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1// SPDX-License-Identifier: GPL-2.0+2/*3 * ipmi_si_pci.c4 *5 * Handling for IPMI devices on the PCI bus.6 */7 8#define pr_fmt(fmt) "ipmi_pci: " fmt9 10#include <linux/module.h>11#include <linux/pci.h>12#include "ipmi_si.h"13 14static bool pci_registered;15 16static bool si_trypci = true;17 18module_param_named(trypci, si_trypci, bool, 0);19MODULE_PARM_DESC(trypci,20 "Setting this to zero will disable the default scan of the interfaces identified via pci");21 22#define PCI_DEVICE_ID_HP_MMC 0x121A23 24static int ipmi_pci_probe_regspacing(struct si_sm_io *io)25{26 if (io->si_type == SI_KCS) {27 unsigned char status;28 int regspacing;29 30 io->regsize = DEFAULT_REGSIZE;31 io->regshift = 0;32 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;39 }40 /* write invalid cmd */41 io->outputb(io, 1, 0x10);42 /* read status back */43 status = io->inputb(io, 1);44 io->io_cleanup(io);45 if (status)46 return regspacing;47 regspacing *= 4;48 }49 }50 return DEFAULT_REGSPACING;51}52 53static struct pci_device_id ipmi_pci_blacklist[] = {54 /*55 * This is a "Virtual IPMI device", whatever that is. It appears56 * as a KCS device by the class, but it is not one.57 */58 { PCI_VDEVICE(REALTEK, 0x816c) },59 { 0, }60};61 62static int ipmi_pci_probe(struct pci_dev *pdev,63 const struct pci_device_id *ent)64{65 int rv;66 struct si_sm_io io;67 68 if (pci_match_id(ipmi_pci_blacklist, pdev))69 return -ENODEV;70 71 memset(&io, 0, sizeof(io));72 io.addr_source = SI_PCI;73 dev_info(&pdev->dev, "probing via PCI");74 75 switch (pdev->class) {76 case PCI_CLASS_SERIAL_IPMI_SMIC:77 io.si_type = SI_SMIC;78 break;79 80 case PCI_CLASS_SERIAL_IPMI_KCS:81 io.si_type = SI_KCS;82 break;83 84 case PCI_CLASS_SERIAL_IPMI_BT:85 io.si_type = SI_BT;86 break;87 88 default:89 dev_info(&pdev->dev, "Unknown IPMI class: %x\n", pdev->class);90 return -ENOMEM;91 }92 93 rv = pcim_enable_device(pdev);94 if (rv) {95 dev_err(&pdev->dev, "couldn't enable PCI device\n");96 return rv;97 }98 99 if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {100 if (!IS_ENABLED(CONFIG_HAS_IOPORT))101 return -ENXIO;102 103 io.addr_space = IPMI_IO_ADDR_SPACE;104 io.io_setup = ipmi_si_port_setup;105 } else {106 io.addr_space = IPMI_MEM_ADDR_SPACE;107 io.io_setup = ipmi_si_mem_setup;108 }109 io.addr_data = pci_resource_start(pdev, 0);110 111 io.dev = &pdev->dev;112 113 io.regspacing = ipmi_pci_probe_regspacing(&io);114 io.regsize = DEFAULT_REGSIZE;115 io.regshift = 0;116 117 io.irq = pdev->irq;118 if (io.irq)119 io.irq_setup = ipmi_std_irq_setup;120 121 dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n",122 &pdev->resource[0], io.regsize, io.regspacing, io.irq);123 124 return ipmi_si_add_smi(&io);125}126 127static void ipmi_pci_remove(struct pci_dev *pdev)128{129 ipmi_si_remove_by_dev(&pdev->dev);130}131 132static const struct pci_device_id ipmi_pci_devices[] = {133 { PCI_VDEVICE(HP, PCI_DEVICE_ID_HP_MMC) },134 { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_SMIC, ~0) },135 { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_KCS, ~0) },136 { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_IPMI_BT, ~0) },137 { 0, }138};139MODULE_DEVICE_TABLE(pci, ipmi_pci_devices);140 141static struct pci_driver ipmi_pci_driver = {142 .name = SI_DEVICE_NAME,143 .id_table = ipmi_pci_devices,144 .probe = ipmi_pci_probe,145 .remove = ipmi_pci_remove,146};147 148void ipmi_si_pci_init(void)149{150 if (si_trypci) {151 int rv = pci_register_driver(&ipmi_pci_driver);152 if (rv)153 pr_err("Unable to register PCI driver: %d\n", rv);154 else155 pci_registered = true;156 }157}158 159void ipmi_si_pci_shutdown(void)160{161 if (pci_registered)162 pci_unregister_driver(&ipmi_pci_driver);163}164