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1/*
2 * Freescale eSDHC i.MX controller driver for the platform bus.
3 *
4 * derived from the OF-version.
5 *
6 * Copyright (c) 2010 Pengutronix e.K.
7 * Author: Wolfram Sang <w.sang@pengutronix.de>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License.
12 */
13
14#include <linux/io.h>
15#include <linux/delay.h>
16#include <linux/err.h>
17#include <linux/clk.h>
18#include <linux/gpio.h>
19#include <linux/module.h>
20#include <linux/slab.h>
21#include <linux/mmc/host.h>
22#include <linux/mmc/mmc.h>
23#include <linux/mmc/sdio.h>
24#include <linux/of.h>
25#include <linux/of_device.h>
26#include <linux/of_gpio.h>
27#include <linux/pinctrl/consumer.h>
28#include <mach/esdhc.h>
29#include "sdhci-pltfm.h"
30#include "sdhci-esdhc.h"
31
32#define SDHCI_CTRL_D3CD 0x08
33/* VENDOR SPEC register */
34#define SDHCI_VENDOR_SPEC 0xC0
35#define SDHCI_VENDOR_SPEC_SDIO_QUIRK 0x00000002
36#define SDHCI_WTMK_LVL 0x44
37#define SDHCI_MIX_CTRL 0x48
38
39/*
40 * There is an INT DMA ERR mis-match between eSDHC and STD SDHC SPEC:
41 * Bit25 is used in STD SPEC, and is reserved in fsl eSDHC design,
42 * but bit28 is used as the INT DMA ERR in fsl eSDHC design.
43 * Define this macro DMA error INT for fsl eSDHC
44 */
45#define SDHCI_INT_VENDOR_SPEC_DMA_ERR 0x10000000
46
47/*
48 * The CMDTYPE of the CMD register (offset 0xE) should be set to
49 * "11" when the STOP CMD12 is issued on imx53 to abort one
50 * open ended multi-blk IO. Otherwise the TC INT wouldn't
51 * be generated.
52 * In exact block transfer, the controller doesn't complete the
53 * operations automatically as required at the end of the
54 * transfer and remains on hold if the abort command is not sent.
55 * As a result, the TC flag is not asserted and SW received timeout
56 * exeception. Bit1 of Vendor Spec registor is used to fix it.
57 */
58#define ESDHC_FLAG_MULTIBLK_NO_INT (1 << 1)
59
60enum imx_esdhc_type {
61 IMX25_ESDHC,
62 IMX35_ESDHC,
63 IMX51_ESDHC,
64 IMX53_ESDHC,
65 IMX6Q_USDHC,
66};
67
68struct pltfm_imx_data {
69 int flags;
70 u32 scratchpad;
71 enum imx_esdhc_type devtype;
72 struct pinctrl *pinctrl;
73 struct esdhc_platform_data boarddata;
74 struct clk *clk_ipg;
75 struct clk *clk_ahb;
76 struct clk *clk_per;
77};
78
79static struct platform_device_id imx_esdhc_devtype[] = {
80 {
81 .name = "sdhci-esdhc-imx25",
82 .driver_data = IMX25_ESDHC,
83 }, {
84 .name = "sdhci-esdhc-imx35",
85 .driver_data = IMX35_ESDHC,
86 }, {
87 .name = "sdhci-esdhc-imx51",
88 .driver_data = IMX51_ESDHC,
89 }, {
90 .name = "sdhci-esdhc-imx53",
91 .driver_data = IMX53_ESDHC,
92 }, {
93 .name = "sdhci-usdhc-imx6q",
94 .driver_data = IMX6Q_USDHC,
95 }, {
96 /* sentinel */
97 }
98};
99MODULE_DEVICE_TABLE(platform, imx_esdhc_devtype);
100
101static const struct of_device_id imx_esdhc_dt_ids[] = {
102 { .compatible = "fsl,imx25-esdhc", .data = &imx_esdhc_devtype[IMX25_ESDHC], },
103 { .compatible = "fsl,imx35-esdhc", .data = &imx_esdhc_devtype[IMX35_ESDHC], },
104 { .compatible = "fsl,imx51-esdhc", .data = &imx_esdhc_devtype[IMX51_ESDHC], },
105 { .compatible = "fsl,imx53-esdhc", .data = &imx_esdhc_devtype[IMX53_ESDHC], },
106 { .compatible = "fsl,imx6q-usdhc", .data = &imx_esdhc_devtype[IMX6Q_USDHC], },
107 { /* sentinel */ }
108};
109MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);
110
111static inline int is_imx25_esdhc(struct pltfm_imx_data *data)
112{
113 return data->devtype == IMX25_ESDHC;
114}
115
116static inline int is_imx35_esdhc(struct pltfm_imx_data *data)
117{
118 return data->devtype == IMX35_ESDHC;
119}
120
121static inline int is_imx51_esdhc(struct pltfm_imx_data *data)
122{
123 return data->devtype == IMX51_ESDHC;
124}
125
126static inline int is_imx53_esdhc(struct pltfm_imx_data *data)
127{
128 return data->devtype == IMX53_ESDHC;
129}
130
131static inline int is_imx6q_usdhc(struct pltfm_imx_data *data)
132{
133 return data->devtype == IMX6Q_USDHC;
134}
135
136static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg)
137{
138 void __iomem *base = host->ioaddr + (reg & ~0x3);
139 u32 shift = (reg & 0x3) * 8;
140
141 writel(((readl(base) & ~(mask << shift)) | (val << shift)), base);
142}
143
144static u32 esdhc_readl_le(struct sdhci_host *host, int reg)
145{
146 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
147 struct pltfm_imx_data *imx_data = pltfm_host->priv;
148 struct esdhc_platform_data *boarddata = &imx_data->boarddata;
149
150 /* fake CARD_PRESENT flag */
151 u32 val = readl(host->ioaddr + reg);
152
153 if (unlikely((reg == SDHCI_PRESENT_STATE)
154 && gpio_is_valid(boarddata->cd_gpio))) {
155 if (gpio_get_value(boarddata->cd_gpio))
156 /* no card, if a valid gpio says so... */
157 val &= ~SDHCI_CARD_PRESENT;
158 else
159 /* ... in all other cases assume card is present */
160 val |= SDHCI_CARD_PRESENT;
161 }
162
163 if (unlikely(reg == SDHCI_CAPABILITIES)) {
164 /* In FSL esdhc IC module, only bit20 is used to indicate the
165 * ADMA2 capability of esdhc, but this bit is messed up on
166 * some SOCs (e.g. on MX25, MX35 this bit is set, but they
167 * don't actually support ADMA2). So set the BROKEN_ADMA
168 * uirk on MX25/35 platforms.
169 */
170
171 if (val & SDHCI_CAN_DO_ADMA1) {
172 val &= ~SDHCI_CAN_DO_ADMA1;
173 val |= SDHCI_CAN_DO_ADMA2;
174 }
175 }
176
177 if (unlikely(reg == SDHCI_INT_STATUS)) {
178 if (val & SDHCI_INT_VENDOR_SPEC_DMA_ERR) {
179 val &= ~SDHCI_INT_VENDOR_SPEC_DMA_ERR;
180 val |= SDHCI_INT_ADMA_ERROR;
181 }
182 }
183
184 return val;
185}
186
187static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg)
188{
189 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
190 struct pltfm_imx_data *imx_data = pltfm_host->priv;
191 struct esdhc_platform_data *boarddata = &imx_data->boarddata;
192 u32 data;
193
194 if (unlikely(reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE)) {
195 if (boarddata->cd_type == ESDHC_CD_GPIO)
196 /*
197 * These interrupts won't work with a custom
198 * card_detect gpio (only applied to mx25/35)
199 */
200 val &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
201
202 if (val & SDHCI_INT_CARD_INT) {
203 /*
204 * Clear and then set D3CD bit to avoid missing the
205 * card interrupt. This is a eSDHC controller problem
206 * so we need to apply the following workaround: clear
207 * and set D3CD bit will make eSDHC re-sample the card
208 * interrupt. In case a card interrupt was lost,
209 * re-sample it by the following steps.
210 */
211 data = readl(host->ioaddr + SDHCI_HOST_CONTROL);
212 data &= ~SDHCI_CTRL_D3CD;
213 writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
214 data |= SDHCI_CTRL_D3CD;
215 writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
216 }
217 }
218
219 if (unlikely((imx_data->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
220 && (reg == SDHCI_INT_STATUS)
221 && (val & SDHCI_INT_DATA_END))) {
222 u32 v;
223 v = readl(host->ioaddr + SDHCI_VENDOR_SPEC);
224 v &= ~SDHCI_VENDOR_SPEC_SDIO_QUIRK;
225 writel(v, host->ioaddr + SDHCI_VENDOR_SPEC);
226 }
227
228 if (unlikely(reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE)) {
229 if (val & SDHCI_INT_ADMA_ERROR) {
230 val &= ~SDHCI_INT_ADMA_ERROR;
231 val |= SDHCI_INT_VENDOR_SPEC_DMA_ERR;
232 }
233 }
234
235 writel(val, host->ioaddr + reg);
236}
237
238static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
239{
240 if (unlikely(reg == SDHCI_HOST_VERSION)) {
241 u16 val = readw(host->ioaddr + (reg ^ 2));
242 /*
243 * uSDHC supports SDHCI v3.0, but it's encoded as value
244 * 0x3 in host controller version register, which violates
245 * SDHCI_SPEC_300 definition. Work it around here.
246 */
247 if ((val & SDHCI_SPEC_VER_MASK) == 3)
248 return --val;
249 }
250
251 return readw(host->ioaddr + reg);
252}
253
254static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
255{
256 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
257 struct pltfm_imx_data *imx_data = pltfm_host->priv;
258
259 switch (reg) {
260 case SDHCI_TRANSFER_MODE:
261 /*
262 * Postpone this write, we must do it together with a
263 * command write that is down below.
264 */
265 if ((imx_data->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
266 && (host->cmd->opcode == SD_IO_RW_EXTENDED)
267 && (host->cmd->data->blocks > 1)
268 && (host->cmd->data->flags & MMC_DATA_READ)) {
269 u32 v;
270 v = readl(host->ioaddr + SDHCI_VENDOR_SPEC);
271 v |= SDHCI_VENDOR_SPEC_SDIO_QUIRK;
272 writel(v, host->ioaddr + SDHCI_VENDOR_SPEC);
273 }
274 imx_data->scratchpad = val;
275 return;
276 case SDHCI_COMMAND:
277 if ((host->cmd->opcode == MMC_STOP_TRANSMISSION ||
278 host->cmd->opcode == MMC_SET_BLOCK_COUNT) &&
279 (imx_data->flags & ESDHC_FLAG_MULTIBLK_NO_INT))
280 val |= SDHCI_CMD_ABORTCMD;
281
282 if (is_imx6q_usdhc(imx_data)) {
283 u32 m = readl(host->ioaddr + SDHCI_MIX_CTRL);
284 m = imx_data->scratchpad | (m & 0xffff0000);
285 writel(m, host->ioaddr + SDHCI_MIX_CTRL);
286 writel(val << 16,
287 host->ioaddr + SDHCI_TRANSFER_MODE);
288 } else {
289 writel(val << 16 | imx_data->scratchpad,
290 host->ioaddr + SDHCI_TRANSFER_MODE);
291 }
292 return;
293 case SDHCI_BLOCK_SIZE:
294 val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
295 break;
296 }
297 esdhc_clrset_le(host, 0xffff, val, reg);
298}
299
300static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
301{
302 u32 new_val;
303
304 switch (reg) {
305 case SDHCI_POWER_CONTROL:
306 /*
307 * FSL put some DMA bits here
308 * If your board has a regulator, code should be here
309 */
310 return;
311 case SDHCI_HOST_CONTROL:
312 /* FSL messed up here, so we can just keep those three */
313 new_val = val & (SDHCI_CTRL_LED | \
314 SDHCI_CTRL_4BITBUS | \
315 SDHCI_CTRL_D3CD);
316 /* ensure the endianess */
317 new_val |= ESDHC_HOST_CONTROL_LE;
318 /* DMA mode bits are shifted */
319 new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5;
320
321 esdhc_clrset_le(host, 0xffff, new_val, reg);
322 return;
323 }
324 esdhc_clrset_le(host, 0xff, val, reg);
325
326 /*
327 * The esdhc has a design violation to SDHC spec which tells
328 * that software reset should not affect card detection circuit.
329 * But esdhc clears its SYSCTL register bits [0..2] during the
330 * software reset. This will stop those clocks that card detection
331 * circuit relies on. To work around it, we turn the clocks on back
332 * to keep card detection circuit functional.
333 */
334 if ((reg == SDHCI_SOFTWARE_RESET) && (val & 1))
335 esdhc_clrset_le(host, 0x7, 0x7, ESDHC_SYSTEM_CONTROL);
336}
337
338static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host)
339{
340 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
341
342 return clk_get_rate(pltfm_host->clk);
343}
344
345static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
346{
347 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
348
349 return clk_get_rate(pltfm_host->clk) / 256 / 16;
350}
351
352static unsigned int esdhc_pltfm_get_ro(struct sdhci_host *host)
353{
354 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
355 struct pltfm_imx_data *imx_data = pltfm_host->priv;
356 struct esdhc_platform_data *boarddata = &imx_data->boarddata;
357
358 switch (boarddata->wp_type) {
359 case ESDHC_WP_GPIO:
360 if (gpio_is_valid(boarddata->wp_gpio))
361 return gpio_get_value(boarddata->wp_gpio);
362 case ESDHC_WP_CONTROLLER:
363 return !(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
364 SDHCI_WRITE_PROTECT);
365 case ESDHC_WP_NONE:
366 break;
367 }
368
369 return -ENOSYS;
370}
371
372static struct sdhci_ops sdhci_esdhc_ops = {
373 .read_l = esdhc_readl_le,
374 .read_w = esdhc_readw_le,
375 .write_l = esdhc_writel_le,
376 .write_w = esdhc_writew_le,
377 .write_b = esdhc_writeb_le,
378 .set_clock = esdhc_set_clock,
379 .get_max_clock = esdhc_pltfm_get_max_clock,
380 .get_min_clock = esdhc_pltfm_get_min_clock,
381 .get_ro = esdhc_pltfm_get_ro,
382};
383
384static struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
385 .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_NO_HISPD_BIT
386 | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
387 | SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC
388 | SDHCI_QUIRK_BROKEN_CARD_DETECTION,
389 .ops = &sdhci_esdhc_ops,
390};
391
392static irqreturn_t cd_irq(int irq, void *data)
393{
394 struct sdhci_host *sdhost = (struct sdhci_host *)data;
395
396 tasklet_schedule(&sdhost->card_tasklet);
397 return IRQ_HANDLED;
398};
399
400#ifdef CONFIG_OF
401static int __devinit
402sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
403 struct esdhc_platform_data *boarddata)
404{
405 struct device_node *np = pdev->dev.of_node;
406
407 if (!np)
408 return -ENODEV;
409
410 if (of_get_property(np, "non-removable", NULL))
411 boarddata->cd_type = ESDHC_CD_PERMANENT;
412
413 if (of_get_property(np, "fsl,cd-controller", NULL))
414 boarddata->cd_type = ESDHC_CD_CONTROLLER;
415
416 if (of_get_property(np, "fsl,wp-controller", NULL))
417 boarddata->wp_type = ESDHC_WP_CONTROLLER;
418
419 boarddata->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
420 if (gpio_is_valid(boarddata->cd_gpio))
421 boarddata->cd_type = ESDHC_CD_GPIO;
422
423 boarddata->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
424 if (gpio_is_valid(boarddata->wp_gpio))
425 boarddata->wp_type = ESDHC_WP_GPIO;
426
427 return 0;
428}
429#else
430static inline int
431sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
432 struct esdhc_platform_data *boarddata)
433{
434 return -ENODEV;
435}
436#endif
437
438static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
439{
440 const struct of_device_id *of_id =
441 of_match_device(imx_esdhc_dt_ids, &pdev->dev);
442 struct sdhci_pltfm_host *pltfm_host;
443 struct sdhci_host *host;
444 struct esdhc_platform_data *boarddata;
445 int err;
446 struct pltfm_imx_data *imx_data;
447
448 host = sdhci_pltfm_init(pdev, &sdhci_esdhc_imx_pdata);
449 if (IS_ERR(host))
450 return PTR_ERR(host);
451
452 pltfm_host = sdhci_priv(host);
453
454 imx_data = kzalloc(sizeof(struct pltfm_imx_data), GFP_KERNEL);
455 if (!imx_data) {
456 err = -ENOMEM;
457 goto err_imx_data;
458 }
459
460 if (of_id)
461 pdev->id_entry = of_id->data;
462 imx_data->devtype = pdev->id_entry->driver_data;
463 pltfm_host->priv = imx_data;
464
465 imx_data->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
466 if (IS_ERR(imx_data->clk_ipg)) {
467 err = PTR_ERR(imx_data->clk_ipg);
468 goto err_clk_get;
469 }
470
471 imx_data->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
472 if (IS_ERR(imx_data->clk_ahb)) {
473 err = PTR_ERR(imx_data->clk_ahb);
474 goto err_clk_get;
475 }
476
477 imx_data->clk_per = devm_clk_get(&pdev->dev, "per");
478 if (IS_ERR(imx_data->clk_per)) {
479 err = PTR_ERR(imx_data->clk_per);
480 goto err_clk_get;
481 }
482
483 pltfm_host->clk = imx_data->clk_per;
484
485 clk_prepare_enable(imx_data->clk_per);
486 clk_prepare_enable(imx_data->clk_ipg);
487 clk_prepare_enable(imx_data->clk_ahb);
488
489 imx_data->pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
490 if (IS_ERR(imx_data->pinctrl)) {
491 err = PTR_ERR(imx_data->pinctrl);
492 goto pin_err;
493 }
494
495 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
496
497 if (is_imx25_esdhc(imx_data) || is_imx35_esdhc(imx_data))
498 /* Fix errata ENGcm07207 present on i.MX25 and i.MX35 */
499 host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK
500 | SDHCI_QUIRK_BROKEN_ADMA;
501
502 if (is_imx53_esdhc(imx_data))
503 imx_data->flags |= ESDHC_FLAG_MULTIBLK_NO_INT;
504
505 /*
506 * The imx6q ROM code will change the default watermark level setting
507 * to something insane. Change it back here.
508 */
509 if (is_imx6q_usdhc(imx_data))
510 writel(0x08100810, host->ioaddr + SDHCI_WTMK_LVL);
511
512 boarddata = &imx_data->boarddata;
513 if (sdhci_esdhc_imx_probe_dt(pdev, boarddata) < 0) {
514 if (!host->mmc->parent->platform_data) {
515 dev_err(mmc_dev(host->mmc), "no board data!\n");
516 err = -EINVAL;
517 goto no_board_data;
518 }
519 imx_data->boarddata = *((struct esdhc_platform_data *)
520 host->mmc->parent->platform_data);
521 }
522
523 /* write_protect */
524 if (boarddata->wp_type == ESDHC_WP_GPIO) {
525 err = gpio_request_one(boarddata->wp_gpio, GPIOF_IN, "ESDHC_WP");
526 if (err) {
527 dev_warn(mmc_dev(host->mmc),
528 "no write-protect pin available!\n");
529 boarddata->wp_gpio = -EINVAL;
530 }
531 } else {
532 boarddata->wp_gpio = -EINVAL;
533 }
534
535 /* card_detect */
536 if (boarddata->cd_type != ESDHC_CD_GPIO)
537 boarddata->cd_gpio = -EINVAL;
538
539 switch (boarddata->cd_type) {
540 case ESDHC_CD_GPIO:
541 err = gpio_request_one(boarddata->cd_gpio, GPIOF_IN, "ESDHC_CD");
542 if (err) {
543 dev_err(mmc_dev(host->mmc),
544 "no card-detect pin available!\n");
545 goto no_card_detect_pin;
546 }
547
548 err = request_irq(gpio_to_irq(boarddata->cd_gpio), cd_irq,
549 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
550 mmc_hostname(host->mmc), host);
551 if (err) {
552 dev_err(mmc_dev(host->mmc), "request irq error\n");
553 goto no_card_detect_irq;
554 }
555 /* fall through */
556
557 case ESDHC_CD_CONTROLLER:
558 /* we have a working card_detect back */
559 host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
560 break;
561
562 case ESDHC_CD_PERMANENT:
563 host->mmc->caps = MMC_CAP_NONREMOVABLE;
564 break;
565
566 case ESDHC_CD_NONE:
567 break;
568 }
569
570 err = sdhci_add_host(host);
571 if (err)
572 goto err_add_host;
573
574 return 0;
575
576err_add_host:
577 if (gpio_is_valid(boarddata->cd_gpio))
578 free_irq(gpio_to_irq(boarddata->cd_gpio), host);
579no_card_detect_irq:
580 if (gpio_is_valid(boarddata->cd_gpio))
581 gpio_free(boarddata->cd_gpio);
582 if (gpio_is_valid(boarddata->wp_gpio))
583 gpio_free(boarddata->wp_gpio);
584no_card_detect_pin:
585no_board_data:
586pin_err:
587 clk_disable_unprepare(imx_data->clk_per);
588 clk_disable_unprepare(imx_data->clk_ipg);
589 clk_disable_unprepare(imx_data->clk_ahb);
590err_clk_get:
591 kfree(imx_data);
592err_imx_data:
593 sdhci_pltfm_free(pdev);
594 return err;
595}
596
597static int __devexit sdhci_esdhc_imx_remove(struct platform_device *pdev)
598{
599 struct sdhci_host *host = platform_get_drvdata(pdev);
600 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
601 struct pltfm_imx_data *imx_data = pltfm_host->priv;
602 struct esdhc_platform_data *boarddata = &imx_data->boarddata;
603 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
604
605 sdhci_remove_host(host, dead);
606
607 if (gpio_is_valid(boarddata->wp_gpio))
608 gpio_free(boarddata->wp_gpio);
609
610 if (gpio_is_valid(boarddata->cd_gpio)) {
611 free_irq(gpio_to_irq(boarddata->cd_gpio), host);
612 gpio_free(boarddata->cd_gpio);
613 }
614
615 clk_disable_unprepare(imx_data->clk_per);
616 clk_disable_unprepare(imx_data->clk_ipg);
617 clk_disable_unprepare(imx_data->clk_ahb);
618
619 kfree(imx_data);
620
621 sdhci_pltfm_free(pdev);
622
623 return 0;
624}
625
626static struct platform_driver sdhci_esdhc_imx_driver = {
627 .driver = {
628 .name = "sdhci-esdhc-imx",
629 .owner = THIS_MODULE,
630 .of_match_table = imx_esdhc_dt_ids,
631 .pm = SDHCI_PLTFM_PMOPS,
632 },
633 .id_table = imx_esdhc_devtype,
634 .probe = sdhci_esdhc_imx_probe,
635 .remove = __devexit_p(sdhci_esdhc_imx_remove),
636};
637
638module_platform_driver(sdhci_esdhc_imx_driver);
639
640MODULE_DESCRIPTION("SDHCI driver for Freescale i.MX eSDHC");
641MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
642MODULE_LICENSE("GPL v2");
1/*
2 * Freescale eSDHC i.MX controller driver for the platform bus.
3 *
4 * derived from the OF-version.
5 *
6 * Copyright (c) 2010 Pengutronix e.K.
7 * Author: Wolfram Sang <kernel@pengutronix.de>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License.
12 */
13
14#include <linux/io.h>
15#include <linux/delay.h>
16#include <linux/err.h>
17#include <linux/clk.h>
18#include <linux/gpio.h>
19#include <linux/module.h>
20#include <linux/slab.h>
21#include <linux/mmc/host.h>
22#include <linux/mmc/mmc.h>
23#include <linux/mmc/sdio.h>
24#include <linux/mmc/slot-gpio.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27#include <linux/of_gpio.h>
28#include <linux/pinctrl/consumer.h>
29#include <linux/platform_data/mmc-esdhc-imx.h>
30#include <linux/pm_runtime.h>
31#include "sdhci-pltfm.h"
32#include "sdhci-esdhc.h"
33
34#define ESDHC_SYS_CTRL_DTOCV_MASK 0x0f
35#define ESDHC_CTRL_D3CD 0x08
36#define ESDHC_BURST_LEN_EN_INCR (1 << 27)
37/* VENDOR SPEC register */
38#define ESDHC_VENDOR_SPEC 0xc0
39#define ESDHC_VENDOR_SPEC_SDIO_QUIRK (1 << 1)
40#define ESDHC_VENDOR_SPEC_VSELECT (1 << 1)
41#define ESDHC_VENDOR_SPEC_FRC_SDCLK_ON (1 << 8)
42#define ESDHC_WTMK_LVL 0x44
43#define ESDHC_WTMK_DEFAULT_VAL 0x10401040
44#define ESDHC_MIX_CTRL 0x48
45#define ESDHC_MIX_CTRL_DDREN (1 << 3)
46#define ESDHC_MIX_CTRL_AC23EN (1 << 7)
47#define ESDHC_MIX_CTRL_EXE_TUNE (1 << 22)
48#define ESDHC_MIX_CTRL_SMPCLK_SEL (1 << 23)
49#define ESDHC_MIX_CTRL_AUTO_TUNE_EN (1 << 24)
50#define ESDHC_MIX_CTRL_FBCLK_SEL (1 << 25)
51#define ESDHC_MIX_CTRL_HS400_EN (1 << 26)
52/* Bits 3 and 6 are not SDHCI standard definitions */
53#define ESDHC_MIX_CTRL_SDHCI_MASK 0xb7
54/* Tuning bits */
55#define ESDHC_MIX_CTRL_TUNING_MASK 0x03c00000
56
57/* dll control register */
58#define ESDHC_DLL_CTRL 0x60
59#define ESDHC_DLL_OVERRIDE_VAL_SHIFT 9
60#define ESDHC_DLL_OVERRIDE_EN_SHIFT 8
61
62/* tune control register */
63#define ESDHC_TUNE_CTRL_STATUS 0x68
64#define ESDHC_TUNE_CTRL_STEP 1
65#define ESDHC_TUNE_CTRL_MIN 0
66#define ESDHC_TUNE_CTRL_MAX ((1 << 7) - 1)
67
68/* strobe dll register */
69#define ESDHC_STROBE_DLL_CTRL 0x70
70#define ESDHC_STROBE_DLL_CTRL_ENABLE (1 << 0)
71#define ESDHC_STROBE_DLL_CTRL_RESET (1 << 1)
72#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT 3
73
74#define ESDHC_STROBE_DLL_STATUS 0x74
75#define ESDHC_STROBE_DLL_STS_REF_LOCK (1 << 1)
76#define ESDHC_STROBE_DLL_STS_SLV_LOCK 0x1
77
78#define ESDHC_TUNING_CTRL 0xcc
79#define ESDHC_STD_TUNING_EN (1 << 24)
80/* NOTE: the minimum valid tuning start tap for mx6sl is 1 */
81#define ESDHC_TUNING_START_TAP_DEFAULT 0x1
82#define ESDHC_TUNING_START_TAP_MASK 0xff
83#define ESDHC_TUNING_STEP_MASK 0x00070000
84#define ESDHC_TUNING_STEP_SHIFT 16
85
86/* pinctrl state */
87#define ESDHC_PINCTRL_STATE_100MHZ "state_100mhz"
88#define ESDHC_PINCTRL_STATE_200MHZ "state_200mhz"
89
90/*
91 * Our interpretation of the SDHCI_HOST_CONTROL register
92 */
93#define ESDHC_CTRL_4BITBUS (0x1 << 1)
94#define ESDHC_CTRL_8BITBUS (0x2 << 1)
95#define ESDHC_CTRL_BUSWIDTH_MASK (0x3 << 1)
96
97/*
98 * There is an INT DMA ERR mis-match between eSDHC and STD SDHC SPEC:
99 * Bit25 is used in STD SPEC, and is reserved in fsl eSDHC design,
100 * but bit28 is used as the INT DMA ERR in fsl eSDHC design.
101 * Define this macro DMA error INT for fsl eSDHC
102 */
103#define ESDHC_INT_VENDOR_SPEC_DMA_ERR (1 << 28)
104
105/*
106 * The CMDTYPE of the CMD register (offset 0xE) should be set to
107 * "11" when the STOP CMD12 is issued on imx53 to abort one
108 * open ended multi-blk IO. Otherwise the TC INT wouldn't
109 * be generated.
110 * In exact block transfer, the controller doesn't complete the
111 * operations automatically as required at the end of the
112 * transfer and remains on hold if the abort command is not sent.
113 * As a result, the TC flag is not asserted and SW received timeout
114 * exeception. Bit1 of Vendor Spec registor is used to fix it.
115 */
116#define ESDHC_FLAG_MULTIBLK_NO_INT BIT(1)
117/*
118 * The flag enables the workaround for ESDHC errata ENGcm07207 which
119 * affects i.MX25 and i.MX35.
120 */
121#define ESDHC_FLAG_ENGCM07207 BIT(2)
122/*
123 * The flag tells that the ESDHC controller is an USDHC block that is
124 * integrated on the i.MX6 series.
125 */
126#define ESDHC_FLAG_USDHC BIT(3)
127/* The IP supports manual tuning process */
128#define ESDHC_FLAG_MAN_TUNING BIT(4)
129/* The IP supports standard tuning process */
130#define ESDHC_FLAG_STD_TUNING BIT(5)
131/* The IP has SDHCI_CAPABILITIES_1 register */
132#define ESDHC_FLAG_HAVE_CAP1 BIT(6)
133/*
134 * The IP has errata ERR004536
135 * uSDHC: ADMA Length Mismatch Error occurs if the AHB read access is slow,
136 * when reading data from the card
137 */
138#define ESDHC_FLAG_ERR004536 BIT(7)
139/* The IP supports HS200 mode */
140#define ESDHC_FLAG_HS200 BIT(8)
141/* The IP supports HS400 mode */
142#define ESDHC_FLAG_HS400 BIT(9)
143
144/* A higher clock ferquency than this rate requires strobell dll control */
145#define ESDHC_STROBE_DLL_CLK_FREQ 100000000
146
147struct esdhc_soc_data {
148 u32 flags;
149};
150
151static struct esdhc_soc_data esdhc_imx25_data = {
152 .flags = ESDHC_FLAG_ENGCM07207,
153};
154
155static struct esdhc_soc_data esdhc_imx35_data = {
156 .flags = ESDHC_FLAG_ENGCM07207,
157};
158
159static struct esdhc_soc_data esdhc_imx51_data = {
160 .flags = 0,
161};
162
163static struct esdhc_soc_data esdhc_imx53_data = {
164 .flags = ESDHC_FLAG_MULTIBLK_NO_INT,
165};
166
167static struct esdhc_soc_data usdhc_imx6q_data = {
168 .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING,
169};
170
171static struct esdhc_soc_data usdhc_imx6sl_data = {
172 .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
173 | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_ERR004536
174 | ESDHC_FLAG_HS200,
175};
176
177static struct esdhc_soc_data usdhc_imx6sx_data = {
178 .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
179 | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200,
180};
181
182static struct esdhc_soc_data usdhc_imx7d_data = {
183 .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
184 | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
185 | ESDHC_FLAG_HS400,
186};
187
188struct pltfm_imx_data {
189 u32 scratchpad;
190 struct pinctrl *pinctrl;
191 struct pinctrl_state *pins_default;
192 struct pinctrl_state *pins_100mhz;
193 struct pinctrl_state *pins_200mhz;
194 const struct esdhc_soc_data *socdata;
195 struct esdhc_platform_data boarddata;
196 struct clk *clk_ipg;
197 struct clk *clk_ahb;
198 struct clk *clk_per;
199 enum {
200 NO_CMD_PENDING, /* no multiblock command pending*/
201 MULTIBLK_IN_PROCESS, /* exact multiblock cmd in process */
202 WAIT_FOR_INT, /* sent CMD12, waiting for response INT */
203 } multiblock_status;
204 u32 is_ddr;
205};
206
207static const struct platform_device_id imx_esdhc_devtype[] = {
208 {
209 .name = "sdhci-esdhc-imx25",
210 .driver_data = (kernel_ulong_t) &esdhc_imx25_data,
211 }, {
212 .name = "sdhci-esdhc-imx35",
213 .driver_data = (kernel_ulong_t) &esdhc_imx35_data,
214 }, {
215 .name = "sdhci-esdhc-imx51",
216 .driver_data = (kernel_ulong_t) &esdhc_imx51_data,
217 }, {
218 /* sentinel */
219 }
220};
221MODULE_DEVICE_TABLE(platform, imx_esdhc_devtype);
222
223static const struct of_device_id imx_esdhc_dt_ids[] = {
224 { .compatible = "fsl,imx25-esdhc", .data = &esdhc_imx25_data, },
225 { .compatible = "fsl,imx35-esdhc", .data = &esdhc_imx35_data, },
226 { .compatible = "fsl,imx51-esdhc", .data = &esdhc_imx51_data, },
227 { .compatible = "fsl,imx53-esdhc", .data = &esdhc_imx53_data, },
228 { .compatible = "fsl,imx6sx-usdhc", .data = &usdhc_imx6sx_data, },
229 { .compatible = "fsl,imx6sl-usdhc", .data = &usdhc_imx6sl_data, },
230 { .compatible = "fsl,imx6q-usdhc", .data = &usdhc_imx6q_data, },
231 { .compatible = "fsl,imx7d-usdhc", .data = &usdhc_imx7d_data, },
232 { /* sentinel */ }
233};
234MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);
235
236static inline int is_imx25_esdhc(struct pltfm_imx_data *data)
237{
238 return data->socdata == &esdhc_imx25_data;
239}
240
241static inline int is_imx53_esdhc(struct pltfm_imx_data *data)
242{
243 return data->socdata == &esdhc_imx53_data;
244}
245
246static inline int is_imx6q_usdhc(struct pltfm_imx_data *data)
247{
248 return data->socdata == &usdhc_imx6q_data;
249}
250
251static inline int esdhc_is_usdhc(struct pltfm_imx_data *data)
252{
253 return !!(data->socdata->flags & ESDHC_FLAG_USDHC);
254}
255
256static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg)
257{
258 void __iomem *base = host->ioaddr + (reg & ~0x3);
259 u32 shift = (reg & 0x3) * 8;
260
261 writel(((readl(base) & ~(mask << shift)) | (val << shift)), base);
262}
263
264static u32 esdhc_readl_le(struct sdhci_host *host, int reg)
265{
266 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
267 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
268 u32 val = readl(host->ioaddr + reg);
269
270 if (unlikely(reg == SDHCI_PRESENT_STATE)) {
271 u32 fsl_prss = val;
272 /* save the least 20 bits */
273 val = fsl_prss & 0x000FFFFF;
274 /* move dat[0-3] bits */
275 val |= (fsl_prss & 0x0F000000) >> 4;
276 /* move cmd line bit */
277 val |= (fsl_prss & 0x00800000) << 1;
278 }
279
280 if (unlikely(reg == SDHCI_CAPABILITIES)) {
281 /* ignore bit[0-15] as it stores cap_1 register val for mx6sl */
282 if (imx_data->socdata->flags & ESDHC_FLAG_HAVE_CAP1)
283 val &= 0xffff0000;
284
285 /* In FSL esdhc IC module, only bit20 is used to indicate the
286 * ADMA2 capability of esdhc, but this bit is messed up on
287 * some SOCs (e.g. on MX25, MX35 this bit is set, but they
288 * don't actually support ADMA2). So set the BROKEN_ADMA
289 * uirk on MX25/35 platforms.
290 */
291
292 if (val & SDHCI_CAN_DO_ADMA1) {
293 val &= ~SDHCI_CAN_DO_ADMA1;
294 val |= SDHCI_CAN_DO_ADMA2;
295 }
296 }
297
298 if (unlikely(reg == SDHCI_CAPABILITIES_1)) {
299 if (esdhc_is_usdhc(imx_data)) {
300 if (imx_data->socdata->flags & ESDHC_FLAG_HAVE_CAP1)
301 val = readl(host->ioaddr + SDHCI_CAPABILITIES) & 0xFFFF;
302 else
303 /* imx6q/dl does not have cap_1 register, fake one */
304 val = SDHCI_SUPPORT_DDR50 | SDHCI_SUPPORT_SDR104
305 | SDHCI_SUPPORT_SDR50
306 | SDHCI_USE_SDR50_TUNING
307 | (SDHCI_TUNING_MODE_3 << SDHCI_RETUNING_MODE_SHIFT);
308
309 if (imx_data->socdata->flags & ESDHC_FLAG_HS400)
310 val |= SDHCI_SUPPORT_HS400;
311 }
312 }
313
314 if (unlikely(reg == SDHCI_MAX_CURRENT) && esdhc_is_usdhc(imx_data)) {
315 val = 0;
316 val |= 0xFF << SDHCI_MAX_CURRENT_330_SHIFT;
317 val |= 0xFF << SDHCI_MAX_CURRENT_300_SHIFT;
318 val |= 0xFF << SDHCI_MAX_CURRENT_180_SHIFT;
319 }
320
321 if (unlikely(reg == SDHCI_INT_STATUS)) {
322 if (val & ESDHC_INT_VENDOR_SPEC_DMA_ERR) {
323 val &= ~ESDHC_INT_VENDOR_SPEC_DMA_ERR;
324 val |= SDHCI_INT_ADMA_ERROR;
325 }
326
327 /*
328 * mask off the interrupt we get in response to the manually
329 * sent CMD12
330 */
331 if ((imx_data->multiblock_status == WAIT_FOR_INT) &&
332 ((val & SDHCI_INT_RESPONSE) == SDHCI_INT_RESPONSE)) {
333 val &= ~SDHCI_INT_RESPONSE;
334 writel(SDHCI_INT_RESPONSE, host->ioaddr +
335 SDHCI_INT_STATUS);
336 imx_data->multiblock_status = NO_CMD_PENDING;
337 }
338 }
339
340 return val;
341}
342
343static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg)
344{
345 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
346 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
347 u32 data;
348
349 if (unlikely(reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE ||
350 reg == SDHCI_INT_STATUS)) {
351 if ((val & SDHCI_INT_CARD_INT) && !esdhc_is_usdhc(imx_data)) {
352 /*
353 * Clear and then set D3CD bit to avoid missing the
354 * card interrupt. This is a eSDHC controller problem
355 * so we need to apply the following workaround: clear
356 * and set D3CD bit will make eSDHC re-sample the card
357 * interrupt. In case a card interrupt was lost,
358 * re-sample it by the following steps.
359 */
360 data = readl(host->ioaddr + SDHCI_HOST_CONTROL);
361 data &= ~ESDHC_CTRL_D3CD;
362 writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
363 data |= ESDHC_CTRL_D3CD;
364 writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
365 }
366
367 if (val & SDHCI_INT_ADMA_ERROR) {
368 val &= ~SDHCI_INT_ADMA_ERROR;
369 val |= ESDHC_INT_VENDOR_SPEC_DMA_ERR;
370 }
371 }
372
373 if (unlikely((imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
374 && (reg == SDHCI_INT_STATUS)
375 && (val & SDHCI_INT_DATA_END))) {
376 u32 v;
377 v = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
378 v &= ~ESDHC_VENDOR_SPEC_SDIO_QUIRK;
379 writel(v, host->ioaddr + ESDHC_VENDOR_SPEC);
380
381 if (imx_data->multiblock_status == MULTIBLK_IN_PROCESS)
382 {
383 /* send a manual CMD12 with RESPTYP=none */
384 data = MMC_STOP_TRANSMISSION << 24 |
385 SDHCI_CMD_ABORTCMD << 16;
386 writel(data, host->ioaddr + SDHCI_TRANSFER_MODE);
387 imx_data->multiblock_status = WAIT_FOR_INT;
388 }
389 }
390
391 writel(val, host->ioaddr + reg);
392}
393
394static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
395{
396 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
397 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
398 u16 ret = 0;
399 u32 val;
400
401 if (unlikely(reg == SDHCI_HOST_VERSION)) {
402 reg ^= 2;
403 if (esdhc_is_usdhc(imx_data)) {
404 /*
405 * The usdhc register returns a wrong host version.
406 * Correct it here.
407 */
408 return SDHCI_SPEC_300;
409 }
410 }
411
412 if (unlikely(reg == SDHCI_HOST_CONTROL2)) {
413 val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
414 if (val & ESDHC_VENDOR_SPEC_VSELECT)
415 ret |= SDHCI_CTRL_VDD_180;
416
417 if (esdhc_is_usdhc(imx_data)) {
418 if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
419 val = readl(host->ioaddr + ESDHC_MIX_CTRL);
420 else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING)
421 /* the std tuning bits is in ACMD12_ERR for imx6sl */
422 val = readl(host->ioaddr + SDHCI_ACMD12_ERR);
423 }
424
425 if (val & ESDHC_MIX_CTRL_EXE_TUNE)
426 ret |= SDHCI_CTRL_EXEC_TUNING;
427 if (val & ESDHC_MIX_CTRL_SMPCLK_SEL)
428 ret |= SDHCI_CTRL_TUNED_CLK;
429
430 ret &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
431
432 return ret;
433 }
434
435 if (unlikely(reg == SDHCI_TRANSFER_MODE)) {
436 if (esdhc_is_usdhc(imx_data)) {
437 u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
438 ret = m & ESDHC_MIX_CTRL_SDHCI_MASK;
439 /* Swap AC23 bit */
440 if (m & ESDHC_MIX_CTRL_AC23EN) {
441 ret &= ~ESDHC_MIX_CTRL_AC23EN;
442 ret |= SDHCI_TRNS_AUTO_CMD23;
443 }
444 } else {
445 ret = readw(host->ioaddr + SDHCI_TRANSFER_MODE);
446 }
447
448 return ret;
449 }
450
451 return readw(host->ioaddr + reg);
452}
453
454static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
455{
456 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
457 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
458 u32 new_val = 0;
459
460 switch (reg) {
461 case SDHCI_CLOCK_CONTROL:
462 new_val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
463 if (val & SDHCI_CLOCK_CARD_EN)
464 new_val |= ESDHC_VENDOR_SPEC_FRC_SDCLK_ON;
465 else
466 new_val &= ~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON;
467 writel(new_val, host->ioaddr + ESDHC_VENDOR_SPEC);
468 return;
469 case SDHCI_HOST_CONTROL2:
470 new_val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
471 if (val & SDHCI_CTRL_VDD_180)
472 new_val |= ESDHC_VENDOR_SPEC_VSELECT;
473 else
474 new_val &= ~ESDHC_VENDOR_SPEC_VSELECT;
475 writel(new_val, host->ioaddr + ESDHC_VENDOR_SPEC);
476 if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
477 new_val = readl(host->ioaddr + ESDHC_MIX_CTRL);
478 if (val & SDHCI_CTRL_TUNED_CLK) {
479 new_val |= ESDHC_MIX_CTRL_SMPCLK_SEL;
480 new_val |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
481 } else {
482 new_val &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
483 new_val &= ~ESDHC_MIX_CTRL_AUTO_TUNE_EN;
484 }
485 writel(new_val , host->ioaddr + ESDHC_MIX_CTRL);
486 } else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
487 u32 v = readl(host->ioaddr + SDHCI_ACMD12_ERR);
488 u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
489 if (val & SDHCI_CTRL_TUNED_CLK) {
490 v |= ESDHC_MIX_CTRL_SMPCLK_SEL;
491 } else {
492 v &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
493 m &= ~ESDHC_MIX_CTRL_FBCLK_SEL;
494 m &= ~ESDHC_MIX_CTRL_AUTO_TUNE_EN;
495 }
496
497 if (val & SDHCI_CTRL_EXEC_TUNING) {
498 v |= ESDHC_MIX_CTRL_EXE_TUNE;
499 m |= ESDHC_MIX_CTRL_FBCLK_SEL;
500 m |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
501 } else {
502 v &= ~ESDHC_MIX_CTRL_EXE_TUNE;
503 }
504
505 writel(v, host->ioaddr + SDHCI_ACMD12_ERR);
506 writel(m, host->ioaddr + ESDHC_MIX_CTRL);
507 }
508 return;
509 case SDHCI_TRANSFER_MODE:
510 if ((imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
511 && (host->cmd->opcode == SD_IO_RW_EXTENDED)
512 && (host->cmd->data->blocks > 1)
513 && (host->cmd->data->flags & MMC_DATA_READ)) {
514 u32 v;
515 v = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
516 v |= ESDHC_VENDOR_SPEC_SDIO_QUIRK;
517 writel(v, host->ioaddr + ESDHC_VENDOR_SPEC);
518 }
519
520 if (esdhc_is_usdhc(imx_data)) {
521 u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
522 /* Swap AC23 bit */
523 if (val & SDHCI_TRNS_AUTO_CMD23) {
524 val &= ~SDHCI_TRNS_AUTO_CMD23;
525 val |= ESDHC_MIX_CTRL_AC23EN;
526 }
527 m = val | (m & ~ESDHC_MIX_CTRL_SDHCI_MASK);
528 writel(m, host->ioaddr + ESDHC_MIX_CTRL);
529 } else {
530 /*
531 * Postpone this write, we must do it together with a
532 * command write that is down below.
533 */
534 imx_data->scratchpad = val;
535 }
536 return;
537 case SDHCI_COMMAND:
538 if (host->cmd->opcode == MMC_STOP_TRANSMISSION)
539 val |= SDHCI_CMD_ABORTCMD;
540
541 if ((host->cmd->opcode == MMC_SET_BLOCK_COUNT) &&
542 (imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT))
543 imx_data->multiblock_status = MULTIBLK_IN_PROCESS;
544
545 if (esdhc_is_usdhc(imx_data))
546 writel(val << 16,
547 host->ioaddr + SDHCI_TRANSFER_MODE);
548 else
549 writel(val << 16 | imx_data->scratchpad,
550 host->ioaddr + SDHCI_TRANSFER_MODE);
551 return;
552 case SDHCI_BLOCK_SIZE:
553 val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
554 break;
555 }
556 esdhc_clrset_le(host, 0xffff, val, reg);
557}
558
559static u8 esdhc_readb_le(struct sdhci_host *host, int reg)
560{
561 u8 ret;
562 u32 val;
563
564 switch (reg) {
565 case SDHCI_HOST_CONTROL:
566 val = readl(host->ioaddr + reg);
567
568 ret = val & SDHCI_CTRL_LED;
569 ret |= (val >> 5) & SDHCI_CTRL_DMA_MASK;
570 ret |= (val & ESDHC_CTRL_4BITBUS);
571 ret |= (val & ESDHC_CTRL_8BITBUS) << 3;
572 return ret;
573 }
574
575 return readb(host->ioaddr + reg);
576}
577
578static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
579{
580 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
581 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
582 u32 new_val;
583 u32 mask;
584
585 switch (reg) {
586 case SDHCI_POWER_CONTROL:
587 /*
588 * FSL put some DMA bits here
589 * If your board has a regulator, code should be here
590 */
591 return;
592 case SDHCI_HOST_CONTROL:
593 /* FSL messed up here, so we need to manually compose it. */
594 new_val = val & SDHCI_CTRL_LED;
595 /* ensure the endianness */
596 new_val |= ESDHC_HOST_CONTROL_LE;
597 /* bits 8&9 are reserved on mx25 */
598 if (!is_imx25_esdhc(imx_data)) {
599 /* DMA mode bits are shifted */
600 new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5;
601 }
602
603 /*
604 * Do not touch buswidth bits here. This is done in
605 * esdhc_pltfm_bus_width.
606 * Do not touch the D3CD bit either which is used for the
607 * SDIO interrupt errata workaround.
608 */
609 mask = 0xffff & ~(ESDHC_CTRL_BUSWIDTH_MASK | ESDHC_CTRL_D3CD);
610
611 esdhc_clrset_le(host, mask, new_val, reg);
612 return;
613 }
614 esdhc_clrset_le(host, 0xff, val, reg);
615
616 /*
617 * The esdhc has a design violation to SDHC spec which tells
618 * that software reset should not affect card detection circuit.
619 * But esdhc clears its SYSCTL register bits [0..2] during the
620 * software reset. This will stop those clocks that card detection
621 * circuit relies on. To work around it, we turn the clocks on back
622 * to keep card detection circuit functional.
623 */
624 if ((reg == SDHCI_SOFTWARE_RESET) && (val & 1)) {
625 esdhc_clrset_le(host, 0x7, 0x7, ESDHC_SYSTEM_CONTROL);
626 /*
627 * The reset on usdhc fails to clear MIX_CTRL register.
628 * Do it manually here.
629 */
630 if (esdhc_is_usdhc(imx_data)) {
631 /* the tuning bits should be kept during reset */
632 new_val = readl(host->ioaddr + ESDHC_MIX_CTRL);
633 writel(new_val & ESDHC_MIX_CTRL_TUNING_MASK,
634 host->ioaddr + ESDHC_MIX_CTRL);
635 imx_data->is_ddr = 0;
636 }
637 }
638}
639
640static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host)
641{
642 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
643
644 return pltfm_host->clock;
645}
646
647static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
648{
649 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
650
651 return pltfm_host->clock / 256 / 16;
652}
653
654static inline void esdhc_pltfm_set_clock(struct sdhci_host *host,
655 unsigned int clock)
656{
657 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
658 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
659 unsigned int host_clock = pltfm_host->clock;
660 int pre_div = 2;
661 int div = 1;
662 u32 temp, val;
663
664 if (clock == 0) {
665 host->mmc->actual_clock = 0;
666
667 if (esdhc_is_usdhc(imx_data)) {
668 val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
669 writel(val & ~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
670 host->ioaddr + ESDHC_VENDOR_SPEC);
671 }
672 return;
673 }
674
675 if (esdhc_is_usdhc(imx_data) && !imx_data->is_ddr)
676 pre_div = 1;
677
678 temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
679 temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
680 | ESDHC_CLOCK_MASK);
681 sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
682
683 while (host_clock / pre_div / 16 > clock && pre_div < 256)
684 pre_div *= 2;
685
686 while (host_clock / pre_div / div > clock && div < 16)
687 div++;
688
689 host->mmc->actual_clock = host_clock / pre_div / div;
690 dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
691 clock, host->mmc->actual_clock);
692
693 if (imx_data->is_ddr)
694 pre_div >>= 2;
695 else
696 pre_div >>= 1;
697 div--;
698
699 temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
700 temp |= (ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
701 | (div << ESDHC_DIVIDER_SHIFT)
702 | (pre_div << ESDHC_PREDIV_SHIFT));
703 sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
704
705 if (esdhc_is_usdhc(imx_data)) {
706 val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
707 writel(val | ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
708 host->ioaddr + ESDHC_VENDOR_SPEC);
709 }
710
711 mdelay(1);
712}
713
714static unsigned int esdhc_pltfm_get_ro(struct sdhci_host *host)
715{
716 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
717 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
718 struct esdhc_platform_data *boarddata = &imx_data->boarddata;
719
720 switch (boarddata->wp_type) {
721 case ESDHC_WP_GPIO:
722 return mmc_gpio_get_ro(host->mmc);
723 case ESDHC_WP_CONTROLLER:
724 return !(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
725 SDHCI_WRITE_PROTECT);
726 case ESDHC_WP_NONE:
727 break;
728 }
729
730 return -ENOSYS;
731}
732
733static void esdhc_pltfm_set_bus_width(struct sdhci_host *host, int width)
734{
735 u32 ctrl;
736
737 switch (width) {
738 case MMC_BUS_WIDTH_8:
739 ctrl = ESDHC_CTRL_8BITBUS;
740 break;
741 case MMC_BUS_WIDTH_4:
742 ctrl = ESDHC_CTRL_4BITBUS;
743 break;
744 default:
745 ctrl = 0;
746 break;
747 }
748
749 esdhc_clrset_le(host, ESDHC_CTRL_BUSWIDTH_MASK, ctrl,
750 SDHCI_HOST_CONTROL);
751}
752
753static void esdhc_prepare_tuning(struct sdhci_host *host, u32 val)
754{
755 u32 reg;
756
757 /* FIXME: delay a bit for card to be ready for next tuning due to errors */
758 mdelay(1);
759
760 reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
761 reg |= ESDHC_MIX_CTRL_EXE_TUNE | ESDHC_MIX_CTRL_SMPCLK_SEL |
762 ESDHC_MIX_CTRL_FBCLK_SEL;
763 writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
764 writel(val << 8, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
765 dev_dbg(mmc_dev(host->mmc),
766 "tunning with delay 0x%x ESDHC_TUNE_CTRL_STATUS 0x%x\n",
767 val, readl(host->ioaddr + ESDHC_TUNE_CTRL_STATUS));
768}
769
770static void esdhc_post_tuning(struct sdhci_host *host)
771{
772 u32 reg;
773
774 reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
775 reg &= ~ESDHC_MIX_CTRL_EXE_TUNE;
776 reg |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
777 writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
778}
779
780static int esdhc_executing_tuning(struct sdhci_host *host, u32 opcode)
781{
782 int min, max, avg, ret;
783
784 /* find the mininum delay first which can pass tuning */
785 min = ESDHC_TUNE_CTRL_MIN;
786 while (min < ESDHC_TUNE_CTRL_MAX) {
787 esdhc_prepare_tuning(host, min);
788 if (!mmc_send_tuning(host->mmc, opcode, NULL))
789 break;
790 min += ESDHC_TUNE_CTRL_STEP;
791 }
792
793 /* find the maxinum delay which can not pass tuning */
794 max = min + ESDHC_TUNE_CTRL_STEP;
795 while (max < ESDHC_TUNE_CTRL_MAX) {
796 esdhc_prepare_tuning(host, max);
797 if (mmc_send_tuning(host->mmc, opcode, NULL)) {
798 max -= ESDHC_TUNE_CTRL_STEP;
799 break;
800 }
801 max += ESDHC_TUNE_CTRL_STEP;
802 }
803
804 /* use average delay to get the best timing */
805 avg = (min + max) / 2;
806 esdhc_prepare_tuning(host, avg);
807 ret = mmc_send_tuning(host->mmc, opcode, NULL);
808 esdhc_post_tuning(host);
809
810 dev_dbg(mmc_dev(host->mmc), "tunning %s at 0x%x ret %d\n",
811 ret ? "failed" : "passed", avg, ret);
812
813 return ret;
814}
815
816static int esdhc_change_pinstate(struct sdhci_host *host,
817 unsigned int uhs)
818{
819 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
820 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
821 struct pinctrl_state *pinctrl;
822
823 dev_dbg(mmc_dev(host->mmc), "change pinctrl state for uhs %d\n", uhs);
824
825 if (IS_ERR(imx_data->pinctrl) ||
826 IS_ERR(imx_data->pins_default) ||
827 IS_ERR(imx_data->pins_100mhz) ||
828 IS_ERR(imx_data->pins_200mhz))
829 return -EINVAL;
830
831 switch (uhs) {
832 case MMC_TIMING_UHS_SDR50:
833 pinctrl = imx_data->pins_100mhz;
834 break;
835 case MMC_TIMING_UHS_SDR104:
836 case MMC_TIMING_MMC_HS200:
837 case MMC_TIMING_MMC_HS400:
838 pinctrl = imx_data->pins_200mhz;
839 break;
840 default:
841 /* back to default state for other legacy timing */
842 pinctrl = imx_data->pins_default;
843 }
844
845 return pinctrl_select_state(imx_data->pinctrl, pinctrl);
846}
847
848/*
849 * For HS400 eMMC, there is a data_strobe line, this signal is generated
850 * by the device and used for data output and CRC status response output
851 * in HS400 mode. The frequency of this signal follows the frequency of
852 * CLK generated by host. Host receive the data which is aligned to the
853 * edge of data_strobe line. Due to the time delay between CLK line and
854 * data_strobe line, if the delay time is larger than one clock cycle,
855 * then CLK and data_strobe line will misaligned, read error shows up.
856 * So when the CLK is higher than 100MHz, each clock cycle is short enough,
857 * host should config the delay target.
858 */
859static void esdhc_set_strobe_dll(struct sdhci_host *host)
860{
861 u32 v;
862
863 if (host->mmc->actual_clock > ESDHC_STROBE_DLL_CLK_FREQ) {
864 /* disable clock before enabling strobe dll */
865 writel(readl(host->ioaddr + ESDHC_VENDOR_SPEC) &
866 ~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
867 host->ioaddr + ESDHC_VENDOR_SPEC);
868
869 /* force a reset on strobe dll */
870 writel(ESDHC_STROBE_DLL_CTRL_RESET,
871 host->ioaddr + ESDHC_STROBE_DLL_CTRL);
872 /*
873 * enable strobe dll ctrl and adjust the delay target
874 * for the uSDHC loopback read clock
875 */
876 v = ESDHC_STROBE_DLL_CTRL_ENABLE |
877 (7 << ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT);
878 writel(v, host->ioaddr + ESDHC_STROBE_DLL_CTRL);
879 /* wait 1us to make sure strobe dll status register stable */
880 udelay(1);
881 v = readl(host->ioaddr + ESDHC_STROBE_DLL_STATUS);
882 if (!(v & ESDHC_STROBE_DLL_STS_REF_LOCK))
883 dev_warn(mmc_dev(host->mmc),
884 "warning! HS400 strobe DLL status REF not lock!\n");
885 if (!(v & ESDHC_STROBE_DLL_STS_SLV_LOCK))
886 dev_warn(mmc_dev(host->mmc),
887 "warning! HS400 strobe DLL status SLV not lock!\n");
888 }
889}
890
891static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
892{
893 u32 m;
894 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
895 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
896 struct esdhc_platform_data *boarddata = &imx_data->boarddata;
897
898 /* disable ddr mode and disable HS400 mode */
899 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
900 m &= ~(ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN);
901 imx_data->is_ddr = 0;
902
903 switch (timing) {
904 case MMC_TIMING_UHS_SDR12:
905 case MMC_TIMING_UHS_SDR25:
906 case MMC_TIMING_UHS_SDR50:
907 case MMC_TIMING_UHS_SDR104:
908 case MMC_TIMING_MMC_HS200:
909 writel(m, host->ioaddr + ESDHC_MIX_CTRL);
910 break;
911 case MMC_TIMING_UHS_DDR50:
912 case MMC_TIMING_MMC_DDR52:
913 m |= ESDHC_MIX_CTRL_DDREN;
914 writel(m, host->ioaddr + ESDHC_MIX_CTRL);
915 imx_data->is_ddr = 1;
916 if (boarddata->delay_line) {
917 u32 v;
918 v = boarddata->delay_line <<
919 ESDHC_DLL_OVERRIDE_VAL_SHIFT |
920 (1 << ESDHC_DLL_OVERRIDE_EN_SHIFT);
921 if (is_imx53_esdhc(imx_data))
922 v <<= 1;
923 writel(v, host->ioaddr + ESDHC_DLL_CTRL);
924 }
925 break;
926 case MMC_TIMING_MMC_HS400:
927 m |= ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN;
928 writel(m, host->ioaddr + ESDHC_MIX_CTRL);
929 imx_data->is_ddr = 1;
930 /* update clock after enable DDR for strobe DLL lock */
931 host->ops->set_clock(host, host->clock);
932 esdhc_set_strobe_dll(host);
933 break;
934 }
935
936 esdhc_change_pinstate(host, timing);
937}
938
939static void esdhc_reset(struct sdhci_host *host, u8 mask)
940{
941 sdhci_reset(host, mask);
942
943 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
944 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
945}
946
947static unsigned int esdhc_get_max_timeout_count(struct sdhci_host *host)
948{
949 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
950 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
951
952 /* Doc Errata: the uSDHC actual maximum timeout count is 1 << 29 */
953 return esdhc_is_usdhc(imx_data) ? 1 << 29 : 1 << 27;
954}
955
956static void esdhc_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
957{
958 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
959 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
960
961 /* use maximum timeout counter */
962 esdhc_clrset_le(host, ESDHC_SYS_CTRL_DTOCV_MASK,
963 esdhc_is_usdhc(imx_data) ? 0xF : 0xE,
964 SDHCI_TIMEOUT_CONTROL);
965}
966
967static struct sdhci_ops sdhci_esdhc_ops = {
968 .read_l = esdhc_readl_le,
969 .read_w = esdhc_readw_le,
970 .read_b = esdhc_readb_le,
971 .write_l = esdhc_writel_le,
972 .write_w = esdhc_writew_le,
973 .write_b = esdhc_writeb_le,
974 .set_clock = esdhc_pltfm_set_clock,
975 .get_max_clock = esdhc_pltfm_get_max_clock,
976 .get_min_clock = esdhc_pltfm_get_min_clock,
977 .get_max_timeout_count = esdhc_get_max_timeout_count,
978 .get_ro = esdhc_pltfm_get_ro,
979 .set_timeout = esdhc_set_timeout,
980 .set_bus_width = esdhc_pltfm_set_bus_width,
981 .set_uhs_signaling = esdhc_set_uhs_signaling,
982 .reset = esdhc_reset,
983};
984
985static const struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
986 .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_NO_HISPD_BIT
987 | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
988 | SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC
989 | SDHCI_QUIRK_BROKEN_CARD_DETECTION,
990 .ops = &sdhci_esdhc_ops,
991};
992
993static void sdhci_esdhc_imx_hwinit(struct sdhci_host *host)
994{
995 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
996 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
997 int tmp;
998
999 if (esdhc_is_usdhc(imx_data)) {
1000 /*
1001 * The imx6q ROM code will change the default watermark
1002 * level setting to something insane. Change it back here.
1003 */
1004 writel(ESDHC_WTMK_DEFAULT_VAL, host->ioaddr + ESDHC_WTMK_LVL);
1005
1006 /*
1007 * ROM code will change the bit burst_length_enable setting
1008 * to zero if this usdhc is choosed to boot system. Change
1009 * it back here, otherwise it will impact the performance a
1010 * lot. This bit is used to enable/disable the burst length
1011 * for the external AHB2AXI bridge, it's usefully especially
1012 * for INCR transfer because without burst length indicator,
1013 * the AHB2AXI bridge does not know the burst length in
1014 * advance. And without burst length indicator, AHB INCR
1015 * transfer can only be converted to singles on the AXI side.
1016 */
1017 writel(readl(host->ioaddr + SDHCI_HOST_CONTROL)
1018 | ESDHC_BURST_LEN_EN_INCR,
1019 host->ioaddr + SDHCI_HOST_CONTROL);
1020 /*
1021 * errata ESDHC_FLAG_ERR004536 fix for MX6Q TO1.2 and MX6DL
1022 * TO1.1, it's harmless for MX6SL
1023 */
1024 writel(readl(host->ioaddr + 0x6c) | BIT(7),
1025 host->ioaddr + 0x6c);
1026
1027 /* disable DLL_CTRL delay line settings */
1028 writel(0x0, host->ioaddr + ESDHC_DLL_CTRL);
1029
1030 if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
1031 tmp = readl(host->ioaddr + ESDHC_TUNING_CTRL);
1032 tmp |= ESDHC_STD_TUNING_EN |
1033 ESDHC_TUNING_START_TAP_DEFAULT;
1034 if (imx_data->boarddata.tuning_start_tap) {
1035 tmp &= ~ESDHC_TUNING_START_TAP_MASK;
1036 tmp |= imx_data->boarddata.tuning_start_tap;
1037 }
1038
1039 if (imx_data->boarddata.tuning_step) {
1040 tmp &= ~ESDHC_TUNING_STEP_MASK;
1041 tmp |= imx_data->boarddata.tuning_step
1042 << ESDHC_TUNING_STEP_SHIFT;
1043 }
1044 writel(tmp, host->ioaddr + ESDHC_TUNING_CTRL);
1045 }
1046 }
1047}
1048
1049#ifdef CONFIG_OF
1050static int
1051sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
1052 struct sdhci_host *host,
1053 struct pltfm_imx_data *imx_data)
1054{
1055 struct device_node *np = pdev->dev.of_node;
1056 struct esdhc_platform_data *boarddata = &imx_data->boarddata;
1057 int ret;
1058
1059 if (of_get_property(np, "fsl,wp-controller", NULL))
1060 boarddata->wp_type = ESDHC_WP_CONTROLLER;
1061
1062 boarddata->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
1063 if (gpio_is_valid(boarddata->wp_gpio))
1064 boarddata->wp_type = ESDHC_WP_GPIO;
1065
1066 of_property_read_u32(np, "fsl,tuning-step", &boarddata->tuning_step);
1067 of_property_read_u32(np, "fsl,tuning-start-tap",
1068 &boarddata->tuning_start_tap);
1069
1070 if (of_find_property(np, "no-1-8-v", NULL))
1071 boarddata->support_vsel = false;
1072 else
1073 boarddata->support_vsel = true;
1074
1075 if (of_property_read_u32(np, "fsl,delay-line", &boarddata->delay_line))
1076 boarddata->delay_line = 0;
1077
1078 mmc_of_parse_voltage(np, &host->ocr_mask);
1079
1080 /* sdr50 and sdr104 needs work on 1.8v signal voltage */
1081 if ((boarddata->support_vsel) && esdhc_is_usdhc(imx_data) &&
1082 !IS_ERR(imx_data->pins_default)) {
1083 imx_data->pins_100mhz = pinctrl_lookup_state(imx_data->pinctrl,
1084 ESDHC_PINCTRL_STATE_100MHZ);
1085 imx_data->pins_200mhz = pinctrl_lookup_state(imx_data->pinctrl,
1086 ESDHC_PINCTRL_STATE_200MHZ);
1087 if (IS_ERR(imx_data->pins_100mhz) ||
1088 IS_ERR(imx_data->pins_200mhz)) {
1089 dev_warn(mmc_dev(host->mmc),
1090 "could not get ultra high speed state, work on normal mode\n");
1091 /*
1092 * fall back to not support uhs by specify no 1.8v quirk
1093 */
1094 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
1095 }
1096 } else {
1097 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
1098 }
1099
1100 /* call to generic mmc_of_parse to support additional capabilities */
1101 ret = mmc_of_parse(host->mmc);
1102 if (ret)
1103 return ret;
1104
1105 if (mmc_gpio_get_cd(host->mmc) >= 0)
1106 host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
1107
1108 return 0;
1109}
1110#else
1111static inline int
1112sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
1113 struct sdhci_host *host,
1114 struct pltfm_imx_data *imx_data)
1115{
1116 return -ENODEV;
1117}
1118#endif
1119
1120static int sdhci_esdhc_imx_probe_nondt(struct platform_device *pdev,
1121 struct sdhci_host *host,
1122 struct pltfm_imx_data *imx_data)
1123{
1124 struct esdhc_platform_data *boarddata = &imx_data->boarddata;
1125 int err;
1126
1127 if (!host->mmc->parent->platform_data) {
1128 dev_err(mmc_dev(host->mmc), "no board data!\n");
1129 return -EINVAL;
1130 }
1131
1132 imx_data->boarddata = *((struct esdhc_platform_data *)
1133 host->mmc->parent->platform_data);
1134 /* write_protect */
1135 if (boarddata->wp_type == ESDHC_WP_GPIO) {
1136 err = mmc_gpio_request_ro(host->mmc, boarddata->wp_gpio);
1137 if (err) {
1138 dev_err(mmc_dev(host->mmc),
1139 "failed to request write-protect gpio!\n");
1140 return err;
1141 }
1142 host->mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
1143 }
1144
1145 /* card_detect */
1146 switch (boarddata->cd_type) {
1147 case ESDHC_CD_GPIO:
1148 err = mmc_gpio_request_cd(host->mmc, boarddata->cd_gpio, 0);
1149 if (err) {
1150 dev_err(mmc_dev(host->mmc),
1151 "failed to request card-detect gpio!\n");
1152 return err;
1153 }
1154 /* fall through */
1155
1156 case ESDHC_CD_CONTROLLER:
1157 /* we have a working card_detect back */
1158 host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
1159 break;
1160
1161 case ESDHC_CD_PERMANENT:
1162 host->mmc->caps |= MMC_CAP_NONREMOVABLE;
1163 break;
1164
1165 case ESDHC_CD_NONE:
1166 break;
1167 }
1168
1169 switch (boarddata->max_bus_width) {
1170 case 8:
1171 host->mmc->caps |= MMC_CAP_8_BIT_DATA | MMC_CAP_4_BIT_DATA;
1172 break;
1173 case 4:
1174 host->mmc->caps |= MMC_CAP_4_BIT_DATA;
1175 break;
1176 case 1:
1177 default:
1178 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
1179 break;
1180 }
1181
1182 return 0;
1183}
1184
1185static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
1186{
1187 const struct of_device_id *of_id =
1188 of_match_device(imx_esdhc_dt_ids, &pdev->dev);
1189 struct sdhci_pltfm_host *pltfm_host;
1190 struct sdhci_host *host;
1191 int err;
1192 struct pltfm_imx_data *imx_data;
1193
1194 host = sdhci_pltfm_init(pdev, &sdhci_esdhc_imx_pdata,
1195 sizeof(*imx_data));
1196 if (IS_ERR(host))
1197 return PTR_ERR(host);
1198
1199 pltfm_host = sdhci_priv(host);
1200
1201 imx_data = sdhci_pltfm_priv(pltfm_host);
1202
1203 imx_data->socdata = of_id ? of_id->data : (struct esdhc_soc_data *)
1204 pdev->id_entry->driver_data;
1205
1206 imx_data->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1207 if (IS_ERR(imx_data->clk_ipg)) {
1208 err = PTR_ERR(imx_data->clk_ipg);
1209 goto free_sdhci;
1210 }
1211
1212 imx_data->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
1213 if (IS_ERR(imx_data->clk_ahb)) {
1214 err = PTR_ERR(imx_data->clk_ahb);
1215 goto free_sdhci;
1216 }
1217
1218 imx_data->clk_per = devm_clk_get(&pdev->dev, "per");
1219 if (IS_ERR(imx_data->clk_per)) {
1220 err = PTR_ERR(imx_data->clk_per);
1221 goto free_sdhci;
1222 }
1223
1224 pltfm_host->clk = imx_data->clk_per;
1225 pltfm_host->clock = clk_get_rate(pltfm_host->clk);
1226 clk_prepare_enable(imx_data->clk_per);
1227 clk_prepare_enable(imx_data->clk_ipg);
1228 clk_prepare_enable(imx_data->clk_ahb);
1229
1230 imx_data->pinctrl = devm_pinctrl_get(&pdev->dev);
1231 if (IS_ERR(imx_data->pinctrl)) {
1232 err = PTR_ERR(imx_data->pinctrl);
1233 goto disable_clk;
1234 }
1235
1236 imx_data->pins_default = pinctrl_lookup_state(imx_data->pinctrl,
1237 PINCTRL_STATE_DEFAULT);
1238 if (IS_ERR(imx_data->pins_default))
1239 dev_warn(mmc_dev(host->mmc), "could not get default state\n");
1240
1241 if (imx_data->socdata->flags & ESDHC_FLAG_ENGCM07207)
1242 /* Fix errata ENGcm07207 present on i.MX25 and i.MX35 */
1243 host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK
1244 | SDHCI_QUIRK_BROKEN_ADMA;
1245
1246 if (esdhc_is_usdhc(imx_data)) {
1247 host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
1248 host->mmc->caps |= MMC_CAP_1_8V_DDR;
1249 if (!(imx_data->socdata->flags & ESDHC_FLAG_HS200))
1250 host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
1251
1252 /* clear tuning bits in case ROM has set it already */
1253 writel(0x0, host->ioaddr + ESDHC_MIX_CTRL);
1254 writel(0x0, host->ioaddr + SDHCI_ACMD12_ERR);
1255 writel(0x0, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
1256 }
1257
1258 if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
1259 sdhci_esdhc_ops.platform_execute_tuning =
1260 esdhc_executing_tuning;
1261
1262 if (imx_data->socdata->flags & ESDHC_FLAG_ERR004536)
1263 host->quirks |= SDHCI_QUIRK_BROKEN_ADMA;
1264
1265 if (imx_data->socdata->flags & ESDHC_FLAG_HS400)
1266 host->quirks2 |= SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400;
1267
1268 if (of_id)
1269 err = sdhci_esdhc_imx_probe_dt(pdev, host, imx_data);
1270 else
1271 err = sdhci_esdhc_imx_probe_nondt(pdev, host, imx_data);
1272 if (err)
1273 goto disable_clk;
1274
1275 sdhci_esdhc_imx_hwinit(host);
1276
1277 err = sdhci_add_host(host);
1278 if (err)
1279 goto disable_clk;
1280
1281 pm_runtime_set_active(&pdev->dev);
1282 pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
1283 pm_runtime_use_autosuspend(&pdev->dev);
1284 pm_suspend_ignore_children(&pdev->dev, 1);
1285 pm_runtime_enable(&pdev->dev);
1286
1287 return 0;
1288
1289disable_clk:
1290 clk_disable_unprepare(imx_data->clk_per);
1291 clk_disable_unprepare(imx_data->clk_ipg);
1292 clk_disable_unprepare(imx_data->clk_ahb);
1293free_sdhci:
1294 sdhci_pltfm_free(pdev);
1295 return err;
1296}
1297
1298static int sdhci_esdhc_imx_remove(struct platform_device *pdev)
1299{
1300 struct sdhci_host *host = platform_get_drvdata(pdev);
1301 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1302 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1303 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
1304
1305 pm_runtime_get_sync(&pdev->dev);
1306 pm_runtime_disable(&pdev->dev);
1307 pm_runtime_put_noidle(&pdev->dev);
1308
1309 sdhci_remove_host(host, dead);
1310
1311 clk_disable_unprepare(imx_data->clk_per);
1312 clk_disable_unprepare(imx_data->clk_ipg);
1313 clk_disable_unprepare(imx_data->clk_ahb);
1314
1315 sdhci_pltfm_free(pdev);
1316
1317 return 0;
1318}
1319
1320#ifdef CONFIG_PM_SLEEP
1321static int sdhci_esdhc_suspend(struct device *dev)
1322{
1323 struct sdhci_host *host = dev_get_drvdata(dev);
1324
1325 return sdhci_suspend_host(host);
1326}
1327
1328static int sdhci_esdhc_resume(struct device *dev)
1329{
1330 struct sdhci_host *host = dev_get_drvdata(dev);
1331
1332 /* re-initialize hw state in case it's lost in low power mode */
1333 sdhci_esdhc_imx_hwinit(host);
1334
1335 return sdhci_resume_host(host);
1336}
1337#endif
1338
1339#ifdef CONFIG_PM
1340static int sdhci_esdhc_runtime_suspend(struct device *dev)
1341{
1342 struct sdhci_host *host = dev_get_drvdata(dev);
1343 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1344 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1345 int ret;
1346
1347 ret = sdhci_runtime_suspend_host(host);
1348
1349 if (!sdhci_sdio_irq_enabled(host)) {
1350 clk_disable_unprepare(imx_data->clk_per);
1351 clk_disable_unprepare(imx_data->clk_ipg);
1352 }
1353 clk_disable_unprepare(imx_data->clk_ahb);
1354
1355 return ret;
1356}
1357
1358static int sdhci_esdhc_runtime_resume(struct device *dev)
1359{
1360 struct sdhci_host *host = dev_get_drvdata(dev);
1361 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1362 struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1363
1364 if (!sdhci_sdio_irq_enabled(host)) {
1365 clk_prepare_enable(imx_data->clk_per);
1366 clk_prepare_enable(imx_data->clk_ipg);
1367 }
1368 clk_prepare_enable(imx_data->clk_ahb);
1369
1370 return sdhci_runtime_resume_host(host);
1371}
1372#endif
1373
1374static const struct dev_pm_ops sdhci_esdhc_pmops = {
1375 SET_SYSTEM_SLEEP_PM_OPS(sdhci_esdhc_suspend, sdhci_esdhc_resume)
1376 SET_RUNTIME_PM_OPS(sdhci_esdhc_runtime_suspend,
1377 sdhci_esdhc_runtime_resume, NULL)
1378};
1379
1380static struct platform_driver sdhci_esdhc_imx_driver = {
1381 .driver = {
1382 .name = "sdhci-esdhc-imx",
1383 .of_match_table = imx_esdhc_dt_ids,
1384 .pm = &sdhci_esdhc_pmops,
1385 },
1386 .id_table = imx_esdhc_devtype,
1387 .probe = sdhci_esdhc_imx_probe,
1388 .remove = sdhci_esdhc_imx_remove,
1389};
1390
1391module_platform_driver(sdhci_esdhc_imx_driver);
1392
1393MODULE_DESCRIPTION("SDHCI driver for Freescale i.MX eSDHC");
1394MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
1395MODULE_LICENSE("GPL v2");