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a03c2edf3db7e528ae1c193702304d2cf87dc34d
lm-sensors/kernel/busses/i2c-amd756.c
T
Mark D. Studebaker 3929e57a5b amd8111 support, patch from 
+* Vojtech Pavlik <vojtech@suse.cz>


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1616 7894878c-1315-0410-8ee3-d5d059ff63e0
2002-11-17 19:44:46 +00:00

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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)
*/
/*
Supports AMD756, AMD766, AMD768 and nVidia nForce
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_AMD_756
#define PCI_DEVICE_ID_AMD_756 0x740B
#endif
#ifndef PCI_DEVICE_ID_AMD_766
#define PCI_DEVICE_ID_AMD_766 0x7413
#endif
#ifndef PCI_DEVICE_ID_AMD_768_SMBUS
#define PCI_DEVICE_ID_AMD_768_SMBUS 0x7443
#endif
#ifndef PCI_DEVICE_ID_AMD_8111_SMBUS
#define PCI_DEVICE_ID_AMD_8111_SMBUS 0x746B
#endif
#ifndef PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS
#define PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS 0x01B4
#endif
struct sd {
const unsigned short vendor;
const unsigned short device;
const unsigned short function;
const char* name;
int amdsetup:1;
};
static struct sd supported[] = {
{PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_756, 3, "AMD756", 1},
{PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_766, 3, "AMD766", 1},
{PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_768_SMBUS, 3, "AMD768", 1},
{PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS, 3, "AMD8111", 1},
{PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS, 1, "nVidia nForce", 0},
{0, 0, 0}
};
/* AMD756 SMBus address offsets */
#define SMB_ADDR_OFFSET 0xE0
#define SMB_IOSIZE 16
#define SMB_GLOBAL_STATUS (0x0 + amd756_smba)
#define SMB_GLOBAL_ENABLE (0x2 + amd756_smba)
#define SMB_HOST_ADDRESS (0x4 + amd756_smba)
#define SMB_HOST_DATA (0x6 + amd756_smba)
#define SMB_HOST_COMMAND (0x8 + amd756_smba)
#define SMB_HOST_BLOCK_DATA (0x9 + amd756_smba)
#define SMB_HAS_DATA (0xA + amd756_smba)
#define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_smba)
#define SMB_HAS_HOST_ADDRESS (0xE + amd756_smba)
#define SMB_SNOOP_ADDRESS (0xF + amd756_smba)
/* 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
/* insmod parameters */
#ifdef MODULE
static
#else
extern
#endif
int __init i2c_amd756_init(void);
static int __init amd756_cleanup(void);
static int amd756_setup(void);
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);
static void amd756_do_pause(unsigned int amount);
static void amd756_abort(void);
static int amd756_transaction(void);
static void amd756_inc(struct i2c_adapter *adapter);
static void amd756_dec(struct i2c_adapter *adapter);
static u32 amd756_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 */ amd756_access,
/* slave;_send */ NULL,
/* slave_rcv */ NULL,
/* algo_control */ NULL,
/* functionality */ amd756_func,
};
static struct i2c_adapter amd756_adapter = {
"unset",
I2C_ALGO_SMBUS | I2C_HW_SMBUS_AMD756,
&smbus_algorithm,
NULL,
amd756_inc,
amd756_dec,
NULL,
NULL,
};
static int __initdata amd756_initialized;
static struct sd *amd756_sd = NULL;
static unsigned short amd756_smba = 0;
int amd756_setup(void)
{
unsigned char temp;
struct sd *currdev;
struct pci_dev *AMD756_dev = NULL;
if (pci_present() == 0) {
return -ENODEV;
}
/* Look for a supported chip */
for(currdev = supported; currdev->vendor; ) {
AMD756_dev = pci_find_device(currdev->vendor,
currdev->device, AMD756_dev);
if (AMD756_dev != NULL) {
if (PCI_FUNC(AMD756_dev->devfn) == currdev->function)
break;
} else {
currdev++;
}
}
if (AMD756_dev == NULL) {
printk
("i2c-amd756.o: Error: No AMD756 or compatible device detected!\n");
return -ENODEV;
}
printk(KERN_INFO "i2c-amd756.o: Found %s SMBus controller.\n", currdev->name);
if (currdev->amdsetup)
{
pci_read_config_byte(AMD756_dev, SMBGCFG, &temp);
if ((temp & 128) == 0) {
printk("i2c-amd756.o: 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(AMD756_dev, SMBBA, &amd756_smba);
amd756_smba &= 0xff00;
amd756_smba += SMB_ADDR_OFFSET;
} else {
pci_read_config_word(AMD756_dev, SMBBANFORCE, &amd756_smba);
amd756_smba &= 0xfffc;
}
if(amd756_smba == 0) {
printk(KERN_ERR "i2c-amd756.o: Error: SMB base address uninitialized\n");
return -ENODEV;
}
if (check_region(amd756_smba, SMB_IOSIZE)) {
printk
("i2c-amd756.o: SMB region 0x%x already in use!\n",
amd756_smba);
return -ENODEV;
}
/* Everything is happy, let's grab the memory and set things up. */
request_region(amd756_smba, SMB_IOSIZE, "amd756-smbus");
#ifdef DEBUG
pci_read_config_byte(AMD756_dev, SMBREV, &temp);
printk("i2c-amd756.o: SMBREV = 0x%X\n", temp);
printk("i2c-amd756.o: AMD756_smba = 0x%X\n", amd756_smba);
#endif /* DEBUG */
/* store struct sd * for future reference */
amd756_sd = currdev;
return 0;
}
/*
SMBUS event = I/O 28-29 bit 11
see E0 for the status bits and enabled in E2
*/
/* Internally used pause function */
void amd756_do_pause(unsigned int amount)
{
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(amount);
}
#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)
void amd756_abort(void)
{
printk("i2c-amd756.o: Sending abort.\n");
outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
amd756_do_pause(100);
outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
}
int amd756_transaction(void)
{
int temp;
int result = 0;
int timeout = 0;
#ifdef DEBUG
printk
("i2c-amd756.o: 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));
#endif
/* Make sure the SMBus host is ready to start transmitting */
if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
#ifdef DEBUG
printk
("i2c-amd756.o: SMBus busy (%04x). Waiting... \n", temp);
#endif
do {
amd756_do_pause(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) {
printk("i2c-amd756.o: Busy wait timeout! (%04x)\n", temp);
amd756_abort();
return -1;
}
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 {
amd756_do_pause(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) {
printk("i2c-amd756.o: Completion timeout!\n");
amd756_abort ();
return -1;
}
if (temp & GS_PRERR_STS) {
result = -1;
#ifdef DEBUG
printk("i2c-amd756.o: SMBus Protocol error (no response)!\n");
#endif
}
if (temp & GS_COL_STS) {
result = -1;
printk("i2c-amd756.o: SMBus collision!\n");
}
if (temp & GS_TO_STS) {
result = -1;
#ifdef DEBUG
printk("i2c-amd756.o: SMBus protocol timeout!\n");
#endif
}
#ifdef DEBUG
if (temp & GS_HCYC_STS) {
printk("i2c-amd756.o: SMBus protocol success!\n");
}
#endif
outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
#ifdef DEBUG
if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {
printk
("i2c-amd756.o: Failed reset at end of transaction (%04x)\n",
temp);
}
printk
("i2c-amd756.o: 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));
#endif
return result;
}
/* Return -1 on error. */
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:
printk
("i2c-amd756.o: 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);
/* TODO: Why only during write? */
if (read_write == I2C_SMBUS_WRITE)
outb_p(command, SMB_HOST_COMMAND);
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()) /* 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;
}
void amd756_inc(struct i2c_adapter *adapter)
{
MOD_INC_USE_COUNT;
}
void amd756_dec(struct i2c_adapter *adapter)
{
MOD_DEC_USE_COUNT;
}
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;
}
int __init i2c_amd756_init(void)
{
int res;
printk("i2c-amd756.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 (amd756_initialized) {
printk
("i2c-amd756.o: Oops, amd756_init called a second time!\n");
return -EBUSY;
}
#endif
amd756_initialized = 0;
if ((res = amd756_setup())) {
printk
("i2c-amd756.o: AMD756 or compatible device not detected, module not inserted.\n");
amd756_cleanup();
return res;
}
amd756_initialized++;
sprintf(amd756_adapter.name, "SMBus %s adapter at %04x",
amd756_sd->name, amd756_smba);
if ((res = i2c_add_adapter(&amd756_adapter))) {
printk
("i2c-amd756.o: Adapter registration failed, module not inserted.\n");
amd756_cleanup();
return res;
}
amd756_initialized++;
printk("i2c-amd756.o: %s bus detected and initialized\n",
amd756_sd->name);
return 0;
}
int __init amd756_cleanup(void)
{
int res;
if (amd756_initialized >= 2) {
if ((res = i2c_del_adapter(&amd756_adapter))) {
printk
("i2c-amd756.o: i2c_del_adapter failed, module not removed\n");
return res;
} else
amd756_initialized--;
}
if (amd756_initialized >= 1) {
release_region(amd756_smba, SMB_IOSIZE);
amd756_initialized--;
}
return 0;
}
EXPORT_NO_SYMBOLS;
#ifdef MODULE
MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
MODULE_DESCRIPTION("AMD756/766/768/nVidia nForce SMBus driver");
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
int init_module(void)
{
return i2c_amd756_init();
}
int cleanup_module(void)
{
return amd756_cleanup();
}
#endif /* MODULE */
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