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_child_post_bind(struct udevice *dev)
103 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
105 if (dev->of_offset == -1)
108 return spi_slave_ofdata_to_platdata(gd->fdt_blob, dev->of_offset, plat);
111 int spi_post_probe(struct udevice *bus)
113 struct dm_spi_bus *spi = bus->uclass_priv;
115 spi->max_hz = fdtdec_get_int(gd->fdt_blob, bus->of_offset,
116 "spi-max-frequency", 0);
121 int spi_child_pre_probe(struct udevice *dev)
123 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
124 struct spi_slave *slave = dev_get_parentdata(dev);
127 * This is needed because we pass struct spi_slave around the place
128 * instead slave->dev (a struct udevice). So we have to have some
129 * way to access the slave udevice given struct spi_slave. Once we
130 * change the SPI API to use udevice instead of spi_slave, we can
135 slave->max_hz = plat->max_hz;
136 slave->mode = plat->mode;
141 int spi_chip_select(struct udevice *dev)
143 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
145 return plat ? plat->cs : -ENOENT;
148 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
152 for (device_find_first_child(bus, &dev); dev;
153 device_find_next_child(&dev)) {
154 struct dm_spi_slave_platdata *plat;
156 plat = dev_get_parent_platdata(dev);
157 debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
158 if (plat->cs == cs) {
167 int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
169 struct spi_cs_info info;
173 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
175 debug("%s: No bus %d\n", __func__, busnum);
179 return spi_cs_info(bus, cs, &info);
182 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
184 struct spi_cs_info local_info;
185 struct dm_spi_ops *ops;
191 /* If there is a device attached, return it */
193 ret = spi_find_chip_select(bus, cs, &info->dev);
198 * Otherwise ask the driver. For the moment we don't have CS info.
199 * When we do we could provide the driver with a helper function
200 * to figure out what chip selects are valid, or just handle the
203 ops = spi_get_ops(bus);
205 return ops->cs_info(bus, cs, info);
208 * We could assume there is at least one valid chip select, but best
209 * to be sure and return an error in this case. The driver didn't
210 * care enough to tell us.
215 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
216 struct udevice **devp)
218 struct udevice *bus, *dev;
221 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
223 debug("%s: No bus %d\n", __func__, busnum);
226 ret = spi_find_chip_select(bus, cs, &dev);
228 debug("%s: No cs %d\n", __func__, cs);
237 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
238 const char *drv_name, const char *dev_name,
239 struct udevice **busp, struct spi_slave **devp)
241 struct udevice *bus, *dev;
242 bool created = false;
245 ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
247 printf("Invalid bus %d (err=%d)\n", busnum, ret);
250 ret = spi_find_chip_select(bus, cs, &dev);
253 * If there is no such device, create one automatically. This means
254 * that we don't need a device tree node or platform data for the
255 * SPI flash chip - we will bind to the correct driver.
257 if (ret == -ENODEV && drv_name) {
258 struct dm_spi_slave_platdata *plat;
260 debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
261 __func__, dev_name, busnum, cs, drv_name);
262 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
265 plat = dev_get_parent_platdata(dev);
267 plat->max_hz = speed;
271 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
276 if (!device_active(dev)) {
277 struct spi_slave *slave;
279 ret = device_probe(dev);
282 slave = dev_get_parentdata(dev);
286 ret = spi_set_speed_mode(bus, speed, mode);
291 *devp = dev_get_parentdata(dev);
292 debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
297 debug("%s: Error path, credted=%d, device '%s'\n", __func__,
307 /* Compatibility function - to be removed */
308 struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
311 struct udevice *bus, *dev;
314 ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
317 ret = device_get_child_by_of_offset(bus, node, &dev);
320 return dev_get_parentdata(dev);
323 /* Compatibility function - to be removed */
324 struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
325 unsigned int speed, unsigned int mode)
327 struct spi_slave *slave;
331 ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
339 void spi_free_slave(struct spi_slave *slave)
341 device_remove(slave->dev);
345 int spi_slave_ofdata_to_platdata(const void *blob, int node,
346 struct dm_spi_slave_platdata *plat)
350 plat->cs = fdtdec_get_int(blob, node, "reg", -1);
351 plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
352 if (fdtdec_get_bool(blob, node, "spi-cpol"))
354 if (fdtdec_get_bool(blob, node, "spi-cpha"))
356 if (fdtdec_get_bool(blob, node, "spi-cs-high"))
358 if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
359 mode |= SPI_PREAMBLE;
365 UCLASS_DRIVER(spi) = {
368 .flags = DM_UC_FLAG_SEQ_ALIAS,
369 .post_bind = spi_post_bind,
370 .post_probe = spi_post_probe,
371 .child_pre_probe = spi_child_pre_probe,
372 .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
373 .per_child_auto_alloc_size = sizeof(struct spi_slave),
374 .per_child_platdata_auto_alloc_size =
375 sizeof(struct dm_spi_slave_platdata),
376 .child_post_bind = spi_child_post_bind,
379 UCLASS_DRIVER(spi_generic) = {
380 .id = UCLASS_SPI_GENERIC,
381 .name = "spi_generic",
384 U_BOOT_DRIVER(spi_generic_drv) = {
385 .name = "spi_generic_drv",
386 .id = UCLASS_SPI_GENERIC,