4 * Copyright (c) 2011-2013 The Chromium OS Authors.
5 * See file CREDITS for list of people who contributed to this
8 * Licensed under the GPL-2 or later.
11 #define LOG_CATEGORY UCLASS_SPI
18 #include <spi_flash.h>
21 #include <linux/errno.h>
23 #include <asm/state.h>
25 #include <dm/device-internal.h>
28 * struct sandbox_spi_priv - Sandbox SPI private data
30 * Helper struct to keep track of the sandbox SPI bus internal state. It is
31 * used in unit tests to verify that dm spi functions update the bus
32 * speed/mode properly (for instance, when jumping back and forth between spi
33 * slaves claiming the bus, we need to make sure that the bus speed is updated
34 * accordingly for each slave).
36 * @speed: Current bus speed.
37 * @mode: Current bus mode.
39 struct sandbox_spi_priv {
44 __weak int sandbox_spi_get_emul(struct sandbox_state *state,
45 struct udevice *bus, struct udevice *slave,
46 struct udevice **emulp)
51 uint sandbox_spi_get_speed(struct udevice *dev)
53 struct sandbox_spi_priv *priv = dev_get_priv(dev);
58 uint sandbox_spi_get_mode(struct udevice *dev)
60 struct sandbox_spi_priv *priv = dev_get_priv(dev);
65 static int sandbox_spi_xfer(struct udevice *slave, unsigned int bitlen,
66 const void *dout, void *din, unsigned long flags)
68 struct udevice *bus = slave->parent;
69 struct sandbox_state *state = state_get_current();
70 struct dm_spi_emul_ops *ops;
72 uint bytes = bitlen / 8, i;
79 /* we can only do 8 bit transfers */
81 printf("sandbox_spi: xfer: invalid bitlen size %u; needs to be 8bit\n",
86 busnum = dev_seq(bus);
87 cs = spi_chip_select(slave);
88 if (busnum >= CONFIG_SANDBOX_SPI_MAX_BUS ||
89 cs >= CONFIG_SANDBOX_SPI_MAX_CS) {
90 printf("%s: busnum=%u, cs=%u: out of range\n", __func__,
94 ret = sandbox_spi_get_emul(state, bus, slave, &emul);
96 printf("%s: busnum=%u, cs=%u: no emulation available (err=%d)\n",
97 __func__, busnum, cs, ret);
100 ret = device_probe(emul);
104 ops = spi_emul_get_ops(emul);
105 ret = ops->xfer(emul, bitlen, dout, din, flags);
107 log_content("sandbox_spi: xfer: got back %i (that's %s)\n rx:",
108 ret, ret ? "bad" : "good");
110 for (i = 0; i < bytes; ++i)
111 log_content(" %u:%02x", i, ((u8 *)din)[i]);
118 static int sandbox_spi_set_speed(struct udevice *bus, uint speed)
120 struct sandbox_spi_priv *priv = dev_get_priv(bus);
127 static int sandbox_spi_set_mode(struct udevice *bus, uint mode)
129 struct sandbox_spi_priv *priv = dev_get_priv(bus);
136 static int sandbox_cs_info(struct udevice *bus, uint cs,
137 struct spi_cs_info *info)
139 /* Always allow activity on CS 0, CS 1 */
146 static int sandbox_spi_get_mmap(struct udevice *dev, ulong *map_basep,
147 uint *map_sizep, uint *offsetp)
156 static const struct dm_spi_ops sandbox_spi_ops = {
157 .xfer = sandbox_spi_xfer,
158 .set_speed = sandbox_spi_set_speed,
159 .set_mode = sandbox_spi_set_mode,
160 .cs_info = sandbox_cs_info,
161 .get_mmap = sandbox_spi_get_mmap,
164 static const struct udevice_id sandbox_spi_ids[] = {
165 { .compatible = "sandbox,spi" },
169 U_BOOT_DRIVER(sandbox_spi) = {
170 .name = "sandbox_spi",
172 .of_match = sandbox_spi_ids,
173 .ops = &sandbox_spi_ops,
174 .priv_auto = sizeof(struct sandbox_spi_priv),