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Commit 9f88145f authored by Corey Minyard's avatar Corey Minyard
Browse files

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: default avatarCorey Minyard <cminyard@mvista.com>
Cc: Andy Lutomirski <luto@kernel.org>
parent cdea4656

drivers/char/ipmi/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
menuconfig IPMI_HANDLER

       tristate 'IPMI top-level message handler'

       depends on HAS_IOMEM

       select IPMI_DMI_DECODE if DMI

       help

         This enables the central IPMI message handler, required for IPMI

	 to work.
@@ -16,6 +17,9 @@ menuconfig IPMI_HANDLER 


	 If unsure, say N.



config IPMI_DMI_DECODE

       bool



if IPMI_HANDLER



config IPMI_PANIC_EVENT

drivers/char/ipmi/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ ipmi_si-y := ipmi_si_intf.o ipmi_kcs_sm.o ipmi_smic_sm.o ipmi_bt_sm.o 
obj-$(CONFIG_IPMI_HANDLER) += ipmi_msghandler.o

obj-$(CONFIG_IPMI_DEVICE_INTERFACE) += ipmi_devintf.o

obj-$(CONFIG_IPMI_SI) += ipmi_si.o

obj-$(CONFIG_IPMI_DMI_DECODE) += ipmi_dmi.o

obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o

obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o

obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o

drivers/char/ipmi/ipmi_dmi.c

0 → 100644
+273 −0
Original line number Diff line number Diff line 
/*

 * 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_dmi.h"



struct ipmi_dmi_info {

	int 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[4] = {

		PROPERTY_ENTRY_U8("slave-addr", slave_addr),

		PROPERTY_ENTRY_U8("ipmi-type", type),

		PROPERTY_ENTRY_U16("i2c-addr", base_addr),

		{ }

	};

	char *name, *override;

	int rv;

	struct ipmi_dmi_info *info;



	info = kmalloc(sizeof(*info), GFP_KERNEL);

	if (!info) {

		pr_warn("ipmi:dmi: Could not allocate dmi info\n");

	} else {

		info->type = type;

		info->flags = flags;

		info->addr = base_addr;

		info->slave_addr = slave_addr;

		info->next = ipmi_dmi_infos;

		ipmi_dmi_infos = info;

	}



	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;

		break;

	case IPMI_DMI_TYPE_BT:

		size = 3;

		break;

	case IPMI_DMI_TYPE_KCS:

	case IPMI_DMI_TYPE_SMIC:

		size = 2;

		break;

	default:

		pr_err("ipmi:dmi: Invalid IPMI type: %d", type);

		return;

	}



	pdev = platform_device_alloc(name, ipmi_dmi_nr);

	if (!pdev) {

		pr_err("ipmi:dmi: Error allocation IPMI platform device");

		return;

	}

	pdev->driver_override = override;



	if (type == IPMI_DMI_TYPE_SSIF)

		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(int type, u32 flags, unsigned long base_addr)

{

	struct ipmi_dmi_info *info = ipmi_dmi_infos;



	while (info) {

		if (info->type == 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");

				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);

drivers/char/ipmi/ipmi_dmi.h

0 → 100644
+12 −0
Original line number Diff line number Diff line 
/*

 * DMI defines for use by IPMI

 */



#define IPMI_DMI_TYPE_KCS	0x01

#define IPMI_DMI_TYPE_SMIC	0x02

#define IPMI_DMI_TYPE_BT	0x03

#define IPMI_DMI_TYPE_SSIF	0x04



#ifdef CONFIG_IPMI_DMI_DECODE

int ipmi_dmi_get_slave_addr(int type, u32 flags, unsigned long base_addr);

#endif