summaryrefslogtreecommitdiff
path: root/drivers/spi/spi-uclass.c
blob: cffd9cf0b0e7d7c5ebd0d3d684ff88b0bb669595 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2014 Google, Inc
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <log.h>
#include <malloc.h>
#include <spi.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>
#include <dm/lists.h>
#include <dm/util.h>

DECLARE_GLOBAL_DATA_PTR;

#define SPI_DEFAULT_SPEED_HZ 100000

static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
{
	struct dm_spi_ops *ops;
	int ret;

	ops = spi_get_ops(bus);
	if (ops->set_speed)
		ret = ops->set_speed(bus, speed);
	else
		ret = -EINVAL;
	if (ret) {
		printf("Cannot set speed (err=%d)\n", ret);
		return ret;
	}

	if (ops->set_mode)
		ret = ops->set_mode(bus, mode);
	else
		ret = -EINVAL;
	if (ret) {
		printf("Cannot set mode (err=%d)\n", ret);
		return ret;
	}

	return 0;
}

int dm_spi_claim_bus(struct udevice *dev)
{
	struct udevice *bus = dev->parent;
	struct dm_spi_ops *ops = spi_get_ops(bus);
	struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
	struct spi_slave *slave = dev_get_parent_priv(dev);
	int speed;

	speed = slave->max_hz;
	if (spi->max_hz) {
		if (speed)
			speed = min(speed, (int)spi->max_hz);
		else
			speed = spi->max_hz;
	}
	if (!speed)
		speed = SPI_DEFAULT_SPEED_HZ;
	if (speed != slave->speed) {
		int ret = spi_set_speed_mode(bus, speed, slave->mode);

		if (ret)
			return log_ret(ret);
		slave->speed = speed;
	}

	return log_ret(ops->claim_bus ? ops->claim_bus(dev) : 0);
}

void dm_spi_release_bus(struct udevice *dev)
{
	struct udevice *bus = dev->parent;
	struct dm_spi_ops *ops = spi_get_ops(bus);

	if (ops->release_bus)
		ops->release_bus(dev);
}

int dm_spi_xfer(struct udevice *dev, unsigned int bitlen,
		const void *dout, void *din, unsigned long flags)
{
	struct udevice *bus = dev->parent;
	struct dm_spi_ops *ops = spi_get_ops(bus);

	if (bus->uclass->uc_drv->id != UCLASS_SPI)
		return -EOPNOTSUPP;
	if (!ops->xfer)
		return -ENOSYS;

	return ops->xfer(dev, bitlen, dout, din, flags);
}

int dm_spi_get_mmap(struct udevice *dev, ulong *map_basep, uint *map_sizep,
		    uint *offsetp)
{
	struct udevice *bus = dev->parent;
	struct dm_spi_ops *ops = spi_get_ops(bus);

	if (bus->uclass->uc_drv->id != UCLASS_SPI)
		return -EOPNOTSUPP;
	if (!ops->get_mmap)
		return -ENOSYS;

	return ops->get_mmap(dev, map_basep, map_sizep, offsetp);
}

int spi_claim_bus(struct spi_slave *slave)
{
	return log_ret(dm_spi_claim_bus(slave->dev));
}

void spi_release_bus(struct spi_slave *slave)
{
	dm_spi_release_bus(slave->dev);
}

int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
	     const void *dout, void *din, unsigned long flags)
{
	return dm_spi_xfer(slave->dev, bitlen, dout, din, flags);
}

int spi_write_then_read(struct spi_slave *slave, const u8 *opcode,
			size_t n_opcode, const u8 *txbuf, u8 *rxbuf,
			size_t n_buf)
{
	unsigned long flags = SPI_XFER_BEGIN;
	int ret;

	if (n_buf == 0)
		flags |= SPI_XFER_END;

	ret = spi_xfer(slave, n_opcode * 8, opcode, NULL, flags);
	if (ret) {
		debug("spi: failed to send command (%zu bytes): %d\n",
		      n_opcode, ret);
	} else if (n_buf != 0) {
		ret = spi_xfer(slave, n_buf * 8, txbuf, rxbuf, SPI_XFER_END);
		if (ret)
			debug("spi: failed to transfer %zu bytes of data: %d\n",
			      n_buf, ret);
	}

	return ret;
}

#if !CONFIG_IS_ENABLED(OF_PLATDATA)
static int spi_child_post_bind(struct udevice *dev)
{
	struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);

	if (!dev_of_valid(dev))
		return 0;

	return spi_slave_ofdata_to_platdata(dev, plat);
}
#endif

static int spi_post_probe(struct udevice *bus)
{
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
	struct dm_spi_bus *spi = dev_get_uclass_priv(bus);

	spi->max_hz = dev_read_u32_default(bus, "spi-max-frequency", 0);
#endif
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
	struct dm_spi_ops *ops = spi_get_ops(bus);
	static int reloc_done;

	if (!reloc_done) {
		if (ops->claim_bus)
			ops->claim_bus += gd->reloc_off;
		if (ops->release_bus)
			ops->release_bus += gd->reloc_off;
		if (ops->set_wordlen)
			ops->set_wordlen += gd->reloc_off;
		if (ops->xfer)
			ops->xfer += gd->reloc_off;
		if (ops->set_speed)
			ops->set_speed += gd->reloc_off;
		if (ops->set_mode)
			ops->set_mode += gd->reloc_off;
		if (ops->cs_info)
			ops->cs_info += gd->reloc_off;
		reloc_done++;
	}
#endif

	return 0;
}

static int spi_child_pre_probe(struct udevice *dev)
{
	struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
	struct spi_slave *slave = dev_get_parent_priv(dev);

	/*
	 * This is needed because we pass struct spi_slave around the place
	 * instead slave->dev (a struct udevice). So we have to have some
	 * way to access the slave udevice given struct spi_slave. Once we
	 * change the SPI API to use udevice instead of spi_slave, we can
	 * drop this.
	 */
	slave->dev = dev;

	slave->max_hz = plat->max_hz;
	slave->mode = plat->mode;
	slave->wordlen = SPI_DEFAULT_WORDLEN;

	return 0;
}

int spi_chip_select(struct udevice *dev)
{
	struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);

	return plat ? plat->cs : -ENOENT;
}

int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
{
	struct dm_spi_ops *ops;
	struct spi_cs_info info;
	struct udevice *dev;
	int ret;

	/*
	 * Ask the driver. For the moment we don't have CS info.
	 * When we do we could provide the driver with a helper function
	 * to figure out what chip selects are valid, or just handle the
	 * request.
	 */
	ops = spi_get_ops(bus);
	if (ops->cs_info) {
		ret = ops->cs_info(bus, cs, &info);
	} else {
		/*
		 * We could assume there is at least one valid chip select.
		 * The driver didn't care enough to tell us.
		 */
		ret = 0;
	}

	if (ret) {
		printf("Invalid cs %d (err=%d)\n", cs, ret);
		return ret;
	}

	for (device_find_first_child(bus, &dev); dev;
	     device_find_next_child(&dev)) {
		struct dm_spi_slave_platdata *plat;

		plat = dev_get_parent_platdata(dev);
		debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
		if (plat->cs == cs) {
			*devp = dev;
			return 0;
		}
	}

	return -ENODEV;
}

int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
{
	struct spi_cs_info info;
	struct udevice *bus;
	int ret;

	ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
	if (ret) {
		debug("%s: No bus %d\n", __func__, busnum);
		return ret;
	}

	return spi_cs_info(bus, cs, &info);
}

int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
{
	struct spi_cs_info local_info;
	int ret;

	if (!info)
		info = &local_info;

	/* If there is a device attached, return it */
	info->dev = NULL;
	ret = spi_find_chip_select(bus, cs, &info->dev);
	return ret == -ENODEV ? 0 : ret;
}

int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
			struct udevice **devp)
{
	struct udevice *bus, *dev;
	int ret;

	ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
	if (ret) {
		debug("%s: No bus %d\n", __func__, busnum);
		return ret;
	}
	ret = spi_find_chip_select(bus, cs, &dev);
	if (ret) {
		debug("%s: No cs %d\n", __func__, cs);
		return ret;
	}
	*busp = bus;
	*devp = dev;

	return ret;
}

int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
		       const char *drv_name, const char *dev_name,
		       struct udevice **busp, struct spi_slave **devp)
{
	struct udevice *bus, *dev;
	struct dm_spi_slave_platdata *plat;
	struct spi_slave *slave;
	bool created = false;
	int ret;

#if CONFIG_IS_ENABLED(OF_PLATDATA)
	ret = uclass_first_device_err(UCLASS_SPI, &bus);
#else
	ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
#endif
	if (ret) {
		printf("Invalid bus %d (err=%d)\n", busnum, ret);
		return ret;
	}
	ret = spi_find_chip_select(bus, cs, &dev);

	/*
	 * If there is no such device, create one automatically. This means
	 * that we don't need a device tree node or platform data for the
	 * SPI flash chip - we will bind to the correct driver.
	 */
	if (ret == -ENODEV && drv_name) {
		debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
		      __func__, dev_name, busnum, cs, drv_name);
		ret = device_bind_driver(bus, drv_name, dev_name, &dev);
		if (ret) {
			debug("%s: Unable to bind driver (ret=%d)\n", __func__,
			      ret);
			return ret;
		}
		plat = dev_get_parent_platdata(dev);
		plat->cs = cs;
		if (speed) {
			plat->max_hz = speed;
		} else {
			printf("Warning: SPI speed fallback to %u kHz\n",
			       SPI_DEFAULT_SPEED_HZ / 1000);
			plat->max_hz = SPI_DEFAULT_SPEED_HZ;
		}
		plat->mode = mode;
		created = true;
	} else if (ret) {
		printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
		       ret);
		return ret;
	}

	if (!device_active(dev)) {
		struct spi_slave *slave;

		ret = device_probe(dev);
		if (ret)
			goto err;
		slave = dev_get_parent_priv(dev);
		slave->dev = dev;
	}

	slave = dev_get_parent_priv(dev);

	/*
	 * In case the operation speed is not yet established by
	 * dm_spi_claim_bus() ensure the bus is configured properly.
	 */
	if (!slave->speed) {
		ret = spi_claim_bus(slave);
		if (ret)
			goto err;
	}

	*busp = bus;
	*devp = slave;
	debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);

	return 0;

err:
	debug("%s: Error path, created=%d, device '%s'\n", __func__,
	      created, dev->name);
	if (created) {
		device_remove(dev, DM_REMOVE_NORMAL);
		device_unbind(dev);
	}

	return ret;
}

/* Compatibility function - to be removed */
struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
				  unsigned int speed, unsigned int mode)
{
	struct spi_slave *slave;
	struct udevice *dev;
	int ret;

	ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
				 &slave);
	if (ret)
		return NULL;

	return slave;
}

void spi_free_slave(struct spi_slave *slave)
{
	device_remove(slave->dev, DM_REMOVE_NORMAL);
	slave->dev = NULL;
}

int spi_slave_ofdata_to_platdata(struct udevice *dev,
				 struct dm_spi_slave_platdata *plat)
{
	int mode = 0;
	int value;

	plat->cs = dev_read_u32_default(dev, "reg", -1);
	plat->max_hz = dev_read_u32_default(dev, "spi-max-frequency",
					    SPI_DEFAULT_SPEED_HZ);
	if (dev_read_bool(dev, "spi-cpol"))
		mode |= SPI_CPOL;
	if (dev_read_bool(dev, "spi-cpha"))
		mode |= SPI_CPHA;
	if (dev_read_bool(dev, "spi-cs-high"))
		mode |= SPI_CS_HIGH;
	if (dev_read_bool(dev, "spi-3wire"))
		mode |= SPI_3WIRE;
	if (dev_read_bool(dev, "spi-half-duplex"))
		mode |= SPI_PREAMBLE;

	/* Device DUAL/QUAD mode */
	value = dev_read_u32_default(dev, "spi-tx-bus-width", 1);
	switch (value) {
	case 1:
		break;
	case 2:
		mode |= SPI_TX_DUAL;
		break;
	case 4:
		mode |= SPI_TX_QUAD;
		break;
	case 8:
		mode |= SPI_TX_OCTAL;
		break;
	default:
		warn_non_spl("spi-tx-bus-width %d not supported\n", value);
		break;
	}

	value = dev_read_u32_default(dev, "spi-rx-bus-width", 1);
	switch (value) {
	case 1:
		break;
	case 2:
		mode |= SPI_RX_DUAL;
		break;
	case 4:
		mode |= SPI_RX_QUAD;
		break;
	case 8:
		mode |= SPI_RX_OCTAL;
		break;
	default:
		warn_non_spl("spi-rx-bus-width %d not supported\n", value);
		break;
	}

	plat->mode = mode;

	return 0;
}

UCLASS_DRIVER(spi) = {
	.id		= UCLASS_SPI,
	.name		= "spi",
	.flags		= DM_UC_FLAG_SEQ_ALIAS,
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
	.post_bind	= dm_scan_fdt_dev,
#endif
	.post_probe	= spi_post_probe,
	.child_pre_probe = spi_child_pre_probe,
	.per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
	.per_child_auto_alloc_size = sizeof(struct spi_slave),
	.per_child_platdata_auto_alloc_size =
			sizeof(struct dm_spi_slave_platdata),
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
	.child_post_bind = spi_child_post_bind,
#endif
};

UCLASS_DRIVER(spi_generic) = {
	.id		= UCLASS_SPI_GENERIC,
	.name		= "spi_generic",
};

U_BOOT_DRIVER(spi_generic_drv) = {
	.name		= "spi_generic_drv",
	.id		= UCLASS_SPI_GENERIC,
};