| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2016 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/acpi_device.h> |
| #include <arch/acpigen.h> |
| #include <device/device.h> |
| #include <device/i2c.h> |
| #include <device/pci.h> |
| #include <device/pci_def.h> |
| #include <device/pci_ids.h> |
| #include <soc/i2c.h> |
| #include <soc/intel/common/lpss_i2c.h> |
| #include <soc/pci_devs.h> |
| #include <soc/pci_ids.h> |
| #include "chip.h" |
| |
| uintptr_t lpss_i2c_base_address(unsigned bus) |
| { |
| unsigned devfn; |
| struct device *dev; |
| struct resource *res; |
| |
| /* bus -> devfn */ |
| devfn = i2c_bus_to_devfn(bus); |
| if (devfn >= 0) { |
| /* devfn -> dev */ |
| dev = dev_find_slot(0, devfn); |
| if (dev) { |
| /* dev -> bar0 */ |
| res = find_resource(dev, PCI_BASE_ADDRESS_0); |
| if (res) |
| return res->base; |
| } |
| } |
| |
| return (uintptr_t)NULL; |
| } |
| |
| static int i2c_dev_to_bus(struct device *dev) |
| { |
| return i2c_devfn_to_bus(dev->path.pci.devfn); |
| } |
| |
| /* |
| * The device should already be enabled and out of reset, |
| * either from early init in coreboot or FSP-S. |
| */ |
| static void i2c_dev_init(struct device *dev) |
| { |
| struct soc_intel_apollolake_config *config = dev->chip_info; |
| const struct lpss_i2c_speed_config *sptr; |
| enum i2c_speed speed; |
| int i, bus = i2c_dev_to_bus(dev); |
| |
| if (!config || bus < 0) |
| return; |
| |
| speed = config->i2c[bus].speed ? : I2C_SPEED_FAST; |
| lpss_i2c_init(bus, speed); |
| |
| /* Apply custom speed config if it has been set by the board */ |
| for (i = 0; i < LPSS_I2C_SPEED_CONFIG_COUNT; i++) { |
| sptr = &config->i2c[bus].speed_config[i]; |
| if (sptr->speed == speed) { |
| lpss_i2c_set_speed_config(bus, sptr); |
| break; |
| } |
| } |
| } |
| |
| static void i2c_fill_ssdt(struct device *dev) |
| { |
| struct soc_intel_apollolake_config *config = dev->chip_info; |
| int bus = i2c_dev_to_bus(dev); |
| |
| if (!config || bus < 0) |
| return; |
| |
| acpigen_write_scope(acpi_device_path(dev)); |
| lpss_i2c_acpi_fill_ssdt(config->i2c[bus].speed_config); |
| acpigen_pop_len(); |
| } |
| |
| static struct i2c_bus_operations i2c_bus_ops = { |
| .dev_to_bus = &i2c_dev_to_bus, |
| }; |
| |
| static struct device_operations i2c_dev_ops = { |
| .read_resources = &pci_dev_read_resources, |
| .set_resources = &pci_dev_set_resources, |
| .enable_resources = &pci_dev_enable_resources, |
| .scan_bus = &scan_smbus, |
| .ops_i2c_bus = &i2c_bus_ops, |
| .init = &i2c_dev_init, |
| .acpi_fill_ssdt_generator = &i2c_fill_ssdt, |
| }; |
| |
| static const unsigned short pci_device_ids[] = { |
| PCI_DEVICE_ID_APOLLOLAKE_I2C0, |
| PCI_DEVICE_ID_APOLLOLAKE_I2C1, |
| PCI_DEVICE_ID_APOLLOLAKE_I2C2, |
| PCI_DEVICE_ID_APOLLOLAKE_I2C3, |
| PCI_DEVICE_ID_APOLLOLAKE_I2C4, |
| PCI_DEVICE_ID_APOLLOLAKE_I2C5, |
| PCI_DEVICE_ID_APOLLOLAKE_I2C6, |
| PCI_DEVICE_ID_APOLLOLAKE_I2C7, |
| 0, |
| }; |
| |
| static const struct pci_driver pch_i2c __pci_driver = { |
| .ops = &i2c_dev_ops, |
| .vendor = PCI_VENDOR_ID_INTEL, |
| .devices = pci_device_ids, |
| }; |