1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
458 lines
13 KiB
C
458 lines
13 KiB
C
/*
|
|
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
|
|
8237
|
|
Note: we assume there can only be one device, with one SMBus interface.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/module.h>
|
|
#include <linux/delay.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>
|
|
|
|
static struct pci_dev *vt596_pdev;
|
|
|
|
#define SMBBA1 0x90
|
|
#define SMBBA2 0x80
|
|
#define SMBBA3 0xD0
|
|
|
|
/* SMBus address offsets */
|
|
static unsigned short vt596_smba;
|
|
#define SMBHSTSTS (vt596_smba + 0)
|
|
#define SMBHSLVSTS (vt596_smba + 1)
|
|
#define SMBHSTCNT (vt596_smba + 2)
|
|
#define SMBHSTCMD (vt596_smba + 3)
|
|
#define SMBHSTADD (vt596_smba + 4)
|
|
#define SMBHSTDAT0 (vt596_smba + 5)
|
|
#define SMBHSTDAT1 (vt596_smba + 6)
|
|
#define SMBBLKDAT (vt596_smba + 7)
|
|
#define SMBSLVCNT (vt596_smba + 8)
|
|
#define SMBSHDWCMD (vt596_smba + 9)
|
|
#define SMBSLVEVT (vt596_smba + 0xA)
|
|
#define SMBSLVDAT (vt596_smba + 0xC)
|
|
|
|
/* 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 = 0xD2;
|
|
|
|
#define SMBHSTCFG (smb_cf_hstcfg)
|
|
#define SMBSLVC (smb_cf_hstcfg + 1)
|
|
#define SMBSHDW1 (smb_cf_hstcfg + 2)
|
|
#define SMBSHDW2 (smb_cf_hstcfg + 3)
|
|
#define SMBREV (smb_cf_hstcfg + 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
|
|
|
|
|
|
/* If force is set to anything different from 0, we forcibly enable the
|
|
VT596. DANGEROUS! */
|
|
static int force;
|
|
module_param(force, bool, 0);
|
|
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 u16 force_addr;
|
|
module_param(force_addr, ushort, 0);
|
|
MODULE_PARM_DESC(force_addr,
|
|
"Forcibly enable the SMBus at the given address. "
|
|
"EXTREMELY DANGEROUS!");
|
|
|
|
|
|
static struct i2c_adapter vt596_adapter;
|
|
|
|
/* Another internally used function */
|
|
static int vt596_transaction(void)
|
|
{
|
|
int temp;
|
|
int result = 0;
|
|
int timeout = 0;
|
|
|
|
dev_dbg(&vt596_adapter.dev, "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));
|
|
|
|
/* Make sure the SMBus host is ready to start transmitting */
|
|
if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
|
|
dev_dbg(&vt596_adapter.dev, "SMBus busy (0x%02x). "
|
|
"Resetting...\n", temp);
|
|
|
|
outb_p(temp, SMBHSTSTS);
|
|
if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
|
|
dev_dbg(&vt596_adapter.dev, "Failed! (0x%02x)\n", temp);
|
|
|
|
return -1;
|
|
} else {
|
|
dev_dbg(&vt596_adapter.dev, "Successfull!\n");
|
|
}
|
|
}
|
|
|
|
/* 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 {
|
|
msleep(1);
|
|
temp = inb_p(SMBHSTSTS);
|
|
} while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT));
|
|
|
|
/* If the SMBus is still busy, we give up */
|
|
if (timeout >= MAX_TIMEOUT) {
|
|
result = -1;
|
|
dev_dbg(&vt596_adapter.dev, "SMBus Timeout!\n");
|
|
}
|
|
|
|
if (temp & 0x10) {
|
|
result = -1;
|
|
dev_dbg(&vt596_adapter.dev, "Error: Failed bus transaction\n");
|
|
}
|
|
|
|
if (temp & 0x08) {
|
|
result = -1;
|
|
dev_info(&vt596_adapter.dev, "Bus collision! SMBus may be "
|
|
"locked until next hard\nreset. (sorry!)\n");
|
|
/* Clock stops and slave is stuck in mid-transmission */
|
|
}
|
|
|
|
if (temp & 0x04) {
|
|
result = -1;
|
|
dev_dbg(&vt596_adapter.dev, "Error: no response!\n");
|
|
}
|
|
|
|
if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
|
|
outb_p(temp, SMBHSTSTS);
|
|
if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
|
|
dev_warn(&vt596_adapter.dev, "Failed reset at end "
|
|
"of transaction (%02x)\n", temp);
|
|
}
|
|
}
|
|
|
|
dev_dbg(&vt596_adapter.dev, "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));
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Return -1 on error. */
|
|
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)
|
|
{
|
|
int i, len;
|
|
|
|
switch (size) {
|
|
case I2C_SMBUS_PROC_CALL:
|
|
dev_info(&vt596_adapter.dev,
|
|
"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 > I2C_SMBUS_BLOCK_MAX)
|
|
len = I2C_SMBUS_BLOCK_MAX;
|
|
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);
|
|
if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
|
|
data->block[0] = I2C_SMBUS_BLOCK_MAX;
|
|
i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
|
|
for (i = 1; i <= data->block[0]; i++)
|
|
data->block[i] = inb_p(SMBBLKDAT);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static 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,
|
|
.class = I2C_CLASS_HWMON,
|
|
.algo = &smbus_algorithm,
|
|
.name = "unset",
|
|
};
|
|
|
|
static int __devinit vt596_probe(struct pci_dev *pdev,
|
|
const struct pci_device_id *id)
|
|
{
|
|
unsigned char temp;
|
|
int error = -ENODEV;
|
|
|
|
/* Determine the address of the SMBus areas */
|
|
if (force_addr) {
|
|
vt596_smba = force_addr & 0xfff0;
|
|
force = 0;
|
|
goto found;
|
|
}
|
|
|
|
if ((pci_read_config_word(pdev, id->driver_data, &vt596_smba)) ||
|
|
!(vt596_smba & 0x1)) {
|
|
/* try 2nd address and config reg. for 596 */
|
|
if (id->device == PCI_DEVICE_ID_VIA_82C596_3 &&
|
|
!pci_read_config_word(pdev, SMBBA2, &vt596_smba) &&
|
|
(vt596_smba & 0x1)) {
|
|
smb_cf_hstcfg = 0x84;
|
|
} else {
|
|
/* no matches at all */
|
|
dev_err(&pdev->dev, "Cannot configure "
|
|
"SMBus I/O Base address\n");
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
vt596_smba &= 0xfff0;
|
|
if (vt596_smba == 0) {
|
|
dev_err(&pdev->dev, "SMBus base address "
|
|
"uninitialized - upgrade BIOS or use "
|
|
"force_addr=0xaddr\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
found:
|
|
if (!request_region(vt596_smba, 8, "viapro-smbus")) {
|
|
dev_err(&pdev->dev, "SMBus region 0x%x already in use!\n",
|
|
vt596_smba);
|
|
return -ENODEV;
|
|
}
|
|
|
|
pci_read_config_byte(pdev, 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(pdev, SMBHSTCFG, temp & 0xfe);
|
|
pci_write_config_word(pdev, id->driver_data, vt596_smba);
|
|
pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01);
|
|
dev_warn(&pdev->dev, "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(pdev, SMBHSTCFG, temp | 1);
|
|
dev_info(&pdev->dev, "Enabling SMBus device\n");
|
|
} else {
|
|
dev_err(&pdev->dev, "SMBUS: Error: Host SMBus "
|
|
"controller not enabled! - upgrade BIOS or "
|
|
"use force=1\n");
|
|
goto release_region;
|
|
}
|
|
}
|
|
|
|
if ((temp & 0x0E) == 8)
|
|
dev_dbg(&pdev->dev, "using Interrupt 9 for SMBus.\n");
|
|
else if ((temp & 0x0E) == 0)
|
|
dev_dbg(&pdev->dev, "using Interrupt SMI# for SMBus.\n");
|
|
else
|
|
dev_dbg(&pdev->dev, "Illegal Interrupt configuration "
|
|
"(or code out of date)!\n");
|
|
|
|
pci_read_config_byte(pdev, SMBREV, &temp);
|
|
dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp);
|
|
dev_dbg(&pdev->dev, "VT596_smba = 0x%X\n", vt596_smba);
|
|
|
|
vt596_adapter.dev.parent = &pdev->dev;
|
|
snprintf(vt596_adapter.name, I2C_NAME_SIZE,
|
|
"SMBus Via Pro adapter at %04x", vt596_smba);
|
|
|
|
vt596_pdev = pci_dev_get(pdev);
|
|
if (i2c_add_adapter(&vt596_adapter)) {
|
|
pci_dev_put(vt596_pdev);
|
|
vt596_pdev = NULL;
|
|
}
|
|
|
|
/* Always return failure here. This is to allow other drivers to bind
|
|
* to this pci device. We don't really want to have control over the
|
|
* pci device, we only wanted to read as few register values from it.
|
|
*/
|
|
return -ENODEV;
|
|
|
|
release_region:
|
|
release_region(vt596_smba, 8);
|
|
return error;
|
|
}
|
|
|
|
static struct pci_device_id vt596_ids[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596_3),
|
|
.driver_data = SMBBA1 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596B_3),
|
|
.driver_data = SMBBA1 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4),
|
|
.driver_data = SMBBA1 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233_0),
|
|
.driver_data = SMBBA3 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233A),
|
|
.driver_data = SMBBA3 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235),
|
|
.driver_data = SMBBA3 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237),
|
|
.driver_data = SMBBA3 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4),
|
|
.driver_data = SMBBA1 },
|
|
{ 0, }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE (pci, vt596_ids);
|
|
|
|
static struct pci_driver vt596_driver = {
|
|
.name = "vt596_smbus",
|
|
.id_table = vt596_ids,
|
|
.probe = vt596_probe,
|
|
};
|
|
|
|
static int __init i2c_vt596_init(void)
|
|
{
|
|
return pci_register_driver(&vt596_driver);
|
|
}
|
|
|
|
|
|
static void __exit i2c_vt596_exit(void)
|
|
{
|
|
pci_unregister_driver(&vt596_driver);
|
|
if (vt596_pdev != NULL) {
|
|
i2c_del_adapter(&vt596_adapter);
|
|
release_region(vt596_smba, 8);
|
|
pci_dev_put(vt596_pdev);
|
|
vt596_pdev = NULL;
|
|
}
|
|
}
|
|
|
|
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);
|