2 * Copyright (c) 2014 Google, Inc
4 * SPDX-License-Identifier: GPL-2.0+
13 #include <dm/device-internal.h>
14 #include <dm/uclass-internal.h>
18 DECLARE_GLOBAL_DATA_PTR;
20 static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
22 struct dm_spi_ops *ops;
25 ops = spi_get_ops(bus);
27 ret = ops->set_speed(bus, speed);
31 printf("Cannot set speed (err=%d)\n", ret);
36 ret = ops->set_mode(bus, mode);
40 printf("Cannot set mode (err=%d)\n", ret);
47 int dm_spi_claim_bus(struct udevice *dev)
49 struct udevice *bus = dev->parent;
50 struct dm_spi_ops *ops = spi_get_ops(bus);
51 struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
52 struct spi_slave *slave = dev_get_parent_priv(dev);
56 speed = slave->max_hz;
59 speed = min(speed, (int)spi->max_hz);
65 if (speed != slave->speed) {
66 ret = spi_set_speed_mode(bus, speed, slave->mode);
72 return ops->claim_bus ? ops->claim_bus(dev) : 0;
75 void dm_spi_release_bus(struct udevice *dev)
77 struct udevice *bus = dev->parent;
78 struct dm_spi_ops *ops = spi_get_ops(bus);
81 ops->release_bus(dev);
84 int dm_spi_xfer(struct udevice *dev, unsigned int bitlen,
85 const void *dout, void *din, unsigned long flags)
87 struct udevice *bus = dev->parent;
89 if (bus->uclass->uc_drv->id != UCLASS_SPI)
92 return spi_get_ops(bus)->xfer(dev, bitlen, dout, din, flags);
95 int spi_claim_bus(struct spi_slave *slave)
97 return dm_spi_claim_bus(slave->dev);
100 void spi_release_bus(struct spi_slave *slave)
102 dm_spi_release_bus(slave->dev);
105 int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
106 const void *dout, void *din, unsigned long flags)
108 return dm_spi_xfer(slave->dev, bitlen, dout, din, flags);
111 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
112 static int spi_child_post_bind(struct udevice *dev)
114 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
116 if (dev_of_offset(dev) == -1)
119 return spi_slave_ofdata_to_platdata(gd->fdt_blob, dev_of_offset(dev),
124 static int spi_post_probe(struct udevice *bus)
126 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
127 struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
129 spi->max_hz = fdtdec_get_int(gd->fdt_blob, dev_of_offset(bus),
130 "spi-max-frequency", 0);
132 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
133 struct dm_spi_ops *ops = spi_get_ops(bus);
137 ops->claim_bus += gd->reloc_off;
138 if (ops->release_bus)
139 ops->release_bus += gd->reloc_off;
140 if (ops->set_wordlen)
141 ops->set_wordlen += gd->reloc_off;
143 ops->xfer += gd->reloc_off;
145 ops->set_speed += gd->reloc_off;
147 ops->set_mode += gd->reloc_off;
149 ops->cs_info += gd->reloc_off;
155 static int spi_child_pre_probe(struct udevice *dev)
157 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
158 struct spi_slave *slave = dev_get_parent_priv(dev);
161 * This is needed because we pass struct spi_slave around the place
162 * instead slave->dev (a struct udevice). So we have to have some
163 * way to access the slave udevice given struct spi_slave. Once we
164 * change the SPI API to use udevice instead of spi_slave, we can
169 slave->max_hz = plat->max_hz;
170 slave->mode = plat->mode;
171 slave->wordlen = SPI_DEFAULT_WORDLEN;
176 int spi_chip_select(struct udevice *dev)
178 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
180 return plat ? plat->cs : -ENOENT;
183 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
187 for (device_find_first_child(bus, &dev); dev;
188 device_find_next_child(&dev)) {
189 struct dm_spi_slave_platdata *plat;
191 plat = dev_get_parent_platdata(dev);
192 debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
193 if (plat->cs == cs) {
202 int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
204 struct spi_cs_info info;
208 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
210 debug("%s: No bus %d\n", __func__, busnum);
214 return spi_cs_info(bus, cs, &info);
217 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
219 struct spi_cs_info local_info;
220 struct dm_spi_ops *ops;
226 /* If there is a device attached, return it */
228 ret = spi_find_chip_select(bus, cs, &info->dev);
233 * Otherwise ask the driver. For the moment we don't have CS info.
234 * When we do we could provide the driver with a helper function
235 * to figure out what chip selects are valid, or just handle the
238 ops = spi_get_ops(bus);
240 return ops->cs_info(bus, cs, info);
243 * We could assume there is at least one valid chip select, but best
244 * to be sure and return an error in this case. The driver didn't
245 * care enough to tell us.
250 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
251 struct udevice **devp)
253 struct udevice *bus, *dev;
256 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
258 debug("%s: No bus %d\n", __func__, busnum);
261 ret = spi_find_chip_select(bus, cs, &dev);
263 debug("%s: No cs %d\n", __func__, cs);
272 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
273 const char *drv_name, const char *dev_name,
274 struct udevice **busp, struct spi_slave **devp)
276 struct udevice *bus, *dev;
277 struct dm_spi_slave_platdata *plat;
278 bool created = false;
281 #if CONFIG_IS_ENABLED(OF_PLATDATA)
282 ret = uclass_first_device_err(UCLASS_SPI, &bus);
284 ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
287 printf("Invalid bus %d (err=%d)\n", busnum, ret);
290 ret = spi_find_chip_select(bus, cs, &dev);
293 * If there is no such device, create one automatically. This means
294 * that we don't need a device tree node or platform data for the
295 * SPI flash chip - we will bind to the correct driver.
297 if (ret == -ENODEV && drv_name) {
298 debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
299 __func__, dev_name, busnum, cs, drv_name);
300 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
302 debug("%s: Unable to bind driver (ret=%d)\n", __func__,
306 plat = dev_get_parent_platdata(dev);
308 plat->max_hz = speed;
312 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
317 if (!device_active(dev)) {
318 struct spi_slave *slave;
320 ret = device_probe(dev);
323 slave = dev_get_parent_priv(dev);
327 plat = dev_get_parent_platdata(dev);
329 speed = plat->max_hz;
332 ret = spi_set_speed_mode(bus, speed, mode);
337 *devp = dev_get_parent_priv(dev);
338 debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
343 debug("%s: Error path, created=%d, device '%s'\n", __func__,
346 device_remove(dev, DM_REMOVE_NORMAL);
353 /* Compatibility function - to be removed */
354 struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
357 struct udevice *bus, *dev;
360 ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
363 ret = device_get_child_by_of_offset(bus, node, &dev);
366 return dev_get_parent_priv(dev);
369 /* Compatibility function - to be removed */
370 struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
371 unsigned int speed, unsigned int mode)
373 struct spi_slave *slave;
377 ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
385 void spi_free_slave(struct spi_slave *slave)
387 device_remove(slave->dev, DM_REMOVE_NORMAL);
391 int spi_slave_ofdata_to_platdata(const void *blob, int node,
392 struct dm_spi_slave_platdata *plat)
397 plat->cs = fdtdec_get_int(blob, node, "reg", -1);
398 plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
399 if (fdtdec_get_bool(blob, node, "spi-cpol"))
401 if (fdtdec_get_bool(blob, node, "spi-cpha"))
403 if (fdtdec_get_bool(blob, node, "spi-cs-high"))
405 if (fdtdec_get_bool(blob, node, "spi-3wire"))
407 if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
408 mode |= SPI_PREAMBLE;
410 /* Device DUAL/QUAD mode */
411 value = fdtdec_get_uint(blob, node, "spi-tx-bus-width", 1);
422 warn_non_spl("spi-tx-bus-width %d not supported\n", value);
426 value = fdtdec_get_uint(blob, node, "spi-rx-bus-width", 1);
437 warn_non_spl("spi-rx-bus-width %d not supported\n", value);
446 UCLASS_DRIVER(spi) = {
449 .flags = DM_UC_FLAG_SEQ_ALIAS,
450 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
451 .post_bind = dm_scan_fdt_dev,
453 .post_probe = spi_post_probe,
454 .child_pre_probe = spi_child_pre_probe,
455 .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
456 .per_child_auto_alloc_size = sizeof(struct spi_slave),
457 .per_child_platdata_auto_alloc_size =
458 sizeof(struct dm_spi_slave_platdata),
459 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
460 .child_post_bind = spi_child_post_bind,
464 UCLASS_DRIVER(spi_generic) = {
465 .id = UCLASS_SPI_GENERIC,
466 .name = "spi_generic",
469 U_BOOT_DRIVER(spi_generic_drv) = {
470 .name = "spi_generic_drv",
471 .id = UCLASS_SPI_GENERIC,