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![Ovidiu Panait](/assets/img/avatar_default.png)
Introduce sandbox_spi_get_{speed, mode} public interface to retrieve the sandbox spi bus internal state. They are meant to be used in sandbox spi testcases. Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com> Reviewed-by: Simon Glass <sjg@chromium.org>
180 lines
3.9 KiB
C
180 lines
3.9 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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#define LOG_CATEGORY UCLASS_SPI
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#include <common.h>
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#include <dm.h>
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#include <log.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 <linux/errno.h>
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#include <asm/spi.h>
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#include <asm/state.h>
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#include <dm/acpi.h>
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#include <dm/device-internal.h>
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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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/**
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* struct sandbox_spi_priv - Sandbox SPI private data
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*
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* Helper struct to keep track of the sandbox SPI bus internal state. It is
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* used in unit tests to verify that dm spi functions update the bus
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* speed/mode properly (for instance, when jumping back and forth between spi
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* slaves claiming the bus, we need to make sure that the bus speed is updated
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* accordingly for each slave).
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*
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* @speed: Current bus speed.
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* @mode: Current bus mode.
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*/
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struct sandbox_spi_priv {
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uint speed;
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uint mode;
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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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uint sandbox_spi_get_speed(struct udevice *dev)
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{
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struct sandbox_spi_priv *priv = dev_get_priv(dev);
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return priv->speed;
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}
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uint sandbox_spi_get_mode(struct udevice *dev)
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{
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struct sandbox_spi_priv *priv = dev_get_priv(dev);
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return priv->mode;
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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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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 = dev_seq(bus);
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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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ops = spi_emul_get_ops(emul);
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ret = ops->xfer(emul, bitlen, dout, din, flags);
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log_content("sandbox_spi: xfer: got back %i (that's %s)\n rx:",
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ret, ret ? "bad" : "good");
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if (din) {
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for (i = 0; i < bytes; ++i)
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log_content(" %u:%02x", i, ((u8 *)din)[i]);
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}
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log_content("\n");
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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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struct sandbox_spi_priv *priv = dev_get_priv(bus);
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priv->speed = speed;
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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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struct sandbox_spi_priv *priv = dev_get_priv(bus);
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priv->mode = mode;
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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, CS 1 */
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if (cs >= 2)
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return -EINVAL;
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return 0;
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}
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static int sandbox_spi_get_mmap(struct udevice *dev, ulong *map_basep,
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uint *map_sizep, uint *offsetp)
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{
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*map_basep = 0x1000;
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*map_sizep = 0x2000;
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*offsetp = 0x100;
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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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.get_mmap = sandbox_spi_get_mmap,
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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(sandbox_spi) = {
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.name = "sandbox_spi",
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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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.priv_auto = sizeof(struct sandbox_spi_priv),
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};
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