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// 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);
}
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