/*
* SMBus 2.0 driver for AMD-8111 IO-Hub.
*
* Copyright (c) 2002 Vojtech Pavlik
*
* 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 version 2.
*/
#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/init.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <asm/io.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR ("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("AMD8111 SMBus 2.0 driver");
struct amd_smbus {
struct pci_dev *dev;
struct i2c_adapter adapter;
int base;
int size;
};
/*
* AMD PCI control registers definitions.
*/
#define AMD_PCI_MISC 0x48
#define AMD_PCI_MISC_SCI 0x04 /* deliver SCI */
#define AMD_PCI_MISC_INT 0x02 /* deliver PCI IRQ */
#define AMD_PCI_MISC_SPEEDUP 0x01 /* 16x clock speedup */
/*
* ACPI 2.0 chapter 13 PCI interface definitions.
*/
#define AMD_EC_DATA 0x00 /* data register */
#define AMD_EC_SC 0x04 /* status of controller */
#define AMD_EC_CMD 0x04 /* command register */
#define AMD_EC_ICR 0x08 /* interrupt control register */
#define AMD_EC_SC_SMI 0x04 /* smi event pending */
#define AMD_EC_SC_SCI 0x02 /* sci event pending */
#define AMD_EC_SC_BURST 0x01 /* burst mode enabled */
#define AMD_EC_SC_CMD 0x08 /* byte in data reg is command */
#define AMD_EC_SC_IBF 0x02 /* data ready for embedded controller */
#define AMD_EC_SC_OBF 0x01 /* data ready for host */
#define AMD_EC_CMD_RD 0x80 /* read EC */
#define AMD_EC_CMD_WR 0x81 /* write EC */
#define AMD_EC_CMD_BE 0x82 /* enable burst mode */
#define AMD_EC_CMD_BD 0x83 /* disable burst mode */
#define AMD_EC_CMD_QR 0x84 /* query EC */
/*
* ACPI 2.0 chapter 13 access of registers of the EC
*/
static unsigned int amd_ec_wait_write(struct amd_smbus *smbus)
{
int timeout = 500;
while (timeout-- && (inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_IBF))
udelay(1);
if (!timeout) {
dev_warn(&smbus->dev->dev, "Timeout while waiting for IBF to clear\n");
return -1;
}
return 0;
}
static unsigned int amd_ec_wait_read(struct amd_smbus *smbus)
{
int timeout = 500;
while (timeout-- && (~inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_OBF))
udelay(1);
if (!timeout) {
dev_warn(&smbus->dev->dev, "Timeout while waiting for OBF to set\n");
return -1;
}
return 0;
}
static unsigned int amd_ec_read(struct amd_smbus *smbus, unsigned char address, unsigned char *data)
{
if (amd_ec_wait_write(smbus))
return -1;
outb(AMD_EC_CMD_RD, smbus->base + AMD_EC_CMD);
if (amd_ec_wait_write(smbus))
return -1;
outb(address, smbus->base + AMD_EC_DATA);
if (amd_ec_wait_read(smbus))
return -1;
*data = inb(smbus->base + AMD_EC_DATA);
return 0;
}
static unsigned int amd_ec_write(struct amd_smbus *smbus, unsigned char address, unsigned char data)
{
if (amd_ec_wait_write(smbus))
return -1;
outb(AMD_EC_CMD_WR, smbus->base + AMD_EC_CMD);
if (amd_ec_wait_write(smbus))
return -1;
outb(address, smbus->base + AMD_EC_DATA);
if (amd_ec_wait_write(smbus))
return -1;
outb(data, smbus->base + AMD_EC_DATA);
return 0;
}
/*
* ACPI 2.0 chapter 13 SMBus 2.0 EC register model
*/
#define AMD_SMB_PRTCL 0x00 /* protocol, PEC */
#define AMD_SMB_STS 0x01 /* status */
#define AMD_SMB_ADDR 0x02 /* address */
#define AMD_SMB_CMD 0x03 /* command */
#define AMD_SMB_DATA 0x04 /* 32 data registers */
#define AMD_SMB_BCNT 0x24 /* number of data bytes */
#define AMD_SMB_ALRM_A 0x25 /* alarm address */
#define AMD_SMB_ALRM_D 0x26 /* 2 bytes alarm data */
#define AMD_SMB_STS_DONE 0x80
#define AMD_SMB_STS_ALRM 0x40
#define AMD_SMB_STS_RES 0x20
#define AMD_SMB_STS_STATUS 0x1f
#define AMD_SMB_STATUS_OK 0x00
#define AMD_SMB_STATUS_FAIL 0x07
#define AMD_SMB_STATUS_DNAK 0x10
#define AMD_SMB_STATUS_DERR 0x11
#define AMD_SMB_STATUS_CMD_DENY 0x12
#define AMD_SMB_STATUS_UNKNOWN 0x13
#define AMD_SMB_STATUS_ACC_DENY 0x17
#define AMD_SMB_STATUS_TIMEOUT 0x18
#define AMD_SMB_STATUS_NOTSUP 0x19
#define AMD_SMB_STATUS_BUSY 0x1A
#define AMD_SMB_STATUS_PEC 0x1F
#define AMD_SMB_PRTCL_WRITE 0x00
#define AMD_SMB_PRTCL_READ 0x01
#define AMD_SMB_PRTCL_QUICK 0x02
#define AMD_SMB_PRTCL_BYTE 0x04
#define AMD_SMB_PRTCL_BYTE_DATA 0x06
#define AMD_SMB_PRTCL_WORD_DATA 0x08
#define AMD_SMB_PRTCL_BLOCK_DATA 0x0a
#define AMD_SMB_PRTCL_PROC_CALL 0x0c
#define AMD_SMB_PRTCL_BLOCK_PROC_CALL 0x0d
#define AMD_SMB_PRTCL_I2C_BLOCK_DATA 0x4a
#define AMD_SMB_PRTCL_PEC 0x80
static s32 amd8111_access(struct i2c_adapter * adap, u16 addr, unsigned short flags,
char read_write, u8 command, int size, union i2c_smbus_data * data)
{
struct amd_smbus *smbus = adap->algo_data;
unsigned char protocol, len, pec, temp[2];
int i;
protocol = (read_write == I2C_SMBUS_READ) ? AMD_SMB_PRTCL_READ : AMD_SMB_PRTCL_WRITE;
pec = (flags & I2C_CLIENT_PEC) ? AMD_SMB_PRTCL_PEC : 0;
switch (size) {
case I2C_SMBUS_QUICK:
protocol |= AMD_SMB_PRTCL_QUICK;
read_write = I2C_SMBUS_WRITE;
break;
case I2C_SMBUS_BYTE:
if (read_write == I2C_SMBUS_WRITE)
amd_ec_write(smbus, AMD_SMB_CMD, command);
protocol |= AMD_SMB_PRTCL_BYTE;
break;
case I2C_SMBUS_BYTE_DATA:
amd_ec_write(smbus, AMD_SMB_CMD, command);
if (read_write == I2C_SMBUS_WRITE)
amd_ec_write(smbus, AMD_SMB_DATA, data->byte);
protocol |= AMD_SMB_PRTCL_BYTE_DATA;
break;
case I2C_SMBUS_WORD_DATA:
amd_ec_write(smbus, AMD_SMB_CMD, command);
if (read_write == I2C_SMBUS_WRITE) {
amd_ec_write(smbus, AMD_SMB_DATA, data->word);
amd_ec_write(smbus, AMD_SMB_DATA + 1, data->word >> 8);
}
protocol |= AMD_SMB_PRTCL_WORD_DATA | pec;
break;
case I2C_SMBUS_BLOCK_DATA:
amd_ec_write(smbus, AMD_SMB_CMD, command);
if (read_write == I2C_SMBUS_WRITE) {
len = min_t(u8, data->block[0], 32);
amd_ec_write(smbus, AMD_SMB_BCNT, len);
for (i = 0; i < len; i++)
amd_ec_write(smbus, AMD_SMB_DATA + i, data->block[i + 1]);
}
protocol |= AMD_SMB_PRTCL_BLOCK_DATA | pec;
break;
case I2C_SMBUS_I2C_BLOCK_DATA:
len = min_t(u8, data->block[0], 32);
amd_ec_write(smbus, AMD_SMB_CMD, command);
amd_ec_write(smbus, AMD_SMB_BCNT, len);
if (read_write == I2C_SMBUS_WRITE)
for (i = 0; i < len; i++)
amd_ec_write(smbus, AMD_SMB_DATA + i, data->block[i + 1]);
protocol |= AMD_SMB_PRTCL_I2C_BLOCK_DATA;
break;
case I2C_SMBUS_PROC_CALL:
amd_ec_write(smbus, AMD_SMB_CMD, command);
amd_ec_write(smbus, AMD_SMB_DATA, data->word);
amd_ec_write(smbus, AMD_SMB_DATA + 1, data->word >> 8);
protocol = AMD_SMB_PRTCL_PROC_CALL | pec;
read_write = I2C_SMBUS_READ;
break;
case I2C_SMBUS_BLOCK_PROC_CALL:
protocol |= pec;
len = min_t(u8, data->block[0], 31);
amd_ec_write(smbus, AMD_SMB_CMD, command);
amd_ec_write(smbus, AMD_SMB_BCNT, len);
for (i = 0; i < len; i++)
amd_ec_write(smbus, AMD_SMB_DATA + i, data->block[i + 1]);
protocol = AMD_SMB_PRTCL_BLOCK_PROC_CALL | pec;
read_write = I2C_SMBUS_READ;
break;
case I2C_SMBUS_WORD_DATA_PEC:
case I2C_SMBUS_BLOCK_DATA_PEC:
case I2C_SMBUS_PROC_CALL_PEC:
case I2C_SMBUS_BLOCK_PROC_CALL_PEC:
dev_warn(&adap->dev, "Unexpected software PEC transaction %d\n.", size);
return -1;
default:
dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
return -1;
}
amd_ec_write(smbus, AMD_SMB_ADDR, addr << 1);
amd_ec_write(smbus, AMD_SMB_PRTCL, protocol);
amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
if (~temp[0] & AMD_SMB_STS_DONE) {
udelay(500);
amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
}
if (~temp[0] & AMD_SMB_STS_DONE) {
msleep(1);
amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
}
if ((~temp[0] & AMD_SMB_STS_DONE) || (temp[0] & AMD_SMB_STS_STATUS))
return -1;
if (read_write == I2C_SMBUS_WRITE)
return 0;
switch (size) {
case I2C_SMBUS_BYTE:
case I2C_SMBUS_BYTE_DATA:
amd_ec_read(smbus, AMD_SMB_DATA, &data->byte);
break;
case I2C_SMBUS_WORD_DATA:
case I2C_SMBUS_PROC_CALL:
amd_ec_read(smbus, AMD_SMB_DATA, temp + 0);
amd_ec_read(smbus, AMD_SMB_DATA + 1, temp + 1);
data->word = (temp[1] << 8) | temp[0];
break;
case I2C_SMBUS_BLOCK_DATA:
case I2C_SMBUS_BLOCK_PROC_CALL:
amd_ec_read(smbus, AMD_SMB_BCNT, &len);
len = min_t(u8, len, 32);
case I2C_SMBUS_I2C_BLOCK_DATA:
for (i = 0; i < len; i++)
amd_ec_read(smbus, AMD_SMB_DATA + i, data->block + i + 1);
data->block[0] = len;
break;
}
return 0;
}
static u32 amd8111_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 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
I2C_FUNC_SMBUS_I2C_BLOCK | I2C_FUNC_SMBUS_HWPEC_CALC;
}
static struct i2c_algorithm smbus_algorithm = {
.id = I2C_ALGO_SMBUS,
.smbus_xfer = amd8111_access,
.functionality = amd8111_func,
};
static struct pci_device_id amd8111_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS2) },
{ 0, }
};
MODULE_DEVICE_TABLE (pci, amd8111_ids);
static int __devinit amd8111_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
struct amd_smbus *smbus;
int error = -ENODEV;
if (~pci_resource_flags(dev, 0) & IORESOURCE_IO)
return -ENODEV;
smbus = kmalloc(sizeof(struct amd_smbus), GFP_KERNEL);
if (!smbus)
return -ENOMEM;
memset(smbus, 0, sizeof(struct amd_smbus));
smbus->dev = dev;
smbus->base = pci_resource_start(dev, 0);
smbus->size = pci_resource_len(dev, 0);
if (!request_region(smbus->base, smbus->size, "amd8111 SMBus 2.0"))
goto out_kfree;
smbus->adapter.owner = THIS_MODULE;
snprintf(smbus->adapter.name, I2C_NAME_SIZE,
"SMBus2 AMD8111 adapter at %04x", smbus->base);
smbus->adapter.class = I2C_CLASS_HWMON;
smbus->adapter.algo = &smbus_algorithm;
smbus->adapter.algo_data = smbus;
/* set up the driverfs linkage to our parent device */
smbus->adapter.dev.parent = &dev->dev;
error = i2c_add_adapter(&smbus->adapter);
if (error)
goto out_release_region;
pci_write_config_dword(smbus->dev, AMD_PCI_MISC, 0);
pci_set_drvdata(dev, smbus);
return 0;
out_release_region:
release_region(smbus->base, smbus->size);
out_kfree:
kfree(smbus);
return -1;
}
static void __devexit amd8111_remove(struct pci_dev *dev)
{
struct amd_smbus *smbus = pci_get_drvdata(dev);
i2c_del_adapter(&smbus->adapter);
release_region(smbus->base, smbus->size);
kfree(smbus);
}
static struct pci_driver amd8111_driver = {
.name = "amd8111_smbus2",
.id_table = amd8111_ids,
.probe = amd8111_probe,
.remove = __devexit_p(amd8111_remove),
};
static int __init i2c_amd8111_init(void)
{
return pci_register_driver(&amd8111_driver);
}
static void __exit i2c_amd8111_exit(void)
{
pci_unregister_driver(&amd8111_driver);
}
module_init(i2c_amd8111_init);
module_exit(i2c_amd8111_exit);
