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/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <i2c.h>
#include <asm/io.h>
#include <asm/arch/pch.h>
int intel_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs)
{
return -ENOSYS;
}
int intel_i2c_probe_chip(struct udevice *bus, uint chip_addr, uint chip_flags)
{
return -ENOSYS;
}
int intel_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
{
return 0;
}
static int intel_i2c_probe(struct udevice *dev)
{
/*
* So far this is just setup code for ivybridge SMbus. When we have
* a full I2C driver this may need to be moved, generalised or made
* dependant on a particular compatible string.
*
* Set SMBus I/O base
*/
dm_pci_write_config32(dev, SMB_BASE,
SMBUS_IO_BASE | PCI_BASE_ADDRESS_SPACE_IO);
/* Set SMBus enable. */
dm_pci_write_config8(dev, HOSTC, HST_EN);
/* Set SMBus I/O space enable. */
dm_pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_IO);
/* Disable interrupt generation. */
outb(0, SMBUS_IO_BASE + SMBHSTCTL);
/* Clear any lingering errors, so transactions can run. */
outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
debug("SMBus controller enabled\n");
return 0;
}
static const struct dm_i2c_ops intel_i2c_ops = {
.xfer = intel_i2c_xfer,
.probe_chip = intel_i2c_probe_chip,
.set_bus_speed = intel_i2c_set_bus_speed,
};
static const struct udevice_id intel_i2c_ids[] = {
{ .compatible = "intel,ich-i2c" },
{ }
};
U_BOOT_DRIVER(intel_i2c) = {
.name = "i2c_intel",
.id = UCLASS_I2C,
.of_match = intel_i2c_ids,
.ops = &intel_i2c_ops,
.probe = intel_i2c_probe,
};
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