1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Amlogic SD/eMMC driver for the GX/S905 family SoCs
4 *
5 * Copyright (c) 2016 BayLibre, SAS.
6 * Author: Kevin Hilman <khilman@baylibre.com>
7 */
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/delay.h>
12 #include <linux/device.h>
13 #include <linux/iopoll.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/ioport.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/mmc/host.h>
19 #include <linux/mmc/mmc.h>
20 #include <linux/mmc/sdio.h>
21 #include <linux/mmc/slot-gpio.h>
22 #include <linux/io.h>
23 #include <linux/clk.h>
24 #include <linux/clk-provider.h>
25 #include <linux/regulator/consumer.h>
26 #include <linux/reset.h>
27 #include <linux/interrupt.h>
28 #include <linux/bitfield.h>
29 #include <linux/pinctrl/consumer.h>
30
31 #define DRIVER_NAME "meson-gx-mmc"
32
33 #define SD_EMMC_CLOCK 0x0
34 #define CLK_DIV_MASK GENMASK(5, 0)
35 #define CLK_SRC_MASK GENMASK(7, 6)
36 #define CLK_CORE_PHASE_MASK GENMASK(9, 8)
37 #define CLK_TX_PHASE_MASK GENMASK(11, 10)
38 #define CLK_RX_PHASE_MASK GENMASK(13, 12)
39 #define CLK_PHASE_0 0
40 #define CLK_PHASE_180 2
41 #define CLK_V2_TX_DELAY_MASK GENMASK(19, 16)
42 #define CLK_V2_RX_DELAY_MASK GENMASK(23, 20)
43 #define CLK_V2_ALWAYS_ON BIT(24)
44 #define CLK_V2_IRQ_SDIO_SLEEP BIT(25)
45
46 #define CLK_V3_TX_DELAY_MASK GENMASK(21, 16)
47 #define CLK_V3_RX_DELAY_MASK GENMASK(27, 22)
48 #define CLK_V3_ALWAYS_ON BIT(28)
49 #define CLK_V3_IRQ_SDIO_SLEEP BIT(29)
50
51 #define CLK_TX_DELAY_MASK(h) (h->data->tx_delay_mask)
52 #define CLK_RX_DELAY_MASK(h) (h->data->rx_delay_mask)
53 #define CLK_ALWAYS_ON(h) (h->data->always_on)
54 #define CLK_IRQ_SDIO_SLEEP(h) (h->data->irq_sdio_sleep)
55
56 #define SD_EMMC_DELAY 0x4
57 #define SD_EMMC_ADJUST 0x8
58 #define ADJUST_ADJ_DELAY_MASK GENMASK(21, 16)
59 #define ADJUST_DS_EN BIT(15)
60 #define ADJUST_ADJ_EN BIT(13)
61
62 #define SD_EMMC_DELAY1 0x4
63 #define SD_EMMC_DELAY2 0x8
64 #define SD_EMMC_V3_ADJUST 0xc
65
66 #define SD_EMMC_CALOUT 0x10
67 #define SD_EMMC_START 0x40
68 #define START_DESC_INIT BIT(0)
69 #define START_DESC_BUSY BIT(1)
70 #define START_DESC_ADDR_MASK GENMASK(31, 2)
71
72 #define SD_EMMC_CFG 0x44
73 #define CFG_BUS_WIDTH_MASK GENMASK(1, 0)
74 #define CFG_BUS_WIDTH_1 0x0
75 #define CFG_BUS_WIDTH_4 0x1
76 #define CFG_BUS_WIDTH_8 0x2
77 #define CFG_DDR BIT(2)
78 #define CFG_BLK_LEN_MASK GENMASK(7, 4)
79 #define CFG_RESP_TIMEOUT_MASK GENMASK(11, 8)
80 #define CFG_RC_CC_MASK GENMASK(15, 12)
81 #define CFG_STOP_CLOCK BIT(22)
82 #define CFG_CLK_ALWAYS_ON BIT(18)
83 #define CFG_CHK_DS BIT(20)
84 #define CFG_AUTO_CLK BIT(23)
85 #define CFG_ERR_ABORT BIT(27)
86
87 #define SD_EMMC_STATUS 0x48
88 #define STATUS_BUSY BIT(31)
89 #define STATUS_DESC_BUSY BIT(30)
90 #define STATUS_DATI GENMASK(23, 16)
91
92 #define SD_EMMC_IRQ_EN 0x4c
93 #define IRQ_RXD_ERR_MASK GENMASK(7, 0)
94 #define IRQ_TXD_ERR BIT(8)
95 #define IRQ_DESC_ERR BIT(9)
96 #define IRQ_RESP_ERR BIT(10)
97 #define IRQ_CRC_ERR \
98 (IRQ_RXD_ERR_MASK | IRQ_TXD_ERR | IRQ_DESC_ERR | IRQ_RESP_ERR)
99 #define IRQ_RESP_TIMEOUT BIT(11)
100 #define IRQ_DESC_TIMEOUT BIT(12)
101 #define IRQ_TIMEOUTS \
102 (IRQ_RESP_TIMEOUT | IRQ_DESC_TIMEOUT)
103 #define IRQ_END_OF_CHAIN BIT(13)
104 #define IRQ_RESP_STATUS BIT(14)
105 #define IRQ_SDIO BIT(15)
106 #define IRQ_EN_MASK \
107 (IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN)
108
109 #define SD_EMMC_CMD_CFG 0x50
110 #define SD_EMMC_CMD_ARG 0x54
111 #define SD_EMMC_CMD_DAT 0x58
112 #define SD_EMMC_CMD_RSP 0x5c
113 #define SD_EMMC_CMD_RSP1 0x60
114 #define SD_EMMC_CMD_RSP2 0x64
115 #define SD_EMMC_CMD_RSP3 0x68
116
117 #define SD_EMMC_RXD 0x94
118 #define SD_EMMC_TXD 0x94
119 #define SD_EMMC_LAST_REG SD_EMMC_TXD
120
121 #define SD_EMMC_SRAM_DATA_BUF_LEN 1536
122 #define SD_EMMC_SRAM_DATA_BUF_OFF 0x200
123
124 #define SD_EMMC_CFG_BLK_SIZE 512 /* internal buffer max: 512 bytes */
125 #define SD_EMMC_CFG_RESP_TIMEOUT 256 /* in clock cycles */
126 #define SD_EMMC_CMD_TIMEOUT 1024 /* in ms */
127 #define SD_EMMC_CMD_TIMEOUT_DATA 4096 /* in ms */
128 #define SD_EMMC_CFG_CMD_GAP 16 /* in clock cycles */
129 #define SD_EMMC_DESC_BUF_LEN PAGE_SIZE
130
131 #define SD_EMMC_PRE_REQ_DONE BIT(0)
132 #define SD_EMMC_DESC_CHAIN_MODE BIT(1)
133
134 #define MUX_CLK_NUM_PARENTS 2
135
136 struct meson_mmc_data {
137 unsigned int tx_delay_mask;
138 unsigned int rx_delay_mask;
139 unsigned int always_on;
140 unsigned int adjust;
141 unsigned int irq_sdio_sleep;
142 };
143
144 struct sd_emmc_desc {
145 u32 cmd_cfg;
146 u32 cmd_arg;
147 u32 cmd_data;
148 u32 cmd_resp;
149 };
150
151 struct meson_host {
152 struct device *dev;
153 const struct meson_mmc_data *data;
154 struct mmc_host *mmc;
155 struct mmc_command *cmd;
156
157 void __iomem *regs;
158 struct clk *mux_clk;
159 struct clk *mmc_clk;
160 unsigned long req_rate;
161 bool ddr;
162
163 bool dram_access_quirk;
164
165 struct pinctrl *pinctrl;
166 struct pinctrl_state *pins_clk_gate;
167
168 unsigned int bounce_buf_size;
169 void *bounce_buf;
170 void __iomem *bounce_iomem_buf;
171 dma_addr_t bounce_dma_addr;
172 struct sd_emmc_desc *descs;
173 dma_addr_t descs_dma_addr;
174
175 int irq;
176
177 bool needs_pre_post_req;
178
179 spinlock_t lock;
180 };
181
182 #define CMD_CFG_LENGTH_MASK GENMASK(8, 0)
183 #define CMD_CFG_BLOCK_MODE BIT(9)
184 #define CMD_CFG_R1B BIT(10)
185 #define CMD_CFG_END_OF_CHAIN BIT(11)
186 #define CMD_CFG_TIMEOUT_MASK GENMASK(15, 12)
187 #define CMD_CFG_NO_RESP BIT(16)
188 #define CMD_CFG_NO_CMD BIT(17)
189 #define CMD_CFG_DATA_IO BIT(18)
190 #define CMD_CFG_DATA_WR BIT(19)
191 #define CMD_CFG_RESP_NOCRC BIT(20)
192 #define CMD_CFG_RESP_128 BIT(21)
193 #define CMD_CFG_RESP_NUM BIT(22)
194 #define CMD_CFG_DATA_NUM BIT(23)
195 #define CMD_CFG_CMD_INDEX_MASK GENMASK(29, 24)
196 #define CMD_CFG_ERROR BIT(30)
197 #define CMD_CFG_OWNER BIT(31)
198
199 #define CMD_DATA_MASK GENMASK(31, 2)
200 #define CMD_DATA_BIG_ENDIAN BIT(1)
201 #define CMD_DATA_SRAM BIT(0)
202 #define CMD_RESP_MASK GENMASK(31, 1)
203 #define CMD_RESP_SRAM BIT(0)
204
meson_mmc_get_timeout_msecs(struct mmc_data * data)205 static unsigned int meson_mmc_get_timeout_msecs(struct mmc_data *data)
206 {
207 unsigned int timeout = data->timeout_ns / NSEC_PER_MSEC;
208
209 if (!timeout)
210 return SD_EMMC_CMD_TIMEOUT_DATA;
211
212 timeout = roundup_pow_of_two(timeout);
213
214 return min(timeout, 32768U); /* max. 2^15 ms */
215 }
216
meson_mmc_get_next_command(struct mmc_command * cmd)217 static struct mmc_command *meson_mmc_get_next_command(struct mmc_command *cmd)
218 {
219 if (cmd->opcode == MMC_SET_BLOCK_COUNT && !cmd->error)
220 return cmd->mrq->cmd;
221 else if (mmc_op_multi(cmd->opcode) &&
222 (!cmd->mrq->sbc || cmd->error || cmd->data->error))
223 return cmd->mrq->stop;
224 else
225 return NULL;
226 }
227
meson_mmc_get_transfer_mode(struct mmc_host * mmc,struct mmc_request * mrq)228 static void meson_mmc_get_transfer_mode(struct mmc_host *mmc,
229 struct mmc_request *mrq)
230 {
231 struct meson_host *host = mmc_priv(mmc);
232 struct mmc_data *data = mrq->data;
233 struct scatterlist *sg;
234 int i;
235
236 /*
237 * When Controller DMA cannot directly access DDR memory, disable
238 * support for Chain Mode to directly use the internal SRAM using
239 * the bounce buffer mode.
240 */
241 if (host->dram_access_quirk)
242 return;
243
244 /* SD_IO_RW_EXTENDED (CMD53) can also use block mode under the hood */
245 if (data->blocks > 1 || mrq->cmd->opcode == SD_IO_RW_EXTENDED) {
246 /*
247 * In block mode DMA descriptor format, "length" field indicates
248 * number of blocks and there is no way to pass DMA size that
249 * is not multiple of SDIO block size, making it impossible to
250 * tie more than one memory buffer with single SDIO block.
251 * Block mode sg buffer size should be aligned with SDIO block
252 * size, otherwise chain mode could not be used.
253 */
254 for_each_sg(data->sg, sg, data->sg_len, i) {
255 if (sg->length % data->blksz) {
256 dev_warn_once(mmc_dev(mmc),
257 "unaligned sg len %u blksize %u, disabling descriptor DMA for transfer\n",
258 sg->length, data->blksz);
259 return;
260 }
261 }
262 }
263
264 for_each_sg(data->sg, sg, data->sg_len, i) {
265 /* check for 8 byte alignment */
266 if (sg->offset % 8) {
267 dev_warn_once(mmc_dev(mmc),
268 "unaligned sg offset %u, disabling descriptor DMA for transfer\n",
269 sg->offset);
270 return;
271 }
272 }
273
274 data->host_cookie |= SD_EMMC_DESC_CHAIN_MODE;
275 }
276
meson_mmc_desc_chain_mode(const struct mmc_data * data)277 static inline bool meson_mmc_desc_chain_mode(const struct mmc_data *data)
278 {
279 return data->host_cookie & SD_EMMC_DESC_CHAIN_MODE;
280 }
281
meson_mmc_bounce_buf_read(const struct mmc_data * data)282 static inline bool meson_mmc_bounce_buf_read(const struct mmc_data *data)
283 {
284 return data && data->flags & MMC_DATA_READ &&
285 !meson_mmc_desc_chain_mode(data);
286 }
287
meson_mmc_pre_req(struct mmc_host * mmc,struct mmc_request * mrq)288 static void meson_mmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
289 {
290 struct mmc_data *data = mrq->data;
291
292 if (!data)
293 return;
294
295 meson_mmc_get_transfer_mode(mmc, mrq);
296 data->host_cookie |= SD_EMMC_PRE_REQ_DONE;
297
298 if (!meson_mmc_desc_chain_mode(data))
299 return;
300
301 data->sg_count = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
302 mmc_get_dma_dir(data));
303 if (!data->sg_count)
304 dev_err(mmc_dev(mmc), "dma_map_sg failed");
305 }
306
meson_mmc_post_req(struct mmc_host * mmc,struct mmc_request * mrq,int err)307 static void meson_mmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
308 int err)
309 {
310 struct mmc_data *data = mrq->data;
311
312 if (data && meson_mmc_desc_chain_mode(data) && data->sg_count)
313 dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len,
314 mmc_get_dma_dir(data));
315 }
316
317 /*
318 * Gating the clock on this controller is tricky. It seems the mmc clock
319 * is also used by the controller. It may crash during some operation if the
320 * clock is stopped. The safest thing to do, whenever possible, is to keep
321 * clock running at stop it at the pad using the pinmux.
322 */
meson_mmc_clk_gate(struct meson_host * host)323 static void meson_mmc_clk_gate(struct meson_host *host)
324 {
325 u32 cfg;
326
327 if (host->pins_clk_gate) {
328 pinctrl_select_state(host->pinctrl, host->pins_clk_gate);
329 } else {
330 /*
331 * If the pinmux is not provided - default to the classic and
332 * unsafe method
333 */
334 cfg = readl(host->regs + SD_EMMC_CFG);
335 cfg |= CFG_STOP_CLOCK;
336 writel(cfg, host->regs + SD_EMMC_CFG);
337 }
338 }
339
meson_mmc_clk_ungate(struct meson_host * host)340 static void meson_mmc_clk_ungate(struct meson_host *host)
341 {
342 u32 cfg;
343
344 if (host->pins_clk_gate)
345 pinctrl_select_default_state(host->dev);
346
347 /* Make sure the clock is not stopped in the controller */
348 cfg = readl(host->regs + SD_EMMC_CFG);
349 cfg &= ~CFG_STOP_CLOCK;
350 writel(cfg, host->regs + SD_EMMC_CFG);
351 }
352
meson_mmc_clk_set(struct meson_host * host,unsigned long rate,bool ddr)353 static int meson_mmc_clk_set(struct meson_host *host, unsigned long rate,
354 bool ddr)
355 {
356 struct mmc_host *mmc = host->mmc;
357 int ret;
358 u32 cfg;
359
360 /* Same request - bail-out */
361 if (host->ddr == ddr && host->req_rate == rate)
362 return 0;
363
364 /* stop clock */
365 meson_mmc_clk_gate(host);
366 host->req_rate = 0;
367 mmc->actual_clock = 0;
368
369 /* return with clock being stopped */
370 if (!rate)
371 return 0;
372
373 /* Stop the clock during rate change to avoid glitches */
374 cfg = readl(host->regs + SD_EMMC_CFG);
375 cfg |= CFG_STOP_CLOCK;
376 writel(cfg, host->regs + SD_EMMC_CFG);
377
378 if (ddr) {
379 /* DDR modes require higher module clock */
380 rate <<= 1;
381 cfg |= CFG_DDR;
382 } else {
383 cfg &= ~CFG_DDR;
384 }
385 writel(cfg, host->regs + SD_EMMC_CFG);
386 host->ddr = ddr;
387
388 ret = clk_set_rate(host->mmc_clk, rate);
389 if (ret) {
390 dev_err(host->dev, "Unable to set cfg_div_clk to %lu. ret=%d\n",
391 rate, ret);
392 return ret;
393 }
394
395 host->req_rate = rate;
396 mmc->actual_clock = clk_get_rate(host->mmc_clk);
397
398 /* We should report the real output frequency of the controller */
399 if (ddr) {
400 host->req_rate >>= 1;
401 mmc->actual_clock >>= 1;
402 }
403
404 dev_dbg(host->dev, "clk rate: %u Hz\n", mmc->actual_clock);
405 if (rate != mmc->actual_clock)
406 dev_dbg(host->dev, "requested rate was %lu\n", rate);
407
408 /* (re)start clock */
409 meson_mmc_clk_ungate(host);
410
411 return 0;
412 }
413
414 /*
415 * The SD/eMMC IP block has an internal mux and divider used for
416 * generating the MMC clock. Use the clock framework to create and
417 * manage these clocks.
418 */
meson_mmc_clk_init(struct meson_host * host)419 static int meson_mmc_clk_init(struct meson_host *host)
420 {
421 struct clk_init_data init;
422 struct clk_mux *mux;
423 struct clk_divider *div;
424 char clk_name[32];
425 int i, ret = 0;
426 const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
427 const char *clk_parent[1];
428 u32 clk_reg;
429
430 /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
431 clk_reg = CLK_ALWAYS_ON(host);
432 clk_reg |= CLK_DIV_MASK;
433 clk_reg |= FIELD_PREP(CLK_CORE_PHASE_MASK, CLK_PHASE_180);
434 clk_reg |= FIELD_PREP(CLK_TX_PHASE_MASK, CLK_PHASE_0);
435 clk_reg |= FIELD_PREP(CLK_RX_PHASE_MASK, CLK_PHASE_0);
436 if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
437 clk_reg |= CLK_IRQ_SDIO_SLEEP(host);
438 writel(clk_reg, host->regs + SD_EMMC_CLOCK);
439
440 /* get the mux parents */
441 for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
442 struct clk *clk;
443 char name[16];
444
445 snprintf(name, sizeof(name), "clkin%d", i);
446 clk = devm_clk_get(host->dev, name);
447 if (IS_ERR(clk))
448 return dev_err_probe(host->dev, PTR_ERR(clk),
449 "Missing clock %s\n", name);
450
451 mux_parent_names[i] = __clk_get_name(clk);
452 }
453
454 /* create the mux */
455 mux = devm_kzalloc(host->dev, sizeof(*mux), GFP_KERNEL);
456 if (!mux)
457 return -ENOMEM;
458
459 snprintf(clk_name, sizeof(clk_name), "%s#mux", dev_name(host->dev));
460 init.name = clk_name;
461 init.ops = &clk_mux_ops;
462 init.flags = 0;
463 init.parent_names = mux_parent_names;
464 init.num_parents = MUX_CLK_NUM_PARENTS;
465
466 mux->reg = host->regs + SD_EMMC_CLOCK;
467 mux->shift = __ffs(CLK_SRC_MASK);
468 mux->mask = CLK_SRC_MASK >> mux->shift;
469 mux->hw.init = &init;
470
471 host->mux_clk = devm_clk_register(host->dev, &mux->hw);
472 if (WARN_ON(IS_ERR(host->mux_clk)))
473 return PTR_ERR(host->mux_clk);
474
475 /* create the divider */
476 div = devm_kzalloc(host->dev, sizeof(*div), GFP_KERNEL);
477 if (!div)
478 return -ENOMEM;
479
480 snprintf(clk_name, sizeof(clk_name), "%s#div", dev_name(host->dev));
481 init.name = clk_name;
482 init.ops = &clk_divider_ops;
483 init.flags = CLK_SET_RATE_PARENT;
484 clk_parent[0] = __clk_get_name(host->mux_clk);
485 init.parent_names = clk_parent;
486 init.num_parents = 1;
487
488 div->reg = host->regs + SD_EMMC_CLOCK;
489 div->shift = __ffs(CLK_DIV_MASK);
490 div->width = __builtin_popcountl(CLK_DIV_MASK);
491 div->hw.init = &init;
492 div->flags = CLK_DIVIDER_ONE_BASED;
493
494 host->mmc_clk = devm_clk_register(host->dev, &div->hw);
495 if (WARN_ON(IS_ERR(host->mmc_clk)))
496 return PTR_ERR(host->mmc_clk);
497
498 /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
499 host->mmc->f_min = clk_round_rate(host->mmc_clk, 400000);
500 ret = clk_set_rate(host->mmc_clk, host->mmc->f_min);
501 if (ret)
502 return ret;
503
504 return clk_prepare_enable(host->mmc_clk);
505 }
506
meson_mmc_disable_resampling(struct meson_host * host)507 static void meson_mmc_disable_resampling(struct meson_host *host)
508 {
509 unsigned int val = readl(host->regs + host->data->adjust);
510
511 val &= ~ADJUST_ADJ_EN;
512 writel(val, host->regs + host->data->adjust);
513 }
514
meson_mmc_reset_resampling(struct meson_host * host)515 static void meson_mmc_reset_resampling(struct meson_host *host)
516 {
517 unsigned int val;
518
519 meson_mmc_disable_resampling(host);
520
521 val = readl(host->regs + host->data->adjust);
522 val &= ~ADJUST_ADJ_DELAY_MASK;
523 writel(val, host->regs + host->data->adjust);
524 }
525
meson_mmc_resampling_tuning(struct mmc_host * mmc,u32 opcode)526 static int meson_mmc_resampling_tuning(struct mmc_host *mmc, u32 opcode)
527 {
528 struct meson_host *host = mmc_priv(mmc);
529 unsigned int val, dly, max_dly, i;
530 int ret;
531
532 /* Resampling is done using the source clock */
533 max_dly = DIV_ROUND_UP(clk_get_rate(host->mux_clk),
534 clk_get_rate(host->mmc_clk));
535
536 val = readl(host->regs + host->data->adjust);
537 val |= ADJUST_ADJ_EN;
538 writel(val, host->regs + host->data->adjust);
539
540 if (mmc_doing_retune(mmc))
541 dly = FIELD_GET(ADJUST_ADJ_DELAY_MASK, val) + 1;
542 else
543 dly = 0;
544
545 for (i = 0; i < max_dly; i++) {
546 val &= ~ADJUST_ADJ_DELAY_MASK;
547 val |= FIELD_PREP(ADJUST_ADJ_DELAY_MASK, (dly + i) % max_dly);
548 writel(val, host->regs + host->data->adjust);
549
550 ret = mmc_send_tuning(mmc, opcode, NULL);
551 if (!ret) {
552 dev_dbg(mmc_dev(mmc), "resampling delay: %u\n",
553 (dly + i) % max_dly);
554 return 0;
555 }
556 }
557
558 meson_mmc_reset_resampling(host);
559 return -EIO;
560 }
561
meson_mmc_prepare_ios_clock(struct meson_host * host,struct mmc_ios * ios)562 static int meson_mmc_prepare_ios_clock(struct meson_host *host,
563 struct mmc_ios *ios)
564 {
565 bool ddr;
566
567 switch (ios->timing) {
568 case MMC_TIMING_MMC_DDR52:
569 case MMC_TIMING_UHS_DDR50:
570 ddr = true;
571 break;
572
573 default:
574 ddr = false;
575 break;
576 }
577
578 return meson_mmc_clk_set(host, ios->clock, ddr);
579 }
580
meson_mmc_check_resampling(struct meson_host * host,struct mmc_ios * ios)581 static void meson_mmc_check_resampling(struct meson_host *host,
582 struct mmc_ios *ios)
583 {
584 switch (ios->timing) {
585 case MMC_TIMING_LEGACY:
586 case MMC_TIMING_MMC_HS:
587 case MMC_TIMING_SD_HS:
588 case MMC_TIMING_MMC_DDR52:
589 meson_mmc_disable_resampling(host);
590 break;
591 }
592 }
593
meson_mmc_set_ios(struct mmc_host * mmc,struct mmc_ios * ios)594 static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
595 {
596 struct meson_host *host = mmc_priv(mmc);
597 u32 bus_width, val;
598 int err;
599
600 /*
601 * GPIO regulator, only controls switching between 1v8 and
602 * 3v3, doesn't support MMC_POWER_OFF, MMC_POWER_ON.
603 */
604 switch (ios->power_mode) {
605 case MMC_POWER_OFF:
606 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
607 mmc_regulator_disable_vqmmc(mmc);
608
609 break;
610
611 case MMC_POWER_UP:
612 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
613
614 break;
615
616 case MMC_POWER_ON:
617 mmc_regulator_enable_vqmmc(mmc);
618
619 break;
620 }
621
622 /* Bus width */
623 switch (ios->bus_width) {
624 case MMC_BUS_WIDTH_1:
625 bus_width = CFG_BUS_WIDTH_1;
626 break;
627 case MMC_BUS_WIDTH_4:
628 bus_width = CFG_BUS_WIDTH_4;
629 break;
630 case MMC_BUS_WIDTH_8:
631 bus_width = CFG_BUS_WIDTH_8;
632 break;
633 default:
634 dev_err(host->dev, "Invalid ios->bus_width: %u. Setting to 4.\n",
635 ios->bus_width);
636 bus_width = CFG_BUS_WIDTH_4;
637 }
638
639 val = readl(host->regs + SD_EMMC_CFG);
640 val &= ~CFG_BUS_WIDTH_MASK;
641 val |= FIELD_PREP(CFG_BUS_WIDTH_MASK, bus_width);
642 writel(val, host->regs + SD_EMMC_CFG);
643
644 meson_mmc_check_resampling(host, ios);
645 err = meson_mmc_prepare_ios_clock(host, ios);
646 if (err)
647 dev_err(host->dev, "Failed to set clock: %d\n,", err);
648
649 dev_dbg(host->dev, "SD_EMMC_CFG: 0x%08x\n", val);
650 }
651
meson_mmc_request_done(struct mmc_host * mmc,struct mmc_request * mrq)652 static void meson_mmc_request_done(struct mmc_host *mmc,
653 struct mmc_request *mrq)
654 {
655 struct meson_host *host = mmc_priv(mmc);
656
657 host->cmd = NULL;
658 if (host->needs_pre_post_req)
659 meson_mmc_post_req(mmc, mrq, 0);
660 mmc_request_done(host->mmc, mrq);
661 }
662
meson_mmc_set_blksz(struct mmc_host * mmc,unsigned int blksz)663 static void meson_mmc_set_blksz(struct mmc_host *mmc, unsigned int blksz)
664 {
665 struct meson_host *host = mmc_priv(mmc);
666 u32 cfg, blksz_old;
667
668 cfg = readl(host->regs + SD_EMMC_CFG);
669 blksz_old = FIELD_GET(CFG_BLK_LEN_MASK, cfg);
670
671 if (!is_power_of_2(blksz))
672 dev_err(host->dev, "blksz %u is not a power of 2\n", blksz);
673
674 blksz = ilog2(blksz);
675
676 /* check if block-size matches, if not update */
677 if (blksz == blksz_old)
678 return;
679
680 dev_dbg(host->dev, "%s: update blk_len %d -> %d\n", __func__,
681 blksz_old, blksz);
682
683 cfg &= ~CFG_BLK_LEN_MASK;
684 cfg |= FIELD_PREP(CFG_BLK_LEN_MASK, blksz);
685 writel(cfg, host->regs + SD_EMMC_CFG);
686 }
687
meson_mmc_set_response_bits(struct mmc_command * cmd,u32 * cmd_cfg)688 static void meson_mmc_set_response_bits(struct mmc_command *cmd, u32 *cmd_cfg)
689 {
690 if (cmd->flags & MMC_RSP_PRESENT) {
691 if (cmd->flags & MMC_RSP_136)
692 *cmd_cfg |= CMD_CFG_RESP_128;
693 *cmd_cfg |= CMD_CFG_RESP_NUM;
694
695 if (!(cmd->flags & MMC_RSP_CRC))
696 *cmd_cfg |= CMD_CFG_RESP_NOCRC;
697
698 if (cmd->flags & MMC_RSP_BUSY)
699 *cmd_cfg |= CMD_CFG_R1B;
700 } else {
701 *cmd_cfg |= CMD_CFG_NO_RESP;
702 }
703 }
704
meson_mmc_desc_chain_transfer(struct mmc_host * mmc,u32 cmd_cfg)705 static void meson_mmc_desc_chain_transfer(struct mmc_host *mmc, u32 cmd_cfg)
706 {
707 struct meson_host *host = mmc_priv(mmc);
708 struct sd_emmc_desc *desc = host->descs;
709 struct mmc_data *data = host->cmd->data;
710 struct scatterlist *sg;
711 u32 start;
712 int i;
713
714 if (data->flags & MMC_DATA_WRITE)
715 cmd_cfg |= CMD_CFG_DATA_WR;
716
717 if (data->blocks > 1) {
718 cmd_cfg |= CMD_CFG_BLOCK_MODE;
719 meson_mmc_set_blksz(mmc, data->blksz);
720 }
721
722 for_each_sg(data->sg, sg, data->sg_count, i) {
723 unsigned int len = sg_dma_len(sg);
724
725 if (data->blocks > 1)
726 len /= data->blksz;
727
728 desc[i].cmd_cfg = cmd_cfg;
729 desc[i].cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK, len);
730 if (i > 0)
731 desc[i].cmd_cfg |= CMD_CFG_NO_CMD;
732 desc[i].cmd_arg = host->cmd->arg;
733 desc[i].cmd_resp = 0;
734 desc[i].cmd_data = sg_dma_address(sg);
735 }
736 desc[data->sg_count - 1].cmd_cfg |= CMD_CFG_END_OF_CHAIN;
737
738 dma_wmb(); /* ensure descriptor is written before kicked */
739 start = host->descs_dma_addr | START_DESC_BUSY;
740 writel(start, host->regs + SD_EMMC_START);
741 }
742
743 /* local sg copy for dram_access_quirk */
meson_mmc_copy_buffer(struct meson_host * host,struct mmc_data * data,size_t buflen,bool to_buffer)744 static void meson_mmc_copy_buffer(struct meson_host *host, struct mmc_data *data,
745 size_t buflen, bool to_buffer)
746 {
747 unsigned int sg_flags = SG_MITER_ATOMIC;
748 struct scatterlist *sgl = data->sg;
749 unsigned int nents = data->sg_len;
750 struct sg_mapping_iter miter;
751 unsigned int offset = 0;
752
753 if (to_buffer)
754 sg_flags |= SG_MITER_FROM_SG;
755 else
756 sg_flags |= SG_MITER_TO_SG;
757
758 sg_miter_start(&miter, sgl, nents, sg_flags);
759
760 while ((offset < buflen) && sg_miter_next(&miter)) {
761 unsigned int buf_offset = 0;
762 unsigned int len, left;
763 u32 *buf = miter.addr;
764
765 len = min(miter.length, buflen - offset);
766 left = len;
767
768 if (to_buffer) {
769 do {
770 writel(*buf++, host->bounce_iomem_buf + offset + buf_offset);
771
772 buf_offset += 4;
773 left -= 4;
774 } while (left);
775 } else {
776 do {
777 *buf++ = readl(host->bounce_iomem_buf + offset + buf_offset);
778
779 buf_offset += 4;
780 left -= 4;
781 } while (left);
782 }
783
784 offset += len;
785 }
786
787 sg_miter_stop(&miter);
788 }
789
meson_mmc_start_cmd(struct mmc_host * mmc,struct mmc_command * cmd)790 static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
791 {
792 struct meson_host *host = mmc_priv(mmc);
793 struct mmc_data *data = cmd->data;
794 u32 cmd_cfg = 0, cmd_data = 0;
795 unsigned int xfer_bytes = 0;
796
797 /* Setup descriptors */
798 dma_rmb();
799
800 host->cmd = cmd;
801
802 cmd_cfg |= FIELD_PREP(CMD_CFG_CMD_INDEX_MASK, cmd->opcode);
803 cmd_cfg |= CMD_CFG_OWNER; /* owned by CPU */
804
805 meson_mmc_set_response_bits(cmd, &cmd_cfg);
806
807 /* data? */
808 if (data) {
809 data->bytes_xfered = 0;
810 cmd_cfg |= CMD_CFG_DATA_IO;
811 cmd_cfg |= FIELD_PREP(CMD_CFG_TIMEOUT_MASK,
812 ilog2(meson_mmc_get_timeout_msecs(data)));
813
814 if (meson_mmc_desc_chain_mode(data)) {
815 meson_mmc_desc_chain_transfer(mmc, cmd_cfg);
816 return;
817 }
818
819 if (data->blocks > 1) {
820 cmd_cfg |= CMD_CFG_BLOCK_MODE;
821 cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK,
822 data->blocks);
823 meson_mmc_set_blksz(mmc, data->blksz);
824 } else {
825 cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK, data->blksz);
826 }
827
828 xfer_bytes = data->blksz * data->blocks;
829 if (data->flags & MMC_DATA_WRITE) {
830 cmd_cfg |= CMD_CFG_DATA_WR;
831 WARN_ON(xfer_bytes > host->bounce_buf_size);
832 if (host->dram_access_quirk)
833 meson_mmc_copy_buffer(host, data, xfer_bytes, true);
834 else
835 sg_copy_to_buffer(data->sg, data->sg_len,
836 host->bounce_buf, xfer_bytes);
837 dma_wmb();
838 }
839
840 cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
841 } else {
842 cmd_cfg |= FIELD_PREP(CMD_CFG_TIMEOUT_MASK,
843 ilog2(SD_EMMC_CMD_TIMEOUT));
844 }
845
846 /* Last descriptor */
847 cmd_cfg |= CMD_CFG_END_OF_CHAIN;
848 writel(cmd_cfg, host->regs + SD_EMMC_CMD_CFG);
849 writel(cmd_data, host->regs + SD_EMMC_CMD_DAT);
850 writel(0, host->regs + SD_EMMC_CMD_RSP);
851 wmb(); /* ensure descriptor is written before kicked */
852 writel(cmd->arg, host->regs + SD_EMMC_CMD_ARG);
853 }
854
meson_mmc_validate_dram_access(struct mmc_host * mmc,struct mmc_data * data)855 static int meson_mmc_validate_dram_access(struct mmc_host *mmc, struct mmc_data *data)
856 {
857 struct scatterlist *sg;
858 int i;
859
860 /* Reject request if any element offset or size is not 32bit aligned */
861 for_each_sg(data->sg, sg, data->sg_len, i) {
862 if (!IS_ALIGNED(sg->offset, sizeof(u32)) ||
863 !IS_ALIGNED(sg->length, sizeof(u32))) {
864 dev_err(mmc_dev(mmc), "unaligned sg offset %u len %u\n",
865 data->sg->offset, data->sg->length);
866 return -EINVAL;
867 }
868 }
869
870 return 0;
871 }
872
meson_mmc_request(struct mmc_host * mmc,struct mmc_request * mrq)873 static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
874 {
875 struct meson_host *host = mmc_priv(mmc);
876 host->needs_pre_post_req = mrq->data &&
877 !(mrq->data->host_cookie & SD_EMMC_PRE_REQ_DONE);
878
879 /*
880 * The memory at the end of the controller used as bounce buffer for
881 * the dram_access_quirk only accepts 32bit read/write access,
882 * check the aligment and length of the data before starting the request.
883 */
884 if (host->dram_access_quirk && mrq->data) {
885 mrq->cmd->error = meson_mmc_validate_dram_access(mmc, mrq->data);
886 if (mrq->cmd->error) {
887 mmc_request_done(mmc, mrq);
888 return;
889 }
890 }
891
892 if (host->needs_pre_post_req) {
893 meson_mmc_get_transfer_mode(mmc, mrq);
894 if (!meson_mmc_desc_chain_mode(mrq->data))
895 host->needs_pre_post_req = false;
896 }
897
898 if (host->needs_pre_post_req)
899 meson_mmc_pre_req(mmc, mrq);
900
901 /* Stop execution */
902 writel(0, host->regs + SD_EMMC_START);
903
904 meson_mmc_start_cmd(mmc, mrq->sbc ?: mrq->cmd);
905 }
906
meson_mmc_read_resp(struct mmc_host * mmc,struct mmc_command * cmd)907 static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
908 {
909 struct meson_host *host = mmc_priv(mmc);
910
911 if (cmd->flags & MMC_RSP_136) {
912 cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP3);
913 cmd->resp[1] = readl(host->regs + SD_EMMC_CMD_RSP2);
914 cmd->resp[2] = readl(host->regs + SD_EMMC_CMD_RSP1);
915 cmd->resp[3] = readl(host->regs + SD_EMMC_CMD_RSP);
916 } else if (cmd->flags & MMC_RSP_PRESENT) {
917 cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP);
918 }
919 }
920
__meson_mmc_enable_sdio_irq(struct mmc_host * mmc,int enable)921 static void __meson_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
922 {
923 struct meson_host *host = mmc_priv(mmc);
924 u32 reg_irqen = IRQ_EN_MASK;
925
926 if (enable)
927 reg_irqen |= IRQ_SDIO;
928 writel(reg_irqen, host->regs + SD_EMMC_IRQ_EN);
929 }
930
meson_mmc_irq(int irq,void * dev_id)931 static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
932 {
933 struct meson_host *host = dev_id;
934 struct mmc_command *cmd;
935 u32 status, raw_status, irq_mask = IRQ_EN_MASK;
936 irqreturn_t ret = IRQ_NONE;
937
938 if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
939 irq_mask |= IRQ_SDIO;
940 raw_status = readl(host->regs + SD_EMMC_STATUS);
941 status = raw_status & irq_mask;
942
943 if (!status) {
944 dev_dbg(host->dev,
945 "Unexpected IRQ! irq_en 0x%08x - status 0x%08x\n",
946 irq_mask, raw_status);
947 return IRQ_NONE;
948 }
949
950 /* ack all raised interrupts */
951 writel(status, host->regs + SD_EMMC_STATUS);
952
953 cmd = host->cmd;
954
955 if (status & IRQ_SDIO) {
956 spin_lock(&host->lock);
957 __meson_mmc_enable_sdio_irq(host->mmc, 0);
958 sdio_signal_irq(host->mmc);
959 spin_unlock(&host->lock);
960 status &= ~IRQ_SDIO;
961 if (!status)
962 return IRQ_HANDLED;
963 }
964
965 if (WARN_ON(!cmd))
966 return IRQ_NONE;
967
968 cmd->error = 0;
969 if (status & IRQ_CRC_ERR) {
970 dev_dbg(host->dev, "CRC Error - status 0x%08x\n", status);
971 cmd->error = -EILSEQ;
972 ret = IRQ_WAKE_THREAD;
973 goto out;
974 }
975
976 if (status & IRQ_TIMEOUTS) {
977 dev_dbg(host->dev, "Timeout - status 0x%08x\n", status);
978 cmd->error = -ETIMEDOUT;
979 ret = IRQ_WAKE_THREAD;
980 goto out;
981 }
982
983 meson_mmc_read_resp(host->mmc, cmd);
984
985 if (status & (IRQ_END_OF_CHAIN | IRQ_RESP_STATUS)) {
986 struct mmc_data *data = cmd->data;
987
988 if (data && !cmd->error)
989 data->bytes_xfered = data->blksz * data->blocks;
990
991 return IRQ_WAKE_THREAD;
992 }
993
994 out:
995 if (cmd->error) {
996 /* Stop desc in case of errors */
997 u32 start = readl(host->regs + SD_EMMC_START);
998
999 start &= ~START_DESC_BUSY;
1000 writel(start, host->regs + SD_EMMC_START);
1001 }
1002
1003 return ret;
1004 }
1005
meson_mmc_wait_desc_stop(struct meson_host * host)1006 static int meson_mmc_wait_desc_stop(struct meson_host *host)
1007 {
1008 u32 status;
1009
1010 /*
1011 * It may sometimes take a while for it to actually halt. Here, we
1012 * are giving it 5ms to comply
1013 *
1014 * If we don't confirm the descriptor is stopped, it might raise new
1015 * IRQs after we have called mmc_request_done() which is bad.
1016 */
1017
1018 return readl_poll_timeout(host->regs + SD_EMMC_STATUS, status,
1019 !(status & (STATUS_BUSY | STATUS_DESC_BUSY)),
1020 100, 5000);
1021 }
1022
meson_mmc_irq_thread(int irq,void * dev_id)1023 static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
1024 {
1025 struct meson_host *host = dev_id;
1026 struct mmc_command *next_cmd, *cmd = host->cmd;
1027 struct mmc_data *data;
1028 unsigned int xfer_bytes;
1029
1030 if (WARN_ON(!cmd))
1031 return IRQ_NONE;
1032
1033 if (cmd->error) {
1034 meson_mmc_wait_desc_stop(host);
1035 meson_mmc_request_done(host->mmc, cmd->mrq);
1036
1037 return IRQ_HANDLED;
1038 }
1039
1040 data = cmd->data;
1041 if (meson_mmc_bounce_buf_read(data)) {
1042 xfer_bytes = data->blksz * data->blocks;
1043 WARN_ON(xfer_bytes > host->bounce_buf_size);
1044 if (host->dram_access_quirk)
1045 meson_mmc_copy_buffer(host, data, xfer_bytes, false);
1046 else
1047 sg_copy_from_buffer(data->sg, data->sg_len,
1048 host->bounce_buf, xfer_bytes);
1049 }
1050
1051 next_cmd = meson_mmc_get_next_command(cmd);
1052 if (next_cmd)
1053 meson_mmc_start_cmd(host->mmc, next_cmd);
1054 else
1055 meson_mmc_request_done(host->mmc, cmd->mrq);
1056
1057 return IRQ_HANDLED;
1058 }
1059
meson_mmc_cfg_init(struct meson_host * host)1060 static void meson_mmc_cfg_init(struct meson_host *host)
1061 {
1062 u32 cfg = 0;
1063
1064 cfg |= FIELD_PREP(CFG_RESP_TIMEOUT_MASK,
1065 ilog2(SD_EMMC_CFG_RESP_TIMEOUT));
1066 cfg |= FIELD_PREP(CFG_RC_CC_MASK, ilog2(SD_EMMC_CFG_CMD_GAP));
1067 cfg |= FIELD_PREP(CFG_BLK_LEN_MASK, ilog2(SD_EMMC_CFG_BLK_SIZE));
1068
1069 /* abort chain on R/W errors */
1070 cfg |= CFG_ERR_ABORT;
1071
1072 writel(cfg, host->regs + SD_EMMC_CFG);
1073 }
1074
meson_mmc_card_busy(struct mmc_host * mmc)1075 static int meson_mmc_card_busy(struct mmc_host *mmc)
1076 {
1077 struct meson_host *host = mmc_priv(mmc);
1078 u32 regval;
1079
1080 regval = readl(host->regs + SD_EMMC_STATUS);
1081
1082 /* We are only interrested in lines 0 to 3, so mask the other ones */
1083 return !(FIELD_GET(STATUS_DATI, regval) & 0xf);
1084 }
1085
meson_mmc_voltage_switch(struct mmc_host * mmc,struct mmc_ios * ios)1086 static int meson_mmc_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
1087 {
1088 int ret;
1089
1090 /* vqmmc regulator is available */
1091 if (!IS_ERR(mmc->supply.vqmmc)) {
1092 /*
1093 * The usual amlogic setup uses a GPIO to switch from one
1094 * regulator to the other. While the voltage ramp up is
1095 * pretty fast, care must be taken when switching from 3.3v
1096 * to 1.8v. Please make sure the regulator framework is aware
1097 * of your own regulator constraints
1098 */
1099 ret = mmc_regulator_set_vqmmc(mmc, ios);
1100 return ret < 0 ? ret : 0;
1101 }
1102
1103 /* no vqmmc regulator, assume fixed regulator at 3/3.3V */
1104 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1105 return 0;
1106
1107 return -EINVAL;
1108 }
1109
meson_mmc_enable_sdio_irq(struct mmc_host * mmc,int enable)1110 static void meson_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
1111 {
1112 struct meson_host *host = mmc_priv(mmc);
1113 unsigned long flags;
1114
1115 spin_lock_irqsave(&host->lock, flags);
1116 __meson_mmc_enable_sdio_irq(mmc, enable);
1117 spin_unlock_irqrestore(&host->lock, flags);
1118 }
1119
meson_mmc_ack_sdio_irq(struct mmc_host * mmc)1120 static void meson_mmc_ack_sdio_irq(struct mmc_host *mmc)
1121 {
1122 meson_mmc_enable_sdio_irq(mmc, 1);
1123 }
1124
1125 static const struct mmc_host_ops meson_mmc_ops = {
1126 .request = meson_mmc_request,
1127 .set_ios = meson_mmc_set_ios,
1128 .get_cd = mmc_gpio_get_cd,
1129 .pre_req = meson_mmc_pre_req,
1130 .post_req = meson_mmc_post_req,
1131 .execute_tuning = meson_mmc_resampling_tuning,
1132 .card_busy = meson_mmc_card_busy,
1133 .start_signal_voltage_switch = meson_mmc_voltage_switch,
1134 .enable_sdio_irq = meson_mmc_enable_sdio_irq,
1135 .ack_sdio_irq = meson_mmc_ack_sdio_irq,
1136 };
1137
meson_mmc_probe(struct platform_device * pdev)1138 static int meson_mmc_probe(struct platform_device *pdev)
1139 {
1140 struct resource *res;
1141 struct meson_host *host;
1142 struct mmc_host *mmc;
1143 struct clk *core_clk;
1144 int cd_irq, ret;
1145
1146 mmc = devm_mmc_alloc_host(&pdev->dev, sizeof(struct meson_host));
1147 if (!mmc)
1148 return -ENOMEM;
1149 host = mmc_priv(mmc);
1150 host->mmc = mmc;
1151 host->dev = &pdev->dev;
1152 dev_set_drvdata(&pdev->dev, host);
1153
1154 /* The G12A SDIO Controller needs an SRAM bounce buffer */
1155 host->dram_access_quirk = device_property_read_bool(&pdev->dev,
1156 "amlogic,dram-access-quirk");
1157
1158 /* Get regulators and the supported OCR mask */
1159 ret = mmc_regulator_get_supply(mmc);
1160 if (ret)
1161 return ret;
1162
1163 ret = mmc_of_parse(mmc);
1164 if (ret)
1165 return dev_err_probe(&pdev->dev, ret, "error parsing DT\n");
1166
1167 mmc->caps |= MMC_CAP_CMD23;
1168
1169 if (mmc->caps & MMC_CAP_SDIO_IRQ)
1170 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
1171
1172 host->data = of_device_get_match_data(&pdev->dev);
1173 if (!host->data)
1174 return -EINVAL;
1175
1176 ret = device_reset_optional(&pdev->dev);
1177 if (ret)
1178 return dev_err_probe(&pdev->dev, ret, "device reset failed\n");
1179
1180 host->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1181 if (IS_ERR(host->regs))
1182 return PTR_ERR(host->regs);
1183
1184 host->irq = platform_get_irq(pdev, 0);
1185 if (host->irq < 0)
1186 return host->irq;
1187
1188 cd_irq = platform_get_irq_optional(pdev, 1);
1189 mmc_gpio_set_cd_irq(mmc, cd_irq);
1190
1191 host->pinctrl = devm_pinctrl_get(&pdev->dev);
1192 if (IS_ERR(host->pinctrl))
1193 return PTR_ERR(host->pinctrl);
1194
1195 host->pins_clk_gate = pinctrl_lookup_state(host->pinctrl,
1196 "clk-gate");
1197 if (IS_ERR(host->pins_clk_gate)) {
1198 dev_warn(&pdev->dev,
1199 "can't get clk-gate pinctrl, using clk_stop bit\n");
1200 host->pins_clk_gate = NULL;
1201 }
1202
1203 core_clk = devm_clk_get_enabled(&pdev->dev, "core");
1204 if (IS_ERR(core_clk))
1205 return PTR_ERR(core_clk);
1206
1207 ret = meson_mmc_clk_init(host);
1208 if (ret)
1209 return ret;
1210
1211 /* set config to sane default */
1212 meson_mmc_cfg_init(host);
1213
1214 /* Stop execution */
1215 writel(0, host->regs + SD_EMMC_START);
1216
1217 /* clear, ack and enable interrupts */
1218 writel(0, host->regs + SD_EMMC_IRQ_EN);
1219 writel(IRQ_EN_MASK, host->regs + SD_EMMC_STATUS);
1220 writel(IRQ_EN_MASK, host->regs + SD_EMMC_IRQ_EN);
1221
1222 ret = request_threaded_irq(host->irq, meson_mmc_irq,
1223 meson_mmc_irq_thread, IRQF_ONESHOT,
1224 dev_name(&pdev->dev), host);
1225 if (ret)
1226 goto err_init_clk;
1227
1228 spin_lock_init(&host->lock);
1229
1230 if (host->dram_access_quirk) {
1231 /* Limit segments to 1 due to low available sram memory */
1232 mmc->max_segs = 1;
1233 /* Limit to the available sram memory */
1234 mmc->max_blk_count = SD_EMMC_SRAM_DATA_BUF_LEN /
1235 mmc->max_blk_size;
1236 } else {
1237 mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
1238 mmc->max_segs = SD_EMMC_DESC_BUF_LEN /
1239 sizeof(struct sd_emmc_desc);
1240 }
1241 mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
1242 mmc->max_seg_size = mmc->max_req_size;
1243
1244 /*
1245 * At the moment, we don't know how to reliably enable HS400.
1246 * From the different datasheets, it is not even clear if this mode
1247 * is officially supported by any of the SoCs
1248 */
1249 mmc->caps2 &= ~MMC_CAP2_HS400;
1250
1251 if (host->dram_access_quirk) {
1252 /*
1253 * The MMC Controller embeds 1,5KiB of internal SRAM
1254 * that can be used to be used as bounce buffer.
1255 * In the case of the G12A SDIO controller, use these
1256 * instead of the DDR memory
1257 */
1258 host->bounce_buf_size = SD_EMMC_SRAM_DATA_BUF_LEN;
1259 host->bounce_iomem_buf = host->regs + SD_EMMC_SRAM_DATA_BUF_OFF;
1260 host->bounce_dma_addr = res->start + SD_EMMC_SRAM_DATA_BUF_OFF;
1261 } else {
1262 /* data bounce buffer */
1263 host->bounce_buf_size = mmc->max_req_size;
1264 host->bounce_buf =
1265 dmam_alloc_coherent(host->dev, host->bounce_buf_size,
1266 &host->bounce_dma_addr, GFP_KERNEL);
1267 if (host->bounce_buf == NULL) {
1268 dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
1269 ret = -ENOMEM;
1270 goto err_free_irq;
1271 }
1272 }
1273
1274 host->descs = dmam_alloc_coherent(host->dev, SD_EMMC_DESC_BUF_LEN,
1275 &host->descs_dma_addr, GFP_KERNEL);
1276 if (!host->descs) {
1277 dev_err(host->dev, "Allocating descriptor DMA buffer failed\n");
1278 ret = -ENOMEM;
1279 goto err_free_irq;
1280 }
1281
1282 mmc->ops = &meson_mmc_ops;
1283 ret = mmc_add_host(mmc);
1284 if (ret)
1285 goto err_free_irq;
1286
1287 return 0;
1288
1289 err_free_irq:
1290 free_irq(host->irq, host);
1291 err_init_clk:
1292 clk_disable_unprepare(host->mmc_clk);
1293 return ret;
1294 }
1295
meson_mmc_remove(struct platform_device * pdev)1296 static void meson_mmc_remove(struct platform_device *pdev)
1297 {
1298 struct meson_host *host = dev_get_drvdata(&pdev->dev);
1299
1300 mmc_remove_host(host->mmc);
1301
1302 /* disable interrupts */
1303 writel(0, host->regs + SD_EMMC_IRQ_EN);
1304 free_irq(host->irq, host);
1305
1306 clk_disable_unprepare(host->mmc_clk);
1307 }
1308
1309 static const struct meson_mmc_data meson_gx_data = {
1310 .tx_delay_mask = CLK_V2_TX_DELAY_MASK,
1311 .rx_delay_mask = CLK_V2_RX_DELAY_MASK,
1312 .always_on = CLK_V2_ALWAYS_ON,
1313 .adjust = SD_EMMC_ADJUST,
1314 .irq_sdio_sleep = CLK_V2_IRQ_SDIO_SLEEP,
1315 };
1316
1317 static const struct meson_mmc_data meson_axg_data = {
1318 .tx_delay_mask = CLK_V3_TX_DELAY_MASK,
1319 .rx_delay_mask = CLK_V3_RX_DELAY_MASK,
1320 .always_on = CLK_V3_ALWAYS_ON,
1321 .adjust = SD_EMMC_V3_ADJUST,
1322 .irq_sdio_sleep = CLK_V3_IRQ_SDIO_SLEEP,
1323 };
1324
1325 static const struct of_device_id meson_mmc_of_match[] = {
1326 { .compatible = "amlogic,meson-gx-mmc", .data = &meson_gx_data },
1327 { .compatible = "amlogic,meson-gxbb-mmc", .data = &meson_gx_data },
1328 { .compatible = "amlogic,meson-gxl-mmc", .data = &meson_gx_data },
1329 { .compatible = "amlogic,meson-gxm-mmc", .data = &meson_gx_data },
1330 { .compatible = "amlogic,meson-axg-mmc", .data = &meson_axg_data },
1331 {}
1332 };
1333 MODULE_DEVICE_TABLE(of, meson_mmc_of_match);
1334
1335 static struct platform_driver meson_mmc_driver = {
1336 .probe = meson_mmc_probe,
1337 .remove_new = meson_mmc_remove,
1338 .driver = {
1339 .name = DRIVER_NAME,
1340 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1341 .of_match_table = meson_mmc_of_match,
1342 },
1343 };
1344
1345 module_platform_driver(meson_mmc_driver);
1346
1347 MODULE_DESCRIPTION("Amlogic S905*/GX*/AXG SD/eMMC driver");
1348 MODULE_AUTHOR("Kevin Hilman <khilman@baylibre.com>");
1349 MODULE_LICENSE("GPL v2");
1350