linux-sg2042/arch/x86/kernel/mca_32.c

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/*
* 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
#include <asm/system.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);
}