summaryrefslogtreecommitdiff
path: root/drivers/char/ipmi/ipmi_si_pci.c
blob: f54ca6869ed2c3f62d3c2d31daea3c5044642b9f (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * ipmi_si_pci.c
 *
 * Handling for IPMI devices on the PCI bus.
 */
#include <linux/module.h>
#include <linux/pci.h>
#include "ipmi_si.h"

#define PFX "ipmi_pci: "

static bool pci_registered;

static bool si_trypci = true;

module_param_named(trypci, si_trypci, bool, 0);
MODULE_PARM_DESC(trypci, "Setting this to zero will disable the"
		 " default scan of the interfaces identified via pci");

#define PCI_CLASS_SERIAL_IPMI		0x0c07
#define PCI_CLASS_SERIAL_IPMI_SMIC	0x0c0700
#define PCI_CLASS_SERIAL_IPMI_KCS	0x0c0701
#define PCI_CLASS_SERIAL_IPMI_BT	0x0c0702

#define PCI_DEVICE_ID_HP_MMC 0x121A

static void ipmi_pci_cleanup(struct si_sm_io *io)
{
	struct pci_dev *pdev = io->addr_source_data;

	pci_disable_device(pdev);
}

static int ipmi_pci_probe_regspacing(struct si_sm_io *io)
{
	if (io->si_type == SI_KCS) {
		unsigned char	status;
		int		regspacing;

		io->regsize = DEFAULT_REGSIZE;
		io->regshift = 0;

		/* detect 1, 4, 16byte spacing */
		for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) {
			io->regspacing = regspacing;
			if (io->io_setup(io)) {
				dev_err(io->dev,
					"Could not setup I/O space\n");
				return DEFAULT_REGSPACING;
			}
			/* write invalid cmd */
			io->outputb(io, 1, 0x10);
			/* read status back */
			status = io->inputb(io, 1);
			io->io_cleanup(io);
			if (status)
				return regspacing;
			regspacing *= 4;
		}
	}
	return DEFAULT_REGSPACING;
}

static struct pci_device_id ipmi_pci_blacklist[] = {
	/*
	 * This is a "Virtual IPMI device", whatever that is.  It appears
	 * as a KCS device by the class, but it is not one.
	 */
	{ PCI_VDEVICE(REALTEK, 0x816c) },
	{ 0, }
};

static int ipmi_pci_probe(struct pci_dev *pdev,
				    const struct pci_device_id *ent)
{
	int rv;
	struct si_sm_io io;

	if (pci_match_id(ipmi_pci_blacklist, pdev))
		return -ENODEV;

	memset(&io, 0, sizeof(io));
	io.addr_source = SI_PCI;
	dev_info(&pdev->dev, "probing via PCI");

	switch (pdev->class) {
	case PCI_CLASS_SERIAL_IPMI_SMIC:
		io.si_type = SI_SMIC;
		break;

	case PCI_CLASS_SERIAL_IPMI_KCS:
		io.si_type = SI_KCS;
		break;

	case PCI_CLASS_SERIAL_IPMI_BT:
		io.si_type = SI_BT;
		break;

	default:
		dev_info(&pdev->dev, "Unknown IPMI class: %x\n", pdev->class);
		return -ENOMEM;
	}

	rv = pci_enable_device(pdev);
	if (rv) {
		dev_err(&pdev->dev, "couldn't enable PCI device\n");
		return rv;
	}

	io.addr_source_cleanup = ipmi_pci_cleanup;
	io.addr_source_data = pdev;

	if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {
		io.addr_type = IPMI_IO_ADDR_SPACE;
		io.io_setup = ipmi_si_port_setup;
	} else {
		io.addr_type = IPMI_MEM_ADDR_SPACE;
		io.io_setup = ipmi_si_mem_setup;
	}
	io.addr_data = pci_resource_start(pdev, 0);

	io.regspacing = ipmi_pci_probe_regspacing(&io);
	io.regsize = DEFAULT_REGSIZE;
	io.regshift = 0;

	io.irq = pdev->irq;
	if (io.irq)
		io.irq_setup = ipmi_std_irq_setup;

	io.dev = &pdev->dev;

	dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n",
		&pdev->resource[0], io.regsize, io.regspacing, io.irq);

	rv = ipmi_si_add_smi(&io);
	if (rv)
		pci_disable_device(pdev);

	return rv;
}

static void ipmi_pci_remove(struct pci_dev *pdev)
{
	ipmi_si_remove_by_dev(&pdev->dev);
}

static const struct pci_device_id ipmi_pci_devices[] = {
	{ PCI_VDEVICE(HP, PCI_DEVICE_ID_HP_MMC) },
	{ PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_SMIC, ~0) },
	{ PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_KCS, ~0) },
	{ PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_BT, ~0) },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, ipmi_pci_devices);

static struct pci_driver ipmi_pci_driver = {
	.name =         DEVICE_NAME,
	.id_table =     ipmi_pci_devices,
	.probe =        ipmi_pci_probe,
	.remove =       ipmi_pci_remove,
};

void ipmi_si_pci_init(void)
{
	if (si_trypci) {
		int rv = pci_register_driver(&ipmi_pci_driver);
		if (rv)
			pr_err(PFX "Unable to register PCI driver: %d\n", rv);
		else
			pci_registered = true;
	}
}

void ipmi_si_pci_shutdown(void)
{
	if (pci_registered)
		pci_unregister_driver(&ipmi_pci_driver);
}