1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * ipmi_si_pci.c 4 * 5 * Handling for IPMI devices on the PCI bus. 6 */ 7 8 #define pr_fmt(fmt) "ipmi_pci: " fmt 9 10 #include <linux/module.h> 11 #include <linux/pci.h> 12 #include "ipmi_si.h" 13 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 22 #define PCI_DEVICE_ID_HP_MMC 0x121A 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)) { 44 dev_err(io->dev, "Could not setup I/O space\n"); 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 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 69 static int ipmi_pci_probe(struct pci_dev *pdev, 70 const struct pci_device_id *ent) 71 { 72 int rv; 73 struct si_sm_io io; 74 75 if (pci_match_id(ipmi_pci_blacklist, pdev)) 76 return -ENODEV; 77 78 memset(&io, 0, sizeof(io)); 79 io.addr_source = SI_PCI; 80 dev_info(&pdev->dev, "probing via PCI"); 81 82 switch (pdev->class) { 83 case PCI_CLASS_SERIAL_IPMI_SMIC: 84 io.si_type = SI_SMIC; 85 break; 86 87 case PCI_CLASS_SERIAL_IPMI_KCS: 88 io.si_type = SI_KCS; 89 break; 90 91 case PCI_CLASS_SERIAL_IPMI_BT: 92 io.si_type = SI_BT; 93 break; 94 95 default: 96 dev_info(&pdev->dev, "Unknown IPMI class: %x\n", pdev->class); 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; 108 109 if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) { 110 io.addr_space = IPMI_IO_ADDR_SPACE; 111 io.io_setup = ipmi_si_port_setup; 112 } else { 113 io.addr_space = IPMI_MEM_ADDR_SPACE; 114 io.io_setup = ipmi_si_mem_setup; 115 } 116 io.addr_data = pci_resource_start(pdev, 0); 117 118 io.dev = &pdev->dev; 119 120 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; 127 128 dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n", 129 &pdev->resource[0], io.regsize, io.regspacing, io.irq); 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[] = { 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) }, 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) 164 pr_err("Unable to register PCI driver: %d\n", rv); 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 } 175