/* * This file is part of the coreboot project. * * Copyright (C) 2008-2009 coresystems GmbH * Copyright (C) 2014 Google Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <arch/io.h> #include <device/device.h> #include <device/path.h> #include <device/smbus.h> #include <device/smbus_def.h> #include <device/pci.h> #include <device/pci_ids.h> #include <device/pci_ops.h> #include <soc/iomap.h> #include <soc/ramstage.h> #include <soc/smbus.h> static void pch_smbus_init(struct device *dev) { struct resource *res; u16 reg16; /* Enable clock gating */ reg16 = pci_read_config32(dev, 0x80); reg16 &= ~((1 << 8)|(1 << 10)|(1 << 12)|(1 << 14)); pci_write_config32(dev, 0x80, reg16); /* Set Receive Slave Address */ res = find_resource(dev, PCI_BASE_ADDRESS_4); if (res) outb(SMBUS_SLAVE_ADDR, res->base + SMB_RCV_SLVA); } 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, PCI_BASE_ADDRESS_4); 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, PCI_BASE_ADDRESS_4); return do_smbus_write_byte(res->base, device, address, data); } static struct smbus_bus_operations lops_smbus_bus = { .read_byte = lsmbus_read_byte, .write_byte = lsmbus_write_byte, }; static void smbus_read_resources(struct device *dev) { struct resource *res = new_resource(dev, PCI_BASE_ADDRESS_4); res->base = SMBUS_BASE_ADDRESS; res->size = 32; res->limit = res->base + res->size - 1; res->flags = IORESOURCE_IO | IORESOURCE_FIXED | IORESOURCE_RESERVE | IORESOURCE_STORED | IORESOURCE_ASSIGNED; /* Also add MMIO resource */ res = pci_get_resource(dev, PCI_BASE_ADDRESS_0); } 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, .init = pch_smbus_init, .ops_smbus_bus = &lops_smbus_bus, .ops_pci = &broadwell_pci_ops, }; static const unsigned short pci_device_ids[] = { 0x9c22, /* LynxPoint */ 0x9ca2, /* WildcatPoint */ 0 }; static const struct pci_driver pch_smbus __pci_driver = { .ops = &smbus_ops, .vendor = PCI_VENDOR_ID_INTEL, .devices = pci_device_ids, };