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lm-sensors/kernel/busses/i2c-viapro.c
T
Mark D. Studebaker 0a92ee5cf0 remove ref. in comment to smbus.h 
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1388 7894878c-1315-0410-8ee3-d5d059ff63e0
2002-06-08 19:49:06 +00:00

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/*
i2c-viapro.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 1998 - 2001 Frodo Looijaard <frodol@dds.nl>,
Philip Edelbrock <phil@netroedge.com>, Kyösti Mälkki <kmalkki@cc.hut.fi>,
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.
*/
/*
Supports Via devices:
82C596A/B (0x3050)
82C596B (0x3051)
82C686A/B
8233, 8233A
8231
Note: we assume there can only be one device, with one SMBus interface.
*/
#include <linux/version.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <linux/kernel.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 PCI_DEVICE_ID_VIA_82C596_3
#define PCI_DEVICE_ID_VIA_82C596_3 0x3050
#endif
#ifndef PCI_DEVICE_ID_VIA_82C596B_3
#define PCI_DEVICE_ID_VIA_82C596B_3 0x3051
#endif
#ifndef PCI_DEVICE_ID_VIA_82C686_4
#define PCI_DEVICE_ID_VIA_82C686_4 0x3057
#endif
#ifndef PCI_DEVICE_ID_VIA_8233_0
#define PCI_DEVICE_ID_VIA_8233_0 0x3074
#endif
#define SMBBA1 0x90
#define SMBBA2 0x80
#define SMBBA3 0xD0
struct sd {
const unsigned short dev;
const unsigned char base;
const unsigned char hstcfg;
const char *name;
};
static struct sd supported[] = {
{PCI_DEVICE_ID_VIA_82C596_3, SMBBA1, 0xD2, "VT82C596A/B"},
{PCI_DEVICE_ID_VIA_82C596B_3, SMBBA1, 0xD2, "VT82C596B"},
{PCI_DEVICE_ID_VIA_82C686_4, SMBBA1, 0xD2, "VT82C686A/B"},
{PCI_DEVICE_ID_VIA_8233_0, SMBBA3, 0xD2, "VT8233"},
{0x3147, SMBBA3, 0xD2, "VT8233A"},
{0x8235, SMBBA1, 0xD2, "VT8231"},
{0, 0, 0, NULL}
};
static struct sd *num = supported;
/* SMBus address offsets */
#define SMBHSTSTS (0 + vt596_smba)
#define SMBHSLVSTS (1 + vt596_smba)
#define SMBHSTCNT (2 + vt596_smba)
#define SMBHSTCMD (3 + vt596_smba)
#define SMBHSTADD (4 + vt596_smba)
#define SMBHSTDAT0 (5 + vt596_smba)
#define SMBHSTDAT1 (6 + vt596_smba)
#define SMBBLKDAT (7 + vt596_smba)
#define SMBSLVCNT (8 + vt596_smba)
#define SMBSHDWCMD (9 + vt596_smba)
#define SMBSLVEVT (0xA + vt596_smba)
#define SMBSLVDAT (0xC + vt596_smba)
/* PCI Address Constants */
/* SMBus data in configuration space can be found in two places,
We try to select the better one*/
static unsigned short smb_cf_hstcfg;
#define SMBHSTCFG (smb_cf_hstcfg)
#define SMBSLVC (SMBHSTCFG+1)
#define SMBSHDW1 (SMBHSTCFG+2)
#define SMBSHDW2 (SMBHSTCFG+3)
#define SMBREV (SMBHSTCFG+4)
/* Other settings */
#define MAX_TIMEOUT 500
#define ENABLE_INT9 0
/* VT82C596 constants */
#define VT596_QUICK 0x00
#define VT596_BYTE 0x04
#define VT596_BYTE_DATA 0x08
#define VT596_WORD_DATA 0x0C
#define VT596_BLOCK_DATA 0x14
/* insmod parameters */
/* If force is set to anything different from 0, we forcibly enable the
VT596. DANGEROUS! */
static int force = 0;
MODULE_PARM(force, "i");
MODULE_PARM_DESC(force, "Forcibly enable the SMBus. DANGEROUS!");
/* If force_addr is set to anything different from 0, we forcibly enable
the VT596 at the given address. VERY DANGEROUS! */
static int force_addr = 0;
MODULE_PARM(force_addr, "i");
MODULE_PARM_DESC(force_addr,
"Forcibly enable the SMBus at the given address. "
"EXTREMELY DANGEROUS!");
#ifdef MODULE
static
#else
extern
#endif
int __init i2c_vt596_init(void);
static int __init vt596_cleanup(void);
static int vt596_setup(void);
static s32 vt596_access(struct i2c_adapter *adap, u16 addr,
unsigned short flags, char read_write,
u8 command, int size, union i2c_smbus_data *data);
static void vt596_do_pause(unsigned int amount);
static int vt596_transaction(void);
static void vt596_inc(struct i2c_adapter *adapter);
static void vt596_dec(struct i2c_adapter *adapter);
static u32 vt596_func(struct i2c_adapter *adapter);
#ifdef MODULE
extern int init_module(void);
extern int cleanup_module(void);
#endif /* MODULE */
static struct i2c_algorithm smbus_algorithm = {
/* name */ "Non-I2C SMBus adapter",
/* id */ I2C_ALGO_SMBUS,
/* master_xfer */ NULL,
/* smbus_access */ vt596_access,
/* slave_send */ NULL,
/* slave_rcv */ NULL,
/* algo_control */ NULL,
/* functionality */ vt596_func,
};
static struct i2c_adapter vt596_adapter = {
"unset",
I2C_ALGO_SMBUS | I2C_HW_SMBUS_VIA2,
&smbus_algorithm,
NULL,
vt596_inc,
vt596_dec,
NULL,
NULL,
};
static int __initdata vt596_initialized;
static unsigned short vt596_smba = 0;
/* Detect whether a compatible device can be found, and initialize it. */
int vt596_setup(void)
{
unsigned char temp;
struct pci_dev *VT596_dev = NULL;
/* First check whether we can access PCI at all */
if (pci_present() == 0)
return(-ENODEV);
/* Look for a supported device/function */
do {
if((VT596_dev = pci_find_device(PCI_VENDOR_ID_VIA, num->dev,
VT596_dev)))
break;
} while ((++num)->dev);
if (VT596_dev == NULL)
return(-ENODEV);
printk("i2c-viapro.o: Found Via %s device\n", num->name);
/* Determine the address of the SMBus areas */
smb_cf_hstcfg = num->hstcfg;
if (force_addr) {
vt596_smba = force_addr & 0xfff0;
force = 0;
} else {
if ((pci_read_config_word(VT596_dev, num->base, &vt596_smba))
|| !(vt596_smba & 0x1)) {
/* try 2nd address and config reg. for 596 */
if((num->dev == PCI_DEVICE_ID_VIA_82C596_3) &&
(!pci_read_config_word(VT596_dev, SMBBA2, &vt596_smba)) &&
(vt596_smba & 0x1)) {
smb_cf_hstcfg = 0x84;
} else {
/* no matches at all */
printk("i2c-viapro.o: Cannot configure SMBus "
"I/O Base address\n");
return(-ENODEV);
}
}
vt596_smba &= 0xfff0;
if(vt596_smba == 0) {
printk(KERN_ERR "i2c-viapro.o: SMBus base address"
"uninitialized - upgrade BIOS or use force_addr=0xaddr\n");
return -ENODEV;
}
}
if (check_region(vt596_smba, 8)) {
printk("i2c-viapro.o: SMBus region 0x%x already in use!\n",
vt596_smba);
return(-ENODEV);
}
pci_read_config_byte(VT596_dev, SMBHSTCFG, &temp);
/* If force_addr is set, we program the new address here. Just to make
sure, we disable the VT596 first. */
if (force_addr) {
pci_write_config_byte(VT596_dev, SMBHSTCFG, temp & 0xfe);
pci_write_config_word(VT596_dev, num->base, vt596_smba);
pci_write_config_byte(VT596_dev, SMBHSTCFG, temp | 0x01);
printk
("i2c-viapro.o: WARNING: SMBus interface set to new "
"address 0x%04x!\n", vt596_smba);
} else if ((temp & 1) == 0) {
if (force) {
/* NOTE: This assumes I/O space and other allocations WERE
done by the Bios! Don't complain if your hardware does weird
things after enabling this. :') Check for Bios updates before
resorting to this. */
pci_write_config_byte(VT596_dev, SMBHSTCFG,
temp | 1);
printk
("i2c-viapro.o: enabling SMBus device\n");
} else {
printk
("SMBUS: Error: Host SMBus controller not enabled! - "
"upgrade BIOS or use force=1\n");
return(-ENODEV);
}
}
/* Everything is happy, let's grab the memory and set things up. */
request_region(vt596_smba, 8, "viapro-smbus");
#ifdef DEBUG
if ((temp & 0x0E) == 8)
printk("i2c-viapro.o: using Interrupt 9 for SMBus.\n");
else if ((temp & 0x0E) == 0)
printk("i2c-viapro.o: using Interrupt SMI# for SMBus.\n");
else
printk
("i2c-viapro.o: Illegal Interrupt configuration (or code out "
"of date)!\n");
pci_read_config_byte(VT596_dev, SMBREV, &temp);
printk("i2c-viapro.o: SMBREV = 0x%X\n", temp);
printk("i2c-viapro.o: VT596_smba = 0x%X\n", vt596_smba);
#endif /* DEBUG */
return(0);
}
/* Internally used pause function */
void vt596_do_pause(unsigned int amount)
{
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(amount);
}
/* Another internally used function */
int vt596_transaction(void)
{
int temp;
int result = 0;
int timeout = 0;
#ifdef DEBUG
printk
("i2c-viapro.o: Transaction (pre): CNT=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, "
"DAT1=%02x\n", inb_p(SMBHSTCNT), inb_p(SMBHSTCMD),
inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
#endif
/* Make sure the SMBus host is ready to start transmitting */
if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
#ifdef DEBUG
printk("i2c-viapro.o: SMBus busy (0x%02x). Resetting... \n",
temp);
#endif
outb_p(temp, SMBHSTSTS);
if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
#ifdef DEBUG
printk("i2c-viapro.o: Failed! (0x%02x)\n", temp);
#endif
return -1;
} else {
#ifdef DEBUG
printk("i2c-viapro.o: Successfull!\n");
#endif
}
}
/* start the transaction by setting bit 6 */
outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
/* We will always wait for a fraction of a second!
I don't know if VIA needs this, Intel did */
do {
vt596_do_pause(1);
temp = inb_p(SMBHSTSTS);
} while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT));
/* If the SMBus is still busy, we give up */
if (timeout >= MAX_TIMEOUT) {
#ifdef DEBUG
printk("i2c-viapro.o: SMBus Timeout!\n");
result = -1;
#endif
}
if (temp & 0x10) {
result = -1;
#ifdef DEBUG
printk("i2c-viapro.o: Error: Failed bus transaction\n");
#endif
}
if (temp & 0x08) {
result = -1;
printk
("i2c-viapro.o: Bus collision! SMBus may be locked until next hard\n"
"reset. (sorry!)\n");
/* Clock stops and slave is stuck in mid-transmission */
}
if (temp & 0x04) {
result = -1;
#ifdef DEBUG
printk("i2c-viapro.o: Error: no response!\n");
#endif
}
if (inb_p(SMBHSTSTS) != 0x00)
outb_p(inb(SMBHSTSTS), SMBHSTSTS);
if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
#ifdef DEBUG
printk
("i2c-viapro.o: Failed reset at end of transaction (%02x)\n",
temp);
#endif
}
#ifdef DEBUG
printk
("i2c-viapro.o: Transaction (post): CNT=%02x, CMD=%02x, ADD=%02x, "
"DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT), inb_p(SMBHSTCMD),
inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
#endif
return result;
}
/* Return -1 on error. */
s32 vt596_access(struct i2c_adapter * adap, u16 addr, unsigned short flags,
char read_write,
u8 command, int size, union i2c_smbus_data * data)
{
int i, len;
switch (size) {
case I2C_SMBUS_PROC_CALL:
printk
("i2c-viapro.o: I2C_SMBUS_PROC_CALL not supported!\n");
return -1;
case I2C_SMBUS_QUICK:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD);
size = VT596_QUICK;
break;
case I2C_SMBUS_BYTE:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD);
if (read_write == I2C_SMBUS_WRITE)
outb_p(command, SMBHSTCMD);
size = VT596_BYTE;
break;
case I2C_SMBUS_BYTE_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD);
outb_p(command, SMBHSTCMD);
if (read_write == I2C_SMBUS_WRITE)
outb_p(data->byte, SMBHSTDAT0);
size = VT596_BYTE_DATA;
break;
case I2C_SMBUS_WORD_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD);
outb_p(command, SMBHSTCMD);
if (read_write == I2C_SMBUS_WRITE) {
outb_p(data->word & 0xff, SMBHSTDAT0);
outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
}
size = VT596_WORD_DATA;
break;
case I2C_SMBUS_BLOCK_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD);
outb_p(command, SMBHSTCMD);
if (read_write == I2C_SMBUS_WRITE) {
len = data->block[0];
if (len < 0)
len = 0;
if (len > 32)
len = 32;
outb_p(len, SMBHSTDAT0);
i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
for (i = 1; i <= len; i++)
outb_p(data->block[i], SMBBLKDAT);
}
size = VT596_BLOCK_DATA;
break;
}
outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
if (vt596_transaction()) /* Error in transaction */
return -1;
if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK))
return 0;
switch (size) {
case VT596_BYTE: /* Where is the result put? I assume here it is in
SMBHSTDAT0 but it might just as well be in the
SMBHSTCMD. No clue in the docs */
data->byte = inb_p(SMBHSTDAT0);
break;
case VT596_BYTE_DATA:
data->byte = inb_p(SMBHSTDAT0);
break;
case VT596_WORD_DATA:
data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
break;
case VT596_BLOCK_DATA:
data->block[0] = inb_p(SMBHSTDAT0);
i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
for (i = 1; i <= data->block[0]; i++)
data->block[i] = inb_p(SMBBLKDAT);
break;
}
return 0;
}
void vt596_inc(struct i2c_adapter *adapter)
{
MOD_INC_USE_COUNT;
}
void vt596_dec(struct i2c_adapter *adapter)
{
MOD_DEC_USE_COUNT;
}
u32 vt596_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_BLOCK_DATA;
}
int __init i2c_vt596_init(void)
{
int res;
printk("i2c-viapro.o version %s (%s)\n", LM_VERSION, LM_DATE);
#ifdef DEBUG
/* PE- It might be good to make this a permanent part of the code! */
if (vt596_initialized) {
printk
("i2c-viapro.o: Oops, vt596_init called a second time!\n");
return -EBUSY;
}
#endif
vt596_initialized = 0;
if ((res = vt596_setup())) {
printk
("i2c-viapro.o: Can't detect vt82c596 or compatible device, module not inserted.\n");
vt596_cleanup();
return res;
}
vt596_initialized++;
sprintf(vt596_adapter.name, "SMBus Via Pro adapter at %04x",
vt596_smba);
if ((res = i2c_add_adapter(&vt596_adapter))) {
printk
("i2c-viapro.o: Adapter registration failed, module not inserted.\n");
vt596_cleanup();
return res;
}
vt596_initialized++;
printk("i2c-viapro.o: Via Pro SMBus detected and initialized\n");
return 0;
}
int __init vt596_cleanup(void)
{
int res;
if (vt596_initialized >= 2) {
if ((res = i2c_del_adapter(&vt596_adapter))) {
printk
("i2c-viapro.o: i2c_del_adapter failed, module not removed\n");
return res;
} else
vt596_initialized--;
}
if (vt596_initialized >= 1) {
release_region(vt596_smba, 8);
vt596_initialized--;
}
return 0;
}
EXPORT_NO_SYMBOLS;
#ifdef MODULE
MODULE_AUTHOR
("Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("vt82c596 SMBus driver");
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
int init_module(void)
{
return i2c_vt596_init();
}
int cleanup_module(void)
{
return vt596_cleanup();
}
#endif /* MODULE */
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