WebSVN - shark - Rev 420 - /shark/branches/xen/drivers/i2c/busses/i2c-sis5595.c

/*
sis5595.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
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
*/

/* #define DEBUG 1 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.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 int force_addr = 0;
MODULE_PARM(force_addr, "i");
MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");

static unsigned short sis5595_base = 0;

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 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 :-( */
if (!request_region(sis5595_base + SMB_INDEX, 2, "sis5595-smbus")) {
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))
goto error;
if (!pci_read_config_word(SIS5595_dev, ACPI_BASE, &a))
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))
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))
goto error;
if (!pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val))
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 -1;
} else {
dev_dbg(&adap->dev, "Successfull!\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 {
i2c_delay(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 = -1;
}

if (temp & 0x10) {
dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
result = -1;
}

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 = -1;
}

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 -1 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)
{
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;
/*
case I2C_SMBUS_BLOCK_DATA:
printk("sis5595.o: Block data not yet implemented!\n");
return -1;
break;
*/
default:
printk
(KERN_WARNING "sis5595.o: Unsupported transaction %d\n", size);
return -1;
}

sis5595_write(SMB_CTL_LO, ((size & 0x0E)));

if (sis5595_transaction(adap))
return -1;

if ((size != SIS5595_PROC_CALL) &&
((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
return 0;

switch (size) {
case SIS5595_BYTE: /* Where is the result put? I assume here it is in
SMB_DATA but it might just as well be in the
SMB_CMD. No clue in the docs */
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 struct i2c_algorithm smbus_algorithm = {
.name = "Non-I2C SMBus adapter",
.id = I2C_ALGO_SMBUS,
.smbus_xfer = sis5595_access,
.functionality = sis5595_func,
};

static struct i2c_adapter sis5595_adapter = {
.owner = THIS_MODULE,
.name = "unset",
.algo = &smbus_algorithm,
};

static struct pci_device_id sis5595_ids[] __devinitdata = {
{ PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
{ 0, }
};

static int __devinit sis5595_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
if (sis5595_setup(dev)) {
dev_err(&dev->dev, "SIS5595 not detected, module not inserted.\n");
return -ENODEV;
}

/* set up the driverfs linkage to our parent device */
sis5595_adapter.dev.parent = &dev->dev;

sprintf(sis5595_adapter.name, "SMBus SIS5595 adapter at %04x",
sis5595_base + SMB_INDEX);
return i2c_add_adapter(&sis5595_adapter);
}

static void __devexit sis5595_remove(struct pci_dev *dev)
{
i2c_del_adapter(&sis5595_adapter);
}

static struct pci_driver sis5595_driver = {
.name = "sis5595 smbus",
.id_table = sis5595_ids,
.probe = sis5595_probe,
.remove = __devexit_p(sis5595_remove),
};

static int __init i2c_sis5595_init(void)
{
return pci_module_init(&sis5595_driver);
}

static void __exit i2c_sis5595_exit(void)
{
pci_unregister_driver(&sis5595_driver);
release_region(sis5595_base + SMB_INDEX, 2);
}

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);

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(root)/shark/branches/xen/drivers/i2c/busses/i2c-sis5595.c - Rev 420