431 lines
11 KiB
C
431 lines
11 KiB
C
/*
|
|
Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>
|
|
|
|
Shamelessly ripped from i2c-piix4.c:
|
|
|
|
Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
|
|
Philip Edelbrock <phil@netroedge.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.
|
|
*/
|
|
|
|
/*
|
|
2002-04-08: Added nForce support. (Csaba Halasz)
|
|
2002-10-03: Fixed nForce PnP I/O port. (Michael Steil)
|
|
2002-12-28: Rewritten into something that resembles a Linux driver (hch)
|
|
2003-11-29: Added back AMD8111 removed by the previous rewrite.
|
|
(Philip Pokorny)
|
|
*/
|
|
|
|
/*
|
|
Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce
|
|
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/delay.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/init.h>
|
|
#include <linux/acpi.h>
|
|
#include <asm/io.h>
|
|
|
|
/* AMD756 SMBus address offsets */
|
|
#define SMB_ADDR_OFFSET 0xE0
|
|
#define SMB_IOSIZE 16
|
|
#define SMB_GLOBAL_STATUS (0x0 + amd756_ioport)
|
|
#define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport)
|
|
#define SMB_HOST_ADDRESS (0x4 + amd756_ioport)
|
|
#define SMB_HOST_DATA (0x6 + amd756_ioport)
|
|
#define SMB_HOST_COMMAND (0x8 + amd756_ioport)
|
|
#define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport)
|
|
#define SMB_HAS_DATA (0xA + amd756_ioport)
|
|
#define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport)
|
|
#define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport)
|
|
#define SMB_SNOOP_ADDRESS (0xF + amd756_ioport)
|
|
|
|
/* PCI Address Constants */
|
|
|
|
/* address of I/O space */
|
|
#define SMBBA 0x058 /* mh */
|
|
#define SMBBANFORCE 0x014
|
|
|
|
/* general configuration */
|
|
#define SMBGCFG 0x041 /* mh */
|
|
|
|
/* silicon revision code */
|
|
#define SMBREV 0x008
|
|
|
|
/* Other settings */
|
|
#define MAX_TIMEOUT 500
|
|
|
|
/* AMD756 constants */
|
|
#define AMD756_QUICK 0x00
|
|
#define AMD756_BYTE 0x01
|
|
#define AMD756_BYTE_DATA 0x02
|
|
#define AMD756_WORD_DATA 0x03
|
|
#define AMD756_PROCESS_CALL 0x04
|
|
#define AMD756_BLOCK_DATA 0x05
|
|
|
|
static struct pci_driver amd756_driver;
|
|
static unsigned short amd756_ioport;
|
|
|
|
/*
|
|
SMBUS event = I/O 28-29 bit 11
|
|
see E0 for the status bits and enabled in E2
|
|
|
|
*/
|
|
#define GS_ABRT_STS (1 << 0)
|
|
#define GS_COL_STS (1 << 1)
|
|
#define GS_PRERR_STS (1 << 2)
|
|
#define GS_HST_STS (1 << 3)
|
|
#define GS_HCYC_STS (1 << 4)
|
|
#define GS_TO_STS (1 << 5)
|
|
#define GS_SMB_STS (1 << 11)
|
|
|
|
#define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \
|
|
GS_HCYC_STS | GS_TO_STS )
|
|
|
|
#define GE_CYC_TYPE_MASK (7)
|
|
#define GE_HOST_STC (1 << 3)
|
|
#define GE_ABORT (1 << 5)
|
|
|
|
|
|
static int amd756_transaction(struct i2c_adapter *adap)
|
|
{
|
|
int temp;
|
|
int result = 0;
|
|
int timeout = 0;
|
|
|
|
dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
|
|
"DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),
|
|
inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),
|
|
inb_p(SMB_HOST_DATA));
|
|
|
|
/* Make sure the SMBus host is ready to start transmitting */
|
|
if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
|
|
dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp);
|
|
do {
|
|
msleep(1);
|
|
temp = inw_p(SMB_GLOBAL_STATUS);
|
|
} while ((temp & (GS_HST_STS | GS_SMB_STS)) &&
|
|
(timeout++ < MAX_TIMEOUT));
|
|
/* If the SMBus is still busy, we give up */
|
|
if (timeout > MAX_TIMEOUT) {
|
|
dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp);
|
|
goto abort;
|
|
}
|
|
timeout = 0;
|
|
}
|
|
|
|
/* start the transaction by setting the start bit */
|
|
outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE);
|
|
|
|
/* We will always wait for a fraction of a second! */
|
|
do {
|
|
msleep(1);
|
|
temp = inw_p(SMB_GLOBAL_STATUS);
|
|
} while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT));
|
|
|
|
/* If the SMBus is still busy, we give up */
|
|
if (timeout > MAX_TIMEOUT) {
|
|
dev_dbg(&adap->dev, "Completion timeout!\n");
|
|
goto abort;
|
|
}
|
|
|
|
if (temp & GS_PRERR_STS) {
|
|
result = -ENXIO;
|
|
dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n");
|
|
}
|
|
|
|
if (temp & GS_COL_STS) {
|
|
result = -EIO;
|
|
dev_warn(&adap->dev, "SMBus collision!\n");
|
|
}
|
|
|
|
if (temp & GS_TO_STS) {
|
|
result = -ETIMEDOUT;
|
|
dev_dbg(&adap->dev, "SMBus protocol timeout!\n");
|
|
}
|
|
|
|
if (temp & GS_HCYC_STS)
|
|
dev_dbg(&adap->dev, "SMBus protocol success!\n");
|
|
|
|
outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
|
|
|
|
#ifdef DEBUG
|
|
if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {
|
|
dev_dbg(&adap->dev,
|
|
"Failed reset at end of transaction (%04x)\n", temp);
|
|
}
|
|
#endif
|
|
|
|
dev_dbg(&adap->dev,
|
|
"Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",
|
|
inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE),
|
|
inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA));
|
|
|
|
return result;
|
|
|
|
abort:
|
|
dev_warn(&adap->dev, "Sending abort\n");
|
|
outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
|
|
msleep(100);
|
|
outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
|
|
return -EIO;
|
|
}
|
|
|
|
/* Return negative errno on error. */
|
|
static s32 amd756_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;
|
|
int status;
|
|
|
|
switch (size) {
|
|
case I2C_SMBUS_QUICK:
|
|
outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
|
|
SMB_HOST_ADDRESS);
|
|
size = AMD756_QUICK;
|
|
break;
|
|
case I2C_SMBUS_BYTE:
|
|
outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
|
|
SMB_HOST_ADDRESS);
|
|
if (read_write == I2C_SMBUS_WRITE)
|
|
outb_p(command, SMB_HOST_DATA);
|
|
size = AMD756_BYTE;
|
|
break;
|
|
case I2C_SMBUS_BYTE_DATA:
|
|
outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
|
|
SMB_HOST_ADDRESS);
|
|
outb_p(command, SMB_HOST_COMMAND);
|
|
if (read_write == I2C_SMBUS_WRITE)
|
|
outw_p(data->byte, SMB_HOST_DATA);
|
|
size = AMD756_BYTE_DATA;
|
|
break;
|
|
case I2C_SMBUS_WORD_DATA:
|
|
outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
|
|
SMB_HOST_ADDRESS);
|
|
outb_p(command, SMB_HOST_COMMAND);
|
|
if (read_write == I2C_SMBUS_WRITE)
|
|
outw_p(data->word, SMB_HOST_DATA); /* TODO: endian???? */
|
|
size = AMD756_WORD_DATA;
|
|
break;
|
|
case I2C_SMBUS_BLOCK_DATA:
|
|
outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
|
|
SMB_HOST_ADDRESS);
|
|
outb_p(command, SMB_HOST_COMMAND);
|
|
if (read_write == I2C_SMBUS_WRITE) {
|
|
len = data->block[0];
|
|
if (len < 0)
|
|
len = 0;
|
|
if (len > 32)
|
|
len = 32;
|
|
outw_p(len, SMB_HOST_DATA);
|
|
/* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
|
|
for (i = 1; i <= len; i++)
|
|
outb_p(data->block[i],
|
|
SMB_HOST_BLOCK_DATA);
|
|
}
|
|
size = AMD756_BLOCK_DATA;
|
|
break;
|
|
default:
|
|
dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/* How about enabling interrupts... */
|
|
outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE);
|
|
|
|
status = amd756_transaction(adap);
|
|
if (status)
|
|
return status;
|
|
|
|
if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK))
|
|
return 0;
|
|
|
|
|
|
switch (size) {
|
|
case AMD756_BYTE:
|
|
data->byte = inw_p(SMB_HOST_DATA);
|
|
break;
|
|
case AMD756_BYTE_DATA:
|
|
data->byte = inw_p(SMB_HOST_DATA);
|
|
break;
|
|
case AMD756_WORD_DATA:
|
|
data->word = inw_p(SMB_HOST_DATA); /* TODO: endian???? */
|
|
break;
|
|
case AMD756_BLOCK_DATA:
|
|
data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f;
|
|
if(data->block[0] > 32)
|
|
data->block[0] = 32;
|
|
/* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
|
|
for (i = 1; i <= data->block[0]; i++)
|
|
data->block[i] = inb_p(SMB_HOST_BLOCK_DATA);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u32 amd756_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 const struct i2c_algorithm smbus_algorithm = {
|
|
.smbus_xfer = amd756_access,
|
|
.functionality = amd756_func,
|
|
};
|
|
|
|
struct i2c_adapter amd756_smbus = {
|
|
.owner = THIS_MODULE,
|
|
.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
|
|
.algo = &smbus_algorithm,
|
|
};
|
|
|
|
enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 };
|
|
static const char* chipname[] = {
|
|
"AMD756", "AMD766", "AMD768",
|
|
"nVidia nForce", "AMD8111",
|
|
};
|
|
|
|
static struct pci_device_id amd756_ids[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B),
|
|
.driver_data = AMD756 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413),
|
|
.driver_data = AMD766 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443),
|
|
.driver_data = AMD768 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS),
|
|
.driver_data = AMD8111 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS),
|
|
.driver_data = NFORCE },
|
|
{ 0, }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE (pci, amd756_ids);
|
|
|
|
static int __devinit amd756_probe(struct pci_dev *pdev,
|
|
const struct pci_device_id *id)
|
|
{
|
|
int nforce = (id->driver_data == NFORCE);
|
|
int error;
|
|
u8 temp;
|
|
|
|
if (amd756_ioport) {
|
|
dev_err(&pdev->dev, "Only one device supported "
|
|
"(you have a strange motherboard, btw)\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (nforce) {
|
|
if (PCI_FUNC(pdev->devfn) != 1)
|
|
return -ENODEV;
|
|
|
|
pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport);
|
|
amd756_ioport &= 0xfffc;
|
|
} else { /* amd */
|
|
if (PCI_FUNC(pdev->devfn) != 3)
|
|
return -ENODEV;
|
|
|
|
pci_read_config_byte(pdev, SMBGCFG, &temp);
|
|
if ((temp & 128) == 0) {
|
|
dev_err(&pdev->dev,
|
|
"Error: SMBus controller I/O not enabled!\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Determine the address of the SMBus areas */
|
|
/* Technically it is a dword but... */
|
|
pci_read_config_word(pdev, SMBBA, &amd756_ioport);
|
|
amd756_ioport &= 0xff00;
|
|
amd756_ioport += SMB_ADDR_OFFSET;
|
|
}
|
|
|
|
error = acpi_check_region(amd756_ioport, SMB_IOSIZE,
|
|
amd756_driver.name);
|
|
if (error)
|
|
return -ENODEV;
|
|
|
|
if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) {
|
|
dev_err(&pdev->dev, "SMB region 0x%x already in use!\n",
|
|
amd756_ioport);
|
|
return -ENODEV;
|
|
}
|
|
|
|
pci_read_config_byte(pdev, SMBREV, &temp);
|
|
dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp);
|
|
dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport);
|
|
|
|
/* set up the sysfs linkage to our parent device */
|
|
amd756_smbus.dev.parent = &pdev->dev;
|
|
|
|
snprintf(amd756_smbus.name, sizeof(amd756_smbus.name),
|
|
"SMBus %s adapter at %04x", chipname[id->driver_data],
|
|
amd756_ioport);
|
|
|
|
error = i2c_add_adapter(&amd756_smbus);
|
|
if (error) {
|
|
dev_err(&pdev->dev,
|
|
"Adapter registration failed, module not inserted\n");
|
|
goto out_err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
release_region(amd756_ioport, SMB_IOSIZE);
|
|
return error;
|
|
}
|
|
|
|
static void __devexit amd756_remove(struct pci_dev *dev)
|
|
{
|
|
i2c_del_adapter(&amd756_smbus);
|
|
release_region(amd756_ioport, SMB_IOSIZE);
|
|
}
|
|
|
|
static struct pci_driver amd756_driver = {
|
|
.name = "amd756_smbus",
|
|
.id_table = amd756_ids,
|
|
.probe = amd756_probe,
|
|
.remove = __devexit_p(amd756_remove),
|
|
};
|
|
|
|
static int __init amd756_init(void)
|
|
{
|
|
return pci_register_driver(&amd756_driver);
|
|
}
|
|
|
|
static void __exit amd756_exit(void)
|
|
{
|
|
pci_unregister_driver(&amd756_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
|
|
MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
EXPORT_SYMBOL(amd756_smbus);
|
|
|
|
module_init(amd756_init)
|
|
module_exit(amd756_exit)
|