1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (C) 2017-2018 Socionext Inc.
4 // Author: Masahiro Yamada <yamada.masahiro@socionext.com>
5
6 #include <linux/bitfield.h>
7 #include <linux/bitops.h>
8 #include <linux/clk.h>
9 #include <linux/delay.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/mfd/tmio.h>
12 #include <linux/mmc/host.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/of_device.h>
16 #include <linux/pinctrl/consumer.h>
17 #include <linux/platform_device.h>
18 #include <linux/reset.h>
19
20 #include "tmio_mmc.h"
21
22 #define UNIPHIER_SD_CLK_CTL_DIV1024 BIT(16)
23 #define UNIPHIER_SD_CLK_CTL_DIV1 BIT(10)
24 #define UNIPHIER_SD_CLKCTL_OFFEN BIT(9) // auto SDCLK stop
25 #define UNIPHIER_SD_CC_EXT_MODE 0x1b0
26 #define UNIPHIER_SD_CC_EXT_MODE_DMA BIT(1)
27 #define UNIPHIER_SD_HOST_MODE 0x1c8
28 #define UNIPHIER_SD_VOLT 0x1e4
29 #define UNIPHIER_SD_VOLT_MASK GENMASK(1, 0)
30 #define UNIPHIER_SD_VOLT_OFF 0
31 #define UNIPHIER_SD_VOLT_330 1 // 3.3V signal
32 #define UNIPHIER_SD_VOLT_180 2 // 1.8V signal
33 #define UNIPHIER_SD_DMA_MODE 0x410
34 #define UNIPHIER_SD_DMA_MODE_DIR_MASK GENMASK(17, 16)
35 #define UNIPHIER_SD_DMA_MODE_DIR_TO_DEV 0
36 #define UNIPHIER_SD_DMA_MODE_DIR_FROM_DEV 1
37 #define UNIPHIER_SD_DMA_MODE_WIDTH_MASK GENMASK(5, 4)
38 #define UNIPHIER_SD_DMA_MODE_WIDTH_8 0
39 #define UNIPHIER_SD_DMA_MODE_WIDTH_16 1
40 #define UNIPHIER_SD_DMA_MODE_WIDTH_32 2
41 #define UNIPHIER_SD_DMA_MODE_WIDTH_64 3
42 #define UNIPHIER_SD_DMA_MODE_ADDR_INC BIT(0) // 1: inc, 0: fixed
43 #define UNIPHIER_SD_DMA_CTL 0x414
44 #define UNIPHIER_SD_DMA_CTL_START BIT(0) // start DMA (auto cleared)
45 #define UNIPHIER_SD_DMA_RST 0x418
46 #define UNIPHIER_SD_DMA_RST_CH1 BIT(9)
47 #define UNIPHIER_SD_DMA_RST_CH0 BIT(8)
48 #define UNIPHIER_SD_DMA_ADDR_L 0x440
49 #define UNIPHIER_SD_DMA_ADDR_H 0x444
50
51 /*
52 * IP is extended to support various features: built-in DMA engine,
53 * 1/1024 divisor, etc.
54 */
55 #define UNIPHIER_SD_CAP_EXTENDED_IP BIT(0)
56 /* RX channel of the built-in DMA controller is broken (Pro5) */
57 #define UNIPHIER_SD_CAP_BROKEN_DMA_RX BIT(1)
58
59 struct uniphier_sd_priv {
60 struct tmio_mmc_data tmio_data;
61 struct pinctrl *pinctrl;
62 struct pinctrl_state *pinstate_uhs;
63 struct clk *clk;
64 struct reset_control *rst;
65 struct reset_control *rst_br;
66 struct reset_control *rst_hw;
67 struct dma_chan *chan;
68 enum dma_data_direction dma_dir;
69 unsigned long clk_rate;
70 unsigned long caps;
71 };
72
uniphier_sd_priv(struct tmio_mmc_host * host)73 static void *uniphier_sd_priv(struct tmio_mmc_host *host)
74 {
75 return container_of(host->pdata, struct uniphier_sd_priv, tmio_data);
76 }
77
uniphier_sd_dma_endisable(struct tmio_mmc_host * host,int enable)78 static void uniphier_sd_dma_endisable(struct tmio_mmc_host *host, int enable)
79 {
80 sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0);
81 }
82
83 /* external DMA engine */
uniphier_sd_external_dma_issue(struct tasklet_struct * t)84 static void uniphier_sd_external_dma_issue(struct tasklet_struct *t)
85 {
86 struct tmio_mmc_host *host = from_tasklet(host, t, dma_issue);
87 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
88
89 uniphier_sd_dma_endisable(host, 1);
90 dma_async_issue_pending(priv->chan);
91 }
92
uniphier_sd_external_dma_callback(void * param,const struct dmaengine_result * result)93 static void uniphier_sd_external_dma_callback(void *param,
94 const struct dmaengine_result *result)
95 {
96 struct tmio_mmc_host *host = param;
97 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
98 unsigned long flags;
99
100 dma_unmap_sg(mmc_dev(host->mmc), host->sg_ptr, host->sg_len,
101 priv->dma_dir);
102
103 spin_lock_irqsave(&host->lock, flags);
104
105 if (result->result == DMA_TRANS_NOERROR) {
106 /*
107 * When the external DMA engine is enabled, strangely enough,
108 * the DATAEND flag can be asserted even if the DMA engine has
109 * not been kicked yet. Enable the TMIO_STAT_DATAEND irq only
110 * after we make sure the DMA engine finishes the transfer,
111 * hence, in this callback.
112 */
113 tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
114 } else {
115 host->data->error = -ETIMEDOUT;
116 tmio_mmc_do_data_irq(host);
117 }
118
119 spin_unlock_irqrestore(&host->lock, flags);
120 }
121
uniphier_sd_external_dma_start(struct tmio_mmc_host * host,struct mmc_data * data)122 static void uniphier_sd_external_dma_start(struct tmio_mmc_host *host,
123 struct mmc_data *data)
124 {
125 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
126 enum dma_transfer_direction dma_tx_dir;
127 struct dma_async_tx_descriptor *desc;
128 dma_cookie_t cookie;
129 int sg_len;
130
131 if (!priv->chan)
132 goto force_pio;
133
134 if (data->flags & MMC_DATA_READ) {
135 priv->dma_dir = DMA_FROM_DEVICE;
136 dma_tx_dir = DMA_DEV_TO_MEM;
137 } else {
138 priv->dma_dir = DMA_TO_DEVICE;
139 dma_tx_dir = DMA_MEM_TO_DEV;
140 }
141
142 sg_len = dma_map_sg(mmc_dev(host->mmc), host->sg_ptr, host->sg_len,
143 priv->dma_dir);
144 if (sg_len == 0)
145 goto force_pio;
146
147 desc = dmaengine_prep_slave_sg(priv->chan, host->sg_ptr, sg_len,
148 dma_tx_dir, DMA_CTRL_ACK);
149 if (!desc)
150 goto unmap_sg;
151
152 desc->callback_result = uniphier_sd_external_dma_callback;
153 desc->callback_param = host;
154
155 cookie = dmaengine_submit(desc);
156 if (cookie < 0)
157 goto unmap_sg;
158
159 host->dma_on = true;
160
161 return;
162
163 unmap_sg:
164 dma_unmap_sg(mmc_dev(host->mmc), host->sg_ptr, host->sg_len,
165 priv->dma_dir);
166 force_pio:
167 uniphier_sd_dma_endisable(host, 0);
168 }
169
uniphier_sd_external_dma_enable(struct tmio_mmc_host * host,bool enable)170 static void uniphier_sd_external_dma_enable(struct tmio_mmc_host *host,
171 bool enable)
172 {
173 }
174
uniphier_sd_external_dma_request(struct tmio_mmc_host * host,struct tmio_mmc_data * pdata)175 static void uniphier_sd_external_dma_request(struct tmio_mmc_host *host,
176 struct tmio_mmc_data *pdata)
177 {
178 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
179 struct dma_chan *chan;
180
181 chan = dma_request_chan(mmc_dev(host->mmc), "rx-tx");
182 if (IS_ERR(chan)) {
183 dev_warn(mmc_dev(host->mmc),
184 "failed to request DMA channel. falling back to PIO\n");
185 return; /* just use PIO even for -EPROBE_DEFER */
186 }
187
188 /* this driver uses a single channel for both RX an TX */
189 priv->chan = chan;
190 host->chan_rx = chan;
191 host->chan_tx = chan;
192
193 tasklet_setup(&host->dma_issue, uniphier_sd_external_dma_issue);
194 }
195
uniphier_sd_external_dma_release(struct tmio_mmc_host * host)196 static void uniphier_sd_external_dma_release(struct tmio_mmc_host *host)
197 {
198 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
199
200 if (priv->chan)
201 dma_release_channel(priv->chan);
202 }
203
uniphier_sd_external_dma_abort(struct tmio_mmc_host * host)204 static void uniphier_sd_external_dma_abort(struct tmio_mmc_host *host)
205 {
206 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
207
208 uniphier_sd_dma_endisable(host, 0);
209
210 if (priv->chan)
211 dmaengine_terminate_sync(priv->chan);
212 }
213
uniphier_sd_external_dma_dataend(struct tmio_mmc_host * host)214 static void uniphier_sd_external_dma_dataend(struct tmio_mmc_host *host)
215 {
216 uniphier_sd_dma_endisable(host, 0);
217
218 tmio_mmc_do_data_irq(host);
219 }
220
221 static const struct tmio_mmc_dma_ops uniphier_sd_external_dma_ops = {
222 .start = uniphier_sd_external_dma_start,
223 .enable = uniphier_sd_external_dma_enable,
224 .request = uniphier_sd_external_dma_request,
225 .release = uniphier_sd_external_dma_release,
226 .abort = uniphier_sd_external_dma_abort,
227 .dataend = uniphier_sd_external_dma_dataend,
228 };
229
uniphier_sd_internal_dma_issue(struct tasklet_struct * t)230 static void uniphier_sd_internal_dma_issue(struct tasklet_struct *t)
231 {
232 struct tmio_mmc_host *host = from_tasklet(host, t, dma_issue);
233 unsigned long flags;
234
235 spin_lock_irqsave(&host->lock, flags);
236 tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
237 spin_unlock_irqrestore(&host->lock, flags);
238
239 uniphier_sd_dma_endisable(host, 1);
240 writel(UNIPHIER_SD_DMA_CTL_START, host->ctl + UNIPHIER_SD_DMA_CTL);
241 }
242
uniphier_sd_internal_dma_start(struct tmio_mmc_host * host,struct mmc_data * data)243 static void uniphier_sd_internal_dma_start(struct tmio_mmc_host *host,
244 struct mmc_data *data)
245 {
246 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
247 struct scatterlist *sg = host->sg_ptr;
248 dma_addr_t dma_addr;
249 unsigned int dma_mode_dir;
250 u32 dma_mode;
251 int sg_len;
252
253 if ((data->flags & MMC_DATA_READ) && !host->chan_rx)
254 goto force_pio;
255
256 if (WARN_ON(host->sg_len != 1))
257 goto force_pio;
258
259 if (!IS_ALIGNED(sg->offset, 8))
260 goto force_pio;
261
262 if (data->flags & MMC_DATA_READ) {
263 priv->dma_dir = DMA_FROM_DEVICE;
264 dma_mode_dir = UNIPHIER_SD_DMA_MODE_DIR_FROM_DEV;
265 } else {
266 priv->dma_dir = DMA_TO_DEVICE;
267 dma_mode_dir = UNIPHIER_SD_DMA_MODE_DIR_TO_DEV;
268 }
269
270 sg_len = dma_map_sg(mmc_dev(host->mmc), sg, 1, priv->dma_dir);
271 if (sg_len == 0)
272 goto force_pio;
273
274 dma_mode = FIELD_PREP(UNIPHIER_SD_DMA_MODE_DIR_MASK, dma_mode_dir);
275 dma_mode |= FIELD_PREP(UNIPHIER_SD_DMA_MODE_WIDTH_MASK,
276 UNIPHIER_SD_DMA_MODE_WIDTH_64);
277 dma_mode |= UNIPHIER_SD_DMA_MODE_ADDR_INC;
278
279 writel(dma_mode, host->ctl + UNIPHIER_SD_DMA_MODE);
280
281 dma_addr = sg_dma_address(data->sg);
282 writel(lower_32_bits(dma_addr), host->ctl + UNIPHIER_SD_DMA_ADDR_L);
283 writel(upper_32_bits(dma_addr), host->ctl + UNIPHIER_SD_DMA_ADDR_H);
284
285 host->dma_on = true;
286
287 return;
288 force_pio:
289 uniphier_sd_dma_endisable(host, 0);
290 }
291
uniphier_sd_internal_dma_enable(struct tmio_mmc_host * host,bool enable)292 static void uniphier_sd_internal_dma_enable(struct tmio_mmc_host *host,
293 bool enable)
294 {
295 }
296
uniphier_sd_internal_dma_request(struct tmio_mmc_host * host,struct tmio_mmc_data * pdata)297 static void uniphier_sd_internal_dma_request(struct tmio_mmc_host *host,
298 struct tmio_mmc_data *pdata)
299 {
300 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
301
302 /*
303 * Due to a hardware bug, Pro5 cannot use DMA for RX.
304 * We can still use DMA for TX, but PIO for RX.
305 */
306 if (!(priv->caps & UNIPHIER_SD_CAP_BROKEN_DMA_RX))
307 host->chan_rx = (void *)0xdeadbeaf;
308
309 host->chan_tx = (void *)0xdeadbeaf;
310
311 tasklet_setup(&host->dma_issue, uniphier_sd_internal_dma_issue);
312 }
313
uniphier_sd_internal_dma_release(struct tmio_mmc_host * host)314 static void uniphier_sd_internal_dma_release(struct tmio_mmc_host *host)
315 {
316 /* Each value is set to zero to assume "disabling" each DMA */
317 host->chan_rx = NULL;
318 host->chan_tx = NULL;
319 }
320
uniphier_sd_internal_dma_abort(struct tmio_mmc_host * host)321 static void uniphier_sd_internal_dma_abort(struct tmio_mmc_host *host)
322 {
323 u32 tmp;
324
325 uniphier_sd_dma_endisable(host, 0);
326
327 tmp = readl(host->ctl + UNIPHIER_SD_DMA_RST);
328 tmp &= ~(UNIPHIER_SD_DMA_RST_CH1 | UNIPHIER_SD_DMA_RST_CH0);
329 writel(tmp, host->ctl + UNIPHIER_SD_DMA_RST);
330
331 tmp |= UNIPHIER_SD_DMA_RST_CH1 | UNIPHIER_SD_DMA_RST_CH0;
332 writel(tmp, host->ctl + UNIPHIER_SD_DMA_RST);
333 }
334
uniphier_sd_internal_dma_dataend(struct tmio_mmc_host * host)335 static void uniphier_sd_internal_dma_dataend(struct tmio_mmc_host *host)
336 {
337 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
338
339 uniphier_sd_dma_endisable(host, 0);
340 dma_unmap_sg(mmc_dev(host->mmc), host->sg_ptr, 1, priv->dma_dir);
341
342 tmio_mmc_do_data_irq(host);
343 }
344
345 static const struct tmio_mmc_dma_ops uniphier_sd_internal_dma_ops = {
346 .start = uniphier_sd_internal_dma_start,
347 .enable = uniphier_sd_internal_dma_enable,
348 .request = uniphier_sd_internal_dma_request,
349 .release = uniphier_sd_internal_dma_release,
350 .abort = uniphier_sd_internal_dma_abort,
351 .dataend = uniphier_sd_internal_dma_dataend,
352 };
353
uniphier_sd_clk_enable(struct tmio_mmc_host * host)354 static int uniphier_sd_clk_enable(struct tmio_mmc_host *host)
355 {
356 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
357 struct mmc_host *mmc = host->mmc;
358 int ret;
359
360 ret = clk_prepare_enable(priv->clk);
361 if (ret)
362 return ret;
363
364 ret = clk_set_rate(priv->clk, ULONG_MAX);
365 if (ret)
366 goto disable_clk;
367
368 priv->clk_rate = clk_get_rate(priv->clk);
369
370 /* If max-frequency property is set, use it. */
371 if (!mmc->f_max)
372 mmc->f_max = priv->clk_rate;
373
374 /*
375 * 1/512 is the finest divisor in the original IP. Newer versions
376 * also supports 1/1024 divisor. (UniPhier-specific extension)
377 */
378 if (priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP)
379 mmc->f_min = priv->clk_rate / 1024;
380 else
381 mmc->f_min = priv->clk_rate / 512;
382
383 ret = reset_control_deassert(priv->rst);
384 if (ret)
385 goto disable_clk;
386
387 ret = reset_control_deassert(priv->rst_br);
388 if (ret)
389 goto assert_rst;
390
391 return 0;
392
393 assert_rst:
394 reset_control_assert(priv->rst);
395 disable_clk:
396 clk_disable_unprepare(priv->clk);
397
398 return ret;
399 }
400
uniphier_sd_clk_disable(struct tmio_mmc_host * host)401 static void uniphier_sd_clk_disable(struct tmio_mmc_host *host)
402 {
403 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
404
405 reset_control_assert(priv->rst_br);
406 reset_control_assert(priv->rst);
407 clk_disable_unprepare(priv->clk);
408 }
409
uniphier_sd_hw_reset(struct mmc_host * mmc)410 static void uniphier_sd_hw_reset(struct mmc_host *mmc)
411 {
412 struct tmio_mmc_host *host = mmc_priv(mmc);
413 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
414
415 reset_control_assert(priv->rst_hw);
416 /* For eMMC, minimum is 1us but give it 9us for good measure */
417 udelay(9);
418 reset_control_deassert(priv->rst_hw);
419 /* For eMMC, minimum is 200us but give it 300us for good measure */
420 usleep_range(300, 1000);
421 }
422
uniphier_sd_set_clock(struct tmio_mmc_host * host,unsigned int clock)423 static void uniphier_sd_set_clock(struct tmio_mmc_host *host,
424 unsigned int clock)
425 {
426 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
427 unsigned long divisor;
428 u32 tmp;
429
430 tmp = readl(host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
431
432 /* stop the clock before changing its rate to avoid a glitch signal */
433 tmp &= ~CLK_CTL_SCLKEN;
434 writel(tmp, host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
435
436 if (clock == 0)
437 return;
438
439 tmp &= ~UNIPHIER_SD_CLK_CTL_DIV1024;
440 tmp &= ~UNIPHIER_SD_CLK_CTL_DIV1;
441 tmp &= ~CLK_CTL_DIV_MASK;
442
443 divisor = priv->clk_rate / clock;
444
445 /*
446 * In the original IP, bit[7:0] represents the divisor.
447 * bit7 set: 1/512, ... bit0 set:1/4, all bits clear: 1/2
448 *
449 * The IP does not define a way to achieve 1/1. For UniPhier variants,
450 * bit10 is used for 1/1. Newer versions of UniPhier variants use
451 * bit16 for 1/1024.
452 */
453 if (divisor <= 1)
454 tmp |= UNIPHIER_SD_CLK_CTL_DIV1;
455 else if (priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP && divisor > 512)
456 tmp |= UNIPHIER_SD_CLK_CTL_DIV1024;
457 else
458 tmp |= roundup_pow_of_two(divisor) >> 2;
459
460 writel(tmp, host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
461
462 tmp |= CLK_CTL_SCLKEN;
463 writel(tmp, host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
464 }
465
uniphier_sd_host_init(struct tmio_mmc_host * host)466 static void uniphier_sd_host_init(struct tmio_mmc_host *host)
467 {
468 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
469 u32 val;
470
471 /*
472 * Connected to 32bit AXI.
473 * This register holds settings for SoC-specific internal bus
474 * connection. What is worse, the register spec was changed,
475 * breaking the backward compatibility. Write an appropriate
476 * value depending on a flag associated with a compatible string.
477 */
478 if (priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP)
479 val = 0x00000101;
480 else
481 val = 0x00000000;
482
483 writel(val, host->ctl + UNIPHIER_SD_HOST_MODE);
484
485 val = 0;
486 /*
487 * If supported, the controller can automatically
488 * enable/disable the clock line to the card.
489 */
490 if (priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP)
491 val |= UNIPHIER_SD_CLKCTL_OFFEN;
492
493 writel(val, host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
494 }
495
uniphier_sd_start_signal_voltage_switch(struct mmc_host * mmc,struct mmc_ios * ios)496 static int uniphier_sd_start_signal_voltage_switch(struct mmc_host *mmc,
497 struct mmc_ios *ios)
498 {
499 struct tmio_mmc_host *host = mmc_priv(mmc);
500 struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
501 struct pinctrl_state *pinstate = NULL;
502 u32 val, tmp;
503
504 switch (ios->signal_voltage) {
505 case MMC_SIGNAL_VOLTAGE_330:
506 val = UNIPHIER_SD_VOLT_330;
507 break;
508 case MMC_SIGNAL_VOLTAGE_180:
509 val = UNIPHIER_SD_VOLT_180;
510 pinstate = priv->pinstate_uhs;
511 break;
512 default:
513 return -ENOTSUPP;
514 }
515
516 tmp = readl(host->ctl + UNIPHIER_SD_VOLT);
517 tmp &= ~UNIPHIER_SD_VOLT_MASK;
518 tmp |= FIELD_PREP(UNIPHIER_SD_VOLT_MASK, val);
519 writel(tmp, host->ctl + UNIPHIER_SD_VOLT);
520
521 if (pinstate)
522 pinctrl_select_state(priv->pinctrl, pinstate);
523 else
524 pinctrl_select_default_state(mmc_dev(mmc));
525
526 return 0;
527 }
528
uniphier_sd_uhs_init(struct tmio_mmc_host * host,struct uniphier_sd_priv * priv)529 static int uniphier_sd_uhs_init(struct tmio_mmc_host *host,
530 struct uniphier_sd_priv *priv)
531 {
532 priv->pinctrl = devm_pinctrl_get(mmc_dev(host->mmc));
533 if (IS_ERR(priv->pinctrl))
534 return PTR_ERR(priv->pinctrl);
535
536 priv->pinstate_uhs = pinctrl_lookup_state(priv->pinctrl, "uhs");
537 if (IS_ERR(priv->pinstate_uhs))
538 return PTR_ERR(priv->pinstate_uhs);
539
540 host->ops.start_signal_voltage_switch =
541 uniphier_sd_start_signal_voltage_switch;
542
543 return 0;
544 }
545
uniphier_sd_probe(struct platform_device * pdev)546 static int uniphier_sd_probe(struct platform_device *pdev)
547 {
548 struct device *dev = &pdev->dev;
549 struct uniphier_sd_priv *priv;
550 struct tmio_mmc_data *tmio_data;
551 struct tmio_mmc_host *host;
552 int irq, ret;
553
554 irq = platform_get_irq(pdev, 0);
555 if (irq < 0)
556 return irq;
557
558 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
559 if (!priv)
560 return -ENOMEM;
561
562 priv->caps = (unsigned long)of_device_get_match_data(dev);
563
564 priv->clk = devm_clk_get(dev, NULL);
565 if (IS_ERR(priv->clk)) {
566 dev_err(dev, "failed to get clock\n");
567 return PTR_ERR(priv->clk);
568 }
569
570 priv->rst = devm_reset_control_get_shared(dev, "host");
571 if (IS_ERR(priv->rst)) {
572 dev_err(dev, "failed to get host reset\n");
573 return PTR_ERR(priv->rst);
574 }
575
576 /* old version has one more reset */
577 if (!(priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP)) {
578 priv->rst_br = devm_reset_control_get_shared(dev, "bridge");
579 if (IS_ERR(priv->rst_br)) {
580 dev_err(dev, "failed to get bridge reset\n");
581 return PTR_ERR(priv->rst_br);
582 }
583 }
584
585 tmio_data = &priv->tmio_data;
586 tmio_data->flags |= TMIO_MMC_32BIT_DATA_PORT;
587 tmio_data->flags |= TMIO_MMC_USE_BUSY_TIMEOUT;
588
589 host = tmio_mmc_host_alloc(pdev, tmio_data);
590 if (IS_ERR(host))
591 return PTR_ERR(host);
592
593 if (host->mmc->caps & MMC_CAP_HW_RESET) {
594 priv->rst_hw = devm_reset_control_get_exclusive(dev, "hw");
595 if (IS_ERR(priv->rst_hw)) {
596 dev_err(dev, "failed to get hw reset\n");
597 ret = PTR_ERR(priv->rst_hw);
598 goto free_host;
599 }
600 host->ops.hw_reset = uniphier_sd_hw_reset;
601 }
602
603 if (host->mmc->caps & MMC_CAP_UHS) {
604 ret = uniphier_sd_uhs_init(host, priv);
605 if (ret) {
606 dev_warn(dev,
607 "failed to setup UHS (error %d). Disabling UHS.",
608 ret);
609 host->mmc->caps &= ~MMC_CAP_UHS;
610 }
611 }
612
613 if (priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP)
614 host->dma_ops = &uniphier_sd_internal_dma_ops;
615 else
616 host->dma_ops = &uniphier_sd_external_dma_ops;
617
618 host->bus_shift = 1;
619 host->clk_enable = uniphier_sd_clk_enable;
620 host->clk_disable = uniphier_sd_clk_disable;
621 host->set_clock = uniphier_sd_set_clock;
622
623 ret = uniphier_sd_clk_enable(host);
624 if (ret)
625 goto free_host;
626
627 uniphier_sd_host_init(host);
628
629 tmio_data->ocr_mask = MMC_VDD_32_33 | MMC_VDD_33_34;
630 if (host->mmc->caps & MMC_CAP_UHS)
631 tmio_data->ocr_mask |= MMC_VDD_165_195;
632
633 tmio_data->max_segs = 1;
634 tmio_data->max_blk_count = U16_MAX;
635
636 ret = tmio_mmc_host_probe(host);
637 if (ret)
638 goto disable_clk;
639
640 ret = devm_request_irq(dev, irq, tmio_mmc_irq, IRQF_SHARED,
641 dev_name(dev), host);
642 if (ret)
643 goto remove_host;
644
645 return 0;
646
647 remove_host:
648 tmio_mmc_host_remove(host);
649 disable_clk:
650 uniphier_sd_clk_disable(host);
651 free_host:
652 tmio_mmc_host_free(host);
653
654 return ret;
655 }
656
uniphier_sd_remove(struct platform_device * pdev)657 static int uniphier_sd_remove(struct platform_device *pdev)
658 {
659 struct tmio_mmc_host *host = platform_get_drvdata(pdev);
660
661 tmio_mmc_host_remove(host);
662 uniphier_sd_clk_disable(host);
663 tmio_mmc_host_free(host);
664
665 return 0;
666 }
667
668 static const struct of_device_id uniphier_sd_match[] = {
669 {
670 .compatible = "socionext,uniphier-sd-v2.91",
671 },
672 {
673 .compatible = "socionext,uniphier-sd-v3.1",
674 .data = (void *)(UNIPHIER_SD_CAP_EXTENDED_IP |
675 UNIPHIER_SD_CAP_BROKEN_DMA_RX),
676 },
677 {
678 .compatible = "socionext,uniphier-sd-v3.1.1",
679 .data = (void *)UNIPHIER_SD_CAP_EXTENDED_IP,
680 },
681 { /* sentinel */ }
682 };
683 MODULE_DEVICE_TABLE(of, uniphier_sd_match);
684
685 static struct platform_driver uniphier_sd_driver = {
686 .probe = uniphier_sd_probe,
687 .remove = uniphier_sd_remove,
688 .driver = {
689 .name = "uniphier-sd",
690 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
691 .of_match_table = uniphier_sd_match,
692 },
693 };
694 module_platform_driver(uniphier_sd_driver);
695
696 MODULE_AUTHOR("Masahiro Yamada <yamada.masahiro@socionext.com>");
697 MODULE_DESCRIPTION("UniPhier SD/eMMC host controller driver");
698 MODULE_LICENSE("GPL v2");
699