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lm-sensors/kernel/busses/i2c-sis630.c
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/*
sis630.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 2002 Alexander Malysh <amalysh@web.de>
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:
24.09.2002
Fixed typo in sis630_access
Fixed logical error by restoring of Host Master Clock
21.09.2002
Added high_clock module option.If this option is set
used Host Master Clock 56KHz (default 14KHz).For now we are save old Host
Master Clock and after transaction completed restore (otherwise
it's confuse BIOS and hung Machine).
18.09.2002
Added SIS730 as supported
24.08.2002
Fixed the typo in sis630_access (Thanks to Mark M. Hoffman)
Changed sis630_transaction. Now it's 2x faster (Thanks to Mark M. Hoffman)
*/
/*
TODO:
Implement block data write/read
Test on 2.2 kernel
*/
/*
Status: beta
Supports:
SIS 630
SIS 730
Note: we assume there can only be one device, with one SMBus interface.
*/
#include <linux/version.h>
#include <linux/module.h>
#include <asm/io.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include "version.h"
#include <linux/init.h>
#ifndef I2C_HW_SMBUS_SIS630
#define I2C_HW_SMBUS_SIS630 0x08
#endif
#ifndef PCI_VENDOR_ID_SI
#define PCI_VENDOR_ID_SI 0x1039
#endif
#ifndef PCI_DEVICE_ID_SI_630
#define PCI_DEVICE_ID_SI_630 0x0630
#endif
#ifndef PCI_DEVICE_ID_SI_730
#define PCI_DEVICE_ID_SI_730 0x0730
#endif
#ifndef PCI_DEVICE_ID_SI_503
#define PCI_DEVICE_ID_SI_503 0x0008
#endif
struct sd {
const unsigned short mfr;
const unsigned short dev;
const unsigned char fn;
const char *name;
};
/* supported chips */
static struct sd supported[] = {
{PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_630, 0, "SIS630"},
{PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_730, 0, "SIS730"},
{0, 0, 0, NULL}
};
/* SIS630 SMBus registers */
#define SMB_STS 0x80 /* status */
#define SMB_EN 0x81 /* status enable */
#define SMB_CNT 0x82
#define SMBHOST_CNT 0x83
#define SMB_ADDR 0x84
#define SMB_CMD 0x85
#define SMB_PCOUNT 0x86 /* processed count */
#define SMB_COUNT 0x87
#define SMB_BYTE 0x88 /* ~0x8F data byte field */
#define SMBDEV_ADDR 0x90
#define SMB_DB0 0x91
#define SMB_DB1 0x92
#define SMB_SAA 0x93
/* register count for request_region */
#define SIS630_SMB_IOREGION 20
/* PCI address constants */
/* acpi base address register */
#define SIS630_ACPI_BASE_REG 0x74
/* bios control register */
#define SIS630_BIOS_CTL_REG 0x40
/* Other settings */
#define MAX_TIMEOUT 500
/* SIS630 constants */
#define SIS630_QUICK 0x00
#define SIS630_BYTE 0x01
#define SIS630_BYTE_DATA 0x02
#define SIS630_WORD_DATA 0x03
#define SIS630_PCALL 0x04
#define SIS630_BLOCK_DATA 0x05
/* insmod parameters */
/* If force is set to anything different from 0, we forcibly enable the
SIS630. DANGEROUS! */
static int force = 0;
static int high_clock = 0;
MODULE_PARM(force, "i");
MODULE_PARM_DESC(force, "Forcibly enable the SIS630. DANGEROUS!");
MODULE_PARM(high_clock, "i");
MODULE_PARM_DESC(high_clock, "Set Host Master Clock to 56KHz (default 14KHz).");
#ifdef MODULE
static
#else
extern
#endif
int __init i2c_sis630_init(void);
static int __init i2c_sis630_cleanup(void);
static int sis630_setup(void);
static s32 sis630_access(struct i2c_adapter *adap, u16 addr,
unsigned short flags, char read_write,
u8 command, int size,
union i2c_smbus_data *data);
static void sis630_do_pause(unsigned int amount);
static int sis630_transaction(int size);
static void sis630_inc(struct i2c_adapter *adapter);
static void sis630_dec(struct i2c_adapter *adapter);
static u32 sis630_func(struct i2c_adapter *adapter);
static u8 sis630_read(u8 reg);
static void sis630_write(u8 reg, u8 data);
static struct i2c_algorithm smbus_algorithm = {
/* name */ "Non-I2C SMBus adapter",
/* id */ I2C_ALGO_SMBUS,
/* master_xfer */ NULL,
/* smbus_access */ sis630_access,
/* slave_send */ NULL,
/* slave_rcv */ NULL,
/* algo_control */ NULL,
/* functionality */ sis630_func,
};
static struct i2c_adapter sis630_adapter = {
"unset",
I2C_ALGO_SMBUS | I2C_HW_SMBUS_SIS630,
&smbus_algorithm,
NULL,
sis630_inc,
sis630_dec,
NULL,
NULL,
};
static unsigned short acpi_base = 0;
static int __initdata sis630_initialized;
u8 sis630_read(u8 reg) {
return inb(acpi_base + reg);
}
void sis630_write(u8 reg, u8 data) {
outb(data, acpi_base + reg);
}
/* Internally used pause function */
void sis630_do_pause(unsigned int amount)
{
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(amount);
}
int sis630_transaction(int size) {
int temp;
int result = 0;
int timeout = 0;
u8 oldclock;
/*
Make sure the SMBus host is ready to start transmitting.
*/
if ((temp = sis630_read(SMB_CNT) & 0x03) != 0x00) {
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: SMBus busy (%02x). "
"Resetting...\n",temp);
#endif
/* kill smbus transaction */
sis630_write(SMBHOST_CNT, 0x20);
if ((temp = sis630_read(SMB_CNT) & 0x03) != 0x00) {
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: Failed! (%02x)\n",
temp);
#endif
return -1;
} else {
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: Successfull!\n");
#endif
}
}
/* save old clock, so we can prevent machine to hung */
oldclock = sis630_read(SMB_CNT);
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: saved clock 0x%02x\n", oldclock);
#endif
/* disable timeout interrupt , set Host Master Clock to 56KHz if requested */
if (high_clock > 0)
sis630_write(SMB_CNT, 0x20);
else
sis630_write(SMB_CNT, 0x00);
/* clear all sticky bits */
temp = sis630_read(SMB_STS);
sis630_write(SMB_STS, temp & 0x1e);
/* start the transaction by setting bit 4 and size */
sis630_write(SMBHOST_CNT,0x10 | (size & 0x07));
/* We will always wait for a fraction of a second! */
do {
sis630_do_pause(1);
temp = sis630_read(SMB_STS);
} while (!(temp & 0x0e) && (timeout++ < MAX_TIMEOUT));
/* If the SMBus is still busy, we give up */
if (timeout >= MAX_TIMEOUT) {
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: SMBus Timeout!\n");
#endif
result = -1;
}
if (temp & 0x02) {
result = -1;
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: Error: Failed bus "
"transaction\n");
#endif
}
if (temp & 0x04) {
result = -1;
printk(KERN_ERR "i2c-sis630.o: Bus collision! "
"SMBus may be locked until next hard reset (or not...)\n");
/*
TBD: Datasheet say:
the software should clear this bit and restart SMBUS operation
*/
}
/* clear all status "sticky" bits */
sis630_write(SMB_STS, temp);
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: SMB_CNT before clock restore 0x%02x\n", sis630_read(SMB_CNT));
#endif
/* restore old Host Master Clock */
switch(oldclock & 0x20) {
case 1:
sis630_write(SMB_CNT, sis630_read(SMB_CNT) | 0x20);
break;
case 0:
oldclock = sis630_read(SMB_CNT) & ~0x20;
sis630_write(SMB_CNT,oldclock);
break;
}
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: SMB_CNT after clock restore 0x%02x\n", sis630_read(SMB_CNT));
#endif
return result;
}
/* Return -1 on error. */
s32 sis630_access(struct i2c_adapter * adap, u16 addr,
unsigned short flags, char read_write,
u8 command, int size, union i2c_smbus_data * data) {
switch (size) {
case I2C_SMBUS_QUICK:
sis630_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
size = SIS630_QUICK;
break;
case I2C_SMBUS_BYTE:
sis630_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
if (read_write == I2C_SMBUS_WRITE)
sis630_write(SMB_CMD, command);
size = SIS630_BYTE;
break;
case I2C_SMBUS_BYTE_DATA:
sis630_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
sis630_write(SMB_CMD, command);
if (read_write == I2C_SMBUS_WRITE)
sis630_write(SMB_BYTE, data->byte);
size = SIS630_BYTE_DATA;
break;
case I2C_SMBUS_PROC_CALL:
case I2C_SMBUS_WORD_DATA:
sis630_write(SMB_ADDR,((addr & 0x7f) << 1) | (read_write & 0x01));
sis630_write(SMB_CMD, command);
if (read_write == I2C_SMBUS_WRITE) {
sis630_write(SMB_BYTE, data->word & 0xff);
sis630_write(SMB_BYTE + 1,(data->word & 0xff00) >> 8);
}
size = (size == I2C_SMBUS_PROC_CALL ? SIS630_PCALL : SIS630_WORD_DATA);
break;
case I2C_SMBUS_BLOCK_DATA:
/* it's not implemented yet, but comming soon */
#if 0
sis630_write(SMB_ADDR,((addr & 0x7f) << 1) | (read_write & 0x01));
sis630_write(SMB_CMD, command);
size = SIS630_BLOCK_DATA;
#endif
default:
printk("Unsupported I2C size\n");
return -1;
break;
}
if (sis630_transaction(size))
return -1;
if ((size != SIS630_PCALL) &&
((read_write == I2C_SMBUS_WRITE) || (size == SIS630_QUICK))) {
return 0;
}
switch(size) {
case SIS630_BYTE:
case SIS630_BYTE_DATA:
data->byte = sis630_read(SMB_BYTE);
break;
case SIS630_PCALL:
case SIS630_WORD_DATA:
data->word = sis630_read(SMB_BYTE) + (sis630_read(SMB_BYTE + 1) << 8);
break;
default:
return -1;
break;
}
return 0;
}
void sis630_inc(struct i2c_adapter *adapter) {
MOD_INC_USE_COUNT;
}
void sis630_dec(struct i2c_adapter *adapter) {
MOD_DEC_USE_COUNT;
}
u32 sis630_func(struct i2c_adapter *adapter) {
return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_PROC_CALL;
}
int sis630_setup(void) {
unsigned char b;
struct pci_dev *sis630_dev = NULL,*tmp = NULL;
struct sd *en = supported;
/* First check whether we can access PCI at all */
if (pci_present() == 0) {
printk("i2c-sis630.o: Error: No PCI-bus found!\n");
return -ENODEV;
}
/* Look for the SIS630 and compatible */
if (!(sis630_dev = pci_find_device(PCI_VENDOR_ID_SI,
PCI_DEVICE_ID_SI_503,
sis630_dev))) {
printk(KERN_ERR "i2c-sis630.o: Error: Can't detect 85C503/5513 ISA bridge!\n");
return -ENODEV;
}
do {
if ((tmp = pci_find_device(en->mfr,en->dev,NULL))) {
if (PCI_FUNC(tmp->devfn) != en->fn)
continue;
break;
}
en++;
}
while(en->mfr);
if (tmp == NULL && force == 0 ) {
printk(KERN_ERR "i2c-sis630.o: Error: Can't detect SIS630 compatible device!\n");
return -ENODEV;
}
else if (tmp == NULL && force > 0) {
printk(KERN_NOTICE "i2c-sis630.o: WARNING: Can't detect SIS630 compatible device, but "
"loading because of force option enabled\n");
}
/*
Enable ACPI first , so we can accsess reg 74-75
in acpi io space and read acpi base addr
*/
if (PCIBIOS_SUCCESSFUL !=
pci_read_config_byte(sis630_dev, SIS630_BIOS_CTL_REG,&b)) {
printk(KERN_ERR "i2c-sis630.o: Error: Can't read bios ctl reg\n");
return -ENODEV;
}
/* if ACPI already anbled , do nothing */
if (!(b & 0x80) &&
PCIBIOS_SUCCESSFUL !=
pci_write_config_byte(sis630_dev,SIS630_BIOS_CTL_REG,b|0x80)) {
printk(KERN_ERR "i2c-sis630.o: Error: Can't enable ACPI\n");
return -ENODEV;
}
/* Determine the ACPI base address */
if (PCIBIOS_SUCCESSFUL !=
pci_read_config_word(sis630_dev,SIS630_ACPI_BASE_REG,&acpi_base)) {
printk(KERN_ERR "i2c-sis630.o: Error: Can't determine ACPI base address\n");
return -ENODEV;
}
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: ACPI base at 0x%04x\n", acpi_base);
#endif
/* Everything is happy, let's grab the memory and set things up. */
if (!request_region(acpi_base + SMB_STS, SIS630_SMB_IOREGION, "sis630-smbus")){
printk(KERN_ERR "i2c-sis630.o: SMBus registers 0x%04x-0x%04x "
"already in use!\n",acpi_base + SMB_STS, acpi_base + SMB_SAA);
return -ENODEV;
}
return 0;
}
int __init i2c_sis630_init(void) {
int res;
printk("i2c-sis630.o version %s (%s)\n", LM_VERSION, LM_DATE);
if (sis630_initialized) {
printk(KERN_ERR "i2c-sis630.o: Oops, sis630_init called a second time!\n");
return -EBUSY;
}
sis630_initialized = 0;
if ((res = sis630_setup())) {
printk(KERN_ERR "i2c-sis630.o: SIS630 comp. bus not detected, module not inserted.\n");
i2c_sis630_cleanup();
return res;
}
sis630_initialized++;
sprintf(sis630_adapter.name, "SMBus SIS630 adapter at %04x",
acpi_base + SMB_STS);
if ((res = i2c_add_adapter(&sis630_adapter))) {
printk(KERN_ERR "i2c-sis630.o: Adapter registration failed, "
"module not inserted.\n");
i2c_sis630_cleanup();
return res;
}
sis630_initialized++;
printk(KERN_INFO "i2c-sis630.o: SIS630 comp. bus detected and initialized\n");
return 0;
}
int __init i2c_sis630_cleanup(void) {
int res;
if (sis630_initialized >= 2) {
if ((res = i2c_del_adapter(&sis630_adapter))) {
printk(KERN_ERR "i2c-sis630.o: i2c_del_adapter failed, module not"
"removed\n");
return res;
} else
sis630_initialized--;
}
if (sis630_initialized >= 1) {
release_region(acpi_base + SMB_STS, SIS630_SMB_IOREGION);
sis630_initialized--;
}
return 0;
}
EXPORT_NO_SYMBOLS;
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
#ifdef MODULE
MODULE_AUTHOR("Alexander Malysh <amalysh@web.de>");
MODULE_DESCRIPTION("SIS630 SMBus driver");
int init_module(void) {
return i2c_sis630_init();
}
int cleanup_module(void) {
return i2c_sis630_cleanup();
}
#endif /* MODULE */
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