blob: e0f6b25f30a6b6b6f814415faabc7968a12a00cb [file] [log] [blame]
Simon Glassdd82d442014-10-13 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>
15#include <dm/root.h>
16#include <dm/lists.h>
17#include <dm/util.h>
18
19DECLARE_GLOBAL_DATA_PTR;
20
21static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
22{
23 struct dm_spi_ops *ops;
24 int ret;
25
26 ops = spi_get_ops(bus);
27 if (ops->set_speed)
28 ret = ops->set_speed(bus, speed);
29 else
30 ret = -EINVAL;
31 if (ret) {
32 printf("Cannot set speed (err=%d)\n", ret);
33 return ret;
34 }
35
36 if (ops->set_mode)
37 ret = ops->set_mode(bus, mode);
38 else
39 ret = -EINVAL;
40 if (ret) {
41 printf("Cannot set mode (err=%d)\n", ret);
42 return ret;
43 }
44
45 return 0;
46}
47
48int spi_claim_bus(struct spi_slave *slave)
49{
50 struct udevice *dev = slave->dev;
51 struct udevice *bus = dev->parent;
52 struct dm_spi_ops *ops = spi_get_ops(bus);
Simon Glassde0977b2015-03-05 12:25:20 -070053 struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
Simon Glassdd82d442014-10-13 23:41:52 -060054 int speed;
55 int ret;
56
57 speed = slave->max_hz;
58 if (spi->max_hz) {
59 if (speed)
Masahiro Yamadadb204642014-11-07 03:03:31 +090060 speed = min(speed, (int)spi->max_hz);
Simon Glassdd82d442014-10-13 23:41:52 -060061 else
62 speed = spi->max_hz;
63 }
64 if (!speed)
65 speed = 100000;
Simon Glassb46cb632015-02-17 15:29:35 -070066 if (speed != slave->speed) {
67 ret = spi_set_speed_mode(bus, speed, slave->mode);
68 if (ret)
69 return ret;
70 slave->speed = speed;
71 }
Simon Glassdd82d442014-10-13 23:41:52 -060072
Simon Glass5c74fba2015-04-19 09:05:40 -060073 return ops->claim_bus ? ops->claim_bus(dev) : 0;
Simon Glassdd82d442014-10-13 23:41:52 -060074}
75
76void spi_release_bus(struct spi_slave *slave)
77{
78 struct udevice *dev = slave->dev;
79 struct udevice *bus = dev->parent;
80 struct dm_spi_ops *ops = spi_get_ops(bus);
81
82 if (ops->release_bus)
Simon Glass5c74fba2015-04-19 09:05:40 -060083 ops->release_bus(dev);
Simon Glassdd82d442014-10-13 23:41:52 -060084}
85
86int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
87 const void *dout, void *din, unsigned long flags)
88{
89 struct udevice *dev = slave->dev;
90 struct udevice *bus = dev->parent;
91
92 if (bus->uclass->uc_drv->id != UCLASS_SPI)
93 return -EOPNOTSUPP;
94
95 return spi_get_ops(bus)->xfer(dev, bitlen, dout, din, flags);
96}
97
Simon Glassd941aaf2015-06-23 15:39:05 -060098static int spi_post_bind(struct udevice *dev)
Simon Glassdd82d442014-10-13 23:41:52 -060099{
100 /* Scan the bus for devices */
101 return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
102}
103
Simon Glassd941aaf2015-06-23 15:39:05 -0600104static int spi_child_post_bind(struct udevice *dev)
Simon Glassdd82d442014-10-13 23:41:52 -0600105{
Simon Glass5d2ee052015-01-25 08:27:12 -0700106 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
Simon Glassdd82d442014-10-13 23:41:52 -0600107
Simon Glass5d2ee052015-01-25 08:27:12 -0700108 if (dev->of_offset == -1)
109 return 0;
110
111 return spi_slave_ofdata_to_platdata(gd->fdt_blob, dev->of_offset, plat);
112}
113
Simon Glassd941aaf2015-06-23 15:39:05 -0600114static int spi_post_probe(struct udevice *bus)
Simon Glass5d2ee052015-01-25 08:27:12 -0700115{
Simon Glassde0977b2015-03-05 12:25:20 -0700116 struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
Simon Glass5d2ee052015-01-25 08:27:12 -0700117
118 spi->max_hz = fdtdec_get_int(gd->fdt_blob, bus->of_offset,
Simon Glassdd82d442014-10-13 23:41:52 -0600119 "spi-max-frequency", 0);
120
Michal Simek28d7e4e2015-10-27 13:36:42 +0100121#if defined(CONFIG_NEEDS_MANUAL_RELOC)
122 struct dm_spi_ops *ops = spi_get_ops(bus);
123
124
125 if (ops->claim_bus)
126 ops->claim_bus += gd->reloc_off;
127 if (ops->release_bus)
128 ops->release_bus += gd->reloc_off;
129 if (ops->set_wordlen)
130 ops->set_wordlen += gd->reloc_off;
131 if (ops->xfer)
132 ops->xfer += gd->reloc_off;
133 if (ops->set_speed)
134 ops->set_speed += gd->reloc_off;
135 if (ops->set_mode)
136 ops->set_mode += gd->reloc_off;
137 if (ops->cs_info)
138 ops->cs_info += gd->reloc_off;
139#endif
140
Simon Glassdd82d442014-10-13 23:41:52 -0600141 return 0;
142}
143
Simon Glassd941aaf2015-06-23 15:39:05 -0600144static int spi_child_pre_probe(struct udevice *dev)
Simon Glass82c2f502015-01-25 08:27:11 -0700145{
Simon Glass5d2ee052015-01-25 08:27:12 -0700146 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
Simon Glassde44acf2015-09-28 23:32:01 -0600147 struct spi_slave *slave = dev_get_parent_priv(dev);
Simon Glass82c2f502015-01-25 08:27:11 -0700148
Simon Glass5d2ee052015-01-25 08:27:12 -0700149 /*
150 * This is needed because we pass struct spi_slave around the place
151 * instead slave->dev (a struct udevice). So we have to have some
152 * way to access the slave udevice given struct spi_slave. Once we
153 * change the SPI API to use udevice instead of spi_slave, we can
154 * drop this.
155 */
Simon Glass82c2f502015-01-25 08:27:11 -0700156 slave->dev = dev;
157
Simon Glass5d2ee052015-01-25 08:27:12 -0700158 slave->max_hz = plat->max_hz;
159 slave->mode = plat->mode;
160
Simon Glass82c2f502015-01-25 08:27:11 -0700161 return 0;
162}
163
Simon Glassdd82d442014-10-13 23:41:52 -0600164int spi_chip_select(struct udevice *dev)
165{
Simon Glass5d2ee052015-01-25 08:27:12 -0700166 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
Simon Glassdd82d442014-10-13 23:41:52 -0600167
Simon Glass5d2ee052015-01-25 08:27:12 -0700168 return plat ? plat->cs : -ENOENT;
Simon Glassdd82d442014-10-13 23:41:52 -0600169}
170
Simon Glass5ef36f22014-11-11 10:46:22 -0700171int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
Simon Glassdd82d442014-10-13 23:41:52 -0600172{
173 struct udevice *dev;
174
175 for (device_find_first_child(bus, &dev); dev;
176 device_find_next_child(&dev)) {
Simon Glass5d2ee052015-01-25 08:27:12 -0700177 struct dm_spi_slave_platdata *plat;
Simon Glassdd82d442014-10-13 23:41:52 -0600178
Simon Glass5d2ee052015-01-25 08:27:12 -0700179 plat = dev_get_parent_platdata(dev);
180 debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
181 if (plat->cs == cs) {
Simon Glassdd82d442014-10-13 23:41:52 -0600182 *devp = dev;
183 return 0;
184 }
185 }
186
187 return -ENODEV;
188}
189
190int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
191{
192 struct spi_cs_info info;
193 struct udevice *bus;
194 int ret;
195
196 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
197 if (ret) {
198 debug("%s: No bus %d\n", __func__, busnum);
199 return ret;
200 }
201
202 return spi_cs_info(bus, cs, &info);
203}
204
205int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
206{
207 struct spi_cs_info local_info;
208 struct dm_spi_ops *ops;
209 int ret;
210
211 if (!info)
212 info = &local_info;
213
214 /* If there is a device attached, return it */
215 info->dev = NULL;
216 ret = spi_find_chip_select(bus, cs, &info->dev);
217 if (!ret)
218 return 0;
219
220 /*
221 * Otherwise ask the driver. For the moment we don't have CS info.
222 * When we do we could provide the driver with a helper function
223 * to figure out what chip selects are valid, or just handle the
224 * request.
225 */
226 ops = spi_get_ops(bus);
227 if (ops->cs_info)
228 return ops->cs_info(bus, cs, info);
229
230 /*
231 * We could assume there is at least one valid chip select, but best
232 * to be sure and return an error in this case. The driver didn't
233 * care enough to tell us.
234 */
235 return -ENODEV;
236}
237
Simon Glassdd82d442014-10-13 23:41:52 -0600238int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
239 struct udevice **devp)
240{
241 struct udevice *bus, *dev;
242 int ret;
243
244 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
245 if (ret) {
246 debug("%s: No bus %d\n", __func__, busnum);
247 return ret;
248 }
249 ret = spi_find_chip_select(bus, cs, &dev);
250 if (ret) {
251 debug("%s: No cs %d\n", __func__, cs);
252 return ret;
253 }
254 *busp = bus;
255 *devp = dev;
256
257 return ret;
258}
259
260int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
261 const char *drv_name, const char *dev_name,
262 struct udevice **busp, struct spi_slave **devp)
263{
264 struct udevice *bus, *dev;
Simon Glassdd82d442014-10-13 23:41:52 -0600265 bool created = false;
266 int ret;
267
268 ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
269 if (ret) {
270 printf("Invalid bus %d (err=%d)\n", busnum, ret);
271 return ret;
272 }
273 ret = spi_find_chip_select(bus, cs, &dev);
274
275 /*
276 * If there is no such device, create one automatically. This means
277 * that we don't need a device tree node or platform data for the
278 * SPI flash chip - we will bind to the correct driver.
279 */
280 if (ret == -ENODEV && drv_name) {
Simon Glass5d2ee052015-01-25 08:27:12 -0700281 struct dm_spi_slave_platdata *plat;
282
Simon Glassdd82d442014-10-13 23:41:52 -0600283 debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
284 __func__, dev_name, busnum, cs, drv_name);
Simon Glassd8a21f62014-11-11 10:46:23 -0700285 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
Simon Glassdd82d442014-10-13 23:41:52 -0600286 if (ret)
287 return ret;
Simon Glass5d2ee052015-01-25 08:27:12 -0700288 plat = dev_get_parent_platdata(dev);
289 plat->cs = cs;
290 plat->max_hz = speed;
291 plat->mode = mode;
Simon Glassdd82d442014-10-13 23:41:52 -0600292 created = true;
293 } else if (ret) {
294 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
295 ret);
296 return ret;
297 }
298
299 if (!device_active(dev)) {
Simon Glass5d2ee052015-01-25 08:27:12 -0700300 struct spi_slave *slave;
Simon Glassdd82d442014-10-13 23:41:52 -0600301
Simon Glass5d2ee052015-01-25 08:27:12 -0700302 ret = device_probe(dev);
Simon Glassdd82d442014-10-13 23:41:52 -0600303 if (ret)
304 goto err;
Simon Glassde44acf2015-09-28 23:32:01 -0600305 slave = dev_get_parent_priv(dev);
Simon Glassdd82d442014-10-13 23:41:52 -0600306 slave->dev = dev;
Simon Glassdd82d442014-10-13 23:41:52 -0600307 }
308
309 ret = spi_set_speed_mode(bus, speed, mode);
310 if (ret)
311 goto err;
312
313 *busp = bus;
Simon Glassde44acf2015-09-28 23:32:01 -0600314 *devp = dev_get_parent_priv(dev);
Simon Glassdd82d442014-10-13 23:41:52 -0600315 debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
316
317 return 0;
318
319err:
Simon Glass5d2ee052015-01-25 08:27:12 -0700320 debug("%s: Error path, credted=%d, device '%s'\n", __func__,
321 created, dev->name);
Simon Glassdd82d442014-10-13 23:41:52 -0600322 if (created) {
323 device_remove(dev);
324 device_unbind(dev);
325 }
326
327 return ret;
328}
329
330/* Compatibility function - to be removed */
331struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
332 int bus_node)
333{
334 struct udevice *bus, *dev;
335 int ret;
336
337 ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
338 if (ret)
339 return NULL;
340 ret = device_get_child_by_of_offset(bus, node, &dev);
341 if (ret)
342 return NULL;
Simon Glassde44acf2015-09-28 23:32:01 -0600343 return dev_get_parent_priv(dev);
Simon Glassdd82d442014-10-13 23:41:52 -0600344}
345
346/* Compatibility function - to be removed */
347struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
348 unsigned int speed, unsigned int mode)
349{
350 struct spi_slave *slave;
351 struct udevice *dev;
352 int ret;
353
354 ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
355 &slave);
356 if (ret)
357 return NULL;
358
359 return slave;
360}
361
362void spi_free_slave(struct spi_slave *slave)
363{
364 device_remove(slave->dev);
365 slave->dev = NULL;
366}
367
Simon Glass5d2ee052015-01-25 08:27:12 -0700368int spi_slave_ofdata_to_platdata(const void *blob, int node,
369 struct dm_spi_slave_platdata *plat)
Simon Glassdd82d442014-10-13 23:41:52 -0600370{
371 int mode = 0;
372
Simon Glass5d2ee052015-01-25 08:27:12 -0700373 plat->cs = fdtdec_get_int(blob, node, "reg", -1);
374 plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
Simon Glassdd82d442014-10-13 23:41:52 -0600375 if (fdtdec_get_bool(blob, node, "spi-cpol"))
376 mode |= SPI_CPOL;
377 if (fdtdec_get_bool(blob, node, "spi-cpha"))
378 mode |= SPI_CPHA;
379 if (fdtdec_get_bool(blob, node, "spi-cs-high"))
380 mode |= SPI_CS_HIGH;
Jagan Tekid3868fd2015-12-03 22:19:05 +0530381 if (fdtdec_get_bool(blob, node, "spi-3wire"))
382 mode |= SPI_3WIRE;
Simon Glassdd82d442014-10-13 23:41:52 -0600383 if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
384 mode |= SPI_PREAMBLE;
Simon Glass5d2ee052015-01-25 08:27:12 -0700385 plat->mode = mode;
Simon Glassdd82d442014-10-13 23:41:52 -0600386
387 return 0;
388}
389
390UCLASS_DRIVER(spi) = {
391 .id = UCLASS_SPI,
392 .name = "spi",
Simon Glass0ccb0972015-01-25 08:27:05 -0700393 .flags = DM_UC_FLAG_SEQ_ALIAS,
Simon Glassdd82d442014-10-13 23:41:52 -0600394 .post_bind = spi_post_bind,
395 .post_probe = spi_post_probe,
Simon Glass82c2f502015-01-25 08:27:11 -0700396 .child_pre_probe = spi_child_pre_probe,
Simon Glassdd82d442014-10-13 23:41:52 -0600397 .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
Simon Glass31a4d8d2015-01-25 08:27:07 -0700398 .per_child_auto_alloc_size = sizeof(struct spi_slave),
Simon Glass5d2ee052015-01-25 08:27:12 -0700399 .per_child_platdata_auto_alloc_size =
400 sizeof(struct dm_spi_slave_platdata),
401 .child_post_bind = spi_child_post_bind,
Simon Glassdd82d442014-10-13 23:41:52 -0600402};
403
404UCLASS_DRIVER(spi_generic) = {
405 .id = UCLASS_SPI_GENERIC,
406 .name = "spi_generic",
407};
408
409U_BOOT_DRIVER(spi_generic_drv) = {
410 .name = "spi_generic_drv",
411 .id = UCLASS_SPI_GENERIC,
412};