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