diff options
Diffstat (limited to 'drivers/char/ipmi/ipmi_si_pci.c')
| -rw-r--r-- | drivers/char/ipmi/ipmi_si_pci.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/drivers/char/ipmi/ipmi_si_pci.c b/drivers/char/ipmi/ipmi_si_pci.c new file mode 100644 index 000000000..95bbcfba5 --- /dev/null +++ b/drivers/char/ipmi/ipmi_si_pci.c @@ -0,0 +1,174 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * ipmi_si_pci.c + * + * Handling for IPMI devices on the PCI bus. + */ + +#define pr_fmt(fmt) "ipmi_pci: " fmt + +#include <linux/module.h> +#include <linux/pci.h> +#include "ipmi_si.h" + +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_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_space = IPMI_IO_ADDR_SPACE; + io.io_setup = ipmi_si_port_setup; + } else { + io.addr_space = IPMI_MEM_ADDR_SPACE; + io.io_setup = ipmi_si_mem_setup; + } + io.addr_data = pci_resource_start(pdev, 0); + + io.dev = &pdev->dev; + + 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; + + 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 = SI_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("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); +} |