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Merge tag 'drm/tegra/for-5.7-fixes' of git://anongit.freedesktop.org/tegra/linux...
[thirdparty/linux.git] / drivers / mmc / host / meson-mx-sdio.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * meson-mx-sdio.c - Meson6, Meson8 and Meson8b SDIO/MMC Host Controller
4 *
5 * Copyright (C) 2015 Endless Mobile, Inc.
6 * Author: Carlo Caione <carlo@endlessm.com>
7 * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
8 */
9
10 #include <linux/bitfield.h>
11 #include <linux/clk.h>
12 #include <linux/clk-provider.h>
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/module.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/ioport.h>
20 #include <linux/platform_device.h>
21 #include <linux/of_platform.h>
22 #include <linux/timer.h>
23 #include <linux/types.h>
24
25 #include <linux/mmc/host.h>
26 #include <linux/mmc/mmc.h>
27 #include <linux/mmc/sdio.h>
28 #include <linux/mmc/slot-gpio.h>
29
30 #define MESON_MX_SDIO_ARGU 0x00
31
32 #define MESON_MX_SDIO_SEND 0x04
33 #define MESON_MX_SDIO_SEND_COMMAND_INDEX_MASK GENMASK(7, 0)
34 #define MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK GENMASK(15, 8)
35 #define MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7 BIT(16)
36 #define MESON_MX_SDIO_SEND_RESP_HAS_DATA BIT(17)
37 #define MESON_MX_SDIO_SEND_RESP_CRC7_FROM_8 BIT(18)
38 #define MESON_MX_SDIO_SEND_CHECK_DAT0_BUSY BIT(19)
39 #define MESON_MX_SDIO_SEND_DATA BIT(20)
40 #define MESON_MX_SDIO_SEND_USE_INT_WINDOW BIT(21)
41 #define MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK GENMASK(31, 24)
42
43 #define MESON_MX_SDIO_CONF 0x08
44 #define MESON_MX_SDIO_CONF_CMD_CLK_DIV_SHIFT 0
45 #define MESON_MX_SDIO_CONF_CMD_CLK_DIV_WIDTH 10
46 #define MESON_MX_SDIO_CONF_CMD_DISABLE_CRC BIT(10)
47 #define MESON_MX_SDIO_CONF_CMD_OUT_AT_POSITIVE_EDGE BIT(11)
48 #define MESON_MX_SDIO_CONF_CMD_ARGUMENT_BITS_MASK GENMASK(17, 12)
49 #define MESON_MX_SDIO_CONF_RESP_LATCH_AT_NEGATIVE_EDGE BIT(18)
50 #define MESON_MX_SDIO_CONF_DATA_LATCH_AT_NEGATIVE_EDGE BIT(19)
51 #define MESON_MX_SDIO_CONF_BUS_WIDTH BIT(20)
52 #define MESON_MX_SDIO_CONF_M_ENDIAN_MASK GENMASK(22, 21)
53 #define MESON_MX_SDIO_CONF_WRITE_NWR_MASK GENMASK(28, 23)
54 #define MESON_MX_SDIO_CONF_WRITE_CRC_OK_STATUS_MASK GENMASK(31, 29)
55
56 #define MESON_MX_SDIO_IRQS 0x0c
57 #define MESON_MX_SDIO_IRQS_STATUS_STATE_MACHINE_MASK GENMASK(3, 0)
58 #define MESON_MX_SDIO_IRQS_CMD_BUSY BIT(4)
59 #define MESON_MX_SDIO_IRQS_RESP_CRC7_OK BIT(5)
60 #define MESON_MX_SDIO_IRQS_DATA_READ_CRC16_OK BIT(6)
61 #define MESON_MX_SDIO_IRQS_DATA_WRITE_CRC16_OK BIT(7)
62 #define MESON_MX_SDIO_IRQS_IF_INT BIT(8)
63 #define MESON_MX_SDIO_IRQS_CMD_INT BIT(9)
64 #define MESON_MX_SDIO_IRQS_STATUS_INFO_MASK GENMASK(15, 12)
65 #define MESON_MX_SDIO_IRQS_TIMING_OUT_INT BIT(16)
66 #define MESON_MX_SDIO_IRQS_AMRISC_TIMING_OUT_INT_EN BIT(17)
67 #define MESON_MX_SDIO_IRQS_ARC_TIMING_OUT_INT_EN BIT(18)
68 #define MESON_MX_SDIO_IRQS_TIMING_OUT_COUNT_MASK GENMASK(31, 19)
69
70 #define MESON_MX_SDIO_IRQC 0x10
71 #define MESON_MX_SDIO_IRQC_ARC_IF_INT_EN BIT(3)
72 #define MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN BIT(4)
73 #define MESON_MX_SDIO_IRQC_IF_CONFIG_MASK GENMASK(7, 6)
74 #define MESON_MX_SDIO_IRQC_FORCE_DATA_CLK BIT(8)
75 #define MESON_MX_SDIO_IRQC_FORCE_DATA_CMD BIT(9)
76 #define MESON_MX_SDIO_IRQC_FORCE_DATA_DAT_MASK GENMASK(13, 10)
77 #define MESON_MX_SDIO_IRQC_SOFT_RESET BIT(15)
78 #define MESON_MX_SDIO_IRQC_FORCE_HALT BIT(30)
79 #define MESON_MX_SDIO_IRQC_HALT_HOLE BIT(31)
80
81 #define MESON_MX_SDIO_MULT 0x14
82 #define MESON_MX_SDIO_MULT_PORT_SEL_MASK GENMASK(1, 0)
83 #define MESON_MX_SDIO_MULT_MEMORY_STICK_ENABLE BIT(2)
84 #define MESON_MX_SDIO_MULT_MEMORY_STICK_SCLK_ALWAYS BIT(3)
85 #define MESON_MX_SDIO_MULT_STREAM_ENABLE BIT(4)
86 #define MESON_MX_SDIO_MULT_STREAM_8BITS_MODE BIT(5)
87 #define MESON_MX_SDIO_MULT_WR_RD_OUT_INDEX BIT(8)
88 #define MESON_MX_SDIO_MULT_DAT0_DAT1_SWAPPED BIT(10)
89 #define MESON_MX_SDIO_MULT_DAT1_DAT0_SWAPPED BIT(11)
90 #define MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK GENMASK(15, 12)
91
92 #define MESON_MX_SDIO_ADDR 0x18
93
94 #define MESON_MX_SDIO_EXT 0x1c
95 #define MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK GENMASK(29, 16)
96
97 #define MESON_MX_SDIO_BOUNCE_REQ_SIZE (128 * 1024)
98 #define MESON_MX_SDIO_RESPONSE_CRC16_BITS (16 - 1)
99 #define MESON_MX_SDIO_MAX_SLOTS 3
100
101 struct meson_mx_mmc_host {
102 struct device *controller_dev;
103
104 struct clk *parent_clk;
105 struct clk *core_clk;
106 struct clk_divider cfg_div;
107 struct clk *cfg_div_clk;
108 struct clk_fixed_factor fixed_factor;
109 struct clk *fixed_factor_clk;
110
111 void __iomem *base;
112 int irq;
113 spinlock_t irq_lock;
114
115 struct timer_list cmd_timeout;
116
117 unsigned int slot_id;
118 struct mmc_host *mmc;
119
120 struct mmc_request *mrq;
121 struct mmc_command *cmd;
122 int error;
123 };
124
125 static void meson_mx_mmc_mask_bits(struct mmc_host *mmc, char reg, u32 mask,
126 u32 val)
127 {
128 struct meson_mx_mmc_host *host = mmc_priv(mmc);
129 u32 regval;
130
131 regval = readl(host->base + reg);
132 regval &= ~mask;
133 regval |= (val & mask);
134
135 writel(regval, host->base + reg);
136 }
137
138 static void meson_mx_mmc_soft_reset(struct meson_mx_mmc_host *host)
139 {
140 writel(MESON_MX_SDIO_IRQC_SOFT_RESET, host->base + MESON_MX_SDIO_IRQC);
141 udelay(2);
142 }
143
144 static struct mmc_command *meson_mx_mmc_get_next_cmd(struct mmc_command *cmd)
145 {
146 if (cmd->opcode == MMC_SET_BLOCK_COUNT && !cmd->error)
147 return cmd->mrq->cmd;
148 else if (mmc_op_multi(cmd->opcode) &&
149 (!cmd->mrq->sbc || cmd->error || cmd->data->error))
150 return cmd->mrq->stop;
151 else
152 return NULL;
153 }
154
155 static void meson_mx_mmc_start_cmd(struct mmc_host *mmc,
156 struct mmc_command *cmd)
157 {
158 struct meson_mx_mmc_host *host = mmc_priv(mmc);
159 unsigned int pack_size;
160 unsigned long irqflags, timeout;
161 u32 mult, send = 0, ext = 0;
162
163 host->cmd = cmd;
164
165 if (cmd->busy_timeout)
166 timeout = msecs_to_jiffies(cmd->busy_timeout);
167 else
168 timeout = msecs_to_jiffies(1000);
169
170 switch (mmc_resp_type(cmd)) {
171 case MMC_RSP_R1:
172 case MMC_RSP_R1B:
173 case MMC_RSP_R3:
174 /* 7 (CMD) + 32 (response) + 7 (CRC) -1 */
175 send |= FIELD_PREP(MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK, 45);
176 break;
177 case MMC_RSP_R2:
178 /* 7 (CMD) + 120 (response) + 7 (CRC) -1 */
179 send |= FIELD_PREP(MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK, 133);
180 send |= MESON_MX_SDIO_SEND_RESP_CRC7_FROM_8;
181 break;
182 default:
183 break;
184 }
185
186 if (!(cmd->flags & MMC_RSP_CRC))
187 send |= MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7;
188
189 if (cmd->flags & MMC_RSP_BUSY)
190 send |= MESON_MX_SDIO_SEND_CHECK_DAT0_BUSY;
191
192 if (cmd->data) {
193 send |= FIELD_PREP(MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK,
194 (cmd->data->blocks - 1));
195
196 pack_size = cmd->data->blksz * BITS_PER_BYTE;
197 if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
198 pack_size += MESON_MX_SDIO_RESPONSE_CRC16_BITS * 4;
199 else
200 pack_size += MESON_MX_SDIO_RESPONSE_CRC16_BITS * 1;
201
202 ext |= FIELD_PREP(MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK,
203 pack_size);
204
205 if (cmd->data->flags & MMC_DATA_WRITE)
206 send |= MESON_MX_SDIO_SEND_DATA;
207 else
208 send |= MESON_MX_SDIO_SEND_RESP_HAS_DATA;
209
210 cmd->data->bytes_xfered = 0;
211 }
212
213 send |= FIELD_PREP(MESON_MX_SDIO_SEND_COMMAND_INDEX_MASK,
214 (0x40 | cmd->opcode));
215
216 spin_lock_irqsave(&host->irq_lock, irqflags);
217
218 mult = readl(host->base + MESON_MX_SDIO_MULT);
219 mult &= ~MESON_MX_SDIO_MULT_PORT_SEL_MASK;
220 mult |= FIELD_PREP(MESON_MX_SDIO_MULT_PORT_SEL_MASK, host->slot_id);
221 mult |= BIT(31);
222 writel(mult, host->base + MESON_MX_SDIO_MULT);
223
224 /* enable the CMD done interrupt */
225 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_IRQC,
226 MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN,
227 MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN);
228
229 /* clear pending interrupts */
230 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_IRQS,
231 MESON_MX_SDIO_IRQS_CMD_INT,
232 MESON_MX_SDIO_IRQS_CMD_INT);
233
234 writel(cmd->arg, host->base + MESON_MX_SDIO_ARGU);
235 writel(ext, host->base + MESON_MX_SDIO_EXT);
236 writel(send, host->base + MESON_MX_SDIO_SEND);
237
238 spin_unlock_irqrestore(&host->irq_lock, irqflags);
239
240 mod_timer(&host->cmd_timeout, jiffies + timeout);
241 }
242
243 static void meson_mx_mmc_request_done(struct meson_mx_mmc_host *host)
244 {
245 struct mmc_request *mrq;
246
247 mrq = host->mrq;
248
249 host->mrq = NULL;
250 host->cmd = NULL;
251
252 mmc_request_done(host->mmc, mrq);
253 }
254
255 static void meson_mx_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
256 {
257 struct meson_mx_mmc_host *host = mmc_priv(mmc);
258 unsigned short vdd = ios->vdd;
259 unsigned long clk_rate = ios->clock;
260
261 switch (ios->bus_width) {
262 case MMC_BUS_WIDTH_1:
263 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_CONF,
264 MESON_MX_SDIO_CONF_BUS_WIDTH, 0);
265 break;
266
267 case MMC_BUS_WIDTH_4:
268 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_CONF,
269 MESON_MX_SDIO_CONF_BUS_WIDTH,
270 MESON_MX_SDIO_CONF_BUS_WIDTH);
271 break;
272
273 case MMC_BUS_WIDTH_8:
274 default:
275 dev_err(mmc_dev(mmc), "unsupported bus width: %d\n",
276 ios->bus_width);
277 host->error = -EINVAL;
278 return;
279 }
280
281 host->error = clk_set_rate(host->cfg_div_clk, ios->clock);
282 if (host->error) {
283 dev_warn(mmc_dev(mmc),
284 "failed to set MMC clock to %lu: %d\n",
285 clk_rate, host->error);
286 return;
287 }
288
289 mmc->actual_clock = clk_get_rate(host->cfg_div_clk);
290
291 switch (ios->power_mode) {
292 case MMC_POWER_OFF:
293 vdd = 0;
294 /* fall through */
295 case MMC_POWER_UP:
296 if (!IS_ERR(mmc->supply.vmmc)) {
297 host->error = mmc_regulator_set_ocr(mmc,
298 mmc->supply.vmmc,
299 vdd);
300 if (host->error)
301 return;
302 }
303 break;
304 }
305 }
306
307 static int meson_mx_mmc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq)
308 {
309 struct mmc_data *data = mrq->data;
310 int dma_len;
311 struct scatterlist *sg;
312
313 if (!data)
314 return 0;
315
316 sg = data->sg;
317 if (sg->offset & 3 || sg->length & 3) {
318 dev_err(mmc_dev(mmc),
319 "unaligned scatterlist: offset %x length %d\n",
320 sg->offset, sg->length);
321 return -EINVAL;
322 }
323
324 dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
325 mmc_get_dma_dir(data));
326 if (dma_len <= 0) {
327 dev_err(mmc_dev(mmc), "dma_map_sg failed\n");
328 return -ENOMEM;
329 }
330
331 return 0;
332 }
333
334 static void meson_mx_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
335 {
336 struct meson_mx_mmc_host *host = mmc_priv(mmc);
337 struct mmc_command *cmd = mrq->cmd;
338
339 if (!host->error)
340 host->error = meson_mx_mmc_map_dma(mmc, mrq);
341
342 if (host->error) {
343 cmd->error = host->error;
344 mmc_request_done(mmc, mrq);
345 return;
346 }
347
348 host->mrq = mrq;
349
350 if (mrq->data)
351 writel(sg_dma_address(mrq->data->sg),
352 host->base + MESON_MX_SDIO_ADDR);
353
354 if (mrq->sbc)
355 meson_mx_mmc_start_cmd(mmc, mrq->sbc);
356 else
357 meson_mx_mmc_start_cmd(mmc, mrq->cmd);
358 }
359
360 static void meson_mx_mmc_read_response(struct mmc_host *mmc,
361 struct mmc_command *cmd)
362 {
363 struct meson_mx_mmc_host *host = mmc_priv(mmc);
364 u32 mult;
365 int i, resp[4];
366
367 mult = readl(host->base + MESON_MX_SDIO_MULT);
368 mult |= MESON_MX_SDIO_MULT_WR_RD_OUT_INDEX;
369 mult &= ~MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK;
370 mult |= FIELD_PREP(MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK, 0);
371 writel(mult, host->base + MESON_MX_SDIO_MULT);
372
373 if (cmd->flags & MMC_RSP_136) {
374 for (i = 0; i <= 3; i++)
375 resp[3 - i] = readl(host->base + MESON_MX_SDIO_ARGU);
376 cmd->resp[0] = (resp[0] << 8) | ((resp[1] >> 24) & 0xff);
377 cmd->resp[1] = (resp[1] << 8) | ((resp[2] >> 24) & 0xff);
378 cmd->resp[2] = (resp[2] << 8) | ((resp[3] >> 24) & 0xff);
379 cmd->resp[3] = (resp[3] << 8);
380 } else if (cmd->flags & MMC_RSP_PRESENT) {
381 cmd->resp[0] = readl(host->base + MESON_MX_SDIO_ARGU);
382 }
383 }
384
385 static irqreturn_t meson_mx_mmc_process_cmd_irq(struct meson_mx_mmc_host *host,
386 u32 irqs, u32 send)
387 {
388 struct mmc_command *cmd = host->cmd;
389
390 /*
391 * NOTE: even though it shouldn't happen we sometimes get command
392 * interrupts twice (at least this is what it looks like). Ideally
393 * we find out why this happens and warn here as soon as it occurs.
394 */
395 if (!cmd)
396 return IRQ_HANDLED;
397
398 cmd->error = 0;
399 meson_mx_mmc_read_response(host->mmc, cmd);
400
401 if (cmd->data) {
402 if (!((irqs & MESON_MX_SDIO_IRQS_DATA_READ_CRC16_OK) ||
403 (irqs & MESON_MX_SDIO_IRQS_DATA_WRITE_CRC16_OK)))
404 cmd->error = -EILSEQ;
405 } else {
406 if (!((irqs & MESON_MX_SDIO_IRQS_RESP_CRC7_OK) ||
407 (send & MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7)))
408 cmd->error = -EILSEQ;
409 }
410
411 return IRQ_WAKE_THREAD;
412 }
413
414 static irqreturn_t meson_mx_mmc_irq(int irq, void *data)
415 {
416 struct meson_mx_mmc_host *host = (void *) data;
417 u32 irqs, send;
418 unsigned long irqflags;
419 irqreturn_t ret;
420
421 spin_lock_irqsave(&host->irq_lock, irqflags);
422
423 irqs = readl(host->base + MESON_MX_SDIO_IRQS);
424 send = readl(host->base + MESON_MX_SDIO_SEND);
425
426 if (irqs & MESON_MX_SDIO_IRQS_CMD_INT)
427 ret = meson_mx_mmc_process_cmd_irq(host, irqs, send);
428 else
429 ret = IRQ_HANDLED;
430
431 /* finally ACK all pending interrupts */
432 writel(irqs, host->base + MESON_MX_SDIO_IRQS);
433
434 spin_unlock_irqrestore(&host->irq_lock, irqflags);
435
436 return ret;
437 }
438
439 static irqreturn_t meson_mx_mmc_irq_thread(int irq, void *irq_data)
440 {
441 struct meson_mx_mmc_host *host = (void *) irq_data;
442 struct mmc_command *cmd = host->cmd, *next_cmd;
443
444 if (WARN_ON(!cmd))
445 return IRQ_HANDLED;
446
447 del_timer_sync(&host->cmd_timeout);
448
449 if (cmd->data) {
450 dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg,
451 cmd->data->sg_len,
452 mmc_get_dma_dir(cmd->data));
453
454 cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks;
455 }
456
457 next_cmd = meson_mx_mmc_get_next_cmd(cmd);
458 if (next_cmd)
459 meson_mx_mmc_start_cmd(host->mmc, next_cmd);
460 else
461 meson_mx_mmc_request_done(host);
462
463 return IRQ_HANDLED;
464 }
465
466 static void meson_mx_mmc_timeout(struct timer_list *t)
467 {
468 struct meson_mx_mmc_host *host = from_timer(host, t, cmd_timeout);
469 unsigned long irqflags;
470 u32 irqc;
471
472 spin_lock_irqsave(&host->irq_lock, irqflags);
473
474 /* disable the CMD interrupt */
475 irqc = readl(host->base + MESON_MX_SDIO_IRQC);
476 irqc &= ~MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN;
477 writel(irqc, host->base + MESON_MX_SDIO_IRQC);
478
479 spin_unlock_irqrestore(&host->irq_lock, irqflags);
480
481 /*
482 * skip the timeout handling if the interrupt handler already processed
483 * the command.
484 */
485 if (!host->cmd)
486 return;
487
488 dev_dbg(mmc_dev(host->mmc),
489 "Timeout on CMD%u (IRQS = 0x%08x, ARGU = 0x%08x)\n",
490 host->cmd->opcode, readl(host->base + MESON_MX_SDIO_IRQS),
491 readl(host->base + MESON_MX_SDIO_ARGU));
492
493 host->cmd->error = -ETIMEDOUT;
494
495 meson_mx_mmc_request_done(host);
496 }
497
498 static struct mmc_host_ops meson_mx_mmc_ops = {
499 .request = meson_mx_mmc_request,
500 .set_ios = meson_mx_mmc_set_ios,
501 .get_cd = mmc_gpio_get_cd,
502 .get_ro = mmc_gpio_get_ro,
503 };
504
505 static struct platform_device *meson_mx_mmc_slot_pdev(struct device *parent)
506 {
507 struct device_node *slot_node;
508 struct platform_device *pdev;
509
510 /*
511 * TODO: the MMC core framework currently does not support
512 * controllers with multiple slots properly. So we only register
513 * the first slot for now
514 */
515 slot_node = of_get_compatible_child(parent->of_node, "mmc-slot");
516 if (!slot_node) {
517 dev_warn(parent, "no 'mmc-slot' sub-node found\n");
518 return ERR_PTR(-ENOENT);
519 }
520
521 pdev = of_platform_device_create(slot_node, NULL, parent);
522 of_node_put(slot_node);
523
524 return pdev;
525 }
526
527 static int meson_mx_mmc_add_host(struct meson_mx_mmc_host *host)
528 {
529 struct mmc_host *mmc = host->mmc;
530 struct device *slot_dev = mmc_dev(mmc);
531 int ret;
532
533 if (of_property_read_u32(slot_dev->of_node, "reg", &host->slot_id)) {
534 dev_err(slot_dev, "missing 'reg' property\n");
535 return -EINVAL;
536 }
537
538 if (host->slot_id >= MESON_MX_SDIO_MAX_SLOTS) {
539 dev_err(slot_dev, "invalid 'reg' property value %d\n",
540 host->slot_id);
541 return -EINVAL;
542 }
543
544 /* Get regulators and the supported OCR mask */
545 ret = mmc_regulator_get_supply(mmc);
546 if (ret)
547 return ret;
548
549 mmc->max_req_size = MESON_MX_SDIO_BOUNCE_REQ_SIZE;
550 mmc->max_seg_size = mmc->max_req_size;
551 mmc->max_blk_count =
552 FIELD_GET(MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK,
553 0xffffffff);
554 mmc->max_blk_size = FIELD_GET(MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK,
555 0xffffffff);
556 mmc->max_blk_size -= (4 * MESON_MX_SDIO_RESPONSE_CRC16_BITS);
557 mmc->max_blk_size /= BITS_PER_BYTE;
558
559 /* Get the min and max supported clock rates */
560 mmc->f_min = clk_round_rate(host->cfg_div_clk, 1);
561 mmc->f_max = clk_round_rate(host->cfg_div_clk,
562 clk_get_rate(host->parent_clk));
563
564 mmc->caps |= MMC_CAP_ERASE | MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY;
565 mmc->ops = &meson_mx_mmc_ops;
566
567 ret = mmc_of_parse(mmc);
568 if (ret)
569 return ret;
570
571 ret = mmc_add_host(mmc);
572 if (ret)
573 return ret;
574
575 return 0;
576 }
577
578 static int meson_mx_mmc_register_clks(struct meson_mx_mmc_host *host)
579 {
580 struct clk_init_data init;
581 const char *clk_div_parent, *clk_fixed_factor_parent;
582
583 clk_fixed_factor_parent = __clk_get_name(host->parent_clk);
584 init.name = devm_kasprintf(host->controller_dev, GFP_KERNEL,
585 "%s#fixed_factor",
586 dev_name(host->controller_dev));
587 if (!init.name)
588 return -ENOMEM;
589
590 init.ops = &clk_fixed_factor_ops;
591 init.flags = 0;
592 init.parent_names = &clk_fixed_factor_parent;
593 init.num_parents = 1;
594 host->fixed_factor.div = 2;
595 host->fixed_factor.mult = 1;
596 host->fixed_factor.hw.init = &init;
597
598 host->fixed_factor_clk = devm_clk_register(host->controller_dev,
599 &host->fixed_factor.hw);
600 if (WARN_ON(IS_ERR(host->fixed_factor_clk)))
601 return PTR_ERR(host->fixed_factor_clk);
602
603 clk_div_parent = __clk_get_name(host->fixed_factor_clk);
604 init.name = devm_kasprintf(host->controller_dev, GFP_KERNEL,
605 "%s#div", dev_name(host->controller_dev));
606 if (!init.name)
607 return -ENOMEM;
608
609 init.ops = &clk_divider_ops;
610 init.flags = CLK_SET_RATE_PARENT;
611 init.parent_names = &clk_div_parent;
612 init.num_parents = 1;
613 host->cfg_div.reg = host->base + MESON_MX_SDIO_CONF;
614 host->cfg_div.shift = MESON_MX_SDIO_CONF_CMD_CLK_DIV_SHIFT;
615 host->cfg_div.width = MESON_MX_SDIO_CONF_CMD_CLK_DIV_WIDTH;
616 host->cfg_div.hw.init = &init;
617 host->cfg_div.flags = CLK_DIVIDER_ALLOW_ZERO;
618
619 host->cfg_div_clk = devm_clk_register(host->controller_dev,
620 &host->cfg_div.hw);
621 if (WARN_ON(IS_ERR(host->cfg_div_clk)))
622 return PTR_ERR(host->cfg_div_clk);
623
624 return 0;
625 }
626
627 static int meson_mx_mmc_probe(struct platform_device *pdev)
628 {
629 struct platform_device *slot_pdev;
630 struct mmc_host *mmc;
631 struct meson_mx_mmc_host *host;
632 int ret, irq;
633 u32 conf;
634
635 slot_pdev = meson_mx_mmc_slot_pdev(&pdev->dev);
636 if (!slot_pdev)
637 return -ENODEV;
638 else if (IS_ERR(slot_pdev))
639 return PTR_ERR(slot_pdev);
640
641 mmc = mmc_alloc_host(sizeof(*host), &slot_pdev->dev);
642 if (!mmc) {
643 ret = -ENOMEM;
644 goto error_unregister_slot_pdev;
645 }
646
647 host = mmc_priv(mmc);
648 host->mmc = mmc;
649 host->controller_dev = &pdev->dev;
650
651 spin_lock_init(&host->irq_lock);
652 timer_setup(&host->cmd_timeout, meson_mx_mmc_timeout, 0);
653
654 platform_set_drvdata(pdev, host);
655
656 host->base = devm_platform_ioremap_resource(pdev, 0);
657 if (IS_ERR(host->base)) {
658 ret = PTR_ERR(host->base);
659 goto error_free_mmc;
660 }
661
662 irq = platform_get_irq(pdev, 0);
663 ret = devm_request_threaded_irq(host->controller_dev, irq,
664 meson_mx_mmc_irq,
665 meson_mx_mmc_irq_thread, IRQF_ONESHOT,
666 NULL, host);
667 if (ret)
668 goto error_free_mmc;
669
670 host->core_clk = devm_clk_get(host->controller_dev, "core");
671 if (IS_ERR(host->core_clk)) {
672 ret = PTR_ERR(host->core_clk);
673 goto error_free_mmc;
674 }
675
676 host->parent_clk = devm_clk_get(host->controller_dev, "clkin");
677 if (IS_ERR(host->parent_clk)) {
678 ret = PTR_ERR(host->parent_clk);
679 goto error_free_mmc;
680 }
681
682 ret = meson_mx_mmc_register_clks(host);
683 if (ret)
684 goto error_free_mmc;
685
686 ret = clk_prepare_enable(host->core_clk);
687 if (ret) {
688 dev_err(host->controller_dev, "Failed to enable core clock\n");
689 goto error_free_mmc;
690 }
691
692 ret = clk_prepare_enable(host->cfg_div_clk);
693 if (ret) {
694 dev_err(host->controller_dev, "Failed to enable MMC clock\n");
695 goto error_disable_core_clk;
696 }
697
698 conf = 0;
699 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_CMD_ARGUMENT_BITS_MASK, 39);
700 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_M_ENDIAN_MASK, 0x3);
701 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_WRITE_NWR_MASK, 0x2);
702 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_WRITE_CRC_OK_STATUS_MASK, 0x2);
703 writel(conf, host->base + MESON_MX_SDIO_CONF);
704
705 meson_mx_mmc_soft_reset(host);
706
707 ret = meson_mx_mmc_add_host(host);
708 if (ret)
709 goto error_disable_clks;
710
711 return 0;
712
713 error_disable_clks:
714 clk_disable_unprepare(host->cfg_div_clk);
715 error_disable_core_clk:
716 clk_disable_unprepare(host->core_clk);
717 error_free_mmc:
718 mmc_free_host(mmc);
719 error_unregister_slot_pdev:
720 of_platform_device_destroy(&slot_pdev->dev, NULL);
721 return ret;
722 }
723
724 static int meson_mx_mmc_remove(struct platform_device *pdev)
725 {
726 struct meson_mx_mmc_host *host = platform_get_drvdata(pdev);
727 struct device *slot_dev = mmc_dev(host->mmc);
728
729 del_timer_sync(&host->cmd_timeout);
730
731 mmc_remove_host(host->mmc);
732
733 of_platform_device_destroy(slot_dev, NULL);
734
735 clk_disable_unprepare(host->cfg_div_clk);
736 clk_disable_unprepare(host->core_clk);
737
738 mmc_free_host(host->mmc);
739
740 return 0;
741 }
742
743 static const struct of_device_id meson_mx_mmc_of_match[] = {
744 { .compatible = "amlogic,meson8-sdio", },
745 { .compatible = "amlogic,meson8b-sdio", },
746 { /* sentinel */ }
747 };
748 MODULE_DEVICE_TABLE(of, meson_mx_mmc_of_match);
749
750 static struct platform_driver meson_mx_mmc_driver = {
751 .probe = meson_mx_mmc_probe,
752 .remove = meson_mx_mmc_remove,
753 .driver = {
754 .name = "meson-mx-sdio",
755 .of_match_table = of_match_ptr(meson_mx_mmc_of_match),
756 },
757 };
758
759 module_platform_driver(meson_mx_mmc_driver);
760
761 MODULE_DESCRIPTION("Meson6, Meson8 and Meson8b SDIO/MMC Host Driver");
762 MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
763 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
764 MODULE_LICENSE("GPL v2");
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