?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / drivers / mmc / host / meson-mx-sdio.c
blobabe253c262a2e4399abe27e62c758d7133f7ada2
1 /*
2 * meson-mx-sdio.c - Meson6, Meson8 and Meson8b SDIO/MMC Host Controller
3 *
4 * Copyright (C) 2015 Endless Mobile, Inc.
5 * Author: Carlo Caione <carlo@endlessm.com>
6 * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 */
13
14 #include <linux/bitfield.h>
15 #include <linux/clk.h>
16 #include <linux/clk-provider.h>
17 #include <linux/delay.h>
18 #include <linux/device.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/module.h>
21 #include <linux/interrupt.h>
22 #include <linux/ioport.h>
23 #include <linux/platform_device.h>
24 #include <linux/of_platform.h>
25 #include <linux/timer.h>
26 #include <linux/types.h>
27
28 #include <linux/mmc/host.h>
29 #include <linux/mmc/mmc.h>
30 #include <linux/mmc/sdio.h>
31 #include <linux/mmc/slot-gpio.h>
32
33 #define MESON_MX_SDIO_ARGU 0x00
34
35 #define MESON_MX_SDIO_SEND 0x04
36 #define MESON_MX_SDIO_SEND_COMMAND_INDEX_MASK GENMASK(7, 0)
37 #define MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK GENMASK(15, 8)
38 #define MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7 BIT(16)
39 #define MESON_MX_SDIO_SEND_RESP_HAS_DATA BIT(17)
40 #define MESON_MX_SDIO_SEND_RESP_CRC7_FROM_8 BIT(18)
41 #define MESON_MX_SDIO_SEND_CHECK_DAT0_BUSY BIT(19)
42 #define MESON_MX_SDIO_SEND_DATA BIT(20)
43 #define MESON_MX_SDIO_SEND_USE_INT_WINDOW BIT(21)
44 #define MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK GENMASK(31, 24)
45
46 #define MESON_MX_SDIO_CONF 0x08
47 #define MESON_MX_SDIO_CONF_CMD_CLK_DIV_SHIFT 0
48 #define MESON_MX_SDIO_CONF_CMD_CLK_DIV_WIDTH 10
49 #define MESON_MX_SDIO_CONF_CMD_DISABLE_CRC BIT(10)
50 #define MESON_MX_SDIO_CONF_CMD_OUT_AT_POSITIVE_EDGE BIT(11)
51 #define MESON_MX_SDIO_CONF_CMD_ARGUMENT_BITS_MASK GENMASK(17, 12)
52 #define MESON_MX_SDIO_CONF_RESP_LATCH_AT_NEGATIVE_EDGE BIT(18)
53 #define MESON_MX_SDIO_CONF_DATA_LATCH_AT_NEGATIVE_EDGE BIT(19)
54 #define MESON_MX_SDIO_CONF_BUS_WIDTH BIT(20)
55 #define MESON_MX_SDIO_CONF_M_ENDIAN_MASK GENMASK(22, 21)
56 #define MESON_MX_SDIO_CONF_WRITE_NWR_MASK GENMASK(28, 23)
57 #define MESON_MX_SDIO_CONF_WRITE_CRC_OK_STATUS_MASK GENMASK(31, 29)
58
59 #define MESON_MX_SDIO_IRQS 0x0c
60 #define MESON_MX_SDIO_IRQS_STATUS_STATE_MACHINE_MASK GENMASK(3, 0)
61 #define MESON_MX_SDIO_IRQS_CMD_BUSY BIT(4)
62 #define MESON_MX_SDIO_IRQS_RESP_CRC7_OK BIT(5)
63 #define MESON_MX_SDIO_IRQS_DATA_READ_CRC16_OK BIT(6)
64 #define MESON_MX_SDIO_IRQS_DATA_WRITE_CRC16_OK BIT(7)
65 #define MESON_MX_SDIO_IRQS_IF_INT BIT(8)
66 #define MESON_MX_SDIO_IRQS_CMD_INT BIT(9)
67 #define MESON_MX_SDIO_IRQS_STATUS_INFO_MASK GENMASK(15, 12)
68 #define MESON_MX_SDIO_IRQS_TIMING_OUT_INT BIT(16)
69 #define MESON_MX_SDIO_IRQS_AMRISC_TIMING_OUT_INT_EN BIT(17)
70 #define MESON_MX_SDIO_IRQS_ARC_TIMING_OUT_INT_EN BIT(18)
71 #define MESON_MX_SDIO_IRQS_TIMING_OUT_COUNT_MASK GENMASK(31, 19)
72
73 #define MESON_MX_SDIO_IRQC 0x10
74 #define MESON_MX_SDIO_IRQC_ARC_IF_INT_EN BIT(3)
75 #define MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN BIT(4)
76 #define MESON_MX_SDIO_IRQC_IF_CONFIG_MASK GENMASK(7, 6)
77 #define MESON_MX_SDIO_IRQC_FORCE_DATA_CLK BIT(8)
78 #define MESON_MX_SDIO_IRQC_FORCE_DATA_CMD BIT(9)
79 #define MESON_MX_SDIO_IRQC_FORCE_DATA_DAT_MASK GENMASK(10, 13)
80 #define MESON_MX_SDIO_IRQC_SOFT_RESET BIT(15)
81 #define MESON_MX_SDIO_IRQC_FORCE_HALT BIT(30)
82 #define MESON_MX_SDIO_IRQC_HALT_HOLE BIT(31)
83
84 #define MESON_MX_SDIO_MULT 0x14
85 #define MESON_MX_SDIO_MULT_PORT_SEL_MASK GENMASK(1, 0)
86 #define MESON_MX_SDIO_MULT_MEMORY_STICK_ENABLE BIT(2)
87 #define MESON_MX_SDIO_MULT_MEMORY_STICK_SCLK_ALWAYS BIT(3)
88 #define MESON_MX_SDIO_MULT_STREAM_ENABLE BIT(4)
89 #define MESON_MX_SDIO_MULT_STREAM_8BITS_MODE BIT(5)
90 #define MESON_MX_SDIO_MULT_WR_RD_OUT_INDEX BIT(8)
91 #define MESON_MX_SDIO_MULT_DAT0_DAT1_SWAPPED BIT(10)
92 #define MESON_MX_SDIO_MULT_DAT1_DAT0_SWAPPED BIT(11)
93 #define MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK GENMASK(15, 12)
94
95 #define MESON_MX_SDIO_ADDR 0x18
96
97 #define MESON_MX_SDIO_EXT 0x1c
98 #define MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK GENMASK(29, 16)
99
100 #define MESON_MX_SDIO_BOUNCE_REQ_SIZE (128 * 1024)
101 #define MESON_MX_SDIO_RESPONSE_CRC16_BITS (16 - 1)
102 #define MESON_MX_SDIO_MAX_SLOTS 3
103
104 struct meson_mx_mmc_host {
105 struct device *controller_dev;
106
107 struct clk *parent_clk;
108 struct clk *core_clk;
109 struct clk_divider cfg_div;
110 struct clk *cfg_div_clk;
111 struct clk_fixed_factor fixed_factor;
112 struct clk *fixed_factor_clk;
113
114 void __iomem *base;
115 int irq;
116 spinlock_t irq_lock;
117
118 struct timer_list cmd_timeout;
119
120 unsigned int slot_id;
121 struct mmc_host *mmc;
122
123 struct mmc_request *mrq;
124 struct mmc_command *cmd;
125 int error;
126 };
127
128 static void meson_mx_mmc_mask_bits(struct mmc_host *mmc, char reg, u32 mask,
129 u32 val)
130 {
131 struct meson_mx_mmc_host *host = mmc_priv(mmc);
132 u32 regval;
133
134 regval = readl(host->base + reg);
135 regval &= ~mask;
136 regval |= (val & mask);
137
138 writel(regval, host->base + reg);
139 }
140
141 static void meson_mx_mmc_soft_reset(struct meson_mx_mmc_host *host)
142 {
143 writel(MESON_MX_SDIO_IRQC_SOFT_RESET, host->base + MESON_MX_SDIO_IRQC);
144 udelay(2);
145 }
146
147 static struct mmc_command *meson_mx_mmc_get_next_cmd(struct mmc_command *cmd)
148 {
149 if (cmd->opcode == MMC_SET_BLOCK_COUNT && !cmd->error)
150 return cmd->mrq->cmd;
151 else if (mmc_op_multi(cmd->opcode) &&
152 (!cmd->mrq->sbc || cmd->error || cmd->data->error))
153 return cmd->mrq->stop;
154 else
155 return NULL;
156 }
157
158 static void meson_mx_mmc_start_cmd(struct mmc_host *mmc,
159 struct mmc_command *cmd)
160 {
161 struct meson_mx_mmc_host *host = mmc_priv(mmc);
162 unsigned int pack_size;
163 unsigned long irqflags, timeout;
164 u32 mult, send = 0, ext = 0;
165
166 host->cmd = cmd;
167
168 if (cmd->busy_timeout)
169 timeout = msecs_to_jiffies(cmd->busy_timeout);
170 else
171 timeout = msecs_to_jiffies(1000);
172
173 switch (mmc_resp_type(cmd)) {
174 case MMC_RSP_R1:
175 case MMC_RSP_R1B:
176 case MMC_RSP_R3:
177 /* 7 (CMD) + 32 (response) + 7 (CRC) -1 */
178 send |= FIELD_PREP(MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK, 45);
179 break;
180 case MMC_RSP_R2:
181 /* 7 (CMD) + 120 (response) + 7 (CRC) -1 */
182 send |= FIELD_PREP(MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK, 133);
183 send |= MESON_MX_SDIO_SEND_RESP_CRC7_FROM_8;
184 break;
185 default:
186 break;
187 }
188
189 if (!(cmd->flags & MMC_RSP_CRC))
190 send |= MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7;
191
192 if (cmd->flags & MMC_RSP_BUSY)
193 send |= MESON_MX_SDIO_SEND_CHECK_DAT0_BUSY;
194
195 if (cmd->data) {
196 send |= FIELD_PREP(MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK,
197 (cmd->data->blocks - 1));
198
199 pack_size = cmd->data->blksz * BITS_PER_BYTE;
200 if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
201 pack_size += MESON_MX_SDIO_RESPONSE_CRC16_BITS * 4;
202 else
203 pack_size += MESON_MX_SDIO_RESPONSE_CRC16_BITS * 1;
204
205 ext |= FIELD_PREP(MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK,
206 pack_size);
207
208 if (cmd->data->flags & MMC_DATA_WRITE)
209 send |= MESON_MX_SDIO_SEND_DATA;
210 else
211 send |= MESON_MX_SDIO_SEND_RESP_HAS_DATA;
212
213 cmd->data->bytes_xfered = 0;
214 }
215
216 send |= FIELD_PREP(MESON_MX_SDIO_SEND_COMMAND_INDEX_MASK,
217 (0x40 | cmd->opcode));
218
219 spin_lock_irqsave(&host->irq_lock, irqflags);
220
221 mult = readl(host->base + MESON_MX_SDIO_MULT);
222 mult &= ~MESON_MX_SDIO_MULT_PORT_SEL_MASK;
223 mult |= FIELD_PREP(MESON_MX_SDIO_MULT_PORT_SEL_MASK, host->slot_id);
224 mult |= BIT(31);
225 writel(mult, host->base + MESON_MX_SDIO_MULT);
226
227 /* enable the CMD done interrupt */
228 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_IRQC,
229 MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN,
230 MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN);
231
232 /* clear pending interrupts */
233 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_IRQS,
234 MESON_MX_SDIO_IRQS_CMD_INT,
235 MESON_MX_SDIO_IRQS_CMD_INT);
236
237 writel(cmd->arg, host->base + MESON_MX_SDIO_ARGU);
238 writel(ext, host->base + MESON_MX_SDIO_EXT);
239 writel(send, host->base + MESON_MX_SDIO_SEND);
240
241 spin_unlock_irqrestore(&host->irq_lock, irqflags);
242
243 mod_timer(&host->cmd_timeout, jiffies + timeout);
244 }
245
246 static void meson_mx_mmc_request_done(struct meson_mx_mmc_host *host)
247 {
248 struct mmc_request *mrq;
249
250 mrq = host->mrq;
251
252 host->mrq = NULL;
253 host->cmd = NULL;
254
255 mmc_request_done(host->mmc, mrq);
256 }
257
258 static void meson_mx_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
259 {
260 struct meson_mx_mmc_host *host = mmc_priv(mmc);
261 unsigned short vdd = ios->vdd;
262 unsigned long clk_rate = ios->clock;
263
264 switch (ios->bus_width) {
265 case MMC_BUS_WIDTH_1:
266 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_CONF,
267 MESON_MX_SDIO_CONF_BUS_WIDTH, 0);
268 break;
269
270 case MMC_BUS_WIDTH_4:
271 meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_CONF,
272 MESON_MX_SDIO_CONF_BUS_WIDTH,
273 MESON_MX_SDIO_CONF_BUS_WIDTH);
274 break;
275
276 case MMC_BUS_WIDTH_8:
277 default:
278 dev_err(mmc_dev(mmc), "unsupported bus width: %d\n",
279 ios->bus_width);
280 host->error = -EINVAL;
281 return;
282 }
283
284 host->error = clk_set_rate(host->cfg_div_clk, ios->clock);
285 if (host->error) {
286 dev_warn(mmc_dev(mmc),
287 "failed to set MMC clock to %lu: %d\n",
288 clk_rate, host->error);
289 return;
290 }
291
292 mmc->actual_clock = clk_get_rate(host->cfg_div_clk);
293
294 switch (ios->power_mode) {
295 case MMC_POWER_OFF:
296 vdd = 0;
297 /* fall through */
298 case MMC_POWER_UP:
299 if (!IS_ERR(mmc->supply.vmmc)) {
300 host->error = mmc_regulator_set_ocr(mmc,
301 mmc->supply.vmmc,
302 vdd);
303 if (host->error)
304 return;
305 }
306 break;
307 }
308 }
309
310 static int meson_mx_mmc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq)
311 {
312 struct mmc_data *data = mrq->data;
313 int dma_len;
314 struct scatterlist *sg;
315
316 if (!data)
317 return 0;
318
319 sg = data->sg;
320 if (sg->offset & 3 || sg->length & 3) {
321 dev_err(mmc_dev(mmc),
322 "unaligned scatterlist: offset %x length %d\n",
323 sg->offset, sg->length);
324 return -EINVAL;
325 }
326
327 dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
328 mmc_get_dma_dir(data));
329 if (dma_len <= 0) {
330 dev_err(mmc_dev(mmc), "dma_map_sg failed\n");
331 return -ENOMEM;
332 }
333
334 return 0;
335 }
336
337 static void meson_mx_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
338 {
339 struct meson_mx_mmc_host *host = mmc_priv(mmc);
340 struct mmc_command *cmd = mrq->cmd;
341
342 if (!host->error)
343 host->error = meson_mx_mmc_map_dma(mmc, mrq);
344
345 if (host->error) {
346 cmd->error = host->error;
347 mmc_request_done(mmc, mrq);
348 return;
349 }
350
351 host->mrq = mrq;
352
353 if (mrq->data)
354 writel(sg_dma_address(mrq->data->sg),
355 host->base + MESON_MX_SDIO_ADDR);
356
357 if (mrq->sbc)
358 meson_mx_mmc_start_cmd(mmc, mrq->sbc);
359 else
360 meson_mx_mmc_start_cmd(mmc, mrq->cmd);
361 }
362
363 static int meson_mx_mmc_card_busy(struct mmc_host *mmc)
364 {
365 struct meson_mx_mmc_host *host = mmc_priv(mmc);
366 u32 irqc = readl(host->base + MESON_MX_SDIO_IRQC);
367
368 return !!(irqc & MESON_MX_SDIO_IRQC_FORCE_DATA_DAT_MASK);
369 }
370
371 static void meson_mx_mmc_read_response(struct mmc_host *mmc,
372 struct mmc_command *cmd)
373 {
374 struct meson_mx_mmc_host *host = mmc_priv(mmc);
375 u32 mult;
376 int i, resp[4];
377
378 mult = readl(host->base + MESON_MX_SDIO_MULT);
379 mult |= MESON_MX_SDIO_MULT_WR_RD_OUT_INDEX;
380 mult &= ~MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK;
381 mult |= FIELD_PREP(MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK, 0);
382 writel(mult, host->base + MESON_MX_SDIO_MULT);
383
384 if (cmd->flags & MMC_RSP_136) {
385 for (i = 0; i <= 3; i++)
386 resp[3 - i] = readl(host->base + MESON_MX_SDIO_ARGU);
387 cmd->resp[0] = (resp[0] << 8) | ((resp[1] >> 24) & 0xff);
388 cmd->resp[1] = (resp[1] << 8) | ((resp[2] >> 24) & 0xff);
389 cmd->resp[2] = (resp[2] << 8) | ((resp[3] >> 24) & 0xff);
390 cmd->resp[3] = (resp[3] << 8);
391 } else if (cmd->flags & MMC_RSP_PRESENT) {
392 cmd->resp[0] = readl(host->base + MESON_MX_SDIO_ARGU);
393 }
394 }
395
396 static irqreturn_t meson_mx_mmc_process_cmd_irq(struct meson_mx_mmc_host *host,
397 u32 irqs, u32 send)
398 {
399 struct mmc_command *cmd = host->cmd;
400
401 /*
402 * NOTE: even though it shouldn't happen we sometimes get command
403 * interrupts twice (at least this is what it looks like). Ideally
404 * we find out why this happens and warn here as soon as it occurs.
405 */
406 if (!cmd)
407 return IRQ_HANDLED;
408
409 cmd->error = 0;
410 meson_mx_mmc_read_response(host->mmc, cmd);
411
412 if (cmd->data) {
413 if (!((irqs & MESON_MX_SDIO_IRQS_DATA_READ_CRC16_OK) ||
414 (irqs & MESON_MX_SDIO_IRQS_DATA_WRITE_CRC16_OK)))
415 cmd->error = -EILSEQ;
416 } else {
417 if (!((irqs & MESON_MX_SDIO_IRQS_RESP_CRC7_OK) ||
418 (send & MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7)))
419 cmd->error = -EILSEQ;
420 }
421
422 return IRQ_WAKE_THREAD;
423 }
424
425 static irqreturn_t meson_mx_mmc_irq(int irq, void *data)
426 {
427 struct meson_mx_mmc_host *host = (void *) data;
428 u32 irqs, send;
429 unsigned long irqflags;
430 irqreturn_t ret;
431
432 spin_lock_irqsave(&host->irq_lock, irqflags);
433
434 irqs = readl(host->base + MESON_MX_SDIO_IRQS);
435 send = readl(host->base + MESON_MX_SDIO_SEND);
436
437 if (irqs & MESON_MX_SDIO_IRQS_CMD_INT)
438 ret = meson_mx_mmc_process_cmd_irq(host, irqs, send);
439 else
440 ret = IRQ_HANDLED;
441
442 /* finally ACK all pending interrupts */
443 writel(irqs, host->base + MESON_MX_SDIO_IRQS);
444
445 spin_unlock_irqrestore(&host->irq_lock, irqflags);
446
447 return ret;
448 }
449
450 static irqreturn_t meson_mx_mmc_irq_thread(int irq, void *irq_data)
451 {
452 struct meson_mx_mmc_host *host = (void *) irq_data;
453 struct mmc_command *cmd = host->cmd, *next_cmd;
454
455 if (WARN_ON(!cmd))
456 return IRQ_HANDLED;
457
458 del_timer_sync(&host->cmd_timeout);
459
460 if (cmd->data) {
461 dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg,
462 cmd->data->sg_len,
463 mmc_get_dma_dir(cmd->data));
464
465 cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks;
466 }
467
468 next_cmd = meson_mx_mmc_get_next_cmd(cmd);
469 if (next_cmd)
470 meson_mx_mmc_start_cmd(host->mmc, next_cmd);
471 else
472 meson_mx_mmc_request_done(host);
473
474 return IRQ_HANDLED;
475 }
476
477 static void meson_mx_mmc_timeout(struct timer_list *t)
478 {
479 struct meson_mx_mmc_host *host = from_timer(host, t, cmd_timeout);
480 unsigned long irqflags;
481 u32 irqc;
482
483 spin_lock_irqsave(&host->irq_lock, irqflags);
484
485 /* disable the CMD interrupt */
486 irqc = readl(host->base + MESON_MX_SDIO_IRQC);
487 irqc &= ~MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN;
488 writel(irqc, host->base + MESON_MX_SDIO_IRQC);
489
490 spin_unlock_irqrestore(&host->irq_lock, irqflags);
491
492 /*
493 * skip the timeout handling if the interrupt handler already processed
494 * the command.
495 */
496 if (!host->cmd)
497 return;
498
499 dev_dbg(mmc_dev(host->mmc),
500 "Timeout on CMD%u (IRQS = 0x%08x, ARGU = 0x%08x)\n",
501 host->cmd->opcode, readl(host->base + MESON_MX_SDIO_IRQS),
502 readl(host->base + MESON_MX_SDIO_ARGU));
503
504 host->cmd->error = -ETIMEDOUT;
505
506 meson_mx_mmc_request_done(host);
507 }
508
509 static struct mmc_host_ops meson_mx_mmc_ops = {
510 .request = meson_mx_mmc_request,
511 .set_ios = meson_mx_mmc_set_ios,
512 .card_busy = meson_mx_mmc_card_busy,
513 .get_cd = mmc_gpio_get_cd,
514 .get_ro = mmc_gpio_get_ro,
515 };
516
517 static struct platform_device *meson_mx_mmc_slot_pdev(struct device *parent)
518 {
519 struct device_node *slot_node;
520 struct platform_device *pdev;
521
522 /*
523 * TODO: the MMC core framework currently does not support
524 * controllers with multiple slots properly. So we only register
525 * the first slot for now
526 */
527 slot_node = of_get_compatible_child(parent->of_node, "mmc-slot");
528 if (!slot_node) {
529 dev_warn(parent, "no 'mmc-slot' sub-node found\n");
530 return ERR_PTR(-ENOENT);
531 }
532
533 pdev = of_platform_device_create(slot_node, NULL, parent);
534 of_node_put(slot_node);
535
536 return pdev;
537 }
538
539 static int meson_mx_mmc_add_host(struct meson_mx_mmc_host *host)
540 {
541 struct mmc_host *mmc = host->mmc;
542 struct device *slot_dev = mmc_dev(mmc);
543 int ret;
544
545 if (of_property_read_u32(slot_dev->of_node, "reg", &host->slot_id)) {
546 dev_err(slot_dev, "missing 'reg' property\n");
547 return -EINVAL;
548 }
549
550 if (host->slot_id >= MESON_MX_SDIO_MAX_SLOTS) {
551 dev_err(slot_dev, "invalid 'reg' property value %d\n",
552 host->slot_id);
553 return -EINVAL;
554 }
555
556 /* Get regulators and the supported OCR mask */
557 ret = mmc_regulator_get_supply(mmc);
558 if (ret)
559 return ret;
560
561 mmc->max_req_size = MESON_MX_SDIO_BOUNCE_REQ_SIZE;
562 mmc->max_seg_size = mmc->max_req_size;
563 mmc->max_blk_count =
564 FIELD_GET(MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK,
565 0xffffffff);
566 mmc->max_blk_size = FIELD_GET(MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK,
567 0xffffffff);
568 mmc->max_blk_size -= (4 * MESON_MX_SDIO_RESPONSE_CRC16_BITS);
569 mmc->max_blk_size /= BITS_PER_BYTE;
570
571 /* Get the min and max supported clock rates */
572 mmc->f_min = clk_round_rate(host->cfg_div_clk, 1);
573 mmc->f_max = clk_round_rate(host->cfg_div_clk,
574 clk_get_rate(host->parent_clk));
575
576 mmc->caps |= MMC_CAP_ERASE | MMC_CAP_CMD23;
577 mmc->ops = &meson_mx_mmc_ops;
578
579 ret = mmc_of_parse(mmc);
580 if (ret)
581 return ret;
582
583 ret = mmc_add_host(mmc);
584 if (ret)
585 return ret;
586
587 return 0;
588 }
589
590 static int meson_mx_mmc_register_clks(struct meson_mx_mmc_host *host)
591 {
592 struct clk_init_data init;
593 const char *clk_div_parent, *clk_fixed_factor_parent;
594
595 clk_fixed_factor_parent = __clk_get_name(host->parent_clk);
596 init.name = devm_kasprintf(host->controller_dev, GFP_KERNEL,
597 "%s#fixed_factor",
598 dev_name(host->controller_dev));
599 init.ops = &clk_fixed_factor_ops;
600 init.flags = 0;
601 init.parent_names = &clk_fixed_factor_parent;
602 init.num_parents = 1;
603 host->fixed_factor.div = 2;
604 host->fixed_factor.mult = 1;
605 host->fixed_factor.hw.init = &init;
606
607 host->fixed_factor_clk = devm_clk_register(host->controller_dev,
608 &host->fixed_factor.hw);
609 if (WARN_ON(IS_ERR(host->fixed_factor_clk)))
610 return PTR_ERR(host->fixed_factor_clk);
611
612 clk_div_parent = __clk_get_name(host->fixed_factor_clk);
613 init.name = devm_kasprintf(host->controller_dev, GFP_KERNEL,
614 "%s#div", dev_name(host->controller_dev));
615 init.ops = &clk_divider_ops;
616 init.flags = CLK_SET_RATE_PARENT;
617 init.parent_names = &clk_div_parent;
618 init.num_parents = 1;
619 host->cfg_div.reg = host->base + MESON_MX_SDIO_CONF;
620 host->cfg_div.shift = MESON_MX_SDIO_CONF_CMD_CLK_DIV_SHIFT;
621 host->cfg_div.width = MESON_MX_SDIO_CONF_CMD_CLK_DIV_WIDTH;
622 host->cfg_div.hw.init = &init;
623 host->cfg_div.flags = CLK_DIVIDER_ALLOW_ZERO;
624
625 host->cfg_div_clk = devm_clk_register(host->controller_dev,
626 &host->cfg_div.hw);
627 if (WARN_ON(IS_ERR(host->cfg_div_clk)))
628 return PTR_ERR(host->cfg_div_clk);
629
630 return 0;
631 }
632
633 static int meson_mx_mmc_probe(struct platform_device *pdev)
634 {
635 struct platform_device *slot_pdev;
636 struct mmc_host *mmc;
637 struct meson_mx_mmc_host *host;
638 struct resource *res;
639 int ret, irq;
640 u32 conf;
641
642 slot_pdev = meson_mx_mmc_slot_pdev(&pdev->dev);
643 if (!slot_pdev)
644 return -ENODEV;
645 else if (IS_ERR(slot_pdev))
646 return PTR_ERR(slot_pdev);
647
648 mmc = mmc_alloc_host(sizeof(*host), &slot_pdev->dev);
649 if (!mmc) {
650 ret = -ENOMEM;
651 goto error_unregister_slot_pdev;
652 }
653
654 host = mmc_priv(mmc);
655 host->mmc = mmc;
656 host->controller_dev = &pdev->dev;
657
658 spin_lock_init(&host->irq_lock);
659 timer_setup(&host->cmd_timeout, meson_mx_mmc_timeout, 0);
660
661 platform_set_drvdata(pdev, host);
662
663 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
664 host->base = devm_ioremap_resource(host->controller_dev, res);
665 if (IS_ERR(host->base)) {
666 ret = PTR_ERR(host->base);
667 goto error_free_mmc;
668 }
669
670 irq = platform_get_irq(pdev, 0);
671 ret = devm_request_threaded_irq(host->controller_dev, irq,
672 meson_mx_mmc_irq,
673 meson_mx_mmc_irq_thread, IRQF_ONESHOT,
674 NULL, host);
675 if (ret)
676 goto error_free_mmc;
677
678 host->core_clk = devm_clk_get(host->controller_dev, "core");
679 if (IS_ERR(host->core_clk)) {
680 ret = PTR_ERR(host->core_clk);
681 goto error_free_mmc;
682 }
683
684 host->parent_clk = devm_clk_get(host->controller_dev, "clkin");
685 if (IS_ERR(host->parent_clk)) {
686 ret = PTR_ERR(host->parent_clk);
687 goto error_free_mmc;
688 }
689
690 ret = meson_mx_mmc_register_clks(host);
691 if (ret)
692 goto error_free_mmc;
693
694 ret = clk_prepare_enable(host->core_clk);
695 if (ret) {
696 dev_err(host->controller_dev, "Failed to enable core clock\n");
697 goto error_free_mmc;
698 }
699
700 ret = clk_prepare_enable(host->cfg_div_clk);
701 if (ret) {
702 dev_err(host->controller_dev, "Failed to enable MMC clock\n");
703 goto error_disable_core_clk;
704 }
705
706 conf = 0;
707 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_CMD_ARGUMENT_BITS_MASK, 39);
708 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_M_ENDIAN_MASK, 0x3);
709 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_WRITE_NWR_MASK, 0x2);
710 conf |= FIELD_PREP(MESON_MX_SDIO_CONF_WRITE_CRC_OK_STATUS_MASK, 0x2);
711 writel(conf, host->base + MESON_MX_SDIO_CONF);
712
713 meson_mx_mmc_soft_reset(host);
714
715 ret = meson_mx_mmc_add_host(host);
716 if (ret)
717 goto error_disable_clks;
718
719 return 0;
720
721 error_disable_clks:
722 clk_disable_unprepare(host->cfg_div_clk);
723 error_disable_core_clk:
724 clk_disable_unprepare(host->core_clk);
725 error_free_mmc:
726 mmc_free_host(mmc);
727 error_unregister_slot_pdev:
728 of_platform_device_destroy(&slot_pdev->dev, NULL);
729 return ret;
730 }
731
732 static int meson_mx_mmc_remove(struct platform_device *pdev)
733 {
734 struct meson_mx_mmc_host *host = platform_get_drvdata(pdev);
735 struct device *slot_dev = mmc_dev(host->mmc);
736
737 del_timer_sync(&host->cmd_timeout);
738
739 mmc_remove_host(host->mmc);
740
741 of_platform_device_destroy(slot_dev, NULL);
742
743 clk_disable_unprepare(host->cfg_div_clk);
744 clk_disable_unprepare(host->core_clk);
745
746 mmc_free_host(host->mmc);
747
748 return 0;
749 }
750
751 static const struct of_device_id meson_mx_mmc_of_match[] = {
752 { .compatible = "amlogic,meson8-sdio", },
753 { .compatible = "amlogic,meson8b-sdio", },
754 { /* sentinel */ }
755 };
756 MODULE_DEVICE_TABLE(of, meson_mx_mmc_of_match);
757
758 static struct platform_driver meson_mx_mmc_driver = {
759 .probe = meson_mx_mmc_probe,
760 .remove = meson_mx_mmc_remove,
761 .driver = {
762 .name = "meson-mx-sdio",
763 .of_match_table = of_match_ptr(meson_mx_mmc_of_match),
764 },
765 };
766
767 module_platform_driver(meson_mx_mmc_driver);
768
769 MODULE_DESCRIPTION("Meson6, Meson8 and Meson8b SDIO/MMC Host Driver");
770 MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
771 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
772 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support