1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) STMicroelectronics 2018 - All Rights Reserved
4 * Author: Ludovic.barre@st.com for STMicroelectronics.
5 */
6#include <linux/bitfield.h>
7#include <linux/delay.h>
8#include <linux/dma-mapping.h>
9#include <linux/iopoll.h>
10#include <linux/mmc/host.h>
11#include <linux/mmc/card.h>
12#include <linux/of_address.h>
13#include <linux/reset.h>
14#include <linux/scatterlist.h>
15#include "mmci.h"
16
17#define SDMMC_LLI_BUF_LEN PAGE_SIZE
18
19#define DLYB_CR 0x0
20#define DLYB_CR_DEN BIT(0)
21#define DLYB_CR_SEN BIT(1)
22
23#define DLYB_CFGR 0x4
24#define DLYB_CFGR_SEL_MASK GENMASK(3, 0)
25#define DLYB_CFGR_UNIT_MASK GENMASK(14, 8)
26#define DLYB_CFGR_LNG_MASK GENMASK(27, 16)
27#define DLYB_CFGR_LNGF BIT(31)
28
29#define DLYB_NB_DELAY 11
30#define DLYB_CFGR_SEL_MAX (DLYB_NB_DELAY + 1)
31#define DLYB_CFGR_UNIT_MAX 127
32
33#define DLYB_LNG_TIMEOUT_US 1000
34#define SDMMC_VSWEND_TIMEOUT_US 10000
35
36#define SYSCFG_DLYBSD_CR 0x0
37#define DLYBSD_CR_EN BIT(0)
38#define DLYBSD_CR_RXTAPSEL_MASK GENMASK(6, 1)
39#define DLYBSD_TAPSEL_NB 32
40#define DLYBSD_BYP_EN BIT(16)
41#define DLYBSD_BYP_CMD GENMASK(21, 17)
42#define DLYBSD_ANTIGLITCH_EN BIT(22)
43
44#define SYSCFG_DLYBSD_SR 0x4
45#define DLYBSD_SR_LOCK BIT(0)
46#define DLYBSD_SR_RXTAPSEL_ACK BIT(1)
47
48#define DLYBSD_TIMEOUT_1S_IN_US 1000000
49
50struct sdmmc_lli_desc {
51 u32 idmalar;
52 u32 idmabase;
53 u32 idmasize;
54};
55
56struct sdmmc_idma {
57 dma_addr_t sg_dma;
58 void *sg_cpu;
59 dma_addr_t bounce_dma_addr;
60 void *bounce_buf;
61 bool use_bounce_buffer;
62};
63
64struct sdmmc_dlyb;
65
66struct sdmmc_tuning_ops {
67 int (*dlyb_enable)(struct sdmmc_dlyb *dlyb);
68 void (*set_input_ck)(struct sdmmc_dlyb *dlyb);
69 int (*tuning_prepare)(struct mmci_host *host);
70 int (*set_cfg)(struct sdmmc_dlyb *dlyb, int unit __maybe_unused,
71 int phase, bool sampler __maybe_unused);
72};
73
74struct sdmmc_dlyb {
75 void __iomem *base;
76 u32 unit;
77 u32 max;
78 struct sdmmc_tuning_ops *ops;
79};
80
81static int sdmmc_idma_validate_data(struct mmci_host *host,
82 struct mmc_data *data)
83{
84 struct sdmmc_idma *idma = host->dma_priv;
85 struct device *dev = mmc_dev(host->mmc);
86 struct scatterlist *sg;
87 int i;
88
89 /*
90 * idma has constraints on idmabase & idmasize for each element
91 * excepted the last element which has no constraint on idmasize
92 */
93 idma->use_bounce_buffer = false;
94 for_each_sg(data->sg, sg, data->sg_len - 1, i) {
95 if (!IS_ALIGNED(sg->offset, sizeof(u32)) ||
96 !IS_ALIGNED(sg->length,
97 host->variant->stm32_idmabsize_align)) {
98 dev_dbg(mmc_dev(host->mmc),
99 "unaligned scatterlist: ofst:%x length:%d\n",
100 data->sg->offset, data->sg->length);
101 goto use_bounce_buffer;
102 }
103 }
104
105 if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
106 dev_dbg(mmc_dev(host->mmc),
107 "unaligned last scatterlist: ofst:%x length:%d\n",
108 data->sg->offset, data->sg->length);
109 goto use_bounce_buffer;
110 }
111
112 return 0;
113
114use_bounce_buffer:
115 if (!idma->bounce_buf) {
116 idma->bounce_buf = dmam_alloc_coherent(dev,
117 size: host->mmc->max_req_size,
118 dma_handle: &idma->bounce_dma_addr,
119 GFP_KERNEL);
120 if (!idma->bounce_buf) {
121 dev_err(dev, "Unable to map allocate DMA bounce buffer.\n");
122 return -ENOMEM;
123 }
124 }
125
126 idma->use_bounce_buffer = true;
127
128 return 0;
129}
130
131static int _sdmmc_idma_prep_data(struct mmci_host *host,
132 struct mmc_data *data)
133{
134 struct sdmmc_idma *idma = host->dma_priv;
135
136 if (idma->use_bounce_buffer) {
137 if (data->flags & MMC_DATA_WRITE) {
138 unsigned int xfer_bytes = data->blksz * data->blocks;
139
140 sg_copy_to_buffer(sgl: data->sg, nents: data->sg_len,
141 buf: idma->bounce_buf, buflen: xfer_bytes);
142 dma_wmb();
143 }
144 } else {
145 int n_elem;
146
147 n_elem = dma_map_sg(mmc_dev(host->mmc),
148 data->sg,
149 data->sg_len,
150 mmc_get_dma_dir(data));
151
152 if (!n_elem) {
153 dev_err(mmc_dev(host->mmc), "dma_map_sg failed\n");
154 return -EINVAL;
155 }
156 }
157 return 0;
158}
159
160static int sdmmc_idma_prep_data(struct mmci_host *host,
161 struct mmc_data *data, bool next)
162{
163 /* Check if job is already prepared. */
164 if (!next && data->host_cookie == host->next_cookie)
165 return 0;
166
167 return _sdmmc_idma_prep_data(host, data);
168}
169
170static void sdmmc_idma_unprep_data(struct mmci_host *host,
171 struct mmc_data *data, int err)
172{
173 struct sdmmc_idma *idma = host->dma_priv;
174
175 if (idma->use_bounce_buffer) {
176 if (data->flags & MMC_DATA_READ) {
177 unsigned int xfer_bytes = data->blksz * data->blocks;
178
179 sg_copy_from_buffer(sgl: data->sg, nents: data->sg_len,
180 buf: idma->bounce_buf, buflen: xfer_bytes);
181 }
182 } else {
183 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
184 mmc_get_dma_dir(data));
185 }
186}
187
188static int sdmmc_idma_setup(struct mmci_host *host)
189{
190 struct sdmmc_idma *idma;
191 struct device *dev = mmc_dev(host->mmc);
192
193 idma = devm_kzalloc(dev, size: sizeof(*idma), GFP_KERNEL);
194 if (!idma)
195 return -ENOMEM;
196
197 host->dma_priv = idma;
198
199 if (host->variant->dma_lli) {
200 idma->sg_cpu = dmam_alloc_coherent(dev, SDMMC_LLI_BUF_LEN,
201 dma_handle: &idma->sg_dma, GFP_KERNEL);
202 if (!idma->sg_cpu) {
203 dev_err(dev, "Failed to alloc IDMA descriptor\n");
204 return -ENOMEM;
205 }
206 host->mmc->max_segs = SDMMC_LLI_BUF_LEN /
207 sizeof(struct sdmmc_lli_desc);
208 host->mmc->max_seg_size = host->variant->stm32_idmabsize_mask;
209
210 host->mmc->max_req_size = SZ_1M;
211 } else {
212 host->mmc->max_segs = 1;
213 host->mmc->max_seg_size = host->mmc->max_req_size;
214 }
215
216 return dma_set_max_seg_size(dev, size: host->mmc->max_seg_size);
217}
218
219static int sdmmc_idma_start(struct mmci_host *host, unsigned int *datactrl)
220
221{
222 struct sdmmc_idma *idma = host->dma_priv;
223 struct sdmmc_lli_desc *desc = (struct sdmmc_lli_desc *)idma->sg_cpu;
224 struct mmc_data *data = host->data;
225 struct scatterlist *sg;
226 int i;
227
228 if (!host->variant->dma_lli || data->sg_len == 1 ||
229 idma->use_bounce_buffer) {
230 u32 dma_addr;
231
232 if (idma->use_bounce_buffer)
233 dma_addr = idma->bounce_dma_addr;
234 else
235 dma_addr = sg_dma_address(data->sg);
236
237 writel_relaxed(dma_addr,
238 host->base + MMCI_STM32_IDMABASE0R);
239 writel_relaxed(MMCI_STM32_IDMAEN,
240 host->base + MMCI_STM32_IDMACTRLR);
241 return 0;
242 }
243
244 for_each_sg(data->sg, sg, data->sg_len, i) {
245 desc[i].idmalar = (i + 1) * sizeof(struct sdmmc_lli_desc);
246 desc[i].idmalar |= MMCI_STM32_ULA | MMCI_STM32_ULS
247 | MMCI_STM32_ABR;
248 desc[i].idmabase = sg_dma_address(sg);
249 desc[i].idmasize = sg_dma_len(sg);
250 }
251
252 /* notice the end of link list */
253 desc[data->sg_len - 1].idmalar &= ~MMCI_STM32_ULA;
254
255 dma_wmb();
256 writel_relaxed(idma->sg_dma, host->base + MMCI_STM32_IDMABAR);
257 writel_relaxed(desc[0].idmalar, host->base + MMCI_STM32_IDMALAR);
258 writel_relaxed(desc[0].idmabase, host->base + MMCI_STM32_IDMABASE0R);
259 writel_relaxed(desc[0].idmasize, host->base + MMCI_STM32_IDMABSIZER);
260 writel_relaxed(MMCI_STM32_IDMAEN | MMCI_STM32_IDMALLIEN,
261 host->base + MMCI_STM32_IDMACTRLR);
262
263 return 0;
264}
265
266static void sdmmc_idma_finalize(struct mmci_host *host, struct mmc_data *data)
267{
268 writel_relaxed(0, host->base + MMCI_STM32_IDMACTRLR);
269
270 if (!data->host_cookie)
271 sdmmc_idma_unprep_data(host, data, err: 0);
272}
273
274static void mmci_sdmmc_set_clkreg(struct mmci_host *host, unsigned int desired)
275{
276 unsigned int clk = 0, ddr = 0;
277
278 if (host->mmc->ios.timing == MMC_TIMING_MMC_DDR52 ||
279 host->mmc->ios.timing == MMC_TIMING_UHS_DDR50)
280 ddr = MCI_STM32_CLK_DDR;
281
282 /*
283 * cclk = mclk / (2 * clkdiv)
284 * clkdiv 0 => bypass
285 * in ddr mode bypass is not possible
286 */
287 if (desired) {
288 if (desired >= host->mclk && !ddr) {
289 host->cclk = host->mclk;
290 } else {
291 clk = DIV_ROUND_UP(host->mclk, 2 * desired);
292 if (clk > MCI_STM32_CLK_CLKDIV_MSK)
293 clk = MCI_STM32_CLK_CLKDIV_MSK;
294 host->cclk = host->mclk / (2 * clk);
295 }
296 } else {
297 /*
298 * while power-on phase the clock can't be define to 0,
299 * Only power-off and power-cyc deactivate the clock.
300 * if desired clock is 0, set max divider
301 */
302 clk = MCI_STM32_CLK_CLKDIV_MSK;
303 host->cclk = host->mclk / (2 * clk);
304 }
305
306 /* Set actual clock for debug */
307 if (host->mmc->ios.power_mode == MMC_POWER_ON)
308 host->mmc->actual_clock = host->cclk;
309 else
310 host->mmc->actual_clock = 0;
311
312 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
313 clk |= MCI_STM32_CLK_WIDEBUS_4;
314 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
315 clk |= MCI_STM32_CLK_WIDEBUS_8;
316
317 clk |= MCI_STM32_CLK_HWFCEN;
318 clk |= host->clk_reg_add;
319 clk |= ddr;
320
321 if (host->mmc->ios.timing >= MMC_TIMING_UHS_SDR50)
322 clk |= MCI_STM32_CLK_BUSSPEED;
323
324 mmci_write_clkreg(host, clk);
325}
326
327static void sdmmc_dlyb_mp15_input_ck(struct sdmmc_dlyb *dlyb)
328{
329 if (!dlyb || !dlyb->base)
330 return;
331
332 /* Output clock = Input clock */
333 writel_relaxed(0, dlyb->base + DLYB_CR);
334}
335
336static void mmci_sdmmc_set_pwrreg(struct mmci_host *host, unsigned int pwr)
337{
338 struct mmc_ios ios = host->mmc->ios;
339 struct sdmmc_dlyb *dlyb = host->variant_priv;
340
341 /* adds OF options */
342 pwr = host->pwr_reg_add;
343
344 if (dlyb && dlyb->ops->set_input_ck)
345 dlyb->ops->set_input_ck(dlyb);
346
347 if (ios.power_mode == MMC_POWER_OFF) {
348 /* Only a reset could power-off sdmmc */
349 reset_control_assert(rstc: host->rst);
350 udelay(2);
351 reset_control_deassert(rstc: host->rst);
352
353 /*
354 * Set the SDMMC in Power-cycle state.
355 * This will make that the SDMMC_D[7:0], SDMMC_CMD and SDMMC_CK
356 * are driven low, to prevent the Card from being supplied
357 * through the signal lines.
358 */
359 mmci_write_pwrreg(host, MCI_STM32_PWR_CYC | pwr);
360 } else if (ios.power_mode == MMC_POWER_ON) {
361 /*
362 * After power-off (reset): the irq mask defined in probe
363 * functionis lost
364 * ault irq mask (probe) must be activated
365 */
366 writel(MCI_IRQENABLE | host->variant->start_err,
367 addr: host->base + MMCIMASK0);
368
369 /* preserves voltage switch bits */
370 pwr |= host->pwr_reg & (MCI_STM32_VSWITCHEN |
371 MCI_STM32_VSWITCH);
372
373 /*
374 * After a power-cycle state, we must set the SDMMC in
375 * Power-off. The SDMMC_D[7:0], SDMMC_CMD and SDMMC_CK are
376 * driven high. Then we can set the SDMMC to Power-on state
377 */
378 mmci_write_pwrreg(host, MCI_PWR_OFF | pwr);
379 mdelay(1);
380 mmci_write_pwrreg(host, MCI_PWR_ON | pwr);
381 }
382}
383
384static u32 sdmmc_get_dctrl_cfg(struct mmci_host *host)
385{
386 u32 datactrl;
387
388 datactrl = mmci_dctrl_blksz(host);
389
390 if (host->hw_revision >= 3) {
391 u32 thr = 0;
392
393 if (host->mmc->ios.timing == MMC_TIMING_UHS_SDR104 ||
394 host->mmc->ios.timing == MMC_TIMING_MMC_HS200) {
395 thr = ffs(min_t(unsigned int, host->data->blksz,
396 host->variant->fifosize));
397 thr = min_t(u32, thr, MMCI_STM32_THR_MASK);
398 }
399
400 writel_relaxed(thr, host->base + MMCI_STM32_FIFOTHRR);
401 }
402
403 if (host->mmc->card && mmc_card_sdio(host->mmc->card) &&
404 host->data->blocks == 1)
405 datactrl |= MCI_DPSM_STM32_MODE_SDIO;
406 else if (host->data->stop && !host->mrq->sbc)
407 datactrl |= MCI_DPSM_STM32_MODE_BLOCK_STOP;
408 else
409 datactrl |= MCI_DPSM_STM32_MODE_BLOCK;
410
411 return datactrl;
412}
413
414static bool sdmmc_busy_complete(struct mmci_host *host, struct mmc_command *cmd,
415 u32 status, u32 err_msk)
416{
417 void __iomem *base = host->base;
418 u32 busy_d0, busy_d0end, mask, sdmmc_status;
419
420 mask = readl_relaxed(base + MMCIMASK0);
421 sdmmc_status = readl_relaxed(base + MMCISTATUS);
422 busy_d0end = sdmmc_status & MCI_STM32_BUSYD0END;
423 busy_d0 = sdmmc_status & MCI_STM32_BUSYD0;
424
425 /* complete if there is an error or busy_d0end */
426 if ((status & err_msk) || busy_d0end)
427 goto complete;
428
429 /*
430 * On response the busy signaling is reflected in the BUSYD0 flag.
431 * if busy_d0 is in-progress we must activate busyd0end interrupt
432 * to wait this completion. Else this request has no busy step.
433 */
434 if (busy_d0) {
435 if (!host->busy_status) {
436 writel_relaxed(mask | host->variant->busy_detect_mask,
437 base + MMCIMASK0);
438 host->busy_status = status &
439 (MCI_CMDSENT | MCI_CMDRESPEND);
440 }
441 return false;
442 }
443
444complete:
445 if (host->busy_status) {
446 writel_relaxed(mask & ~host->variant->busy_detect_mask,
447 base + MMCIMASK0);
448 host->busy_status = 0;
449 }
450
451 writel_relaxed(host->variant->busy_detect_mask, base + MMCICLEAR);
452
453 return true;
454}
455
456static int sdmmc_dlyb_mp15_enable(struct sdmmc_dlyb *dlyb)
457{
458 writel_relaxed(DLYB_CR_DEN, dlyb->base + DLYB_CR);
459
460 return 0;
461}
462
463static int sdmmc_dlyb_mp15_set_cfg(struct sdmmc_dlyb *dlyb,
464 int unit, int phase, bool sampler)
465{
466 u32 cfgr;
467
468 writel_relaxed(DLYB_CR_SEN | DLYB_CR_DEN, dlyb->base + DLYB_CR);
469
470 cfgr = FIELD_PREP(DLYB_CFGR_UNIT_MASK, unit) |
471 FIELD_PREP(DLYB_CFGR_SEL_MASK, phase);
472 writel_relaxed(cfgr, dlyb->base + DLYB_CFGR);
473
474 if (!sampler)
475 writel_relaxed(DLYB_CR_DEN, dlyb->base + DLYB_CR);
476
477 return 0;
478}
479
480static int sdmmc_dlyb_mp15_prepare(struct mmci_host *host)
481{
482 struct sdmmc_dlyb *dlyb = host->variant_priv;
483 u32 cfgr;
484 int i, lng, ret;
485
486 for (i = 0; i <= DLYB_CFGR_UNIT_MAX; i++) {
487 dlyb->ops->set_cfg(dlyb, i, DLYB_CFGR_SEL_MAX, true);
488
489 ret = readl_relaxed_poll_timeout(dlyb->base + DLYB_CFGR, cfgr,
490 (cfgr & DLYB_CFGR_LNGF),
491 1, DLYB_LNG_TIMEOUT_US);
492 if (ret) {
493 dev_warn(mmc_dev(host->mmc),
494 "delay line cfg timeout unit:%d cfgr:%d\n",
495 i, cfgr);
496 continue;
497 }
498
499 lng = FIELD_GET(DLYB_CFGR_LNG_MASK, cfgr);
500 if (lng < BIT(DLYB_NB_DELAY) && lng > 0)
501 break;
502 }
503
504 if (i > DLYB_CFGR_UNIT_MAX)
505 return -EINVAL;
506
507 dlyb->unit = i;
508 dlyb->max = __fls(word: lng);
509
510 return 0;
511}
512
513static int sdmmc_dlyb_mp25_enable(struct sdmmc_dlyb *dlyb)
514{
515 u32 cr, sr;
516
517 cr = readl_relaxed(dlyb->base + SYSCFG_DLYBSD_CR);
518 cr |= DLYBSD_CR_EN;
519
520 writel_relaxed(cr, dlyb->base + SYSCFG_DLYBSD_CR);
521
522 return readl_relaxed_poll_timeout(dlyb->base + SYSCFG_DLYBSD_SR,
523 sr, sr & DLYBSD_SR_LOCK, 1,
524 DLYBSD_TIMEOUT_1S_IN_US);
525}
526
527static int sdmmc_dlyb_mp25_set_cfg(struct sdmmc_dlyb *dlyb,
528 int unit __maybe_unused, int phase,
529 bool sampler __maybe_unused)
530{
531 u32 cr, sr;
532
533 cr = readl_relaxed(dlyb->base + SYSCFG_DLYBSD_CR);
534 cr &= ~DLYBSD_CR_RXTAPSEL_MASK;
535 cr |= FIELD_PREP(DLYBSD_CR_RXTAPSEL_MASK, phase);
536
537 writel_relaxed(cr, dlyb->base + SYSCFG_DLYBSD_CR);
538
539 return readl_relaxed_poll_timeout(dlyb->base + SYSCFG_DLYBSD_SR,
540 sr, sr & DLYBSD_SR_RXTAPSEL_ACK, 1,
541 DLYBSD_TIMEOUT_1S_IN_US);
542}
543
544static int sdmmc_dlyb_mp25_prepare(struct mmci_host *host)
545{
546 struct sdmmc_dlyb *dlyb = host->variant_priv;
547
548 dlyb->max = DLYBSD_TAPSEL_NB;
549
550 return 0;
551}
552
553static int sdmmc_dlyb_phase_tuning(struct mmci_host *host, u32 opcode)
554{
555 struct sdmmc_dlyb *dlyb = host->variant_priv;
556 int cur_len = 0, max_len = 0, end_of_len = 0;
557 int phase, ret;
558
559 for (phase = 0; phase <= dlyb->max; phase++) {
560 ret = dlyb->ops->set_cfg(dlyb, dlyb->unit, phase, false);
561 if (ret) {
562 dev_err(mmc_dev(host->mmc), "tuning config failed\n");
563 return ret;
564 }
565
566 if (mmc_send_tuning(host: host->mmc, opcode, NULL)) {
567 cur_len = 0;
568 } else {
569 cur_len++;
570 if (cur_len > max_len) {
571 max_len = cur_len;
572 end_of_len = phase;
573 }
574 }
575 }
576
577 if (!max_len) {
578 dev_err(mmc_dev(host->mmc), "no tuning point found\n");
579 return -EINVAL;
580 }
581
582 if (dlyb->ops->set_input_ck)
583 dlyb->ops->set_input_ck(dlyb);
584
585 phase = end_of_len - max_len / 2;
586 ret = dlyb->ops->set_cfg(dlyb, dlyb->unit, phase, false);
587 if (ret) {
588 dev_err(mmc_dev(host->mmc), "tuning reconfig failed\n");
589 return ret;
590 }
591
592 dev_dbg(mmc_dev(host->mmc), "unit:%d max_dly:%d phase:%d\n",
593 dlyb->unit, dlyb->max, phase);
594
595 return 0;
596}
597
598static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
599{
600 struct mmci_host *host = mmc_priv(host: mmc);
601 struct sdmmc_dlyb *dlyb = host->variant_priv;
602 u32 clk;
603 int ret;
604
605 if ((host->mmc->ios.timing != MMC_TIMING_UHS_SDR104 &&
606 host->mmc->ios.timing != MMC_TIMING_MMC_HS200) ||
607 host->mmc->actual_clock <= 50000000)
608 return 0;
609
610 if (!dlyb || !dlyb->base)
611 return -EINVAL;
612
613 ret = dlyb->ops->dlyb_enable(dlyb);
614 if (ret)
615 return ret;
616
617 /*
618 * SDMMC_FBCK is selected when an external Delay Block is needed
619 * with SDR104 or HS200.
620 */
621 clk = host->clk_reg;
622 clk &= ~MCI_STM32_CLK_SEL_MSK;
623 clk |= MCI_STM32_CLK_SELFBCK;
624 mmci_write_clkreg(host, clk);
625
626 ret = dlyb->ops->tuning_prepare(host);
627 if (ret)
628 return ret;
629
630 return sdmmc_dlyb_phase_tuning(host, opcode);
631}
632
633static void sdmmc_pre_sig_volt_vswitch(struct mmci_host *host)
634{
635 /* clear the voltage switch completion flag */
636 writel_relaxed(MCI_STM32_VSWENDC, host->base + MMCICLEAR);
637 /* enable Voltage switch procedure */
638 mmci_write_pwrreg(host, pwr: host->pwr_reg | MCI_STM32_VSWITCHEN);
639}
640
641static int sdmmc_post_sig_volt_switch(struct mmci_host *host,
642 struct mmc_ios *ios)
643{
644 unsigned long flags;
645 u32 status;
646 int ret = 0;
647
648 spin_lock_irqsave(&host->lock, flags);
649 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180 &&
650 host->pwr_reg & MCI_STM32_VSWITCHEN) {
651 mmci_write_pwrreg(host, pwr: host->pwr_reg | MCI_STM32_VSWITCH);
652 spin_unlock_irqrestore(lock: &host->lock, flags);
653
654 /* wait voltage switch completion while 10ms */
655 ret = readl_relaxed_poll_timeout(host->base + MMCISTATUS,
656 status,
657 (status & MCI_STM32_VSWEND),
658 10, SDMMC_VSWEND_TIMEOUT_US);
659
660 writel_relaxed(MCI_STM32_VSWENDC | MCI_STM32_CKSTOPC,
661 host->base + MMCICLEAR);
662 spin_lock_irqsave(&host->lock, flags);
663 mmci_write_pwrreg(host, pwr: host->pwr_reg &
664 ~(MCI_STM32_VSWITCHEN | MCI_STM32_VSWITCH));
665 }
666 spin_unlock_irqrestore(lock: &host->lock, flags);
667
668 return ret;
669}
670
671static struct mmci_host_ops sdmmc_variant_ops = {
672 .validate_data = sdmmc_idma_validate_data,
673 .prep_data = sdmmc_idma_prep_data,
674 .unprep_data = sdmmc_idma_unprep_data,
675 .get_datactrl_cfg = sdmmc_get_dctrl_cfg,
676 .dma_setup = sdmmc_idma_setup,
677 .dma_start = sdmmc_idma_start,
678 .dma_finalize = sdmmc_idma_finalize,
679 .set_clkreg = mmci_sdmmc_set_clkreg,
680 .set_pwrreg = mmci_sdmmc_set_pwrreg,
681 .busy_complete = sdmmc_busy_complete,
682 .pre_sig_volt_switch = sdmmc_pre_sig_volt_vswitch,
683 .post_sig_volt_switch = sdmmc_post_sig_volt_switch,
684};
685
686static struct sdmmc_tuning_ops dlyb_tuning_mp15_ops = {
687 .dlyb_enable = sdmmc_dlyb_mp15_enable,
688 .set_input_ck = sdmmc_dlyb_mp15_input_ck,
689 .tuning_prepare = sdmmc_dlyb_mp15_prepare,
690 .set_cfg = sdmmc_dlyb_mp15_set_cfg,
691};
692
693static struct sdmmc_tuning_ops dlyb_tuning_mp25_ops = {
694 .dlyb_enable = sdmmc_dlyb_mp25_enable,
695 .tuning_prepare = sdmmc_dlyb_mp25_prepare,
696 .set_cfg = sdmmc_dlyb_mp25_set_cfg,
697};
698
699void sdmmc_variant_init(struct mmci_host *host)
700{
701 struct device_node *np = host->mmc->parent->of_node;
702 void __iomem *base_dlyb;
703 struct sdmmc_dlyb *dlyb;
704
705 host->ops = &sdmmc_variant_ops;
706 host->pwr_reg = readl_relaxed(host->base + MMCIPOWER);
707
708 base_dlyb = devm_of_iomap(mmc_dev(host->mmc), node: np, index: 1, NULL);
709 if (IS_ERR(ptr: base_dlyb))
710 return;
711
712 dlyb = devm_kzalloc(mmc_dev(host->mmc), size: sizeof(*dlyb), GFP_KERNEL);
713 if (!dlyb)
714 return;
715
716 dlyb->base = base_dlyb;
717 if (of_device_is_compatible(device: np, "st,stm32mp25-sdmmc2"))
718 dlyb->ops = &dlyb_tuning_mp25_ops;
719 else
720 dlyb->ops = &dlyb_tuning_mp15_ops;
721
722 host->variant_priv = dlyb;
723 host->mmc_ops->execute_tuning = sdmmc_execute_tuning;
724}
725

source code of linux/drivers/mmc/host/mmci_stm32_sdmmc.c