summaryrefslogtreecommitdiffstats
path: root/amd_imc.c
blob: 8b0bcf2f5af2b7f6a0b6794714ed9c53cb818bb7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2013 Rudolf Marek <r.marek@assembler.cz>
 * Copyright (C) 2013 Stefan Tauner
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 */

#if defined(__i386__) || defined(__x86_64__)

#include "flash.h"
#include "programmer.h"
#include "hwaccess.h"
#include "spi.h"

/* same as serverengines */
static void enter_conf_mode_ec(uint16_t port)
{
	OUTB(0x5a, port);
}

static void exit_conf_mode_ec(uint16_t port)
{
	OUTB(0xa5, port);
}

static uint16_t get_sio_port(struct pci_dev *dev)
{
	uint16_t ec_port;

	if (!dev) {
		return 0;
	}

	ec_port = pci_read_word(dev, 0xa4);

	/* EcPortActive? */
	if (!(ec_port & 0x1))
		return 0;

	ec_port &= ~0x1;

	return ec_port;
}

/* Wait for up to 10 ms for a response. */
static int mbox_wait_ack(uint16_t mbox_port)
{
	int i = 10;
	while (sio_read(mbox_port, 0x82) != 0xfa) {
		if (--i == 0) {
			msg_pwarn("IMC MBOX: Timeout!\n");
			return 1;
		}
		programmer_delay(1000);
	}
	return 0;
}

static uint16_t mbox_get_port(uint16_t sio_port)
{
	uint16_t mbox_port;

	enter_conf_mode_ec(sio_port);

	/* Go to LDN 9, mailbox */
	sio_write(sio_port, 7, 9);

	/* MBOX inactive? */
	if ((sio_read(sio_port, 0x30) & 1) == 0) {
		exit_conf_mode_ec(sio_port);
		return 0;
	}

	mbox_port = sio_read(sio_port, 0x60) << 8;
	mbox_port |= sio_read(sio_port, 0x61);

	exit_conf_mode_ec(sio_port);
	return mbox_port;
}

/* Returns negative values when IMC is inactive, positive values on errors */
static int imc_send_cmd(struct pci_dev *dev, uint8_t cmd)
{
	uint16_t sio_port;
	uint16_t mbox_port;

	/* IntegratedEcPresent? */
	if (!(pci_read_byte(dev, 0x40) & (1 << 7)))
		return -1;

	sio_port = get_sio_port(dev);
	if (!sio_port)
		return -1;

	msg_pdbg2("IMC SIO is at 0x%x.\n", sio_port);
	mbox_port = mbox_get_port(sio_port);
	if (!mbox_port)
		return -1;
	msg_pdbg2("IMC MBOX is at 0x%x.\n", mbox_port);

	sio_write(mbox_port, 0x82, 0x0);
	sio_write(mbox_port, 0x83, cmd);
	sio_write(mbox_port, 0x84, 0x0);
	/* trigger transfer 0x96 with subcommand cmd */
	sio_write(mbox_port, 0x80, 0x96);

	return mbox_wait_ack(mbox_port);
}

static int imc_resume(void *data)
{
	struct pci_dev *dev = data;
	int ret = imc_send_cmd(dev, 0xb5);

	if (ret != 0)
		msg_pinfo("Resuming IMC failed)\n");
	else
		msg_pdbg2("IMC resumed.\n");
	return ret;
}

int amd_imc_shutdown(struct pci_dev *dev)
{
	/* Try to put IMC to sleep */
	int ret = imc_send_cmd(dev, 0xb4);

	/* No IMC activity detectable, assume we are fine */
	if (ret < 0) {
		msg_pdbg2("No IMC found.\n");
		return 0;
	}

	if (ret != 0) {
		msg_perr("Shutting down IMC failed.\n");
		return ret;
	}
	msg_pdbg2("Shutting down IMC successful.\n");

	if (register_shutdown(imc_resume, dev))
		return 1;

	return ret;
}

#endif