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 static int spi_child_post_bind(struct udevice *dev)
113 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
115 if (dev->of_offset == -1)
118 return spi_slave_ofdata_to_platdata(gd->fdt_blob, dev->of_offset, plat);
121 static int spi_post_probe(struct udevice *bus)
123 struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
125 spi->max_hz = fdtdec_get_int(gd->fdt_blob, bus->of_offset,
126 "spi-max-frequency", 0);
128 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
129 struct dm_spi_ops *ops = spi_get_ops(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;
139 ops->xfer += gd->reloc_off;
141 ops->set_speed += gd->reloc_off;
143 ops->set_mode += gd->reloc_off;
145 ops->cs_info += gd->reloc_off;
151 static int spi_child_pre_probe(struct udevice *dev)
153 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
154 struct spi_slave *slave = dev_get_parent_priv(dev);
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
165 slave->max_hz = plat->max_hz;
166 slave->mode = plat->mode;
167 slave->mode_rx = plat->mode_rx;
168 slave->wordlen = SPI_DEFAULT_WORDLEN;
173 int spi_chip_select(struct udevice *dev)
175 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
177 return plat ? plat->cs : -ENOENT;
180 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
184 for (device_find_first_child(bus, &dev); dev;
185 device_find_next_child(&dev)) {
186 struct dm_spi_slave_platdata *plat;
188 plat = dev_get_parent_platdata(dev);
189 debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
190 if (plat->cs == cs) {
199 int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
201 struct spi_cs_info info;
205 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
207 debug("%s: No bus %d\n", __func__, busnum);
211 return spi_cs_info(bus, cs, &info);
214 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
216 struct spi_cs_info local_info;
217 struct dm_spi_ops *ops;
223 /* If there is a device attached, return it */
225 ret = spi_find_chip_select(bus, cs, &info->dev);
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
235 ops = spi_get_ops(bus);
237 return ops->cs_info(bus, cs, info);
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.
247 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
248 struct udevice **devp)
250 struct udevice *bus, *dev;
253 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
255 debug("%s: No bus %d\n", __func__, busnum);
258 ret = spi_find_chip_select(bus, cs, &dev);
260 debug("%s: No cs %d\n", __func__, cs);
269 int 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)
273 struct udevice *bus, *dev;
274 struct dm_spi_slave_platdata *plat;
275 bool created = false;
278 ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
280 printf("Invalid bus %d (err=%d)\n", busnum, ret);
283 ret = spi_find_chip_select(bus, cs, &dev);
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.
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);
293 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
296 plat = dev_get_parent_platdata(dev);
298 plat->max_hz = speed;
302 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
307 if (!device_active(dev)) {
308 struct spi_slave *slave;
310 ret = device_probe(dev);
313 slave = dev_get_parent_priv(dev);
317 plat = dev_get_parent_platdata(dev);
319 speed = plat->max_hz;
322 ret = spi_set_speed_mode(bus, speed, mode);
327 *devp = dev_get_parent_priv(dev);
328 debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
333 debug("%s: Error path, created=%d, device '%s'\n", __func__,
343 /* Compatibility function - to be removed */
344 struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
347 struct udevice *bus, *dev;
350 ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
353 ret = device_get_child_by_of_offset(bus, node, &dev);
356 return dev_get_parent_priv(dev);
359 /* Compatibility function - to be removed */
360 struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
361 unsigned int speed, unsigned int mode)
363 struct spi_slave *slave;
367 ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
375 void spi_free_slave(struct spi_slave *slave)
377 device_remove(slave->dev);
381 int spi_slave_ofdata_to_platdata(const void *blob, int node,
382 struct dm_spi_slave_platdata *plat)
384 int mode = 0, mode_rx = 0;
387 plat->cs = fdtdec_get_int(blob, node, "reg", -1);
388 plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
389 if (fdtdec_get_bool(blob, node, "spi-cpol"))
391 if (fdtdec_get_bool(blob, node, "spi-cpha"))
393 if (fdtdec_get_bool(blob, node, "spi-cs-high"))
395 if (fdtdec_get_bool(blob, node, "spi-3wire"))
397 if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
398 mode |= SPI_PREAMBLE;
400 /* Device DUAL/QUAD mode */
401 value = fdtdec_get_uint(blob, node, "spi-tx-bus-width", 1);
412 error("spi-tx-bus-width %d not supported\n", value);
418 value = fdtdec_get_uint(blob, node, "spi-rx-bus-width", 1);
423 mode_rx |= SPI_RX_DUAL;
426 mode_rx |= SPI_RX_QUAD;
429 error("spi-rx-bus-width %d not supported\n", value);
433 plat->mode_rx = mode_rx;
438 UCLASS_DRIVER(spi) = {
441 .flags = DM_UC_FLAG_SEQ_ALIAS,
442 .post_bind = dm_scan_fdt_dev,
443 .post_probe = spi_post_probe,
444 .child_pre_probe = spi_child_pre_probe,
445 .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
446 .per_child_auto_alloc_size = sizeof(struct spi_slave),
447 .per_child_platdata_auto_alloc_size =
448 sizeof(struct dm_spi_slave_platdata),
449 .child_post_bind = spi_child_post_bind,
452 UCLASS_DRIVER(spi_generic) = {
453 .id = UCLASS_SPI_GENERIC,
454 .name = "spi_generic",
457 U_BOOT_DRIVER(spi_generic_drv) = {
458 .name = "spi_generic_drv",
459 .id = UCLASS_SPI_GENERIC,