2 * drivers/mmc/host/omap_hsmmc.c
4 * Driver for OMAP2430/3430 MMC controller.
6 * Copyright (C) 2007 Texas Instruments.
9 * Syed Mohammed Khasim <x0khasim@ti.com>
10 * Madhusudhan <madhu.cr@ti.com>
11 * Mohit Jalori <mjalori@ti.com>
13 * This file is licensed under the terms of the GNU General Public License
14 * version 2. This program is licensed "as is" without any warranty of any
15 * kind, whether express or implied.
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
21 #include <linux/delay.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/platform_device.h>
24 #include <linux/workqueue.h>
25 #include <linux/timer.h>
26 #include <linux/clk.h>
27 #include <linux/mmc/host.h>
29 #include <linux/semaphore.h>
31 #include <mach/hardware.h>
32 #include <mach/board.h>
36 /* OMAP HSMMC Host Controller Registers */
37 #define OMAP_HSMMC_SYSCONFIG 0x0010
38 #define OMAP_HSMMC_CON 0x002C
39 #define OMAP_HSMMC_BLK 0x0104
40 #define OMAP_HSMMC_ARG 0x0108
41 #define OMAP_HSMMC_CMD 0x010C
42 #define OMAP_HSMMC_RSP10 0x0110
43 #define OMAP_HSMMC_RSP32 0x0114
44 #define OMAP_HSMMC_RSP54 0x0118
45 #define OMAP_HSMMC_RSP76 0x011C
46 #define OMAP_HSMMC_DATA 0x0120
47 #define OMAP_HSMMC_HCTL 0x0128
48 #define OMAP_HSMMC_SYSCTL 0x012C
49 #define OMAP_HSMMC_STAT 0x0130
50 #define OMAP_HSMMC_IE 0x0134
51 #define OMAP_HSMMC_ISE 0x0138
52 #define OMAP_HSMMC_CAPA 0x0140
54 #define VS18 (1 << 26)
55 #define VS30 (1 << 25)
56 #define SDVS18 (0x5 << 9)
57 #define SDVS30 (0x6 << 9)
58 #define SDVS33 (0x7 << 9)
59 #define SDVSCLR 0xFFFFF1FF
60 #define SDVSDET 0x00000400
67 #define CLKD_MASK 0x0000FFC0
69 #define DTO_MASK 0x000F0000
71 #define INT_EN_MASK 0x307F0033
72 #define INIT_STREAM (1 << 1)
73 #define DP_SELECT (1 << 21)
78 #define FOUR_BIT (1 << 1)
83 #define CMD_TIMEOUT (1 << 16)
84 #define DATA_TIMEOUT (1 << 20)
85 #define CMD_CRC (1 << 17)
86 #define DATA_CRC (1 << 21)
87 #define CARD_ERR (1 << 28)
88 #define STAT_CLEAR 0xFFFFFFFF
89 #define INIT_STREAM_CMD 0x00000000
90 #define DUAL_VOLT_OCR_BIT 7
95 * FIXME: Most likely all the data using these _DEVID defines should come
96 * from the platform_data, or implemented in controller and slot specific
99 #define OMAP_MMC1_DEVID 0
100 #define OMAP_MMC2_DEVID 1
102 #define OMAP_MMC_DATADIR_NONE 0
103 #define OMAP_MMC_DATADIR_READ 1
104 #define OMAP_MMC_DATADIR_WRITE 2
105 #define MMC_TIMEOUT_MS 20
106 #define OMAP_MMC_MASTER_CLOCK 96000000
107 #define DRIVER_NAME "mmci-omap-hs"
110 * One controller can have multiple slots, like on some omap boards using
111 * omap.c controller driver. Luckily this is not currently done on any known
112 * omap_hsmmc.c device.
114 #define mmc_slot(host) (host->pdata->slots[host->slot_id])
117 * MMC Host controller read/write API's
119 #define OMAP_HSMMC_READ(base, reg) \
120 __raw_readl((base) + OMAP_HSMMC_##reg)
122 #define OMAP_HSMMC_WRITE(base, reg, val) \
123 __raw_writel((val), (base) + OMAP_HSMMC_##reg)
125 struct mmc_omap_host {
127 struct mmc_host *mmc;
128 struct mmc_request *mrq;
129 struct mmc_command *cmd;
130 struct mmc_data *data;
134 struct semaphore sem;
135 struct work_struct mmc_carddetect_work;
137 resource_size_t mapbase;
139 unsigned int dma_len;
140 unsigned int dma_dir;
141 unsigned char bus_mode;
142 unsigned char datadir;
152 struct omap_mmc_platform_data *pdata;
156 * Stop clock to the card
158 static void omap_mmc_stop_clock(struct mmc_omap_host *host)
160 OMAP_HSMMC_WRITE(host->base, SYSCTL,
161 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
162 if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
163 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n");
167 * Send init stream sequence to card
168 * before sending IDLE command
170 static void send_init_stream(struct mmc_omap_host *host)
173 unsigned long timeout;
175 disable_irq(host->irq);
176 OMAP_HSMMC_WRITE(host->base, CON,
177 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
178 OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
180 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
181 while ((reg != CC) && time_before(jiffies, timeout))
182 reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
184 OMAP_HSMMC_WRITE(host->base, CON,
185 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
186 enable_irq(host->irq);
190 int mmc_omap_cover_is_closed(struct mmc_omap_host *host)
194 if (host->pdata->slots[host->slot_id].get_cover_state)
195 r = host->pdata->slots[host->slot_id].get_cover_state(host->dev,
201 mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr,
204 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
205 struct mmc_omap_host *host = mmc_priv(mmc);
207 return sprintf(buf, "%s\n", mmc_omap_cover_is_closed(host) ? "closed" :
211 static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
214 mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
217 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
218 struct mmc_omap_host *host = mmc_priv(mmc);
219 struct omap_mmc_slot_data slot = host->pdata->slots[host->slot_id];
221 return sprintf(buf, "slot:%s\n", slot.name);
224 static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
227 * Configure the response type and send the cmd.
230 mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd,
231 struct mmc_data *data)
233 int cmdreg = 0, resptype = 0, cmdtype = 0;
235 dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
236 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
240 * Clear status bits and enable interrupts
242 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
243 OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
244 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
246 if (cmd->flags & MMC_RSP_PRESENT) {
247 if (cmd->flags & MMC_RSP_136)
254 * Unlike OMAP1 controller, the cmdtype does not seem to be based on
255 * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
256 * a val of 0x3, rest 0x0.
258 if (cmd == host->mrq->stop)
261 cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
264 cmdreg |= DP_SELECT | MSBS | BCE;
265 if (data->flags & MMC_DATA_READ)
274 OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
275 OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
279 * Notify the transfer complete to MMC core
282 mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
286 if (host->use_dma && host->dma_ch != -1)
287 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
290 host->datadir = OMAP_MMC_DATADIR_NONE;
293 data->bytes_xfered += data->blocks * (data->blksz);
295 data->bytes_xfered = 0;
299 mmc_request_done(host->mmc, data->mrq);
302 mmc_omap_start_command(host, data->stop, NULL);
306 * Notify the core about command completion
309 mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
313 if (cmd->flags & MMC_RSP_PRESENT) {
314 if (cmd->flags & MMC_RSP_136) {
315 /* response type 2 */
316 cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
317 cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
318 cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
319 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
321 /* response types 1, 1b, 3, 4, 5, 6 */
322 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
325 if (host->data == NULL || cmd->error) {
327 mmc_request_done(host->mmc, cmd->mrq);
332 * DMA clean up for command errors
334 static void mmc_dma_cleanup(struct mmc_omap_host *host)
336 host->data->error = -ETIMEDOUT;
338 if (host->use_dma && host->dma_ch != -1) {
339 dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
341 omap_free_dma(host->dma_ch);
346 host->datadir = OMAP_MMC_DATADIR_NONE;
350 * Readable error output
352 #ifdef CONFIG_MMC_DEBUG
353 static void mmc_omap_report_irq(struct mmc_omap_host *host, u32 status)
355 /* --- means reserved bit without definition at documentation */
356 static const char *mmc_omap_status_bits[] = {
357 "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ",
358 "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC",
359 "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---",
360 "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---"
366 len = sprintf(buf, "MMC IRQ 0x%x :", status);
369 for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
370 if (status & (1 << i)) {
371 len = sprintf(buf, " %s", mmc_omap_status_bits[i]);
375 dev_dbg(mmc_dev(host->mmc), "%s\n", res);
377 #endif /* CONFIG_MMC_DEBUG */
380 * MMC controller internal state machines reset
382 * Used to reset command or data internal state machines, using respectively
383 * SRC or SRD bit of SYSCTL register
384 * Can be called from interrupt context
386 static inline void mmc_omap_reset_controller_fsm(struct mmc_omap_host *host,
390 unsigned long limit = (loops_per_jiffy *
391 msecs_to_jiffies(MMC_TIMEOUT_MS));
393 OMAP_HSMMC_WRITE(host->base, SYSCTL,
394 OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
396 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
400 if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
401 dev_err(mmc_dev(host->mmc),
402 "Timeout waiting on controller reset in %s\n",
407 * MMC controller IRQ handler
409 static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
411 struct mmc_omap_host *host = dev_id;
412 struct mmc_data *data;
413 int end_cmd = 0, end_trans = 0, status;
415 if (host->cmd == NULL && host->data == NULL) {
416 OMAP_HSMMC_WRITE(host->base, STAT,
417 OMAP_HSMMC_READ(host->base, STAT));
422 status = OMAP_HSMMC_READ(host->base, STAT);
423 dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
426 #ifdef CONFIG_MMC_DEBUG
427 mmc_omap_report_irq(host, status);
429 if ((status & CMD_TIMEOUT) ||
430 (status & CMD_CRC)) {
432 if (status & CMD_TIMEOUT) {
433 mmc_omap_reset_controller_fsm(host, SRC);
434 host->cmd->error = -ETIMEDOUT;
436 host->cmd->error = -EILSEQ;
441 mmc_dma_cleanup(host);
442 mmc_omap_reset_controller_fsm(host, SRD);
445 if ((status & DATA_TIMEOUT) ||
446 (status & DATA_CRC)) {
448 if (status & DATA_TIMEOUT)
449 mmc_dma_cleanup(host);
451 host->data->error = -EILSEQ;
452 mmc_omap_reset_controller_fsm(host, SRD);
456 if (status & CARD_ERR) {
457 dev_dbg(mmc_dev(host->mmc),
458 "Ignoring card err CMD%d\n", host->cmd->opcode);
466 OMAP_HSMMC_WRITE(host->base, STAT, status);
467 OMAP_HSMMC_READ(host->base, STAT); /* flush posted write */
469 if (end_cmd || (status & CC))
470 mmc_omap_cmd_done(host, host->cmd);
471 if (end_trans || (status & TC))
472 mmc_omap_xfer_done(host, data);
478 * Switch MMC interface voltage ... only relevant for MMC1.
480 * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
481 * The MMC2 transceiver controls are used instead of DAT4..DAT7.
482 * Some chips, like eMMC ones, use internal transceivers.
484 static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
489 if (host->id != OMAP_MMC1_DEVID)
492 /* Disable the clocks */
493 clk_disable(host->fclk);
494 clk_disable(host->iclk);
495 clk_disable(host->dbclk);
497 /* Turn the power off */
498 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
502 /* Turn the power ON with given VDD 1.8 or 3.0v */
503 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1, vdd);
507 clk_enable(host->fclk);
508 clk_enable(host->iclk);
509 clk_enable(host->dbclk);
511 OMAP_HSMMC_WRITE(host->base, HCTL,
512 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
513 reg_val = OMAP_HSMMC_READ(host->base, HCTL);
516 * If a MMC dual voltage card is detected, the set_ios fn calls
517 * this fn with VDD bit set for 1.8V. Upon card removal from the
518 * slot, omap_mmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
520 * Cope with a bit of slop in the range ... per data sheets:
521 * - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
522 * but recommended values are 1.71V to 1.89V
523 * - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
524 * but recommended values are 2.7V to 3.3V
526 * Board setup code shouldn't permit anything very out-of-range.
527 * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
528 * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
530 if ((1 << vdd) <= MMC_VDD_23_24)
535 OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
537 OMAP_HSMMC_WRITE(host->base, HCTL,
538 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
542 dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
547 * Work Item to notify the core about card insertion/removal
549 static void mmc_omap_detect(struct work_struct *work)
551 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
552 mmc_carddetect_work);
553 struct omap_mmc_slot_data *slot = &mmc_slot(host);
555 host->carddetect = slot->card_detect(slot->card_detect_irq);
557 sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
558 if (host->carddetect) {
559 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
561 mmc_omap_reset_controller_fsm(host, SRD);
562 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
567 * ISR for handling card insertion and removal
569 static irqreturn_t omap_mmc_cd_handler(int irq, void *dev_id)
571 struct mmc_omap_host *host = (struct mmc_omap_host *)dev_id;
573 schedule_work(&host->mmc_carddetect_work);
579 * DMA call back function
581 static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
583 struct mmc_omap_host *host = data;
585 if (ch_status & OMAP2_DMA_MISALIGNED_ERR_IRQ)
586 dev_dbg(mmc_dev(host->mmc), "MISALIGNED_ADRS_ERR\n");
588 if (host->dma_ch < 0)
591 omap_free_dma(host->dma_ch);
594 * DMA Callback: run in interrupt context.
595 * mutex_unlock will through a kernel warning if used.
601 * Configure dma src and destination parameters
603 static int mmc_omap_config_dma_param(int sync_dir, struct mmc_omap_host *host,
604 struct mmc_data *data)
607 omap_set_dma_dest_params(host->dma_ch, 0,
608 OMAP_DMA_AMODE_CONSTANT,
609 (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
610 omap_set_dma_src_params(host->dma_ch, 0,
611 OMAP_DMA_AMODE_POST_INC,
612 sg_dma_address(&data->sg[0]), 0, 0);
614 omap_set_dma_src_params(host->dma_ch, 0,
615 OMAP_DMA_AMODE_CONSTANT,
616 (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
617 omap_set_dma_dest_params(host->dma_ch, 0,
618 OMAP_DMA_AMODE_POST_INC,
619 sg_dma_address(&data->sg[0]), 0, 0);
624 * Routine to configure and start DMA for the MMC card
627 mmc_omap_start_dma_transfer(struct mmc_omap_host *host, struct mmc_request *req)
629 int sync_dev, sync_dir = 0;
630 int dma_ch = 0, ret = 0, err = 1;
631 struct mmc_data *data = req->data;
634 * If for some reason the DMA transfer is still active,
635 * we wait for timeout period and free the dma
637 if (host->dma_ch != -1) {
638 set_current_state(TASK_UNINTERRUPTIBLE);
639 schedule_timeout(100);
640 if (down_trylock(&host->sem)) {
641 omap_free_dma(host->dma_ch);
647 if (down_trylock(&host->sem))
651 if (!(data->flags & MMC_DATA_WRITE)) {
652 host->dma_dir = DMA_FROM_DEVICE;
653 if (host->id == OMAP_MMC1_DEVID)
654 sync_dev = OMAP24XX_DMA_MMC1_RX;
656 sync_dev = OMAP24XX_DMA_MMC2_RX;
658 host->dma_dir = DMA_TO_DEVICE;
659 if (host->id == OMAP_MMC1_DEVID)
660 sync_dev = OMAP24XX_DMA_MMC1_TX;
662 sync_dev = OMAP24XX_DMA_MMC2_TX;
665 ret = omap_request_dma(sync_dev, "MMC/SD", mmc_omap_dma_cb,
668 dev_dbg(mmc_dev(host->mmc),
669 "%s: omap_request_dma() failed with %d\n",
670 mmc_hostname(host->mmc), ret);
674 host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
675 data->sg_len, host->dma_dir);
676 host->dma_ch = dma_ch;
678 if (!(data->flags & MMC_DATA_WRITE))
679 mmc_omap_config_dma_param(1, host, data);
681 mmc_omap_config_dma_param(0, host, data);
683 if ((data->blksz % 4) == 0)
684 omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
685 (data->blksz / 4), data->blocks, OMAP_DMA_SYNC_FRAME,
688 /* REVISIT: The MMC buffer increments only when MSB is written.
689 * Return error for blksz which is non multiple of four.
693 omap_start_dma(dma_ch);
697 static void set_data_timeout(struct mmc_omap_host *host,
698 struct mmc_request *req)
700 unsigned int timeout, cycle_ns;
701 uint32_t reg, clkd, dto = 0;
703 reg = OMAP_HSMMC_READ(host->base, SYSCTL);
704 clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
708 cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
709 timeout = req->data->timeout_ns / cycle_ns;
710 timeout += req->data->timeout_clks;
712 while ((timeout & 0x80000000) == 0) {
729 reg |= dto << DTO_SHIFT;
730 OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
734 * Configure block length for MMC/SD cards and initiate the transfer.
737 mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
740 host->data = req->data;
742 if (req->data == NULL) {
743 host->datadir = OMAP_MMC_DATADIR_NONE;
744 OMAP_HSMMC_WRITE(host->base, BLK, 0);
748 OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
749 | (req->data->blocks << 16));
750 set_data_timeout(host, req);
752 host->datadir = (req->data->flags & MMC_DATA_WRITE) ?
753 OMAP_MMC_DATADIR_WRITE : OMAP_MMC_DATADIR_READ;
756 ret = mmc_omap_start_dma_transfer(host, req);
758 dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
766 * Request function. for read/write operation
768 static void omap_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
770 struct mmc_omap_host *host = mmc_priv(mmc);
772 WARN_ON(host->mrq != NULL);
774 mmc_omap_prepare_data(host, req);
775 mmc_omap_start_command(host, req->cmd, req->data);
779 /* Routine to configure clock values. Exposed API to core */
780 static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
782 struct mmc_omap_host *host = mmc_priv(mmc);
784 unsigned long regval;
785 unsigned long timeout;
787 switch (ios->power_mode) {
789 mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
791 * Reset interface voltage to 3V if it's 1.8V now;
792 * only relevant on MMC-1, the others always use 1.8V.
794 * REVISIT: If we are able to detect cards after unplugging
795 * a 1.8V card, this code should not be needed.
797 if (host->id != OMAP_MMC1_DEVID)
799 if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) {
800 int vdd = fls(host->mmc->ocr_avail) - 1;
801 if (omap_mmc_switch_opcond(host, vdd) != 0)
802 host->mmc->ios.vdd = vdd;
806 mmc_slot(host).set_power(host->dev, host->slot_id, 1, ios->vdd);
810 switch (mmc->ios.bus_width) {
811 case MMC_BUS_WIDTH_4:
812 OMAP_HSMMC_WRITE(host->base, HCTL,
813 OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
815 case MMC_BUS_WIDTH_1:
816 OMAP_HSMMC_WRITE(host->base, HCTL,
817 OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
821 if (host->id == OMAP_MMC1_DEVID) {
822 /* Only MMC1 can interface at 3V without some flavor
823 * of external transceiver; but they all handle 1.8V.
825 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
826 (ios->vdd == DUAL_VOLT_OCR_BIT)) {
828 * The mmc_select_voltage fn of the core does
829 * not seem to set the power_mode to
830 * MMC_POWER_UP upon recalculating the voltage.
833 if (omap_mmc_switch_opcond(host, ios->vdd) != 0)
834 dev_dbg(mmc_dev(host->mmc),
835 "Switch operation failed\n");
840 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
844 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
850 omap_mmc_stop_clock(host);
851 regval = OMAP_HSMMC_READ(host->base, SYSCTL);
852 regval = regval & ~(CLKD_MASK);
853 regval = regval | (dsor << 6) | (DTO << 16);
854 OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
855 OMAP_HSMMC_WRITE(host->base, SYSCTL,
856 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
858 /* Wait till the ICS bit is set */
859 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
860 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != 0x2
861 && time_before(jiffies, timeout))
864 OMAP_HSMMC_WRITE(host->base, SYSCTL,
865 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
867 if (ios->power_mode == MMC_POWER_ON)
868 send_init_stream(host);
870 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
871 OMAP_HSMMC_WRITE(host->base, CON,
872 OMAP_HSMMC_READ(host->base, CON) | OD);
875 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
877 struct mmc_omap_host *host = mmc_priv(mmc);
878 struct omap_mmc_platform_data *pdata = host->pdata;
880 if (!pdata->slots[0].card_detect)
882 return pdata->slots[0].card_detect(pdata->slots[0].card_detect_irq);
885 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
887 struct mmc_omap_host *host = mmc_priv(mmc);
888 struct omap_mmc_platform_data *pdata = host->pdata;
890 if (!pdata->slots[0].get_ro)
892 return pdata->slots[0].get_ro(host->dev, 0);
895 static struct mmc_host_ops mmc_omap_ops = {
896 .request = omap_mmc_request,
897 .set_ios = omap_mmc_set_ios,
898 .get_cd = omap_hsmmc_get_cd,
899 .get_ro = omap_hsmmc_get_ro,
900 /* NYET -- enable_sdio_irq */
903 static int __init omap_mmc_probe(struct platform_device *pdev)
905 struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
906 struct mmc_host *mmc;
907 struct mmc_omap_host *host = NULL;
908 struct resource *res;
913 dev_err(&pdev->dev, "Platform Data is missing\n");
917 if (pdata->nr_slots == 0) {
918 dev_err(&pdev->dev, "No Slots\n");
922 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
923 irq = platform_get_irq(pdev, 0);
924 if (res == NULL || irq < 0)
927 res = request_mem_region(res->start, res->end - res->start + 1,
932 mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
938 host = mmc_priv(mmc);
941 host->dev = &pdev->dev;
943 host->dev->dma_mask = &pdata->dma_mask;
948 host->mapbase = res->start;
949 host->base = ioremap(host->mapbase, SZ_4K);
951 platform_set_drvdata(pdev, host);
952 INIT_WORK(&host->mmc_carddetect_work, mmc_omap_detect);
954 mmc->ops = &mmc_omap_ops;
956 mmc->f_max = 52000000;
958 sema_init(&host->sem, 1);
960 host->iclk = clk_get(&pdev->dev, "ick");
961 if (IS_ERR(host->iclk)) {
962 ret = PTR_ERR(host->iclk);
966 host->fclk = clk_get(&pdev->dev, "fck");
967 if (IS_ERR(host->fclk)) {
968 ret = PTR_ERR(host->fclk);
974 if (clk_enable(host->fclk) != 0) {
980 if (clk_enable(host->iclk) != 0) {
981 clk_disable(host->fclk);
987 host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
989 * MMC can still work without debounce clock.
991 if (IS_ERR(host->dbclk))
992 dev_warn(mmc_dev(host->mmc), "Failed to get debounce clock\n");
994 if (clk_enable(host->dbclk) != 0)
995 dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
998 host->dbclk_enabled = 1;
1000 #ifdef CONFIG_MMC_BLOCK_BOUNCE
1001 mmc->max_phys_segs = 1;
1002 mmc->max_hw_segs = 1;
1004 mmc->max_blk_size = 512; /* Block Length at max can be 1024 */
1005 mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */
1006 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1007 mmc->max_seg_size = mmc->max_req_size;
1009 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED;
1011 if (pdata->slots[host->slot_id].wires >= 4)
1012 mmc->caps |= MMC_CAP_4_BIT_DATA;
1014 /* Only MMC1 supports 3.0V */
1015 if (host->id == OMAP_MMC1_DEVID) {
1023 OMAP_HSMMC_WRITE(host->base, HCTL,
1024 OMAP_HSMMC_READ(host->base, HCTL) | hctl);
1026 OMAP_HSMMC_WRITE(host->base, CAPA,
1027 OMAP_HSMMC_READ(host->base, CAPA) | capa);
1029 /* Set the controller to AUTO IDLE mode */
1030 OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
1031 OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
1033 /* Set SD bus power bit */
1034 OMAP_HSMMC_WRITE(host->base, HCTL,
1035 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1037 /* Request IRQ for MMC operations */
1038 ret = request_irq(host->irq, mmc_omap_irq, IRQF_DISABLED,
1039 mmc_hostname(mmc), host);
1041 dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
1045 /* initialize power supplies, gpios, etc */
1046 if (pdata->init != NULL) {
1047 if (pdata->init(&pdev->dev) != 0) {
1048 dev_dbg(mmc_dev(host->mmc), "late init error\n");
1049 goto err_irq_cd_init;
1052 mmc->ocr_avail = mmc_slot(host).ocr_mask;
1054 /* Request IRQ for card detect */
1055 if ((mmc_slot(host).card_detect_irq) && (mmc_slot(host).card_detect)) {
1056 ret = request_irq(mmc_slot(host).card_detect_irq,
1057 omap_mmc_cd_handler,
1058 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
1060 mmc_hostname(mmc), host);
1062 dev_dbg(mmc_dev(host->mmc),
1063 "Unable to grab MMC CD IRQ\n");
1068 OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
1069 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
1073 if (host->pdata->slots[host->slot_id].name != NULL) {
1074 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
1078 if (mmc_slot(host).card_detect_irq && mmc_slot(host).card_detect &&
1079 host->pdata->slots[host->slot_id].get_cover_state) {
1080 ret = device_create_file(&mmc->class_dev,
1081 &dev_attr_cover_switch);
1083 goto err_cover_switch;
1089 device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
1091 mmc_remove_host(mmc);
1093 free_irq(mmc_slot(host).card_detect_irq, host);
1095 free_irq(host->irq, host);
1097 clk_disable(host->fclk);
1098 clk_disable(host->iclk);
1099 clk_put(host->fclk);
1100 clk_put(host->iclk);
1101 if (host->dbclk_enabled) {
1102 clk_disable(host->dbclk);
1103 clk_put(host->dbclk);
1107 iounmap(host->base);
1109 dev_dbg(mmc_dev(host->mmc), "Probe Failed\n");
1110 release_mem_region(res->start, res->end - res->start + 1);
1116 static int omap_mmc_remove(struct platform_device *pdev)
1118 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1119 struct resource *res;
1122 mmc_remove_host(host->mmc);
1123 if (host->pdata->cleanup)
1124 host->pdata->cleanup(&pdev->dev);
1125 free_irq(host->irq, host);
1126 if (mmc_slot(host).card_detect_irq)
1127 free_irq(mmc_slot(host).card_detect_irq, host);
1128 flush_scheduled_work();
1130 clk_disable(host->fclk);
1131 clk_disable(host->iclk);
1132 clk_put(host->fclk);
1133 clk_put(host->iclk);
1134 if (host->dbclk_enabled) {
1135 clk_disable(host->dbclk);
1136 clk_put(host->dbclk);
1139 mmc_free_host(host->mmc);
1140 iounmap(host->base);
1143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1145 release_mem_region(res->start, res->end - res->start + 1);
1146 platform_set_drvdata(pdev, NULL);
1152 static int omap_mmc_suspend(struct platform_device *pdev, pm_message_t state)
1155 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1157 if (host && host->suspended)
1161 ret = mmc_suspend_host(host->mmc, state);
1163 host->suspended = 1;
1165 OMAP_HSMMC_WRITE(host->base, ISE, 0);
1166 OMAP_HSMMC_WRITE(host->base, IE, 0);
1168 if (host->pdata->suspend) {
1169 ret = host->pdata->suspend(&pdev->dev,
1172 dev_dbg(mmc_dev(host->mmc),
1173 "Unable to handle MMC board"
1174 " level suspend\n");
1177 if (host->id == OMAP_MMC1_DEVID
1178 && !(OMAP_HSMMC_READ(host->base, HCTL)
1180 OMAP_HSMMC_WRITE(host->base, HCTL,
1181 OMAP_HSMMC_READ(host->base, HCTL)
1183 OMAP_HSMMC_WRITE(host->base, HCTL,
1184 OMAP_HSMMC_READ(host->base, HCTL)
1186 OMAP_HSMMC_WRITE(host->base, HCTL,
1187 OMAP_HSMMC_READ(host->base, HCTL)
1191 clk_disable(host->fclk);
1192 clk_disable(host->iclk);
1193 clk_disable(host->dbclk);
1200 /* Routine to resume the MMC device */
1201 static int omap_mmc_resume(struct platform_device *pdev)
1204 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1206 if (host && !host->suspended)
1211 ret = clk_enable(host->fclk);
1215 ret = clk_enable(host->iclk);
1217 clk_disable(host->fclk);
1218 clk_put(host->fclk);
1222 if (clk_enable(host->dbclk) != 0)
1223 dev_dbg(mmc_dev(host->mmc),
1224 "Enabling debounce clk failed\n");
1226 if (host->pdata->resume) {
1227 ret = host->pdata->resume(&pdev->dev, host->slot_id);
1229 dev_dbg(mmc_dev(host->mmc),
1230 "Unmask interrupt failed\n");
1233 /* Notify the core to resume the host */
1234 ret = mmc_resume_host(host->mmc);
1236 host->suspended = 0;
1242 dev_dbg(mmc_dev(host->mmc),
1243 "Failed to enable MMC clocks during resume\n");
1248 #define omap_mmc_suspend NULL
1249 #define omap_mmc_resume NULL
1252 static struct platform_driver omap_mmc_driver = {
1253 .probe = omap_mmc_probe,
1254 .remove = omap_mmc_remove,
1255 .suspend = omap_mmc_suspend,
1256 .resume = omap_mmc_resume,
1258 .name = DRIVER_NAME,
1259 .owner = THIS_MODULE,
1263 static int __init omap_mmc_init(void)
1265 /* Register the MMC driver */
1266 return platform_driver_register(&omap_mmc_driver);
1269 static void __exit omap_mmc_cleanup(void)
1271 /* Unregister MMC driver */
1272 platform_driver_unregister(&omap_mmc_driver);
1275 module_init(omap_mmc_init);
1276 module_exit(omap_mmc_cleanup);
1278 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
1279 MODULE_LICENSE("GPL");
1280 MODULE_ALIAS("platform:" DRIVER_NAME);
1281 MODULE_AUTHOR("Texas Instruments Inc");