forked from Minki/linux
ipmi: Create a platform device for a DMI-specified IPMI interface
Create a platform device for each IPMI device in the DMI table, a separate kind of device for SSIF types and for KCS, BT, and SMIC types. This is so auto-loading IPMI devices will work from just SMBIOS tables. This also adds the ability to extract the slave address from the SMBIOS tables, so that when the driver uses ACPI-specified interfaces, it can still extract the slave address from SMBIOS. Signed-off-by: Corey Minyard <cminyard@mvista.com> Cc: Andy Lutomirski <luto@kernel.org>
This commit is contained in:
Corey Minyard
parent
cdea46566b
commit
9f88145f18
@ -5,6 +5,7 @@
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menuconfig IPMI_HANDLER
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tristate 'IPMI top-level message handler'
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depends on HAS_IOMEM
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select IPMI_DMI_DECODE if DMI
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help
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This enables the central IPMI message handler, required for IPMI
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to work.
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@ -16,6 +17,9 @@ menuconfig IPMI_HANDLER
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If unsure, say N.
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config IPMI_DMI_DECODE
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bool
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if IPMI_HANDLER
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config IPMI_PANIC_EVENT
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@ -7,6 +7,7 @@ ipmi_si-y := ipmi_si_intf.o ipmi_kcs_sm.o ipmi_smic_sm.o ipmi_bt_sm.o
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obj-$(CONFIG_IPMI_HANDLER) += ipmi_msghandler.o
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obj-$(CONFIG_IPMI_DEVICE_INTERFACE) += ipmi_devintf.o
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obj-$(CONFIG_IPMI_SI) += ipmi_si.o
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obj-$(CONFIG_IPMI_DMI_DECODE) += ipmi_dmi.o
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obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o
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obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o
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obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o
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273
drivers/char/ipmi/ipmi_dmi.c
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273
drivers/char/ipmi/ipmi_dmi.c
Normal file
@ -0,0 +1,273 @@
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/*
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* A hack to create a platform device from a DMI entry. This will
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* allow autoloading of the IPMI drive based on SMBIOS entries.
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*/
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#include <linux/ipmi.h>
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#include <linux/init.h>
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#include <linux/dmi.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include "ipmi_dmi.h"
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struct ipmi_dmi_info {
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int type;
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u32 flags;
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unsigned long addr;
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u8 slave_addr;
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struct ipmi_dmi_info *next;
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};
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static struct ipmi_dmi_info *ipmi_dmi_infos;
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static int ipmi_dmi_nr __initdata;
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static void __init dmi_add_platform_ipmi(unsigned long base_addr,
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u32 flags,
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u8 slave_addr,
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int irq,
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int offset,
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int type)
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{
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struct platform_device *pdev;
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struct resource r[4];
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unsigned int num_r = 1, size;
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struct property_entry p[4] = {
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PROPERTY_ENTRY_U8("slave-addr", slave_addr),
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PROPERTY_ENTRY_U8("ipmi-type", type),
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PROPERTY_ENTRY_U16("i2c-addr", base_addr),
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{ }
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};
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char *name, *override;
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int rv;
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struct ipmi_dmi_info *info;
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info = kmalloc(sizeof(*info), GFP_KERNEL);
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if (!info) {
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pr_warn("ipmi:dmi: Could not allocate dmi info\n");
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} else {
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info->type = type;
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info->flags = flags;
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info->addr = base_addr;
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info->slave_addr = slave_addr;
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info->next = ipmi_dmi_infos;
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ipmi_dmi_infos = info;
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}
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name = "dmi-ipmi-si";
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override = "ipmi_si";
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switch (type) {
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case IPMI_DMI_TYPE_SSIF:
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name = "dmi-ipmi-ssif";
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override = "ipmi_ssif";
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offset = 1;
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size = 1;
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break;
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case IPMI_DMI_TYPE_BT:
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size = 3;
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break;
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case IPMI_DMI_TYPE_KCS:
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case IPMI_DMI_TYPE_SMIC:
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size = 2;
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break;
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default:
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pr_err("ipmi:dmi: Invalid IPMI type: %d", type);
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return;
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}
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pdev = platform_device_alloc(name, ipmi_dmi_nr);
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if (!pdev) {
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pr_err("ipmi:dmi: Error allocation IPMI platform device");
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return;
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}
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pdev->driver_override = override;
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if (type == IPMI_DMI_TYPE_SSIF)
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goto add_properties;
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memset(r, 0, sizeof(r));
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r[0].start = base_addr;
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r[0].end = r[0].start + offset - 1;
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r[0].name = "IPMI Address 1";
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r[0].flags = flags;
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if (size > 1) {
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r[1].start = r[0].start + offset;
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r[1].end = r[1].start + offset - 1;
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r[1].name = "IPMI Address 2";
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r[1].flags = flags;
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num_r++;
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}
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if (size > 2) {
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r[2].start = r[1].start + offset;
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r[2].end = r[2].start + offset - 1;
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r[2].name = "IPMI Address 3";
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r[2].flags = flags;
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num_r++;
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}
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if (irq) {
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r[num_r].start = irq;
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r[num_r].end = irq;
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r[num_r].name = "IPMI IRQ";
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r[num_r].flags = IORESOURCE_IRQ;
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num_r++;
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}
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rv = platform_device_add_resources(pdev, r, num_r);
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if (rv) {
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dev_err(&pdev->dev,
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"ipmi:dmi: Unable to add resources: %d\n", rv);
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goto err;
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}
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add_properties:
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rv = platform_device_add_properties(pdev, p);
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if (rv) {
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dev_err(&pdev->dev,
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"ipmi:dmi: Unable to add properties: %d\n", rv);
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goto err;
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}
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rv = platform_device_add(pdev);
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if (rv) {
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dev_err(&pdev->dev, "ipmi:dmi: Unable to add device: %d\n", rv);
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goto err;
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}
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ipmi_dmi_nr++;
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return;
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err:
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platform_device_put(pdev);
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}
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/*
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* Look up the slave address for a given interface. This is here
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* because ACPI doesn't have a slave address while SMBIOS does, but we
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* prefer using ACPI so the ACPI code can use the IPMI namespace.
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* This function allows an ACPI-specified IPMI device to look up the
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* slave address from the DMI table.
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*/
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int ipmi_dmi_get_slave_addr(int type, u32 flags, unsigned long base_addr)
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{
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struct ipmi_dmi_info *info = ipmi_dmi_infos;
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while (info) {
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if (info->type == type &&
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info->flags == flags &&
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info->addr == base_addr)
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return info->slave_addr;
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info = info->next;
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}
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return 0;
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}
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EXPORT_SYMBOL(ipmi_dmi_get_slave_addr);
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#define DMI_IPMI_MIN_LENGTH 0x10
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#define DMI_IPMI_VER2_LENGTH 0x12
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#define DMI_IPMI_TYPE 4
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#define DMI_IPMI_SLAVEADDR 6
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#define DMI_IPMI_ADDR 8
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#define DMI_IPMI_ACCESS 0x10
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#define DMI_IPMI_IRQ 0x11
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#define DMI_IPMI_IO_MASK 0xfffe
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static void __init dmi_decode_ipmi(const struct dmi_header *dm)
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{
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const u8 *data = (const u8 *) dm;
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u32 flags = IORESOURCE_IO;
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unsigned long base_addr;
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u8 len = dm->length;
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u8 slave_addr;
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int irq = 0, offset;
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int type;
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if (len < DMI_IPMI_MIN_LENGTH)
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return;
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type = data[DMI_IPMI_TYPE];
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slave_addr = data[DMI_IPMI_SLAVEADDR];
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memcpy(&base_addr, data + DMI_IPMI_ADDR, sizeof(unsigned long));
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if (len >= DMI_IPMI_VER2_LENGTH) {
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if (type == IPMI_DMI_TYPE_SSIF) {
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offset = 0;
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flags = 0;
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base_addr = data[DMI_IPMI_ADDR] >> 1;
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if (base_addr == 0) {
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/*
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* Some broken systems put the I2C address in
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* the slave address field. We try to
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* accommodate them here.
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*/
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base_addr = data[DMI_IPMI_SLAVEADDR] >> 1;
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slave_addr = 0;
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}
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} else {
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if (base_addr & 1) {
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/* I/O */
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base_addr &= DMI_IPMI_IO_MASK;
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} else {
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/* Memory */
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flags = IORESOURCE_MEM;
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}
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/*
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* If bit 4 of byte 0x10 is set, then the lsb
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* for the address is odd.
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*/
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base_addr |= (data[DMI_IPMI_ACCESS] >> 4) & 1;
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irq = data[DMI_IPMI_IRQ];
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/*
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* The top two bits of byte 0x10 hold the
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* register spacing.
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*/
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switch ((data[DMI_IPMI_ACCESS] >> 6) & 3) {
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case 0: /* Byte boundaries */
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offset = 1;
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break;
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case 1: /* 32-bit boundaries */
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offset = 4;
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break;
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case 2: /* 16-byte boundaries */
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offset = 16;
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break;
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default:
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pr_err("ipmi:dmi: Invalid offset: 0");
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return;
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}
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}
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} else {
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/* Old DMI spec. */
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/*
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* Note that technically, the lower bit of the base
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* address should be 1 if the address is I/O and 0 if
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* the address is in memory. So many systems get that
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* wrong (and all that I have seen are I/O) so we just
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* ignore that bit and assume I/O. Systems that use
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* memory should use the newer spec, anyway.
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*/
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base_addr = base_addr & DMI_IPMI_IO_MASK;
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offset = 1;
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}
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dmi_add_platform_ipmi(base_addr, flags, slave_addr, irq,
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offset, type);
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}
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static int __init scan_for_dmi_ipmi(void)
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{
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const struct dmi_device *dev = NULL;
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while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev)))
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dmi_decode_ipmi((const struct dmi_header *) dev->device_data);
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return 0;
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}
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subsys_initcall(scan_for_dmi_ipmi);
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12
drivers/char/ipmi/ipmi_dmi.h
Normal file
12
drivers/char/ipmi/ipmi_dmi.h
Normal file
@ -0,0 +1,12 @@
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/*
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* DMI defines for use by IPMI
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*/
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#define IPMI_DMI_TYPE_KCS 0x01
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#define IPMI_DMI_TYPE_SMIC 0x02
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#define IPMI_DMI_TYPE_BT 0x03
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#define IPMI_DMI_TYPE_SSIF 0x04
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#ifdef CONFIG_IPMI_DMI_DECODE
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int ipmi_dmi_get_slave_addr(int type, u32 flags, unsigned long base_addr);
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#endif
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