435 lines
12 KiB
C
435 lines
12 KiB
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.
|
|
*/
|
|
|
|
/* Note: we assume there can only be one SIS5595 with one SMBus interface */
|
|
|
|
/*
|
|
Note: all have mfr. ID 0x1039.
|
|
SUPPORTED PCI ID
|
|
5595 0008
|
|
|
|
Note: these chips contain a 0008 device which is incompatible with the
|
|
5595. We recognize these by the presence of the listed
|
|
"blacklist" PCI ID and refuse to load.
|
|
|
|
NOT SUPPORTED PCI ID BLACKLIST PCI ID
|
|
540 0008 0540
|
|
550 0008 0550
|
|
5513 0008 5511
|
|
5581 0008 5597
|
|
5582 0008 5597
|
|
5597 0008 5597
|
|
5598 0008 5597/5598
|
|
630 0008 0630
|
|
645 0008 0645
|
|
646 0008 0646
|
|
648 0008 0648
|
|
650 0008 0650
|
|
651 0008 0651
|
|
730 0008 0730
|
|
735 0008 0735
|
|
745 0008 0745
|
|
746 0008 0746
|
|
*/
|
|
|
|
/* TO DO:
|
|
* Add Block Transfers (ugly, but supported by the adapter)
|
|
* Add adapter resets
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/init.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/acpi.h>
|
|
#include <asm/io.h>
|
|
|
|
static int blacklist[] = {
|
|
PCI_DEVICE_ID_SI_540,
|
|
PCI_DEVICE_ID_SI_550,
|
|
PCI_DEVICE_ID_SI_630,
|
|
PCI_DEVICE_ID_SI_645,
|
|
PCI_DEVICE_ID_SI_646,
|
|
PCI_DEVICE_ID_SI_648,
|
|
PCI_DEVICE_ID_SI_650,
|
|
PCI_DEVICE_ID_SI_651,
|
|
PCI_DEVICE_ID_SI_730,
|
|
PCI_DEVICE_ID_SI_735,
|
|
PCI_DEVICE_ID_SI_745,
|
|
PCI_DEVICE_ID_SI_746,
|
|
PCI_DEVICE_ID_SI_5511, /* 5513 chip has the 0008 device but that ID
|
|
shows up in other chips so we use the 5511
|
|
ID for recognition */
|
|
PCI_DEVICE_ID_SI_5597,
|
|
PCI_DEVICE_ID_SI_5598,
|
|
0, /* terminates the list */
|
|
};
|
|
|
|
/* Length of ISA address segment */
|
|
#define SIS5595_EXTENT 8
|
|
/* SIS5595 SMBus registers */
|
|
#define SMB_STS_LO 0x00
|
|
#define SMB_STS_HI 0x01
|
|
#define SMB_CTL_LO 0x02
|
|
#define SMB_CTL_HI 0x03
|
|
#define SMB_ADDR 0x04
|
|
#define SMB_CMD 0x05
|
|
#define SMB_PCNT 0x06
|
|
#define SMB_CNT 0x07
|
|
#define SMB_BYTE 0x08
|
|
#define SMB_DEV 0x10
|
|
#define SMB_DB0 0x11
|
|
#define SMB_DB1 0x12
|
|
#define SMB_HAA 0x13
|
|
|
|
/* PCI Address Constants */
|
|
#define SMB_INDEX 0x38
|
|
#define SMB_DAT 0x39
|
|
#define SIS5595_ENABLE_REG 0x40
|
|
#define ACPI_BASE 0x90
|
|
|
|
/* Other settings */
|
|
#define MAX_TIMEOUT 500
|
|
|
|
/* SIS5595 constants */
|
|
#define SIS5595_QUICK 0x00
|
|
#define SIS5595_BYTE 0x02
|
|
#define SIS5595_BYTE_DATA 0x04
|
|
#define SIS5595_WORD_DATA 0x06
|
|
#define SIS5595_PROC_CALL 0x08
|
|
#define SIS5595_BLOCK_DATA 0x0A
|
|
|
|
/* insmod parameters */
|
|
|
|
/* If force_addr is set to anything different from 0, we forcibly enable
|
|
the device at the given address. */
|
|
static u16 force_addr;
|
|
module_param(force_addr, ushort, 0);
|
|
MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");
|
|
|
|
static struct pci_driver sis5595_driver;
|
|
static unsigned short sis5595_base;
|
|
static struct pci_dev *sis5595_pdev;
|
|
|
|
static u8 sis5595_read(u8 reg)
|
|
{
|
|
outb(reg, sis5595_base + SMB_INDEX);
|
|
return inb(sis5595_base + SMB_DAT);
|
|
}
|
|
|
|
static void sis5595_write(u8 reg, u8 data)
|
|
{
|
|
outb(reg, sis5595_base + SMB_INDEX);
|
|
outb(data, sis5595_base + SMB_DAT);
|
|
}
|
|
|
|
static int __devinit sis5595_setup(struct pci_dev *SIS5595_dev)
|
|
{
|
|
u16 a;
|
|
u8 val;
|
|
int *i;
|
|
int retval = -ENODEV;
|
|
|
|
/* Look for imposters */
|
|
for (i = blacklist; *i != 0; i++) {
|
|
struct pci_dev *dev;
|
|
dev = pci_get_device(PCI_VENDOR_ID_SI, *i, NULL);
|
|
if (dev) {
|
|
dev_err(&SIS5595_dev->dev, "Looked for SIS5595 but found unsupported device %.4x\n", *i);
|
|
pci_dev_put(dev);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
/* Determine the address of the SMBus areas */
|
|
pci_read_config_word(SIS5595_dev, ACPI_BASE, &sis5595_base);
|
|
if (sis5595_base == 0 && force_addr == 0) {
|
|
dev_err(&SIS5595_dev->dev, "ACPI base address uninitialized - upgrade BIOS or use force_addr=0xaddr\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (force_addr)
|
|
sis5595_base = force_addr & ~(SIS5595_EXTENT - 1);
|
|
dev_dbg(&SIS5595_dev->dev, "ACPI Base address: %04x\n", sis5595_base);
|
|
|
|
/* NB: We grab just the two SMBus registers here, but this may still
|
|
* interfere with ACPI :-( */
|
|
retval = acpi_check_region(sis5595_base + SMB_INDEX, 2,
|
|
sis5595_driver.name);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (!request_region(sis5595_base + SMB_INDEX, 2,
|
|
sis5595_driver.name)) {
|
|
dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n",
|
|
sis5595_base + SMB_INDEX, sis5595_base + SMB_INDEX + 1);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (force_addr) {
|
|
dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
|
|
if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
|
|
!= PCIBIOS_SUCCESSFUL)
|
|
goto error;
|
|
if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
|
|
!= PCIBIOS_SUCCESSFUL)
|
|
goto error;
|
|
if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
|
|
/* doesn't work for some chips! */
|
|
dev_err(&SIS5595_dev->dev, "force address failed - not supported?\n");
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
|
|
!= PCIBIOS_SUCCESSFUL)
|
|
goto error;
|
|
if ((val & 0x80) == 0) {
|
|
dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
|
|
if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
|
|
!= PCIBIOS_SUCCESSFUL)
|
|
goto error;
|
|
if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
|
|
!= PCIBIOS_SUCCESSFUL)
|
|
goto error;
|
|
if ((val & 0x80) == 0) {
|
|
/* doesn't work for some chips? */
|
|
dev_err(&SIS5595_dev->dev, "ACPI enable failed - not supported?\n");
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Everything is happy */
|
|
return 0;
|
|
|
|
error:
|
|
release_region(sis5595_base + SMB_INDEX, 2);
|
|
return retval;
|
|
}
|
|
|
|
static int sis5595_transaction(struct i2c_adapter *adap)
|
|
{
|
|
int temp;
|
|
int result = 0;
|
|
int timeout = 0;
|
|
|
|
/* Make sure the SMBus host is ready to start transmitting */
|
|
temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
|
|
if (temp != 0x00) {
|
|
dev_dbg(&adap->dev, "SMBus busy (%04x). Resetting...\n", temp);
|
|
sis5595_write(SMB_STS_LO, temp & 0xff);
|
|
sis5595_write(SMB_STS_HI, temp >> 8);
|
|
if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) {
|
|
dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
|
|
return -EBUSY;
|
|
} else {
|
|
dev_dbg(&adap->dev, "Successful!\n");
|
|
}
|
|
}
|
|
|
|
/* start the transaction by setting bit 4 */
|
|
sis5595_write(SMB_CTL_LO, sis5595_read(SMB_CTL_LO) | 0x10);
|
|
|
|
/* We will always wait for a fraction of a second! */
|
|
do {
|
|
msleep(1);
|
|
temp = sis5595_read(SMB_STS_LO);
|
|
} while (!(temp & 0x40) && (timeout++ < MAX_TIMEOUT));
|
|
|
|
/* If the SMBus is still busy, we give up */
|
|
if (timeout > MAX_TIMEOUT) {
|
|
dev_dbg(&adap->dev, "SMBus Timeout!\n");
|
|
result = -ETIMEDOUT;
|
|
}
|
|
|
|
if (temp & 0x10) {
|
|
dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
|
|
result = -ENXIO;
|
|
}
|
|
|
|
if (temp & 0x20) {
|
|
dev_err(&adap->dev, "Bus collision! SMBus may be locked until "
|
|
"next hard reset (or not...)\n");
|
|
/* Clock stops and slave is stuck in mid-transmission */
|
|
result = -EIO;
|
|
}
|
|
|
|
temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
|
|
if (temp != 0x00) {
|
|
sis5595_write(SMB_STS_LO, temp & 0xff);
|
|
sis5595_write(SMB_STS_HI, temp >> 8);
|
|
}
|
|
|
|
temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
|
|
if (temp != 0x00)
|
|
dev_dbg(&adap->dev, "Failed reset at end of transaction (%02x)\n", temp);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Return negative errno on error. */
|
|
static s32 sis5595_access(struct i2c_adapter *adap, u16 addr,
|
|
unsigned short flags, char read_write,
|
|
u8 command, int size, union i2c_smbus_data *data)
|
|
{
|
|
int status;
|
|
|
|
switch (size) {
|
|
case I2C_SMBUS_QUICK:
|
|
sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
|
|
size = SIS5595_QUICK;
|
|
break;
|
|
case I2C_SMBUS_BYTE:
|
|
sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
|
|
if (read_write == I2C_SMBUS_WRITE)
|
|
sis5595_write(SMB_CMD, command);
|
|
size = SIS5595_BYTE;
|
|
break;
|
|
case I2C_SMBUS_BYTE_DATA:
|
|
sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
|
|
sis5595_write(SMB_CMD, command);
|
|
if (read_write == I2C_SMBUS_WRITE)
|
|
sis5595_write(SMB_BYTE, data->byte);
|
|
size = SIS5595_BYTE_DATA;
|
|
break;
|
|
case I2C_SMBUS_PROC_CALL:
|
|
case I2C_SMBUS_WORD_DATA:
|
|
sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
|
|
sis5595_write(SMB_CMD, command);
|
|
if (read_write == I2C_SMBUS_WRITE) {
|
|
sis5595_write(SMB_BYTE, data->word & 0xff);
|
|
sis5595_write(SMB_BYTE + 1,
|
|
(data->word & 0xff00) >> 8);
|
|
}
|
|
size = (size == I2C_SMBUS_PROC_CALL) ? SIS5595_PROC_CALL : SIS5595_WORD_DATA;
|
|
break;
|
|
default:
|
|
dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
sis5595_write(SMB_CTL_LO, ((size & 0x0E)));
|
|
|
|
status = sis5595_transaction(adap);
|
|
if (status)
|
|
return status;
|
|
|
|
if ((size != SIS5595_PROC_CALL) &&
|
|
((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
|
|
return 0;
|
|
|
|
|
|
switch (size) {
|
|
case SIS5595_BYTE:
|
|
case SIS5595_BYTE_DATA:
|
|
data->byte = sis5595_read(SMB_BYTE);
|
|
break;
|
|
case SIS5595_WORD_DATA:
|
|
case SIS5595_PROC_CALL:
|
|
data->word = sis5595_read(SMB_BYTE) + (sis5595_read(SMB_BYTE + 1) << 8);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static u32 sis5595_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_PROC_CALL;
|
|
}
|
|
|
|
static const struct i2c_algorithm smbus_algorithm = {
|
|
.smbus_xfer = sis5595_access,
|
|
.functionality = sis5595_func,
|
|
};
|
|
|
|
static struct i2c_adapter sis5595_adapter = {
|
|
.owner = THIS_MODULE,
|
|
.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
|
|
.algo = &smbus_algorithm,
|
|
};
|
|
|
|
static struct pci_device_id sis5595_ids[] __devinitdata = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
|
|
{ 0, }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE (pci, sis5595_ids);
|
|
|
|
static int __devinit sis5595_probe(struct pci_dev *dev, const struct pci_device_id *id)
|
|
{
|
|
int err;
|
|
|
|
if (sis5595_setup(dev)) {
|
|
dev_err(&dev->dev, "SIS5595 not detected, module not inserted.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* set up the sysfs linkage to our parent device */
|
|
sis5595_adapter.dev.parent = &dev->dev;
|
|
|
|
snprintf(sis5595_adapter.name, sizeof(sis5595_adapter.name),
|
|
"SMBus SIS5595 adapter at %04x", sis5595_base + SMB_INDEX);
|
|
err = i2c_add_adapter(&sis5595_adapter);
|
|
if (err) {
|
|
release_region(sis5595_base + SMB_INDEX, 2);
|
|
return err;
|
|
}
|
|
|
|
/* 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.
|
|
*/
|
|
sis5595_pdev = pci_dev_get(dev);
|
|
return -ENODEV;
|
|
}
|
|
|
|
static struct pci_driver sis5595_driver = {
|
|
.name = "sis5595_smbus",
|
|
.id_table = sis5595_ids,
|
|
.probe = sis5595_probe,
|
|
};
|
|
|
|
static int __init i2c_sis5595_init(void)
|
|
{
|
|
return pci_register_driver(&sis5595_driver);
|
|
}
|
|
|
|
static void __exit i2c_sis5595_exit(void)
|
|
{
|
|
pci_unregister_driver(&sis5595_driver);
|
|
if (sis5595_pdev) {
|
|
i2c_del_adapter(&sis5595_adapter);
|
|
release_region(sis5595_base + SMB_INDEX, 2);
|
|
pci_dev_put(sis5595_pdev);
|
|
sis5595_pdev = NULL;
|
|
}
|
|
}
|
|
|
|
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
|
|
MODULE_DESCRIPTION("SIS5595 SMBus driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(i2c_sis5595_init);
|
|
module_exit(i2c_sis5595_exit);
|