev->dev, "Failed to get mmc clock\n");
1015 host->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1016 host->base = devm_ioremap_resource(&pdev->dev, host->mem_res);
1017 if (IS_ERR(host->base)) {
1018 ret = PTR_ERR(host->base);
1022 mmc->ops = &jz4740_mmc_ops;
1024 mmc->f_max = JZ_MMC_CLK_RATE;
1025 mmc->f_min = mmc->f_max / 128;
1026 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1029 * We use a fixed timeout of 5s, hence inform the core about it. A
1030 * future improvement should instead respect the cmd->busy_timeout.
1032 mmc->max_busy_timeout = JZ_MMC_REQ_TIMEOUT_MS;
1034 mmc->max_blk_size = (1 << 10) - 1;
1035 mmc->max_blk_count = (1 << 15) - 1;
1036 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1038 mmc->max_segs = 128;
1039 mmc->max_seg_size = mmc->max_req_size;
1043 spin_lock_init(&host->lock);
1044 host->irq_mask = ~0;
1046 jz4740_mmc_reset(host);
1048 ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0,
1049 dev_name(&pdev->dev), host);
1051 dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
1055 jz4740_mmc_clock_disable(host);
1056 timer_setup(&host->timeout_timer, jz4740_mmc_timeout, 0);
1058 ret = jz4740_mmc_acquire_dma_channels(host);
1059 if (ret == -EPROBE_DEFER)
1061 host->use_dma = !ret;
1063 platform_set_drvdata(pdev, host);
1064 ret = mmc_add_host(mmc);
1067 dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret);
1068 goto err_release_dma;
1070 dev_info(&pdev->dev, "Ingenic SD/MMC card driver registered\n");
1072 dev_info(&pdev->dev, "Using %s, %d-bit mode\n",
1073 host->use_dma ? "DMA" : "PIO",
1074 (mmc->caps & MMC_CAP_8_BIT_DATA) ? 8 :
1075 ((mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1));
1081 jz4740_mmc_release_dma_channels(host);
1083 free_irq(host->irq, host);
1090 static int jz4740_mmc_remove(struct platform_device *pdev)
1092 struct jz4740_mmc_host *host = platform_get_drvdata(pdev);
1094 del_timer_sync(&host->timeout_timer);
1095 jz4740_mmc_set_irq_enabled(host, 0xff, false);
1096 jz4740_mmc_reset(host);
1098 mmc_remove_host(host->mmc);
1100 free_irq(host->irq, host);
1103 jz4740_mmc_release_dma_channels(host);
1105 mmc_free_host(host->mmc);
1110 static int __maybe_unused jz4740_mmc_suspend(struct device *dev)
1112 return pinctrl_pm_select_sleep_state(dev);
1115 static int __maybe_unused jz4740_mmc_resume(struct device *dev)
1117 return pinctrl_select_default_state(dev);
1120 static SIMPLE_DEV_PM_OPS(jz4740_mmc_pm_ops, jz4740_mmc_suspend,
1123 static struct platform_driver jz4740_mmc_driver = {
1124 .probe = jz4740_mmc_probe,
1125 .remove = jz4740_mmc_remove,
1127 .name = "jz4740-mmc",
1128 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1129 .of_match_table = of_match_ptr(jz4740_mmc_of_match),
1130 .pm = pm_ptr(&jz4740_mmc_pm_ops),
1134 module_platform_driver(jz4740_mmc_driver);
1136 MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver");
1137 MODULE_LICENSE("GPL");
1138 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");