xref: /openbmc/u-boot/drivers/spi/stm32_qspi.c (revision 76b00aca)
1 /*
2  * (C) Copyright 2016
3  *
4  * Michael Kurz, <michi.kurz@gmail.com>
5  *
6  * STM32 QSPI driver
7  *
8  * SPDX-License-Identifier:	GPL-2.0+
9  */
10 
11 #include <common.h>
12 #include <malloc.h>
13 #include <spi.h>
14 #include <spi_flash.h>
15 #include <asm/io.h>
16 #include <dm.h>
17 #include <errno.h>
18 #include <asm/arch/stm32.h>
19 #include <asm/arch/stm32_defs.h>
20 
21 DECLARE_GLOBAL_DATA_PTR;
22 
23 struct stm32_qspi_regs {
24 	u32 cr;		/* 0x00 */
25 	u32 dcr;	/* 0x04 */
26 	u32 sr;		/* 0x08 */
27 	u32 fcr;	/* 0x0C */
28 	u32 dlr;	/* 0x10 */
29 	u32 ccr;	/* 0x14 */
30 	u32 ar;		/* 0x18 */
31 	u32 abr;	/* 0x1C */
32 	u32 dr;		/* 0x20 */
33 	u32 psmkr;	/* 0x24 */
34 	u32 psmar;	/* 0x28 */
35 	u32 pir;	/* 0x2C */
36 	u32 lptr;	/* 0x30 */
37 };
38 
39 /*
40  * QUADSPI control register
41  */
42 #define STM32_QSPI_CR_EN		BIT(0)
43 #define STM32_QSPI_CR_ABORT		BIT(1)
44 #define STM32_QSPI_CR_DMAEN		BIT(2)
45 #define STM32_QSPI_CR_TCEN		BIT(3)
46 #define STM32_QSPI_CR_SSHIFT		BIT(4)
47 #define STM32_QSPI_CR_DFM		BIT(6)
48 #define STM32_QSPI_CR_FSEL		BIT(7)
49 #define STM32_QSPI_CR_FTHRES_MASK	GENMASK(4, 0)
50 #define STM32_QSPI_CR_FTHRES_SHIFT	(8)
51 #define STM32_QSPI_CR_TEIE		BIT(16)
52 #define STM32_QSPI_CR_TCIE		BIT(17)
53 #define STM32_QSPI_CR_FTIE		BIT(18)
54 #define STM32_QSPI_CR_SMIE		BIT(19)
55 #define STM32_QSPI_CR_TOIE		BIT(20)
56 #define STM32_QSPI_CR_APMS		BIT(22)
57 #define STM32_QSPI_CR_PMM		BIT(23)
58 #define STM32_QSPI_CR_PRESCALER_MASK	GENMASK(7, 0)
59 #define STM32_QSPI_CR_PRESCALER_SHIFT	(24)
60 
61 /*
62  * QUADSPI device configuration register
63  */
64 #define STM32_QSPI_DCR_CKMODE		BIT(0)
65 #define STM32_QSPI_DCR_CSHT_MASK	GENMASK(2, 0)
66 #define STM32_QSPI_DCR_CSHT_SHIFT	(8)
67 #define STM32_QSPI_DCR_FSIZE_MASK	GENMASK(4, 0)
68 #define STM32_QSPI_DCR_FSIZE_SHIFT	(16)
69 
70 /*
71  * QUADSPI status register
72  */
73 #define STM32_QSPI_SR_TEF		BIT(0)
74 #define STM32_QSPI_SR_TCF		BIT(1)
75 #define STM32_QSPI_SR_FTF		BIT(2)
76 #define STM32_QSPI_SR_SMF		BIT(3)
77 #define STM32_QSPI_SR_TOF		BIT(4)
78 #define STM32_QSPI_SR_BUSY		BIT(5)
79 #define STM32_QSPI_SR_FLEVEL_MASK	GENMASK(5, 0)
80 #define STM32_QSPI_SR_FLEVEL_SHIFT	(8)
81 
82 /*
83  * QUADSPI flag clear register
84  */
85 #define STM32_QSPI_FCR_CTEF		BIT(0)
86 #define STM32_QSPI_FCR_CTCF		BIT(1)
87 #define STM32_QSPI_FCR_CSMF		BIT(3)
88 #define STM32_QSPI_FCR_CTOF		BIT(4)
89 
90 /*
91  * QUADSPI communication configuration register
92  */
93 #define STM32_QSPI_CCR_DDRM		BIT(31)
94 #define STM32_QSPI_CCR_DHHC		BIT(30)
95 #define STM32_QSPI_CCR_SIOO		BIT(28)
96 #define STM32_QSPI_CCR_FMODE_SHIFT	(26)
97 #define STM32_QSPI_CCR_DMODE_SHIFT	(24)
98 #define STM32_QSPI_CCR_DCYC_SHIFT	(18)
99 #define STM32_QSPI_CCR_DCYC_MASK	GENMASK(4, 0)
100 #define STM32_QSPI_CCR_ABSIZE_SHIFT	(16)
101 #define STM32_QSPI_CCR_ABMODE_SHIFT	(14)
102 #define STM32_QSPI_CCR_ADSIZE_SHIFT	(12)
103 #define STM32_QSPI_CCR_ADMODE_SHIFT	(10)
104 #define STM32_QSPI_CCR_IMODE_SHIFT	(8)
105 #define STM32_QSPI_CCR_INSTRUCTION_MASK	GENMASK(7, 0)
106 
107 enum STM32_QSPI_CCR_IMODE {
108 	STM32_QSPI_CCR_IMODE_NONE = 0,
109 	STM32_QSPI_CCR_IMODE_ONE_LINE = 1,
110 	STM32_QSPI_CCR_IMODE_TWO_LINE = 2,
111 	STM32_QSPI_CCR_IMODE_FOUR_LINE = 3,
112 };
113 
114 enum STM32_QSPI_CCR_ADMODE {
115 	STM32_QSPI_CCR_ADMODE_NONE = 0,
116 	STM32_QSPI_CCR_ADMODE_ONE_LINE = 1,
117 	STM32_QSPI_CCR_ADMODE_TWO_LINE = 2,
118 	STM32_QSPI_CCR_ADMODE_FOUR_LINE = 3,
119 };
120 
121 enum STM32_QSPI_CCR_ADSIZE {
122 	STM32_QSPI_CCR_ADSIZE_8BIT = 0,
123 	STM32_QSPI_CCR_ADSIZE_16BIT = 1,
124 	STM32_QSPI_CCR_ADSIZE_24BIT = 2,
125 	STM32_QSPI_CCR_ADSIZE_32BIT = 3,
126 };
127 
128 enum STM32_QSPI_CCR_ABMODE {
129 	STM32_QSPI_CCR_ABMODE_NONE = 0,
130 	STM32_QSPI_CCR_ABMODE_ONE_LINE = 1,
131 	STM32_QSPI_CCR_ABMODE_TWO_LINE = 2,
132 	STM32_QSPI_CCR_ABMODE_FOUR_LINE = 3,
133 };
134 
135 enum STM32_QSPI_CCR_ABSIZE {
136 	STM32_QSPI_CCR_ABSIZE_8BIT = 0,
137 	STM32_QSPI_CCR_ABSIZE_16BIT = 1,
138 	STM32_QSPI_CCR_ABSIZE_24BIT = 2,
139 	STM32_QSPI_CCR_ABSIZE_32BIT = 3,
140 };
141 
142 enum STM32_QSPI_CCR_DMODE {
143 	STM32_QSPI_CCR_DMODE_NONE = 0,
144 	STM32_QSPI_CCR_DMODE_ONE_LINE = 1,
145 	STM32_QSPI_CCR_DMODE_TWO_LINE = 2,
146 	STM32_QSPI_CCR_DMODE_FOUR_LINE = 3,
147 };
148 
149 enum STM32_QSPI_CCR_FMODE {
150 	STM32_QSPI_CCR_IND_WRITE = 0,
151 	STM32_QSPI_CCR_IND_READ = 1,
152 	STM32_QSPI_CCR_AUTO_POLL = 2,
153 	STM32_QSPI_CCR_MEM_MAP = 3,
154 };
155 
156 /* default SCK frequency, unit: HZ */
157 #define STM32_QSPI_DEFAULT_SCK_FREQ 108000000
158 
159 struct stm32_qspi_platdata {
160 	u32 base;
161 	u32 memory_map;
162 	u32 max_hz;
163 };
164 
165 struct stm32_qspi_priv {
166 	struct stm32_qspi_regs *regs;
167 	u32 max_hz;
168 	u32 mode;
169 
170 	u32 command;
171 	u32 address;
172 	u32 dummycycles;
173 #define CMD_HAS_ADR	BIT(24)
174 #define CMD_HAS_DUMMY	BIT(25)
175 #define CMD_HAS_DATA	BIT(26)
176 };
177 
178 static void _stm32_qspi_disable(struct stm32_qspi_priv *priv)
179 {
180 	clrbits_le32(&priv->regs->cr, STM32_QSPI_CR_EN);
181 }
182 
183 static void _stm32_qspi_enable(struct stm32_qspi_priv *priv)
184 {
185 	setbits_le32(&priv->regs->cr, STM32_QSPI_CR_EN);
186 }
187 
188 static void _stm32_qspi_wait_for_not_busy(struct stm32_qspi_priv *priv)
189 {
190 	while (readl(&priv->regs->sr) & STM32_QSPI_SR_BUSY)
191 		;
192 }
193 
194 static void _stm32_qspi_wait_for_complete(struct stm32_qspi_priv *priv)
195 {
196 	while (!(readl(&priv->regs->sr) & STM32_QSPI_SR_TCF))
197 		;
198 }
199 
200 static void _stm32_qspi_wait_for_ftf(struct stm32_qspi_priv *priv)
201 {
202 	while (!(readl(&priv->regs->sr) & STM32_QSPI_SR_FTF))
203 		;
204 }
205 
206 static void _stm32_qspi_set_flash_size(struct stm32_qspi_priv *priv, u32 size)
207 {
208 	u32 fsize = fls(size) - 1;
209 	clrsetbits_le32(&priv->regs->dcr,
210 			STM32_QSPI_DCR_FSIZE_MASK << STM32_QSPI_DCR_FSIZE_SHIFT,
211 			fsize << STM32_QSPI_DCR_FSIZE_SHIFT);
212 }
213 
214 static unsigned int _stm32_qspi_gen_ccr(struct stm32_qspi_priv *priv)
215 {
216 	unsigned int ccr_reg = 0;
217 	u8 imode, admode, dmode;
218 	u32 mode = priv->mode;
219 	u32 cmd = (priv->command & STM32_QSPI_CCR_INSTRUCTION_MASK);
220 
221 	imode = STM32_QSPI_CCR_IMODE_ONE_LINE;
222 	admode = STM32_QSPI_CCR_ADMODE_ONE_LINE;
223 
224 	if (mode & SPI_RX_QUAD) {
225 		dmode = STM32_QSPI_CCR_DMODE_FOUR_LINE;
226 		if (mode & SPI_TX_QUAD) {
227 			imode = STM32_QSPI_CCR_IMODE_FOUR_LINE;
228 			admode = STM32_QSPI_CCR_ADMODE_FOUR_LINE;
229 		}
230 	} else if (mode & SPI_RX_DUAL) {
231 		dmode = STM32_QSPI_CCR_DMODE_TWO_LINE;
232 		if (mode & SPI_TX_DUAL) {
233 			imode = STM32_QSPI_CCR_IMODE_TWO_LINE;
234 			admode = STM32_QSPI_CCR_ADMODE_TWO_LINE;
235 		}
236 	} else {
237 		dmode = STM32_QSPI_CCR_DMODE_ONE_LINE;
238 	}
239 
240 	if (priv->command & CMD_HAS_DATA)
241 		ccr_reg |= (dmode << STM32_QSPI_CCR_DMODE_SHIFT);
242 
243 	if (priv->command & CMD_HAS_DUMMY)
244 		ccr_reg |= ((priv->dummycycles & STM32_QSPI_CCR_DCYC_MASK)
245 				<< STM32_QSPI_CCR_DCYC_SHIFT);
246 
247 	if (priv->command & CMD_HAS_ADR) {
248 		ccr_reg |= (STM32_QSPI_CCR_ADSIZE_24BIT
249 				<< STM32_QSPI_CCR_ADSIZE_SHIFT);
250 		ccr_reg |= (admode << STM32_QSPI_CCR_ADMODE_SHIFT);
251 	}
252 	ccr_reg |= (imode << STM32_QSPI_CCR_IMODE_SHIFT);
253 	ccr_reg |= cmd;
254 	return ccr_reg;
255 }
256 
257 static void _stm32_qspi_enable_mmap(struct stm32_qspi_priv *priv,
258 		struct spi_flash *flash)
259 {
260 	priv->command = flash->read_cmd | CMD_HAS_ADR | CMD_HAS_DATA
261 			| CMD_HAS_DUMMY;
262 	priv->dummycycles = flash->dummy_byte * 8;
263 
264 	unsigned int ccr_reg = _stm32_qspi_gen_ccr(priv);
265 	ccr_reg |= (STM32_QSPI_CCR_MEM_MAP << STM32_QSPI_CCR_FMODE_SHIFT);
266 
267 	_stm32_qspi_wait_for_not_busy(priv);
268 
269 	writel(ccr_reg, &priv->regs->ccr);
270 
271 	priv->dummycycles = 0;
272 }
273 
274 static void _stm32_qspi_disable_mmap(struct stm32_qspi_priv *priv)
275 {
276 	setbits_le32(&priv->regs->cr, STM32_QSPI_CR_ABORT);
277 }
278 
279 static void _stm32_qspi_set_xfer_length(struct stm32_qspi_priv *priv,
280 					u32 length)
281 {
282 	writel(length - 1, &priv->regs->dlr);
283 }
284 
285 static void _stm32_qspi_start_xfer(struct stm32_qspi_priv *priv, u32 cr_reg)
286 {
287 	writel(cr_reg, &priv->regs->ccr);
288 
289 	if (priv->command & CMD_HAS_ADR)
290 		writel(priv->address, &priv->regs->ar);
291 }
292 
293 static int _stm32_qspi_xfer(struct stm32_qspi_priv *priv,
294 		struct spi_flash *flash, unsigned int bitlen,
295 		const u8 *dout, u8 *din, unsigned long flags)
296 {
297 	unsigned int words = bitlen / 8;
298 
299 	if (flags & SPI_XFER_MMAP) {
300 		_stm32_qspi_enable_mmap(priv, flash);
301 		return 0;
302 	} else if (flags & SPI_XFER_MMAP_END) {
303 		_stm32_qspi_disable_mmap(priv);
304 		return 0;
305 	}
306 
307 	if (bitlen == 0)
308 		return -1;
309 
310 	if (bitlen % 8) {
311 		debug("spi_xfer: Non byte aligned SPI transfer\n");
312 		return -1;
313 	}
314 
315 	if (dout && din) {
316 		debug("spi_xfer: QSPI cannot have data in and data out set\n");
317 		return -1;
318 	}
319 
320 	if (!dout && (flags & SPI_XFER_BEGIN)) {
321 		debug("spi_xfer: QSPI transfer must begin with command\n");
322 		return -1;
323 	}
324 
325 	if (dout) {
326 		if (flags & SPI_XFER_BEGIN) {
327 			/* data is command */
328 			priv->command = dout[0] | CMD_HAS_DATA;
329 			if (words >= 4) {
330 				/* address is here too */
331 				priv->address = (dout[1] << 16) |
332 						(dout[2] << 8) | dout[3];
333 				priv->command |= CMD_HAS_ADR;
334 			}
335 
336 			if (words > 4) {
337 				/* rest is dummy bytes */
338 				priv->dummycycles = (words - 4) * 8;
339 				priv->command |= CMD_HAS_DUMMY;
340 			}
341 
342 			if (flags & SPI_XFER_END) {
343 				/* command without data */
344 				priv->command &= ~(CMD_HAS_DATA);
345 			}
346 		}
347 
348 		if (flags & SPI_XFER_END) {
349 			u32 ccr_reg = _stm32_qspi_gen_ccr(priv);
350 			ccr_reg |= STM32_QSPI_CCR_IND_WRITE
351 					<< STM32_QSPI_CCR_FMODE_SHIFT;
352 
353 			_stm32_qspi_wait_for_not_busy(priv);
354 
355 			if (priv->command & CMD_HAS_DATA)
356 				_stm32_qspi_set_xfer_length(priv, words);
357 
358 			_stm32_qspi_start_xfer(priv, ccr_reg);
359 
360 			debug("%s: write: ccr:0x%08x adr:0x%08x\n",
361 			      __func__, priv->regs->ccr, priv->regs->ar);
362 
363 			if (priv->command & CMD_HAS_DATA) {
364 				_stm32_qspi_wait_for_ftf(priv);
365 
366 				debug("%s: words:%d data:", __func__, words);
367 
368 				int i = 0;
369 				while (words > i) {
370 					writeb(dout[i], &priv->regs->dr);
371 					debug("%02x ", dout[i]);
372 					i++;
373 				}
374 				debug("\n");
375 
376 				_stm32_qspi_wait_for_complete(priv);
377 			} else {
378 				_stm32_qspi_wait_for_not_busy(priv);
379 			}
380 		}
381 	} else if (din) {
382 		u32 ccr_reg = _stm32_qspi_gen_ccr(priv);
383 		ccr_reg |= STM32_QSPI_CCR_IND_READ
384 				<< STM32_QSPI_CCR_FMODE_SHIFT;
385 
386 		_stm32_qspi_wait_for_not_busy(priv);
387 
388 		_stm32_qspi_set_xfer_length(priv, words);
389 
390 		_stm32_qspi_start_xfer(priv, ccr_reg);
391 
392 		debug("%s: read: ccr:0x%08x adr:0x%08x len:%d\n", __func__,
393 		      priv->regs->ccr, priv->regs->ar, priv->regs->dlr);
394 
395 		debug("%s: data:", __func__);
396 
397 		int i = 0;
398 		while (words > i) {
399 			din[i] = readb(&priv->regs->dr);
400 			debug("%02x ", din[i]);
401 			i++;
402 		}
403 		debug("\n");
404 	}
405 
406 	return 0;
407 }
408 
409 static int stm32_qspi_ofdata_to_platdata(struct udevice *bus)
410 {
411 	struct fdt_resource res_regs, res_mem;
412 	struct stm32_qspi_platdata *plat = bus->platdata;
413 	const void *blob = gd->fdt_blob;
414 	int node = dev_of_offset(bus);
415 	int ret;
416 
417 	ret = fdt_get_named_resource(blob, node, "reg", "reg-names",
418 				     "QuadSPI", &res_regs);
419 	if (ret) {
420 		debug("Error: can't get regs base addresses(ret = %d)!\n", ret);
421 		return -ENOMEM;
422 	}
423 	ret = fdt_get_named_resource(blob, node, "reg", "reg-names",
424 				     "QuadSPI-memory", &res_mem);
425 	if (ret) {
426 		debug("Error: can't get mmap base address(ret = %d)!\n", ret);
427 		return -ENOMEM;
428 	}
429 
430 	plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency",
431 					STM32_QSPI_DEFAULT_SCK_FREQ);
432 
433 	plat->base = res_regs.start;
434 	plat->memory_map = res_mem.start;
435 
436 	debug("%s: regs=<0x%x> mapped=<0x%x>, max-frequency=%d\n",
437 	      __func__,
438 	      plat->base,
439 	      plat->memory_map,
440 	      plat->max_hz
441 	      );
442 
443 	return 0;
444 }
445 
446 static int stm32_qspi_probe(struct udevice *bus)
447 {
448 	struct stm32_qspi_platdata *plat = dev_get_platdata(bus);
449 	struct stm32_qspi_priv *priv = dev_get_priv(bus);
450 	struct dm_spi_bus *dm_spi_bus;
451 
452 	dm_spi_bus = bus->uclass_priv;
453 
454 	dm_spi_bus->max_hz = plat->max_hz;
455 
456 	priv->regs = (struct stm32_qspi_regs *)(uintptr_t)plat->base;
457 
458 	priv->max_hz = plat->max_hz;
459 
460 	clock_setup(QSPI_CLOCK_CFG);
461 
462 	setbits_le32(&priv->regs->cr, STM32_QSPI_CR_SSHIFT);
463 
464 	return 0;
465 }
466 
467 static int stm32_qspi_remove(struct udevice *bus)
468 {
469 	return 0;
470 }
471 
472 static int stm32_qspi_claim_bus(struct udevice *dev)
473 {
474 	struct stm32_qspi_priv *priv;
475 	struct udevice *bus;
476 	struct spi_flash *flash;
477 
478 	bus = dev->parent;
479 	priv = dev_get_priv(bus);
480 	flash = dev_get_uclass_priv(dev);
481 
482 	_stm32_qspi_set_flash_size(priv, flash->size);
483 
484 	_stm32_qspi_enable(priv);
485 
486 	return 0;
487 }
488 
489 static int stm32_qspi_release_bus(struct udevice *dev)
490 {
491 	struct stm32_qspi_priv *priv;
492 	struct udevice *bus;
493 
494 	bus = dev->parent;
495 	priv = dev_get_priv(bus);
496 
497 	_stm32_qspi_disable(priv);
498 
499 	return 0;
500 }
501 
502 static int stm32_qspi_xfer(struct udevice *dev, unsigned int bitlen,
503 		const void *dout, void *din, unsigned long flags)
504 {
505 	struct stm32_qspi_priv *priv;
506 	struct udevice *bus;
507 	struct spi_flash *flash;
508 
509 	bus = dev->parent;
510 	priv = dev_get_priv(bus);
511 	flash = dev_get_uclass_priv(dev);
512 
513 	return _stm32_qspi_xfer(priv, flash, bitlen, (const u8 *)dout,
514 				(u8 *)din, flags);
515 }
516 
517 static int stm32_qspi_set_speed(struct udevice *bus, uint speed)
518 {
519 	struct stm32_qspi_platdata *plat = bus->platdata;
520 	struct stm32_qspi_priv *priv = dev_get_priv(bus);
521 
522 	if (speed > plat->max_hz)
523 		speed = plat->max_hz;
524 
525 	u32 qspi_clk = clock_get(CLOCK_AHB);
526 	u32 prescaler = 255;
527 	if (speed > 0) {
528 		prescaler = DIV_ROUND_UP(qspi_clk, speed) - 1;
529 		if (prescaler > 255)
530 			prescaler = 255;
531 		else if (prescaler < 0)
532 			prescaler = 0;
533 	}
534 
535 	u32 csht = DIV_ROUND_UP((5 * qspi_clk) / (prescaler + 1), 100000000);
536 	csht = (csht - 1) & STM32_QSPI_DCR_CSHT_MASK;
537 
538 	_stm32_qspi_wait_for_not_busy(priv);
539 
540 	clrsetbits_le32(&priv->regs->cr,
541 			STM32_QSPI_CR_PRESCALER_MASK <<
542 			STM32_QSPI_CR_PRESCALER_SHIFT,
543 			prescaler << STM32_QSPI_CR_PRESCALER_SHIFT);
544 
545 
546 	clrsetbits_le32(&priv->regs->dcr,
547 			STM32_QSPI_DCR_CSHT_MASK << STM32_QSPI_DCR_CSHT_SHIFT,
548 			csht << STM32_QSPI_DCR_CSHT_SHIFT);
549 
550 	debug("%s: regs=%p, speed=%d\n", __func__, priv->regs,
551 	      (qspi_clk / (prescaler + 1)));
552 
553 	return 0;
554 }
555 
556 static int stm32_qspi_set_mode(struct udevice *bus, uint mode)
557 {
558 	struct stm32_qspi_priv *priv = dev_get_priv(bus);
559 
560 	_stm32_qspi_wait_for_not_busy(priv);
561 
562 	if ((mode & SPI_CPHA) && (mode & SPI_CPOL))
563 		setbits_le32(&priv->regs->dcr, STM32_QSPI_DCR_CKMODE);
564 	else if (!(mode & SPI_CPHA) && !(mode & SPI_CPOL))
565 		clrbits_le32(&priv->regs->dcr, STM32_QSPI_DCR_CKMODE);
566 	else
567 		return -ENODEV;
568 
569 	if (mode & SPI_CS_HIGH)
570 		return -ENODEV;
571 
572 	if (mode & SPI_RX_QUAD)
573 		priv->mode |= SPI_RX_QUAD;
574 	else if (mode & SPI_RX_DUAL)
575 		priv->mode |= SPI_RX_DUAL;
576 	else
577 		priv->mode &= ~(SPI_RX_QUAD | SPI_RX_DUAL);
578 
579 	if (mode & SPI_TX_QUAD)
580 		priv->mode |= SPI_TX_QUAD;
581 	else if (mode & SPI_TX_DUAL)
582 		priv->mode |= SPI_TX_DUAL;
583 	else
584 		priv->mode &= ~(SPI_TX_QUAD | SPI_TX_DUAL);
585 
586 	debug("%s: regs=%p, mode=%d rx: ", __func__, priv->regs, mode);
587 
588 	if (mode & SPI_RX_QUAD)
589 		debug("quad, tx: ");
590 	else if (mode & SPI_RX_DUAL)
591 		debug("dual, tx: ");
592 	else
593 		debug("single, tx: ");
594 
595 	if (mode & SPI_TX_QUAD)
596 		debug("quad\n");
597 	else if (mode & SPI_TX_DUAL)
598 		debug("dual\n");
599 	else
600 		debug("single\n");
601 
602 	return 0;
603 }
604 
605 static const struct dm_spi_ops stm32_qspi_ops = {
606 	.claim_bus	= stm32_qspi_claim_bus,
607 	.release_bus	= stm32_qspi_release_bus,
608 	.xfer		= stm32_qspi_xfer,
609 	.set_speed	= stm32_qspi_set_speed,
610 	.set_mode	= stm32_qspi_set_mode,
611 };
612 
613 static const struct udevice_id stm32_qspi_ids[] = {
614 	{ .compatible = "st,stm32-qspi" },
615 	{ }
616 };
617 
618 U_BOOT_DRIVER(stm32_qspi) = {
619 	.name	= "stm32_qspi",
620 	.id	= UCLASS_SPI,
621 	.of_match = stm32_qspi_ids,
622 	.ops	= &stm32_qspi_ops,
623 	.ofdata_to_platdata = stm32_qspi_ofdata_to_platdata,
624 	.platdata_auto_alloc_size = sizeof(struct stm32_qspi_platdata),
625 	.priv_auto_alloc_size = sizeof(struct stm32_qspi_priv),
626 	.probe	= stm32_qspi_probe,
627 	.remove = stm32_qspi_remove,
628 };
629