blob: 737ae64052acace832e332ba16ea69e3ddc8adc6 [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>
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 Glasse564f052015-03-05 12:25:20 -070053 struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
Simon Glassd7af6a42014-10-13 23:41:52 -060054 int speed;
55 int ret;
56
57 speed = slave->max_hz;
58 if (spi->max_hz) {
59 if (speed)
Masahiro Yamadab4141192014-11-07 03:03:31 +090060 speed = min(speed, (int)spi->max_hz);
Simon Glassd7af6a42014-10-13 23:41:52 -060061 else
62 speed = spi->max_hz;
63 }
64 if (!speed)
65 speed = 100000;
Simon Glass60e28092015-02-17 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 Glassd7af6a42014-10-13 23:41:52 -060072
Simon Glass9694b722015-04-19 09:05:40 -060073 return ops->claim_bus ? ops->claim_bus(dev) : 0;
Simon Glassd7af6a42014-10-13 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 Glass9694b722015-04-19 09:05:40 -060083 ops->release_bus(dev);
Simon Glassd7af6a42014-10-13 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
98int spi_post_bind(struct udevice *dev)
99{
100 /* Scan the bus for devices */
101 return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
102}
103
Simon Glassd0cff032015-01-25 08:27:12 -0700104int spi_child_post_bind(struct udevice *dev)
Simon Glassd7af6a42014-10-13 23:41:52 -0600105{
Simon Glassd0cff032015-01-25 08:27:12 -0700106 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600107
Simon Glassd0cff032015-01-25 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
114int spi_post_probe(struct udevice *bus)
115{
Simon Glasse564f052015-03-05 12:25:20 -0700116 struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
Simon Glassd0cff032015-01-25 08:27:12 -0700117
118 spi->max_hz = fdtdec_get_int(gd->fdt_blob, bus->of_offset,
Simon Glassd7af6a42014-10-13 23:41:52 -0600119 "spi-max-frequency", 0);
120
121 return 0;
122}
123
Simon Glass440714e2015-01-25 08:27:11 -0700124int spi_child_pre_probe(struct udevice *dev)
125{
Simon Glassd0cff032015-01-25 08:27:12 -0700126 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
Simon Glass440714e2015-01-25 08:27:11 -0700127 struct spi_slave *slave = dev_get_parentdata(dev);
128
Simon Glassd0cff032015-01-25 08:27:12 -0700129 /*
130 * This is needed because we pass struct spi_slave around the place
131 * instead slave->dev (a struct udevice). So we have to have some
132 * way to access the slave udevice given struct spi_slave. Once we
133 * change the SPI API to use udevice instead of spi_slave, we can
134 * drop this.
135 */
Simon Glass440714e2015-01-25 08:27:11 -0700136 slave->dev = dev;
137
Simon Glassd0cff032015-01-25 08:27:12 -0700138 slave->max_hz = plat->max_hz;
139 slave->mode = plat->mode;
140
Simon Glass440714e2015-01-25 08:27:11 -0700141 return 0;
142}
143
Simon Glassd7af6a42014-10-13 23:41:52 -0600144int spi_chip_select(struct udevice *dev)
145{
Simon Glassd0cff032015-01-25 08:27:12 -0700146 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600147
Simon Glassd0cff032015-01-25 08:27:12 -0700148 return plat ? plat->cs : -ENOENT;
Simon Glassd7af6a42014-10-13 23:41:52 -0600149}
150
Simon Glassff56bba2014-11-11 10:46:22 -0700151int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
Simon Glassd7af6a42014-10-13 23:41:52 -0600152{
153 struct udevice *dev;
154
155 for (device_find_first_child(bus, &dev); dev;
156 device_find_next_child(&dev)) {
Simon Glassd0cff032015-01-25 08:27:12 -0700157 struct dm_spi_slave_platdata *plat;
Simon Glassd7af6a42014-10-13 23:41:52 -0600158
Simon Glassd0cff032015-01-25 08:27:12 -0700159 plat = dev_get_parent_platdata(dev);
160 debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
161 if (plat->cs == cs) {
Simon Glassd7af6a42014-10-13 23:41:52 -0600162 *devp = dev;
163 return 0;
164 }
165 }
166
167 return -ENODEV;
168}
169
170int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
171{
172 struct spi_cs_info info;
173 struct udevice *bus;
174 int ret;
175
176 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
177 if (ret) {
178 debug("%s: No bus %d\n", __func__, busnum);
179 return ret;
180 }
181
182 return spi_cs_info(bus, cs, &info);
183}
184
185int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
186{
187 struct spi_cs_info local_info;
188 struct dm_spi_ops *ops;
189 int ret;
190
191 if (!info)
192 info = &local_info;
193
194 /* If there is a device attached, return it */
195 info->dev = NULL;
196 ret = spi_find_chip_select(bus, cs, &info->dev);
197 if (!ret)
198 return 0;
199
200 /*
201 * Otherwise ask the driver. For the moment we don't have CS info.
202 * When we do we could provide the driver with a helper function
203 * to figure out what chip selects are valid, or just handle the
204 * request.
205 */
206 ops = spi_get_ops(bus);
207 if (ops->cs_info)
208 return ops->cs_info(bus, cs, info);
209
210 /*
211 * We could assume there is at least one valid chip select, but best
212 * to be sure and return an error in this case. The driver didn't
213 * care enough to tell us.
214 */
215 return -ENODEV;
216}
217
Simon Glassd7af6a42014-10-13 23:41:52 -0600218int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
219 struct udevice **devp)
220{
221 struct udevice *bus, *dev;
222 int ret;
223
224 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
225 if (ret) {
226 debug("%s: No bus %d\n", __func__, busnum);
227 return ret;
228 }
229 ret = spi_find_chip_select(bus, cs, &dev);
230 if (ret) {
231 debug("%s: No cs %d\n", __func__, cs);
232 return ret;
233 }
234 *busp = bus;
235 *devp = dev;
236
237 return ret;
238}
239
240int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
241 const char *drv_name, const char *dev_name,
242 struct udevice **busp, struct spi_slave **devp)
243{
244 struct udevice *bus, *dev;
Simon Glassd7af6a42014-10-13 23:41:52 -0600245 bool created = false;
246 int ret;
247
248 ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
249 if (ret) {
250 printf("Invalid bus %d (err=%d)\n", busnum, ret);
251 return ret;
252 }
253 ret = spi_find_chip_select(bus, cs, &dev);
254
255 /*
256 * If there is no such device, create one automatically. This means
257 * that we don't need a device tree node or platform data for the
258 * SPI flash chip - we will bind to the correct driver.
259 */
260 if (ret == -ENODEV && drv_name) {
Simon Glassd0cff032015-01-25 08:27:12 -0700261 struct dm_spi_slave_platdata *plat;
262
Simon Glassd7af6a42014-10-13 23:41:52 -0600263 debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
264 __func__, dev_name, busnum, cs, drv_name);
Simon Glass6b186562014-11-11 10:46:23 -0700265 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600266 if (ret)
267 return ret;
Simon Glassd0cff032015-01-25 08:27:12 -0700268 plat = dev_get_parent_platdata(dev);
269 plat->cs = cs;
270 plat->max_hz = speed;
271 plat->mode = mode;
Simon Glassd7af6a42014-10-13 23:41:52 -0600272 created = true;
273 } else if (ret) {
274 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
275 ret);
276 return ret;
277 }
278
279 if (!device_active(dev)) {
Simon Glassd0cff032015-01-25 08:27:12 -0700280 struct spi_slave *slave;
Simon Glassd7af6a42014-10-13 23:41:52 -0600281
Simon Glassd0cff032015-01-25 08:27:12 -0700282 ret = device_probe(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600283 if (ret)
284 goto err;
Simon Glassd0cff032015-01-25 08:27:12 -0700285 slave = dev_get_parentdata(dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600286 slave->dev = dev;
Simon Glassd7af6a42014-10-13 23:41:52 -0600287 }
288
289 ret = spi_set_speed_mode(bus, speed, mode);
290 if (ret)
291 goto err;
292
293 *busp = bus;
294 *devp = dev_get_parentdata(dev);
295 debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
296
297 return 0;
298
299err:
Simon Glassd0cff032015-01-25 08:27:12 -0700300 debug("%s: Error path, credted=%d, device '%s'\n", __func__,
301 created, dev->name);
Simon Glassd7af6a42014-10-13 23:41:52 -0600302 if (created) {
303 device_remove(dev);
304 device_unbind(dev);
305 }
306
307 return ret;
308}
309
310/* Compatibility function - to be removed */
311struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
312 int bus_node)
313{
314 struct udevice *bus, *dev;
315 int ret;
316
317 ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
318 if (ret)
319 return NULL;
320 ret = device_get_child_by_of_offset(bus, node, &dev);
321 if (ret)
322 return NULL;
323 return dev_get_parentdata(dev);
324}
325
326/* Compatibility function - to be removed */
327struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
328 unsigned int speed, unsigned int mode)
329{
330 struct spi_slave *slave;
331 struct udevice *dev;
332 int ret;
333
334 ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
335 &slave);
336 if (ret)
337 return NULL;
338
339 return slave;
340}
341
342void spi_free_slave(struct spi_slave *slave)
343{
344 device_remove(slave->dev);
345 slave->dev = NULL;
346}
347
Simon Glassd0cff032015-01-25 08:27:12 -0700348int spi_slave_ofdata_to_platdata(const void *blob, int node,
349 struct dm_spi_slave_platdata *plat)
Simon Glassd7af6a42014-10-13 23:41:52 -0600350{
351 int mode = 0;
352
Simon Glassd0cff032015-01-25 08:27:12 -0700353 plat->cs = fdtdec_get_int(blob, node, "reg", -1);
354 plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
Simon Glassd7af6a42014-10-13 23:41:52 -0600355 if (fdtdec_get_bool(blob, node, "spi-cpol"))
356 mode |= SPI_CPOL;
357 if (fdtdec_get_bool(blob, node, "spi-cpha"))
358 mode |= SPI_CPHA;
359 if (fdtdec_get_bool(blob, node, "spi-cs-high"))
360 mode |= SPI_CS_HIGH;
361 if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
362 mode |= SPI_PREAMBLE;
Simon Glassd0cff032015-01-25 08:27:12 -0700363 plat->mode = mode;
Simon Glassd7af6a42014-10-13 23:41:52 -0600364
365 return 0;
366}
367
368UCLASS_DRIVER(spi) = {
369 .id = UCLASS_SPI,
370 .name = "spi",
Simon Glass9cc36a22015-01-25 08:27:05 -0700371 .flags = DM_UC_FLAG_SEQ_ALIAS,
Simon Glassd7af6a42014-10-13 23:41:52 -0600372 .post_bind = spi_post_bind,
373 .post_probe = spi_post_probe,
Simon Glass440714e2015-01-25 08:27:11 -0700374 .child_pre_probe = spi_child_pre_probe,
Simon Glassd7af6a42014-10-13 23:41:52 -0600375 .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
Simon Glass19a25f62015-01-25 08:27:07 -0700376 .per_child_auto_alloc_size = sizeof(struct spi_slave),
Simon Glassd0cff032015-01-25 08:27:12 -0700377 .per_child_platdata_auto_alloc_size =
378 sizeof(struct dm_spi_slave_platdata),
379 .child_post_bind = spi_child_post_bind,
Simon Glassd7af6a42014-10-13 23:41:52 -0600380};
381
382UCLASS_DRIVER(spi_generic) = {
383 .id = UCLASS_SPI_GENERIC,
384 .name = "spi_generic",
385};
386
387U_BOOT_DRIVER(spi_generic_drv) = {
388 .name = "spi_generic_drv",
389 .id = UCLASS_SPI_GENERIC,
390};