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lm-sensors/kernel/busses/i2c-sis630.c
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/*
SIS 630 SMBUS access implementation based on i2c-sis5595.
Status: beta
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:
24.08.2002
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
Check SMBALT# : why it can't be cleared ????
Test on 2.2 kernel
*/
/*
Supports:
SIS 630
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
/* 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;
MODULE_PARM(force, "i");
MODULE_PARM_DESC(force, "Forcibly enable the SIS630. DANGEROUS!");
#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;
/*
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, 0x02);
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
}
}
/* disable timeout interrupt , don't set Host Master Clock to 56KHz (it's hung my Laptop)*/
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);
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 != I2C_SMBUS_PROC_CALL) &&
((read_write == I2C_SMBUS_WRITE) || (size == I2C_SMBUS_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;
/* 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 */
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 SIS630!\n");
return -ENODEV;
}
tmp = pci_find_device(PCI_VENDOR_ID_SI,PCI_DEVICE_ID_SI_630,NULL);
if (tmp == NULL && force == 0) {
printk(KERN_ERR "i2c-sis630.o: Error: Can't detect SIS630!\n");
return -ENODEV;
}
else if (tmp == NULL && force > 0) {
printk(KERN_NOTICE "i2c-sis630.o: WARNING: Can't detect SIS630 , 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 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 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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