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);
121 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
122 struct dm_spi_ops *ops = spi_get_ops(bus);
126 ops->claim_bus += gd->reloc_off;
127 if (ops->release_bus)
128 ops->release_bus += gd->reloc_off;
129 if (ops->set_wordlen)
130 ops->set_wordlen += gd->reloc_off;
132 ops->xfer += gd->reloc_off;
134 ops->set_speed += gd->reloc_off;
136 ops->set_mode += gd->reloc_off;
138 ops->cs_info += gd->reloc_off;
144 static int spi_child_pre_probe(struct udevice *dev)
146 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
147 struct spi_slave *slave = dev_get_parent_priv(dev);
150 * This is needed because we pass struct spi_slave around the place
151 * instead slave->dev (a struct udevice). So we have to have some
152 * way to access the slave udevice given struct spi_slave. Once we
153 * change the SPI API to use udevice instead of spi_slave, we can
158 slave->max_hz = plat->max_hz;
159 slave->mode = plat->mode;
164 int spi_chip_select(struct udevice *dev)
166 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
168 return plat ? plat->cs : -ENOENT;
171 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
175 for (device_find_first_child(bus, &dev); dev;
176 device_find_next_child(&dev)) {
177 struct dm_spi_slave_platdata *plat;
179 plat = dev_get_parent_platdata(dev);
180 debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
181 if (plat->cs == cs) {
190 int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
192 struct spi_cs_info info;
196 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
198 debug("%s: No bus %d\n", __func__, busnum);
202 return spi_cs_info(bus, cs, &info);
205 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
207 struct spi_cs_info local_info;
208 struct dm_spi_ops *ops;
214 /* If there is a device attached, return it */
216 ret = spi_find_chip_select(bus, cs, &info->dev);
221 * Otherwise ask the driver. For the moment we don't have CS info.
222 * When we do we could provide the driver with a helper function
223 * to figure out what chip selects are valid, or just handle the
226 ops = spi_get_ops(bus);
228 return ops->cs_info(bus, cs, info);
231 * We could assume there is at least one valid chip select, but best
232 * to be sure and return an error in this case. The driver didn't
233 * care enough to tell us.
238 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
239 struct udevice **devp)
241 struct udevice *bus, *dev;
244 ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
246 debug("%s: No bus %d\n", __func__, busnum);
249 ret = spi_find_chip_select(bus, cs, &dev);
251 debug("%s: No cs %d\n", __func__, cs);
260 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
261 const char *drv_name, const char *dev_name,
262 struct udevice **busp, struct spi_slave **devp)
264 struct udevice *bus, *dev;
265 bool created = false;
268 ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
270 printf("Invalid bus %d (err=%d)\n", busnum, ret);
273 ret = spi_find_chip_select(bus, cs, &dev);
276 * If there is no such device, create one automatically. This means
277 * that we don't need a device tree node or platform data for the
278 * SPI flash chip - we will bind to the correct driver.
280 if (ret == -ENODEV && drv_name) {
281 struct dm_spi_slave_platdata *plat;
283 debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
284 __func__, dev_name, busnum, cs, drv_name);
285 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
288 plat = dev_get_parent_platdata(dev);
290 plat->max_hz = speed;
294 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
299 if (!device_active(dev)) {
300 struct spi_slave *slave;
302 ret = device_probe(dev);
305 slave = dev_get_parent_priv(dev);
309 ret = spi_set_speed_mode(bus, speed, mode);
314 *devp = dev_get_parent_priv(dev);
315 debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
320 debug("%s: Error path, credted=%d, device '%s'\n", __func__,
330 /* Compatibility function - to be removed */
331 struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
334 struct udevice *bus, *dev;
337 ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
340 ret = device_get_child_by_of_offset(bus, node, &dev);
343 return dev_get_parent_priv(dev);
346 /* Compatibility function - to be removed */
347 struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
348 unsigned int speed, unsigned int mode)
350 struct spi_slave *slave;
354 ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
362 void spi_free_slave(struct spi_slave *slave)
364 device_remove(slave->dev);
368 int spi_slave_ofdata_to_platdata(const void *blob, int node,
369 struct dm_spi_slave_platdata *plat)
373 plat->cs = fdtdec_get_int(blob, node, "reg", -1);
374 plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
375 if (fdtdec_get_bool(blob, node, "spi-cpol"))
377 if (fdtdec_get_bool(blob, node, "spi-cpha"))
379 if (fdtdec_get_bool(blob, node, "spi-cs-high"))
381 if (fdtdec_get_bool(blob, node, "spi-3wire"))
383 if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
384 mode |= SPI_PREAMBLE;
390 UCLASS_DRIVER(spi) = {
393 .flags = DM_UC_FLAG_SEQ_ALIAS,
394 .post_bind = spi_post_bind,
395 .post_probe = spi_post_probe,
396 .child_pre_probe = spi_child_pre_probe,
397 .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
398 .per_child_auto_alloc_size = sizeof(struct spi_slave),
399 .per_child_platdata_auto_alloc_size =
400 sizeof(struct dm_spi_slave_platdata),
401 .child_post_bind = spi_child_post_bind,
404 UCLASS_DRIVER(spi_generic) = {
405 .id = UCLASS_SPI_GENERIC,
406 .name = "spi_generic",
409 U_BOOT_DRIVER(spi_generic_drv) = {
410 .name = "spi_generic_drv",
411 .id = UCLASS_SPI_GENERIC,