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lm-sensors/prog/hotplug/m7101.c
Mark D. Studebaker af51f14cb8 move a couple of lines around 
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1045 7894878c-1315-0410-8ee3-d5d059ff63e0
2001-03-24 18:35:13 +00:00

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/*
* m7101.c
*
* Initialize the M7101 device on ALi M15x3 Chipsets
*/
/*
Copyright (c) 2000 Burkhard Kohl <buk@buks.ipn.de>,
Frank Bauer <frank.bauer@nikocity.de>, and
Mark D. Studebaker <mdsxyz123@yahoo.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* CHANGES:
* 030799 FB: created this file
* frank.bauer@nikocity.de
*
* 110799 BK: messed it up to insert the M7101 dev after boot
* buk@buks.ipn.de
*
* 160799 BK: grouped portions of the code into functions
*
* June 21, 2000 MDS: Add Copyright and GPL comments,
* distribute as release 0.1.
*
* Sept 21, 2000 MDS: Rewrite to use kernel hotplug facility,
* (similar to drivers/pcmcia/cardbus.c),
* fix makefile so it will compile,
* distribute as release 0.2.
*
* This code is absolutely experimental - use it at your own
* risk.
*
* Warning, this module will work only with 2.4.x kernels.
* If it works with earlier kernels then it is by luck.
*
* Warning, this module does not work with egcs < 2.95.2, use
* gcc > 2.7.2 or egcs >= 2.95.2.
*
*/
#ifdef M7101_DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif
#ifndef TRUE
#define TRUE 1
#define FALSE !TRUE
#endif
#include <linux/config.h>
#ifndef CONFIG_HOTPLUG
#error ERROR - You must have 'Support for hot-pluggable devices' enabled in your kernel (under 'general setup')!!
#endif
/* Deal with CONFIG_MODVERSIONS */
#ifdef CONFIG_MODVERSIONS
#define MODVERSIONS
#include <linux/modversions.h>
#endif
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/malloc.h>
#include <asm/types.h>
/*
from lm_sensors-2.3.3:
*/
#define SMBHSTCFG 0x0E0
/* PCI Address Constants */
#define SMBATPC 0x05B /* used to unlock xxxBA registers */
/* ALI15X3 address lock bits */
#define ALI15X3_LOCK 0x06
/*
addresses the i/o space gets mapped to,
for M1543C, Bits 16-31 are supposed to be zero
*/
#define ACPI_IO_SIZE 0x40
#define SMB_IO_SIZE 0x20
#define ACPI_BASE 0x0
#define SMB_BASE 0x1
static u32 acpi_io = 0xEC00; /* Set I/O Base defaults here */
static u32 smb_io = 0xE800;
MODULE_PARM(acpi_io, "l");
MODULE_PARM(smb_io, "l");
#ifdef M7101_DEBUG
static int debug = 0;
MODULE_PARM(debug, "i");
#endif
/* status, used to indicate that io space needs to be freed */
static struct pci_dev *m7101 = NULL;
static int m7101_inserted = FALSE;
extern void cleanup_module();
static rwlock_t m7101_lock = RW_LOCK_UNLOCKED;
static unsigned long m7101_lock_flags = 0;
#ifdef M7101_DEBUG
static void
dump_dev_data(struct pci_dev *dev, int address_data)
{
if (dev != NULL) {
printk("m7101: devfn: 0x%4x class: 0x%4x\n",
dev->devfn, dev->class);
printk("m7101: vendor: 0x%4x device: 0x%4x\n",
dev->vendor, dev->device);
if (address_data) {
printk("m7101: resource[0]: 0x%08lx resource[1]: 0x%08lx\n",
dev->resource[0].start, dev->resource[1].start);
printk("m7101: resource[2]: 0x%08lx resource[3]: 0x%08lx\n",
dev->resource[2].start, dev->resource[3].start);
printk("m7101: resource[4]: 0x%08lx resource[5]: 0x%08lx\n",
dev->resource[4].start, dev->resource[5].start);
printk("m7101: rom_address: 0x%08lx \n",
dev->resource[PCI_ROM_RESOURCE].start);
}
}
}
#endif
/*
* Checks whether PMU and SMB are enabled and turns them on in case they are not.
* It's done by clearing Bit 2 in M1533 config space 5Fh.
* I/O
*/
static int
m7101_enable(struct pci_dev *dev){
u8 val = 0;
pci_read_config_byte(dev, 0x5F, &val);
DBG("m7101: M7101 config byte reading 0x%X.\n", val);
if (val & 0x4) {
pci_write_config_byte(dev, 0x5F, val & 0xFB);
pci_read_config_byte(dev, 0x5F, &val);
if(val & 0x4) {
DBG("m7101: Can't enable PMU/SMB, config byte locked:-(\n");
return -EIO;
}
}
return 0;
}
/*
* Builds the basic pci_dev for the M7101
*/
static int
m7101_build(struct pci_dev **m7101, struct pci_bus *bus)
{
u32 devfn;
u16 id = 0;
u16 vid = 0;
int ret;
DBG("m7101: requesting kernel space for the m7101 entry.\n");
*m7101 = kmalloc(sizeof(**m7101), GFP_ATOMIC);
if(NULL == *m7101) {
printk("m7101: out of memory.\n");
return -ENOMEM;
}
/* minimally fill in structure for search */
/* The device should be on the same bus as the M1533. */
memset(*m7101, 0, sizeof(**m7101));
(*m7101)->bus = bus;
(*m7101)->sysdata = bus->sysdata;
(*m7101)->hdr_type = PCI_HEADER_TYPE_NORMAL;
DBG("m7101: now looking for M7101.\n");
for (id = 0, devfn = 0; devfn < 0xFF; devfn++) {
(*m7101)->devfn = devfn;
ret = pci_read_config_word(*m7101, PCI_DEVICE_ID, &id);
if (ret == 0 && PCI_DEVICE_ID_AL_M7101 == id) {
pci_read_config_word(*m7101, PCI_VENDOR_ID, &vid);
if(vid == PCI_VENDOR_ID_AL)
break;
}
}
if (PCI_DEVICE_ID_AL_M7101 != id) {
DBG("m7101: M7101 not found although M1533 present - strange.\n");
return -EACCES;
} else {
DBG("m7101: M7101 found and enabled. Devfn: 0x%X.\n", devfn);
}
/* We now have the devfn and bus of the M7101 device.
* let's put the rest of the device data together.
*/
(*m7101)->vendor = PCI_VENDOR_ID_AL;
(*m7101)->hdr_type = PCI_HEADER_TYPE_NORMAL;
(*m7101)->device = PCI_DEVICE_ID_AL_M7101;
return(pci_setup_device(*m7101));
}
/*
* unlock the address registers if necessary
*/
static int
m7101_unlock_registers(struct pci_dev *m7101)
{
u8 val = 0;
if (pci_read_config_byte(m7101, SMBATPC, &val)) {
DBG("m7101: failed to read SMBATPC\n");
return -EIO;
} else {
if(val & ALI15X3_LOCK) {
DBG("m7101: need to unlock the address registers\n");
val &= ~ALI15X3_LOCK;
if (pci_write_config_byte(m7101, SMBATPC, val)) {
DBG("m7101: failed to write SMBATPC\n");
return -EIO;
}
}
}
return 0;
}
static int
m7101_set_io_address(struct pci_dev *m7101, u32 addr, int base_idx, int size)
{
if (!addr) {
printk("m7101: Sorry - cannot assign address 0 to region.\n");
return -EINVAL;
}
if (check_region(addr, size)) {
printk("m7101: Requested IO-region 0x%x already in use.\n", addr);
return -EBUSY;
} else {
m7101->resource[base_idx].start = addr;
}
return 0;
}
/* Initialize the module */
int init_module(void)
{
struct pci_bus *bus = NULL;
struct pci_dev *dev = NULL;
u32 acpi_addr = 0, smb_addr = 0;
int ret = 0;
DBG("m7101: init_module().\n");
/* Are we on a PCI-Board? */
if (!pci_present()) {
printk("m7101: No PCI bus found - sorry.\n");
return -ENODEV;
}
/* We want to be sure that the M7101 is not present yet. */
dev = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL);
if (dev) {
printk("m7101: M7101 already present, no need to run this module.\n");
#ifdef M7101_DEBUG
if(debug)
{
printk("m7101: removing device for testing\n");
pci_remove_device(dev);
m7101_inserted = 0;
return 0;
}
else
#endif
return -EPERM;
}
/* Are we operating a M15x3 chipset */
dev = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
if (NULL == dev) {
printk("m7101: ALi M15xx chipset not found.\n");
return -ENODEV ;
}
/* we need the bus pointer later */
bus = dev->bus;
if ( (ret = m7101_enable(dev)) ) {
printk("m7101: Unable to turn on M7101 device - sorry!\n");
return ret;
}
if ( (ret = m7101_build(&m7101, bus)) ){
return ret;
}
/* thus, now we have a rudimentary dev for M7101 ... */
/* check wether register need to be unlocked. */
if ( (ret = m7101_unlock_registers(m7101)) ){
return ret;
}
/*
* Handle address assignment for ACPI_IO
* If address is already assigned do nothing.
*/
acpi_addr = m7101->resource[ACPI_BASE].start;
if (!acpi_addr) {
acpi_io |= PCI_BASE_ADDRESS_SPACE_IO;
ret = m7101_set_io_address(m7101, acpi_io,ACPI_BASE, ACPI_IO_SIZE);
if (ret)
return ret;
acpi_addr = acpi_io;
}
/*
* Handle address assignment for SMB_IO
* If address is already assigned then do nothing.
*/
smb_addr = m7101->resource[SMB_BASE].start;
if (!smb_addr) {
smb_io |= PCI_BASE_ADDRESS_SPACE_IO;
ret = m7101_set_io_address(m7101, smb_io, SMB_BASE, SMB_IO_SIZE);
if (ret)
return ret;
smb_addr = smb_io;
}
#ifdef M7101_DEBUG
dump_dev_data(m7101, 1);
#endif
if ( (ret = pci_enable_device(m7101)) ) {
printk("m7101: Unable to pci_enable M7101 device!\n");
return ret;
}
DBG("m7101: now inserting.\n");
pci_insert_device(m7101, m7101->bus);
printk("m7101: Enabled with ACPI I/O address 0x%04X and SMB I/O address 0x%04X\n",
acpi_addr, smb_addr);
m7101_inserted = TRUE;
return 0;
}
void cleanup_module()
{
write_lock_irqsave(m7101_lock, m7101_lock_flags);
if (m7101_inserted) {
pci_remove_device(m7101);
m7101_inserted = FALSE;
}
write_unlock_irqrestore(m7101_lock, m7101_lock_flags);
if (NULL != m7101)
kfree(m7101);
printk("m7101: bye bye\n");
}
EXPORT_NO_SYMBOLS;
#ifdef MODULE
MODULE_AUTHOR("Burkhard Kohl <bku@buks.ipn.de>, "
"Frank Bauer <frank.bauer@nikocity.de>, "
"and Mark Studebaker <mdsxyz123@yahoo.com>");
MODULE_DESCRIPTION("M7101 PCI Inserter");
#endif /* MODULE */
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