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 struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
166 /* implicit BUG_ON(!res) */
167 if (resource_size(res) > 0x100) {
168 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
172 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
173 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
177 static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
179 struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
181 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
182 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
185 /* implicit BUG_ON(!res) */
186 if (resource_size(res) > 0x100) {
187 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
192 static void tmio_mmc_reset(struct tmio_mmc_host *host)
194 struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
196 /* FIXME - should we set stop clock reg here */
197 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
198 /* implicit BUG_ON(!res) */
199 if (resource_size(res) > 0x100)
200 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
202 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
203 if (resource_size(res) > 0x100)
204 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
208 static void tmio_mmc_reset_work(struct work_struct *work)
210 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
211 delayed_reset_work.work);
212 struct mmc_request *mrq;
215 spin_lock_irqsave(&host->lock, flags);
219 * is request already finished? Since we use a non-blocking
220 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts
221 * us, so, have to check for IS_ERR(host->mrq)
223 if (IS_ERR_OR_NULL(mrq)
224 || time_is_after_jiffies(host->last_req_ts +
225 msecs_to_jiffies(2000))) {
226 spin_unlock_irqrestore(&host->lock, flags);
230 dev_warn(&host->pdev->dev,
231 "timeout waiting for hardware interrupt (CMD%u)\n",
235 host->data->error = -ETIMEDOUT;
237 host->cmd->error = -ETIMEDOUT;
239 mrq->cmd->error = -ETIMEDOUT;
243 host->force_pio = false;
245 spin_unlock_irqrestore(&host->lock, flags);
247 tmio_mmc_reset(host);
249 /* Ready for new calls */
252 tmio_mmc_abort_dma(host);
253 mmc_request_done(host->mmc, mrq);
256 /* called with host->lock held, interrupts disabled */
257 static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
259 struct mmc_request *mrq;
262 spin_lock_irqsave(&host->lock, flags);
265 if (IS_ERR_OR_NULL(mrq)) {
266 spin_unlock_irqrestore(&host->lock, flags);
272 host->force_pio = false;
274 cancel_delayed_work(&host->delayed_reset_work);
277 spin_unlock_irqrestore(&host->lock, flags);
279 if (mrq->cmd->error || (mrq->data && mrq->data->error))
280 tmio_mmc_abort_dma(host);
282 mmc_request_done(host->mmc, mrq);
285 static void tmio_mmc_done_work(struct work_struct *work)
287 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
289 tmio_mmc_finish_request(host);
292 /* These are the bitmasks the tmio chip requires to implement the MMC response
293 * types. Note that R1 and R6 are the same in this scheme. */
294 #define APP_CMD 0x0040
295 #define RESP_NONE 0x0300
296 #define RESP_R1 0x0400
297 #define RESP_R1B 0x0500
298 #define RESP_R2 0x0600
299 #define RESP_R3 0x0700
300 #define DATA_PRESENT 0x0800
301 #define TRANSFER_READ 0x1000
302 #define TRANSFER_MULTI 0x2000
303 #define SECURITY_CMD 0x4000
305 static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
307 struct mmc_data *data = host->data;
309 u32 irq_mask = TMIO_MASK_CMD;
311 /* CMD12 is handled by hardware */
312 if (cmd->opcode == MMC_STOP_TRANSMISSION && !cmd->arg) {
313 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
317 switch (mmc_resp_type(cmd)) {
318 case MMC_RSP_NONE: c |= RESP_NONE; break;
319 case MMC_RSP_R1: c |= RESP_R1; break;
320 case MMC_RSP_R1B: c |= RESP_R1B; break;
321 case MMC_RSP_R2: c |= RESP_R2; break;
322 case MMC_RSP_R3: c |= RESP_R3; break;
324 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
330 /* FIXME - this seems to be ok commented out but the spec suggest this bit
331 * should be set when issuing app commands.
332 * if(cmd->flags & MMC_FLAG_ACMD)
337 if (data->blocks > 1) {
338 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
341 if (data->flags & MMC_DATA_READ)
345 if (!host->native_hotplug)
346 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
347 tmio_mmc_enable_mmc_irqs(host, irq_mask);
349 /* Fire off the command */
350 sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
351 sd_ctrl_write16(host, CTL_SD_CMD, c);
357 * This chip always returns (at least?) as much data as you ask for.
358 * I'm unsure what happens if you ask for less than a block. This should be
359 * looked into to ensure that a funny length read doesn't hose the controller.
361 static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
363 struct mmc_data *data = host->data;
369 if ((host->chan_tx || host->chan_rx) && !host->force_pio) {
370 pr_err("PIO IRQ in DMA mode!\n");
373 pr_debug("Spurious PIO IRQ\n");
377 sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
378 buf = (unsigned short *)(sg_virt + host->sg_off);
380 count = host->sg_ptr->length - host->sg_off;
381 if (count > data->blksz)
384 pr_debug("count: %08x offset: %08x flags %08x\n",
385 count, host->sg_off, data->flags);
387 /* Transfer the data */
388 if (data->flags & MMC_DATA_READ)
389 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
391 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
393 host->sg_off += count;
395 tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
397 if (host->sg_off == host->sg_ptr->length)
398 tmio_mmc_next_sg(host);
403 static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
405 if (host->sg_ptr == &host->bounce_sg) {
407 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
408 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
409 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
413 /* needs to be called with host->lock held */
414 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
416 struct mmc_data *data = host->data;
417 struct mmc_command *stop;
422 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
427 /* FIXME - return correct transfer count on errors */
429 data->bytes_xfered = data->blocks * data->blksz;
431 data->bytes_xfered = 0;
433 pr_debug("Completed data request\n");
436 * FIXME: other drivers allow an optional stop command of any given type
437 * which we dont do, as the chip can auto generate them.
438 * Perhaps we can be smarter about when to use auto CMD12 and
439 * only issue the auto request when we know this is the desired
440 * stop command, allowing fallback to the stop command the
441 * upper layers expect. For now, we do what works.
444 if (data->flags & MMC_DATA_READ) {
445 if (host->chan_rx && !host->force_pio)
446 tmio_mmc_check_bounce_buffer(host);
447 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
450 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
455 if (stop->opcode == MMC_STOP_TRANSMISSION && !stop->arg)
456 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
461 schedule_work(&host->done);
464 static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
466 struct mmc_data *data;
467 spin_lock(&host->lock);
473 if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) {
475 * Has all data been written out yet? Testing on SuperH showed,
476 * that in most cases the first interrupt comes already with the
477 * BUSY status bit clear, but on some operations, like mount or
478 * in the beginning of a write / sync / umount, there is one
479 * DATAEND interrupt with the BUSY bit set, in this cases
480 * waiting for one more interrupt fixes the problem.
482 if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) {
483 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
484 tasklet_schedule(&host->dma_complete);
486 } else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) {
487 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
488 tasklet_schedule(&host->dma_complete);
490 tmio_mmc_do_data_irq(host);
491 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
494 spin_unlock(&host->lock);
497 static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
500 struct mmc_command *cmd = host->cmd;
503 spin_lock(&host->lock);
506 pr_debug("Spurious CMD irq\n");
512 /* This controller is sicker than the PXA one. Not only do we need to
513 * drop the top 8 bits of the first response word, we also need to
514 * modify the order of the response for short response command types.
517 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
518 cmd->resp[i] = sd_ctrl_read32(host, addr);
520 if (cmd->flags & MMC_RSP_136) {
521 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
522 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
523 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
525 } else if (cmd->flags & MMC_RSP_R3) {
526 cmd->resp[0] = cmd->resp[3];
529 if (stat & TMIO_STAT_CMDTIMEOUT)
530 cmd->error = -ETIMEDOUT;
531 else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC)
532 cmd->error = -EILSEQ;
534 /* If there is data to handle we enable data IRQs here, and
535 * we will ultimatley finish the request in the data_end handler.
536 * If theres no data or we encountered an error, finish now.
538 if (host->data && !cmd->error) {
539 if (host->data->flags & MMC_DATA_READ) {
540 if (host->force_pio || !host->chan_rx)
541 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
543 tasklet_schedule(&host->dma_issue);
545 if (host->force_pio || !host->chan_tx)
546 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
548 tasklet_schedule(&host->dma_issue);
551 schedule_work(&host->done);
555 spin_unlock(&host->lock);
558 static void tmio_mmc_card_irq_status(struct tmio_mmc_host *host,
559 int *ireg, int *status)
561 *status = sd_ctrl_read32(host, CTL_STATUS);
562 *ireg = *status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
564 pr_debug_status(*status);
565 pr_debug_status(*ireg);
568 static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
569 int ireg, int status)
571 struct mmc_host *mmc = host->mmc;
573 /* Card insert / remove attempts */
574 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
575 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
576 TMIO_STAT_CARD_REMOVE);
577 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
578 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
579 !work_pending(&mmc->detect.work))
580 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
587 irqreturn_t tmio_mmc_card_detect_irq(int irq, void *devid)
589 unsigned int ireg, status;
590 struct tmio_mmc_host *host = devid;
592 tmio_mmc_card_irq_status(host, &ireg, &status);
593 __tmio_mmc_card_detect_irq(host, ireg, status);
597 EXPORT_SYMBOL(tmio_mmc_card_detect_irq);
599 static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host,
600 int ireg, int status)
602 /* Command completion */
603 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
604 tmio_mmc_ack_mmc_irqs(host,
605 TMIO_STAT_CMDRESPEND |
606 TMIO_STAT_CMDTIMEOUT);
607 tmio_mmc_cmd_irq(host, status);
612 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
613 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
614 tmio_mmc_pio_irq(host);
618 /* Data transfer completion */
619 if (ireg & TMIO_STAT_DATAEND) {
620 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
621 tmio_mmc_data_irq(host);
628 irqreturn_t tmio_mmc_sdcard_irq(int irq, void *devid)
630 unsigned int ireg, status;
631 struct tmio_mmc_host *host = devid;
633 tmio_mmc_card_irq_status(host, &ireg, &status);
634 __tmio_mmc_sdcard_irq(host, ireg, status);
638 EXPORT_SYMBOL(tmio_mmc_sdcard_irq);
640 irqreturn_t tmio_mmc_sdio_irq(int irq, void *devid)
642 struct tmio_mmc_host *host = devid;
643 struct mmc_host *mmc = host->mmc;
644 struct tmio_mmc_data *pdata = host->pdata;
645 unsigned int ireg, status;
647 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
650 status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
651 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdcard_irq_mask;
653 sd_ctrl_write16(host, CTL_SDIO_STATUS, status & ~TMIO_SDIO_MASK_ALL);
655 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
656 mmc_signal_sdio_irq(mmc);
660 EXPORT_SYMBOL(tmio_mmc_sdio_irq);
662 irqreturn_t tmio_mmc_irq(int irq, void *devid)
664 struct tmio_mmc_host *host = devid;
665 unsigned int ireg, status;
667 pr_debug("MMC IRQ begin\n");
669 tmio_mmc_card_irq_status(host, &ireg, &status);
670 if (__tmio_mmc_card_detect_irq(host, ireg, status))
672 if (__tmio_mmc_sdcard_irq(host, ireg, status))
675 tmio_mmc_sdio_irq(irq, devid);
679 EXPORT_SYMBOL(tmio_mmc_irq);
681 static int tmio_mmc_start_data(struct tmio_mmc_host *host,
682 struct mmc_data *data)
684 struct tmio_mmc_data *pdata = host->pdata;
686 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
687 data->blksz, data->blocks);
689 /* Some hardware cannot perform 2 byte requests in 4 bit mode */
690 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
691 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
693 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
694 pr_err("%s: %d byte block unsupported in 4 bit mode\n",
695 mmc_hostname(host->mmc), data->blksz);
700 tmio_mmc_init_sg(host, data);
703 /* Set transfer length / blocksize */
704 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
705 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
707 tmio_mmc_start_dma(host, data);
712 /* Process requests from the MMC layer */
713 static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
715 struct tmio_mmc_host *host = mmc_priv(mmc);
719 spin_lock_irqsave(&host->lock, flags);
722 pr_debug("request not null\n");
723 if (IS_ERR(host->mrq)) {
724 spin_unlock_irqrestore(&host->lock, flags);
725 mrq->cmd->error = -EAGAIN;
726 mmc_request_done(mmc, mrq);
731 host->last_req_ts = jiffies;
735 spin_unlock_irqrestore(&host->lock, flags);
738 ret = tmio_mmc_start_data(host, mrq->data);
743 ret = tmio_mmc_start_command(host, mrq->cmd);
745 schedule_delayed_work(&host->delayed_reset_work,
746 msecs_to_jiffies(2000));
751 host->force_pio = false;
753 mrq->cmd->error = ret;
754 mmc_request_done(mmc, mrq);
757 static int tmio_mmc_clk_update(struct mmc_host *mmc)
759 struct tmio_mmc_host *host = mmc_priv(mmc);
760 struct tmio_mmc_data *pdata = host->pdata;
763 if (!pdata->clk_enable)
766 ret = pdata->clk_enable(host->pdev, &mmc->f_max);
768 mmc->f_min = mmc->f_max / 512;
773 static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd)
775 struct mmc_host *mmc = host->mmc;
778 /* .set_ios() is returning void, so, no chance to report an error */
781 host->set_pwr(host->pdev, 1);
783 if (!IS_ERR(mmc->supply.vmmc)) {
784 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
786 * Attention: empiric value. With a b43 WiFi SDIO card this
787 * delay proved necessary for reliable card-insertion probing.
788 * 100us were not enough. Is this the same 140us delay, as in
789 * tmio_mmc_set_ios()?
794 * It seems, VccQ should be switched on after Vcc, this is also what the
795 * omap_hsmmc.c driver does.
797 if (!IS_ERR(mmc->supply.vqmmc) && !ret) {
798 ret = regulator_enable(mmc->supply.vqmmc);
803 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n",
807 static void tmio_mmc_power_off(struct tmio_mmc_host *host)
809 struct mmc_host *mmc = host->mmc;
811 if (!IS_ERR(mmc->supply.vqmmc))
812 regulator_disable(mmc->supply.vqmmc);
814 if (!IS_ERR(mmc->supply.vmmc))
815 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
818 host->set_pwr(host->pdev, 0);
821 /* Set MMC clock / power.
822 * Note: This controller uses a simple divider scheme therefore it cannot
823 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
824 * MMC wont run that fast, it has to be clocked at 12MHz which is the next
827 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
829 struct tmio_mmc_host *host = mmc_priv(mmc);
830 struct device *dev = &host->pdev->dev;
833 mutex_lock(&host->ios_lock);
835 spin_lock_irqsave(&host->lock, flags);
837 if (IS_ERR(host->mrq)) {
839 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
840 current->comm, task_pid_nr(current),
841 ios->clock, ios->power_mode);
842 host->mrq = ERR_PTR(-EINTR);
845 "%s.%d: CMD%u active since %lu, now %lu!\n",
846 current->comm, task_pid_nr(current),
847 host->mrq->cmd->opcode, host->last_req_ts, jiffies);
849 spin_unlock_irqrestore(&host->lock, flags);
851 mutex_unlock(&host->ios_lock);
855 host->mrq = ERR_PTR(-EBUSY);
857 spin_unlock_irqrestore(&host->lock, flags);
860 * host->power toggles between false and true in both cases - either
861 * or not the controller can be runtime-suspended during inactivity.
862 * But if the controller has to be kept on, the runtime-pm usage_count
863 * is kept positive, so no suspending actually takes place.
865 if (ios->power_mode == MMC_POWER_ON && ios->clock) {
866 if (host->power != TMIO_MMC_ON_RUN) {
867 tmio_mmc_clk_update(mmc);
868 pm_runtime_get_sync(dev);
869 if (host->resuming) {
870 tmio_mmc_reset(host);
871 host->resuming = false;
874 if (host->power == TMIO_MMC_OFF_STOP)
875 tmio_mmc_reset(host);
876 tmio_mmc_set_clock(host, ios->clock);
877 if (host->power == TMIO_MMC_OFF_STOP)
878 /* power up SD card and the bus */
879 tmio_mmc_power_on(host, ios->vdd);
880 host->power = TMIO_MMC_ON_RUN;
881 /* start bus clock */
882 tmio_mmc_clk_start(host);
883 } else if (ios->power_mode != MMC_POWER_UP) {
884 struct tmio_mmc_data *pdata = host->pdata;
885 unsigned int old_power = host->power;
887 if (old_power != TMIO_MMC_OFF_STOP) {
888 if (ios->power_mode == MMC_POWER_OFF) {
889 tmio_mmc_power_off(host);
890 host->power = TMIO_MMC_OFF_STOP;
892 host->power = TMIO_MMC_ON_STOP;
896 if (old_power == TMIO_MMC_ON_RUN) {
897 tmio_mmc_clk_stop(host);
899 if (pdata->clk_disable)
900 pdata->clk_disable(host->pdev);
904 if (host->power != TMIO_MMC_OFF_STOP) {
905 switch (ios->bus_width) {
906 case MMC_BUS_WIDTH_1:
907 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
909 case MMC_BUS_WIDTH_4:
910 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
915 /* Let things settle. delay taken from winCE driver */
917 if (PTR_ERR(host->mrq) == -EINTR)
918 dev_dbg(&host->pdev->dev,
919 "%s.%d: IOS interrupted: clk %u, mode %u",
920 current->comm, task_pid_nr(current),
921 ios->clock, ios->power_mode);
924 mutex_unlock(&host->ios_lock);
927 static int tmio_mmc_get_ro(struct mmc_host *mmc)
929 struct tmio_mmc_host *host = mmc_priv(mmc);
930 struct tmio_mmc_data *pdata = host->pdata;
931 int ret = mmc_gpio_get_ro(mmc);
935 return !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
936 (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
939 static const struct mmc_host_ops tmio_mmc_ops = {
940 .request = tmio_mmc_request,
941 .set_ios = tmio_mmc_set_ios,
942 .get_ro = tmio_mmc_get_ro,
943 .get_cd = mmc_gpio_get_cd,
944 .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
947 static void tmio_mmc_init_ocr(struct tmio_mmc_host *host)
949 struct tmio_mmc_data *pdata = host->pdata;
950 struct mmc_host *mmc = host->mmc;
952 mmc_regulator_get_supply(mmc);
955 mmc->ocr_avail = pdata->ocr_mask ? : MMC_VDD_32_33 | MMC_VDD_33_34;
956 else if (pdata->ocr_mask)
957 dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
960 static void tmio_mmc_of_parse(struct platform_device *pdev,
961 struct tmio_mmc_data *pdata)
963 const struct device_node *np = pdev->dev.of_node;
967 if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL))
968 pdata->flags |= TMIO_MMC_WRPROTECT_DISABLE;
971 int tmio_mmc_host_probe(struct tmio_mmc_host **host,
972 struct platform_device *pdev,
973 struct tmio_mmc_data *pdata)
975 struct tmio_mmc_host *_host;
976 struct mmc_host *mmc;
977 struct resource *res_ctl;
979 u32 irq_mask = TMIO_MASK_CMD;
981 tmio_mmc_of_parse(pdev, pdata);
983 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
984 pdata->write16_hook = NULL;
986 res_ctl = platform_get_resource(pdev, IORESOURCE_MEM, 0);
990 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
994 ret = mmc_of_parse(mmc);
998 pdata->dev = &pdev->dev;
999 _host = mmc_priv(mmc);
1000 _host->pdata = pdata;
1003 platform_set_drvdata(pdev, mmc);
1005 _host->set_pwr = pdata->set_pwr;
1006 _host->set_clk_div = pdata->set_clk_div;
1008 /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
1009 _host->bus_shift = resource_size(res_ctl) >> 10;
1011 _host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
1017 mmc->ops = &tmio_mmc_ops;
1018 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
1019 mmc->caps2 |= pdata->capabilities2;
1021 mmc->max_blk_size = 512;
1022 mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
1024 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1025 mmc->max_seg_size = mmc->max_req_size;
1026 tmio_mmc_init_ocr(_host);
1028 _host->native_hotplug = !(pdata->flags & TMIO_MMC_USE_GPIO_CD ||
1029 mmc->caps & MMC_CAP_NEEDS_POLL ||
1030 mmc->caps & MMC_CAP_NONREMOVABLE ||
1031 mmc->slot.cd_irq >= 0);
1033 _host->power = TMIO_MMC_OFF_STOP;
1034 pm_runtime_enable(&pdev->dev);
1035 ret = pm_runtime_resume(&pdev->dev);
1039 if (tmio_mmc_clk_update(mmc) < 0) {
1040 mmc->f_max = pdata->hclk;
1041 mmc->f_min = mmc->f_max / 512;
1045 * There are 4 different scenarios for the card detection:
1046 * 1) an external gpio irq handles the cd (best for power savings)
1047 * 2) internal sdhi irq handles the cd
1048 * 3) a worker thread polls the sdhi - indicated by MMC_CAP_NEEDS_POLL
1049 * 4) the medium is non-removable - indicated by MMC_CAP_NONREMOVABLE
1051 * While we increment the runtime PM counter for all scenarios when
1052 * the mmc core activates us by calling an appropriate set_ios(), we
1053 * must additionally ensure that in case 2) the tmio mmc hardware stays
1054 * powered on during runtime for the card detection to work.
1056 if (_host->native_hotplug)
1057 pm_runtime_get_noresume(&pdev->dev);
1059 tmio_mmc_clk_stop(_host);
1060 tmio_mmc_reset(_host);
1062 _host->sdcard_irq_mask = sd_ctrl_read32(_host, CTL_IRQ_MASK);
1063 tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
1065 /* Unmask the IRQs we want to know about */
1066 if (!_host->chan_rx)
1067 irq_mask |= TMIO_MASK_READOP;
1068 if (!_host->chan_tx)
1069 irq_mask |= TMIO_MASK_WRITEOP;
1070 if (!_host->native_hotplug)
1071 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
1073 _host->sdcard_irq_mask &= ~irq_mask;
1075 if (pdata->flags & TMIO_MMC_SDIO_IRQ)
1076 tmio_mmc_enable_sdio_irq(mmc, 0);
1078 spin_lock_init(&_host->lock);
1079 mutex_init(&_host->ios_lock);
1081 /* Init delayed work for request timeouts */
1082 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
1083 INIT_WORK(&_host->done, tmio_mmc_done_work);
1085 /* See if we also get DMA */
1086 tmio_mmc_request_dma(_host, pdata);
1088 ret = mmc_add_host(mmc);
1089 if (pdata->clk_disable)
1090 pdata->clk_disable(pdev);
1092 tmio_mmc_host_remove(_host);
1096 dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
1098 if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
1099 ret = mmc_gpio_request_cd(mmc, pdata->cd_gpio, 0);
1101 tmio_mmc_host_remove(_host);
1111 pm_runtime_disable(&pdev->dev);
1112 iounmap(_host->ctl);
1118 EXPORT_SYMBOL(tmio_mmc_host_probe);
1120 void tmio_mmc_host_remove(struct tmio_mmc_host *host)
1122 struct platform_device *pdev = host->pdev;
1123 struct mmc_host *mmc = host->mmc;
1125 if (!host->native_hotplug)
1126 pm_runtime_get_sync(&pdev->dev);
1128 dev_pm_qos_hide_latency_limit(&pdev->dev);
1130 mmc_remove_host(mmc);
1131 cancel_work_sync(&host->done);
1132 cancel_delayed_work_sync(&host->delayed_reset_work);
1133 tmio_mmc_release_dma(host);
1135 pm_runtime_put_sync(&pdev->dev);
1136 pm_runtime_disable(&pdev->dev);
1141 EXPORT_SYMBOL(tmio_mmc_host_remove);
1144 int tmio_mmc_host_suspend(struct device *dev)
1146 struct mmc_host *mmc = dev_get_drvdata(dev);
1147 struct tmio_mmc_host *host = mmc_priv(mmc);
1149 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
1152 EXPORT_SYMBOL(tmio_mmc_host_suspend);
1154 int tmio_mmc_host_resume(struct device *dev)
1156 struct mmc_host *mmc = dev_get_drvdata(dev);
1157 struct tmio_mmc_host *host = mmc_priv(mmc);
1159 tmio_mmc_enable_dma(host, true);
1161 /* The MMC core will perform the complete set up */
1162 host->resuming = true;
1165 EXPORT_SYMBOL(tmio_mmc_host_resume);
1167 #endif /* CONFIG_PM */
1169 int tmio_mmc_host_runtime_suspend(struct device *dev)
1173 EXPORT_SYMBOL(tmio_mmc_host_runtime_suspend);
1175 int tmio_mmc_host_runtime_resume(struct device *dev)
1177 struct mmc_host *mmc = dev_get_drvdata(dev);
1178 struct tmio_mmc_host *host = mmc_priv(mmc);
1180 tmio_mmc_enable_dma(host, true);
1184 EXPORT_SYMBOL(tmio_mmc_host_runtime_resume);
1186 MODULE_LICENSE("GPL v2");