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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Renesas SDHI
4 *
5 * Copyright (C) 2015-19 Renesas Electronics Corporation
6 * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang
7 * Copyright (C) 2016-17 Horms Solutions, Simon Horman
8 * Copyright (C) 2009 Magnus Damm
9 *
10 * Based on "Compaq ASIC3 support":
11 *
12 * Copyright 2001 Compaq Computer Corporation.
13 * Copyright 2004-2005 Phil Blundell
14 * Copyright 2007-2008 OpenedHand Ltd.
15 *
16 * Authors: Phil Blundell <pb@handhelds.org>,
17 * Samuel Ortiz <sameo@openedhand.com>
18 *
19 */
20
21#include <linux/kernel.h>
22#include <linux/clk.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/of_device.h>
26#include <linux/platform_device.h>
27#include <linux/mmc/host.h>
28#include <linux/mmc/slot-gpio.h>
29#include <linux/mfd/tmio.h>
30#include <linux/sh_dma.h>
31#include <linux/delay.h>
32#include <linux/pinctrl/consumer.h>
33#include <linux/pinctrl/pinctrl-state.h>
34#include <linux/regulator/consumer.h>
35#include <linux/sys_soc.h>
36
37#include "renesas_sdhi.h"
38#include "tmio_mmc.h"
39
40#define HOST_MODE 0xe4
41
42#define SDHI_VER_GEN2_SDR50 0x490c
43#define SDHI_VER_RZ_A1 0x820b
44/* very old datasheets said 0x490c for SDR104, too. They are wrong! */
45#define SDHI_VER_GEN2_SDR104 0xcb0d
46#define SDHI_VER_GEN3_SD 0xcc10
47#define SDHI_VER_GEN3_SDMMC 0xcd10
48
49struct renesas_sdhi_quirks {
50 bool hs400_disabled;
51 bool hs400_4taps;
52};
53
54static void renesas_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width)
55{
56 u32 val;
57
58 /*
59 * see also
60 * renesas_sdhi_of_data :: dma_buswidth
61 */
62 switch (sd_ctrl_read16(host, CTL_VERSION)) {
63 case SDHI_VER_GEN2_SDR50:
64 val = (width == 32) ? 0x0001 : 0x0000;
65 break;
66 case SDHI_VER_GEN2_SDR104:
67 val = (width == 32) ? 0x0000 : 0x0001;
68 break;
69 case SDHI_VER_GEN3_SD:
70 case SDHI_VER_GEN3_SDMMC:
71 if (width == 64)
72 val = 0x0000;
73 else if (width == 32)
74 val = 0x0101;
75 else
76 val = 0x0001;
77 break;
78 default:
79 /* nothing to do */
80 return;
81 }
82
83 sd_ctrl_write16(host, HOST_MODE, val);
84}
85
86static int renesas_sdhi_clk_enable(struct tmio_mmc_host *host)
87{
88 struct mmc_host *mmc = host->mmc;
89 struct renesas_sdhi *priv = host_to_priv(host);
90 int ret = clk_prepare_enable(priv->clk);
91
92 if (ret < 0)
93 return ret;
94
95 ret = clk_prepare_enable(priv->clk_cd);
96 if (ret < 0) {
97 clk_disable_unprepare(priv->clk);
98 return ret;
99 }
100
101 /*
102 * The clock driver may not know what maximum frequency
103 * actually works, so it should be set with the max-frequency
104 * property which will already have been read to f_max. If it
105 * was missing, assume the current frequency is the maximum.
106 */
107 if (!mmc->f_max)
108 mmc->f_max = clk_get_rate(priv->clk);
109
110 /*
111 * Minimum frequency is the minimum input clock frequency
112 * divided by our maximum divider.
113 */
114 mmc->f_min = max(clk_round_rate(priv->clk, 1) / 512, 1L);
115
116 /* enable 16bit data access on SDBUF as default */
117 renesas_sdhi_sdbuf_width(host, 16);
118
119 return 0;
120}
121
122static unsigned int renesas_sdhi_clk_update(struct tmio_mmc_host *host,
123 unsigned int new_clock)
124{
125 struct renesas_sdhi *priv = host_to_priv(host);
126 unsigned int freq, diff, best_freq = 0, diff_min = ~0;
127 int i;
128
129 /* tested only on R-Car Gen2+ currently; may work for others */
130 if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
131 return clk_get_rate(priv->clk);
132
133 /*
134 * We want the bus clock to be as close as possible to, but no
135 * greater than, new_clock. As we can divide by 1 << i for
136 * any i in [0, 9] we want the input clock to be as close as
137 * possible, but no greater than, new_clock << i.
138 */
139 for (i = min(9, ilog2(UINT_MAX / new_clock)); i >= 0; i--) {
140 freq = clk_round_rate(priv->clk, new_clock << i);
141 if (freq > (new_clock << i)) {
142 /* Too fast; look for a slightly slower option */
143 freq = clk_round_rate(priv->clk,
144 (new_clock << i) / 4 * 3);
145 if (freq > (new_clock << i))
146 continue;
147 }
148
149 diff = new_clock - (freq >> i);
150 if (diff <= diff_min) {
151 best_freq = freq;
152 diff_min = diff;
153 }
154 }
155
156 clk_set_rate(priv->clk, best_freq);
157
158 return clk_get_rate(priv->clk);
159}
160
161static void renesas_sdhi_set_clock(struct tmio_mmc_host *host,
162 unsigned int new_clock)
163{
164 u32 clk = 0, clock;
165
166 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
167 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
168
169 if (new_clock == 0) {
170 host->mmc->actual_clock = 0;
171 goto out;
172 }
173
174 host->mmc->actual_clock = renesas_sdhi_clk_update(host, new_clock);
175 clock = host->mmc->actual_clock / 512;
176
177 for (clk = 0x80000080; new_clock >= (clock << 1); clk >>= 1)
178 clock <<= 1;
179
180 /* 1/1 clock is option */
181 if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) && ((clk >> 22) & 0x1)) {
182 if (!(host->mmc->ios.timing == MMC_TIMING_MMC_HS400))
183 clk |= 0xff;
184 else
185 clk &= ~0xff;
186 }
187
188 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
189 if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
190 usleep_range(10000, 11000);
191
192 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
193 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
194
195out:
196 /* HW engineers overrode docs: no sleep needed on R-Car2+ */
197 if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
198 usleep_range(10000, 11000);
199}
200
201static void renesas_sdhi_clk_disable(struct tmio_mmc_host *host)
202{
203 struct renesas_sdhi *priv = host_to_priv(host);
204
205 clk_disable_unprepare(priv->clk);
206 clk_disable_unprepare(priv->clk_cd);
207}
208
209static int renesas_sdhi_card_busy(struct mmc_host *mmc)
210{
211 struct tmio_mmc_host *host = mmc_priv(mmc);
212
213 return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) &
214 TMIO_STAT_DAT0);
215}
216
217static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
218 struct mmc_ios *ios)
219{
220 struct tmio_mmc_host *host = mmc_priv(mmc);
221 struct renesas_sdhi *priv = host_to_priv(host);
222 struct pinctrl_state *pin_state;
223 int ret;
224
225 switch (ios->signal_voltage) {
226 case MMC_SIGNAL_VOLTAGE_330:
227 pin_state = priv->pins_default;
228 break;
229 case MMC_SIGNAL_VOLTAGE_180:
230 pin_state = priv->pins_uhs;
231 break;
232 default:
233 return -EINVAL;
234 }
235
236 /*
237 * If anything is missing, assume signal voltage is fixed at
238 * 3.3V and succeed/fail accordingly.
239 */
240 if (IS_ERR(priv->pinctrl) || IS_ERR(pin_state))
241 return ios->signal_voltage ==
242 MMC_SIGNAL_VOLTAGE_330 ? 0 : -EINVAL;
243
244 ret = mmc_regulator_set_vqmmc(host->mmc, ios);
245 if (ret)
246 return ret;
247
248 return pinctrl_select_state(priv->pinctrl, pin_state);
249}
250
251/* SCC registers */
252#define SH_MOBILE_SDHI_SCC_DTCNTL 0x000
253#define SH_MOBILE_SDHI_SCC_TAPSET 0x002
254#define SH_MOBILE_SDHI_SCC_DT2FF 0x004
255#define SH_MOBILE_SDHI_SCC_CKSEL 0x006
256#define SH_MOBILE_SDHI_SCC_RVSCNTL 0x008
257#define SH_MOBILE_SDHI_SCC_RVSREQ 0x00A
258#define SH_MOBILE_SDHI_SCC_TMPPORT2 0x00E
259
260/* Definitions for values the SH_MOBILE_SDHI_SCC_DTCNTL register */
261#define SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN BIT(0)
262#define SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT 16
263#define SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_MASK 0xff
264
265/* Definitions for values the SH_MOBILE_SDHI_SCC_CKSEL register */
266#define SH_MOBILE_SDHI_SCC_CKSEL_DTSEL BIT(0)
267/* Definitions for values the SH_MOBILE_SDHI_SCC_RVSCNTL register */
268#define SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN BIT(0)
269/* Definitions for values the SH_MOBILE_SDHI_SCC_RVSREQ register */
270#define SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR BIT(2)
271/* Definitions for values the SH_MOBILE_SDHI_SCC_TMPPORT2 register */
272#define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL BIT(4)
273#define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN BIT(31)
274
275static inline u32 sd_scc_read32(struct tmio_mmc_host *host,
276 struct renesas_sdhi *priv, int addr)
277{
278 return readl(priv->scc_ctl + (addr << host->bus_shift));
279}
280
281static inline void sd_scc_write32(struct tmio_mmc_host *host,
282 struct renesas_sdhi *priv,
283 int addr, u32 val)
284{
285 writel(val, priv->scc_ctl + (addr << host->bus_shift));
286}
287
288static unsigned int renesas_sdhi_init_tuning(struct tmio_mmc_host *host)
289{
290 struct renesas_sdhi *priv;
291
292 priv = host_to_priv(host);
293
294 /* Initialize SCC */
295 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, 0x0);
296
297 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
298 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
299
300 /* set sampling clock selection range */
301 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
302 SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN |
303 0x8 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT);
304
305 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
306 SH_MOBILE_SDHI_SCC_CKSEL_DTSEL |
307 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL));
308
309 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
310 ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
311 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
312
313 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos);
314
315 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
316 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
317
318 /* Read TAPNUM */
319 return (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL) >>
320 SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT) &
321 SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_MASK;
322}
323
324static void renesas_sdhi_prepare_tuning(struct tmio_mmc_host *host,
325 unsigned long tap)
326{
327 struct renesas_sdhi *priv = host_to_priv(host);
328
329 /* Set sampling clock position */
330 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, tap);
331}
332
333static void renesas_sdhi_hs400_complete(struct tmio_mmc_host *host)
334{
335 struct renesas_sdhi *priv = host_to_priv(host);
336
337 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
338 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
339
340 /* Set HS400 mode */
341 sd_ctrl_write16(host, CTL_SDIF_MODE, 0x0001 |
342 sd_ctrl_read16(host, CTL_SDIF_MODE));
343
344 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF,
345 priv->scc_tappos_hs400);
346
347 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
348 (SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
349 SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) |
350 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2));
351
352 /* Set the sampling clock selection range of HS400 mode */
353 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
354 SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN |
355 0x4 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT);
356
357
358 if (host->pdata->flags & TMIO_MMC_HAVE_4TAP_HS400)
359 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET,
360 host->tap_set / 2);
361
362 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
363 SH_MOBILE_SDHI_SCC_CKSEL_DTSEL |
364 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL));
365
366 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
367 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
368}
369
370static void renesas_sdhi_reset_scc(struct tmio_mmc_host *host,
371 struct renesas_sdhi *priv)
372{
373 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
374 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
375
376 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
377 ~SH_MOBILE_SDHI_SCC_CKSEL_DTSEL &
378 sd_scc_read32(host, priv,
379 SH_MOBILE_SDHI_SCC_CKSEL));
380}
381
382static void renesas_sdhi_disable_scc(struct tmio_mmc_host *host)
383{
384 struct renesas_sdhi *priv = host_to_priv(host);
385
386 renesas_sdhi_reset_scc(host, priv);
387
388 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
389 ~SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN &
390 sd_scc_read32(host, priv,
391 SH_MOBILE_SDHI_SCC_DTCNTL));
392
393 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
394 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
395}
396
397static void renesas_sdhi_reset_hs400_mode(struct tmio_mmc_host *host,
398 struct renesas_sdhi *priv)
399{
400 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
401 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
402
403 /* Reset HS400 mode */
404 sd_ctrl_write16(host, CTL_SDIF_MODE, ~0x0001 &
405 sd_ctrl_read16(host, CTL_SDIF_MODE));
406
407 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos);
408
409 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
410 ~(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
411 SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) &
412 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2));
413
414 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
415 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
416}
417
418static void renesas_sdhi_prepare_hs400_tuning(struct tmio_mmc_host *host)
419{
420 renesas_sdhi_reset_hs400_mode(host, host_to_priv(host));
421}
422
423#define SH_MOBILE_SDHI_MAX_TAP 3
424
425static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
426{
427 struct renesas_sdhi *priv = host_to_priv(host);
428 unsigned long tap_cnt; /* counter of tuning success */
429 unsigned long tap_start;/* start position of tuning success */
430 unsigned long tap_end; /* end position of tuning success */
431 unsigned long ntap; /* temporary counter of tuning success */
432 unsigned long i;
433
434 /* Clear SCC_RVSREQ */
435 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
436
437 /*
438 * When tuning CMD19 is issued twice for each tap, merge the
439 * result requiring the tap to be good in both runs before
440 * considering it for tuning selection.
441 */
442 for (i = 0; i < host->tap_num * 2; i++) {
443 int offset = host->tap_num * (i < host->tap_num ? 1 : -1);
444
445 if (!test_bit(i, host->taps))
446 clear_bit(i + offset, host->taps);
447 }
448
449 /*
450 * Find the longest consecutive run of successful probes. If that
451 * is more than SH_MOBILE_SDHI_MAX_TAP probes long then use the
452 * center index as the tap.
453 */
454 tap_cnt = 0;
455 ntap = 0;
456 tap_start = 0;
457 tap_end = 0;
458 for (i = 0; i < host->tap_num * 2; i++) {
459 if (test_bit(i, host->taps)) {
460 ntap++;
461 } else {
462 if (ntap > tap_cnt) {
463 tap_start = i - ntap;
464 tap_end = i - 1;
465 tap_cnt = ntap;
466 }
467 ntap = 0;
468 }
469 }
470
471 if (ntap > tap_cnt) {
472 tap_start = i - ntap;
473 tap_end = i - 1;
474 tap_cnt = ntap;
475 }
476
477 if (tap_cnt >= SH_MOBILE_SDHI_MAX_TAP)
478 host->tap_set = (tap_start + tap_end) / 2 % host->tap_num;
479 else
480 return -EIO;
481
482 /* Set SCC */
483 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, host->tap_set);
484
485 /* Enable auto re-tuning */
486 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
487 SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN |
488 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
489
490 return 0;
491}
492
493static bool renesas_sdhi_check_scc_error(struct tmio_mmc_host *host)
494{
495 struct renesas_sdhi *priv = host_to_priv(host);
496 bool use_4tap = host->pdata->flags & TMIO_MMC_HAVE_4TAP_HS400;
497
498 /*
499 * Skip checking SCC errors when running on 4 taps in HS400 mode as
500 * any retuning would still result in the same 4 taps being used.
501 */
502 if (!(host->mmc->ios.timing == MMC_TIMING_UHS_SDR104) &&
503 !(host->mmc->ios.timing == MMC_TIMING_MMC_HS200) &&
504 !(host->mmc->ios.timing == MMC_TIMING_MMC_HS400 && !use_4tap))
505 return false;
506
507 if (mmc_doing_retune(host->mmc))
508 return false;
509
510 /* Check SCC error */
511 if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL) &
512 SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &&
513 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ) &
514 SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR) {
515 /* Clear SCC error */
516 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
517 return true;
518 }
519
520 return false;
521}
522
523static void renesas_sdhi_hw_reset(struct tmio_mmc_host *host)
524{
525 struct renesas_sdhi *priv;
526
527 priv = host_to_priv(host);
528
529 renesas_sdhi_reset_scc(host, priv);
530 renesas_sdhi_reset_hs400_mode(host, priv);
531
532 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
533 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
534
535 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
536 ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
537 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
538
539 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
540 ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
541 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
542
543 if (host->pdata->flags & TMIO_MMC_MIN_RCAR2)
544 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK,
545 TMIO_MASK_INIT_RCAR2);
546}
547
548static int renesas_sdhi_wait_idle(struct tmio_mmc_host *host, u32 bit)
549{
550 int timeout = 1000;
551 /* CBSY is set when busy, SCLKDIVEN is cleared when busy */
552 u32 wait_state = (bit == TMIO_STAT_CMD_BUSY ? TMIO_STAT_CMD_BUSY : 0);
553
554 while (--timeout && (sd_ctrl_read16_and_16_as_32(host, CTL_STATUS)
555 & bit) == wait_state)
556 udelay(1);
557
558 if (!timeout) {
559 dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n");
560 return -EBUSY;
561 }
562
563 return 0;
564}
565
566static int renesas_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
567{
568 u32 bit = TMIO_STAT_SCLKDIVEN;
569
570 switch (addr) {
571 case CTL_SD_CMD:
572 case CTL_STOP_INTERNAL_ACTION:
573 case CTL_XFER_BLK_COUNT:
574 case CTL_SD_XFER_LEN:
575 case CTL_SD_MEM_CARD_OPT:
576 case CTL_TRANSACTION_CTL:
577 case CTL_DMA_ENABLE:
578 case HOST_MODE:
579 if (host->pdata->flags & TMIO_MMC_HAVE_CBSY)
580 bit = TMIO_STAT_CMD_BUSY;
581 /* fallthrough */
582 case CTL_SD_CARD_CLK_CTL:
583 return renesas_sdhi_wait_idle(host, bit);
584 }
585
586 return 0;
587}
588
589static int renesas_sdhi_multi_io_quirk(struct mmc_card *card,
590 unsigned int direction, int blk_size)
591{
592 /*
593 * In Renesas controllers, when performing a
594 * multiple block read of one or two blocks,
595 * depending on the timing with which the
596 * response register is read, the response
597 * value may not be read properly.
598 * Use single block read for this HW bug
599 */
600 if ((direction == MMC_DATA_READ) &&
601 blk_size == 2)
602 return 1;
603
604 return blk_size;
605}
606
607static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
608{
609 /* Iff regs are 8 byte apart, sdbuf is 64 bit. Otherwise always 32. */
610 int width = (host->bus_shift == 2) ? 64 : 32;
611
612 sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0);
613 renesas_sdhi_sdbuf_width(host, enable ? width : 16);
614}
615
616static const struct renesas_sdhi_quirks sdhi_quirks_4tap_nohs400 = {
617 .hs400_disabled = true,
618 .hs400_4taps = true,
619};
620
621static const struct renesas_sdhi_quirks sdhi_quirks_4tap = {
622 .hs400_4taps = true,
623};
624
625static const struct renesas_sdhi_quirks sdhi_quirks_nohs400 = {
626 .hs400_disabled = true,
627};
628
629static const struct soc_device_attribute sdhi_quirks_match[] = {
630 { .soc_id = "r8a7795", .revision = "ES1.*", .data = &sdhi_quirks_4tap_nohs400 },
631 { .soc_id = "r8a7795", .revision = "ES2.0", .data = &sdhi_quirks_4tap },
632 { .soc_id = "r8a7796", .revision = "ES1.[012]", .data = &sdhi_quirks_4tap_nohs400 },
633 { .soc_id = "r8a774a1", .revision = "ES1.[012]", .data = &sdhi_quirks_4tap_nohs400 },
634 { .soc_id = "r8a77980", .data = &sdhi_quirks_nohs400 },
635 { /* Sentinel. */ },
636};
637
638int renesas_sdhi_probe(struct platform_device *pdev,
639 const struct tmio_mmc_dma_ops *dma_ops)
640{
641 struct tmio_mmc_data *mmd = pdev->dev.platform_data;
642 const struct renesas_sdhi_quirks *quirks = NULL;
643 const struct renesas_sdhi_of_data *of_data;
644 const struct soc_device_attribute *attr;
645 struct tmio_mmc_data *mmc_data;
646 struct tmio_mmc_dma *dma_priv;
647 struct tmio_mmc_host *host;
648 struct renesas_sdhi *priv;
649 int num_irqs, irq, ret, i;
650 struct resource *res;
651 u16 ver;
652
653 of_data = of_device_get_match_data(&pdev->dev);
654
655 attr = soc_device_match(sdhi_quirks_match);
656 if (attr)
657 quirks = attr->data;
658
659 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
660 if (!res)
661 return -EINVAL;
662
663 priv = devm_kzalloc(&pdev->dev, sizeof(struct renesas_sdhi),
664 GFP_KERNEL);
665 if (!priv)
666 return -ENOMEM;
667
668 mmc_data = &priv->mmc_data;
669 dma_priv = &priv->dma_priv;
670
671 priv->clk = devm_clk_get(&pdev->dev, NULL);
672 if (IS_ERR(priv->clk)) {
673 ret = PTR_ERR(priv->clk);
674 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
675 return ret;
676 }
677
678 /*
679 * Some controllers provide a 2nd clock just to run the internal card
680 * detection logic. Unfortunately, the existing driver architecture does
681 * not support a separation of clocks for runtime PM usage. When
682 * native hotplug is used, the tmio driver assumes that the core
683 * must continue to run for card detect to stay active, so we cannot
684 * disable it.
685 * Additionally, it is prohibited to supply a clock to the core but not
686 * to the card detect circuit. That leaves us with if separate clocks
687 * are presented, we must treat them both as virtually 1 clock.
688 */
689 priv->clk_cd = devm_clk_get(&pdev->dev, "cd");
690 if (IS_ERR(priv->clk_cd))
691 priv->clk_cd = NULL;
692
693 priv->pinctrl = devm_pinctrl_get(&pdev->dev);
694 if (!IS_ERR(priv->pinctrl)) {
695 priv->pins_default = pinctrl_lookup_state(priv->pinctrl,
696 PINCTRL_STATE_DEFAULT);
697 priv->pins_uhs = pinctrl_lookup_state(priv->pinctrl,
698 "state_uhs");
699 }
700
701 host = tmio_mmc_host_alloc(pdev, mmc_data);
702 if (IS_ERR(host))
703 return PTR_ERR(host);
704
705 if (of_data) {
706 mmc_data->flags |= of_data->tmio_flags;
707 mmc_data->ocr_mask = of_data->tmio_ocr_mask;
708 mmc_data->capabilities |= of_data->capabilities;
709 mmc_data->capabilities2 |= of_data->capabilities2;
710 mmc_data->dma_rx_offset = of_data->dma_rx_offset;
711 mmc_data->max_blk_count = of_data->max_blk_count;
712 mmc_data->max_segs = of_data->max_segs;
713 dma_priv->dma_buswidth = of_data->dma_buswidth;
714 host->bus_shift = of_data->bus_shift;
715 }
716
717 host->write16_hook = renesas_sdhi_write16_hook;
718 host->clk_enable = renesas_sdhi_clk_enable;
719 host->clk_disable = renesas_sdhi_clk_disable;
720 host->set_clock = renesas_sdhi_set_clock;
721 host->multi_io_quirk = renesas_sdhi_multi_io_quirk;
722 host->dma_ops = dma_ops;
723
724 if (quirks && quirks->hs400_disabled)
725 host->mmc->caps2 &= ~(MMC_CAP2_HS400 | MMC_CAP2_HS400_ES);
726
727 if (quirks && quirks->hs400_4taps)
728 mmc_data->flags |= TMIO_MMC_HAVE_4TAP_HS400;
729
730 /* For some SoC, we disable internal WP. GPIO may override this */
731 if (mmc_can_gpio_ro(host->mmc))
732 mmc_data->capabilities2 &= ~MMC_CAP2_NO_WRITE_PROTECT;
733
734 /* SDR speeds are only available on Gen2+ */
735 if (mmc_data->flags & TMIO_MMC_MIN_RCAR2) {
736 /* card_busy caused issues on r8a73a4 (pre-Gen2) CD-less SDHI */
737 host->ops.card_busy = renesas_sdhi_card_busy;
738 host->ops.start_signal_voltage_switch =
739 renesas_sdhi_start_signal_voltage_switch;
740 host->sdcard_irq_setbit_mask = TMIO_STAT_ALWAYS_SET_27;
741
742 /* SDR and HS200/400 registers requires HW reset */
743 if (of_data && of_data->scc_offset) {
744 priv->scc_ctl = host->ctl + of_data->scc_offset;
745 host->mmc->caps |= MMC_CAP_HW_RESET;
746 host->hw_reset = renesas_sdhi_hw_reset;
747 }
748 }
749
750 /* Orginally registers were 16 bit apart, could be 32 or 64 nowadays */
751 if (!host->bus_shift && resource_size(res) > 0x100) /* old way to determine the shift */
752 host->bus_shift = 1;
753
754 if (mmd)
755 *mmc_data = *mmd;
756
757 dma_priv->filter = shdma_chan_filter;
758 dma_priv->enable = renesas_sdhi_enable_dma;
759
760 mmc_data->alignment_shift = 1; /* 2-byte alignment */
761 mmc_data->capabilities |= MMC_CAP_MMC_HIGHSPEED;
762
763 /*
764 * All SDHI blocks support 2-byte and larger block sizes in 4-bit
765 * bus width mode.
766 */
767 mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
768
769 /*
770 * All SDHI blocks support SDIO IRQ signalling.
771 */
772 mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
773
774 /* All SDHI have CMD12 control bit */
775 mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL;
776
777 /* All SDHI have SDIO status bits which must be 1 */
778 mmc_data->flags |= TMIO_MMC_SDIO_STATUS_SETBITS;
779
780 ret = renesas_sdhi_clk_enable(host);
781 if (ret)
782 goto efree;
783
784 ver = sd_ctrl_read16(host, CTL_VERSION);
785 /* GEN2_SDR104 is first known SDHI to use 32bit block count */
786 if (ver < SDHI_VER_GEN2_SDR104 && mmc_data->max_blk_count > U16_MAX)
787 mmc_data->max_blk_count = U16_MAX;
788
789 /* One Gen2 SDHI incarnation does NOT have a CBSY bit */
790 if (ver == SDHI_VER_GEN2_SDR50)
791 mmc_data->flags &= ~TMIO_MMC_HAVE_CBSY;
792
793 ret = tmio_mmc_host_probe(host);
794 if (ret < 0)
795 goto edisclk;
796
797 /* Enable tuning iff we have an SCC and a supported mode */
798 if (of_data && of_data->scc_offset &&
799 (host->mmc->caps & MMC_CAP_UHS_SDR104 ||
800 host->mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR |
801 MMC_CAP2_HS400_1_8V))) {
802 const struct renesas_sdhi_scc *taps = of_data->taps;
803 bool hit = false;
804
805 for (i = 0; i < of_data->taps_num; i++) {
806 if (taps[i].clk_rate == 0 ||
807 taps[i].clk_rate == host->mmc->f_max) {
808 priv->scc_tappos = taps->tap;
809 priv->scc_tappos_hs400 = taps->tap_hs400;
810 hit = true;
811 break;
812 }
813 }
814
815 if (!hit)
816 dev_warn(&host->pdev->dev, "Unknown clock rate for SDR104\n");
817
818 host->init_tuning = renesas_sdhi_init_tuning;
819 host->prepare_tuning = renesas_sdhi_prepare_tuning;
820 host->select_tuning = renesas_sdhi_select_tuning;
821 host->check_scc_error = renesas_sdhi_check_scc_error;
822 host->prepare_hs400_tuning =
823 renesas_sdhi_prepare_hs400_tuning;
824 host->hs400_downgrade = renesas_sdhi_disable_scc;
825 host->hs400_complete = renesas_sdhi_hs400_complete;
826 }
827
828 num_irqs = platform_irq_count(pdev);
829 if (num_irqs < 0) {
830 ret = num_irqs;
831 goto eirq;
832 }
833
834 /* There must be at least one IRQ source */
835 if (!num_irqs) {
836 ret = -ENXIO;
837 goto eirq;
838 }
839
840 for (i = 0; i < num_irqs; i++) {
841 irq = platform_get_irq(pdev, i);
842 if (irq < 0) {
843 ret = irq;
844 goto eirq;
845 }
846
847 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
848 dev_name(&pdev->dev), host);
849 if (ret)
850 goto eirq;
851 }
852
853 dev_info(&pdev->dev, "%s base at 0x%08lx max clock rate %u MHz\n",
854 mmc_hostname(host->mmc), (unsigned long)
855 (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
856 host->mmc->f_max / 1000000);
857
858 return ret;
859
860eirq:
861 tmio_mmc_host_remove(host);
862edisclk:
863 renesas_sdhi_clk_disable(host);
864efree:
865 tmio_mmc_host_free(host);
866
867 return ret;
868}
869EXPORT_SYMBOL_GPL(renesas_sdhi_probe);
870
871int renesas_sdhi_remove(struct platform_device *pdev)
872{
873 struct tmio_mmc_host *host = platform_get_drvdata(pdev);
874
875 tmio_mmc_host_remove(host);
876 renesas_sdhi_clk_disable(host);
877
878 return 0;
879}
880EXPORT_SYMBOL_GPL(renesas_sdhi_remove);
881
882MODULE_LICENSE("GPL v2");