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70e145989b
Detect and temporarily disable the IMC while accessing the flash. Disable writes on default, but allow the user to enforce it. Corresponding to flashrom svn r1704. Signed-off-by: Rudolf Marek <r.marek@assembler.cz> Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at> Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at> Acked-by: David Hendricks <dhendrix@google.com>
160 lines
3.4 KiB
C
160 lines
3.4 KiB
C
/*
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* This file is part of the flashrom project.
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*
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* Copyright (C) 2013 Rudolf Marek <r.marek@assembler.cz>
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* Copyright (C) 2013 Stefan Tauner
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if defined(__i386__) || defined(__x86_64__)
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#include "flash.h"
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#include "programmer.h"
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#include "hwaccess.h"
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#include "spi.h"
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/* same as serverengines */
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static void enter_conf_mode_ec(uint16_t port)
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{
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OUTB(0x5a, port);
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}
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static void exit_conf_mode_ec(uint16_t port)
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{
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OUTB(0xa5, port);
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}
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static uint16_t get_sio_port(struct pci_dev *dev)
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{
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uint16_t ec_port;
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if (!dev) {
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return 0;
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}
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ec_port = pci_read_word(dev, 0xa4);
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/* EcPortActive? */
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if (!(ec_port & 0x1))
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return 0;
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ec_port &= ~0x1;
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return ec_port;
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}
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/* Wait for up to 10 ms for a response. */
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static int mbox_wait_ack(uint16_t mbox_port)
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{
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int i = 10;
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while (sio_read(mbox_port, 0x82) != 0xfa) {
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if (--i == 0) {
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msg_pwarn("IMC MBOX: Timeout!\n");
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return 1;
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}
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programmer_delay(1000);
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}
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return 0;
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}
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static uint16_t mbox_get_port(uint16_t sio_port)
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{
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uint16_t mbox_port;
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enter_conf_mode_ec(sio_port);
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/* Go to LDN 9, mailbox */
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sio_write(sio_port, 7, 9);
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/* MBOX inactive? */
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if ((sio_read(sio_port, 0x30) & 1) == 0) {
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exit_conf_mode_ec(sio_port);
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return 0;
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}
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mbox_port = sio_read(sio_port, 0x60) << 8;
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mbox_port |= sio_read(sio_port, 0x61);
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exit_conf_mode_ec(sio_port);
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return mbox_port;
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}
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/* Returns negative values when IMC is inactive, positive values on errors */
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static int imc_send_cmd(struct pci_dev *dev, uint8_t cmd)
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{
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uint16_t sio_port;
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uint16_t mbox_port;
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/* IntegratedEcPresent? */
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if (!(pci_read_byte(dev, 0x40) & (1 << 7)))
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return -1;
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sio_port = get_sio_port(dev);
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if (!sio_port)
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return -1;
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msg_pdbg2("IMC SIO is at 0x%x.\n", sio_port);
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mbox_port = mbox_get_port(sio_port);
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if (!mbox_port)
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return -1;
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msg_pdbg2("IMC MBOX is at 0x%x.\n", mbox_port);
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sio_write(mbox_port, 0x82, 0x0);
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sio_write(mbox_port, 0x83, cmd);
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sio_write(mbox_port, 0x84, 0x0);
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/* trigger transfer 0x96 with subcommand cmd */
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sio_write(mbox_port, 0x80, 0x96);
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return mbox_wait_ack(mbox_port);
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}
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static int imc_resume(void *data)
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{
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struct pci_dev *dev = data;
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int ret = imc_send_cmd(dev, 0xb5);
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if (ret != 0)
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msg_pinfo("Resuming IMC failed)\n");
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else
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msg_pdbg2("IMC resumed.\n");
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return ret;
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}
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int amd_imc_shutdown(struct pci_dev *dev)
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{
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/* Try to put IMC to sleep */
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int ret = imc_send_cmd(dev, 0xb4);
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/* No IMC activity detectable, assume we are fine */
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if (ret < 0) {
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msg_pdbg2("No IMC found.\n");
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return 0;
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}
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if (ret != 0) {
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msg_perr("Shutting down IMC failed.\n");
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return ret;
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}
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msg_pdbg2("Shutting down IMC successful.\n");
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if (register_shutdown(imc_resume, dev))
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return 1;
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return ret;
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}
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#endif
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