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linux-next/drivers/i2c/busses/i2c-amd756.c
Jean Delvare 0f07a24b4b i2c: Let the user specify PCI driver data through new_id 
The i2c-amd756 and i2c-viapro drivers make use of the driver_data
field of the PCI device ID. When adding device IDs dynamically (by
writing to the new_id sysfs file) you cannot set the value of this
field by default. It has to be allowed explicitly. Do that, and
check the value so that the user can't crash the kernel accidentally.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-27 18:14:51 +01:00

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/*
amd756.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
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 <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 = -1;
dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n");
}
if (temp & GS_COL_STS) {
result = -1;
dev_warn(&adap->dev, "SMBus collision!\n");
}
if (temp & GS_TO_STS) {
result = -1;
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 -1;
}
/* Return -1 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;
/** TODO: Should I supporte the 10-bit transfers? */
switch (size) {
case I2C_SMBUS_PROC_CALL:
dev_dbg(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
/* TODO: Well... It is supported, I'm just not sure what to do here... */
return -1;
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;
}
/* How about enabling interrupts... */
outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE);
if (amd756_transaction(adap)) /* Error in transaction */
return -1;
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 | I2C_FUNC_SMBUS_PROC_CALL;
}
static const struct i2c_algorithm smbus_algorithm = {
.smbus_xfer = amd756_access,
.functionality = amd756_func,
};
struct i2c_adapter amd756_smbus = {
.owner = THIS_MODULE,
.id = I2C_HW_SMBUS_AMD756,
.class = I2C_CLASS_HWMON,
.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;
/* driver_data might come from user-space, so check it */
if (id->driver_data > ARRAY_SIZE(chipname))
return -EINVAL;
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;
}
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;
sprintf(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),
.dynids.use_driver_data = 1,
};
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)
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