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>
19 DECLARE_GLOBAL_DATA_PTR;
21 static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
23 struct dm_spi_ops *ops;
26 ops = spi_get_ops(bus);
28 ret = ops->set_speed(bus, speed);
32 printf("Cannot set speed (err=%d)\n", ret);
37 ret = ops->set_mode(bus, mode);
41 printf("Cannot set mode (err=%d)\n", ret);
48 int spi_claim_bus(struct spi_slave *slave)
50 struct udevice *dev = slave->dev;
51 struct udevice *bus = dev->parent;
52 struct dm_spi_ops *ops = spi_get_ops(bus);
53 struct dm_spi_bus *spi = bus->uclass_priv;
57 speed = slave->max_hz;
60 speed = min(speed, (int)spi->max_hz);
66 ret = spi_set_speed_mode(bus, speed, slave->mode);
70 return ops->claim_bus ? ops->claim_bus(bus) : 0;
73 void spi_release_bus(struct spi_slave *slave)
75 struct udevice *dev = slave->dev;
76 struct udevice *bus = dev->parent;
77 struct dm_spi_ops *ops = spi_get_ops(bus);
80 ops->release_bus(bus);
83 int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
84 const void *dout, void *din, unsigned long flags)
86 struct udevice *dev = slave->dev;
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_post_bind(struct udevice *dev)
97 /* Scan the bus for devices */
98 return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
101 int spi_post_probe(struct udevice *dev)
103 struct dm_spi_bus *spi = dev->uclass_priv;
105 spi->max_hz = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
106 "spi-max-frequency", 0);
111 int spi_child_pre_probe(struct udevice *dev)
113 struct spi_slave *slave = dev_get_parentdata(dev);
120 int spi_chip_select(struct udevice *dev)
122 struct spi_slave *slave = dev_get_parentdata(dev);
124 return slave ? slave->cs : -ENOENT;
127 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
131 for (device_find_first_child(bus, &dev); dev;
132 device_find_next_child(&dev)) {
133 struct spi_slave store;
134 struct spi_slave *slave = dev_get_parentdata(dev);
138 spi_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
141 debug("%s: slave=%p, cs=%d\n", __func__, slave,
142 slave ? slave->cs : -1);
143 if (slave && slave->cs == cs) {
152 int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
154 struct spi_cs_info info;
158 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
160 debug("%s: No bus %d\n", __func__, busnum);
164 return spi_cs_info(bus, cs, &info);
167 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
169 struct spi_cs_info local_info;
170 struct dm_spi_ops *ops;
176 /* If there is a device attached, return it */
178 ret = spi_find_chip_select(bus, cs, &info->dev);
183 * Otherwise ask the driver. For the moment we don't have CS info.
184 * When we do we could provide the driver with a helper function
185 * to figure out what chip selects are valid, or just handle the
188 ops = spi_get_ops(bus);
190 return ops->cs_info(bus, cs, info);
193 * We could assume there is at least one valid chip select, but best
194 * to be sure and return an error in this case. The driver didn't
195 * care enough to tell us.
200 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
201 struct udevice **devp)
203 struct udevice *bus, *dev;
206 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
208 debug("%s: No bus %d\n", __func__, busnum);
211 ret = spi_find_chip_select(bus, cs, &dev);
213 debug("%s: No cs %d\n", __func__, cs);
222 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
223 const char *drv_name, const char *dev_name,
224 struct udevice **busp, struct spi_slave **devp)
226 struct udevice *bus, *dev;
227 struct spi_slave *slave;
228 bool created = false;
231 ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
233 printf("Invalid bus %d (err=%d)\n", busnum, ret);
236 ret = spi_find_chip_select(bus, cs, &dev);
239 * If there is no such device, create one automatically. This means
240 * that we don't need a device tree node or platform data for the
241 * SPI flash chip - we will bind to the correct driver.
243 if (ret == -ENODEV && drv_name) {
244 debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
245 __func__, dev_name, busnum, cs, drv_name);
246 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
251 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
256 if (!device_active(dev)) {
257 slave = (struct spi_slave *)calloc(1,
258 sizeof(struct spi_slave));
264 ret = spi_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
270 ret = device_probe_child(dev, slave);
276 ret = spi_set_speed_mode(bus, speed, mode);
281 *devp = dev_get_parentdata(dev);
282 debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
295 /* Compatibility function - to be removed */
296 struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
299 struct udevice *bus, *dev;
302 ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
305 ret = device_get_child_by_of_offset(bus, node, &dev);
308 return dev_get_parentdata(dev);
311 /* Compatibility function - to be removed */
312 struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
313 unsigned int speed, unsigned int mode)
315 struct spi_slave *slave;
319 ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
327 void spi_free_slave(struct spi_slave *slave)
329 device_remove(slave->dev);
333 int spi_ofdata_to_platdata(const void *blob, int node,
334 struct spi_slave *spi)
338 spi->cs = fdtdec_get_int(blob, node, "reg", -1);
339 spi->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
340 if (fdtdec_get_bool(blob, node, "spi-cpol"))
342 if (fdtdec_get_bool(blob, node, "spi-cpha"))
344 if (fdtdec_get_bool(blob, node, "spi-cs-high"))
346 if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
347 mode |= SPI_PREAMBLE;
353 UCLASS_DRIVER(spi) = {
356 .flags = DM_UC_FLAG_SEQ_ALIAS,
357 .post_bind = spi_post_bind,
358 .post_probe = spi_post_probe,
359 .child_pre_probe = spi_child_pre_probe,
360 .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
361 .per_child_auto_alloc_size = sizeof(struct spi_slave),
364 UCLASS_DRIVER(spi_generic) = {
365 .id = UCLASS_SPI_GENERIC,
366 .name = "spi_generic",
369 U_BOOT_DRIVER(spi_generic_drv) = {
370 .name = "spi_generic_drv",
371 .id = UCLASS_SPI_GENERIC,