2 * linux/drivers/mmc/host/tmio_mmc_pio.c
4 * Copyright (C) 2011 Guennadi Liakhovetski
5 * Copyright (C) 2007 Ian Molton
6 * Copyright (C) 2004 Ian Molton
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 * Driver for the MMC / SD / SDIO IP found in:
14 * TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs
16 * This driver draws mainly on scattered spec sheets, Reverse engineering
17 * of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit
18 * support). (Further 4 bit support from a later datasheet).
21 * Investigate using a workqueue for PIO transfers
24 * Better Power management
25 * Handle MMC errors better
26 * double buffer support
30 #include <linux/delay.h>
31 #include <linux/device.h>
32 #include <linux/highmem.h>
33 #include <linux/interrupt.h>
35 #include <linux/irq.h>
36 #include <linux/mfd/tmio.h>
37 #include <linux/mmc/host.h>
38 #include <linux/mmc/mmc.h>
39 #include <linux/mmc/slot-gpio.h>
40 #include <linux/mmc/tmio.h>
41 #include <linux/module.h>
42 #include <linux/pagemap.h>
43 #include <linux/platform_device.h>
44 #include <linux/pm_qos.h>
45 #include <linux/pm_runtime.h>
46 #include <linux/regulator/consumer.h>
47 #include <linux/scatterlist.h>
48 #include <linux/spinlock.h>
49 #include <linux/workqueue.h>
53 void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
55 host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
56 sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
59 void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
61 host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
62 sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
65 static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
67 sd_ctrl_write32(host, CTL_STATUS, ~i);
70 static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
72 host->sg_len = data->sg_len;
73 host->sg_ptr = data->sg;
74 host->sg_orig = data->sg;
78 static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
80 host->sg_ptr = sg_next(host->sg_ptr);
82 return --host->sg_len;
85 #ifdef CONFIG_MMC_DEBUG
87 #define STATUS_TO_TEXT(a, status, i) \
89 if (status & TMIO_STAT_##a) { \
96 static void pr_debug_status(u32 status)
99 pr_debug("status: %08x = ", status);
100 STATUS_TO_TEXT(CARD_REMOVE, status, i);
101 STATUS_TO_TEXT(CARD_INSERT, status, i);
102 STATUS_TO_TEXT(SIGSTATE, status, i);
103 STATUS_TO_TEXT(WRPROTECT, status, i);
104 STATUS_TO_TEXT(CARD_REMOVE_A, status, i);
105 STATUS_TO_TEXT(CARD_INSERT_A, status, i);
106 STATUS_TO_TEXT(SIGSTATE_A, status, i);
107 STATUS_TO_TEXT(CMD_IDX_ERR, status, i);
108 STATUS_TO_TEXT(STOPBIT_ERR, status, i);
109 STATUS_TO_TEXT(ILL_FUNC, status, i);
110 STATUS_TO_TEXT(CMD_BUSY, status, i);
111 STATUS_TO_TEXT(CMDRESPEND, status, i);
112 STATUS_TO_TEXT(DATAEND, status, i);
113 STATUS_TO_TEXT(CRCFAIL, status, i);
114 STATUS_TO_TEXT(DATATIMEOUT, status, i);
115 STATUS_TO_TEXT(CMDTIMEOUT, status, i);
116 STATUS_TO_TEXT(RXOVERFLOW, status, i);
117 STATUS_TO_TEXT(TXUNDERRUN, status, i);
118 STATUS_TO_TEXT(RXRDY, status, i);
119 STATUS_TO_TEXT(TXRQ, status, i);
120 STATUS_TO_TEXT(ILL_ACCESS, status, i);
125 #define pr_debug_status(s) do { } while (0)
128 static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
130 struct tmio_mmc_host *host = mmc_priv(mmc);
132 if (enable && !host->sdio_irq_enabled) {
133 /* Keep device active while SDIO irq is enabled */
134 pm_runtime_get_sync(mmc_dev(mmc));
135 host->sdio_irq_enabled = true;
137 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL &
138 ~TMIO_SDIO_STAT_IOIRQ;
139 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
140 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
141 } else if (!enable && host->sdio_irq_enabled) {
142 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
143 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
144 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
146 host->sdio_irq_enabled = false;
147 pm_runtime_put(mmc_dev(mmc));
151 static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
156 for (clock = host->mmc->f_min, clk = 0x80000080;
157 new_clock >= (clock<<1); clk >>= 1)
162 if (host->set_clk_div)
163 host->set_clk_div(host->pdev, (clk>>22) & 1);
165 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff);
169 static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
171 /* implicit BUG_ON(!res) */
172 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
173 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
177 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
178 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
182 static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
184 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
185 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
188 /* implicit BUG_ON(!res) */
189 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
190 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
195 static void tmio_mmc_reset(struct tmio_mmc_host *host)
197 /* FIXME - should we set stop clock reg here */
198 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
199 /* implicit BUG_ON(!res) */
200 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
201 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
203 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
204 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
205 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
209 static void tmio_mmc_reset_work(struct work_struct *work)
211 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
212 delayed_reset_work.work);
213 struct mmc_request *mrq;
216 spin_lock_irqsave(&host->lock, flags);
220 * is request already finished? Since we use a non-blocking
221 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts
222 * us, so, have to check for IS_ERR(host->mrq)
224 if (IS_ERR_OR_NULL(mrq)
225 || time_is_after_jiffies(host->last_req_ts +
226 msecs_to_jiffies(2000))) {
227 spin_unlock_irqrestore(&host->lock, flags);
231 dev_warn(&host->pdev->dev,
232 "timeout waiting for hardware interrupt (CMD%u)\n",
236 host->data->error = -ETIMEDOUT;
238 host->cmd->error = -ETIMEDOUT;
240 mrq->cmd->error = -ETIMEDOUT;
244 host->force_pio = false;
246 spin_unlock_irqrestore(&host->lock, flags);
248 tmio_mmc_reset(host);
250 /* Ready for new calls */
253 tmio_mmc_abort_dma(host);
254 mmc_request_done(host->mmc, mrq);
257 /* called with host->lock held, interrupts disabled */
258 static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
260 struct mmc_request *mrq;
263 spin_lock_irqsave(&host->lock, flags);
266 if (IS_ERR_OR_NULL(mrq)) {
267 spin_unlock_irqrestore(&host->lock, flags);
273 host->force_pio = false;
275 cancel_delayed_work(&host->delayed_reset_work);
278 spin_unlock_irqrestore(&host->lock, flags);
280 if (mrq->cmd->error || (mrq->data && mrq->data->error))
281 tmio_mmc_abort_dma(host);
283 mmc_request_done(host->mmc, mrq);
286 static void tmio_mmc_done_work(struct work_struct *work)
288 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
290 tmio_mmc_finish_request(host);
293 /* These are the bitmasks the tmio chip requires to implement the MMC response
294 * types. Note that R1 and R6 are the same in this scheme. */
295 #define APP_CMD 0x0040
296 #define RESP_NONE 0x0300
297 #define RESP_R1 0x0400
298 #define RESP_R1B 0x0500
299 #define RESP_R2 0x0600
300 #define RESP_R3 0x0700
301 #define DATA_PRESENT 0x0800
302 #define TRANSFER_READ 0x1000
303 #define TRANSFER_MULTI 0x2000
304 #define SECURITY_CMD 0x4000
306 static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
308 struct mmc_data *data = host->data;
310 u32 irq_mask = TMIO_MASK_CMD;
312 /* CMD12 is handled by hardware */
313 if (cmd->opcode == MMC_STOP_TRANSMISSION && !cmd->arg) {
314 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
318 switch (mmc_resp_type(cmd)) {
319 case MMC_RSP_NONE: c |= RESP_NONE; break;
320 case MMC_RSP_R1: c |= RESP_R1; break;
321 case MMC_RSP_R1B: c |= RESP_R1B; break;
322 case MMC_RSP_R2: c |= RESP_R2; break;
323 case MMC_RSP_R3: c |= RESP_R3; break;
325 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
331 /* FIXME - this seems to be ok commented out but the spec suggest this bit
332 * should be set when issuing app commands.
333 * if(cmd->flags & MMC_FLAG_ACMD)
338 if (data->blocks > 1) {
339 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
342 if (data->flags & MMC_DATA_READ)
346 if (!host->native_hotplug)
347 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
348 tmio_mmc_enable_mmc_irqs(host, irq_mask);
350 /* Fire off the command */
351 sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
352 sd_ctrl_write16(host, CTL_SD_CMD, c);
358 * This chip always returns (at least?) as much data as you ask for.
359 * I'm unsure what happens if you ask for less than a block. This should be
360 * looked into to ensure that a funny length read doesn't hose the controller.
362 static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
364 struct mmc_data *data = host->data;
370 if ((host->chan_tx || host->chan_rx) && !host->force_pio) {
371 pr_err("PIO IRQ in DMA mode!\n");
374 pr_debug("Spurious PIO IRQ\n");
378 sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
379 buf = (unsigned short *)(sg_virt + host->sg_off);
381 count = host->sg_ptr->length - host->sg_off;
382 if (count > data->blksz)
385 pr_debug("count: %08x offset: %08x flags %08x\n",
386 count, host->sg_off, data->flags);
388 /* Transfer the data */
389 if (data->flags & MMC_DATA_READ)
390 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
392 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
394 host->sg_off += count;
396 tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
398 if (host->sg_off == host->sg_ptr->length)
399 tmio_mmc_next_sg(host);
404 static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
406 if (host->sg_ptr == &host->bounce_sg) {
408 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
409 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
410 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
414 /* needs to be called with host->lock held */
415 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
417 struct mmc_data *data = host->data;
418 struct mmc_command *stop;
423 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
428 /* FIXME - return correct transfer count on errors */
430 data->bytes_xfered = data->blocks * data->blksz;
432 data->bytes_xfered = 0;
434 pr_debug("Completed data request\n");
437 * FIXME: other drivers allow an optional stop command of any given type
438 * which we dont do, as the chip can auto generate them.
439 * Perhaps we can be smarter about when to use auto CMD12 and
440 * only issue the auto request when we know this is the desired
441 * stop command, allowing fallback to the stop command the
442 * upper layers expect. For now, we do what works.
445 if (data->flags & MMC_DATA_READ) {
446 if (host->chan_rx && !host->force_pio)
447 tmio_mmc_check_bounce_buffer(host);
448 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
451 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
456 if (stop->opcode == MMC_STOP_TRANSMISSION && !stop->arg)
457 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
462 schedule_work(&host->done);
465 static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
467 struct mmc_data *data;
468 spin_lock(&host->lock);
474 if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) {
476 * Has all data been written out yet? Testing on SuperH showed,
477 * that in most cases the first interrupt comes already with the
478 * BUSY status bit clear, but on some operations, like mount or
479 * in the beginning of a write / sync / umount, there is one
480 * DATAEND interrupt with the BUSY bit set, in this cases
481 * waiting for one more interrupt fixes the problem.
483 if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) {
484 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
485 tasklet_schedule(&host->dma_complete);
487 } else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) {
488 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
489 tasklet_schedule(&host->dma_complete);
491 tmio_mmc_do_data_irq(host);
492 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
495 spin_unlock(&host->lock);
498 static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
501 struct mmc_command *cmd = host->cmd;
504 spin_lock(&host->lock);
507 pr_debug("Spurious CMD irq\n");
513 /* This controller is sicker than the PXA one. Not only do we need to
514 * drop the top 8 bits of the first response word, we also need to
515 * modify the order of the response for short response command types.
518 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
519 cmd->resp[i] = sd_ctrl_read32(host, addr);
521 if (cmd->flags & MMC_RSP_136) {
522 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
523 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
524 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
526 } else if (cmd->flags & MMC_RSP_R3) {
527 cmd->resp[0] = cmd->resp[3];
530 if (stat & TMIO_STAT_CMDTIMEOUT)
531 cmd->error = -ETIMEDOUT;
532 else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC)
533 cmd->error = -EILSEQ;
535 /* If there is data to handle we enable data IRQs here, and
536 * we will ultimatley finish the request in the data_end handler.
537 * If theres no data or we encountered an error, finish now.
539 if (host->data && !cmd->error) {
540 if (host->data->flags & MMC_DATA_READ) {
541 if (host->force_pio || !host->chan_rx)
542 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
544 tasklet_schedule(&host->dma_issue);
546 if (host->force_pio || !host->chan_tx)
547 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
549 tasklet_schedule(&host->dma_issue);
552 schedule_work(&host->done);
556 spin_unlock(&host->lock);
559 static void tmio_mmc_card_irq_status(struct tmio_mmc_host *host,
560 int *ireg, int *status)
562 *status = sd_ctrl_read32(host, CTL_STATUS);
563 *ireg = *status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
565 pr_debug_status(*status);
566 pr_debug_status(*ireg);
569 static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
570 int ireg, int status)
572 struct mmc_host *mmc = host->mmc;
574 /* Card insert / remove attempts */
575 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
576 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
577 TMIO_STAT_CARD_REMOVE);
578 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
579 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
580 !work_pending(&mmc->detect.work))
581 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
588 irqreturn_t tmio_mmc_card_detect_irq(int irq, void *devid)
590 unsigned int ireg, status;
591 struct tmio_mmc_host *host = devid;
593 tmio_mmc_card_irq_status(host, &ireg, &status);
594 __tmio_mmc_card_detect_irq(host, ireg, status);
598 EXPORT_SYMBOL(tmio_mmc_card_detect_irq);
600 static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host,
601 int ireg, int status)
603 /* Command completion */
604 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
605 tmio_mmc_ack_mmc_irqs(host,
606 TMIO_STAT_CMDRESPEND |
607 TMIO_STAT_CMDTIMEOUT);
608 tmio_mmc_cmd_irq(host, status);
613 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
614 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
615 tmio_mmc_pio_irq(host);
619 /* Data transfer completion */
620 if (ireg & TMIO_STAT_DATAEND) {
621 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
622 tmio_mmc_data_irq(host);
629 irqreturn_t tmio_mmc_sdcard_irq(int irq, void *devid)
631 unsigned int ireg, status;
632 struct tmio_mmc_host *host = devid;
634 tmio_mmc_card_irq_status(host, &ireg, &status);
635 __tmio_mmc_sdcard_irq(host, ireg, status);
639 EXPORT_SYMBOL(tmio_mmc_sdcard_irq);
641 irqreturn_t tmio_mmc_sdio_irq(int irq, void *devid)
643 struct tmio_mmc_host *host = devid;
644 struct mmc_host *mmc = host->mmc;
645 struct tmio_mmc_data *pdata = host->pdata;
646 unsigned int ireg, status;
648 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
651 status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
652 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdcard_irq_mask;
654 sd_ctrl_write16(host, CTL_SDIO_STATUS, status & ~TMIO_SDIO_MASK_ALL);
656 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
657 mmc_signal_sdio_irq(mmc);
661 EXPORT_SYMBOL(tmio_mmc_sdio_irq);
663 irqreturn_t tmio_mmc_irq(int irq, void *devid)
665 struct tmio_mmc_host *host = devid;
666 unsigned int ireg, status;
668 pr_debug("MMC IRQ begin\n");
670 tmio_mmc_card_irq_status(host, &ireg, &status);
671 if (__tmio_mmc_card_detect_irq(host, ireg, status))
673 if (__tmio_mmc_sdcard_irq(host, ireg, status))
676 tmio_mmc_sdio_irq(irq, devid);
680 EXPORT_SYMBOL(tmio_mmc_irq);
682 static int tmio_mmc_start_data(struct tmio_mmc_host *host,
683 struct mmc_data *data)
685 struct tmio_mmc_data *pdata = host->pdata;
687 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
688 data->blksz, data->blocks);
690 /* Some hardware cannot perform 2 byte requests in 4 bit mode */
691 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
692 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
694 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
695 pr_err("%s: %d byte block unsupported in 4 bit mode\n",
696 mmc_hostname(host->mmc), data->blksz);
701 tmio_mmc_init_sg(host, data);
704 /* Set transfer length / blocksize */
705 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
706 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
708 tmio_mmc_start_dma(host, data);
713 /* Process requests from the MMC layer */
714 static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
716 struct tmio_mmc_host *host = mmc_priv(mmc);
720 spin_lock_irqsave(&host->lock, flags);
723 pr_debug("request not null\n");
724 if (IS_ERR(host->mrq)) {
725 spin_unlock_irqrestore(&host->lock, flags);
726 mrq->cmd->error = -EAGAIN;
727 mmc_request_done(mmc, mrq);
732 host->last_req_ts = jiffies;
736 spin_unlock_irqrestore(&host->lock, flags);
739 ret = tmio_mmc_start_data(host, mrq->data);
744 ret = tmio_mmc_start_command(host, mrq->cmd);
746 schedule_delayed_work(&host->delayed_reset_work,
747 msecs_to_jiffies(2000));
752 host->force_pio = false;
754 mrq->cmd->error = ret;
755 mmc_request_done(mmc, mrq);
758 static int tmio_mmc_clk_update(struct mmc_host *mmc)
760 struct tmio_mmc_host *host = mmc_priv(mmc);
761 struct tmio_mmc_data *pdata = host->pdata;
764 if (!pdata->clk_enable)
767 ret = pdata->clk_enable(host->pdev, &mmc->f_max);
769 mmc->f_min = mmc->f_max / 512;
774 static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd)
776 struct mmc_host *mmc = host->mmc;
779 /* .set_ios() is returning void, so, no chance to report an error */
782 host->set_pwr(host->pdev, 1);
784 if (!IS_ERR(mmc->supply.vmmc)) {
785 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
787 * Attention: empiric value. With a b43 WiFi SDIO card this
788 * delay proved necessary for reliable card-insertion probing.
789 * 100us were not enough. Is this the same 140us delay, as in
790 * tmio_mmc_set_ios()?
795 * It seems, VccQ should be switched on after Vcc, this is also what the
796 * omap_hsmmc.c driver does.
798 if (!IS_ERR(mmc->supply.vqmmc) && !ret) {
799 ret = regulator_enable(mmc->supply.vqmmc);
804 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n",
808 static void tmio_mmc_power_off(struct tmio_mmc_host *host)
810 struct mmc_host *mmc = host->mmc;
812 if (!IS_ERR(mmc->supply.vqmmc))
813 regulator_disable(mmc->supply.vqmmc);
815 if (!IS_ERR(mmc->supply.vmmc))
816 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
819 host->set_pwr(host->pdev, 0);
822 /* Set MMC clock / power.
823 * Note: This controller uses a simple divider scheme therefore it cannot
824 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
825 * MMC wont run that fast, it has to be clocked at 12MHz which is the next
828 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
830 struct tmio_mmc_host *host = mmc_priv(mmc);
831 struct device *dev = &host->pdev->dev;
834 mutex_lock(&host->ios_lock);
836 spin_lock_irqsave(&host->lock, flags);
838 if (IS_ERR(host->mrq)) {
840 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
841 current->comm, task_pid_nr(current),
842 ios->clock, ios->power_mode);
843 host->mrq = ERR_PTR(-EINTR);
846 "%s.%d: CMD%u active since %lu, now %lu!\n",
847 current->comm, task_pid_nr(current),
848 host->mrq->cmd->opcode, host->last_req_ts, jiffies);
850 spin_unlock_irqrestore(&host->lock, flags);
852 mutex_unlock(&host->ios_lock);
856 host->mrq = ERR_PTR(-EBUSY);
858 spin_unlock_irqrestore(&host->lock, flags);
861 * host->power toggles between false and true in both cases - either
862 * or not the controller can be runtime-suspended during inactivity.
863 * But if the controller has to be kept on, the runtime-pm usage_count
864 * is kept positive, so no suspending actually takes place.
866 if (ios->power_mode == MMC_POWER_ON && ios->clock) {
867 if (host->power != TMIO_MMC_ON_RUN) {
868 tmio_mmc_clk_update(mmc);
869 pm_runtime_get_sync(dev);
870 if (host->resuming) {
871 tmio_mmc_reset(host);
872 host->resuming = false;
875 if (host->power == TMIO_MMC_OFF_STOP)
876 tmio_mmc_reset(host);
877 tmio_mmc_set_clock(host, ios->clock);
878 if (host->power == TMIO_MMC_OFF_STOP)
879 /* power up SD card and the bus */
880 tmio_mmc_power_on(host, ios->vdd);
881 host->power = TMIO_MMC_ON_RUN;
882 /* start bus clock */
883 tmio_mmc_clk_start(host);
884 } else if (ios->power_mode != MMC_POWER_UP) {
885 struct tmio_mmc_data *pdata = host->pdata;
886 unsigned int old_power = host->power;
888 if (old_power != TMIO_MMC_OFF_STOP) {
889 if (ios->power_mode == MMC_POWER_OFF) {
890 tmio_mmc_power_off(host);
891 host->power = TMIO_MMC_OFF_STOP;
893 host->power = TMIO_MMC_ON_STOP;
897 if (old_power == TMIO_MMC_ON_RUN) {
898 tmio_mmc_clk_stop(host);
900 if (pdata->clk_disable)
901 pdata->clk_disable(host->pdev);
905 if (host->power != TMIO_MMC_OFF_STOP) {
906 switch (ios->bus_width) {
907 case MMC_BUS_WIDTH_1:
908 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
910 case MMC_BUS_WIDTH_4:
911 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
916 /* Let things settle. delay taken from winCE driver */
918 if (PTR_ERR(host->mrq) == -EINTR)
919 dev_dbg(&host->pdev->dev,
920 "%s.%d: IOS interrupted: clk %u, mode %u",
921 current->comm, task_pid_nr(current),
922 ios->clock, ios->power_mode);
925 mutex_unlock(&host->ios_lock);
928 static int tmio_mmc_get_ro(struct mmc_host *mmc)
930 struct tmio_mmc_host *host = mmc_priv(mmc);
931 struct tmio_mmc_data *pdata = host->pdata;
932 int ret = mmc_gpio_get_ro(mmc);
936 return !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
937 (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
940 static const struct mmc_host_ops tmio_mmc_ops = {
941 .request = tmio_mmc_request,
942 .set_ios = tmio_mmc_set_ios,
943 .get_ro = tmio_mmc_get_ro,
944 .get_cd = mmc_gpio_get_cd,
945 .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
948 static int tmio_mmc_init_ocr(struct tmio_mmc_host *host)
950 struct tmio_mmc_data *pdata = host->pdata;
951 struct mmc_host *mmc = host->mmc;
953 mmc_regulator_get_supply(mmc);
955 /* use ocr_mask if no regulator */
957 mmc->ocr_avail = pdata->ocr_mask;
961 * There is possibility that regulator has not been probed
964 return -EPROBE_DEFER;
969 static void tmio_mmc_of_parse(struct platform_device *pdev,
970 struct tmio_mmc_data *pdata)
972 const struct device_node *np = pdev->dev.of_node;
976 if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL))
977 pdata->flags |= TMIO_MMC_WRPROTECT_DISABLE;
980 int tmio_mmc_host_probe(struct tmio_mmc_host **host,
981 struct platform_device *pdev,
982 struct tmio_mmc_data *pdata)
984 struct tmio_mmc_host *_host;
985 struct mmc_host *mmc;
986 struct resource *res_ctl;
988 u32 irq_mask = TMIO_MASK_CMD;
990 tmio_mmc_of_parse(pdev, pdata);
992 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
993 pdata->write16_hook = NULL;
995 res_ctl = platform_get_resource(pdev, IORESOURCE_MEM, 0);
999 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
1003 ret = mmc_of_parse(mmc);
1007 pdata->dev = &pdev->dev;
1008 _host = mmc_priv(mmc);
1009 _host->pdata = pdata;
1012 platform_set_drvdata(pdev, mmc);
1014 _host->set_pwr = pdata->set_pwr;
1015 _host->set_clk_div = pdata->set_clk_div;
1017 ret = tmio_mmc_init_ocr(_host);
1021 _host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
1027 mmc->ops = &tmio_mmc_ops;
1028 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
1029 mmc->caps2 |= pdata->capabilities2;
1031 mmc->max_blk_size = 512;
1032 mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
1034 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1035 mmc->max_seg_size = mmc->max_req_size;
1037 _host->native_hotplug = !(pdata->flags & TMIO_MMC_USE_GPIO_CD ||
1038 mmc->caps & MMC_CAP_NEEDS_POLL ||
1039 mmc->caps & MMC_CAP_NONREMOVABLE ||
1040 mmc->slot.cd_irq >= 0);
1042 _host->power = TMIO_MMC_OFF_STOP;
1043 pm_runtime_enable(&pdev->dev);
1044 ret = pm_runtime_resume(&pdev->dev);
1048 if (tmio_mmc_clk_update(mmc) < 0) {
1049 mmc->f_max = pdata->hclk;
1050 mmc->f_min = mmc->f_max / 512;
1054 * There are 4 different scenarios for the card detection:
1055 * 1) an external gpio irq handles the cd (best for power savings)
1056 * 2) internal sdhi irq handles the cd
1057 * 3) a worker thread polls the sdhi - indicated by MMC_CAP_NEEDS_POLL
1058 * 4) the medium is non-removable - indicated by MMC_CAP_NONREMOVABLE
1060 * While we increment the runtime PM counter for all scenarios when
1061 * the mmc core activates us by calling an appropriate set_ios(), we
1062 * must additionally ensure that in case 2) the tmio mmc hardware stays
1063 * powered on during runtime for the card detection to work.
1065 if (_host->native_hotplug)
1066 pm_runtime_get_noresume(&pdev->dev);
1068 tmio_mmc_clk_stop(_host);
1069 tmio_mmc_reset(_host);
1071 _host->sdcard_irq_mask = sd_ctrl_read32(_host, CTL_IRQ_MASK);
1072 tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
1074 /* Unmask the IRQs we want to know about */
1075 if (!_host->chan_rx)
1076 irq_mask |= TMIO_MASK_READOP;
1077 if (!_host->chan_tx)
1078 irq_mask |= TMIO_MASK_WRITEOP;
1079 if (!_host->native_hotplug)
1080 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
1082 _host->sdcard_irq_mask &= ~irq_mask;
1084 _host->sdio_irq_enabled = false;
1085 if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
1086 _host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
1087 sd_ctrl_write16(_host, CTL_SDIO_IRQ_MASK, _host->sdio_irq_mask);
1088 sd_ctrl_write16(_host, CTL_TRANSACTION_CTL, 0x0000);
1091 spin_lock_init(&_host->lock);
1092 mutex_init(&_host->ios_lock);
1094 /* Init delayed work for request timeouts */
1095 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
1096 INIT_WORK(&_host->done, tmio_mmc_done_work);
1098 /* See if we also get DMA */
1099 tmio_mmc_request_dma(_host, pdata);
1101 ret = mmc_add_host(mmc);
1102 if (pdata->clk_disable)
1103 pdata->clk_disable(pdev);
1105 tmio_mmc_host_remove(_host);
1109 dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
1111 if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
1112 ret = mmc_gpio_request_cd(mmc, pdata->cd_gpio, 0);
1114 tmio_mmc_host_remove(_host);
1124 pm_runtime_disable(&pdev->dev);
1125 iounmap(_host->ctl);
1131 EXPORT_SYMBOL(tmio_mmc_host_probe);
1133 void tmio_mmc_host_remove(struct tmio_mmc_host *host)
1135 struct platform_device *pdev = host->pdev;
1136 struct mmc_host *mmc = host->mmc;
1138 if (!host->native_hotplug)
1139 pm_runtime_get_sync(&pdev->dev);
1141 dev_pm_qos_hide_latency_limit(&pdev->dev);
1143 mmc_remove_host(mmc);
1144 cancel_work_sync(&host->done);
1145 cancel_delayed_work_sync(&host->delayed_reset_work);
1146 tmio_mmc_release_dma(host);
1148 pm_runtime_put_sync(&pdev->dev);
1149 pm_runtime_disable(&pdev->dev);
1154 EXPORT_SYMBOL(tmio_mmc_host_remove);
1156 #ifdef CONFIG_PM_SLEEP
1157 int tmio_mmc_host_suspend(struct device *dev)
1159 struct mmc_host *mmc = dev_get_drvdata(dev);
1160 struct tmio_mmc_host *host = mmc_priv(mmc);
1162 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
1165 EXPORT_SYMBOL(tmio_mmc_host_suspend);
1167 int tmio_mmc_host_resume(struct device *dev)
1169 struct mmc_host *mmc = dev_get_drvdata(dev);
1170 struct tmio_mmc_host *host = mmc_priv(mmc);
1172 tmio_mmc_enable_dma(host, true);
1174 /* The MMC core will perform the complete set up */
1175 host->resuming = true;
1178 EXPORT_SYMBOL(tmio_mmc_host_resume);
1181 #ifdef CONFIG_PM_RUNTIME
1182 int tmio_mmc_host_runtime_suspend(struct device *dev)
1186 EXPORT_SYMBOL(tmio_mmc_host_runtime_suspend);
1188 int tmio_mmc_host_runtime_resume(struct device *dev)
1190 struct mmc_host *mmc = dev_get_drvdata(dev);
1191 struct tmio_mmc_host *host = mmc_priv(mmc);
1193 tmio_mmc_enable_dma(host, true);
1197 EXPORT_SYMBOL(tmio_mmc_host_runtime_resume);
1200 MODULE_LICENSE("GPL v2");