u-boot/drivers/spi/sandbox_spi.c
Tom Rini d024236e5a Remove unnecessary instances of DECLARE_GLOBAL_DATA_PTR
We have a large number of places where while we historically referenced
gd in the code we no longer do, as well as cases where the code added
that line "just in case" during development and never dropped it.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-04-27 14:54:48 -04:00

162 lines
3.5 KiB
C

/*
* Simulate a SPI port
*
* Copyright (c) 2011-2013 The Chromium OS Authors.
* See file CREDITS for list of people who contributed to this
* project.
*
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <spi.h>
#include <spi_flash.h>
#include <os.h>
#include <linux/errno.h>
#include <asm/spi.h>
#include <asm/state.h>
#include <dm/device-internal.h>
#ifndef CONFIG_SPI_IDLE_VAL
# define CONFIG_SPI_IDLE_VAL 0xFF
#endif
const char *sandbox_spi_parse_spec(const char *arg, unsigned long *bus,
unsigned long *cs)
{
char *endp;
*bus = simple_strtoul(arg, &endp, 0);
if (*endp != ':' || *bus >= CONFIG_SANDBOX_SPI_MAX_BUS)
return NULL;
*cs = simple_strtoul(endp + 1, &endp, 0);
if (*endp != ':' || *cs >= CONFIG_SANDBOX_SPI_MAX_CS)
return NULL;
return endp + 1;
}
__weak int sandbox_spi_get_emul(struct sandbox_state *state,
struct udevice *bus, struct udevice *slave,
struct udevice **emulp)
{
return -ENOENT;
}
static int sandbox_spi_xfer(struct udevice *slave, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
struct udevice *bus = slave->parent;
struct sandbox_state *state = state_get_current();
struct dm_spi_emul_ops *ops;
struct udevice *emul;
uint bytes = bitlen / 8, i;
int ret;
u8 *tx = (void *)dout, *rx = din;
uint busnum, cs;
if (bitlen == 0)
return 0;
/* we can only do 8 bit transfers */
if (bitlen % 8) {
printf("sandbox_spi: xfer: invalid bitlen size %u; needs to be 8bit\n",
bitlen);
return -EINVAL;
}
busnum = bus->seq;
cs = spi_chip_select(slave);
if (busnum >= CONFIG_SANDBOX_SPI_MAX_BUS ||
cs >= CONFIG_SANDBOX_SPI_MAX_CS) {
printf("%s: busnum=%u, cs=%u: out of range\n", __func__,
busnum, cs);
return -ENOENT;
}
ret = sandbox_spi_get_emul(state, bus, slave, &emul);
if (ret) {
printf("%s: busnum=%u, cs=%u: no emulation available (err=%d)\n",
__func__, busnum, cs, ret);
return -ENOENT;
}
ret = device_probe(emul);
if (ret)
return ret;
/* make sure rx/tx buffers are full so clients can assume */
if (!tx) {
debug("sandbox_spi: xfer: auto-allocating tx scratch buffer\n");
tx = malloc(bytes);
if (!tx) {
debug("sandbox_spi: Out of memory\n");
return -ENOMEM;
}
}
if (!rx) {
debug("sandbox_spi: xfer: auto-allocating rx scratch buffer\n");
rx = malloc(bytes);
if (!rx) {
debug("sandbox_spi: Out of memory\n");
return -ENOMEM;
}
}
ops = spi_emul_get_ops(emul);
ret = ops->xfer(emul, bitlen, dout, din, flags);
debug("sandbox_spi: xfer: got back %i (that's %s)\n rx:",
ret, ret ? "bad" : "good");
for (i = 0; i < bytes; ++i)
debug(" %u:%02x", i, rx[i]);
debug("\n");
if (tx != dout)
free(tx);
if (rx != din)
free(rx);
return ret;
}
static int sandbox_spi_set_speed(struct udevice *bus, uint speed)
{
return 0;
}
static int sandbox_spi_set_mode(struct udevice *bus, uint mode)
{
return 0;
}
static int sandbox_cs_info(struct udevice *bus, uint cs,
struct spi_cs_info *info)
{
/* Always allow activity on CS 0 */
if (cs >= 1)
return -ENODEV;
return 0;
}
static const struct dm_spi_ops sandbox_spi_ops = {
.xfer = sandbox_spi_xfer,
.set_speed = sandbox_spi_set_speed,
.set_mode = sandbox_spi_set_mode,
.cs_info = sandbox_cs_info,
};
static const struct udevice_id sandbox_spi_ids[] = {
{ .compatible = "sandbox,spi" },
{ }
};
U_BOOT_DRIVER(spi_sandbox) = {
.name = "spi_sandbox",
.id = UCLASS_SPI,
.of_match = sandbox_spi_ids,
.ops = &sandbox_spi_ops,
};