summaryrefslogtreecommitdiff
path: root/drivers/spi/zynq_qspi.c
blob: 9ad1927a5d51f0bcdf783096fe73086c2de8e0f1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2013 Xilinx, Inc.
 * (C) Copyright 2015 Jagan Teki <jteki@openedev.com>
 *
 * Xilinx Zynq Quad-SPI(QSPI) controller driver (master mode only)
 */

#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <spi.h>
#include <asm/io.h>

DECLARE_GLOBAL_DATA_PTR;

/* zynq qspi register bit masks ZYNQ_QSPI_<REG>_<BIT>_MASK */
#define ZYNQ_QSPI_CR_IFMODE_MASK	BIT(31)	/* Flash intrface mode*/
#define ZYNQ_QSPI_CR_MSA_MASK		BIT(15)	/* Manual start enb */
#define ZYNQ_QSPI_CR_MCS_MASK		BIT(14)	/* Manual chip select */
#define ZYNQ_QSPI_CR_PCS_MASK		BIT(10)	/* Peri chip select */
#define ZYNQ_QSPI_CR_FW_MASK		GENMASK(7, 6)	/* FIFO width */
#define ZYNQ_QSPI_CR_SS_MASK		GENMASK(13, 10)	/* Slave Select */
#define ZYNQ_QSPI_CR_BAUD_MASK		GENMASK(5, 3)	/* Baud rate div */
#define ZYNQ_QSPI_CR_CPHA_MASK		BIT(2)	/* Clock phase */
#define ZYNQ_QSPI_CR_CPOL_MASK		BIT(1)	/* Clock polarity */
#define ZYNQ_QSPI_CR_MSTREN_MASK	BIT(0)	/* Mode select */
#define ZYNQ_QSPI_IXR_RXNEMPTY_MASK	BIT(4)	/* RX_FIFO_not_empty */
#define ZYNQ_QSPI_IXR_TXOW_MASK		BIT(2)	/* TX_FIFO_not_full */
#define ZYNQ_QSPI_IXR_ALL_MASK		GENMASK(6, 0)	/* All IXR bits */
#define ZYNQ_QSPI_ENR_SPI_EN_MASK	BIT(0)	/* SPI Enable */
#define ZYNQ_QSPI_LQSPICFG_LQMODE_MASK	BIT(31) /* Linear QSPI Mode */

/* zynq qspi Transmit Data Register */
#define ZYNQ_QSPI_TXD_00_00_OFFSET	0x1C	/* Transmit 4-byte inst */
#define ZYNQ_QSPI_TXD_00_01_OFFSET	0x80	/* Transmit 1-byte inst */
#define ZYNQ_QSPI_TXD_00_10_OFFSET	0x84	/* Transmit 2-byte inst */
#define ZYNQ_QSPI_TXD_00_11_OFFSET	0x88	/* Transmit 3-byte inst */

#define ZYNQ_QSPI_TXFIFO_THRESHOLD	1	/* Tx FIFO threshold level*/
#define ZYNQ_QSPI_RXFIFO_THRESHOLD	32	/* Rx FIFO threshold level */

#define ZYNQ_QSPI_CR_BAUD_MAX		8	/* Baud rate divisor max val */
#define ZYNQ_QSPI_CR_BAUD_SHIFT		3	/* Baud rate divisor shift */
#define ZYNQ_QSPI_CR_SS_SHIFT		10	/* Slave select shift */

#define ZYNQ_QSPI_FIFO_DEPTH		63
#ifndef CONFIG_SYS_ZYNQ_QSPI_WAIT
#define CONFIG_SYS_ZYNQ_QSPI_WAIT	CONFIG_SYS_HZ/100	/* 10 ms */
#endif

/* zynq qspi register set */
struct zynq_qspi_regs {
	u32 cr;		/* 0x00 */
	u32 isr;	/* 0x04 */
	u32 ier;	/* 0x08 */
	u32 idr;	/* 0x0C */
	u32 imr;	/* 0x10 */
	u32 enr;	/* 0x14 */
	u32 dr;		/* 0x18 */
	u32 txd0r;	/* 0x1C */
	u32 drxr;	/* 0x20 */
	u32 sicr;	/* 0x24 */
	u32 txftr;	/* 0x28 */
	u32 rxftr;	/* 0x2C */
	u32 gpior;	/* 0x30 */
	u32 reserved0[19];
	u32 txd1r;	/* 0x80 */
	u32 txd2r;	/* 0x84 */
	u32 txd3r;	/* 0x88 */
	u32 reserved1[5];
	u32 lqspicfg;	/* 0xA0 */
	u32 lqspists;	/* 0xA4 */
};

/* zynq qspi platform data */
struct zynq_qspi_platdata {
	struct zynq_qspi_regs *regs;
	u32 frequency;          /* input frequency */
	u32 speed_hz;
};

/* zynq qspi priv */
struct zynq_qspi_priv {
	struct zynq_qspi_regs *regs;
	u8 cs;
	u8 mode;
	u8 fifo_depth;
	u32 freq;		/* required frequency */
	const void *tx_buf;
	void *rx_buf;
	unsigned len;
	int bytes_to_transfer;
	int bytes_to_receive;
	unsigned int is_inst;
	unsigned cs_change:1;
};

static int zynq_qspi_ofdata_to_platdata(struct udevice *bus)
{
	struct zynq_qspi_platdata *plat = bus->platdata;
	const void *blob = gd->fdt_blob;
	int node = dev_of_offset(bus);

	plat->regs = (struct zynq_qspi_regs *)fdtdec_get_addr(blob,
							      node, "reg");

	/* FIXME: Use 166MHz as a suitable default */
	plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
					166666666);
	plat->speed_hz = plat->frequency / 2;

	debug("%s: regs=%p max-frequency=%d\n", __func__,
	      plat->regs, plat->frequency);

	return 0;
}

static void zynq_qspi_init_hw(struct zynq_qspi_priv *priv)
{
	struct zynq_qspi_regs *regs = priv->regs;
	u32 confr;

	/* Disable QSPI */
	writel(~ZYNQ_QSPI_ENR_SPI_EN_MASK, &regs->enr);

	/* Disable Interrupts */
	writel(ZYNQ_QSPI_IXR_ALL_MASK, &regs->idr);

	/* Clear the TX and RX threshold reg */
	writel(ZYNQ_QSPI_TXFIFO_THRESHOLD, &regs->txftr);
	writel(ZYNQ_QSPI_RXFIFO_THRESHOLD, &regs->rxftr);

	/* Clear the RX FIFO */
	while (readl(&regs->isr) & ZYNQ_QSPI_IXR_RXNEMPTY_MASK)
		readl(&regs->drxr);

	/* Clear Interrupts */
	writel(ZYNQ_QSPI_IXR_ALL_MASK, &regs->isr);

	/* Manual slave select and Auto start */
	confr = readl(&regs->cr);
	confr &= ~ZYNQ_QSPI_CR_MSA_MASK;
	confr |= ZYNQ_QSPI_CR_IFMODE_MASK | ZYNQ_QSPI_CR_MCS_MASK |
		ZYNQ_QSPI_CR_PCS_MASK | ZYNQ_QSPI_CR_FW_MASK |
		ZYNQ_QSPI_CR_MSTREN_MASK;
	writel(confr, &regs->cr);

	/* Disable the LQSPI feature */
	confr = readl(&regs->lqspicfg);
	confr &= ~ZYNQ_QSPI_LQSPICFG_LQMODE_MASK;
	writel(confr, &regs->lqspicfg);

	/* Enable SPI */
	writel(ZYNQ_QSPI_ENR_SPI_EN_MASK, &regs->enr);
}

static int zynq_qspi_probe(struct udevice *bus)
{
	struct zynq_qspi_platdata *plat = dev_get_platdata(bus);
	struct zynq_qspi_priv *priv = dev_get_priv(bus);

	priv->regs = plat->regs;
	priv->fifo_depth = ZYNQ_QSPI_FIFO_DEPTH;

	/* init the zynq spi hw */
	zynq_qspi_init_hw(priv);

	return 0;
}

/*
 * zynq_qspi_read_data - Copy data to RX buffer
 * @zqspi:	Pointer to the zynq_qspi structure
 * @data:	The 32 bit variable where data is stored
 * @size:	Number of bytes to be copied from data to RX buffer
 */
static void zynq_qspi_read_data(struct zynq_qspi_priv *priv, u32 data, u8 size)
{
	u8 byte3;

	debug("%s: data 0x%04x rx_buf addr: 0x%08x size %d\n", __func__ ,
	      data, (unsigned)(priv->rx_buf), size);

	if (priv->rx_buf) {
		switch (size) {
		case 1:
			*((u8 *)priv->rx_buf) = data;
			priv->rx_buf += 1;
			break;
		case 2:
			*((u16 *)priv->rx_buf) = data;
			priv->rx_buf += 2;
			break;
		case 3:
			*((u16 *)priv->rx_buf) = data;
			priv->rx_buf += 2;
			byte3 = (u8)(data >> 16);
			*((u8 *)priv->rx_buf) = byte3;
			priv->rx_buf += 1;
			break;
		case 4:
			/* Can not assume word aligned buffer */
			memcpy(priv->rx_buf, &data, size);
			priv->rx_buf += 4;
			break;
		default:
			/* This will never execute */
			break;
		}
	}
	priv->bytes_to_receive -= size;
	if (priv->bytes_to_receive < 0)
		priv->bytes_to_receive = 0;
}

/*
 * zynq_qspi_write_data - Copy data from TX buffer
 * @zqspi:	Pointer to the zynq_qspi structure
 * @data:	Pointer to the 32 bit variable where data is to be copied
 * @size:	Number of bytes to be copied from TX buffer to data
 */
static void zynq_qspi_write_data(struct  zynq_qspi_priv *priv,
		u32 *data, u8 size)
{
	if (priv->tx_buf) {
		switch (size) {
		case 1:
			*data = *((u8 *)priv->tx_buf);
			priv->tx_buf += 1;
			*data |= 0xFFFFFF00;
			break;
		case 2:
			*data = *((u16 *)priv->tx_buf);
			priv->tx_buf += 2;
			*data |= 0xFFFF0000;
			break;
		case 3:
			*data = *((u16 *)priv->tx_buf);
			priv->tx_buf += 2;
			*data |= (*((u8 *)priv->tx_buf) << 16);
			priv->tx_buf += 1;
			*data |= 0xFF000000;
			break;
		case 4:
			/* Can not assume word aligned buffer */
			memcpy(data, priv->tx_buf, size);
			priv->tx_buf += 4;
			break;
		default:
			/* This will never execute */
			break;
		}
	} else {
		*data = 0;
	}

	debug("%s: data 0x%08x tx_buf addr: 0x%08x size %d\n", __func__,
	      *data, (u32)priv->tx_buf, size);

	priv->bytes_to_transfer -= size;
	if (priv->bytes_to_transfer < 0)
		priv->bytes_to_transfer = 0;
}

static void zynq_qspi_chipselect(struct  zynq_qspi_priv *priv, int is_on)
{
	u32 confr;
	struct zynq_qspi_regs *regs = priv->regs;

	confr = readl(&regs->cr);

	if (is_on) {
		/* Select the slave */
		confr &= ~ZYNQ_QSPI_CR_SS_MASK;
		confr |= (~(1 << priv->cs) << ZYNQ_QSPI_CR_SS_SHIFT) &
					ZYNQ_QSPI_CR_SS_MASK;
	} else
		/* Deselect the slave */
		confr |= ZYNQ_QSPI_CR_SS_MASK;

	writel(confr, &regs->cr);
}

/*
 * zynq_qspi_fill_tx_fifo - Fills the TX FIFO with as many bytes as possible
 * @zqspi:	Pointer to the zynq_qspi structure
 */
static void zynq_qspi_fill_tx_fifo(struct zynq_qspi_priv *priv, u32 size)
{
	u32 data = 0;
	u32 fifocount = 0;
	unsigned len, offset;
	struct zynq_qspi_regs *regs = priv->regs;
	static const unsigned offsets[4] = {
		ZYNQ_QSPI_TXD_00_00_OFFSET, ZYNQ_QSPI_TXD_00_01_OFFSET,
		ZYNQ_QSPI_TXD_00_10_OFFSET, ZYNQ_QSPI_TXD_00_11_OFFSET };

	while ((fifocount < size) &&
			(priv->bytes_to_transfer > 0)) {
		if (priv->bytes_to_transfer >= 4) {
			if (priv->tx_buf) {
				memcpy(&data, priv->tx_buf, 4);
				priv->tx_buf += 4;
			} else {
				data = 0;
			}
			writel(data, &regs->txd0r);
			priv->bytes_to_transfer -= 4;
			fifocount++;
		} else {
			/* Write TXD1, TXD2, TXD3 only if TxFIFO is empty. */
			if (!(readl(&regs->isr)
					& ZYNQ_QSPI_IXR_TXOW_MASK) &&
					!priv->rx_buf)
				return;
			len = priv->bytes_to_transfer;
			zynq_qspi_write_data(priv, &data, len);
			offset = (priv->rx_buf) ? offsets[0] : offsets[len];
			writel(data, &regs->cr + (offset / 4));
		}
	}
}

/*
 * zynq_qspi_irq_poll - Interrupt service routine of the QSPI controller
 * @zqspi:	Pointer to the zynq_qspi structure
 *
 * This function handles TX empty and Mode Fault interrupts only.
 * On TX empty interrupt this function reads the received data from RX FIFO and
 * fills the TX FIFO if there is any data remaining to be transferred.
 * On Mode Fault interrupt this function indicates that transfer is completed,
 * the SPI subsystem will identify the error as the remaining bytes to be
 * transferred is non-zero.
 *
 * returns:	0 for poll timeout
 *		1 transfer operation complete
 */
static int zynq_qspi_irq_poll(struct zynq_qspi_priv *priv)
{
	struct zynq_qspi_regs *regs = priv->regs;
	u32 rxindex = 0;
	u32 rxcount;
	u32 status, timeout;

	/* Poll until any of the interrupt status bits are set */
	timeout = get_timer(0);
	do {
		status = readl(&regs->isr);
	} while ((status == 0) &&
		(get_timer(timeout) < CONFIG_SYS_ZYNQ_QSPI_WAIT));

	if (status == 0) {
		printf("zynq_qspi_irq_poll: Timeout!\n");
		return -ETIMEDOUT;
	}

	writel(status, &regs->isr);

	/* Disable all interrupts */
	writel(ZYNQ_QSPI_IXR_ALL_MASK, &regs->idr);
	if ((status & ZYNQ_QSPI_IXR_TXOW_MASK) ||
	    (status & ZYNQ_QSPI_IXR_RXNEMPTY_MASK)) {
		/*
		 * This bit is set when Tx FIFO has < THRESHOLD entries. We have
		 * the THRESHOLD value set to 1, so this bit indicates Tx FIFO
		 * is empty
		 */
		rxcount = priv->bytes_to_receive - priv->bytes_to_transfer;
		rxcount = (rxcount % 4) ? ((rxcount/4)+1) : (rxcount/4);
		while ((rxindex < rxcount) &&
				(rxindex < ZYNQ_QSPI_RXFIFO_THRESHOLD)) {
			/* Read out the data from the RX FIFO */
			u32 data;
			data = readl(&regs->drxr);

			if (priv->bytes_to_receive >= 4) {
				if (priv->rx_buf) {
					memcpy(priv->rx_buf, &data, 4);
					priv->rx_buf += 4;
				}
				priv->bytes_to_receive -= 4;
			} else {
				zynq_qspi_read_data(priv, data,
						    priv->bytes_to_receive);
			}
			rxindex++;
		}

		if (priv->bytes_to_transfer) {
			/* There is more data to send */
			zynq_qspi_fill_tx_fifo(priv,
					       ZYNQ_QSPI_RXFIFO_THRESHOLD);

			writel(ZYNQ_QSPI_IXR_ALL_MASK, &regs->ier);
		} else {
			/*
			 * If transfer and receive is completed then only send
			 * complete signal
			 */
			if (!priv->bytes_to_receive) {
				/* return operation complete */
				writel(ZYNQ_QSPI_IXR_ALL_MASK,
				       &regs->idr);
				return 1;
			}
		}
	}

	return 0;
}

/*
 * zynq_qspi_start_transfer - Initiates the QSPI transfer
 * @qspi:	Pointer to the spi_device structure
 * @transfer:	Pointer to the spi_transfer structure which provide information
 *		about next transfer parameters
 *
 * This function fills the TX FIFO, starts the QSPI transfer, and waits for the
 * transfer to be completed.
 *
 * returns:	Number of bytes transferred in the last transfer
 */
static int zynq_qspi_start_transfer(struct zynq_qspi_priv *priv)
{
	u32 data = 0;
	struct zynq_qspi_regs *regs = priv->regs;

	debug("%s: qspi: 0x%08x transfer: 0x%08x len: %d\n", __func__,
	      (u32)priv, (u32)priv, priv->len);

	priv->bytes_to_transfer = priv->len;
	priv->bytes_to_receive = priv->len;

	if (priv->len < 4)
		zynq_qspi_fill_tx_fifo(priv, priv->len);
	else
		zynq_qspi_fill_tx_fifo(priv, priv->fifo_depth);

	writel(ZYNQ_QSPI_IXR_ALL_MASK, &regs->ier);

	/* wait for completion */
	do {
		data = zynq_qspi_irq_poll(priv);
	} while (data == 0);

	return (priv->len) - (priv->bytes_to_transfer);
}

static int zynq_qspi_transfer(struct zynq_qspi_priv *priv)
{
	unsigned cs_change = 1;
	int status = 0;

	while (1) {
		/* Select the chip if required */
		if (cs_change)
			zynq_qspi_chipselect(priv, 1);

		cs_change = priv->cs_change;

		if (!priv->tx_buf && !priv->rx_buf && priv->len) {
			status = -1;
			break;
		}

		/* Request the transfer */
		if (priv->len) {
			status = zynq_qspi_start_transfer(priv);
			priv->is_inst = 0;
		}

		if (status != priv->len) {
			if (status > 0)
				status = -EMSGSIZE;
			debug("zynq_qspi_transfer:%d len:%d\n",
			      status, priv->len);
			break;
		}
		status = 0;

		if (cs_change)
			/* Deselect the chip */
			zynq_qspi_chipselect(priv, 0);

		break;
	}

	return status;
}

static int zynq_qspi_claim_bus(struct udevice *dev)
{
	struct udevice *bus = dev->parent;
	struct zynq_qspi_priv *priv = dev_get_priv(bus);
	struct zynq_qspi_regs *regs = priv->regs;

	writel(ZYNQ_QSPI_ENR_SPI_EN_MASK, &regs->enr);

	return 0;
}

static int zynq_qspi_release_bus(struct udevice *dev)
{
	struct udevice *bus = dev->parent;
	struct zynq_qspi_priv *priv = dev_get_priv(bus);
	struct zynq_qspi_regs *regs = priv->regs;

	writel(~ZYNQ_QSPI_ENR_SPI_EN_MASK, &regs->enr);

	return 0;
}

static int zynq_qspi_xfer(struct udevice *dev, unsigned int bitlen,
		const void *dout, void *din, unsigned long flags)
{
	struct udevice *bus = dev->parent;
	struct zynq_qspi_priv *priv = dev_get_priv(bus);
	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);

	priv->cs = slave_plat->cs;
	priv->tx_buf = dout;
	priv->rx_buf = din;
	priv->len = bitlen / 8;

	debug("zynq_qspi_xfer: bus:%i cs:%i bitlen:%i len:%i flags:%lx\n",
	      bus->seq, slave_plat->cs, bitlen, priv->len, flags);

	/*
	 * Festering sore.
	 * Assume that the beginning of a transfer with bits to
	 * transmit must contain a device command.
	 */
	if (dout && flags & SPI_XFER_BEGIN)
		priv->is_inst = 1;
	else
		priv->is_inst = 0;

	if (flags & SPI_XFER_END)
		priv->cs_change = 1;
	else
		priv->cs_change = 0;

	zynq_qspi_transfer(priv);

	return 0;
}

static int zynq_qspi_set_speed(struct udevice *bus, uint speed)
{
	struct zynq_qspi_platdata *plat = bus->platdata;
	struct zynq_qspi_priv *priv = dev_get_priv(bus);
	struct zynq_qspi_regs *regs = priv->regs;
	uint32_t confr;
	u8 baud_rate_val = 0;

	if (speed > plat->frequency)
		speed = plat->frequency;

	/* Set the clock frequency */
	confr = readl(&regs->cr);
	if (speed == 0) {
		/* Set baudrate x8, if the freq is 0 */
		baud_rate_val = 0x2;
	} else if (plat->speed_hz != speed) {
		while ((baud_rate_val < ZYNQ_QSPI_CR_BAUD_MAX) &&
		       ((plat->frequency /
		       (2 << baud_rate_val)) > speed))
			baud_rate_val++;

		plat->speed_hz = speed / (2 << baud_rate_val);
	}
	confr &= ~ZYNQ_QSPI_CR_BAUD_MASK;
	confr |= (baud_rate_val << ZYNQ_QSPI_CR_BAUD_SHIFT);

	writel(confr, &regs->cr);
	priv->freq = speed;

	debug("%s: regs=%p, speed=%d\n", __func__, priv->regs, priv->freq);

	return 0;
}

static int zynq_qspi_set_mode(struct udevice *bus, uint mode)
{
	struct zynq_qspi_priv *priv = dev_get_priv(bus);
	struct zynq_qspi_regs *regs = priv->regs;
	uint32_t confr;

	/* Set the SPI Clock phase and polarities */
	confr = readl(&regs->cr);
	confr &= ~(ZYNQ_QSPI_CR_CPHA_MASK | ZYNQ_QSPI_CR_CPOL_MASK);

	if (mode & SPI_CPHA)
		confr |= ZYNQ_QSPI_CR_CPHA_MASK;
	if (mode & SPI_CPOL)
		confr |= ZYNQ_QSPI_CR_CPOL_MASK;

	writel(confr, &regs->cr);
	priv->mode = mode;

	debug("%s: regs=%p, mode=%d\n", __func__, priv->regs, priv->mode);

	return 0;
}

static const struct dm_spi_ops zynq_qspi_ops = {
	.claim_bus      = zynq_qspi_claim_bus,
	.release_bus    = zynq_qspi_release_bus,
	.xfer           = zynq_qspi_xfer,
	.set_speed      = zynq_qspi_set_speed,
	.set_mode       = zynq_qspi_set_mode,
};

static const struct udevice_id zynq_qspi_ids[] = {
	{ .compatible = "xlnx,zynq-qspi-1.0" },
	{ }
};

U_BOOT_DRIVER(zynq_qspi) = {
	.name   = "zynq_qspi",
	.id     = UCLASS_SPI,
	.of_match = zynq_qspi_ids,
	.ops    = &zynq_qspi_ops,
	.ofdata_to_platdata = zynq_qspi_ofdata_to_platdata,
	.platdata_auto_alloc_size = sizeof(struct zynq_qspi_platdata),
	.priv_auto_alloc_size = sizeof(struct zynq_qspi_priv),
	.probe  = zynq_qspi_probe,
};