MCA: delete all remaining traces of microchannel bus support.

Hardware with MCA bus is limited to 386 and 486 class machines
that are now 20+ years old and typically with less than 32MB
of memory.  A quick search on the internet, and you see that
even the MCA hobbyist/enthusiast community has lost interest
in the early 2000 era and never really even moved ahead from
the 2.4 kernels to the 2.6 series.

This deletes anything remaining related to CONFIG_MCA from core
kernel code and from the x86 architecture.  There is no point in
carrying this any further into the future.

One complication to watch for is inadvertently scooping up
stuff relating to machine check, since there is overlap in
the TLA name space (e.g. arch/x86/boot/mca.c).

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: x86@kernel.org
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

15 files changed, 9 insertions, 788 deletions

diff --git a/arch/frv/include/asm/processor.h b/arch/frv/include/asm/processor.h
index 81c2e271d620..4a53811cd4cd 100644
--- a/arch/frv/include/asm/processor.h
+++ b/arch/frv/include/asm/processor.h
@@ -54,7 +54,6 @@ extern struct cpuinfo_frv __nongprelbss boot_cpu_data;
  * Bus types
  */
 #define EISA_bus 0
-#define MCA_bus 0
 
 struct thread_struct {
 	struct pt_regs		*frame;		/* [GR28] exception frame ptr for this thread */
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c9866b0b77d8..9137057152c3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2023,16 +2023,6 @@ config EISA
 
 source "drivers/eisa/Kconfig"
 
-config MCA
-	bool "MCA support"
-	---help---
-	  MicroChannel Architecture is found in some IBM PS/2 machines and
-	  laptops.  It is a bus system similar to PCI or ISA. See
-	  <file:Documentation/mca.txt> (and especially the web page given
-	  there) before attempting to build an MCA bus kernel.
-
-source "drivers/mca/Kconfig"
-
 config SCx200
 	tristate "NatSemi SCx200 support"
 	---help---
diff --git a/arch/x86/include/asm/mca.h b/arch/x86/include/asm/mca.h
deleted file mode 100644
index eedbb6cc1efb..000000000000
--- a/arch/x86/include/asm/mca.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8 -*- */
-
-/* Platform specific MCA defines */
-#ifndef _ASM_X86_MCA_H
-#define _ASM_X86_MCA_H
-
-/* Maximal number of MCA slots - actually, some machines have less, but
- * they all have sufficient number of POS registers to cover 8.
- */
-#define MCA_MAX_SLOT_NR  8
-
-/* Most machines have only one MCA bus.  The only multiple bus machines
- * I know have at most two */
-#define MAX_MCA_BUSSES 2
-
-#define MCA_PRIMARY_BUS		0
-#define MCA_SECONDARY_BUS	1
-
-/* Dummy slot numbers on primary MCA for integrated functions */
-#define MCA_INTEGSCSI	(MCA_MAX_SLOT_NR)
-#define MCA_INTEGVIDEO	(MCA_MAX_SLOT_NR+1)
-#define MCA_MOTHERBOARD (MCA_MAX_SLOT_NR+2)
-
-/* Dummy POS values for integrated functions */
-#define MCA_DUMMY_POS_START	0x10000
-#define MCA_INTEGSCSI_POS	(MCA_DUMMY_POS_START+1)
-#define MCA_INTEGVIDEO_POS	(MCA_DUMMY_POS_START+2)
-#define MCA_MOTHERBOARD_POS	(MCA_DUMMY_POS_START+3)
-
-/* MCA registers */
-
-#define MCA_MOTHERBOARD_SETUP_REG	0x94
-#define MCA_ADAPTER_SETUP_REG		0x96
-#define MCA_POS_REG(n)			(0x100+(n))
-
-#define MCA_ENABLED	0x01	/* POS 2, set if adapter enabled */
-
-/* Max number of adapters, including both slots and various integrated
- * things.
- */
-#define MCA_NUMADAPTERS (MCA_MAX_SLOT_NR+3)
-
-#endif /* _ASM_X86_MCA_H */
diff --git a/arch/x86/include/asm/mca_dma.h b/arch/x86/include/asm/mca_dma.h
deleted file mode 100644
index 45271aef82dd..000000000000
--- a/arch/x86/include/asm/mca_dma.h
+++ /dev/null
@@ -1,201 +0,0 @@
-#ifndef _ASM_X86_MCA_DMA_H
-#define _ASM_X86_MCA_DMA_H
-
-#include <asm/io.h>
-#include <linux/ioport.h>
-
-/*
- * Microchannel specific DMA stuff.  DMA on an MCA machine is fairly similar to
- *   standard PC dma, but it certainly has its quirks.  DMA register addresses
- *   are in a different place and there are some added functions.  Most of this
- *   should be pretty obvious on inspection.  Note that the user must divide
- *   count by 2 when using 16-bit dma; that is not handled by these functions.
- *
- * Ramen Noodles are yummy.
- *
- *  1998 Tymm Twillman <tymm@computer.org>
- */
-
-/*
- * Registers that are used by the DMA controller; FN is the function register
- *   (tell the controller what to do) and EXE is the execution register (how
- *   to do it)
- */
-
-#define MCA_DMA_REG_FN  0x18
-#define MCA_DMA_REG_EXE 0x1A
-
-/*
- * Functions that the DMA controller can do
- */
-
-#define MCA_DMA_FN_SET_IO       0x00
-#define MCA_DMA_FN_SET_ADDR     0x20
-#define MCA_DMA_FN_GET_ADDR     0x30
-#define MCA_DMA_FN_SET_COUNT    0x40
-#define MCA_DMA_FN_GET_COUNT    0x50
-#define MCA_DMA_FN_GET_STATUS   0x60
-#define MCA_DMA_FN_SET_MODE     0x70
-#define MCA_DMA_FN_SET_ARBUS    0x80
-#define MCA_DMA_FN_MASK         0x90
-#define MCA_DMA_FN_RESET_MASK   0xA0
-#define MCA_DMA_FN_MASTER_CLEAR 0xD0
-
-/*
- * Modes (used by setting MCA_DMA_FN_MODE in the function register)
- *
- * Note that the MODE_READ is read from memory (write to device), and
- *   MODE_WRITE is vice-versa.
- */
-
-#define MCA_DMA_MODE_XFER  0x04  /* read by default */
-#define MCA_DMA_MODE_READ  0x04  /* same as XFER */
-#define MCA_DMA_MODE_WRITE 0x08  /* OR with MODE_XFER to use */
-#define MCA_DMA_MODE_IO    0x01  /* DMA from IO register */
-#define MCA_DMA_MODE_16    0x40  /* 16 bit xfers */
-
-
-/**
- *	mca_enable_dma	-	channel to enable DMA on
- *	@dmanr: DMA channel
- *
- *	Enable the MCA bus DMA on a channel. This can be called from
- *	IRQ context.
- */
-
-static inline void mca_enable_dma(unsigned int dmanr)
-{
-	outb(MCA_DMA_FN_RESET_MASK | dmanr, MCA_DMA_REG_FN);
-}
-
-/**
- *	mca_disble_dma	-	channel to disable DMA on
- *	@dmanr: DMA channel
- *
- *	Enable the MCA bus DMA on a channel. This can be called from
- *	IRQ context.
- */
-
-static inline void mca_disable_dma(unsigned int dmanr)
-{
-	outb(MCA_DMA_FN_MASK | dmanr, MCA_DMA_REG_FN);
-}
-
-/**
- *	mca_set_dma_addr -	load a 24bit DMA address
- *	@dmanr: DMA channel
- *	@a: 24bit bus address
- *
- *	Load the address register in the DMA controller. This has a 24bit
- *	limitation (16Mb).
- */
-
-static inline void mca_set_dma_addr(unsigned int dmanr, unsigned int a)
-{
-	outb(MCA_DMA_FN_SET_ADDR | dmanr, MCA_DMA_REG_FN);
-	outb(a & 0xff, MCA_DMA_REG_EXE);
-	outb((a >> 8) & 0xff, MCA_DMA_REG_EXE);
-	outb((a >> 16) & 0xff, MCA_DMA_REG_EXE);
-}
-
-/**
- *	mca_get_dma_addr -	load a 24bit DMA address
- *	@dmanr: DMA channel
- *
- *	Read the address register in the DMA controller. This has a 24bit
- *	limitation (16Mb). The return is a bus address.
- */
-
-static inline unsigned int mca_get_dma_addr(unsigned int dmanr)
-{
-	unsigned int addr;
-
-	outb(MCA_DMA_FN_GET_ADDR | dmanr, MCA_DMA_REG_FN);
-	addr = inb(MCA_DMA_REG_EXE);
-	addr |= inb(MCA_DMA_REG_EXE) << 8;
-	addr |= inb(MCA_DMA_REG_EXE) << 16;
-
-	return addr;
-}
-
-/**
- *	mca_set_dma_count -	load a 16bit transfer count
- *	@dmanr: DMA channel
- *	@count: count
- *
- *	Set the DMA count for this channel. This can be up to 64Kbytes.
- *	Setting a count of zero will not do what you expect.
- */
-
-static inline void mca_set_dma_count(unsigned int dmanr, unsigned int count)
-{
-	count--;  /* transfers one more than count -- correct for this */
-
-	outb(MCA_DMA_FN_SET_COUNT | dmanr, MCA_DMA_REG_FN);
-	outb(count & 0xff, MCA_DMA_REG_EXE);
-	outb((count >> 8) & 0xff, MCA_DMA_REG_EXE);
-}
-
-/**
- *	mca_get_dma_residue -	get the remaining bytes to transfer
- *	@dmanr: DMA channel
- *
- *	This function returns the number of bytes left to transfer
- *	on this DMA channel.
- */
-
-static inline unsigned int mca_get_dma_residue(unsigned int dmanr)
-{
-	unsigned short count;
-
-	outb(MCA_DMA_FN_GET_COUNT | dmanr, MCA_DMA_REG_FN);
-	count = 1 + inb(MCA_DMA_REG_EXE);
-	count += inb(MCA_DMA_REG_EXE) << 8;
-
-	return count;
-}
-
-/**
- *	mca_set_dma_io -	set the port for an I/O transfer
- *	@dmanr: DMA channel
- *	@io_addr: an I/O port number
- *
- *	Unlike the ISA bus DMA controllers the DMA on MCA bus can transfer
- *	with an I/O port target.
- */
-
-static inline void mca_set_dma_io(unsigned int dmanr, unsigned int io_addr)
-{
-	/*
-	 * DMA from a port address -- set the io address
-	 */
-
-	outb(MCA_DMA_FN_SET_IO | dmanr, MCA_DMA_REG_FN);
-	outb(io_addr & 0xff, MCA_DMA_REG_EXE);
-	outb((io_addr >>  8) & 0xff, MCA_DMA_REG_EXE);
-}
-
-/**
- *	mca_set_dma_mode -	set the DMA mode
- *	@dmanr: DMA channel
- *	@mode: mode to set
- *
- *	The DMA controller supports several modes. The mode values you can
- *	set are-
- *
- *	%MCA_DMA_MODE_READ when reading from the DMA device.
- *
- *	%MCA_DMA_MODE_WRITE to writing to the DMA device.
- *
- *	%MCA_DMA_MODE_IO to do DMA to or from an I/O port.
- *
- *	%MCA_DMA_MODE_16 to do 16bit transfers.
- */
-
-static inline void mca_set_dma_mode(unsigned int dmanr, unsigned int mode)
-{
-	outb(MCA_DMA_FN_SET_MODE | dmanr, MCA_DMA_REG_FN);
-	outb(mode, MCA_DMA_REG_EXE);
-}
-
-#endif /* _ASM_X86_MCA_DMA_H */
diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index 9c7d95f6174b..3e2f42a4b872 100644
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -40,7 +40,7 @@ extern int quad_local_to_mp_bus_id [NR_CPUS/4][4];
 
 #endif /* CONFIG_X86_64 */
 
-#if defined(CONFIG_MCA) || defined(CONFIG_EISA)
+#ifdef CONFIG_EISA
 extern int mp_bus_id_to_type[MAX_MP_BUSSES];
 #endif
 
diff --git a/arch/x86/include/asm/mpspec_def.h b/arch/x86/include/asm/mpspec_def.h
index c0a955a9a087..b31f8c098271 100644
--- a/arch/x86/include/asm/mpspec_def.h
+++ b/arch/x86/include/asm/mpspec_def.h
@@ -84,7 +84,7 @@ struct mpc_bus {
 #define BUSTYPE_EISA	"EISA"
 #define BUSTYPE_ISA	"ISA"
 #define BUSTYPE_INTERN	"INTERN"	/* Internal BUS */
-#define BUSTYPE_MCA	"MCA"
+#define BUSTYPE_MCA	"MCA"		/* Obsolete */
 #define BUSTYPE_VL	"VL"		/* Local bus */
 #define BUSTYPE_PCI	"PCI"
 #define BUSTYPE_PCMCIA	"PCMCIA"
@@ -169,6 +169,5 @@ enum mp_bustype {
 	MP_BUS_ISA = 1,
 	MP_BUS_EISA,
 	MP_BUS_PCI,
-	MP_BUS_MCA,
 };
 #endif /* _ASM_X86_MPSPEC_DEF_H */
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 532d2e090e6f..7d1569947204 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -49,7 +49,6 @@ obj-y				+= cpu/
 obj-y				+= acpi/
 obj-y				+= reboot.o
 obj-$(CONFIG_X86_32)		+= reboot_32.o
-obj-$(CONFIG_MCA)		+= mca_32.o
 obj-$(CONFIG_X86_MSR)		+= msr.o
 obj-$(CONFIG_X86_CPUID)		+= cpuid.o
 obj-$(CONFIG_PCI)		+= early-quirks.o
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index a415b1f44365..f564b189de1a 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -990,7 +990,7 @@ void __init mp_config_acpi_legacy_irqs(void)
 	int i;
 	struct mpc_intsrc mp_irq;
 
-#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
+#ifdef CONFIG_EISA
 	/*
 	 * Fabricate the legacy ISA bus (bus #31).
 	 */
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index e88300d8e80a..675e9045a3c5 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -142,7 +142,7 @@ int mp_irq_entries;
 /* GSI interrupts */
 static int nr_irqs_gsi = NR_IRQS_LEGACY;
 
-#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
+#ifdef CONFIG_EISA
 int mp_bus_id_to_type[MAX_MP_BUSSES];
 #endif
 
@@ -875,7 +875,7 @@ static int __init find_isa_irq_apic(int irq, int type)
 	return -1;
 }
 
-#if defined(CONFIG_EISA) || defined(CONFIG_MCA)
+#ifdef CONFIG_EISA
 /*
  * EISA Edge/Level control register, ELCR
  */
@@ -912,12 +912,6 @@ static int EISA_ELCR(unsigned int irq)
 #define default_PCI_trigger(idx)	(1)
 #define default_PCI_polarity(idx)	(1)
 
-/* MCA interrupts are always polarity zero level triggered,
- * when listed as conforming in the MP table. */
-
-#define default_MCA_trigger(idx)	(1)
-#define default_MCA_polarity(idx)	default_ISA_polarity(idx)
-
 static int irq_polarity(int idx)
 {
 	int bus = mp_irqs[idx].srcbus;
@@ -975,7 +969,7 @@ static int irq_trigger(int idx)
 				trigger = default_ISA_trigger(idx);
 			else
 				trigger = default_PCI_trigger(idx);
-#if defined(CONFIG_EISA) || defined(CONFIG_MCA)
+#ifdef CONFIG_EISA
 			switch (mp_bus_id_to_type[bus]) {
 				case MP_BUS_ISA: /* ISA pin */
 				{
@@ -992,11 +986,6 @@ static int irq_trigger(int idx)
 					/* set before the switch */
 					break;
 				}
-				case MP_BUS_MCA: /* MCA pin */
-				{
-					trigger = default_MCA_trigger(idx);
-					break;
-				}
 				default:
 				{
 					printk(KERN_WARNING "broken BIOS!!\n");
diff --git a/arch/x86/kernel/mca_32.c b/arch/x86/kernel/mca_32.c
deleted file mode 100644
index 7eb1e2b97827..000000000000
--- a/arch/x86/kernel/mca_32.c
+++ /dev/null
@@ -1,476 +0,0 @@
-/*
- *  Written by Martin Kolinek, February 1996
- *
- * Changes:
- *
- *	Chris Beauregard July 28th, 1996
- *	- Fixed up integrated SCSI detection
- *
- *	Chris Beauregard August 3rd, 1996
- *	- Made mca_info local
- *	- Made integrated registers accessible through standard function calls
- *	- Added name field
- *	- More sanity checking
- *
- *	Chris Beauregard August 9th, 1996
- *	- Rewrote /proc/mca
- *
- *	Chris Beauregard January 7th, 1997
- *	- Added basic NMI-processing
- *	- Added more information to mca_info structure
- *
- *	David Weinehall October 12th, 1998
- *	- Made a lot of cleaning up in the source
- *	- Added use of save_flags / restore_flags
- *	- Added the 'driver_loaded' flag in MCA_adapter
- *	- Added an alternative implemention of ZP Gu's mca_find_unused_adapter
- *
- *	David Weinehall March 24th, 1999
- *	- Fixed the output of 'Driver Installed' in /proc/mca/pos
- *	- Made the Integrated Video & SCSI show up even if they have id 0000
- *
- *	Alexander Viro November 9th, 1999
- *	- Switched to regular procfs methods
- *
- *	Alfred Arnold & David Weinehall August 23rd, 2000
- *	- Added support for Planar POS-registers
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/mca.h>
-#include <linux/kprobes.h>
-#include <linux/slab.h>
-#include <asm/io.h>
-#include <linux/proc_fs.h>
-#include <linux/mman.h>
-#include <linux/mm.h>
-#include <linux/pagemap.h>
-#include <linux/ioport.h>
-#include <asm/uaccess.h>
-#include <linux/init.h>
-
-static unsigned char which_scsi;
-
-int MCA_bus;
-EXPORT_SYMBOL(MCA_bus);
-
-/*
- * Motherboard register spinlock. Untested on SMP at the moment, but
- * are there any MCA SMP boxes?
- *
- * Yes - Alan
- */
-static DEFINE_SPINLOCK(mca_lock);
-
-/* Build the status info for the adapter */
-
-static void mca_configure_adapter_status(struct mca_device *mca_dev)
-{
-	mca_dev->status = MCA_ADAPTER_NONE;
-
-	mca_dev->pos_id = mca_dev->pos[0]
-		+ (mca_dev->pos[1] << 8);
-
-	if (!mca_dev->pos_id && mca_dev->slot < MCA_MAX_SLOT_NR) {
-
-		/*
-		 * id = 0x0000 usually indicates hardware failure,
-		 * however, ZP Gu (zpg@castle.net> reports that his 9556
-		 * has 0x0000 as id and everything still works. There
-		 * also seem to be an adapter with id = 0x0000; the
-		 * NCR Parallel Bus Memory Card. Until this is confirmed,
-		 * however, this code will stay.
-		 */
-
-		mca_dev->status = MCA_ADAPTER_ERROR;
-
-		return;
-	} else if (mca_dev->pos_id != 0xffff) {
-
-		/*
-		 * 0xffff usually indicates that there's no adapter,
-		 * however, some integrated adapters may have 0xffff as
-		 * their id and still be valid. Examples are on-board
-		 * VGA of the 55sx, the integrated SCSI of the 56 & 57,
-		 * and possibly also the 95 ULTIMEDIA.
-		 */
-
-		mca_dev->status = MCA_ADAPTER_NORMAL;
-	}
-
-	if ((mca_dev->pos_id == 0xffff ||
-	    mca_dev->pos_id == 0x0000) && mca_dev->slot >= MCA_MAX_SLOT_NR) {
-		int j;
-
-		for (j = 2; j < 8; j++) {
-			if (mca_dev->pos[j] != 0xff) {
-				mca_dev->status = MCA_ADAPTER_NORMAL;
-				break;
-			}
-		}
-	}
-
-	if (!(mca_dev->pos[2] & MCA_ENABLED)) {
-
-		/* enabled bit is in POS 2 */
-
-		mca_dev->status = MCA_ADAPTER_DISABLED;
-	}
-} /* mca_configure_adapter_status */
-
-/*--------------------------------------------------------------------*/
-
-static struct resource mca_standard_resources[] = {
-	{ .start = 0x60, .end = 0x60, .name = "system control port B (MCA)" },
-	{ .start = 0x90, .end = 0x90, .name = "arbitration (MCA)" },
-	{ .start = 0x91, .end = 0x91, .name = "card Select Feedback (MCA)" },
-	{ .start = 0x92, .end = 0x92, .name = "system Control port A (MCA)" },
-	{ .start = 0x94, .end = 0x94, .name = "system board setup (MCA)" },
-	{ .start = 0x96, .end = 0x97, .name = "POS (MCA)" },
-	{ .start = 0x100, .end = 0x107, .name = "POS (MCA)" }
-};
-
-#define MCA_STANDARD_RESOURCES	ARRAY_SIZE(mca_standard_resources)
-
-/*
- *	mca_read_and_store_pos - read the POS registers into a memory buffer
- *      @pos: a char pointer to 8 bytes, contains the POS register value on
- *            successful return
- *
- *	Returns 1 if a card actually exists (i.e. the pos isn't
- *	all 0xff) or 0 otherwise
- */
-static int mca_read_and_store_pos(unsigned char *pos)
-{
-	int j;
-	int found = 0;
-
-	for (j = 0; j < 8; j++) {
-		pos[j] = inb_p(MCA_POS_REG(j));
-		if (pos[j] != 0xff) {
-			/* 0xff all across means no device. 0x00 means
-			 * something's broken, but a device is
-			 * probably there.  However, if you get 0x00
-			 * from a motherboard register it won't matter
-			 * what we find.  For the record, on the
-			 * 57SLC, the integrated SCSI adapter has
-			 * 0xffff for the adapter ID, but nonzero for
-			 * other registers.  */
-
-			found = 1;
-		}
-	}
-	return found;
-}
-
-static unsigned char mca_pc_read_pos(struct mca_device *mca_dev, int reg)
-{
-	unsigned char byte;
-	unsigned long flags;
-
-	if (reg < 0 || reg >= 8)
-		return 0;
-
-	spin_lock_irqsave(&mca_lock, flags);
-	if (mca_dev->pos_register) {
-		/* Disable adapter setup, enable motherboard setup */
-
-		outb_p(0, MCA_ADAPTER_SETUP_REG);
-		outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
-
-		byte = inb_p(MCA_POS_REG(reg));
-		outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
-	} else {
-
-		/* Make sure motherboard setup is off */
-
-		outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
-
-		/* Read the appropriate register */
-
-		outb_p(0x8|(mca_dev->slot & 0xf), MCA_ADAPTER_SETUP_REG);
-		byte = inb_p(MCA_POS_REG(reg));
-		outb_p(0, MCA_ADAPTER_SETUP_REG);
-	}
-	spin_unlock_irqrestore(&mca_lock, flags);
-
-	mca_dev->pos[reg] = byte;
-
-	return byte;
-}
-
-static void mca_pc_write_pos(struct mca_device *mca_dev, int reg,
-			     unsigned char byte)
-{
-	unsigned long flags;
-
-	if (reg < 0 || reg >= 8)
-		return;
-
-	spin_lock_irqsave(&mca_lock, flags);
-
-	/* Make sure motherboard setup is off */
-
-	outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
-
-	/* Read in the appropriate register */
-
-	outb_p(0x8|(mca_dev->slot&0xf), MCA_ADAPTER_SETUP_REG);
-	outb_p(byte, MCA_POS_REG(reg));
-	outb_p(0, MCA_ADAPTER_SETUP_REG);
-
-	spin_unlock_irqrestore(&mca_lock, flags);
-
-	/* Update the global register list, while we have the byte */
-
-	mca_dev->pos[reg] = byte;
-
-}
-
-/* for the primary MCA bus, we have identity transforms */
-static int mca_dummy_transform_irq(struct mca_device *mca_dev, int irq)
-{
-	return irq;
-}
-
-static int mca_dummy_transform_ioport(struct mca_device *mca_dev, int port)
-{
-	return port;
-}
-
-static void *mca_dummy_transform_memory(struct mca_device *mca_dev, void *mem)
-{
-	return mem;
-}
-
-
-static int __init mca_init(void)
-{
-	unsigned int i, j;
-	struct mca_device *mca_dev;
-	unsigned char pos[8];
-	short mca_builtin_scsi_ports[] = {0xf7, 0xfd, 0x00};
-	struct mca_bus *bus;
-
-	/*
-	 * WARNING: Be careful when making changes here. Putting an adapter
-	 * and the motherboard simultaneously into setup mode may result in
-	 * damage to chips (according to The Indispensable PC Hardware Book
-	 * by Hans-Peter Messmer). Also, we disable system interrupts (so
-	 * that we are not disturbed in the middle of this).
-	 */
-
-	/* Make sure the MCA bus is present */
-
-	if (mca_system_init()) {
-		printk(KERN_ERR "MCA bus system initialisation failed\n");
-		return -ENODEV;
-	}
-
-	if (!MCA_bus)
-		return -ENODEV;
-
-	printk(KERN_INFO "Micro Channel bus detected.\n");
-
-	/* All MCA systems have at least a primary bus */
-	bus = mca_attach_bus(MCA_PRIMARY_BUS);
-	if (!bus)
-		goto out_nomem;
-	bus->default_dma_mask = 0xffffffffLL;
-	bus->f.mca_write_pos = mca_pc_write_pos;
-	bus->f.mca_read_pos = mca_pc_read_pos;
-	bus->f.mca_transform_irq = mca_dummy_transform_irq;
-	bus->f.mca_transform_ioport = mca_dummy_transform_ioport;
-	bus->f.mca_transform_memory = mca_dummy_transform_memory;
-
-	/* get the motherboard device */
-	mca_dev = kzalloc(sizeof(struct mca_device), GFP_KERNEL);
-	if (unlikely(!mca_dev))
-		goto out_nomem;
-
-	/*
-	 * We do not expect many MCA interrupts during initialization,
-	 * but let us be safe:
-	 */
-	spin_lock_irq(&mca_lock);
-
-	/* Make sure adapter setup is off */
-
-	outb_p(0, MCA_ADAPTER_SETUP_REG);
-
-	/* Read motherboard POS registers */
-
-	mca_dev->pos_register = 0x7f;
-	outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
-	mca_dev->name[0] = 0;
-	mca_read_and_store_pos(mca_dev->pos);
-	mca_configure_adapter_status(mca_dev);
-	/* fake POS and slot for a motherboard */
-	mca_dev->pos_id = MCA_MOTHERBOARD_POS;
-	mca_dev->slot = MCA_MOTHERBOARD;
-	mca_register_device(MCA_PRIMARY_BUS, mca_dev);
-
-	mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
-	if (unlikely(!mca_dev))
-		goto out_unlock_nomem;
-
-	/* Put motherboard into video setup mode, read integrated video
-	 * POS registers, and turn motherboard setup off.
-	 */
-
-	mca_dev->pos_register = 0xdf;
-	outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
-	mca_dev->name[0] = 0;
-	mca_read_and_store_pos(mca_dev->pos);
-	mca_configure_adapter_status(mca_dev);
-	/* fake POS and slot for the integrated video */
-	mca_dev->pos_id = MCA_INTEGVIDEO_POS;
-	mca_dev->slot = MCA_INTEGVIDEO;
-	mca_register_device(MCA_PRIMARY_BUS, mca_dev);
-
-	/*
-	 * Put motherboard into scsi setup mode, read integrated scsi
-	 * POS registers, and turn motherboard setup off.
-	 *
-	 * It seems there are two possible SCSI registers. Martin says that
-	 * for the 56,57, 0xf7 is the one, but fails on the 76.
-	 * Alfredo (apena@vnet.ibm.com) says
-	 * 0xfd works on his machine. We'll try both of them. I figure it's
-	 * a good bet that only one could be valid at a time. This could
-	 * screw up though if one is used for something else on the other
-	 * machine.
-	 */
-
-	for (i = 0; (which_scsi = mca_builtin_scsi_ports[i]) != 0; i++) {
-		outb_p(which_scsi, MCA_MOTHERBOARD_SETUP_REG);
-		if (mca_read_and_store_pos(pos))
-			break;
-	}
-	if (which_scsi) {
-		/* found a scsi card */
-		mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
-		if (unlikely(!mca_dev))
-			goto out_unlock_nomem;
-
-		for (j = 0; j < 8; j++)
-			mca_dev->pos[j] = pos[j];
-
-		mca_configure_adapter_status(mca_dev);
-		/* fake POS and slot for integrated SCSI controller */
-		mca_dev->pos_id = MCA_INTEGSCSI_POS;
-		mca_dev->slot = MCA_INTEGSCSI;
-		mca_dev->pos_register = which_scsi;
-		mca_register_device(MCA_PRIMARY_BUS, mca_dev);
-	}
-
-	/* Turn off motherboard setup */
-
-	outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
-
-	/*
-	 * Now loop over MCA slots: put each adapter into setup mode, and
-	 * read its POS registers. Then put adapter setup off.
-	 */
-
-	for (i = 0; i < MCA_MAX_SLOT_NR; i++) {
-		outb_p(0x8|(i&0xf), MCA_ADAPTER_SETUP_REG);
-		if (!mca_read_and_store_pos(pos))
-			continue;
-
-		mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
-		if (unlikely(!mca_dev))
-			goto out_unlock_nomem;
-
-		for (j = 0; j < 8; j++)
-			mca_dev->pos[j] = pos[j];
-
-		mca_dev->driver_loaded = 0;
-		mca_dev->slot = i;
-		mca_dev->pos_register = 0;
-		mca_configure_adapter_status(mca_dev);
-		mca_register_device(MCA_PRIMARY_BUS, mca_dev);
-	}
-	outb_p(0, MCA_ADAPTER_SETUP_REG);
-
-	/* Enable interrupts and return memory start */
-	spin_unlock_irq(&mca_lock);
-
-	for (i = 0; i < MCA_STANDARD_RESOURCES; i++)
-		request_resource(&ioport_resource, mca_standard_resources + i);
-
-	mca_do_proc_init();
-
-	return 0;
-
- out_unlock_nomem:
-	spin_unlock_irq(&mca_lock);
- out_nomem:
-	printk(KERN_EMERG "Failed memory allocation in MCA setup!\n");
-	return -ENOMEM;
-}
-
-subsys_initcall(mca_init);
-
-/*--------------------------------------------------------------------*/
-
-static __kprobes void
-mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag)
-{
-	int slot = mca_dev->slot;
-
-	if (slot == MCA_INTEGSCSI) {
-		printk(KERN_CRIT "NMI: caused by MCA integrated SCSI adapter (%s)\n",
-			mca_dev->name);
-	} else if (slot == MCA_INTEGVIDEO) {
-		printk(KERN_CRIT "NMI: caused by MCA integrated video adapter (%s)\n",
-			mca_dev->name);
-	} else if (slot == MCA_MOTHERBOARD) {
-		printk(KERN_CRIT "NMI: caused by motherboard (%s)\n",
-			mca_dev->name);
-	}
-
-	/* More info available in POS 6 and 7? */
-
-	if (check_flag) {
-		unsigned char pos6, pos7;
-
-		pos6 = mca_device_read_pos(mca_dev, 6);
-		pos7 = mca_device_read_pos(mca_dev, 7);
-
-		printk(KERN_CRIT "NMI: POS 6 = 0x%x, POS 7 = 0x%x\n", pos6, pos7);
-	}
-
-} /* mca_handle_nmi_slot */
-
-/*--------------------------------------------------------------------*/
-
-static int __kprobes mca_handle_nmi_callback(struct device *dev, void *data)
-{
-	struct mca_device *mca_dev = to_mca_device(dev);
-	unsigned char pos5;
-
-	pos5 = mca_device_read_pos(mca_dev, 5);
-
-	if (!(pos5 & 0x80)) {
-		/*
-		 *  Bit 7 of POS 5 is reset when this adapter has a hardware
-		 * error. Bit 7 it reset if there's error information
-		 * available in POS 6 and 7.
-		 */
-		mca_handle_nmi_device(mca_dev, !(pos5 & 0x40));
-		return 1;
-	}
-	return 0;
-}
-
-void __kprobes mca_handle_nmi(void)
-{
-	/*
-	 *  First try - scan the various adapters and see if a specific
-	 * adapter was responsible for the error.
-	 */
-	bus_for_each_dev(&mca_bus_type, NULL, NULL, mca_handle_nmi_callback);
-}
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index ca470e4c92dc..b02d4dd6b8a3 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -97,7 +97,7 @@ static void __init MP_bus_info(struct mpc_bus *m)
 
 	set_bit(m->busid, mp_bus_not_pci);
 	if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
-#if defined(CONFIG_EISA) || defined(CONFIG_MCA)
+#ifdef CONFIG_EISA
 		mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
 #endif
 	} else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
@@ -105,12 +105,10 @@ static void __init MP_bus_info(struct mpc_bus *m)
 			x86_init.mpparse.mpc_oem_pci_bus(m);
 
 		clear_bit(m->busid, mp_bus_not_pci);
-#if defined(CONFIG_EISA) || defined(CONFIG_MCA)
+#ifdef CONFIG_EISA
 		mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
 	} else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
 		mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
-	} else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
-		mp_bus_id_to_type[m->busid] = MP_BUS_MCA;
 #endif
 	} else
 		printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
@@ -368,9 +366,6 @@ static void __init construct_ioapic_table(int mpc_default_type)
 	case 3:
 		memcpy(bus.bustype, "EISA  ", 6);
 		break;
-	case 4:
-	case 7:
-		memcpy(bus.bustype, "MCA   ", 6);
 	}
 	MP_bus_info(&bus);
 	if (mpc_default_type > 4) {
@@ -623,7 +618,7 @@ void __init default_find_smp_config(void)
 		return;
 	/*
 	 * If it is an SMP machine we should know now, unless the
-	 * configuration is in an EISA/MCA bus machine with an
+	 * configuration is in an EISA bus machine with an
 	 * extended bios data area.
 	 *
 	 * there is a real-mode segmented pointer pointing to the
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index 47acaf319165..7b3fdfdabf94 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -19,8 +19,6 @@
 #include <linux/slab.h>
 #include <linux/export.h>
 
-#include <linux/mca.h>
-
 #if defined(CONFIG_EDAC)
 #include <linux/edac.h>
 #endif
@@ -282,16 +280,6 @@ unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
 
 	__this_cpu_add(nmi_stats.unknown, 1);
 
-#ifdef CONFIG_MCA
-	/*
-	 * Might actually be able to figure out what the guilty party
-	 * is:
-	 */
-	if (MCA_bus) {
-		mca_handle_nmi();
-		return;
-	}
-#endif
 	pr_emerg("Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
 		 reason, smp_processor_id());
 
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 1a2901562059..879166402bf9 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -34,7 +34,6 @@
 #include <linux/memblock.h>
 #include <linux/seq_file.h>
 #include <linux/console.h>
-#include <linux/mca.h>
 #include <linux/root_dev.h>
 #include <linux/highmem.h>
 #include <linux/module.h>
@@ -179,12 +178,6 @@ struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 /* common cpu data for all cpus */
 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 EXPORT_SYMBOL(boot_cpu_data);
-static void set_mca_bus(int x)
-{
-#ifdef CONFIG_MCA
-	MCA_bus = x;
-#endif
-}
 
 unsigned int def_to_bigsmp;
 
@@ -717,7 +710,6 @@ void __init setup_arch(char **cmdline_p)
 	apm_info.bios = boot_params.apm_bios_info;
 	ist_info = boot_params.ist_info;
 	if (boot_params.sys_desc_table.length != 0) {
-		set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 		machine_id = boot_params.sys_desc_table.table[0];
 		machine_submodel_id = boot_params.sys_desc_table.table[1];
 		BIOS_revision = boot_params.sys_desc_table.table[2];
diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
index c6eba2b42673..24d3c91e9812 100644
--- a/arch/x86/kernel/time.c
+++ b/arch/x86/kernel/time.c
@@ -14,7 +14,6 @@
 #include <linux/i8253.h>
 #include <linux/time.h>
 #include <linux/export.h>
-#include <linux/mca.h>
 
 #include <asm/vsyscall.h>
 #include <asm/x86_init.h>
@@ -58,11 +57,6 @@ EXPORT_SYMBOL(profile_pc);
 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 {
 	global_clock_event->event_handler(global_clock_event);
-
-	/* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
-	if (MCA_bus)
-		outb_p(inb_p(0x61)| 0x80, 0x61);
-
 	return IRQ_HANDLED;
 }
 
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index ff9281f16029..4754f510b360 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -37,10 +37,6 @@
 #include <linux/eisa.h>
 #endif
 
-#ifdef CONFIG_MCA
-#include <linux/mca.h>
-#endif
-
 #if defined(CONFIG_EDAC)
 #include <linux/edac.h>
 #endif