1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Actions Semi Owl SoCs SD/MMC driver
4 *
5 * Copyright (c) 2014 Actions Semi Inc.
6 * Copyright (c) 2019 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
7 *
8 * TODO: SDIO support
9 */
10
11 #include <linux/clk.h>
12 #include <linux/delay.h>
13 #include <linux/dmaengine.h>
14 #include <linux/dma-direction.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/interrupt.h>
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/slot-gpio.h>
19 #include <linux/module.h>
20 #include <linux/of_platform.h>
21 #include <linux/reset.h>
22 #include <linux/spinlock.h>
23
24 /*
25 * SDC registers
26 */
27 #define OWL_REG_SD_EN 0x0000
28 #define OWL_REG_SD_CTL 0x0004
29 #define OWL_REG_SD_STATE 0x0008
30 #define OWL_REG_SD_CMD 0x000c
31 #define OWL_REG_SD_ARG 0x0010
32 #define OWL_REG_SD_RSPBUF0 0x0014
33 #define OWL_REG_SD_RSPBUF1 0x0018
34 #define OWL_REG_SD_RSPBUF2 0x001c
35 #define OWL_REG_SD_RSPBUF3 0x0020
36 #define OWL_REG_SD_RSPBUF4 0x0024
37 #define OWL_REG_SD_DAT 0x0028
38 #define OWL_REG_SD_BLK_SIZE 0x002c
39 #define OWL_REG_SD_BLK_NUM 0x0030
40 #define OWL_REG_SD_BUF_SIZE 0x0034
41
42 /* SD_EN Bits */
43 #define OWL_SD_EN_RANE BIT(31)
44 #define OWL_SD_EN_RAN_SEED(x) (((x) & 0x3f) << 24)
45 #define OWL_SD_EN_S18EN BIT(12)
46 #define OWL_SD_EN_RESE BIT(10)
47 #define OWL_SD_EN_DAT1_S BIT(9)
48 #define OWL_SD_EN_CLK_S BIT(8)
49 #define OWL_SD_ENABLE BIT(7)
50 #define OWL_SD_EN_BSEL BIT(6)
51 #define OWL_SD_EN_SDIOEN BIT(3)
52 #define OWL_SD_EN_DDREN BIT(2)
53 #define OWL_SD_EN_DATAWID(x) (((x) & 0x3) << 0)
54
55 /* SD_CTL Bits */
56 #define OWL_SD_CTL_TOUTEN BIT(31)
57 #define OWL_SD_CTL_TOUTCNT(x) (((x) & 0x7f) << 24)
58 #define OWL_SD_CTL_DELAY_MSK GENMASK(23, 16)
59 #define OWL_SD_CTL_RDELAY(x) (((x) & 0xf) << 20)
60 #define OWL_SD_CTL_WDELAY(x) (((x) & 0xf) << 16)
61 #define OWL_SD_CTL_CMDLEN BIT(13)
62 #define OWL_SD_CTL_SCC BIT(12)
63 #define OWL_SD_CTL_TCN(x) (((x) & 0xf) << 8)
64 #define OWL_SD_CTL_TS BIT(7)
65 #define OWL_SD_CTL_LBE BIT(6)
66 #define OWL_SD_CTL_C7EN BIT(5)
67 #define OWL_SD_CTL_TM(x) (((x) & 0xf) << 0)
68
69 #define OWL_SD_DELAY_LOW_CLK 0x0f
70 #define OWL_SD_DELAY_MID_CLK 0x0a
71 #define OWL_SD_DELAY_HIGH_CLK 0x09
72 #define OWL_SD_RDELAY_DDR50 0x0a
73 #define OWL_SD_WDELAY_DDR50 0x08
74
75 /* SD_STATE Bits */
76 #define OWL_SD_STATE_DAT1BS BIT(18)
77 #define OWL_SD_STATE_SDIOB_P BIT(17)
78 #define OWL_SD_STATE_SDIOB_EN BIT(16)
79 #define OWL_SD_STATE_TOUTE BIT(15)
80 #define OWL_SD_STATE_BAEP BIT(14)
81 #define OWL_SD_STATE_MEMRDY BIT(12)
82 #define OWL_SD_STATE_CMDS BIT(11)
83 #define OWL_SD_STATE_DAT1AS BIT(10)
84 #define OWL_SD_STATE_SDIOA_P BIT(9)
85 #define OWL_SD_STATE_SDIOA_EN BIT(8)
86 #define OWL_SD_STATE_DAT0S BIT(7)
87 #define OWL_SD_STATE_TEIE BIT(6)
88 #define OWL_SD_STATE_TEI BIT(5)
89 #define OWL_SD_STATE_CLNR BIT(4)
90 #define OWL_SD_STATE_CLC BIT(3)
91 #define OWL_SD_STATE_WC16ER BIT(2)
92 #define OWL_SD_STATE_RC16ER BIT(1)
93 #define OWL_SD_STATE_CRC7ER BIT(0)
94
95 #define OWL_CMD_TIMEOUT_MS 30000
96
97 struct owl_mmc_host {
98 struct device *dev;
99 struct reset_control *reset;
100 void __iomem *base;
101 struct clk *clk;
102 struct completion sdc_complete;
103 spinlock_t lock;
104 int irq;
105 u32 clock;
106 bool ddr_50;
107
108 enum dma_data_direction dma_dir;
109 struct dma_chan *dma;
110 struct dma_async_tx_descriptor *desc;
111 struct dma_slave_config dma_cfg;
112 struct completion dma_complete;
113
114 struct mmc_host *mmc;
115 struct mmc_request *mrq;
116 struct mmc_command *cmd;
117 struct mmc_data *data;
118 };
119
owl_mmc_update_reg(void __iomem * reg,unsigned int val,bool state)120 static void owl_mmc_update_reg(void __iomem *reg, unsigned int val, bool state)
121 {
122 unsigned int regval;
123
124 regval = readl(reg);
125
126 if (state)
127 regval |= val;
128 else
129 regval &= ~val;
130
131 writel(regval, reg);
132 }
133
owl_irq_handler(int irq,void * devid)134 static irqreturn_t owl_irq_handler(int irq, void *devid)
135 {
136 struct owl_mmc_host *owl_host = devid;
137 u32 state;
138
139 spin_lock(&owl_host->lock);
140
141 state = readl(owl_host->base + OWL_REG_SD_STATE);
142 if (state & OWL_SD_STATE_TEI) {
143 state = readl(owl_host->base + OWL_REG_SD_STATE);
144 state |= OWL_SD_STATE_TEI;
145 writel(state, owl_host->base + OWL_REG_SD_STATE);
146 complete(&owl_host->sdc_complete);
147 }
148
149 spin_unlock(&owl_host->lock);
150
151 return IRQ_HANDLED;
152 }
153
owl_mmc_finish_request(struct owl_mmc_host * owl_host)154 static void owl_mmc_finish_request(struct owl_mmc_host *owl_host)
155 {
156 struct mmc_request *mrq = owl_host->mrq;
157 struct mmc_data *data = mrq->data;
158
159 /* Should never be NULL */
160 WARN_ON(!mrq);
161
162 owl_host->mrq = NULL;
163
164 if (data)
165 dma_unmap_sg(owl_host->dma->device->dev, data->sg, data->sg_len,
166 owl_host->dma_dir);
167
168 /* Finally finish request */
169 mmc_request_done(owl_host->mmc, mrq);
170 }
171
owl_mmc_send_cmd(struct owl_mmc_host * owl_host,struct mmc_command * cmd,struct mmc_data * data)172 static void owl_mmc_send_cmd(struct owl_mmc_host *owl_host,
173 struct mmc_command *cmd,
174 struct mmc_data *data)
175 {
176 unsigned long timeout;
177 u32 mode, state, resp[2];
178 u32 cmd_rsp_mask = 0;
179
180 init_completion(&owl_host->sdc_complete);
181
182 switch (mmc_resp_type(cmd)) {
183 case MMC_RSP_NONE:
184 mode = OWL_SD_CTL_TM(0);
185 break;
186
187 case MMC_RSP_R1:
188 if (data) {
189 if (data->flags & MMC_DATA_READ)
190 mode = OWL_SD_CTL_TM(4);
191 else
192 mode = OWL_SD_CTL_TM(5);
193 } else {
194 mode = OWL_SD_CTL_TM(1);
195 }
196 cmd_rsp_mask = OWL_SD_STATE_CLNR | OWL_SD_STATE_CRC7ER;
197
198 break;
199
200 case MMC_RSP_R1B:
201 mode = OWL_SD_CTL_TM(3);
202 cmd_rsp_mask = OWL_SD_STATE_CLNR | OWL_SD_STATE_CRC7ER;
203 break;
204
205 case MMC_RSP_R2:
206 mode = OWL_SD_CTL_TM(2);
207 cmd_rsp_mask = OWL_SD_STATE_CLNR | OWL_SD_STATE_CRC7ER;
208 break;
209
210 case MMC_RSP_R3:
211 mode = OWL_SD_CTL_TM(1);
212 cmd_rsp_mask = OWL_SD_STATE_CLNR;
213 break;
214
215 default:
216 dev_warn(owl_host->dev, "Unknown MMC command\n");
217 cmd->error = -EINVAL;
218 return;
219 }
220
221 /* Keep current WDELAY and RDELAY */
222 mode |= (readl(owl_host->base + OWL_REG_SD_CTL) & (0xff << 16));
223
224 /* Start to send corresponding command type */
225 writel(cmd->arg, owl_host->base + OWL_REG_SD_ARG);
226 writel(cmd->opcode, owl_host->base + OWL_REG_SD_CMD);
227
228 /* Set LBE to send clk at the end of last read block */
229 if (data) {
230 mode |= (OWL_SD_CTL_TS | OWL_SD_CTL_LBE | 0x64000000);
231 } else {
232 mode &= ~(OWL_SD_CTL_TOUTEN | OWL_SD_CTL_LBE);
233 mode |= OWL_SD_CTL_TS;
234 }
235
236 owl_host->cmd = cmd;
237
238 /* Start transfer */
239 writel(mode, owl_host->base + OWL_REG_SD_CTL);
240
241 if (data)
242 return;
243
244 timeout = msecs_to_jiffies(cmd->busy_timeout ? cmd->busy_timeout :
245 OWL_CMD_TIMEOUT_MS);
246
247 if (!wait_for_completion_timeout(&owl_host->sdc_complete, timeout)) {
248 dev_err(owl_host->dev, "CMD interrupt timeout\n");
249 cmd->error = -ETIMEDOUT;
250 return;
251 }
252
253 state = readl(owl_host->base + OWL_REG_SD_STATE);
254 if (mmc_resp_type(cmd) & MMC_RSP_PRESENT) {
255 if (cmd_rsp_mask & state) {
256 if (state & OWL_SD_STATE_CLNR) {
257 dev_err(owl_host->dev, "Error CMD_NO_RSP\n");
258 cmd->error = -EILSEQ;
259 return;
260 }
261
262 if (state & OWL_SD_STATE_CRC7ER) {
263 dev_err(owl_host->dev, "Error CMD_RSP_CRC\n");
264 cmd->error = -EILSEQ;
265 return;
266 }
267 }
268
269 if (mmc_resp_type(cmd) & MMC_RSP_136) {
270 cmd->resp[3] = readl(owl_host->base + OWL_REG_SD_RSPBUF0);
271 cmd->resp[2] = readl(owl_host->base + OWL_REG_SD_RSPBUF1);
272 cmd->resp[1] = readl(owl_host->base + OWL_REG_SD_RSPBUF2);
273 cmd->resp[0] = readl(owl_host->base + OWL_REG_SD_RSPBUF3);
274 } else {
275 resp[0] = readl(owl_host->base + OWL_REG_SD_RSPBUF0);
276 resp[1] = readl(owl_host->base + OWL_REG_SD_RSPBUF1);
277 cmd->resp[0] = resp[1] << 24 | resp[0] >> 8;
278 cmd->resp[1] = resp[1] >> 8;
279 }
280 }
281 }
282
owl_mmc_dma_complete(void * param)283 static void owl_mmc_dma_complete(void *param)
284 {
285 struct owl_mmc_host *owl_host = param;
286 struct mmc_data *data = owl_host->data;
287
288 if (data)
289 complete(&owl_host->dma_complete);
290 }
291
owl_mmc_prepare_data(struct owl_mmc_host * owl_host,struct mmc_data * data)292 static int owl_mmc_prepare_data(struct owl_mmc_host *owl_host,
293 struct mmc_data *data)
294 {
295 u32 total;
296
297 owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN, OWL_SD_EN_BSEL,
298 true);
299 writel(data->blocks, owl_host->base + OWL_REG_SD_BLK_NUM);
300 writel(data->blksz, owl_host->base + OWL_REG_SD_BLK_SIZE);
301 total = data->blksz * data->blocks;
302
303 if (total < 512)
304 writel(total, owl_host->base + OWL_REG_SD_BUF_SIZE);
305 else
306 writel(512, owl_host->base + OWL_REG_SD_BUF_SIZE);
307
308 if (data->flags & MMC_DATA_WRITE) {
309 owl_host->dma_dir = DMA_TO_DEVICE;
310 owl_host->dma_cfg.direction = DMA_MEM_TO_DEV;
311 } else {
312 owl_host->dma_dir = DMA_FROM_DEVICE;
313 owl_host->dma_cfg.direction = DMA_DEV_TO_MEM;
314 }
315
316 dma_map_sg(owl_host->dma->device->dev, data->sg,
317 data->sg_len, owl_host->dma_dir);
318
319 dmaengine_slave_config(owl_host->dma, &owl_host->dma_cfg);
320 owl_host->desc = dmaengine_prep_slave_sg(owl_host->dma, data->sg,
321 data->sg_len,
322 owl_host->dma_cfg.direction,
323 DMA_PREP_INTERRUPT |
324 DMA_CTRL_ACK);
325 if (!owl_host->desc) {
326 dev_err(owl_host->dev, "Can't prepare slave sg\n");
327 return -EBUSY;
328 }
329
330 owl_host->data = data;
331
332 owl_host->desc->callback = owl_mmc_dma_complete;
333 owl_host->desc->callback_param = (void *)owl_host;
334 data->error = 0;
335
336 return 0;
337 }
338
owl_mmc_request(struct mmc_host * mmc,struct mmc_request * mrq)339 static void owl_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
340 {
341 struct owl_mmc_host *owl_host = mmc_priv(mmc);
342 struct mmc_data *data = mrq->data;
343 int ret;
344
345 owl_host->mrq = mrq;
346 if (mrq->data) {
347 ret = owl_mmc_prepare_data(owl_host, data);
348 if (ret < 0) {
349 data->error = ret;
350 goto err_out;
351 }
352
353 init_completion(&owl_host->dma_complete);
354 dmaengine_submit(owl_host->desc);
355 dma_async_issue_pending(owl_host->dma);
356 }
357
358 owl_mmc_send_cmd(owl_host, mrq->cmd, data);
359
360 if (data) {
361 if (!wait_for_completion_timeout(&owl_host->sdc_complete,
362 10 * HZ)) {
363 dev_err(owl_host->dev, "CMD interrupt timeout\n");
364 mrq->cmd->error = -ETIMEDOUT;
365 dmaengine_terminate_all(owl_host->dma);
366 goto err_out;
367 }
368
369 if (!wait_for_completion_timeout(&owl_host->dma_complete,
370 5 * HZ)) {
371 dev_err(owl_host->dev, "DMA interrupt timeout\n");
372 mrq->cmd->error = -ETIMEDOUT;
373 dmaengine_terminate_all(owl_host->dma);
374 goto err_out;
375 }
376
377 if (data->stop)
378 owl_mmc_send_cmd(owl_host, data->stop, NULL);
379
380 data->bytes_xfered = data->blocks * data->blksz;
381 }
382
383 err_out:
384 owl_mmc_finish_request(owl_host);
385 }
386
owl_mmc_set_clk_rate(struct owl_mmc_host * owl_host,unsigned int rate)387 static int owl_mmc_set_clk_rate(struct owl_mmc_host *owl_host,
388 unsigned int rate)
389 {
390 unsigned long clk_rate;
391 int ret;
392 u32 reg;
393
394 reg = readl(owl_host->base + OWL_REG_SD_CTL);
395 reg &= ~OWL_SD_CTL_DELAY_MSK;
396
397 /* Set RDELAY and WDELAY based on the clock */
398 if (rate <= 1000000) {
399 writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_DELAY_LOW_CLK) |
400 OWL_SD_CTL_WDELAY(OWL_SD_DELAY_LOW_CLK),
401 owl_host->base + OWL_REG_SD_CTL);
402 } else if ((rate > 1000000) && (rate <= 26000000)) {
403 writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_DELAY_MID_CLK) |
404 OWL_SD_CTL_WDELAY(OWL_SD_DELAY_MID_CLK),
405 owl_host->base + OWL_REG_SD_CTL);
406 } else if ((rate > 26000000) && (rate <= 52000000) && !owl_host->ddr_50) {
407 writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_DELAY_HIGH_CLK) |
408 OWL_SD_CTL_WDELAY(OWL_SD_DELAY_HIGH_CLK),
409 owl_host->base + OWL_REG_SD_CTL);
410 /* DDR50 mode has special delay chain */
411 } else if ((rate > 26000000) && (rate <= 52000000) && owl_host->ddr_50) {
412 writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_RDELAY_DDR50) |
413 OWL_SD_CTL_WDELAY(OWL_SD_WDELAY_DDR50),
414 owl_host->base + OWL_REG_SD_CTL);
415 } else {
416 dev_err(owl_host->dev, "SD clock rate not supported\n");
417 return -EINVAL;
418 }
419
420 clk_rate = clk_round_rate(owl_host->clk, rate << 1);
421 ret = clk_set_rate(owl_host->clk, clk_rate);
422
423 return ret;
424 }
425
owl_mmc_set_clk(struct owl_mmc_host * owl_host,struct mmc_ios * ios)426 static void owl_mmc_set_clk(struct owl_mmc_host *owl_host, struct mmc_ios *ios)
427 {
428 if (!ios->clock)
429 return;
430
431 owl_host->clock = ios->clock;
432 owl_mmc_set_clk_rate(owl_host, ios->clock);
433 }
434
owl_mmc_set_bus_width(struct owl_mmc_host * owl_host,struct mmc_ios * ios)435 static void owl_mmc_set_bus_width(struct owl_mmc_host *owl_host,
436 struct mmc_ios *ios)
437 {
438 u32 reg;
439
440 reg = readl(owl_host->base + OWL_REG_SD_EN);
441 reg &= ~0x03;
442 switch (ios->bus_width) {
443 case MMC_BUS_WIDTH_1:
444 break;
445 case MMC_BUS_WIDTH_4:
446 reg |= OWL_SD_EN_DATAWID(1);
447 break;
448 case MMC_BUS_WIDTH_8:
449 reg |= OWL_SD_EN_DATAWID(2);
450 break;
451 }
452
453 writel(reg, owl_host->base + OWL_REG_SD_EN);
454 }
455
owl_mmc_ctr_reset(struct owl_mmc_host * owl_host)456 static void owl_mmc_ctr_reset(struct owl_mmc_host *owl_host)
457 {
458 reset_control_assert(owl_host->reset);
459 udelay(20);
460 reset_control_deassert(owl_host->reset);
461 }
462
owl_mmc_power_on(struct owl_mmc_host * owl_host)463 static void owl_mmc_power_on(struct owl_mmc_host *owl_host)
464 {
465 u32 mode;
466
467 init_completion(&owl_host->sdc_complete);
468
469 /* Enable transfer end IRQ */
470 owl_mmc_update_reg(owl_host->base + OWL_REG_SD_STATE,
471 OWL_SD_STATE_TEIE, true);
472
473 /* Send init clk */
474 mode = (readl(owl_host->base + OWL_REG_SD_CTL) & (0xff << 16));
475 mode |= OWL_SD_CTL_TS | OWL_SD_CTL_TCN(5) | OWL_SD_CTL_TM(8);
476 writel(mode, owl_host->base + OWL_REG_SD_CTL);
477
478 if (!wait_for_completion_timeout(&owl_host->sdc_complete, HZ)) {
479 dev_err(owl_host->dev, "CMD interrupt timeout\n");
480 return;
481 }
482 }
483
owl_mmc_set_ios(struct mmc_host * mmc,struct mmc_ios * ios)484 static void owl_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
485 {
486 struct owl_mmc_host *owl_host = mmc_priv(mmc);
487
488 switch (ios->power_mode) {
489 case MMC_POWER_UP:
490 dev_dbg(owl_host->dev, "Powering card up\n");
491
492 /* Reset the SDC controller to clear all previous states */
493 owl_mmc_ctr_reset(owl_host);
494 clk_prepare_enable(owl_host->clk);
495 writel(OWL_SD_ENABLE | OWL_SD_EN_RESE,
496 owl_host->base + OWL_REG_SD_EN);
497
498 break;
499
500 case MMC_POWER_ON:
501 dev_dbg(owl_host->dev, "Powering card on\n");
502 owl_mmc_power_on(owl_host);
503
504 break;
505
506 case MMC_POWER_OFF:
507 dev_dbg(owl_host->dev, "Powering card off\n");
508 clk_disable_unprepare(owl_host->clk);
509
510 return;
511
512 default:
513 dev_dbg(owl_host->dev, "Ignoring unknown card power state\n");
514 break;
515 }
516
517 if (ios->clock != owl_host->clock)
518 owl_mmc_set_clk(owl_host, ios);
519
520 owl_mmc_set_bus_width(owl_host, ios);
521
522 /* Enable DDR mode if requested */
523 if (ios->timing == MMC_TIMING_UHS_DDR50) {
524 owl_host->ddr_50 = true;
525 owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN,
526 OWL_SD_EN_DDREN, true);
527 } else {
528 owl_host->ddr_50 = false;
529 }
530 }
531
owl_mmc_start_signal_voltage_switch(struct mmc_host * mmc,struct mmc_ios * ios)532 static int owl_mmc_start_signal_voltage_switch(struct mmc_host *mmc,
533 struct mmc_ios *ios)
534 {
535 struct owl_mmc_host *owl_host = mmc_priv(mmc);
536
537 /* It is enough to change the pad ctrl bit for voltage switch */
538 switch (ios->signal_voltage) {
539 case MMC_SIGNAL_VOLTAGE_330:
540 owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN,
541 OWL_SD_EN_S18EN, false);
542 break;
543 case MMC_SIGNAL_VOLTAGE_180:
544 owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN,
545 OWL_SD_EN_S18EN, true);
546 break;
547 default:
548 return -ENOTSUPP;
549 }
550
551 return 0;
552 }
553
554 static const struct mmc_host_ops owl_mmc_ops = {
555 .request = owl_mmc_request,
556 .set_ios = owl_mmc_set_ios,
557 .get_ro = mmc_gpio_get_ro,
558 .get_cd = mmc_gpio_get_cd,
559 .start_signal_voltage_switch = owl_mmc_start_signal_voltage_switch,
560 };
561
owl_mmc_probe(struct platform_device * pdev)562 static int owl_mmc_probe(struct platform_device *pdev)
563 {
564 struct owl_mmc_host *owl_host;
565 struct mmc_host *mmc;
566 struct resource *res;
567 int ret;
568
569 mmc = mmc_alloc_host(sizeof(struct owl_mmc_host), &pdev->dev);
570 if (!mmc) {
571 dev_err(&pdev->dev, "mmc alloc host failed\n");
572 return -ENOMEM;
573 }
574 platform_set_drvdata(pdev, mmc);
575
576 owl_host = mmc_priv(mmc);
577 owl_host->dev = &pdev->dev;
578 owl_host->mmc = mmc;
579 spin_lock_init(&owl_host->lock);
580
581 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
582 owl_host->base = devm_ioremap_resource(&pdev->dev, res);
583 if (IS_ERR(owl_host->base)) {
584 ret = PTR_ERR(owl_host->base);
585 goto err_free_host;
586 }
587
588 owl_host->clk = devm_clk_get(&pdev->dev, NULL);
589 if (IS_ERR(owl_host->clk)) {
590 dev_err(&pdev->dev, "No clock defined\n");
591 ret = PTR_ERR(owl_host->clk);
592 goto err_free_host;
593 }
594
595 owl_host->reset = devm_reset_control_get_exclusive(&pdev->dev, NULL);
596 if (IS_ERR(owl_host->reset)) {
597 dev_err(&pdev->dev, "Could not get reset control\n");
598 ret = PTR_ERR(owl_host->reset);
599 goto err_free_host;
600 }
601
602 mmc->ops = &owl_mmc_ops;
603 mmc->max_blk_count = 512;
604 mmc->max_blk_size = 512;
605 mmc->max_segs = 256;
606 mmc->max_seg_size = 262144;
607 mmc->max_req_size = 262144;
608 /* 100kHz ~ 52MHz */
609 mmc->f_min = 100000;
610 mmc->f_max = 52000000;
611 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
612 MMC_CAP_4_BIT_DATA;
613 mmc->caps2 = (MMC_CAP2_BOOTPART_NOACC | MMC_CAP2_NO_SDIO);
614 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34 |
615 MMC_VDD_165_195;
616
617 ret = mmc_of_parse(mmc);
618 if (ret)
619 goto err_free_host;
620
621 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
622 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
623 owl_host->dma = dma_request_chan(&pdev->dev, "mmc");
624 if (IS_ERR(owl_host->dma)) {
625 dev_err(owl_host->dev, "Failed to get external DMA channel.\n");
626 ret = PTR_ERR(owl_host->dma);
627 goto err_free_host;
628 }
629
630 dev_info(&pdev->dev, "Using %s for DMA transfers\n",
631 dma_chan_name(owl_host->dma));
632
633 owl_host->dma_cfg.src_addr = res->start + OWL_REG_SD_DAT;
634 owl_host->dma_cfg.dst_addr = res->start + OWL_REG_SD_DAT;
635 owl_host->dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
636 owl_host->dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
637 owl_host->dma_cfg.device_fc = false;
638
639 owl_host->irq = platform_get_irq(pdev, 0);
640 if (owl_host->irq < 0) {
641 ret = -EINVAL;
642 goto err_release_channel;
643 }
644
645 ret = devm_request_irq(&pdev->dev, owl_host->irq, owl_irq_handler,
646 0, dev_name(&pdev->dev), owl_host);
647 if (ret) {
648 dev_err(&pdev->dev, "Failed to request irq %d\n",
649 owl_host->irq);
650 goto err_release_channel;
651 }
652
653 ret = mmc_add_host(mmc);
654 if (ret) {
655 dev_err(&pdev->dev, "Failed to add host\n");
656 goto err_release_channel;
657 }
658
659 dev_dbg(&pdev->dev, "Owl MMC Controller Initialized\n");
660
661 return 0;
662
663 err_release_channel:
664 dma_release_channel(owl_host->dma);
665 err_free_host:
666 mmc_free_host(mmc);
667
668 return ret;
669 }
670
owl_mmc_remove(struct platform_device * pdev)671 static int owl_mmc_remove(struct platform_device *pdev)
672 {
673 struct mmc_host *mmc = platform_get_drvdata(pdev);
674 struct owl_mmc_host *owl_host = mmc_priv(mmc);
675
676 mmc_remove_host(mmc);
677 disable_irq(owl_host->irq);
678 dma_release_channel(owl_host->dma);
679 mmc_free_host(mmc);
680
681 return 0;
682 }
683
684 static const struct of_device_id owl_mmc_of_match[] = {
685 {.compatible = "actions,owl-mmc",},
686 { /* sentinel */ }
687 };
688 MODULE_DEVICE_TABLE(of, owl_mmc_of_match);
689
690 static struct platform_driver owl_mmc_driver = {
691 .driver = {
692 .name = "owl_mmc",
693 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
694 .of_match_table = owl_mmc_of_match,
695 },
696 .probe = owl_mmc_probe,
697 .remove = owl_mmc_remove,
698 };
699 module_platform_driver(owl_mmc_driver);
700
701 MODULE_DESCRIPTION("Actions Semi Owl SoCs SD/MMC Driver");
702 MODULE_AUTHOR("Actions Semi");
703 MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
704 MODULE_LICENSE("GPL");
705
