summaryrefslogtreecommitdiff
path: root/src/drivers/generic/bayhub/bh720.c
blob: 3a0a9721ad85bc61a9a60bd0354590b1b7fdbbef (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
/*
 * Driver for BayHub Technology BH720 PCI to eMMC 5.0 HS200 bridge
 *
 * This file is part of the coreboot project.
 *
 * Copyright 2018 Google 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.
 */

#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include "chip.h"

enum {
	BH720_PROTECT			= 0xd0,
	BH720_PROTECT_OFF		= 0,
	BH720_PROTECT_ON		= 1,

	BH720_RTD3_L1			= 0x3e0,
	BH720_RTD3_L1_DISABLE_L1	= BIT(28),

	BH720_LINK_CTRL			= 0x90,
	BH720_LINK_CTRL_L0_ENABLE	= BIT(0),
	BH720_LINK_CTRL_L1_ENABLE	= BIT(1),
	BH720_LINK_CTRL_CLKREQ		= BIT(8),
};

static void bh720_init(struct device *dev)
{
	struct drivers_generic_bayhub_config *config = dev->chip_info;

	pci_dev_init(dev);

	if (config && config->power_saving) {
		/*
		 * This procedure for enabling power-saving mode is from the
		 * BayHub BIOS Implementation Guideline document.
		 */
		pci_write_config32(dev, BH720_PROTECT, BH720_PROTECT_OFF);
		pci_or_config32(dev, BH720_RTD3_L1, BH720_RTD3_L1_DISABLE_L1);
		pci_or_config32(dev, BH720_LINK_CTRL,
				BH720_LINK_CTRL_L0_ENABLE |
				BH720_LINK_CTRL_L1_ENABLE);
		pci_or_config32(dev, BH720_LINK_CTRL, BH720_LINK_CTRL_CLKREQ);
		pci_write_config32(dev, BH720_PROTECT, BH720_PROTECT_ON);
		printk(BIOS_INFO, "BayHub BH720: Power-saving enabled (link_ctrl=%#x)\n",
		       pci_read_config32(dev, BH720_LINK_CTRL));
	}
}

static struct pci_operations pci_ops = {
	.set_subsystem = pci_dev_set_subsystem,
};

static struct device_operations bh720_ops = {
	.read_resources		= pci_dev_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= pci_dev_enable_resources,
	.ops_pci		= &pci_ops,
	.init			= bh720_init,
};

static const unsigned short pci_device_ids[] = {
	PCI_DEVICE_ID_O2_BH720,
	0
};

static const struct pci_driver bayhub_bh720 __pci_driver = {
	.ops		= &bh720_ops,
	.vendor		= PCI_VENDOR_ID_O2,
	.devices	= pci_device_ids,
};

static void bh720_enable(struct device *dev)
{
	dev->ops = &bh720_ops;
}

struct chip_operations bayhub_bh720_ops = {
	CHIP_NAME("BayHub Technology BH720 PCI to eMMC 5.0 HS200 bridge")
	.enable_dev = bh720_enable,
};