476 lines
13 KiB
C
476 lines
13 KiB
C
/*
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* linux/arch/i386/kernel/mca.c
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* Written by Martin Kolinek, February 1996
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*
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* Changes:
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*
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* Chris Beauregard July 28th, 1996
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* - Fixed up integrated SCSI detection
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*
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* Chris Beauregard August 3rd, 1996
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* - Made mca_info local
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* - Made integrated registers accessible through standard function calls
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* - Added name field
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* - More sanity checking
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*
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* Chris Beauregard August 9th, 1996
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* - Rewrote /proc/mca
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*
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* Chris Beauregard January 7th, 1997
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* - Added basic NMI-processing
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* - Added more information to mca_info structure
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*
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* David Weinehall October 12th, 1998
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* - Made a lot of cleaning up in the source
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* - Added use of save_flags / restore_flags
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* - Added the 'driver_loaded' flag in MCA_adapter
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* - Added an alternative implemention of ZP Gu's mca_find_unused_adapter
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*
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* David Weinehall March 24th, 1999
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* - Fixed the output of 'Driver Installed' in /proc/mca/pos
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* - Made the Integrated Video & SCSI show up even if they have id 0000
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*
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* Alexander Viro November 9th, 1999
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* - Switched to regular procfs methods
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*
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* Alfred Arnold & David Weinehall August 23rd, 2000
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* - Added support for Planar POS-registers
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/mca.h>
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#include <linux/kprobes.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <linux/proc_fs.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/ioport.h>
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#include <asm/uaccess.h>
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#include <linux/init.h>
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#include <asm/arch_hooks.h>
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static unsigned char which_scsi = 0;
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int MCA_bus = 0;
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EXPORT_SYMBOL(MCA_bus);
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/*
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* Motherboard register spinlock. Untested on SMP at the moment, but
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* are there any MCA SMP boxes?
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*
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* Yes - Alan
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*/
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static DEFINE_SPINLOCK(mca_lock);
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/* Build the status info for the adapter */
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static void mca_configure_adapter_status(struct mca_device *mca_dev) {
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mca_dev->status = MCA_ADAPTER_NONE;
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mca_dev->pos_id = mca_dev->pos[0]
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+ (mca_dev->pos[1] << 8);
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if(!mca_dev->pos_id && mca_dev->slot < MCA_MAX_SLOT_NR) {
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/* id = 0x0000 usually indicates hardware failure,
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* however, ZP Gu (zpg@castle.net> reports that his 9556
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* has 0x0000 as id and everything still works. There
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* also seem to be an adapter with id = 0x0000; the
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* NCR Parallel Bus Memory Card. Until this is confirmed,
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* however, this code will stay.
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*/
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mca_dev->status = MCA_ADAPTER_ERROR;
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return;
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} else if(mca_dev->pos_id != 0xffff) {
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/* 0xffff usually indicates that there's no adapter,
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* however, some integrated adapters may have 0xffff as
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* their id and still be valid. Examples are on-board
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* VGA of the 55sx, the integrated SCSI of the 56 & 57,
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* and possibly also the 95 ULTIMEDIA.
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*/
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mca_dev->status = MCA_ADAPTER_NORMAL;
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}
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if((mca_dev->pos_id == 0xffff ||
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mca_dev->pos_id == 0x0000) && mca_dev->slot >= MCA_MAX_SLOT_NR) {
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int j;
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for(j = 2; j < 8; j++) {
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if(mca_dev->pos[j] != 0xff) {
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mca_dev->status = MCA_ADAPTER_NORMAL;
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break;
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}
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}
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}
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if(!(mca_dev->pos[2] & MCA_ENABLED)) {
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/* enabled bit is in POS 2 */
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mca_dev->status = MCA_ADAPTER_DISABLED;
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}
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} /* mca_configure_adapter_status */
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/*--------------------------------------------------------------------*/
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static struct resource mca_standard_resources[] = {
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{ .start = 0x60, .end = 0x60, .name = "system control port B (MCA)" },
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{ .start = 0x90, .end = 0x90, .name = "arbitration (MCA)" },
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{ .start = 0x91, .end = 0x91, .name = "card Select Feedback (MCA)" },
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{ .start = 0x92, .end = 0x92, .name = "system Control port A (MCA)" },
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{ .start = 0x94, .end = 0x94, .name = "system board setup (MCA)" },
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{ .start = 0x96, .end = 0x97, .name = "POS (MCA)" },
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{ .start = 0x100, .end = 0x107, .name = "POS (MCA)" }
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};
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#define MCA_STANDARD_RESOURCES ARRAY_SIZE(mca_standard_resources)
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/**
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* mca_read_and_store_pos - read the POS registers into a memory buffer
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* @pos: a char pointer to 8 bytes, contains the POS register value on
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* successful return
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*
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* Returns 1 if a card actually exists (i.e. the pos isn't
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* all 0xff) or 0 otherwise
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*/
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static int mca_read_and_store_pos(unsigned char *pos) {
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int j;
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int found = 0;
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for(j=0; j<8; j++) {
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if((pos[j] = inb_p(MCA_POS_REG(j))) != 0xff) {
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/* 0xff all across means no device. 0x00 means
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* something's broken, but a device is
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* probably there. However, if you get 0x00
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* from a motherboard register it won't matter
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* what we find. For the record, on the
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* 57SLC, the integrated SCSI adapter has
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* 0xffff for the adapter ID, but nonzero for
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* other registers. */
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found = 1;
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}
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}
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return found;
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}
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static unsigned char mca_pc_read_pos(struct mca_device *mca_dev, int reg)
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{
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unsigned char byte;
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unsigned long flags;
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if(reg < 0 || reg >= 8)
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return 0;
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spin_lock_irqsave(&mca_lock, flags);
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if(mca_dev->pos_register) {
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/* Disable adapter setup, enable motherboard setup */
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outb_p(0, MCA_ADAPTER_SETUP_REG);
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outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
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byte = inb_p(MCA_POS_REG(reg));
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outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
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} else {
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/* Make sure motherboard setup is off */
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outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
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/* Read the appropriate register */
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outb_p(0x8|(mca_dev->slot & 0xf), MCA_ADAPTER_SETUP_REG);
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byte = inb_p(MCA_POS_REG(reg));
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outb_p(0, MCA_ADAPTER_SETUP_REG);
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}
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spin_unlock_irqrestore(&mca_lock, flags);
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mca_dev->pos[reg] = byte;
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return byte;
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}
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static void mca_pc_write_pos(struct mca_device *mca_dev, int reg,
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unsigned char byte)
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{
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unsigned long flags;
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if(reg < 0 || reg >= 8)
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return;
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spin_lock_irqsave(&mca_lock, flags);
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/* Make sure motherboard setup is off */
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outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
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/* Read in the appropriate register */
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outb_p(0x8|(mca_dev->slot&0xf), MCA_ADAPTER_SETUP_REG);
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outb_p(byte, MCA_POS_REG(reg));
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outb_p(0, MCA_ADAPTER_SETUP_REG);
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spin_unlock_irqrestore(&mca_lock, flags);
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/* Update the global register list, while we have the byte */
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mca_dev->pos[reg] = byte;
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}
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/* for the primary MCA bus, we have identity transforms */
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static int mca_dummy_transform_irq(struct mca_device * mca_dev, int irq)
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{
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return irq;
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}
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static int mca_dummy_transform_ioport(struct mca_device * mca_dev, int port)
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{
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return port;
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}
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static void *mca_dummy_transform_memory(struct mca_device * mca_dev, void *mem)
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{
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return mem;
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}
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static int __init mca_init(void)
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{
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unsigned int i, j;
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struct mca_device *mca_dev;
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unsigned char pos[8];
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short mca_builtin_scsi_ports[] = {0xf7, 0xfd, 0x00};
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struct mca_bus *bus;
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/* WARNING: Be careful when making changes here. Putting an adapter
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* and the motherboard simultaneously into setup mode may result in
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* damage to chips (according to The Indispensible PC Hardware Book
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* by Hans-Peter Messmer). Also, we disable system interrupts (so
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* that we are not disturbed in the middle of this).
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*/
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/* Make sure the MCA bus is present */
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if (mca_system_init()) {
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printk(KERN_ERR "MCA bus system initialisation failed\n");
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return -ENODEV;
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}
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if (!MCA_bus)
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return -ENODEV;
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printk(KERN_INFO "Micro Channel bus detected.\n");
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/* All MCA systems have at least a primary bus */
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bus = mca_attach_bus(MCA_PRIMARY_BUS);
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if (!bus)
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goto out_nomem;
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bus->default_dma_mask = 0xffffffffLL;
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bus->f.mca_write_pos = mca_pc_write_pos;
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bus->f.mca_read_pos = mca_pc_read_pos;
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bus->f.mca_transform_irq = mca_dummy_transform_irq;
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bus->f.mca_transform_ioport = mca_dummy_transform_ioport;
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bus->f.mca_transform_memory = mca_dummy_transform_memory;
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/* get the motherboard device */
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mca_dev = kmalloc(sizeof(struct mca_device), GFP_KERNEL);
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if(unlikely(!mca_dev))
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goto out_nomem;
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memset(mca_dev, 0, sizeof(struct mca_device));
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/*
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* We do not expect many MCA interrupts during initialization,
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* but let us be safe:
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*/
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spin_lock_irq(&mca_lock);
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/* Make sure adapter setup is off */
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outb_p(0, MCA_ADAPTER_SETUP_REG);
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/* Read motherboard POS registers */
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mca_dev->pos_register = 0x7f;
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outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
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mca_dev->name[0] = 0;
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mca_read_and_store_pos(mca_dev->pos);
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mca_configure_adapter_status(mca_dev);
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/* fake POS and slot for a motherboard */
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mca_dev->pos_id = MCA_MOTHERBOARD_POS;
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mca_dev->slot = MCA_MOTHERBOARD;
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mca_register_device(MCA_PRIMARY_BUS, mca_dev);
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mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC);
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if(unlikely(!mca_dev))
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goto out_unlock_nomem;
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memset(mca_dev, 0, sizeof(struct mca_device));
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/* Put motherboard into video setup mode, read integrated video
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* POS registers, and turn motherboard setup off.
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*/
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mca_dev->pos_register = 0xdf;
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outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
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mca_dev->name[0] = 0;
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mca_read_and_store_pos(mca_dev->pos);
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mca_configure_adapter_status(mca_dev);
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/* fake POS and slot for the integrated video */
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mca_dev->pos_id = MCA_INTEGVIDEO_POS;
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mca_dev->slot = MCA_INTEGVIDEO;
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mca_register_device(MCA_PRIMARY_BUS, mca_dev);
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/* Put motherboard into scsi setup mode, read integrated scsi
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* POS registers, and turn motherboard setup off.
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*
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* It seems there are two possible SCSI registers. Martin says that
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* for the 56,57, 0xf7 is the one, but fails on the 76.
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* Alfredo (apena@vnet.ibm.com) says
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* 0xfd works on his machine. We'll try both of them. I figure it's
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* a good bet that only one could be valid at a time. This could
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* screw up though if one is used for something else on the other
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* machine.
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*/
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for(i = 0; (which_scsi = mca_builtin_scsi_ports[i]) != 0; i++) {
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outb_p(which_scsi, MCA_MOTHERBOARD_SETUP_REG);
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if(mca_read_and_store_pos(pos))
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break;
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}
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if(which_scsi) {
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/* found a scsi card */
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mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC);
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if(unlikely(!mca_dev))
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goto out_unlock_nomem;
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memset(mca_dev, 0, sizeof(struct mca_device));
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for(j = 0; j < 8; j++)
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mca_dev->pos[j] = pos[j];
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mca_configure_adapter_status(mca_dev);
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/* fake POS and slot for integrated SCSI controller */
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mca_dev->pos_id = MCA_INTEGSCSI_POS;
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mca_dev->slot = MCA_INTEGSCSI;
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mca_dev->pos_register = which_scsi;
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mca_register_device(MCA_PRIMARY_BUS, mca_dev);
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}
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/* Turn off motherboard setup */
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outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
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/* Now loop over MCA slots: put each adapter into setup mode, and
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* read its POS registers. Then put adapter setup off.
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*/
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for(i=0; i<MCA_MAX_SLOT_NR; i++) {
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outb_p(0x8|(i&0xf), MCA_ADAPTER_SETUP_REG);
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if(!mca_read_and_store_pos(pos))
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continue;
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mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC);
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if(unlikely(!mca_dev))
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goto out_unlock_nomem;
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memset(mca_dev, 0, sizeof(struct mca_device));
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for(j=0; j<8; j++)
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mca_dev->pos[j]=pos[j];
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mca_dev->driver_loaded = 0;
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mca_dev->slot = i;
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mca_dev->pos_register = 0;
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mca_configure_adapter_status(mca_dev);
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mca_register_device(MCA_PRIMARY_BUS, mca_dev);
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}
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outb_p(0, MCA_ADAPTER_SETUP_REG);
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/* Enable interrupts and return memory start */
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spin_unlock_irq(&mca_lock);
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for (i = 0; i < MCA_STANDARD_RESOURCES; i++)
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request_resource(&ioport_resource, mca_standard_resources + i);
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mca_do_proc_init();
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return 0;
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out_unlock_nomem:
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spin_unlock_irq(&mca_lock);
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out_nomem:
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printk(KERN_EMERG "Failed memory allocation in MCA setup!\n");
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return -ENOMEM;
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}
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subsys_initcall(mca_init);
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/*--------------------------------------------------------------------*/
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static __kprobes void
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mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag)
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{
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int slot = mca_dev->slot;
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if(slot == MCA_INTEGSCSI) {
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printk(KERN_CRIT "NMI: caused by MCA integrated SCSI adapter (%s)\n",
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mca_dev->name);
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} else if(slot == MCA_INTEGVIDEO) {
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printk(KERN_CRIT "NMI: caused by MCA integrated video adapter (%s)\n",
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mca_dev->name);
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} else if(slot == MCA_MOTHERBOARD) {
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printk(KERN_CRIT "NMI: caused by motherboard (%s)\n",
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mca_dev->name);
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}
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/* More info available in POS 6 and 7? */
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if(check_flag) {
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unsigned char pos6, pos7;
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pos6 = mca_device_read_pos(mca_dev, 6);
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pos7 = mca_device_read_pos(mca_dev, 7);
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printk(KERN_CRIT "NMI: POS 6 = 0x%x, POS 7 = 0x%x\n", pos6, pos7);
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}
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} /* mca_handle_nmi_slot */
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/*--------------------------------------------------------------------*/
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static int __kprobes mca_handle_nmi_callback(struct device *dev, void *data)
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{
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struct mca_device *mca_dev = to_mca_device(dev);
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unsigned char pos5;
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pos5 = mca_device_read_pos(mca_dev, 5);
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if(!(pos5 & 0x80)) {
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/* Bit 7 of POS 5 is reset when this adapter has a hardware
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* error. Bit 7 it reset if there's error information
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* available in POS 6 and 7.
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*/
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mca_handle_nmi_device(mca_dev, !(pos5 & 0x40));
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return 1;
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}
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return 0;
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}
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void __kprobes mca_handle_nmi(void)
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{
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/* First try - scan the various adapters and see if a specific
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* adapter was responsible for the error.
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*/
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bus_for_each_dev(&mca_bus_type, NULL, NULL, mca_handle_nmi_callback);
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mca_nmi_hook();
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} /* mca_handle_nmi */
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