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);
133 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL &
134 ~TMIO_SDIO_STAT_IOIRQ;
135 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
136 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
138 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
139 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
140 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
144 static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
149 for (clock = host->mmc->f_min, clk = 0x80000080;
150 new_clock >= (clock<<1); clk >>= 1)
155 if (host->set_clk_div)
156 host->set_clk_div(host->pdev, (clk>>22) & 1);
158 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff);
162 static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
164 /* implicit BUG_ON(!res) */
165 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
166 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
170 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
171 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
175 static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
177 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
178 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
181 /* implicit BUG_ON(!res) */
182 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
183 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
188 static void tmio_mmc_reset(struct tmio_mmc_host *host)
190 /* FIXME - should we set stop clock reg here */
191 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
192 /* implicit BUG_ON(!res) */
193 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
194 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
196 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
197 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
198 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
202 static void tmio_mmc_reset_work(struct work_struct *work)
204 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
205 delayed_reset_work.work);
206 struct mmc_request *mrq;
209 spin_lock_irqsave(&host->lock, flags);
213 * is request already finished? Since we use a non-blocking
214 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts
215 * us, so, have to check for IS_ERR(host->mrq)
217 if (IS_ERR_OR_NULL(mrq)
218 || time_is_after_jiffies(host->last_req_ts +
219 msecs_to_jiffies(2000))) {
220 spin_unlock_irqrestore(&host->lock, flags);
224 dev_warn(&host->pdev->dev,
225 "timeout waiting for hardware interrupt (CMD%u)\n",
229 host->data->error = -ETIMEDOUT;
231 host->cmd->error = -ETIMEDOUT;
233 mrq->cmd->error = -ETIMEDOUT;
237 host->force_pio = false;
239 spin_unlock_irqrestore(&host->lock, flags);
241 tmio_mmc_reset(host);
243 /* Ready for new calls */
246 tmio_mmc_abort_dma(host);
247 mmc_request_done(host->mmc, mrq);
250 /* called with host->lock held, interrupts disabled */
251 static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
253 struct mmc_request *mrq;
256 spin_lock_irqsave(&host->lock, flags);
259 if (IS_ERR_OR_NULL(mrq)) {
260 spin_unlock_irqrestore(&host->lock, flags);
266 host->force_pio = false;
268 cancel_delayed_work(&host->delayed_reset_work);
271 spin_unlock_irqrestore(&host->lock, flags);
273 if (mrq->cmd->error || (mrq->data && mrq->data->error))
274 tmio_mmc_abort_dma(host);
276 mmc_request_done(host->mmc, mrq);
279 static void tmio_mmc_done_work(struct work_struct *work)
281 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
283 tmio_mmc_finish_request(host);
286 /* These are the bitmasks the tmio chip requires to implement the MMC response
287 * types. Note that R1 and R6 are the same in this scheme. */
288 #define APP_CMD 0x0040
289 #define RESP_NONE 0x0300
290 #define RESP_R1 0x0400
291 #define RESP_R1B 0x0500
292 #define RESP_R2 0x0600
293 #define RESP_R3 0x0700
294 #define DATA_PRESENT 0x0800
295 #define TRANSFER_READ 0x1000
296 #define TRANSFER_MULTI 0x2000
297 #define SECURITY_CMD 0x4000
299 static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
301 struct mmc_data *data = host->data;
303 u32 irq_mask = TMIO_MASK_CMD;
305 /* CMD12 is handled by hardware */
306 if (cmd->opcode == MMC_STOP_TRANSMISSION && !cmd->arg) {
307 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
311 switch (mmc_resp_type(cmd)) {
312 case MMC_RSP_NONE: c |= RESP_NONE; break;
313 case MMC_RSP_R1: c |= RESP_R1; break;
314 case MMC_RSP_R1B: c |= RESP_R1B; break;
315 case MMC_RSP_R2: c |= RESP_R2; break;
316 case MMC_RSP_R3: c |= RESP_R3; break;
318 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
324 /* FIXME - this seems to be ok commented out but the spec suggest this bit
325 * should be set when issuing app commands.
326 * if(cmd->flags & MMC_FLAG_ACMD)
331 if (data->blocks > 1) {
332 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
335 if (data->flags & MMC_DATA_READ)
339 if (!host->native_hotplug)
340 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
341 tmio_mmc_enable_mmc_irqs(host, irq_mask);
343 /* Fire off the command */
344 sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
345 sd_ctrl_write16(host, CTL_SD_CMD, c);
351 * This chip always returns (at least?) as much data as you ask for.
352 * I'm unsure what happens if you ask for less than a block. This should be
353 * looked into to ensure that a funny length read doesn't hose the controller.
355 static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
357 struct mmc_data *data = host->data;
363 if ((host->chan_tx || host->chan_rx) && !host->force_pio) {
364 pr_err("PIO IRQ in DMA mode!\n");
367 pr_debug("Spurious PIO IRQ\n");
371 sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
372 buf = (unsigned short *)(sg_virt + host->sg_off);
374 count = host->sg_ptr->length - host->sg_off;
375 if (count > data->blksz)
378 pr_debug("count: %08x offset: %08x flags %08x\n",
379 count, host->sg_off, data->flags);
381 /* Transfer the data */
382 if (data->flags & MMC_DATA_READ)
383 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
385 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
387 host->sg_off += count;
389 tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
391 if (host->sg_off == host->sg_ptr->length)
392 tmio_mmc_next_sg(host);
397 static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
399 if (host->sg_ptr == &host->bounce_sg) {
401 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
402 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
403 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
407 /* needs to be called with host->lock held */
408 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
410 struct mmc_data *data = host->data;
411 struct mmc_command *stop;
416 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
421 /* FIXME - return correct transfer count on errors */
423 data->bytes_xfered = data->blocks * data->blksz;
425 data->bytes_xfered = 0;
427 pr_debug("Completed data request\n");
430 * FIXME: other drivers allow an optional stop command of any given type
431 * which we dont do, as the chip can auto generate them.
432 * Perhaps we can be smarter about when to use auto CMD12 and
433 * only issue the auto request when we know this is the desired
434 * stop command, allowing fallback to the stop command the
435 * upper layers expect. For now, we do what works.
438 if (data->flags & MMC_DATA_READ) {
439 if (host->chan_rx && !host->force_pio)
440 tmio_mmc_check_bounce_buffer(host);
441 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
444 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
449 if (stop->opcode == MMC_STOP_TRANSMISSION && !stop->arg)
450 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
455 schedule_work(&host->done);
458 static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
460 struct mmc_data *data;
461 spin_lock(&host->lock);
467 if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) {
469 * Has all data been written out yet? Testing on SuperH showed,
470 * that in most cases the first interrupt comes already with the
471 * BUSY status bit clear, but on some operations, like mount or
472 * in the beginning of a write / sync / umount, there is one
473 * DATAEND interrupt with the BUSY bit set, in this cases
474 * waiting for one more interrupt fixes the problem.
476 if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) {
477 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
478 tasklet_schedule(&host->dma_complete);
480 } else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) {
481 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
482 tasklet_schedule(&host->dma_complete);
484 tmio_mmc_do_data_irq(host);
485 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
488 spin_unlock(&host->lock);
491 static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
494 struct mmc_command *cmd = host->cmd;
497 spin_lock(&host->lock);
500 pr_debug("Spurious CMD irq\n");
506 /* This controller is sicker than the PXA one. Not only do we need to
507 * drop the top 8 bits of the first response word, we also need to
508 * modify the order of the response for short response command types.
511 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
512 cmd->resp[i] = sd_ctrl_read32(host, addr);
514 if (cmd->flags & MMC_RSP_136) {
515 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
516 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
517 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
519 } else if (cmd->flags & MMC_RSP_R3) {
520 cmd->resp[0] = cmd->resp[3];
523 if (stat & TMIO_STAT_CMDTIMEOUT)
524 cmd->error = -ETIMEDOUT;
525 else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC)
526 cmd->error = -EILSEQ;
528 /* If there is data to handle we enable data IRQs here, and
529 * we will ultimatley finish the request in the data_end handler.
530 * If theres no data or we encountered an error, finish now.
532 if (host->data && !cmd->error) {
533 if (host->data->flags & MMC_DATA_READ) {
534 if (host->force_pio || !host->chan_rx)
535 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
537 tasklet_schedule(&host->dma_issue);
539 if (host->force_pio || !host->chan_tx)
540 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
542 tasklet_schedule(&host->dma_issue);
545 schedule_work(&host->done);
549 spin_unlock(&host->lock);
552 static void tmio_mmc_card_irq_status(struct tmio_mmc_host *host,
553 int *ireg, int *status)
555 *status = sd_ctrl_read32(host, CTL_STATUS);
556 *ireg = *status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
558 pr_debug_status(*status);
559 pr_debug_status(*ireg);
562 static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
563 int ireg, int status)
565 struct mmc_host *mmc = host->mmc;
567 /* Card insert / remove attempts */
568 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
569 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
570 TMIO_STAT_CARD_REMOVE);
571 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
572 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
573 !work_pending(&mmc->detect.work))
574 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
581 irqreturn_t tmio_mmc_card_detect_irq(int irq, void *devid)
583 unsigned int ireg, status;
584 struct tmio_mmc_host *host = devid;
586 tmio_mmc_card_irq_status(host, &ireg, &status);
587 __tmio_mmc_card_detect_irq(host, ireg, status);
591 EXPORT_SYMBOL(tmio_mmc_card_detect_irq);
593 static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host,
594 int ireg, int status)
596 /* Command completion */
597 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
598 tmio_mmc_ack_mmc_irqs(host,
599 TMIO_STAT_CMDRESPEND |
600 TMIO_STAT_CMDTIMEOUT);
601 tmio_mmc_cmd_irq(host, status);
606 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
607 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
608 tmio_mmc_pio_irq(host);
612 /* Data transfer completion */
613 if (ireg & TMIO_STAT_DATAEND) {
614 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
615 tmio_mmc_data_irq(host);
622 irqreturn_t tmio_mmc_sdcard_irq(int irq, void *devid)
624 unsigned int ireg, status;
625 struct tmio_mmc_host *host = devid;
627 tmio_mmc_card_irq_status(host, &ireg, &status);
628 __tmio_mmc_sdcard_irq(host, ireg, status);
632 EXPORT_SYMBOL(tmio_mmc_sdcard_irq);
634 irqreturn_t tmio_mmc_sdio_irq(int irq, void *devid)
636 struct tmio_mmc_host *host = devid;
637 struct mmc_host *mmc = host->mmc;
638 struct tmio_mmc_data *pdata = host->pdata;
639 unsigned int ireg, status;
641 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
644 status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
645 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdcard_irq_mask;
647 sd_ctrl_write16(host, CTL_SDIO_STATUS, status & ~TMIO_SDIO_MASK_ALL);
649 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
650 mmc_signal_sdio_irq(mmc);
654 EXPORT_SYMBOL(tmio_mmc_sdio_irq);
656 irqreturn_t tmio_mmc_irq(int irq, void *devid)
658 struct tmio_mmc_host *host = devid;
659 unsigned int ireg, status;
661 pr_debug("MMC IRQ begin\n");
663 tmio_mmc_card_irq_status(host, &ireg, &status);
664 if (__tmio_mmc_card_detect_irq(host, ireg, status))
666 if (__tmio_mmc_sdcard_irq(host, ireg, status))
669 tmio_mmc_sdio_irq(irq, devid);
673 EXPORT_SYMBOL(tmio_mmc_irq);
675 static int tmio_mmc_start_data(struct tmio_mmc_host *host,
676 struct mmc_data *data)
678 struct tmio_mmc_data *pdata = host->pdata;
680 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
681 data->blksz, data->blocks);
683 /* Some hardware cannot perform 2 byte requests in 4 bit mode */
684 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
685 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
687 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
688 pr_err("%s: %d byte block unsupported in 4 bit mode\n",
689 mmc_hostname(host->mmc), data->blksz);
694 tmio_mmc_init_sg(host, data);
697 /* Set transfer length / blocksize */
698 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
699 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
701 tmio_mmc_start_dma(host, data);
706 /* Process requests from the MMC layer */
707 static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
709 struct tmio_mmc_host *host = mmc_priv(mmc);
713 spin_lock_irqsave(&host->lock, flags);
716 pr_debug("request not null\n");
717 if (IS_ERR(host->mrq)) {
718 spin_unlock_irqrestore(&host->lock, flags);
719 mrq->cmd->error = -EAGAIN;
720 mmc_request_done(mmc, mrq);
725 host->last_req_ts = jiffies;
729 spin_unlock_irqrestore(&host->lock, flags);
732 ret = tmio_mmc_start_data(host, mrq->data);
737 ret = tmio_mmc_start_command(host, mrq->cmd);
739 schedule_delayed_work(&host->delayed_reset_work,
740 msecs_to_jiffies(2000));
745 host->force_pio = false;
747 mrq->cmd->error = ret;
748 mmc_request_done(mmc, mrq);
751 static int tmio_mmc_clk_update(struct mmc_host *mmc)
753 struct tmio_mmc_host *host = mmc_priv(mmc);
754 struct tmio_mmc_data *pdata = host->pdata;
757 if (!pdata->clk_enable)
760 ret = pdata->clk_enable(host->pdev, &mmc->f_max);
762 mmc->f_min = mmc->f_max / 512;
767 static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd)
769 struct mmc_host *mmc = host->mmc;
772 /* .set_ios() is returning void, so, no chance to report an error */
775 host->set_pwr(host->pdev, 1);
777 if (!IS_ERR(mmc->supply.vmmc)) {
778 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
780 * Attention: empiric value. With a b43 WiFi SDIO card this
781 * delay proved necessary for reliable card-insertion probing.
782 * 100us were not enough. Is this the same 140us delay, as in
783 * tmio_mmc_set_ios()?
788 * It seems, VccQ should be switched on after Vcc, this is also what the
789 * omap_hsmmc.c driver does.
791 if (!IS_ERR(mmc->supply.vqmmc) && !ret) {
792 ret = regulator_enable(mmc->supply.vqmmc);
797 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n",
801 static void tmio_mmc_power_off(struct tmio_mmc_host *host)
803 struct mmc_host *mmc = host->mmc;
805 if (!IS_ERR(mmc->supply.vqmmc))
806 regulator_disable(mmc->supply.vqmmc);
808 if (!IS_ERR(mmc->supply.vmmc))
809 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
812 host->set_pwr(host->pdev, 0);
815 /* Set MMC clock / power.
816 * Note: This controller uses a simple divider scheme therefore it cannot
817 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
818 * MMC wont run that fast, it has to be clocked at 12MHz which is the next
821 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
823 struct tmio_mmc_host *host = mmc_priv(mmc);
824 struct device *dev = &host->pdev->dev;
827 mutex_lock(&host->ios_lock);
829 spin_lock_irqsave(&host->lock, flags);
831 if (IS_ERR(host->mrq)) {
833 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
834 current->comm, task_pid_nr(current),
835 ios->clock, ios->power_mode);
836 host->mrq = ERR_PTR(-EINTR);
839 "%s.%d: CMD%u active since %lu, now %lu!\n",
840 current->comm, task_pid_nr(current),
841 host->mrq->cmd->opcode, host->last_req_ts, jiffies);
843 spin_unlock_irqrestore(&host->lock, flags);
845 mutex_unlock(&host->ios_lock);
849 host->mrq = ERR_PTR(-EBUSY);
851 spin_unlock_irqrestore(&host->lock, flags);
854 * host->power toggles between false and true in both cases - either
855 * or not the controller can be runtime-suspended during inactivity.
856 * But if the controller has to be kept on, the runtime-pm usage_count
857 * is kept positive, so no suspending actually takes place.
859 if (ios->power_mode == MMC_POWER_ON && ios->clock) {
860 if (host->power != TMIO_MMC_ON_RUN) {
861 tmio_mmc_clk_update(mmc);
862 pm_runtime_get_sync(dev);
863 if (host->resuming) {
864 tmio_mmc_reset(host);
865 host->resuming = false;
868 if (host->power == TMIO_MMC_OFF_STOP)
869 tmio_mmc_reset(host);
870 tmio_mmc_set_clock(host, ios->clock);
871 if (host->power == TMIO_MMC_OFF_STOP)
872 /* power up SD card and the bus */
873 tmio_mmc_power_on(host, ios->vdd);
874 host->power = TMIO_MMC_ON_RUN;
875 /* start bus clock */
876 tmio_mmc_clk_start(host);
877 } else if (ios->power_mode != MMC_POWER_UP) {
878 struct tmio_mmc_data *pdata = host->pdata;
879 unsigned int old_power = host->power;
881 if (old_power != TMIO_MMC_OFF_STOP) {
882 if (ios->power_mode == MMC_POWER_OFF) {
883 tmio_mmc_power_off(host);
884 host->power = TMIO_MMC_OFF_STOP;
886 host->power = TMIO_MMC_ON_STOP;
890 if (old_power == TMIO_MMC_ON_RUN) {
891 tmio_mmc_clk_stop(host);
893 if (pdata->clk_disable)
894 pdata->clk_disable(host->pdev);
898 if (host->power != TMIO_MMC_OFF_STOP) {
899 switch (ios->bus_width) {
900 case MMC_BUS_WIDTH_1:
901 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
903 case MMC_BUS_WIDTH_4:
904 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
909 /* Let things settle. delay taken from winCE driver */
911 if (PTR_ERR(host->mrq) == -EINTR)
912 dev_dbg(&host->pdev->dev,
913 "%s.%d: IOS interrupted: clk %u, mode %u",
914 current->comm, task_pid_nr(current),
915 ios->clock, ios->power_mode);
918 mutex_unlock(&host->ios_lock);
921 static int tmio_mmc_get_ro(struct mmc_host *mmc)
923 struct tmio_mmc_host *host = mmc_priv(mmc);
924 struct tmio_mmc_data *pdata = host->pdata;
925 int ret = mmc_gpio_get_ro(mmc);
929 return !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
930 (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
933 static const struct mmc_host_ops tmio_mmc_ops = {
934 .request = tmio_mmc_request,
935 .set_ios = tmio_mmc_set_ios,
936 .get_ro = tmio_mmc_get_ro,
937 .get_cd = mmc_gpio_get_cd,
938 .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
941 static int tmio_mmc_init_ocr(struct tmio_mmc_host *host)
943 struct tmio_mmc_data *pdata = host->pdata;
944 struct mmc_host *mmc = host->mmc;
946 mmc_regulator_get_supply(mmc);
948 /* use ocr_mask if no regulator */
950 mmc->ocr_avail = pdata->ocr_mask;
954 * There is possibility that regulator has not been probed
957 return -EPROBE_DEFER;
962 static void tmio_mmc_of_parse(struct platform_device *pdev,
963 struct tmio_mmc_data *pdata)
965 const struct device_node *np = pdev->dev.of_node;
969 if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL))
970 pdata->flags |= TMIO_MMC_WRPROTECT_DISABLE;
973 int tmio_mmc_host_probe(struct tmio_mmc_host **host,
974 struct platform_device *pdev,
975 struct tmio_mmc_data *pdata)
977 struct tmio_mmc_host *_host;
978 struct mmc_host *mmc;
979 struct resource *res_ctl;
981 u32 irq_mask = TMIO_MASK_CMD;
983 tmio_mmc_of_parse(pdev, pdata);
985 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
986 pdata->write16_hook = NULL;
988 res_ctl = platform_get_resource(pdev, IORESOURCE_MEM, 0);
992 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
996 ret = mmc_of_parse(mmc);
1000 pdata->dev = &pdev->dev;
1001 _host = mmc_priv(mmc);
1002 _host->pdata = pdata;
1005 platform_set_drvdata(pdev, mmc);
1007 _host->set_pwr = pdata->set_pwr;
1008 _host->set_clk_div = pdata->set_clk_div;
1010 ret = tmio_mmc_init_ocr(_host);
1014 _host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
1020 mmc->ops = &tmio_mmc_ops;
1021 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
1022 mmc->caps2 |= pdata->capabilities2;
1024 mmc->max_blk_size = 512;
1025 mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
1027 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1028 mmc->max_seg_size = mmc->max_req_size;
1030 _host->native_hotplug = !(pdata->flags & TMIO_MMC_USE_GPIO_CD ||
1031 mmc->caps & MMC_CAP_NEEDS_POLL ||
1032 mmc->caps & MMC_CAP_NONREMOVABLE ||
1033 mmc->slot.cd_irq >= 0);
1035 _host->power = TMIO_MMC_OFF_STOP;
1036 pm_runtime_enable(&pdev->dev);
1037 ret = pm_runtime_resume(&pdev->dev);
1041 if (tmio_mmc_clk_update(mmc) < 0) {
1042 mmc->f_max = pdata->hclk;
1043 mmc->f_min = mmc->f_max / 512;
1047 * There are 4 different scenarios for the card detection:
1048 * 1) an external gpio irq handles the cd (best for power savings)
1049 * 2) internal sdhi irq handles the cd
1050 * 3) a worker thread polls the sdhi - indicated by MMC_CAP_NEEDS_POLL
1051 * 4) the medium is non-removable - indicated by MMC_CAP_NONREMOVABLE
1053 * While we increment the runtime PM counter for all scenarios when
1054 * the mmc core activates us by calling an appropriate set_ios(), we
1055 * must additionally ensure that in case 2) the tmio mmc hardware stays
1056 * powered on during runtime for the card detection to work.
1058 if (_host->native_hotplug)
1059 pm_runtime_get_noresume(&pdev->dev);
1061 tmio_mmc_clk_stop(_host);
1062 tmio_mmc_reset(_host);
1064 _host->sdcard_irq_mask = sd_ctrl_read32(_host, CTL_IRQ_MASK);
1065 tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
1067 /* Unmask the IRQs we want to know about */
1068 if (!_host->chan_rx)
1069 irq_mask |= TMIO_MASK_READOP;
1070 if (!_host->chan_tx)
1071 irq_mask |= TMIO_MASK_WRITEOP;
1072 if (!_host->native_hotplug)
1073 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
1075 _host->sdcard_irq_mask &= ~irq_mask;
1077 if (pdata->flags & TMIO_MMC_SDIO_IRQ)
1078 tmio_mmc_enable_sdio_irq(mmc, 0);
1080 spin_lock_init(&_host->lock);
1081 mutex_init(&_host->ios_lock);
1083 /* Init delayed work for request timeouts */
1084 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
1085 INIT_WORK(&_host->done, tmio_mmc_done_work);
1087 /* See if we also get DMA */
1088 tmio_mmc_request_dma(_host, pdata);
1090 ret = mmc_add_host(mmc);
1091 if (pdata->clk_disable)
1092 pdata->clk_disable(pdev);
1094 tmio_mmc_host_remove(_host);
1098 dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
1100 if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
1101 ret = mmc_gpio_request_cd(mmc, pdata->cd_gpio, 0);
1103 tmio_mmc_host_remove(_host);
1113 pm_runtime_disable(&pdev->dev);
1114 iounmap(_host->ctl);
1120 EXPORT_SYMBOL(tmio_mmc_host_probe);
1122 void tmio_mmc_host_remove(struct tmio_mmc_host *host)
1124 struct platform_device *pdev = host->pdev;
1125 struct mmc_host *mmc = host->mmc;
1127 if (!host->native_hotplug)
1128 pm_runtime_get_sync(&pdev->dev);
1130 dev_pm_qos_hide_latency_limit(&pdev->dev);
1132 mmc_remove_host(mmc);
1133 cancel_work_sync(&host->done);
1134 cancel_delayed_work_sync(&host->delayed_reset_work);
1135 tmio_mmc_release_dma(host);
1137 pm_runtime_put_sync(&pdev->dev);
1138 pm_runtime_disable(&pdev->dev);
1143 EXPORT_SYMBOL(tmio_mmc_host_remove);
1146 int tmio_mmc_host_suspend(struct device *dev)
1148 struct mmc_host *mmc = dev_get_drvdata(dev);
1149 struct tmio_mmc_host *host = mmc_priv(mmc);
1151 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
1154 EXPORT_SYMBOL(tmio_mmc_host_suspend);
1156 int tmio_mmc_host_resume(struct device *dev)
1158 struct mmc_host *mmc = dev_get_drvdata(dev);
1159 struct tmio_mmc_host *host = mmc_priv(mmc);
1161 tmio_mmc_enable_dma(host, true);
1163 /* The MMC core will perform the complete set up */
1164 host->resuming = true;
1167 EXPORT_SYMBOL(tmio_mmc_host_resume);
1169 #endif /* CONFIG_PM */
1171 int tmio_mmc_host_runtime_suspend(struct device *dev)
1175 EXPORT_SYMBOL(tmio_mmc_host_runtime_suspend);
1177 int tmio_mmc_host_runtime_resume(struct device *dev)
1179 struct mmc_host *mmc = dev_get_drvdata(dev);
1180 struct tmio_mmc_host *host = mmc_priv(mmc);
1182 tmio_mmc_enable_dma(host, true);
1186 EXPORT_SYMBOL(tmio_mmc_host_runtime_resume);
1188 MODULE_LICENSE("GPL v2");