blob: 247abfa72ba1c28f904bd8df846df2e17464e441 [file] [log] [blame]
Simon Glassd7af6a42014-10-13 23:41:52 -06001/*
2 * Copyright (c) 2014 Google, Inc
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <dm.h>
9#include <errno.h>
10#include <fdtdec.h>
11#include <malloc.h>
12#include <spi.h>
13#include <dm/device-internal.h>
14#include <dm/uclass-internal.h>
Simon Glassd7af6a42014-10-13 23:41:52 -060015#include <dm/lists.h>
16#include <dm/util.h>
17
18DECLARE_GLOBAL_DATA_PTR;
19
20static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
21{
22 struct dm_spi_ops *ops;
23 int ret;
24
25 ops = spi_get_ops(bus);
26 if (ops->set_speed)
27 ret = ops->set_speed(bus, speed);
28 else
29 ret = -EINVAL;
30 if (ret) {
31 printf("Cannot set speed (err=%d)\n", ret);
32 return ret;
33 }
34
35 if (ops->set_mode)
36 ret = ops->set_mode(bus, mode);
37 else
38 ret = -EINVAL;
39 if (ret) {
40 printf("Cannot set mode (err=%d)\n", ret);
41 return ret;
42 }
43
44 return 0;
45}
46
Peng Fan7a3eff42016-05-03 10:02:22 +080047int dm_spi_claim_bus(struct udevice *dev)
Simon Glassd7af6a42014-10-13 23:41:52 -060048{
Simon Glassd7af6a42014-10-13 23:41:52 -060049 struct udevice *bus = dev->parent;
50 struct dm_spi_ops *ops = spi_get_ops(bus);
Simon Glasse564f052015-03-05 12:25:20 -070051 struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
Peng Fan7a3eff42016-05-03 10:02:22 +080052 struct spi_slave *slave = dev_get_parent_priv(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -060053 int speed;
54 int ret;
55
56 speed = slave->max_hz;
57 if (spi->max_hz) {
58 if (speed)
Masahiro Yamadab4141192014-11-07 03:03:31 +090059 speed = min(speed, (int)spi->max_hz);
Simon Glassd7af6a42014-10-13 23:41:52 -060060 else
61 speed = spi->max_hz;
62 }
63 if (!speed)
64 speed = 100000;
Simon Glass60e28092015-02-17 15:29:35 -070065 if (speed != slave->speed) {
66 ret = spi_set_speed_mode(bus, speed, slave->mode);
67 if (ret)
68 return ret;
69 slave->speed = speed;
70 }
Simon Glassd7af6a42014-10-13 23:41:52 -060071
Simon Glass9694b722015-04-19 09:05:40 -060072 return ops->claim_bus ? ops->claim_bus(dev) : 0;
Simon Glassd7af6a42014-10-13 23:41:52 -060073}
74
Peng Fan7a3eff42016-05-03 10:02:22 +080075void dm_spi_release_bus(struct udevice *dev)
Simon Glassd7af6a42014-10-13 23:41:52 -060076{
Simon Glassd7af6a42014-10-13 23:41:52 -060077 struct udevice *bus = dev->parent;
78 struct dm_spi_ops *ops = spi_get_ops(bus);
79
80 if (ops->release_bus)
Simon Glass9694b722015-04-19 09:05:40 -060081 ops->release_bus(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -060082}
83
Peng Fan7a3eff42016-05-03 10:02:22 +080084int dm_spi_xfer(struct udevice *dev, unsigned int bitlen,
85 const void *dout, void *din, unsigned long flags)
Simon Glassd7af6a42014-10-13 23:41:52 -060086{
Simon Glassd7af6a42014-10-13 23:41:52 -060087 struct udevice *bus = dev->parent;
88
89 if (bus->uclass->uc_drv->id != UCLASS_SPI)
90 return -EOPNOTSUPP;
91
92 return spi_get_ops(bus)->xfer(dev, bitlen, dout, din, flags);
93}
94
Peng Fan7a3eff42016-05-03 10:02:22 +080095int spi_claim_bus(struct spi_slave *slave)
96{
97 return dm_spi_claim_bus(slave->dev);
98}
99
100void spi_release_bus(struct spi_slave *slave)
101{
102 dm_spi_release_bus(slave->dev);
103}
104
105int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
106 const void *dout, void *din, unsigned long flags)
107{
108 return dm_spi_xfer(slave->dev, bitlen, dout, din, flags);
109}
110
Simon Glass6f849c32015-06-23 15:39:05 -0600111static int spi_child_post_bind(struct udevice *dev)
Simon Glassd7af6a42014-10-13 23:41:52 -0600112{
Simon Glassd0cff032015-01-25 08:27:12 -0700113 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600114
Simon Glassd0cff032015-01-25 08:27:12 -0700115 if (dev->of_offset == -1)
116 return 0;
117
118 return spi_slave_ofdata_to_platdata(gd->fdt_blob, dev->of_offset, plat);
119}
120
Simon Glass6f849c32015-06-23 15:39:05 -0600121static int spi_post_probe(struct udevice *bus)
Simon Glassd0cff032015-01-25 08:27:12 -0700122{
Simon Glasse564f052015-03-05 12:25:20 -0700123 struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
Simon Glassd0cff032015-01-25 08:27:12 -0700124
125 spi->max_hz = fdtdec_get_int(gd->fdt_blob, bus->of_offset,
Simon Glassd7af6a42014-10-13 23:41:52 -0600126 "spi-max-frequency", 0);
127
Michal Simek281f1562015-10-27 13:36:42 +0100128#if defined(CONFIG_NEEDS_MANUAL_RELOC)
129 struct dm_spi_ops *ops = spi_get_ops(bus);
130
131
132 if (ops->claim_bus)
133 ops->claim_bus += gd->reloc_off;
134 if (ops->release_bus)
135 ops->release_bus += gd->reloc_off;
136 if (ops->set_wordlen)
137 ops->set_wordlen += gd->reloc_off;
138 if (ops->xfer)
139 ops->xfer += gd->reloc_off;
140 if (ops->set_speed)
141 ops->set_speed += gd->reloc_off;
142 if (ops->set_mode)
143 ops->set_mode += gd->reloc_off;
144 if (ops->cs_info)
145 ops->cs_info += gd->reloc_off;
146#endif
147
Simon Glassd7af6a42014-10-13 23:41:52 -0600148 return 0;
149}
150
Simon Glass6f849c32015-06-23 15:39:05 -0600151static int spi_child_pre_probe(struct udevice *dev)
Simon Glass440714e2015-01-25 08:27:11 -0700152{
Simon Glassd0cff032015-01-25 08:27:12 -0700153 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
Simon Glassbcbe3d12015-09-28 23:32:01 -0600154 struct spi_slave *slave = dev_get_parent_priv(dev);
Simon Glass440714e2015-01-25 08:27:11 -0700155
Simon Glassd0cff032015-01-25 08:27:12 -0700156 /*
157 * This is needed because we pass struct spi_slave around the place
158 * instead slave->dev (a struct udevice). So we have to have some
159 * way to access the slave udevice given struct spi_slave. Once we
160 * change the SPI API to use udevice instead of spi_slave, we can
161 * drop this.
162 */
Simon Glass440714e2015-01-25 08:27:11 -0700163 slave->dev = dev;
164
Simon Glassd0cff032015-01-25 08:27:12 -0700165 slave->max_hz = plat->max_hz;
166 slave->mode = plat->mode;
Mugunthan V Nf8e2f922015-12-23 20:39:37 +0530167 slave->mode_rx = plat->mode_rx;
Christophe Ricard674f3602016-01-17 11:56:48 +0100168 slave->wordlen = SPI_DEFAULT_WORDLEN;
Simon Glassd0cff032015-01-25 08:27:12 -0700169
Simon Glass440714e2015-01-25 08:27:11 -0700170 return 0;
171}
172
Simon Glassd7af6a42014-10-13 23:41:52 -0600173int spi_chip_select(struct udevice *dev)
174{
Simon Glassd0cff032015-01-25 08:27:12 -0700175 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600176
Simon Glassd0cff032015-01-25 08:27:12 -0700177 return plat ? plat->cs : -ENOENT;
Simon Glassd7af6a42014-10-13 23:41:52 -0600178}
179
Simon Glassff56bba2014-11-11 10:46:22 -0700180int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
Simon Glassd7af6a42014-10-13 23:41:52 -0600181{
182 struct udevice *dev;
183
184 for (device_find_first_child(bus, &dev); dev;
185 device_find_next_child(&dev)) {
Simon Glassd0cff032015-01-25 08:27:12 -0700186 struct dm_spi_slave_platdata *plat;
Simon Glassd7af6a42014-10-13 23:41:52 -0600187
Simon Glassd0cff032015-01-25 08:27:12 -0700188 plat = dev_get_parent_platdata(dev);
189 debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
190 if (plat->cs == cs) {
Simon Glassd7af6a42014-10-13 23:41:52 -0600191 *devp = dev;
192 return 0;
193 }
194 }
195
196 return -ENODEV;
197}
198
199int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
200{
201 struct spi_cs_info info;
202 struct udevice *bus;
203 int ret;
204
205 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
206 if (ret) {
207 debug("%s: No bus %d\n", __func__, busnum);
208 return ret;
209 }
210
211 return spi_cs_info(bus, cs, &info);
212}
213
214int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
215{
216 struct spi_cs_info local_info;
217 struct dm_spi_ops *ops;
218 int ret;
219
220 if (!info)
221 info = &local_info;
222
223 /* If there is a device attached, return it */
224 info->dev = NULL;
225 ret = spi_find_chip_select(bus, cs, &info->dev);
226 if (!ret)
227 return 0;
228
229 /*
230 * Otherwise ask the driver. For the moment we don't have CS info.
231 * When we do we could provide the driver with a helper function
232 * to figure out what chip selects are valid, or just handle the
233 * request.
234 */
235 ops = spi_get_ops(bus);
236 if (ops->cs_info)
237 return ops->cs_info(bus, cs, info);
238
239 /*
240 * We could assume there is at least one valid chip select, but best
241 * to be sure and return an error in this case. The driver didn't
242 * care enough to tell us.
243 */
244 return -ENODEV;
245}
246
Simon Glassd7af6a42014-10-13 23:41:52 -0600247int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
248 struct udevice **devp)
249{
250 struct udevice *bus, *dev;
251 int ret;
252
253 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
254 if (ret) {
255 debug("%s: No bus %d\n", __func__, busnum);
256 return ret;
257 }
258 ret = spi_find_chip_select(bus, cs, &dev);
259 if (ret) {
260 debug("%s: No cs %d\n", __func__, cs);
261 return ret;
262 }
263 *busp = bus;
264 *devp = dev;
265
266 return ret;
267}
268
269int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
270 const char *drv_name, const char *dev_name,
271 struct udevice **busp, struct spi_slave **devp)
272{
273 struct udevice *bus, *dev;
Vignesh R96907c02016-07-06 10:04:28 +0530274 struct dm_spi_slave_platdata *plat;
Simon Glassd7af6a42014-10-13 23:41:52 -0600275 bool created = false;
276 int ret;
277
278 ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
279 if (ret) {
280 printf("Invalid bus %d (err=%d)\n", busnum, ret);
281 return ret;
282 }
283 ret = spi_find_chip_select(bus, cs, &dev);
284
285 /*
286 * If there is no such device, create one automatically. This means
287 * that we don't need a device tree node or platform data for the
288 * SPI flash chip - we will bind to the correct driver.
289 */
290 if (ret == -ENODEV && drv_name) {
291 debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
292 __func__, dev_name, busnum, cs, drv_name);
Simon Glass6b186562014-11-11 10:46:23 -0700293 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600294 if (ret)
295 return ret;
Simon Glassd0cff032015-01-25 08:27:12 -0700296 plat = dev_get_parent_platdata(dev);
297 plat->cs = cs;
298 plat->max_hz = speed;
299 plat->mode = mode;
Simon Glassd7af6a42014-10-13 23:41:52 -0600300 created = true;
301 } else if (ret) {
302 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
303 ret);
304 return ret;
305 }
306
307 if (!device_active(dev)) {
Simon Glassd0cff032015-01-25 08:27:12 -0700308 struct spi_slave *slave;
Simon Glassd7af6a42014-10-13 23:41:52 -0600309
Simon Glassd0cff032015-01-25 08:27:12 -0700310 ret = device_probe(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600311 if (ret)
312 goto err;
Simon Glassbcbe3d12015-09-28 23:32:01 -0600313 slave = dev_get_parent_priv(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600314 slave->dev = dev;
Simon Glassd7af6a42014-10-13 23:41:52 -0600315 }
316
Vignesh R96907c02016-07-06 10:04:28 +0530317 plat = dev_get_parent_platdata(dev);
318 if (!speed) {
319 speed = plat->max_hz;
320 mode = plat->mode;
321 }
Simon Glassd7af6a42014-10-13 23:41:52 -0600322 ret = spi_set_speed_mode(bus, speed, mode);
323 if (ret)
324 goto err;
325
326 *busp = bus;
Simon Glassbcbe3d12015-09-28 23:32:01 -0600327 *devp = dev_get_parent_priv(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600328 debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
329
330 return 0;
331
332err:
Anatolij Gustschinc8864d72016-04-21 09:28:02 +0200333 debug("%s: Error path, created=%d, device '%s'\n", __func__,
Simon Glassd0cff032015-01-25 08:27:12 -0700334 created, dev->name);
Simon Glassd7af6a42014-10-13 23:41:52 -0600335 if (created) {
336 device_remove(dev);
337 device_unbind(dev);
338 }
339
340 return ret;
341}
342
343/* Compatibility function - to be removed */
344struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
345 int bus_node)
346{
347 struct udevice *bus, *dev;
348 int ret;
349
350 ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
351 if (ret)
352 return NULL;
353 ret = device_get_child_by_of_offset(bus, node, &dev);
354 if (ret)
355 return NULL;
Simon Glassbcbe3d12015-09-28 23:32:01 -0600356 return dev_get_parent_priv(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600357}
358
359/* Compatibility function - to be removed */
360struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
361 unsigned int speed, unsigned int mode)
362{
363 struct spi_slave *slave;
364 struct udevice *dev;
365 int ret;
366
367 ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
368 &slave);
369 if (ret)
370 return NULL;
371
372 return slave;
373}
374
375void spi_free_slave(struct spi_slave *slave)
376{
377 device_remove(slave->dev);
378 slave->dev = NULL;
379}
380
Simon Glassd0cff032015-01-25 08:27:12 -0700381int spi_slave_ofdata_to_platdata(const void *blob, int node,
382 struct dm_spi_slave_platdata *plat)
Simon Glassd7af6a42014-10-13 23:41:52 -0600383{
Mugunthan V Nf8e2f922015-12-23 20:39:37 +0530384 int mode = 0, mode_rx = 0;
385 int value;
Simon Glassd7af6a42014-10-13 23:41:52 -0600386
Simon Glassd0cff032015-01-25 08:27:12 -0700387 plat->cs = fdtdec_get_int(blob, node, "reg", -1);
388 plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
Simon Glassd7af6a42014-10-13 23:41:52 -0600389 if (fdtdec_get_bool(blob, node, "spi-cpol"))
390 mode |= SPI_CPOL;
391 if (fdtdec_get_bool(blob, node, "spi-cpha"))
392 mode |= SPI_CPHA;
393 if (fdtdec_get_bool(blob, node, "spi-cs-high"))
394 mode |= SPI_CS_HIGH;
Jagan Teki379b49d2015-12-03 22:19:05 +0530395 if (fdtdec_get_bool(blob, node, "spi-3wire"))
396 mode |= SPI_3WIRE;
Simon Glassd7af6a42014-10-13 23:41:52 -0600397 if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
398 mode |= SPI_PREAMBLE;
Mugunthan V Nf8e2f922015-12-23 20:39:37 +0530399
400 /* Device DUAL/QUAD mode */
401 value = fdtdec_get_uint(blob, node, "spi-tx-bus-width", 1);
402 switch (value) {
403 case 1:
404 break;
405 case 2:
406 mode |= SPI_TX_DUAL;
407 break;
408 case 4:
409 mode |= SPI_TX_QUAD;
410 break;
411 default:
412 error("spi-tx-bus-width %d not supported\n", value);
413 break;
414 }
415
Simon Glassd0cff032015-01-25 08:27:12 -0700416 plat->mode = mode;
Simon Glassd7af6a42014-10-13 23:41:52 -0600417
Mugunthan V Nf8e2f922015-12-23 20:39:37 +0530418 value = fdtdec_get_uint(blob, node, "spi-rx-bus-width", 1);
419 switch (value) {
420 case 1:
421 break;
422 case 2:
423 mode_rx |= SPI_RX_DUAL;
424 break;
425 case 4:
426 mode_rx |= SPI_RX_QUAD;
427 break;
428 default:
429 error("spi-rx-bus-width %d not supported\n", value);
430 break;
431 }
432
433 plat->mode_rx = mode_rx;
434
Simon Glassd7af6a42014-10-13 23:41:52 -0600435 return 0;
436}
437
438UCLASS_DRIVER(spi) = {
439 .id = UCLASS_SPI,
440 .name = "spi",
Simon Glass9cc36a22015-01-25 08:27:05 -0700441 .flags = DM_UC_FLAG_SEQ_ALIAS,
Simon Glass91195482016-07-05 17:10:10 -0600442 .post_bind = dm_scan_fdt_dev,
Simon Glassd7af6a42014-10-13 23:41:52 -0600443 .post_probe = spi_post_probe,
Simon Glass440714e2015-01-25 08:27:11 -0700444 .child_pre_probe = spi_child_pre_probe,
Simon Glassd7af6a42014-10-13 23:41:52 -0600445 .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
Simon Glass19a25f62015-01-25 08:27:07 -0700446 .per_child_auto_alloc_size = sizeof(struct spi_slave),
Simon Glassd0cff032015-01-25 08:27:12 -0700447 .per_child_platdata_auto_alloc_size =
448 sizeof(struct dm_spi_slave_platdata),
449 .child_post_bind = spi_child_post_bind,
Simon Glassd7af6a42014-10-13 23:41:52 -0600450};
451
452UCLASS_DRIVER(spi_generic) = {
453 .id = UCLASS_SPI_GENERIC,
454 .name = "spi_generic",
455};
456
457U_BOOT_DRIVER(spi_generic_drv) = {
458 .name = "spi_generic_drv",
459 .id = UCLASS_SPI_GENERIC,
460};