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243ac210 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
13d0b35c CM |
2 | /* |
3 | * ipmi_si_pci.c | |
4 | * | |
5 | * Handling for IPMI devices on the PCI bus. | |
6 | */ | |
25880f7d JP |
7 | |
8 | #define pr_fmt(fmt) "ipmi_pci: " fmt | |
9 | ||
13d0b35c CM |
10 | #include <linux/module.h> |
11 | #include <linux/pci.h> | |
12 | #include "ipmi_si.h" | |
13 | ||
13d0b35c CM |
14 | static bool pci_registered; |
15 | ||
16 | static bool si_trypci = true; | |
17 | ||
18 | module_param_named(trypci, si_trypci, bool, 0); | |
19 | MODULE_PARM_DESC(trypci, "Setting this to zero will disable the" | |
20 | " default scan of the interfaces identified via pci"); | |
21 | ||
ad2575f8 | 22 | #define PCI_DEVICE_ID_HP_MMC 0x121A |
13d0b35c CM |
23 | |
24 | static void ipmi_pci_cleanup(struct si_sm_io *io) | |
25 | { | |
26 | struct pci_dev *pdev = io->addr_source_data; | |
27 | ||
28 | pci_disable_device(pdev); | |
29 | } | |
30 | ||
31 | static int ipmi_pci_probe_regspacing(struct si_sm_io *io) | |
32 | { | |
33 | if (io->si_type == SI_KCS) { | |
34 | unsigned char status; | |
35 | int regspacing; | |
36 | ||
37 | io->regsize = DEFAULT_REGSIZE; | |
38 | io->regshift = 0; | |
39 | ||
40 | /* detect 1, 4, 16byte spacing */ | |
41 | for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) { | |
42 | io->regspacing = regspacing; | |
43 | if (io->io_setup(io)) { | |
25880f7d | 44 | dev_err(io->dev, "Could not setup I/O space\n"); |
13d0b35c CM |
45 | return DEFAULT_REGSPACING; |
46 | } | |
47 | /* write invalid cmd */ | |
48 | io->outputb(io, 1, 0x10); | |
49 | /* read status back */ | |
50 | status = io->inputb(io, 1); | |
51 | io->io_cleanup(io); | |
52 | if (status) | |
53 | return regspacing; | |
54 | regspacing *= 4; | |
55 | } | |
56 | } | |
57 | return DEFAULT_REGSPACING; | |
58 | } | |
59 | ||
bc48fa1b CM |
60 | static struct pci_device_id ipmi_pci_blacklist[] = { |
61 | /* | |
62 | * This is a "Virtual IPMI device", whatever that is. It appears | |
63 | * as a KCS device by the class, but it is not one. | |
64 | */ | |
65 | { PCI_VDEVICE(REALTEK, 0x816c) }, | |
66 | { 0, } | |
67 | }; | |
68 | ||
13d0b35c CM |
69 | static int ipmi_pci_probe(struct pci_dev *pdev, |
70 | const struct pci_device_id *ent) | |
71 | { | |
72 | int rv; | |
13d0b35c CM |
73 | struct si_sm_io io; |
74 | ||
bc48fa1b CM |
75 | if (pci_match_id(ipmi_pci_blacklist, pdev)) |
76 | return -ENODEV; | |
77 | ||
13d0b35c CM |
78 | memset(&io, 0, sizeof(io)); |
79 | io.addr_source = SI_PCI; | |
80 | dev_info(&pdev->dev, "probing via PCI"); | |
81 | ||
ad2575f8 CM |
82 | switch (pdev->class) { |
83 | case PCI_CLASS_SERIAL_IPMI_SMIC: | |
13d0b35c CM |
84 | io.si_type = SI_SMIC; |
85 | break; | |
86 | ||
ad2575f8 | 87 | case PCI_CLASS_SERIAL_IPMI_KCS: |
13d0b35c CM |
88 | io.si_type = SI_KCS; |
89 | break; | |
90 | ||
ad2575f8 | 91 | case PCI_CLASS_SERIAL_IPMI_BT: |
13d0b35c CM |
92 | io.si_type = SI_BT; |
93 | break; | |
94 | ||
95 | default: | |
ad2575f8 | 96 | dev_info(&pdev->dev, "Unknown IPMI class: %x\n", pdev->class); |
13d0b35c CM |
97 | return -ENOMEM; |
98 | } | |
99 | ||
100 | rv = pci_enable_device(pdev); | |
101 | if (rv) { | |
102 | dev_err(&pdev->dev, "couldn't enable PCI device\n"); | |
103 | return rv; | |
104 | } | |
105 | ||
106 | io.addr_source_cleanup = ipmi_pci_cleanup; | |
107 | io.addr_source_data = pdev; | |
108 | ||
1ac8aa8d | 109 | if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) { |
f6296bdc | 110 | io.addr_space = IPMI_IO_ADDR_SPACE; |
1ac8aa8d CM |
111 | io.io_setup = ipmi_si_port_setup; |
112 | } else { | |
f6296bdc | 113 | io.addr_space = IPMI_MEM_ADDR_SPACE; |
1ac8aa8d CM |
114 | io.io_setup = ipmi_si_mem_setup; |
115 | } | |
13d0b35c CM |
116 | io.addr_data = pci_resource_start(pdev, 0); |
117 | ||
01508d9e MR |
118 | io.dev = &pdev->dev; |
119 | ||
13d0b35c CM |
120 | io.regspacing = ipmi_pci_probe_regspacing(&io); |
121 | io.regsize = DEFAULT_REGSIZE; | |
122 | io.regshift = 0; | |
123 | ||
124 | io.irq = pdev->irq; | |
125 | if (io.irq) | |
126 | io.irq_setup = ipmi_std_irq_setup; | |
127 | ||
13d0b35c | 128 | dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n", |
25880f7d | 129 | &pdev->resource[0], io.regsize, io.regspacing, io.irq); |
13d0b35c CM |
130 | |
131 | rv = ipmi_si_add_smi(&io); | |
132 | if (rv) | |
133 | pci_disable_device(pdev); | |
134 | ||
135 | return rv; | |
136 | } | |
137 | ||
138 | static void ipmi_pci_remove(struct pci_dev *pdev) | |
139 | { | |
140 | ipmi_si_remove_by_dev(&pdev->dev); | |
141 | } | |
142 | ||
143 | static const struct pci_device_id ipmi_pci_devices[] = { | |
ad2575f8 CM |
144 | { PCI_VDEVICE(HP, PCI_DEVICE_ID_HP_MMC) }, |
145 | { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_SMIC, ~0) }, | |
146 | { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_KCS, ~0) }, | |
147 | { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_BT, ~0) }, | |
13d0b35c CM |
148 | { 0, } |
149 | }; | |
150 | MODULE_DEVICE_TABLE(pci, ipmi_pci_devices); | |
151 | ||
152 | static struct pci_driver ipmi_pci_driver = { | |
153 | .name = DEVICE_NAME, | |
154 | .id_table = ipmi_pci_devices, | |
155 | .probe = ipmi_pci_probe, | |
156 | .remove = ipmi_pci_remove, | |
157 | }; | |
158 | ||
159 | void ipmi_si_pci_init(void) | |
160 | { | |
161 | if (si_trypci) { | |
162 | int rv = pci_register_driver(&ipmi_pci_driver); | |
163 | if (rv) | |
25880f7d | 164 | pr_err("Unable to register PCI driver: %d\n", rv); |
13d0b35c CM |
165 | else |
166 | pci_registered = true; | |
167 | } | |
168 | } | |
169 | ||
170 | void ipmi_si_pci_shutdown(void) | |
171 | { | |
172 | if (pci_registered) | |
173 | pci_unregister_driver(&ipmi_pci_driver); | |
174 | } |