src/southbridge/intel/i82801gx/smbus.c

/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */

#include <device/device.h>
#include <device/path.h>
#include <device/smbus.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/smbus_host.h>
#include "i82801gx.h"

static int lsmbus_read_byte(struct device *dev, u8 address)
{
	u16 device;
	struct resource *res;
	struct bus *pbus;

	device = dev->path.i2c.device;
	pbus = get_pbus_smbus(dev);
	res = find_resource(pbus->dev, 0x20);

	return do_smbus_read_byte(res->base, device, address);
}

static int lsmbus_write_byte(struct device *dev, u8 address, u8 data)
{
	u16 device;
	struct resource *res;
	struct bus *pbus;

	device = dev->path.i2c.device;
	pbus = get_pbus_smbus(dev);
	res = find_resource(pbus->dev, 0x20);
	return do_smbus_write_byte(res->base, device, address, data);
}

static int lsmbus_block_write(struct device *dev, u8 cmd, u8 bytes,
			      const u8 *buf)
{
	u16 device;
	struct resource *res;
	struct bus *pbus;

	device = dev->path.i2c.device;
	pbus = get_pbus_smbus(dev);
	res = find_resource(pbus->dev, 0x20);
	return do_smbus_block_write(res->base, device, cmd, bytes, buf);
}

static int lsmbus_block_read(struct device *dev, u8 cmd, u8 bytes, u8 *buf)
{
	u16 device;
	struct resource *res;
	struct bus *pbus;

	device = dev->path.i2c.device;
	pbus = get_pbus_smbus(dev);
	res = find_resource(pbus->dev, 0x20);
	return do_smbus_block_read(res->base, device, cmd, bytes, buf);
}


static struct smbus_bus_operations lops_smbus_bus = {
	.read_byte	= lsmbus_read_byte,
	.write_byte     = lsmbus_write_byte,
	.block_read     = lsmbus_block_read,
	.block_write    = lsmbus_block_write,
};

static struct pci_operations smbus_pci_ops = {
	.set_subsystem    = pci_dev_set_subsystem,
};

static void smbus_read_resources(struct device *dev)
{
	struct resource *res = new_resource(dev, PCI_BASE_ADDRESS_4);
	res->base = SMBUS_IO_BASE;
	res->size = 32;
	res->limit = res->base + res->size - 1;
	res->flags = IORESOURCE_IO | IORESOURCE_FIXED | IORESOURCE_RESERVE |
		     IORESOURCE_STORED | IORESOURCE_ASSIGNED;
}

static struct device_operations smbus_ops = {
	.read_resources		= smbus_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= pci_dev_enable_resources,
	.scan_bus		= scan_smbus,
	.enable			= i82801gx_enable,
	.ops_smbus_bus		= &lops_smbus_bus,
	.ops_pci		= &smbus_pci_ops,
};

/* 82801GB/GR/GDH/GBM/GHM/GU (ICH7/ICH7R/ICH7DH/ICH7-M/ICH7-M DH/ICH7-U) */
static const struct pci_driver i82801gx_smbus __pci_driver = {
	.ops	= &smbus_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x27da,
};