1 /* 2 * Copyright (c) 2015 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <dm.h> 10 #include <i2c.h> 11 #include <asm/io.h> 12 #include <asm/arch/pch.h> 13 14 int intel_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) 15 { 16 return -ENOSYS; 17 } 18 19 int intel_i2c_probe_chip(struct udevice *bus, uint chip_addr, uint chip_flags) 20 { 21 return -ENOSYS; 22 } 23 24 int intel_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) 25 { 26 return 0; 27 } 28 29 static int intel_i2c_probe(struct udevice *dev) 30 { 31 /* 32 * So far this is just setup code for ivybridge SMbus. When we have 33 * a full I2C driver this may need to be moved, generalised or made 34 * dependant on a particular compatible string. 35 * 36 * Set SMBus I/O base 37 */ 38 dm_pci_write_config32(dev, SMB_BASE, 39 SMBUS_IO_BASE | PCI_BASE_ADDRESS_SPACE_IO); 40 41 /* Set SMBus enable. */ 42 dm_pci_write_config8(dev, HOSTC, HST_EN); 43 44 /* Set SMBus I/O space enable. */ 45 dm_pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_IO); 46 47 /* Disable interrupt generation. */ 48 outb(0, SMBUS_IO_BASE + SMBHSTCTL); 49 50 /* Clear any lingering errors, so transactions can run. */ 51 outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT); 52 debug("SMBus controller enabled\n"); 53 54 return 0; 55 } 56 57 static const struct dm_i2c_ops intel_i2c_ops = { 58 .xfer = intel_i2c_xfer, 59 .probe_chip = intel_i2c_probe_chip, 60 .set_bus_speed = intel_i2c_set_bus_speed, 61 }; 62 63 static const struct udevice_id intel_i2c_ids[] = { 64 { .compatible = "intel,ich-i2c" }, 65 { } 66 }; 67 68 U_BOOT_DRIVER(intel_i2c) = { 69 .name = "i2c_intel", 70 .id = UCLASS_I2C, 71 .of_match = intel_i2c_ids, 72 .ops = &intel_i2c_ops, 73 .probe = intel_i2c_probe, 74 }; 75