summaryrefslogtreecommitdiff
path: root/arch/i386/pci/mmconfig.c
blob: 0ee8a983708c078b0e3e8f9b7c27548cd1936845 (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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
/*
 * Copyright (C) 2004 Matthew Wilcox <matthew@wil.cx>
 * Copyright (C) 2004 Intel Corp.
 *
 * This code is released under the GNU General Public License version 2.
 */

/*
 * mmconfig.c - Low-level direct PCI config space access via MMCONFIG
 */

#include <linux/pci.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include "pci.h"

#define mmcfg_virt_addr ((void __iomem *) fix_to_virt(FIX_PCIE_MCFG))

/* The base address of the last MMCONFIG device accessed */
static u32 mmcfg_last_accessed_device;

static DECLARE_BITMAP(fallback_slots, 32);

/*
 * Functions for accessing PCI configuration space with MMCONFIG accesses
 */
static u32 get_base_addr(unsigned int seg, int bus, unsigned devfn)
{
	int cfg_num = -1;
	struct acpi_table_mcfg_config *cfg;

	if (seg == 0 && bus == 0 &&
	    test_bit(PCI_SLOT(devfn), fallback_slots))
		return 0;

	while (1) {
		++cfg_num;
		if (cfg_num >= pci_mmcfg_config_num) {
			break;
		}
		cfg = &pci_mmcfg_config[cfg_num];
		if (cfg->pci_segment_group_number != seg)
			continue;
		if ((cfg->start_bus_number <= bus) &&
		    (cfg->end_bus_number >= bus))
			return cfg->base_address;
	}

	/* Handle more broken MCFG tables on Asus etc.
	   They only contain a single entry for bus 0-0. Assume
 	   this applies to all busses. */
	cfg = &pci_mmcfg_config[0];
	if (pci_mmcfg_config_num == 1 &&
		cfg->pci_segment_group_number == 0 &&
		(cfg->start_bus_number | cfg->end_bus_number) == 0)
		return cfg->base_address;

	/* Fall back to type 0 */
	return 0;
}

static inline void pci_exp_set_dev_base(unsigned int base, int bus, int devfn)
{
	u32 dev_base = base | (bus << 20) | (devfn << 12);
	if (dev_base != mmcfg_last_accessed_device) {
		mmcfg_last_accessed_device = dev_base;
		set_fixmap_nocache(FIX_PCIE_MCFG, dev_base);
	}
}

static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
			  unsigned int devfn, int reg, int len, u32 *value)
{
	unsigned long flags;
	u32 base;

	if (!value || (bus > 255) || (devfn > 255) || (reg > 4095))
		return -EINVAL;

	base = get_base_addr(seg, bus, devfn);
	if (!base)
		return pci_conf1_read(seg,bus,devfn,reg,len,value);

	spin_lock_irqsave(&pci_config_lock, flags);

	pci_exp_set_dev_base(base, bus, devfn);

	switch (len) {
	case 1:
		*value = readb(mmcfg_virt_addr + reg);
		break;
	case 2:
		*value = readw(mmcfg_virt_addr + reg);
		break;
	case 4:
		*value = readl(mmcfg_virt_addr + reg);
		break;
	}

	spin_unlock_irqrestore(&pci_config_lock, flags);

	return 0;
}

static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
			   unsigned int devfn, int reg, int len, u32 value)
{
	unsigned long flags;
	u32 base;

	if ((bus > 255) || (devfn > 255) || (reg > 4095)) 
		return -EINVAL;

	base = get_base_addr(seg, bus, devfn);
	if (!base)
		return pci_conf1_write(seg,bus,devfn,reg,len,value);

	spin_lock_irqsave(&pci_config_lock, flags);

	pci_exp_set_dev_base(base, bus, devfn);

	switch (len) {
	case 1:
		writeb(value, mmcfg_virt_addr + reg);
		break;
	case 2:
		writew(value, mmcfg_virt_addr + reg);
		break;
	case 4:
		writel(value, mmcfg_virt_addr + reg);
		break;
	}

	spin_unlock_irqrestore(&pci_config_lock, flags);

	return 0;
}

static struct pci_raw_ops pci_mmcfg = {
	.read =		pci_mmcfg_read,
	.write =	pci_mmcfg_write,
};

/* K8 systems have some devices (typically in the builtin northbridge)
   that are only accessible using type1
   Normally this can be expressed in the MCFG by not listing them
   and assigning suitable _SEGs, but this isn't implemented in some BIOS.
   Instead try to discover all devices on bus 0 that are unreachable using MM
   and fallback for them.
   We only do this for bus 0/seg 0 */
static __init void unreachable_devices(void)
{
	int i;
	unsigned long flags;

	for (i = 0; i < 32; i++) {
		u32 val1;
		u32 addr;

		pci_conf1_read(0, 0, PCI_DEVFN(i, 0), 0, 4, &val1);
		if (val1 == 0xffffffff)
			continue;

		/* Locking probably not needed, but safer */
		spin_lock_irqsave(&pci_config_lock, flags);
		addr = get_base_addr(0, 0, PCI_DEVFN(i, 0));
		if (addr != 0)
			pci_exp_set_dev_base(addr, 0, PCI_DEVFN(i, 0));
		if (addr == 0 || readl((u32 __iomem *)mmcfg_virt_addr) != val1)
			set_bit(i, fallback_slots);
		spin_unlock_irqrestore(&pci_config_lock, flags);
	}
}

static int __init pci_mmcfg_init(void)
{
	if ((pci_probe & PCI_PROBE_MMCONF) == 0)
		goto out;

	acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
	if ((pci_mmcfg_config_num == 0) ||
	    (pci_mmcfg_config == NULL) ||
	    (pci_mmcfg_config[0].base_address == 0))
		goto out;

	printk(KERN_INFO "PCI: Using MMCONFIG\n");
	raw_pci_ops = &pci_mmcfg;
	pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;

	unreachable_devices();

 out:
	return 0;
}

arch_initcall(pci_mmcfg_init);