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 = dev_get_uclass_priv(bus);
57 speed = slave->max_hz;
60 speed = min(speed, (int)spi->max_hz);
66 if (speed != slave->speed) {
67 ret = spi_set_speed_mode(bus, speed, slave->mode);
73 return ops->claim_bus ? ops->claim_bus(dev) : 0;
76 void spi_release_bus(struct spi_slave *slave)
78 struct udevice *dev = slave->dev;
79 struct udevice *bus = dev->parent;
80 struct dm_spi_ops *ops = spi_get_ops(bus);
83 ops->release_bus(dev);
86 int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
87 const void *dout, void *din, unsigned long flags)
89 struct udevice *dev = slave->dev;
90 struct udevice *bus = dev->parent;
92 if (bus->uclass->uc_drv->id != UCLASS_SPI)
95 return spi_get_ops(bus)->xfer(dev, bitlen, dout, din, flags);
98 static int spi_post_bind(struct udevice *dev)
100 /* Scan the bus for devices */
101 return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
104 static int spi_child_post_bind(struct udevice *dev)
106 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
108 if (dev->of_offset == -1)
111 return spi_slave_ofdata_to_platdata(gd->fdt_blob, dev->of_offset, plat);
114 static int spi_post_probe(struct udevice *bus)
116 struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
118 spi->max_hz = fdtdec_get_int(gd->fdt_blob, bus->of_offset,
119 "spi-max-frequency", 0);
124 static int spi_child_pre_probe(struct udevice *dev)
126 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
127 struct spi_slave *slave = dev_get_parent_priv(dev);
130 * This is needed because we pass struct spi_slave around the place
131 * instead slave->dev (a struct udevice). So we have to have some
132 * way to access the slave udevice given struct spi_slave. Once we
133 * change the SPI API to use udevice instead of spi_slave, we can
138 slave->max_hz = plat->max_hz;
139 slave->mode = plat->mode;
144 int spi_chip_select(struct udevice *dev)
146 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
148 return plat ? plat->cs : -ENOENT;
151 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
155 for (device_find_first_child(bus, &dev); dev;
156 device_find_next_child(&dev)) {
157 struct dm_spi_slave_platdata *plat;
159 plat = dev_get_parent_platdata(dev);
160 debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
161 if (plat->cs == cs) {
170 int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
172 struct spi_cs_info info;
176 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
178 debug("%s: No bus %d\n", __func__, busnum);
182 return spi_cs_info(bus, cs, &info);
185 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
187 struct spi_cs_info local_info;
188 struct dm_spi_ops *ops;
194 /* If there is a device attached, return it */
196 ret = spi_find_chip_select(bus, cs, &info->dev);
201 * Otherwise ask the driver. For the moment we don't have CS info.
202 * When we do we could provide the driver with a helper function
203 * to figure out what chip selects are valid, or just handle the
206 ops = spi_get_ops(bus);
208 return ops->cs_info(bus, cs, info);
211 * We could assume there is at least one valid chip select, but best
212 * to be sure and return an error in this case. The driver didn't
213 * care enough to tell us.
218 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
219 struct udevice **devp)
221 struct udevice *bus, *dev;
224 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
226 debug("%s: No bus %d\n", __func__, busnum);
229 ret = spi_find_chip_select(bus, cs, &dev);
231 debug("%s: No cs %d\n", __func__, cs);
240 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
241 const char *drv_name, const char *dev_name,
242 struct udevice **busp, struct spi_slave **devp)
244 struct udevice *bus, *dev;
245 bool created = false;
248 ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
250 printf("Invalid bus %d (err=%d)\n", busnum, ret);
253 ret = spi_find_chip_select(bus, cs, &dev);
256 * If there is no such device, create one automatically. This means
257 * that we don't need a device tree node or platform data for the
258 * SPI flash chip - we will bind to the correct driver.
260 if (ret == -ENODEV && drv_name) {
261 struct dm_spi_slave_platdata *plat;
263 debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
264 __func__, dev_name, busnum, cs, drv_name);
265 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
268 plat = dev_get_parent_platdata(dev);
270 plat->max_hz = speed;
274 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
279 if (!device_active(dev)) {
280 struct spi_slave *slave;
282 ret = device_probe(dev);
285 slave = dev_get_parent_priv(dev);
289 ret = spi_set_speed_mode(bus, speed, mode);
294 *devp = dev_get_parent_priv(dev);
295 debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
300 debug("%s: Error path, credted=%d, device '%s'\n", __func__,
310 /* Compatibility function - to be removed */
311 struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
314 struct udevice *bus, *dev;
317 ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
320 ret = device_get_child_by_of_offset(bus, node, &dev);
323 return dev_get_parent_priv(dev);
326 /* Compatibility function - to be removed */
327 struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
328 unsigned int speed, unsigned int mode)
330 struct spi_slave *slave;
334 ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
342 void spi_free_slave(struct spi_slave *slave)
344 device_remove(slave->dev);
348 int spi_slave_ofdata_to_platdata(const void *blob, int node,
349 struct dm_spi_slave_platdata *plat)
353 plat->cs = fdtdec_get_int(blob, node, "reg", -1);
354 plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
355 if (fdtdec_get_bool(blob, node, "spi-cpol"))
357 if (fdtdec_get_bool(blob, node, "spi-cpha"))
359 if (fdtdec_get_bool(blob, node, "spi-cs-high"))
361 if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
362 mode |= SPI_PREAMBLE;
368 UCLASS_DRIVER(spi) = {
371 .flags = DM_UC_FLAG_SEQ_ALIAS,
372 .post_bind = spi_post_bind,
373 .post_probe = spi_post_probe,
374 .child_pre_probe = spi_child_pre_probe,
375 .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
376 .per_child_auto_alloc_size = sizeof(struct spi_slave),
377 .per_child_platdata_auto_alloc_size =
378 sizeof(struct dm_spi_slave_platdata),
379 .child_post_bind = spi_child_post_bind,
382 UCLASS_DRIVER(spi_generic) = {
383 .id = UCLASS_SPI_GENERIC,
384 .name = "spi_generic",
387 U_BOOT_DRIVER(spi_generic_drv) = {
388 .name = "spi_generic_drv",
389 .id = UCLASS_SPI_GENERIC,