forked from rrcarlosr/Jetpack
124 lines
2.4 KiB
C
124 lines
2.4 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 sandbox_i2c_priv {
|
||
|
|
bool test_mode;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int get_emul(struct udevice *dev, struct udevice **devp,
|
||
|
|
struct dm_i2c_ops **opsp)
|
||
|
|
{
|
||
|
|
struct dm_i2c_chip *plat;
|
||
|
|
struct udevice *child;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
*devp = NULL;
|
||
|
|
*opsp = NULL;
|
||
|
|
plat = dev_get_parent_platdata(dev);
|
||
|
|
if (!plat->emul) {
|
||
|
|
ret = dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset,
|
||
|
|
false);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
for (device_find_first_child(dev, &child); child;
|
||
|
|
device_find_next_child(&child)) {
|
||
|
|
if (device_get_uclass_id(child) != UCLASS_I2C_EMUL)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
ret = device_probe(child);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (child)
|
||
|
|
plat->emul = child;
|
||
|
|
else
|
||
|
|
return -ENODEV;
|
||
|
|
}
|
||
|
|
*devp = plat->emul;
|
||
|
|
*opsp = i2c_get_ops(plat->emul);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void sandbox_i2c_set_test_mode(struct udevice *bus, bool test_mode)
|
||
|
|
{
|
||
|
|
struct sandbox_i2c_priv *priv = dev_get_priv(bus);
|
||
|
|
|
||
|
|
priv->test_mode = test_mode;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sandbox_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
|
||
|
|
int nmsgs)
|
||
|
|
{
|
||
|
|
struct dm_i2c_bus *i2c = dev_get_uclass_priv(bus);
|
||
|
|
struct sandbox_i2c_priv *priv = dev_get_priv(bus);
|
||
|
|
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 (priv->test_mode && msg->addr == SANDBOX_I2C_TEST_ADDR)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
ret = i2c_get_chip(bus, msg->addr, 1, &dev);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = get_emul(dev, &emul, &ops);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (priv->test_mode) {
|
||
|
|
/*
|
||
|
|
* 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)) {
|
||
|
|
debug("%s: Max speed exceeded\n", __func__);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return ops->xfer(emul, msg, nmsgs);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct dm_i2c_ops sandbox_i2c_ops = {
|
||
|
|
.xfer = sandbox_i2c_xfer,
|
||
|
|
};
|
||
|
|
|
||
|
|
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,
|
||
|
|
.ops = &sandbox_i2c_ops,
|
||
|
|
.priv_auto_alloc_size = sizeof(struct sandbox_i2c_priv),
|
||
|
|
};
|