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dm: i2c: Add a sandbox I2C driver

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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>
This commit is contained in:
Simon Glass 2014-12-10 08:55:50 -07:00
parent c70c71d833
commit d19de0d314
2 changed files with 112 additions and 1 deletions
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2
drivers/i2c/Makefile
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@ -27,7 +27,7 @@ obj-$(CONFIG_SYS_I2C_OMAP34XX) += omap24xx_i2c.o
obj-$(CONFIG_SYS_I2C_PPC4XX) += ppc4xx_i2c.o
obj-$(CONFIG_SYS_I2C_RCAR) += rcar_i2c.o
obj-$(CONFIG_SYS_I2C_S3C24X0) += s3c24x0_i2c.o
obj-$(CONFIG_SYS_I2C_SANDBOX) += i2c-emul-uclass.o
obj-$(CONFIG_SYS_I2C_SANDBOX) += sandbox_i2c.o i2c-emul-uclass.o
obj-$(CONFIG_SYS_I2C_SH) += sh_i2c.o
obj-$(CONFIG_SYS_I2C_SOFT) += soft_i2c.o
obj-$(CONFIG_SYS_I2C_TEGRA) += tegra_i2c.o

111
drivers/i2c/sandbox_i2c.c Normal file
View file

@ -0,0 +1,111 @@
/*
* 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,
};