drivers/i2c/busses/i2c-ali1563.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /**
  *	i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
  *
  *	Copyright (C) 2004 Patrick Mochel
  *		      2005 Rudolf Marek <r.marek@assembler.cz>
  *
  *	The 1563 southbridge is deceptively similar to the 1533, with a
  *	few notable exceptions. One of those happens to be the fact they
  *	upgraded the i2c core to be 2.0 compliant, and happens to be almost
  *	identical to the i2c controller found in the Intel 801 south
  *	bridges.
  *
  *	This driver is based on a mix of the 15x3, 1535, and i801 drivers,
  *	with a little help from the ALi 1563 spec.
  */

 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/pci.h>
 #include <linux/acpi.h>

 #define ALI1563_MAX_TIMEOUT	500
 #define	ALI1563_SMBBA		0x80
 #define ALI1563_SMB_IOEN	1
 #define ALI1563_SMB_HOSTEN	2
 #define ALI1563_SMB_IOSIZE	16

 #define SMB_HST_STS	(ali1563_smba + 0)
 #define SMB_HST_CNTL1	(ali1563_smba + 1)
 #define SMB_HST_CNTL2	(ali1563_smba + 2)
 #define SMB_HST_CMD	(ali1563_smba + 3)
 #define SMB_HST_ADD	(ali1563_smba + 4)
 #define SMB_HST_DAT0	(ali1563_smba + 5)
 #define SMB_HST_DAT1	(ali1563_smba + 6)
 #define SMB_BLK_DAT	(ali1563_smba + 7)

 #define HST_STS_BUSY	0x01
 #define HST_STS_INTR	0x02
 #define HST_STS_DEVERR	0x04
 #define HST_STS_BUSERR	0x08
 #define HST_STS_FAIL	0x10
 #define HST_STS_DONE	0x80
 #define HST_STS_BAD	0x1c


 #define HST_CNTL1_TIMEOUT	0x80
 #define HST_CNTL1_LAST		0x40

 #define HST_CNTL2_KILL		0x04
 #define HST_CNTL2_START		0x40
 #define HST_CNTL2_QUICK		0x00
 #define HST_CNTL2_BYTE		0x01
 #define HST_CNTL2_BYTE_DATA	0x02
 #define HST_CNTL2_WORD_DATA	0x03
 #define HST_CNTL2_BLOCK		0x05


 #define HST_CNTL2_SIZEMASK	0x38

 static struct pci_driver ali1563_pci_driver;
 static unsigned short ali1563_smba;

 static int ali1563_transaction(struct i2c_adapter *a, int size)
 {
 	u32 data;
 	int timeout;
 	int status = -EIO;

 	dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
 		"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
 		inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
 		inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
 		inb_p(SMB_HST_DAT1));

 	data = inb_p(SMB_HST_STS);
 	if (data & HST_STS_BAD) {
 		dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
 		outb_p(data | HST_STS_BAD, SMB_HST_STS);
 		data = inb_p(SMB_HST_STS);
 		if (data & HST_STS_BAD)
 			return -EBUSY;
 	}
 	outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);

 	timeout = ALI1563_MAX_TIMEOUT;
 	do {
 		msleep(1);
 	} while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);

 	dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
 		"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
 		inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
 		inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
 		inb_p(SMB_HST_DAT1));

 	if (timeout && !(data & HST_STS_BAD))
 		return 0;

 	if (!timeout) {
 		dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
 		/* Issue 'kill' to host controller */
 		outb_p(HST_CNTL2_KILL, SMB_HST_CNTL2);
 		data = inb_p(SMB_HST_STS);
 		status = -ETIMEDOUT;
 	}

 	/* device error - no response, ignore the autodetection case */
 	if (data & HST_STS_DEVERR) {
 		if (size != HST_CNTL2_QUICK)
 			dev_err(&a->dev, "Device error!\n");
 		status = -ENXIO;
 	}
 	/* bus collision */
 	if (data & HST_STS_BUSERR) {
 		dev_err(&a->dev, "Bus collision!\n");
 		/* Issue timeout, hoping it helps */
 		outb_p(HST_CNTL1_TIMEOUT, SMB_HST_CNTL1);
 	}

 	if (data & HST_STS_FAIL) {
 		dev_err(&a->dev, "Cleaning fail after KILL!\n");
 		outb_p(0x0, SMB_HST_CNTL2);
 	}

 	return status;
 }

 static int ali1563_block_start(struct i2c_adapter *a)
 {
 	u32 data;
 	int timeout;
 	int status = -EIO;

 	dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
 		"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
 		inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
 		inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
 		inb_p(SMB_HST_DAT1));

 	data = inb_p(SMB_HST_STS);
 	if (data & HST_STS_BAD) {
 		dev_warn(&a->dev, "ali1563: Trying to reset busy device\n");
 		outb_p(data | HST_STS_BAD, SMB_HST_STS);
 		data = inb_p(SMB_HST_STS);
 		if (data & HST_STS_BAD)
 			return -EBUSY;
 	}

 	/* Clear byte-ready bit */
 	outb_p(data | HST_STS_DONE, SMB_HST_STS);

 	/* Start transaction and wait for byte-ready bit to be set */
 	outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);

 	timeout = ALI1563_MAX_TIMEOUT;
 	do {
 		msleep(1);
 	} while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);

 	dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
 		"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
 		inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
 		inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
 		inb_p(SMB_HST_DAT1));

 	if (timeout && !(data & HST_STS_BAD))
 		return 0;

 	if (timeout == 0)
 		status = -ETIMEDOUT;

 	if (data & HST_STS_DEVERR)
 		status = -ENXIO;

 	dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
 		timeout ? "" : "Timeout ",
 		data & HST_STS_FAIL ? "Transaction Failed " : "",
 		data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
 		data & HST_STS_DEVERR ? "Device Error " : "",
 		!(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
 	return status;
 }

 static int ali1563_block(struct i2c_adapter *a,
 			 union i2c_smbus_data *data, u8 rw)
 {
 	int i, len;
 	int error = 0;

 	/* Do we need this? */
 	outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);

 	if (rw == I2C_SMBUS_WRITE) {
 		len = data->block[0];
 		if (len < 1)
 			len = 1;
 		else if (len > 32)
 			len = 32;
 		outb_p(len, SMB_HST_DAT0);
 		outb_p(data->block[1], SMB_BLK_DAT);
 	} else
 		len = 32;

 	outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2);

 	for (i = 0; i < len; i++) {
 		if (rw == I2C_SMBUS_WRITE) {
 			outb_p(data->block[i + 1], SMB_BLK_DAT);
 			error = ali1563_block_start(a);
 			if (error)
 				break;
 		} else {
 			error = ali1563_block_start(a);
 			if (error)
 				break;
 			if (i == 0) {
 				len = inb_p(SMB_HST_DAT0);
 				if (len < 1)
 					len = 1;
 				else if (len > 32)
 					len = 32;
 			}
 			data->block[i+1] = inb_p(SMB_BLK_DAT);
 		}
 	}
 	/* Do we need this? */
 	outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
 	return error;
 }

 static s32 ali1563_access(struct i2c_adapter *a, u16 addr,
 			  unsigned short flags, char rw, u8 cmd,
 			  int size, union i2c_smbus_data *data)
 {
 	int error = 0;
 	int timeout;
 	u32 reg;

 	for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
 		reg = inb_p(SMB_HST_STS);
 		if (!(reg & HST_STS_BUSY))
 			break;
 	}
 	if (!timeout)
 		dev_warn(&a->dev, "SMBus not idle. HST_STS = %02x\n", reg);
 	outb_p(0xff, SMB_HST_STS);

 	/* Map the size to what the chip understands */
 	switch (size) {
 	case I2C_SMBUS_QUICK:
 		size = HST_CNTL2_QUICK;
 		break;
 	case I2C_SMBUS_BYTE:
 		size = HST_CNTL2_BYTE;
 		break;
 	case I2C_SMBUS_BYTE_DATA:
 		size = HST_CNTL2_BYTE_DATA;
 		break;
 	case I2C_SMBUS_WORD_DATA:
 		size = HST_CNTL2_WORD_DATA;
 		break;
 	case I2C_SMBUS_BLOCK_DATA:
 		size = HST_CNTL2_BLOCK;
 		break;
 	default:
 		dev_warn(&a->dev, "Unsupported transaction %d\n", size);
 		error = -EOPNOTSUPP;
 		goto Done;
 	}

 	outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD);
 	outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) |
 	       (size << 3), SMB_HST_CNTL2);

 	/* Write the command register */

 	switch (size) {
 	case HST_CNTL2_BYTE:
 		if (rw == I2C_SMBUS_WRITE)
 			/* Beware it uses DAT0 register and not CMD! */
 			outb_p(cmd, SMB_HST_DAT0);
 		break;
 	case HST_CNTL2_BYTE_DATA:
 		outb_p(cmd, SMB_HST_CMD);
 		if (rw == I2C_SMBUS_WRITE)
 			outb_p(data->byte, SMB_HST_DAT0);
 		break;
 	case HST_CNTL2_WORD_DATA:
 		outb_p(cmd, SMB_HST_CMD);
 		if (rw == I2C_SMBUS_WRITE) {
 			outb_p(data->word & 0xff, SMB_HST_DAT0);
 			outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
 		}
 		break;
 	case HST_CNTL2_BLOCK:
 		outb_p(cmd, SMB_HST_CMD);
 		error = ali1563_block(a, data, rw);
 		goto Done;
 	}

 	error = ali1563_transaction(a, size);
 	if (error)
 		goto Done;

 	if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK))
 		goto Done;

 	switch (size) {
 	case HST_CNTL2_BYTE:	/* Result put in SMBHSTDAT0 */
 		data->byte = inb_p(SMB_HST_DAT0);
 		break;
 	case HST_CNTL2_BYTE_DATA:
 		data->byte = inb_p(SMB_HST_DAT0);
 		break;
 	case HST_CNTL2_WORD_DATA:
 		data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
 		break;
 	}
 Done:
 	return error;
 }

 static u32 ali1563_func(struct i2c_adapter *a)
 {
 	return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 	    I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 	    I2C_FUNC_SMBUS_BLOCK_DATA;
 }


 static int ali1563_setup(struct pci_dev *dev)
 {
 	u16 ctrl;

 	pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);

 	/* SMB I/O Base in high 12 bits and must be aligned with the
 	 * size of the I/O space. */
 	ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
 	if (!ali1563_smba) {
 		dev_warn(&dev->dev, "ali1563_smba Uninitialized\n");
 		goto Err;
 	}

 	/* Check if device is enabled */
 	if (!(ctrl & ALI1563_SMB_HOSTEN)) {
 		dev_warn(&dev->dev, "Host Controller not enabled\n");
 		goto Err;
 	}
 	if (!(ctrl & ALI1563_SMB_IOEN)) {
 		dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
 		pci_write_config_word(dev, ALI1563_SMBBA,
 				      ctrl | ALI1563_SMB_IOEN);
 		pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
 		if (!(ctrl & ALI1563_SMB_IOEN)) {
 			dev_err(&dev->dev,
 				"I/O space still not enabled, giving up\n");
 			goto Err;
 		}
 	}

 	if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
 			      ali1563_pci_driver.name))
 		goto Err;

 	if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
 			    ali1563_pci_driver.name)) {
 		dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
 			ali1563_smba);
 		goto Err;
 	}
 	dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);

 	return 0;
 Err:
 	return -ENODEV;
 }

 static void ali1563_shutdown(struct pci_dev *dev)
 {
 	release_region(ali1563_smba, ALI1563_SMB_IOSIZE);
 }

 static const struct i2c_algorithm ali1563_algorithm = {
 	.smbus_xfer	= ali1563_access,
 	.functionality	= ali1563_func,
 };

 static struct i2c_adapter ali1563_adapter = {
 	.owner	= THIS_MODULE,
 	.class	= I2C_CLASS_HWMON | I2C_CLASS_SPD,
 	.algo	= &ali1563_algorithm,
 };

 static int ali1563_probe(struct pci_dev *dev,
 			 const struct pci_device_id *id_table)
 {
 	int error;

 	error = ali1563_setup(dev);
 	if (error)
 		goto exit;
 	ali1563_adapter.dev.parent = &dev->dev;
 	snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
 		 "SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
 	error = i2c_add_adapter(&ali1563_adapter);
 	if (error)
 		goto exit_shutdown;
 	return 0;

 exit_shutdown:
 	ali1563_shutdown(dev);
 exit:
 	dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
 	return error;
 }

 static void ali1563_remove(struct pci_dev *dev)
 {
 	i2c_del_adapter(&ali1563_adapter);
 	ali1563_shutdown(dev);
 }

 static const struct pci_device_id ali1563_id_table[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
 	{},
 };

 MODULE_DEVICE_TABLE(pci, ali1563_id_table);

 static struct pci_driver ali1563_pci_driver = {
 	.name		= "ali1563_smbus",
 	.id_table	= ali1563_id_table,
 	.probe		= ali1563_probe,
 	.remove		= ali1563_remove,
 };

 module_pci_driver(ali1563_pci_driver);

 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/**
	* i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
	*
	* Copyright (C) 2004 Patrick Mochel
	* 2005 Rudolf Marek <r.marek@assembler.cz>
	*
	* The 1563 southbridge is deceptively similar to the 1533, with a
	* few notable exceptions. One of those happens to be the fact they
	* upgraded the i2c core to be 2.0 compliant, and happens to be almost
	* identical to the i2c controller found in the Intel 801 south
	* bridges.
	*
	* This driver is based on a mix of the 15x3, 1535, and i801 drivers,
	* with a little help from the ALi 1563 spec.
	*/

	#include <linux/module.h>
	#include <linux/delay.h>
	#include <linux/i2c.h>
	#include <linux/pci.h>
	#include <linux/acpi.h>

	#define ALI1563_MAX_TIMEOUT 500
	#define ALI1563_SMBBA 0x80
	#define ALI1563_SMB_IOEN 1
	#define ALI1563_SMB_HOSTEN 2
	#define ALI1563_SMB_IOSIZE 16

	#define SMB_HST_STS (ali1563_smba + 0)
	#define SMB_HST_CNTL1 (ali1563_smba + 1)
	#define SMB_HST_CNTL2 (ali1563_smba + 2)
	#define SMB_HST_CMD (ali1563_smba + 3)
	#define SMB_HST_ADD (ali1563_smba + 4)
	#define SMB_HST_DAT0 (ali1563_smba + 5)
	#define SMB_HST_DAT1 (ali1563_smba + 6)
	#define SMB_BLK_DAT (ali1563_smba + 7)

	#define HST_STS_BUSY 0x01
	#define HST_STS_INTR 0x02
	#define HST_STS_DEVERR 0x04
	#define HST_STS_BUSERR 0x08
	#define HST_STS_FAIL 0x10
	#define HST_STS_DONE 0x80
	#define HST_STS_BAD 0x1c


	#define HST_CNTL1_TIMEOUT 0x80
	#define HST_CNTL1_LAST 0x40

	#define HST_CNTL2_KILL 0x04
	#define HST_CNTL2_START 0x40
	#define HST_CNTL2_QUICK 0x00
	#define HST_CNTL2_BYTE 0x01
	#define HST_CNTL2_BYTE_DATA 0x02
	#define HST_CNTL2_WORD_DATA 0x03
	#define HST_CNTL2_BLOCK 0x05


	#define HST_CNTL2_SIZEMASK 0x38

	static struct pci_driver ali1563_pci_driver;
	static unsigned short ali1563_smba;

	static int ali1563_transaction(struct i2c_adapter *a, int size)
	{
	u32 data;
	int timeout;
	int status = -EIO;

	dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
	"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
	inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
	inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
	inb_p(SMB_HST_DAT1));

	data = inb_p(SMB_HST_STS);
	if (data & HST_STS_BAD) {
	dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
	outb_p(data \| HST_STS_BAD, SMB_HST_STS);
	data = inb_p(SMB_HST_STS);
	if (data & HST_STS_BAD)
	return -EBUSY;
	}
	outb_p(inb_p(SMB_HST_CNTL2) \| HST_CNTL2_START, SMB_HST_CNTL2);

	timeout = ALI1563_MAX_TIMEOUT;
	do {
	msleep(1);
	} while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);

	dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
	"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
	inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
	inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
	inb_p(SMB_HST_DAT1));

	if (timeout && !(data & HST_STS_BAD))
	return 0;

	if (!timeout) {
	dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
	/* Issue 'kill' to host controller */
	outb_p(HST_CNTL2_KILL, SMB_HST_CNTL2);
	data = inb_p(SMB_HST_STS);
	status = -ETIMEDOUT;
	}

	/* device error - no response, ignore the autodetection case */
	if (data & HST_STS_DEVERR) {
	if (size != HST_CNTL2_QUICK)
	dev_err(&a->dev, "Device error!\n");
	status = -ENXIO;
	}
	/* bus collision */
	if (data & HST_STS_BUSERR) {
	dev_err(&a->dev, "Bus collision!\n");
	/* Issue timeout, hoping it helps */
	outb_p(HST_CNTL1_TIMEOUT, SMB_HST_CNTL1);
	}

	if (data & HST_STS_FAIL) {
	dev_err(&a->dev, "Cleaning fail after KILL!\n");
	outb_p(0x0, SMB_HST_CNTL2);
	}

	return status;
	}

	static int ali1563_block_start(struct i2c_adapter *a)
	{
	u32 data;
	int timeout;
	int status = -EIO;

	dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
	"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
	inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
	inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
	inb_p(SMB_HST_DAT1));

	data = inb_p(SMB_HST_STS);
	if (data & HST_STS_BAD) {
	dev_warn(&a->dev, "ali1563: Trying to reset busy device\n");
	outb_p(data \| HST_STS_BAD, SMB_HST_STS);
	data = inb_p(SMB_HST_STS);
	if (data & HST_STS_BAD)
	return -EBUSY;
	}

	/* Clear byte-ready bit */
	outb_p(data \| HST_STS_DONE, SMB_HST_STS);

	/* Start transaction and wait for byte-ready bit to be set */
	outb_p(inb_p(SMB_HST_CNTL2) \| HST_CNTL2_START, SMB_HST_CNTL2);

	timeout = ALI1563_MAX_TIMEOUT;
	do {
	msleep(1);
	} while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);

	dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
	"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
	inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
	inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
	inb_p(SMB_HST_DAT1));

	if (timeout && !(data & HST_STS_BAD))
	return 0;

	if (timeout == 0)
	status = -ETIMEDOUT;

	if (data & HST_STS_DEVERR)
	status = -ENXIO;

	dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
	timeout ? "" : "Timeout ",
	data & HST_STS_FAIL ? "Transaction Failed " : "",
	data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
	data & HST_STS_DEVERR ? "Device Error " : "",
	!(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
	return status;
	}

	static int ali1563_block(struct i2c_adapter *a,
	union i2c_smbus_data *data, u8 rw)
	{
	int i, len;
	int error = 0;

	/* Do we need this? */
	outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);

	if (rw == I2C_SMBUS_WRITE) {
	len = data->block[0];
	if (len < 1)
	len = 1;
	else if (len > 32)
	len = 32;
	outb_p(len, SMB_HST_DAT0);
	outb_p(data->block[1], SMB_BLK_DAT);
	} else
	len = 32;

	outb_p(inb_p(SMB_HST_CNTL2) \| HST_CNTL2_BLOCK, SMB_HST_CNTL2);

	for (i = 0; i < len; i++) {
	if (rw == I2C_SMBUS_WRITE) {
	outb_p(data->block[i + 1], SMB_BLK_DAT);
	error = ali1563_block_start(a);
	if (error)
	break;
	} else {
	error = ali1563_block_start(a);
	if (error)
	break;
	if (i == 0) {
	len = inb_p(SMB_HST_DAT0);
	if (len < 1)
	len = 1;
	else if (len > 32)
	len = 32;
	}
	data->block[i+1] = inb_p(SMB_BLK_DAT);
	}
	}
	/* Do we need this? */
	outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
	return error;
	}

	static s32 ali1563_access(struct i2c_adapter *a, u16 addr,
	unsigned short flags, char rw, u8 cmd,
	int size, union i2c_smbus_data *data)
	{
	int error = 0;
	int timeout;
	u32 reg;

	for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
	reg = inb_p(SMB_HST_STS);
	if (!(reg & HST_STS_BUSY))
	break;
	}
	if (!timeout)
	dev_warn(&a->dev, "SMBus not idle. HST_STS = %02x\n", reg);
	outb_p(0xff, SMB_HST_STS);

	/* Map the size to what the chip understands */
	switch (size) {
	case I2C_SMBUS_QUICK:
	size = HST_CNTL2_QUICK;
	break;
	case I2C_SMBUS_BYTE:
	size = HST_CNTL2_BYTE;
	break;
	case I2C_SMBUS_BYTE_DATA:
	size = HST_CNTL2_BYTE_DATA;
	break;
	case I2C_SMBUS_WORD_DATA:
	size = HST_CNTL2_WORD_DATA;
	break;
	case I2C_SMBUS_BLOCK_DATA:
	size = HST_CNTL2_BLOCK;
	break;
	default:
	dev_warn(&a->dev, "Unsupported transaction %d\n", size);
	error = -EOPNOTSUPP;
	goto Done;
	}

	outb_p(((addr & 0x7f) << 1) \| (rw & 0x01), SMB_HST_ADD);
	outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) \|
	(size << 3), SMB_HST_CNTL2);

	/* Write the command register */

	switch (size) {
	case HST_CNTL2_BYTE:
	if (rw == I2C_SMBUS_WRITE)
	/* Beware it uses DAT0 register and not CMD! */
	outb_p(cmd, SMB_HST_DAT0);
	break;
	case HST_CNTL2_BYTE_DATA:
	outb_p(cmd, SMB_HST_CMD);
	if (rw == I2C_SMBUS_WRITE)
	outb_p(data->byte, SMB_HST_DAT0);
	break;
	case HST_CNTL2_WORD_DATA:
	outb_p(cmd, SMB_HST_CMD);
	if (rw == I2C_SMBUS_WRITE) {
	outb_p(data->word & 0xff, SMB_HST_DAT0);
	outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
	}
	break;
	case HST_CNTL2_BLOCK:
	outb_p(cmd, SMB_HST_CMD);
	error = ali1563_block(a, data, rw);
	goto Done;
	}

	error = ali1563_transaction(a, size);
	if (error)
	goto Done;

	if ((rw == I2C_SMBUS_WRITE) \|\| (size == HST_CNTL2_QUICK))
	goto Done;

	switch (size) {
	case HST_CNTL2_BYTE: /* Result put in SMBHSTDAT0 */
	data->byte = inb_p(SMB_HST_DAT0);
	break;
	case HST_CNTL2_BYTE_DATA:
	data->byte = inb_p(SMB_HST_DAT0);
	break;
	case HST_CNTL2_WORD_DATA:
	data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
	break;
	}
	Done:
	return error;
	}

	static u32 ali1563_func(struct i2c_adapter *a)
	{
	return I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA \|
	I2C_FUNC_SMBUS_BLOCK_DATA;
	}


	static int ali1563_setup(struct pci_dev *dev)
	{
	u16 ctrl;

	pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);

	/* SMB I/O Base in high 12 bits and must be aligned with the
	* size of the I/O space. */
	ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
	if (!ali1563_smba) {
	dev_warn(&dev->dev, "ali1563_smba Uninitialized\n");
	goto Err;
	}

	/* Check if device is enabled */
	if (!(ctrl & ALI1563_SMB_HOSTEN)) {
	dev_warn(&dev->dev, "Host Controller not enabled\n");
	goto Err;
	}
	if (!(ctrl & ALI1563_SMB_IOEN)) {
	dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
	pci_write_config_word(dev, ALI1563_SMBBA,
	ctrl \| ALI1563_SMB_IOEN);
	pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
	if (!(ctrl & ALI1563_SMB_IOEN)) {
	dev_err(&dev->dev,
	"I/O space still not enabled, giving up\n");
	goto Err;
	}
	}

	if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
	ali1563_pci_driver.name))
	goto Err;

	if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
	ali1563_pci_driver.name)) {
	dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
	ali1563_smba);
	goto Err;
	}
	dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);

	return 0;
	Err:
	return -ENODEV;
	}

	static void ali1563_shutdown(struct pci_dev *dev)
	{
	release_region(ali1563_smba, ALI1563_SMB_IOSIZE);
	}

	static const struct i2c_algorithm ali1563_algorithm = {
	.smbus_xfer = ali1563_access,
	.functionality = ali1563_func,
	};

	static struct i2c_adapter ali1563_adapter = {
	.owner = THIS_MODULE,
	.class = I2C_CLASS_HWMON \| I2C_CLASS_SPD,
	.algo = &ali1563_algorithm,
	};

	static int ali1563_probe(struct pci_dev *dev,
	const struct pci_device_id *id_table)
	{
	int error;

	error = ali1563_setup(dev);
	if (error)
	goto exit;
	ali1563_adapter.dev.parent = &dev->dev;
	snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
	"SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
	error = i2c_add_adapter(&ali1563_adapter);
	if (error)
	goto exit_shutdown;
	return 0;

	exit_shutdown:
	ali1563_shutdown(dev);
	exit:
	dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
	return error;
	}

	static void ali1563_remove(struct pci_dev *dev)
	{
	i2c_del_adapter(&ali1563_adapter);
	ali1563_shutdown(dev);
	}

	static const struct pci_device_id ali1563_id_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
	{},
	};

	MODULE_DEVICE_TABLE(pci, ali1563_id_table);

	static struct pci_driver ali1563_pci_driver = {
	.name = "ali1563_smbus",
	.id_table = ali1563_id_table,
	.probe = ali1563_probe,
	.remove = ali1563_remove,
	};

	module_pci_driver(ali1563_pci_driver);

	MODULE_LICENSE("GPL");