1 // SPDX-License-Identifier: GPL-2.0+
5 * Handling for IPMI devices on the PCI bus.
8 #define pr_fmt(fmt) "ipmi_pci: " fmt
10 #include <linux/module.h>
11 #include <linux/pci.h>
14 static bool pci_registered;
16 static bool si_trypci = true;
18 module_param_named(trypci, si_trypci, bool, 0);
19 MODULE_PARM_DESC(trypci,
20 "Setting this to zero will disable the default scan of the interfaces identified via pci");
22 #define PCI_DEVICE_ID_HP_MMC 0x121A
24 static int ipmi_pci_probe_regspacing(struct si_sm_io *io)
26 if (io->si_type == SI_KCS) {
30 io->regsize = DEFAULT_REGSIZE;
33 /* detect 1, 4, 16byte spacing */
34 for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) {
35 io->regspacing = regspacing;
36 if (io->io_setup(io)) {
37 dev_err(io->dev, "Could not setup I/O space\n");
38 return DEFAULT_REGSPACING;
40 /* write invalid cmd */
41 io->outputb(io, 1, 0x10);
42 /* read status back */
43 status = io->inputb(io, 1);
50 return DEFAULT_REGSPACING;
53 static struct pci_device_id ipmi_pci_blacklist[] = {
55 * This is a "Virtual IPMI device", whatever that is. It appears
56 * as a KCS device by the class, but it is not one.
58 { PCI_VDEVICE(REALTEK, 0x816c) },
62 static int ipmi_pci_probe(struct pci_dev *pdev,
63 const struct pci_device_id *ent)
68 if (pci_match_id(ipmi_pci_blacklist, pdev))
71 memset(&io, 0, sizeof(io));
72 io.addr_source = SI_PCI;
73 dev_info(&pdev->dev, "probing via PCI");
75 switch (pdev->class) {
76 case PCI_CLASS_SERIAL_IPMI_SMIC:
80 case PCI_CLASS_SERIAL_IPMI_KCS:
84 case PCI_CLASS_SERIAL_IPMI_BT:
89 dev_info(&pdev->dev, "Unknown IPMI class: %x\n", pdev->class);
93 rv = pcim_enable_device(pdev);
95 dev_err(&pdev->dev, "couldn't enable PCI device\n");
99 if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {
100 io.addr_space = IPMI_IO_ADDR_SPACE;
101 io.io_setup = ipmi_si_port_setup;
103 io.addr_space = IPMI_MEM_ADDR_SPACE;
104 io.io_setup = ipmi_si_mem_setup;
106 io.addr_data = pci_resource_start(pdev, 0);
110 io.regspacing = ipmi_pci_probe_regspacing(&io);
111 io.regsize = DEFAULT_REGSIZE;
116 io.irq_setup = ipmi_std_irq_setup;
118 dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n",
119 &pdev->resource[0], io.regsize, io.regspacing, io.irq);
121 return ipmi_si_add_smi(&io);
124 static void ipmi_pci_remove(struct pci_dev *pdev)
126 ipmi_si_remove_by_dev(&pdev->dev);
129 static const struct pci_device_id ipmi_pci_devices[] = {
130 { PCI_VDEVICE(HP, PCI_DEVICE_ID_HP_MMC) },
131 { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_SMIC, ~0) },
132 { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_KCS, ~0) },
133 { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_BT, ~0) },
136 MODULE_DEVICE_TABLE(pci, ipmi_pci_devices);
138 static struct pci_driver ipmi_pci_driver = {
139 .name = SI_DEVICE_NAME,
140 .id_table = ipmi_pci_devices,
141 .probe = ipmi_pci_probe,
142 .remove = ipmi_pci_remove,
145 void ipmi_si_pci_init(void)
148 int rv = pci_register_driver(&ipmi_pci_driver);
150 pr_err("Unable to register PCI driver: %d\n", rv);
152 pci_registered = true;
156 void ipmi_si_pci_shutdown(void)
159 pci_unregister_driver(&ipmi_pci_driver);