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_chip_select(struct udevice *dev)
113 struct spi_slave *slave = dev_get_parentdata(dev);
115 return slave ? slave->cs : -ENOENT;
118 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
122 for (device_find_first_child(bus, &dev); dev;
123 device_find_next_child(&dev)) {
124 struct spi_slave store;
125 struct spi_slave *slave = dev_get_parentdata(dev);
129 spi_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
132 debug("%s: slave=%p, cs=%d\n", __func__, slave,
133 slave ? slave->cs : -1);
134 if (slave && slave->cs == cs) {
143 int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
145 struct spi_cs_info info;
149 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
151 debug("%s: No bus %d\n", __func__, busnum);
155 return spi_cs_info(bus, cs, &info);
158 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
160 struct spi_cs_info local_info;
161 struct dm_spi_ops *ops;
167 /* If there is a device attached, return it */
169 ret = spi_find_chip_select(bus, cs, &info->dev);
174 * Otherwise ask the driver. For the moment we don't have CS info.
175 * When we do we could provide the driver with a helper function
176 * to figure out what chip selects are valid, or just handle the
179 ops = spi_get_ops(bus);
181 return ops->cs_info(bus, cs, info);
184 * We could assume there is at least one valid chip select, but best
185 * to be sure and return an error in this case. The driver didn't
186 * care enough to tell us.
191 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
192 struct udevice **devp)
194 struct udevice *bus, *dev;
197 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
199 debug("%s: No bus %d\n", __func__, busnum);
202 ret = spi_find_chip_select(bus, cs, &dev);
204 debug("%s: No cs %d\n", __func__, cs);
213 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
214 const char *drv_name, const char *dev_name,
215 struct udevice **busp, struct spi_slave **devp)
217 struct udevice *bus, *dev;
218 struct spi_slave *slave;
219 bool created = false;
222 ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
224 printf("Invalid bus %d (err=%d)\n", busnum, ret);
227 ret = spi_find_chip_select(bus, cs, &dev);
230 * If there is no such device, create one automatically. This means
231 * that we don't need a device tree node or platform data for the
232 * SPI flash chip - we will bind to the correct driver.
234 if (ret == -ENODEV && drv_name) {
235 debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
236 __func__, dev_name, busnum, cs, drv_name);
237 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
242 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
247 if (!device_active(dev)) {
248 slave = (struct spi_slave *)calloc(1,
249 sizeof(struct spi_slave));
255 ret = spi_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
261 ret = device_probe_child(dev, slave);
267 ret = spi_set_speed_mode(bus, speed, mode);
272 *devp = dev_get_parentdata(dev);
273 debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
286 /* Compatibility function - to be removed */
287 struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
290 struct udevice *bus, *dev;
293 ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
296 ret = device_get_child_by_of_offset(bus, node, &dev);
299 return dev_get_parentdata(dev);
302 /* Compatibility function - to be removed */
303 struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
304 unsigned int speed, unsigned int mode)
306 struct spi_slave *slave;
310 ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
318 void spi_free_slave(struct spi_slave *slave)
320 device_remove(slave->dev);
324 int spi_ofdata_to_platdata(const void *blob, int node,
325 struct spi_slave *spi)
329 spi->cs = fdtdec_get_int(blob, node, "reg", -1);
330 spi->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
331 if (fdtdec_get_bool(blob, node, "spi-cpol"))
333 if (fdtdec_get_bool(blob, node, "spi-cpha"))
335 if (fdtdec_get_bool(blob, node, "spi-cs-high"))
337 if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
338 mode |= SPI_PREAMBLE;
344 UCLASS_DRIVER(spi) = {
347 .post_bind = spi_post_bind,
348 .post_probe = spi_post_probe,
349 .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
352 UCLASS_DRIVER(spi_generic) = {
353 .id = UCLASS_SPI_GENERIC,
354 .name = "spi_generic",
357 U_BOOT_DRIVER(spi_generic_drv) = {
358 .name = "spi_generic_drv",
359 .id = UCLASS_SPI_GENERIC,