wt/lm-sensors
1
0 Fork 0
mirror of https://github.com/lm-sensors/lm-sensors.git synced 2026-11-06 15:51:34 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
f42d0bee42ae58a14e0e95c3f29a76ecb754d618
lm-sensors/kernel/busses/i2c-viapro.c
T
Kyosti Malkki 1cfe63804a (Kyösti) Cleanups 
Copy sysctl enums to chip drivers from sensors.h for now,
   as seen in drivers included in 2.5 tree. File no longer included
   from kernel side.

   Apply i2c-proc change in CVS tagged -km2.

   Partial clean and sort of includes everywhere.

   Add i2c-dev.h, as a partial copy from i2c.
   Add to sensors.h from i2c-proc.h to compile things.
   Remove i2c-isa.h.

   Reflect header file changes to lib/ and prog/.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1705 7894878c-1315-0410-8ee3-d5d059ff63e0
2003-01-21 20:01:27 +00:00

525 lines
13 KiB
C
Raw Blame History

/*
i2c-viapro.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 1998 - 2002 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
8231
8233
8233A (0x3147 and 0x3177)
8235
Note: we assume there can only be one device, with one SMBus interface.
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <asm/io.h>
#include "version.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"},
{0x3177, SMBBA3, 0xD2, "VT8233A/8235"},
{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!");
static void vt596_do_pause(unsigned int amount);
static int vt596_transaction(void);
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;
}
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;
}
static struct i2c_algorithm smbus_algorithm = {
.name = "Non-I2C SMBus adapter",
.id = I2C_ALGO_SMBUS,
.smbus_xfer = vt596_access,
.functionality = vt596_func,
};
static struct i2c_adapter vt596_adapter = {
.owner = THIS_MODULE,
.name = "unset",
.id = I2C_ALGO_SMBUS | I2C_HW_SMBUS_VIA2,
.algo = &smbus_algorithm,
};
static struct pci_device_id vt596_ids[] __devinitdata = {
{ 0, }
};
static int __devinit vt596_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
if (vt596_setup()) {
printk
("i2c-viapro.o: Can't detect vt82c596 or compatible device, module not inserted.\n");
return -ENODEV;
}
sprintf(vt596_adapter.name, "SMBus Via Pro adapter at %04x",
vt596_smba);
i2c_add_adapter(&vt596_adapter);
}
static void __devexit vt596_remove(struct pci_dev *dev)
{
i2c_del_adapter(&vt596_adapter);
}
static struct pci_driver vt596_driver = {
.name = "vt596 smbus",
.id_table = vt596_ids,
.probe = vt596_probe,
.remove = __devexit_p(vt596_remove),
};
static int __init i2c_vt596_init(void)
{
printk("i2c-viapro.o version %s (%s)\n", LM_VERSION, LM_DATE);
return pci_module_init(&vt596_driver);
}
static void __exit i2c_vt596_exit(void)
{
pci_unregister_driver(&vt596_driver);
release_region(vt596_smba, 8);
}
MODULE_AUTHOR
("Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("vt82c596 SMBus driver");
MODULE_LICENSE("GPL");
module_init(i2c_vt596_init);
module_exit(i2c_vt596_exit);
Reference in new issue View Git Blame Copy Permalink