| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2009-2010 iWave Systems |
| * Copyright (C) 2013 Sage Electronic Engineering, LLC. |
| * |
| * 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. |
| */ |
| |
| #define __SIMPLE_DEVICE__ |
| |
| #include <stdint.h> |
| #include <arch/io.h> |
| #include <device/pci_def.h> |
| #include <device/pnp_def.h> |
| #include <cpu/x86/lapic.h> |
| #include "northbridge.h" |
| |
| /* |
| * Restricted Access Regions: |
| * |
| * MCR - Message Control Register |
| * 31 24 16 8 4 0 |
| * ---------------------------------------------------------------------------- |
| * | | | Target | Write | | |
| * | Opcode | Port | register | byte | Reserved | |
| * | | | Address | Enables | | |
| * ---------------------------------------------------------------------------- |
| * |
| * MDR - Message Data Register |
| * 31 0 |
| * ---------------------------------------------------------------------------- |
| * | | |
| * | Data | |
| * | | |
| * ---------------------------------------------------------------------------- |
| */ |
| |
| #define MSG_OPCODE_READ (0x10 << 24) |
| #define MSG_OPCODE_WRITE (0x11 << 24) |
| |
| #define MCR 0xD0 |
| #define MDR 0xD4 |
| #define MCRE 0xD8 |
| |
| u32 sideband_read(int port, int reg) |
| { |
| pci_write_config32(PCI_DEV(0, 0, 0), MCR, |
| (MSG_OPCODE_READ | (port << 16) | (reg << 8))); |
| return pci_read_config32(PCI_DEV(0, 0, 0), MDR); |
| } |
| |
| void sideband_write(int port, int reg, long data) |
| { |
| pci_write_config32(PCI_DEV(0, 0, 0), MDR, data); |
| pci_write_config32(PCI_DEV(0, 0, 0), MCR, |
| (MSG_OPCODE_WRITE | (port << 16) | (reg << 8) | (0xF << 4))); |
| pci_read_config32(PCI_DEV(0, 0, 0), MDR); |
| } |