xref: /openbmc/linux/drivers/mmc/host/meson-gx-mmc.c (revision 2c8d96a4)
1 /*
2  * Amlogic SD/eMMC driver for the GX/S905 family SoCs
3  *
4  * Copyright (c) 2016 BayLibre, SAS.
5  * Author: Kevin Hilman <khilman@baylibre.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of version 2 of the GNU General Public License as
9  * published by the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful, but
12  * WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
18  * The full GNU General Public License is included in this distribution
19  * in the file called COPYING.
20  */
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/device.h>
25 #include <linux/of_device.h>
26 #include <linux/platform_device.h>
27 #include <linux/ioport.h>
28 #include <linux/spinlock.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/mmc/host.h>
31 #include <linux/mmc/mmc.h>
32 #include <linux/mmc/sdio.h>
33 #include <linux/mmc/slot-gpio.h>
34 #include <linux/io.h>
35 #include <linux/clk.h>
36 #include <linux/clk-provider.h>
37 #include <linux/regulator/consumer.h>
38 #include <linux/interrupt.h>
39 
40 #define DRIVER_NAME "meson-gx-mmc"
41 
42 #define SD_EMMC_CLOCK 0x0
43 #define   CLK_DIV_SHIFT 0
44 #define   CLK_DIV_WIDTH 6
45 #define   CLK_DIV_MASK 0x3f
46 #define   CLK_DIV_MAX 63
47 #define   CLK_SRC_SHIFT 6
48 #define   CLK_SRC_WIDTH 2
49 #define   CLK_SRC_MASK 0x3
50 #define   CLK_SRC_XTAL 0   /* external crystal */
51 #define   CLK_SRC_XTAL_RATE 24000000
52 #define   CLK_SRC_PLL 1    /* FCLK_DIV2 */
53 #define   CLK_SRC_PLL_RATE 1000000000
54 #define   CLK_PHASE_SHIFT 8
55 #define   CLK_PHASE_MASK 0x3
56 #define   CLK_PHASE_0 0
57 #define   CLK_PHASE_90 1
58 #define   CLK_PHASE_180 2
59 #define   CLK_PHASE_270 3
60 #define   CLK_ALWAYS_ON BIT(24)
61 
62 #define SD_EMMC_DElAY 0x4
63 #define SD_EMMC_ADJUST 0x8
64 #define SD_EMMC_CALOUT 0x10
65 #define SD_EMMC_START 0x40
66 #define   START_DESC_INIT BIT(0)
67 #define   START_DESC_BUSY BIT(1)
68 #define   START_DESC_ADDR_SHIFT 2
69 #define   START_DESC_ADDR_MASK (~0x3)
70 
71 #define SD_EMMC_CFG 0x44
72 #define   CFG_BUS_WIDTH_SHIFT 0
73 #define   CFG_BUS_WIDTH_MASK 0x3
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_SHIFT 4
79 #define   CFG_BLK_LEN_MASK 0xf
80 #define   CFG_RESP_TIMEOUT_SHIFT 8
81 #define   CFG_RESP_TIMEOUT_MASK 0xf
82 #define   CFG_RC_CC_SHIFT 12
83 #define   CFG_RC_CC_MASK 0xf
84 #define   CFG_STOP_CLOCK BIT(22)
85 #define   CFG_CLK_ALWAYS_ON BIT(18)
86 #define   CFG_CHK_DS BIT(20)
87 #define   CFG_AUTO_CLK BIT(23)
88 
89 #define SD_EMMC_STATUS 0x48
90 #define   STATUS_BUSY BIT(31)
91 
92 #define SD_EMMC_IRQ_EN 0x4c
93 #define   IRQ_EN_MASK 0x3fff
94 #define   IRQ_RXD_ERR_SHIFT 0
95 #define   IRQ_RXD_ERR_MASK 0xff
96 #define   IRQ_TXD_ERR BIT(8)
97 #define   IRQ_DESC_ERR BIT(9)
98 #define   IRQ_RESP_ERR BIT(10)
99 #define   IRQ_RESP_TIMEOUT BIT(11)
100 #define   IRQ_DESC_TIMEOUT BIT(12)
101 #define   IRQ_END_OF_CHAIN BIT(13)
102 #define   IRQ_RESP_STATUS BIT(14)
103 #define   IRQ_SDIO BIT(15)
104 
105 #define SD_EMMC_CMD_CFG 0x50
106 #define SD_EMMC_CMD_ARG 0x54
107 #define SD_EMMC_CMD_DAT 0x58
108 #define SD_EMMC_CMD_RSP 0x5c
109 #define SD_EMMC_CMD_RSP1 0x60
110 #define SD_EMMC_CMD_RSP2 0x64
111 #define SD_EMMC_CMD_RSP3 0x68
112 
113 #define SD_EMMC_RXD 0x94
114 #define SD_EMMC_TXD 0x94
115 #define SD_EMMC_LAST_REG SD_EMMC_TXD
116 
117 #define SD_EMMC_CFG_BLK_SIZE 512 /* internal buffer max: 512 bytes */
118 #define SD_EMMC_CFG_RESP_TIMEOUT 256 /* in clock cycles */
119 #define SD_EMMC_CMD_TIMEOUT 1024 /* in ms */
120 #define SD_EMMC_CMD_TIMEOUT_DATA 4096 /* in ms */
121 #define SD_EMMC_CFG_CMD_GAP 16 /* in clock cycles */
122 #define MUX_CLK_NUM_PARENTS 2
123 
124 struct meson_host {
125 	struct	device		*dev;
126 	struct	mmc_host	*mmc;
127 	struct	mmc_command	*cmd;
128 
129 	spinlock_t lock;
130 	void __iomem *regs;
131 	struct clk *core_clk;
132 	struct clk_mux mux;
133 	struct clk *mux_clk;
134 	unsigned long current_clock;
135 
136 	struct clk_divider cfg_div;
137 	struct clk *cfg_div_clk;
138 
139 	unsigned int bounce_buf_size;
140 	void *bounce_buf;
141 	dma_addr_t bounce_dma_addr;
142 
143 	bool vqmmc_enabled;
144 };
145 
146 struct sd_emmc_desc {
147 	u32 cmd_cfg;
148 	u32 cmd_arg;
149 	u32 cmd_data;
150 	u32 cmd_resp;
151 };
152 #define CMD_CFG_LENGTH_SHIFT 0
153 #define CMD_CFG_LENGTH_MASK 0x1ff
154 #define CMD_CFG_BLOCK_MODE BIT(9)
155 #define CMD_CFG_R1B BIT(10)
156 #define CMD_CFG_END_OF_CHAIN BIT(11)
157 #define CMD_CFG_TIMEOUT_SHIFT 12
158 #define CMD_CFG_TIMEOUT_MASK 0xf
159 #define CMD_CFG_NO_RESP BIT(16)
160 #define CMD_CFG_NO_CMD BIT(17)
161 #define CMD_CFG_DATA_IO BIT(18)
162 #define CMD_CFG_DATA_WR BIT(19)
163 #define CMD_CFG_RESP_NOCRC BIT(20)
164 #define CMD_CFG_RESP_128 BIT(21)
165 #define CMD_CFG_RESP_NUM BIT(22)
166 #define CMD_CFG_DATA_NUM BIT(23)
167 #define CMD_CFG_CMD_INDEX_SHIFT 24
168 #define CMD_CFG_CMD_INDEX_MASK 0x3f
169 #define CMD_CFG_ERROR BIT(30)
170 #define CMD_CFG_OWNER BIT(31)
171 
172 #define CMD_DATA_MASK (~0x3)
173 #define CMD_DATA_BIG_ENDIAN BIT(1)
174 #define CMD_DATA_SRAM BIT(0)
175 #define CMD_RESP_MASK (~0x1)
176 #define CMD_RESP_SRAM BIT(0)
177 
178 static int meson_mmc_clk_set(struct meson_host *host, unsigned long clk_rate)
179 {
180 	struct mmc_host *mmc = host->mmc;
181 	int ret;
182 	u32 cfg;
183 
184 	if (clk_rate) {
185 		if (WARN_ON(clk_rate > mmc->f_max))
186 			clk_rate = mmc->f_max;
187 		else if (WARN_ON(clk_rate < mmc->f_min))
188 			clk_rate = mmc->f_min;
189 	}
190 
191 	if (clk_rate == host->current_clock)
192 		return 0;
193 
194 	/* stop clock */
195 	cfg = readl(host->regs + SD_EMMC_CFG);
196 	if (!(cfg & CFG_STOP_CLOCK)) {
197 		cfg |= CFG_STOP_CLOCK;
198 		writel(cfg, host->regs + SD_EMMC_CFG);
199 	}
200 
201 	dev_dbg(host->dev, "change clock rate %u -> %lu\n",
202 		mmc->actual_clock, clk_rate);
203 
204 	if (!clk_rate) {
205 		mmc->actual_clock = 0;
206 		host->current_clock = 0;
207 		/* return with clock being stopped */
208 		return 0;
209 	}
210 
211 	ret = clk_set_rate(host->cfg_div_clk, clk_rate);
212 	if (ret) {
213 		dev_err(host->dev, "Unable to set cfg_div_clk to %lu. ret=%d\n",
214 			clk_rate, ret);
215 		return ret;
216 	}
217 
218 	mmc->actual_clock = clk_get_rate(host->cfg_div_clk);
219 	host->current_clock = clk_rate;
220 
221 	if (clk_rate != mmc->actual_clock)
222 		dev_dbg(host->dev,
223 			"divider requested rate %lu != actual rate %u\n",
224 			clk_rate, mmc->actual_clock);
225 
226 	/* (re)start clock */
227 	cfg = readl(host->regs + SD_EMMC_CFG);
228 	cfg &= ~CFG_STOP_CLOCK;
229 	writel(cfg, host->regs + SD_EMMC_CFG);
230 
231 	return 0;
232 }
233 
234 /*
235  * The SD/eMMC IP block has an internal mux and divider used for
236  * generating the MMC clock.  Use the clock framework to create and
237  * manage these clocks.
238  */
239 static int meson_mmc_clk_init(struct meson_host *host)
240 {
241 	struct clk_init_data init;
242 	char clk_name[32];
243 	int i, ret = 0;
244 	const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
245 	const char *clk_div_parents[1];
246 	u32 clk_reg, cfg;
247 
248 	/* get the mux parents */
249 	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
250 		struct clk *clk;
251 		char name[16];
252 
253 		snprintf(name, sizeof(name), "clkin%d", i);
254 		clk = devm_clk_get(host->dev, name);
255 		if (IS_ERR(clk)) {
256 			if (clk != ERR_PTR(-EPROBE_DEFER))
257 				dev_err(host->dev, "Missing clock %s\n", name);
258 			return PTR_ERR(clk);
259 		}
260 
261 		mux_parent_names[i] = __clk_get_name(clk);
262 	}
263 
264 	/* create the mux */
265 	snprintf(clk_name, sizeof(clk_name), "%s#mux", dev_name(host->dev));
266 	init.name = clk_name;
267 	init.ops = &clk_mux_ops;
268 	init.flags = 0;
269 	init.parent_names = mux_parent_names;
270 	init.num_parents = MUX_CLK_NUM_PARENTS;
271 
272 	host->mux.reg = host->regs + SD_EMMC_CLOCK;
273 	host->mux.shift = CLK_SRC_SHIFT;
274 	host->mux.mask = CLK_SRC_MASK;
275 	host->mux.flags = 0;
276 	host->mux.table = NULL;
277 	host->mux.hw.init = &init;
278 
279 	host->mux_clk = devm_clk_register(host->dev, &host->mux.hw);
280 	if (WARN_ON(IS_ERR(host->mux_clk)))
281 		return PTR_ERR(host->mux_clk);
282 
283 	/* create the divider */
284 	snprintf(clk_name, sizeof(clk_name), "%s#div", dev_name(host->dev));
285 	init.name = clk_name;
286 	init.ops = &clk_divider_ops;
287 	init.flags = CLK_SET_RATE_PARENT;
288 	clk_div_parents[0] = __clk_get_name(host->mux_clk);
289 	init.parent_names = clk_div_parents;
290 	init.num_parents = ARRAY_SIZE(clk_div_parents);
291 
292 	host->cfg_div.reg = host->regs + SD_EMMC_CLOCK;
293 	host->cfg_div.shift = CLK_DIV_SHIFT;
294 	host->cfg_div.width = CLK_DIV_WIDTH;
295 	host->cfg_div.hw.init = &init;
296 	host->cfg_div.flags = CLK_DIVIDER_ONE_BASED |
297 		CLK_DIVIDER_ROUND_CLOSEST | CLK_DIVIDER_ALLOW_ZERO;
298 
299 	host->cfg_div_clk = devm_clk_register(host->dev, &host->cfg_div.hw);
300 	if (WARN_ON(PTR_ERR_OR_ZERO(host->cfg_div_clk)))
301 		return PTR_ERR(host->cfg_div_clk);
302 
303 	/* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
304 	clk_reg = 0;
305 	clk_reg |= CLK_PHASE_180 << CLK_PHASE_SHIFT;
306 	clk_reg |= CLK_SRC_XTAL << CLK_SRC_SHIFT;
307 	clk_reg |= CLK_DIV_MAX << CLK_DIV_SHIFT;
308 	clk_reg &= ~CLK_ALWAYS_ON;
309 	writel(clk_reg, host->regs + SD_EMMC_CLOCK);
310 
311 	/* Ensure clock starts in "auto" mode, not "always on" */
312 	cfg = readl(host->regs + SD_EMMC_CFG);
313 	cfg &= ~CFG_CLK_ALWAYS_ON;
314 	cfg |= CFG_AUTO_CLK;
315 	writel(cfg, host->regs + SD_EMMC_CFG);
316 
317 	ret = clk_prepare_enable(host->cfg_div_clk);
318 	if (ret)
319 		return ret;
320 
321 	/* Get the nearest minimum clock to 400KHz */
322 	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
323 
324 	ret = meson_mmc_clk_set(host, host->mmc->f_min);
325 	if (ret)
326 		clk_disable_unprepare(host->cfg_div_clk);
327 
328 	return ret;
329 }
330 
331 static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
332 {
333 	struct meson_host *host = mmc_priv(mmc);
334 	u32 bus_width;
335 	u32 val, orig;
336 
337 	/*
338 	 * GPIO regulator, only controls switching between 1v8 and
339 	 * 3v3, doesn't support MMC_POWER_OFF, MMC_POWER_ON.
340 	 */
341 	switch (ios->power_mode) {
342 	case MMC_POWER_OFF:
343 		if (!IS_ERR(mmc->supply.vmmc))
344 			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
345 
346 		if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
347 			regulator_disable(mmc->supply.vqmmc);
348 			host->vqmmc_enabled = false;
349 		}
350 
351 		break;
352 
353 	case MMC_POWER_UP:
354 		if (!IS_ERR(mmc->supply.vmmc))
355 			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
356 		break;
357 
358 	case MMC_POWER_ON:
359 		if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
360 			int ret = regulator_enable(mmc->supply.vqmmc);
361 
362 			if (ret < 0)
363 				dev_err(mmc_dev(mmc),
364 					"failed to enable vqmmc regulator\n");
365 			else
366 				host->vqmmc_enabled = true;
367 		}
368 
369 		break;
370 	}
371 
372 
373 	meson_mmc_clk_set(host, ios->clock);
374 
375 	/* Bus width */
376 	switch (ios->bus_width) {
377 	case MMC_BUS_WIDTH_1:
378 		bus_width = CFG_BUS_WIDTH_1;
379 		break;
380 	case MMC_BUS_WIDTH_4:
381 		bus_width = CFG_BUS_WIDTH_4;
382 		break;
383 	case MMC_BUS_WIDTH_8:
384 		bus_width = CFG_BUS_WIDTH_8;
385 		break;
386 	default:
387 		dev_err(host->dev, "Invalid ios->bus_width: %u.  Setting to 4.\n",
388 			ios->bus_width);
389 		bus_width = CFG_BUS_WIDTH_4;
390 	}
391 
392 	val = readl(host->regs + SD_EMMC_CFG);
393 	orig = val;
394 
395 	val &= ~(CFG_BUS_WIDTH_MASK << CFG_BUS_WIDTH_SHIFT);
396 	val |= bus_width << CFG_BUS_WIDTH_SHIFT;
397 
398 	val &= ~CFG_DDR;
399 	if (ios->timing == MMC_TIMING_UHS_DDR50 ||
400 	    ios->timing == MMC_TIMING_MMC_DDR52 ||
401 	    ios->timing == MMC_TIMING_MMC_HS400)
402 		val |= CFG_DDR;
403 
404 	val &= ~CFG_CHK_DS;
405 	if (ios->timing == MMC_TIMING_MMC_HS400)
406 		val |= CFG_CHK_DS;
407 
408 	if (val != orig) {
409 		writel(val, host->regs + SD_EMMC_CFG);
410 		dev_dbg(host->dev, "%s: SD_EMMC_CFG: 0x%08x -> 0x%08x\n",
411 			__func__, orig, val);
412 	}
413 }
414 
415 static void meson_mmc_request_done(struct mmc_host *mmc,
416 				   struct mmc_request *mrq)
417 {
418 	struct meson_host *host = mmc_priv(mmc);
419 
420 	host->cmd = NULL;
421 	mmc_request_done(host->mmc, mrq);
422 }
423 
424 static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
425 {
426 	struct meson_host *host = mmc_priv(mmc);
427 	struct mmc_data *data = cmd->data;
428 	u32 cfg, cmd_cfg = 0, cmd_data = 0;
429 	u8 blk_len, cmd_cfg_timeout;
430 	unsigned int xfer_bytes = 0;
431 
432 	/* Setup descriptors */
433 	dma_rmb();
434 
435 	cmd_cfg |= (cmd->opcode & CMD_CFG_CMD_INDEX_MASK) <<
436 		   CMD_CFG_CMD_INDEX_SHIFT;
437 	cmd_cfg |= CMD_CFG_OWNER;  /* owned by CPU */
438 
439 	/* Response */
440 	if (cmd->flags & MMC_RSP_PRESENT) {
441 		if (cmd->flags & MMC_RSP_136)
442 			cmd_cfg |= CMD_CFG_RESP_128;
443 		cmd_cfg |= CMD_CFG_RESP_NUM;
444 
445 		if (!(cmd->flags & MMC_RSP_CRC))
446 			cmd_cfg |= CMD_CFG_RESP_NOCRC;
447 
448 		if (cmd->flags & MMC_RSP_BUSY)
449 			cmd_cfg |= CMD_CFG_R1B;
450 	} else {
451 		cmd_cfg |= CMD_CFG_NO_RESP;
452 	}
453 
454 	/* data? */
455 	if (data) {
456 		cmd_cfg |= CMD_CFG_DATA_IO;
457 		if (data->blocks > 1) {
458 			cmd_cfg |= CMD_CFG_BLOCK_MODE;
459 			cmd_cfg |= (data->blocks & CMD_CFG_LENGTH_MASK) <<
460 				   CMD_CFG_LENGTH_SHIFT;
461 
462 			/* check if block-size matches, if not update */
463 			cfg = readl(host->regs + SD_EMMC_CFG);
464 			blk_len = cfg & (CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
465 			blk_len >>= CFG_BLK_LEN_SHIFT;
466 			if (blk_len != ilog2(data->blksz)) {
467 				dev_dbg(host->dev, "%s: update blk_len %d -> %d\n",
468 					__func__, blk_len,
469 					ilog2(data->blksz));
470 				blk_len = ilog2(data->blksz);
471 				cfg &= ~(CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
472 				cfg |= blk_len << CFG_BLK_LEN_SHIFT;
473 				writel(cfg, host->regs + SD_EMMC_CFG);
474 			}
475 		} else {
476 			cmd_cfg |= (data->blksz & CMD_CFG_LENGTH_MASK) <<
477 				   CMD_CFG_LENGTH_SHIFT;
478 		}
479 
480 		data->bytes_xfered = 0;
481 		xfer_bytes = data->blksz * data->blocks;
482 		if (data->flags & MMC_DATA_WRITE) {
483 			cmd_cfg |= CMD_CFG_DATA_WR;
484 			WARN_ON(xfer_bytes > host->bounce_buf_size);
485 			sg_copy_to_buffer(data->sg, data->sg_len,
486 					  host->bounce_buf, xfer_bytes);
487 			dma_wmb();
488 		}
489 
490 		cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
491 
492 		cmd_cfg_timeout = ilog2(SD_EMMC_CMD_TIMEOUT_DATA);
493 	} else {
494 		cmd_cfg_timeout = ilog2(SD_EMMC_CMD_TIMEOUT);
495 	}
496 	cmd_cfg |= (cmd_cfg_timeout & CMD_CFG_TIMEOUT_MASK) <<
497 		   CMD_CFG_TIMEOUT_SHIFT;
498 
499 	host->cmd = cmd;
500 
501 	/* Last descriptor */
502 	cmd_cfg |= CMD_CFG_END_OF_CHAIN;
503 	writel(cmd_cfg, host->regs + SD_EMMC_CMD_CFG);
504 	writel(cmd_data, host->regs + SD_EMMC_CMD_DAT);
505 	writel(0, host->regs + SD_EMMC_CMD_RSP);
506 	wmb(); /* ensure descriptor is written before kicked */
507 	writel(cmd->arg, host->regs + SD_EMMC_CMD_ARG);
508 }
509 
510 static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
511 {
512 	struct meson_host *host = mmc_priv(mmc);
513 
514 	/* Stop execution */
515 	writel(0, host->regs + SD_EMMC_START);
516 
517 	if (mrq->sbc)
518 		meson_mmc_start_cmd(mmc, mrq->sbc);
519 	else
520 		meson_mmc_start_cmd(mmc, mrq->cmd);
521 }
522 
523 static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
524 {
525 	struct meson_host *host = mmc_priv(mmc);
526 
527 	if (cmd->flags & MMC_RSP_136) {
528 		cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP3);
529 		cmd->resp[1] = readl(host->regs + SD_EMMC_CMD_RSP2);
530 		cmd->resp[2] = readl(host->regs + SD_EMMC_CMD_RSP1);
531 		cmd->resp[3] = readl(host->regs + SD_EMMC_CMD_RSP);
532 	} else if (cmd->flags & MMC_RSP_PRESENT) {
533 		cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP);
534 	}
535 }
536 
537 static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
538 {
539 	struct meson_host *host = dev_id;
540 	struct mmc_command *cmd;
541 	struct mmc_data *data;
542 	u32 irq_en, status, raw_status;
543 	irqreturn_t ret = IRQ_HANDLED;
544 
545 	if (WARN_ON(!host))
546 		return IRQ_NONE;
547 
548 	cmd = host->cmd;
549 
550 	if (WARN_ON(!cmd))
551 		return IRQ_NONE;
552 
553 	data = cmd->data;
554 
555 	spin_lock(&host->lock);
556 	irq_en = readl(host->regs + SD_EMMC_IRQ_EN);
557 	raw_status = readl(host->regs + SD_EMMC_STATUS);
558 	status = raw_status & irq_en;
559 
560 	if (!status) {
561 		dev_warn(host->dev, "Spurious IRQ! status=0x%08x, irq_en=0x%08x\n",
562 			 raw_status, irq_en);
563 		ret = IRQ_NONE;
564 		goto out;
565 	}
566 
567 	meson_mmc_read_resp(host->mmc, cmd);
568 
569 	cmd->error = 0;
570 	if (status & IRQ_RXD_ERR_MASK) {
571 		dev_dbg(host->dev, "Unhandled IRQ: RXD error\n");
572 		cmd->error = -EILSEQ;
573 	}
574 	if (status & IRQ_TXD_ERR) {
575 		dev_dbg(host->dev, "Unhandled IRQ: TXD error\n");
576 		cmd->error = -EILSEQ;
577 	}
578 	if (status & IRQ_DESC_ERR)
579 		dev_dbg(host->dev, "Unhandled IRQ: Descriptor error\n");
580 	if (status & IRQ_RESP_ERR) {
581 		dev_dbg(host->dev, "Unhandled IRQ: Response error\n");
582 		cmd->error = -EILSEQ;
583 	}
584 	if (status & IRQ_RESP_TIMEOUT) {
585 		dev_dbg(host->dev, "Unhandled IRQ: Response timeout\n");
586 		cmd->error = -ETIMEDOUT;
587 	}
588 	if (status & IRQ_DESC_TIMEOUT) {
589 		dev_dbg(host->dev, "Unhandled IRQ: Descriptor timeout\n");
590 		cmd->error = -ETIMEDOUT;
591 	}
592 	if (status & IRQ_SDIO)
593 		dev_dbg(host->dev, "Unhandled IRQ: SDIO.\n");
594 
595 	if (status & (IRQ_END_OF_CHAIN | IRQ_RESP_STATUS)) {
596 		if (data && !cmd->error)
597 			data->bytes_xfered = data->blksz * data->blocks;
598 		ret = IRQ_WAKE_THREAD;
599 	} else {
600 		dev_warn(host->dev, "Unknown IRQ! status=0x%04x: MMC CMD%u arg=0x%08x flags=0x%08x stop=%d\n",
601 			 status, cmd->opcode, cmd->arg,
602 			 cmd->flags, cmd->mrq->stop ? 1 : 0);
603 		if (cmd->data) {
604 			struct mmc_data *data = cmd->data;
605 
606 			dev_warn(host->dev, "\tblksz %u blocks %u flags 0x%08x (%s%s)",
607 				 data->blksz, data->blocks, data->flags,
608 				 data->flags & MMC_DATA_WRITE ? "write" : "",
609 				 data->flags & MMC_DATA_READ ? "read" : "");
610 		}
611 	}
612 
613 out:
614 	/* ack all (enabled) interrupts */
615 	writel(status, host->regs + SD_EMMC_STATUS);
616 
617 	if (ret == IRQ_HANDLED)
618 		meson_mmc_request_done(host->mmc, cmd->mrq);
619 
620 	spin_unlock(&host->lock);
621 	return ret;
622 }
623 
624 static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
625 {
626 	struct meson_host *host = dev_id;
627 	struct mmc_command *cmd = host->cmd;
628 	struct mmc_data *data;
629 	unsigned int xfer_bytes;
630 
631 	if (WARN_ON(!cmd))
632 		return IRQ_NONE;
633 
634 	data = cmd->data;
635 	if (data && data->flags & MMC_DATA_READ) {
636 		xfer_bytes = data->blksz * data->blocks;
637 		WARN_ON(xfer_bytes > host->bounce_buf_size);
638 		sg_copy_from_buffer(data->sg, data->sg_len,
639 				    host->bounce_buf, xfer_bytes);
640 	}
641 
642 	if (!data || !data->stop || cmd->mrq->sbc)
643 		meson_mmc_request_done(host->mmc, cmd->mrq);
644 	else
645 		meson_mmc_start_cmd(host->mmc, data->stop);
646 
647 	return IRQ_HANDLED;
648 }
649 
650 /*
651  * NOTE: we only need this until the GPIO/pinctrl driver can handle
652  * interrupts.  For now, the MMC core will use this for polling.
653  */
654 static int meson_mmc_get_cd(struct mmc_host *mmc)
655 {
656 	int status = mmc_gpio_get_cd(mmc);
657 
658 	if (status == -ENOSYS)
659 		return 1; /* assume present */
660 
661 	return status;
662 }
663 
664 static void meson_mmc_cfg_init(struct meson_host *host)
665 {
666 	u32 cfg = 0;
667 
668 	cfg |= ilog2(SD_EMMC_CFG_RESP_TIMEOUT) << CFG_RESP_TIMEOUT_SHIFT;
669 	cfg |= ilog2(SD_EMMC_CFG_CMD_GAP) << CFG_RC_CC_SHIFT;
670 	cfg |= ilog2(SD_EMMC_CFG_BLK_SIZE) << CFG_BLK_LEN_SHIFT;
671 
672 	writel(cfg, host->regs + SD_EMMC_CFG);
673 }
674 
675 static const struct mmc_host_ops meson_mmc_ops = {
676 	.request	= meson_mmc_request,
677 	.set_ios	= meson_mmc_set_ios,
678 	.get_cd         = meson_mmc_get_cd,
679 };
680 
681 static int meson_mmc_probe(struct platform_device *pdev)
682 {
683 	struct resource *res;
684 	struct meson_host *host;
685 	struct mmc_host *mmc;
686 	int ret, irq;
687 
688 	mmc = mmc_alloc_host(sizeof(struct meson_host), &pdev->dev);
689 	if (!mmc)
690 		return -ENOMEM;
691 	host = mmc_priv(mmc);
692 	host->mmc = mmc;
693 	host->dev = &pdev->dev;
694 	dev_set_drvdata(&pdev->dev, host);
695 
696 	spin_lock_init(&host->lock);
697 
698 	/* Get regulators and the supported OCR mask */
699 	host->vqmmc_enabled = false;
700 	ret = mmc_regulator_get_supply(mmc);
701 	if (ret == -EPROBE_DEFER)
702 		goto free_host;
703 
704 	ret = mmc_of_parse(mmc);
705 	if (ret) {
706 		if (ret != -EPROBE_DEFER)
707 			dev_warn(&pdev->dev, "error parsing DT: %d\n", ret);
708 		goto free_host;
709 	}
710 
711 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
712 	host->regs = devm_ioremap_resource(&pdev->dev, res);
713 	if (IS_ERR(host->regs)) {
714 		ret = PTR_ERR(host->regs);
715 		goto free_host;
716 	}
717 
718 	irq = platform_get_irq(pdev, 0);
719 	if (!irq) {
720 		dev_err(&pdev->dev, "failed to get interrupt resource.\n");
721 		ret = -EINVAL;
722 		goto free_host;
723 	}
724 
725 	host->core_clk = devm_clk_get(&pdev->dev, "core");
726 	if (IS_ERR(host->core_clk)) {
727 		ret = PTR_ERR(host->core_clk);
728 		goto free_host;
729 	}
730 
731 	ret = clk_prepare_enable(host->core_clk);
732 	if (ret)
733 		goto free_host;
734 
735 	ret = meson_mmc_clk_init(host);
736 	if (ret)
737 		goto err_core_clk;
738 
739 	/* Stop execution */
740 	writel(0, host->regs + SD_EMMC_START);
741 
742 	/* clear, ack, enable all interrupts */
743 	writel(0, host->regs + SD_EMMC_IRQ_EN);
744 	writel(IRQ_EN_MASK, host->regs + SD_EMMC_STATUS);
745 	writel(IRQ_EN_MASK, host->regs + SD_EMMC_IRQ_EN);
746 
747 	/* set config to sane default */
748 	meson_mmc_cfg_init(host);
749 
750 	ret = devm_request_threaded_irq(&pdev->dev, irq, meson_mmc_irq,
751 					meson_mmc_irq_thread, IRQF_SHARED,
752 					DRIVER_NAME, host);
753 	if (ret)
754 		goto err_div_clk;
755 
756 	mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
757 	mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
758 
759 	/* data bounce buffer */
760 	host->bounce_buf_size = mmc->max_req_size;
761 	host->bounce_buf =
762 		dma_alloc_coherent(host->dev, host->bounce_buf_size,
763 				   &host->bounce_dma_addr, GFP_KERNEL);
764 	if (host->bounce_buf == NULL) {
765 		dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
766 		ret = -ENOMEM;
767 		goto err_div_clk;
768 	}
769 
770 	mmc->ops = &meson_mmc_ops;
771 	mmc_add_host(mmc);
772 
773 	return 0;
774 
775 err_div_clk:
776 	clk_disable_unprepare(host->cfg_div_clk);
777 err_core_clk:
778 	clk_disable_unprepare(host->core_clk);
779 free_host:
780 	mmc_free_host(mmc);
781 	return ret;
782 }
783 
784 static int meson_mmc_remove(struct platform_device *pdev)
785 {
786 	struct meson_host *host = dev_get_drvdata(&pdev->dev);
787 
788 	mmc_remove_host(host->mmc);
789 
790 	/* disable interrupts */
791 	writel(0, host->regs + SD_EMMC_IRQ_EN);
792 
793 	dma_free_coherent(host->dev, host->bounce_buf_size,
794 			  host->bounce_buf, host->bounce_dma_addr);
795 
796 	clk_disable_unprepare(host->cfg_div_clk);
797 	clk_disable_unprepare(host->core_clk);
798 
799 	mmc_free_host(host->mmc);
800 	return 0;
801 }
802 
803 static const struct of_device_id meson_mmc_of_match[] = {
804 	{ .compatible = "amlogic,meson-gx-mmc", },
805 	{ .compatible = "amlogic,meson-gxbb-mmc", },
806 	{ .compatible = "amlogic,meson-gxl-mmc", },
807 	{ .compatible = "amlogic,meson-gxm-mmc", },
808 	{}
809 };
810 MODULE_DEVICE_TABLE(of, meson_mmc_of_match);
811 
812 static struct platform_driver meson_mmc_driver = {
813 	.probe		= meson_mmc_probe,
814 	.remove		= meson_mmc_remove,
815 	.driver		= {
816 		.name = DRIVER_NAME,
817 		.of_match_table = of_match_ptr(meson_mmc_of_match),
818 	},
819 };
820 
821 module_platform_driver(meson_mmc_driver);
822 
823 MODULE_DESCRIPTION("Amlogic S905*/GX* SD/eMMC driver");
824 MODULE_AUTHOR("Kevin Hilman <khilman@baylibre.com>");
825 MODULE_LICENSE("GPL v2");
826