298 lines
6.6 KiB
C
298 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* A hack to create a platform device from a DMI entry. This will
|
|
* allow autoloading of the IPMI drive based on SMBIOS entries.
|
|
*/
|
|
|
|
#include <linux/ipmi.h>
|
|
#include <linux/init.h>
|
|
#include <linux/dmi.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/property.h>
|
|
#include "ipmi_si_sm.h"
|
|
#include "ipmi_dmi.h"
|
|
|
|
#define IPMI_DMI_TYPE_KCS 0x01
|
|
#define IPMI_DMI_TYPE_SMIC 0x02
|
|
#define IPMI_DMI_TYPE_BT 0x03
|
|
#define IPMI_DMI_TYPE_SSIF 0x04
|
|
|
|
struct ipmi_dmi_info {
|
|
enum si_type si_type;
|
|
u32 flags;
|
|
unsigned long addr;
|
|
u8 slave_addr;
|
|
struct ipmi_dmi_info *next;
|
|
};
|
|
|
|
static struct ipmi_dmi_info *ipmi_dmi_infos;
|
|
|
|
static int ipmi_dmi_nr __initdata;
|
|
|
|
static void __init dmi_add_platform_ipmi(unsigned long base_addr,
|
|
u32 flags,
|
|
u8 slave_addr,
|
|
int irq,
|
|
int offset,
|
|
int type)
|
|
{
|
|
struct platform_device *pdev;
|
|
struct resource r[4];
|
|
unsigned int num_r = 1, size;
|
|
struct property_entry p[5];
|
|
unsigned int pidx = 0;
|
|
char *name, *override;
|
|
int rv;
|
|
enum si_type si_type;
|
|
struct ipmi_dmi_info *info;
|
|
|
|
memset(p, 0, sizeof(p));
|
|
|
|
name = "dmi-ipmi-si";
|
|
override = "ipmi_si";
|
|
switch (type) {
|
|
case IPMI_DMI_TYPE_SSIF:
|
|
name = "dmi-ipmi-ssif";
|
|
override = "ipmi_ssif";
|
|
offset = 1;
|
|
size = 1;
|
|
si_type = SI_TYPE_INVALID;
|
|
break;
|
|
case IPMI_DMI_TYPE_BT:
|
|
size = 3;
|
|
si_type = SI_BT;
|
|
break;
|
|
case IPMI_DMI_TYPE_KCS:
|
|
size = 2;
|
|
si_type = SI_KCS;
|
|
break;
|
|
case IPMI_DMI_TYPE_SMIC:
|
|
size = 2;
|
|
si_type = SI_SMIC;
|
|
break;
|
|
default:
|
|
pr_err("ipmi:dmi: Invalid IPMI type: %d\n", type);
|
|
return;
|
|
}
|
|
|
|
if (si_type != SI_TYPE_INVALID)
|
|
p[pidx++] = PROPERTY_ENTRY_U8("ipmi-type", si_type);
|
|
|
|
p[pidx++] = PROPERTY_ENTRY_U8("slave-addr", slave_addr);
|
|
p[pidx++] = PROPERTY_ENTRY_U8("addr-source", SI_SMBIOS);
|
|
|
|
info = kmalloc(sizeof(*info), GFP_KERNEL);
|
|
if (!info) {
|
|
pr_warn("ipmi:dmi: Could not allocate dmi info\n");
|
|
} else {
|
|
info->si_type = si_type;
|
|
info->flags = flags;
|
|
info->addr = base_addr;
|
|
info->slave_addr = slave_addr;
|
|
info->next = ipmi_dmi_infos;
|
|
ipmi_dmi_infos = info;
|
|
}
|
|
|
|
pdev = platform_device_alloc(name, ipmi_dmi_nr);
|
|
if (!pdev) {
|
|
pr_err("ipmi:dmi: Error allocation IPMI platform device\n");
|
|
return;
|
|
}
|
|
pdev->driver_override = kasprintf(GFP_KERNEL, "%s",
|
|
override);
|
|
if (!pdev->driver_override)
|
|
goto err;
|
|
|
|
if (type == IPMI_DMI_TYPE_SSIF) {
|
|
p[pidx++] = PROPERTY_ENTRY_U16("i2c-addr", base_addr);
|
|
goto add_properties;
|
|
}
|
|
|
|
memset(r, 0, sizeof(r));
|
|
|
|
r[0].start = base_addr;
|
|
r[0].end = r[0].start + offset - 1;
|
|
r[0].name = "IPMI Address 1";
|
|
r[0].flags = flags;
|
|
|
|
if (size > 1) {
|
|
r[1].start = r[0].start + offset;
|
|
r[1].end = r[1].start + offset - 1;
|
|
r[1].name = "IPMI Address 2";
|
|
r[1].flags = flags;
|
|
num_r++;
|
|
}
|
|
|
|
if (size > 2) {
|
|
r[2].start = r[1].start + offset;
|
|
r[2].end = r[2].start + offset - 1;
|
|
r[2].name = "IPMI Address 3";
|
|
r[2].flags = flags;
|
|
num_r++;
|
|
}
|
|
|
|
if (irq) {
|
|
r[num_r].start = irq;
|
|
r[num_r].end = irq;
|
|
r[num_r].name = "IPMI IRQ";
|
|
r[num_r].flags = IORESOURCE_IRQ;
|
|
num_r++;
|
|
}
|
|
|
|
rv = platform_device_add_resources(pdev, r, num_r);
|
|
if (rv) {
|
|
dev_err(&pdev->dev,
|
|
"ipmi:dmi: Unable to add resources: %d\n", rv);
|
|
goto err;
|
|
}
|
|
|
|
add_properties:
|
|
rv = platform_device_add_properties(pdev, p);
|
|
if (rv) {
|
|
dev_err(&pdev->dev,
|
|
"ipmi:dmi: Unable to add properties: %d\n", rv);
|
|
goto err;
|
|
}
|
|
|
|
rv = platform_device_add(pdev);
|
|
if (rv) {
|
|
dev_err(&pdev->dev, "ipmi:dmi: Unable to add device: %d\n", rv);
|
|
goto err;
|
|
}
|
|
|
|
ipmi_dmi_nr++;
|
|
return;
|
|
|
|
err:
|
|
platform_device_put(pdev);
|
|
}
|
|
|
|
/*
|
|
* Look up the slave address for a given interface. This is here
|
|
* because ACPI doesn't have a slave address while SMBIOS does, but we
|
|
* prefer using ACPI so the ACPI code can use the IPMI namespace.
|
|
* This function allows an ACPI-specified IPMI device to look up the
|
|
* slave address from the DMI table.
|
|
*/
|
|
int ipmi_dmi_get_slave_addr(enum si_type si_type, u32 flags,
|
|
unsigned long base_addr)
|
|
{
|
|
struct ipmi_dmi_info *info = ipmi_dmi_infos;
|
|
|
|
while (info) {
|
|
if (info->si_type == si_type &&
|
|
info->flags == flags &&
|
|
info->addr == base_addr)
|
|
return info->slave_addr;
|
|
info = info->next;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ipmi_dmi_get_slave_addr);
|
|
|
|
#define DMI_IPMI_MIN_LENGTH 0x10
|
|
#define DMI_IPMI_VER2_LENGTH 0x12
|
|
#define DMI_IPMI_TYPE 4
|
|
#define DMI_IPMI_SLAVEADDR 6
|
|
#define DMI_IPMI_ADDR 8
|
|
#define DMI_IPMI_ACCESS 0x10
|
|
#define DMI_IPMI_IRQ 0x11
|
|
#define DMI_IPMI_IO_MASK 0xfffe
|
|
|
|
static void __init dmi_decode_ipmi(const struct dmi_header *dm)
|
|
{
|
|
const u8 *data = (const u8 *) dm;
|
|
u32 flags = IORESOURCE_IO;
|
|
unsigned long base_addr;
|
|
u8 len = dm->length;
|
|
u8 slave_addr;
|
|
int irq = 0, offset;
|
|
int type;
|
|
|
|
if (len < DMI_IPMI_MIN_LENGTH)
|
|
return;
|
|
|
|
type = data[DMI_IPMI_TYPE];
|
|
slave_addr = data[DMI_IPMI_SLAVEADDR];
|
|
|
|
memcpy(&base_addr, data + DMI_IPMI_ADDR, sizeof(unsigned long));
|
|
if (len >= DMI_IPMI_VER2_LENGTH) {
|
|
if (type == IPMI_DMI_TYPE_SSIF) {
|
|
offset = 0;
|
|
flags = 0;
|
|
base_addr = data[DMI_IPMI_ADDR] >> 1;
|
|
if (base_addr == 0) {
|
|
/*
|
|
* Some broken systems put the I2C address in
|
|
* the slave address field. We try to
|
|
* accommodate them here.
|
|
*/
|
|
base_addr = data[DMI_IPMI_SLAVEADDR] >> 1;
|
|
slave_addr = 0;
|
|
}
|
|
} else {
|
|
if (base_addr & 1) {
|
|
/* I/O */
|
|
base_addr &= DMI_IPMI_IO_MASK;
|
|
} else {
|
|
/* Memory */
|
|
flags = IORESOURCE_MEM;
|
|
}
|
|
|
|
/*
|
|
* If bit 4 of byte 0x10 is set, then the lsb
|
|
* for the address is odd.
|
|
*/
|
|
base_addr |= (data[DMI_IPMI_ACCESS] >> 4) & 1;
|
|
|
|
irq = data[DMI_IPMI_IRQ];
|
|
|
|
/*
|
|
* The top two bits of byte 0x10 hold the
|
|
* register spacing.
|
|
*/
|
|
switch ((data[DMI_IPMI_ACCESS] >> 6) & 3) {
|
|
case 0: /* Byte boundaries */
|
|
offset = 1;
|
|
break;
|
|
case 1: /* 32-bit boundaries */
|
|
offset = 4;
|
|
break;
|
|
case 2: /* 16-byte boundaries */
|
|
offset = 16;
|
|
break;
|
|
default:
|
|
pr_err("ipmi:dmi: Invalid offset: 0\n");
|
|
return;
|
|
}
|
|
}
|
|
} else {
|
|
/* Old DMI spec. */
|
|
/*
|
|
* Note that technically, the lower bit of the base
|
|
* address should be 1 if the address is I/O and 0 if
|
|
* the address is in memory. So many systems get that
|
|
* wrong (and all that I have seen are I/O) so we just
|
|
* ignore that bit and assume I/O. Systems that use
|
|
* memory should use the newer spec, anyway.
|
|
*/
|
|
base_addr = base_addr & DMI_IPMI_IO_MASK;
|
|
offset = 1;
|
|
}
|
|
|
|
dmi_add_platform_ipmi(base_addr, flags, slave_addr, irq,
|
|
offset, type);
|
|
}
|
|
|
|
static int __init scan_for_dmi_ipmi(void)
|
|
{
|
|
const struct dmi_device *dev = NULL;
|
|
|
|
while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev)))
|
|
dmi_decode_ipmi((const struct dmi_header *) dev->device_data);
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(scan_for_dmi_ipmi);
|