175 lines
3.8 KiB
C
175 lines
3.8 KiB
C
// 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 = 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);
|
|
}
|