mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-27 04:18:51 +09:00
![Simon Glass](/assets/img/avatar_default.png)
This driver includes some test features such as only supporting certain bus speeds. It passes its I2C traffic through to an emulator. Acked-by: Heiko Schocher <hs@denx.de> Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
112 lines
2.3 KiB
C
112 lines
2.3 KiB
C
/*
|
|
* Simulate an I2C port
|
|
*
|
|
* Copyright (c) 2014 Google, Inc
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <fdtdec.h>
|
|
#include <i2c.h>
|
|
#include <asm/test.h>
|
|
#include <dm/lists.h>
|
|
#include <dm/device-internal.h>
|
|
#include <dm/root.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
struct dm_sandbox_i2c_emul_priv {
|
|
struct udevice *emul;
|
|
};
|
|
|
|
static int get_emul(struct udevice *dev, struct udevice **devp,
|
|
struct dm_i2c_ops **opsp)
|
|
{
|
|
struct dm_i2c_chip *priv;
|
|
int ret;
|
|
|
|
*devp = NULL;
|
|
*opsp = NULL;
|
|
priv = dev_get_parentdata(dev);
|
|
if (!priv->emul) {
|
|
ret = dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset,
|
|
false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = device_get_child(dev, 0, &priv->emul);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
*devp = priv->emul;
|
|
*opsp = i2c_get_ops(priv->emul);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
|
|
int nmsgs)
|
|
{
|
|
struct dm_i2c_bus *i2c = bus->uclass_priv;
|
|
struct dm_i2c_ops *ops;
|
|
struct udevice *emul, *dev;
|
|
bool is_read;
|
|
int ret;
|
|
|
|
/* Special test code to return success but with no emulation */
|
|
if (msg->addr == SANDBOX_I2C_TEST_ADDR)
|
|
return 0;
|
|
|
|
ret = i2c_get_chip(bus, msg->addr, &dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = get_emul(dev, &emul, &ops);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* For testing, don't allow writing above 100KHz for writes and
|
|
* 400KHz for reads
|
|
*/
|
|
is_read = nmsgs > 1;
|
|
if (i2c->speed_hz > (is_read ? 400000 : 100000))
|
|
return -EINVAL;
|
|
return ops->xfer(emul, msg, nmsgs);
|
|
}
|
|
|
|
static const struct dm_i2c_ops sandbox_i2c_ops = {
|
|
.xfer = sandbox_i2c_xfer,
|
|
};
|
|
|
|
static int sandbox_i2c_child_pre_probe(struct udevice *dev)
|
|
{
|
|
struct dm_i2c_chip *i2c_chip = dev_get_parentdata(dev);
|
|
|
|
/* Ignore our test address */
|
|
if (i2c_chip->chip_addr == SANDBOX_I2C_TEST_ADDR)
|
|
return 0;
|
|
if (dev->of_offset == -1)
|
|
return 0;
|
|
|
|
return i2c_chip_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
|
|
i2c_chip);
|
|
}
|
|
|
|
static const struct udevice_id sandbox_i2c_ids[] = {
|
|
{ .compatible = "sandbox,i2c" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(i2c_sandbox) = {
|
|
.name = "i2c_sandbox",
|
|
.id = UCLASS_I2C,
|
|
.of_match = sandbox_i2c_ids,
|
|
.per_child_auto_alloc_size = sizeof(struct dm_i2c_chip),
|
|
.child_pre_probe = sandbox_i2c_child_pre_probe,
|
|
.ops = &sandbox_i2c_ops,
|
|
};
|