[mirror_ubuntu-zesty-kernel.git] / drivers / i2c / busses / i2c-ali1563.c

/**
 *	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.
 *
 *	This file is released under the GPLv2
 */

#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");
Commit	Line	Data
1da177e4 LT	1	/**
	2	* i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
	3	*
	4	* Copyright (C) 2004 Patrick Mochel
7188cc66	5	* 2005 Rudolf Marek <r.marek@assembler.cz>
1da177e4 LT	6	*
	7	* The 1563 southbridge is deceptively similar to the 1533, with a
	8	* few notable exceptions. One of those happens to be the fact they
	9	* upgraded the i2c core to be 2.0 compliant, and happens to be almost
	10	* identical to the i2c controller found in the Intel 801 south
	11	* bridges.
	12	*
	13	* This driver is based on a mix of the 15x3, 1535, and i801 drivers,
	14	* with a little help from the ALi 1563 spec.
	15	*
	16	* This file is released under the GPLv2
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/delay.h>
	21	#include <linux/i2c.h>
	22	#include <linux/pci.h>
54fb4a05	23	#include <linux/acpi.h>
1da177e4 LT	24
	25	#define ALI1563_MAX_TIMEOUT 500
	26	#define ALI1563_SMBBA 0x80
	27	#define ALI1563_SMB_IOEN 1
	28	#define ALI1563_SMB_HOSTEN 2
	29	#define ALI1563_SMB_IOSIZE 16
	30
	31	#define SMB_HST_STS (ali1563_smba + 0)
	32	#define SMB_HST_CNTL1 (ali1563_smba + 1)
	33	#define SMB_HST_CNTL2 (ali1563_smba + 2)
	34	#define SMB_HST_CMD (ali1563_smba + 3)
	35	#define SMB_HST_ADD (ali1563_smba + 4)
	36	#define SMB_HST_DAT0 (ali1563_smba + 5)
	37	#define SMB_HST_DAT1 (ali1563_smba + 6)
	38	#define SMB_BLK_DAT (ali1563_smba + 7)
	39
	40	#define HST_STS_BUSY 0x01
	41	#define HST_STS_INTR 0x02
	42	#define HST_STS_DEVERR 0x04
	43	#define HST_STS_BUSERR 0x08
	44	#define HST_STS_FAIL 0x10
	45	#define HST_STS_DONE 0x80
	46	#define HST_STS_BAD 0x1c
	47
	48
	49	#define HST_CNTL1_TIMEOUT 0x80
	50	#define HST_CNTL1_LAST 0x40
	51
	52	#define HST_CNTL2_KILL 0x04
	53	#define HST_CNTL2_START 0x40
	54	#define HST_CNTL2_QUICK 0x00
	55	#define HST_CNTL2_BYTE 0x01
	56	#define HST_CNTL2_BYTE_DATA 0x02
	57	#define HST_CNTL2_WORD_DATA 0x03
	58	#define HST_CNTL2_BLOCK 0x05
	59
	60
4a4e5787	61	#define HST_CNTL2_SIZEMASK 0x38
1da177e4	62
d6072f84	63	static struct pci_driver ali1563_pci_driver;
1da177e4 LT	64	static unsigned short ali1563_smba;
1da177e4 LT	65
482116ba	66	static int ali1563_transaction(struct i2c_adapter *a, int size)
1da177e4 LT	67	{
	68	u32 data;
	69	int timeout;
97140342	70	int status = -EIO;
1da177e4 LT	71
	72	dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
	73	"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
	74	inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
	75	inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
	76	inb_p(SMB_HST_DAT1));
	77
	78	data = inb_p(SMB_HST_STS);
	79	if (data & HST_STS_BAD) {
4a4e5787	80	dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
482116ba	81	outb_p(data \| HST_STS_BAD, SMB_HST_STS);
1da177e4 LT	82	data = inb_p(SMB_HST_STS);
	83	if (data & HST_STS_BAD)
	84	return -EBUSY;
	85	}
	86	outb_p(inb_p(SMB_HST_CNTL2) \| HST_CNTL2_START, SMB_HST_CNTL2);
	87
	88	timeout = ALI1563_MAX_TIMEOUT;
7d53e79f	89	do {
1da177e4	90	msleep(1);
7d53e79f	91	} while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);
1da177e4 LT	92
	93	dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
	94	"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
	95	inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
	96	inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
	97	inb_p(SMB_HST_DAT1));
	98
	99	if (timeout && !(data & HST_STS_BAD))
	100	return 0;
1da177e4	101
4a4e5787 RM	102	if (!timeout) {
4a4e5787 RM	103	dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
1da177e4	104	/* Issue 'kill' to host controller */
482116ba	105	outb_p(HST_CNTL2_KILL, SMB_HST_CNTL2);
4a4e5787	106	data = inb_p(SMB_HST_STS);
97140342	107	status = -ETIMEDOUT;
482116ba	108	}
4a4e5787 RM	109
4a4e5787 RM	110	/* device error - no response, ignore the autodetection case */
97140342 DB	111	if (data & HST_STS_DEVERR) {
	112	if (size != HST_CNTL2_QUICK)
	113	dev_err(&a->dev, "Device error!\n");
	114	status = -ENXIO;
4a4e5787	115	}
4a4e5787 RM	116	/* bus collision */
	117	if (data & HST_STS_BUSERR) {
	118	dev_err(&a->dev, "Bus collision!\n");
	119	/* Issue timeout, hoping it helps */
482116ba	120	outb_p(HST_CNTL1_TIMEOUT, SMB_HST_CNTL1);
4a4e5787 RM	121	}
	122
	123	if (data & HST_STS_FAIL) {
	124	dev_err(&a->dev, "Cleaning fail after KILL!\n");
482116ba	125	outb_p(0x0, SMB_HST_CNTL2);
4a4e5787 RM	126	}
4a4e5787 RM	127
97140342	128	return status;
1da177e4 LT	129	}
1da177e4 LT	130
482116ba	131	static int ali1563_block_start(struct i2c_adapter *a)
1da177e4 LT	132	{
	133	u32 data;
	134	int timeout;
97140342	135	int status = -EIO;
1da177e4 LT	136
	137	dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
	138	"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
	139	inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
	140	inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
	141	inb_p(SMB_HST_DAT1));
	142
	143	data = inb_p(SMB_HST_STS);
	144	if (data & HST_STS_BAD) {
482116ba RL	145	dev_warn(&a->dev, "ali1563: Trying to reset busy device\n");
482116ba RL	146	outb_p(data \| HST_STS_BAD, SMB_HST_STS);
1da177e4 LT	147	data = inb_p(SMB_HST_STS);
	148	if (data & HST_STS_BAD)
	149	return -EBUSY;
	150	}
	151
	152	/* Clear byte-ready bit */
	153	outb_p(data \| HST_STS_DONE, SMB_HST_STS);
	154
	155	/* Start transaction and wait for byte-ready bit to be set */
	156	outb_p(inb_p(SMB_HST_CNTL2) \| HST_CNTL2_START, SMB_HST_CNTL2);
	157
	158	timeout = ALI1563_MAX_TIMEOUT;
7d53e79f	159	do {
1da177e4	160	msleep(1);
7d53e79f	161	} while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);
1da177e4 LT	162
	163	dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
	164	"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
	165	inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
	166	inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
	167	inb_p(SMB_HST_DAT1));
	168
	169	if (timeout && !(data & HST_STS_BAD))
	170	return 0;
97140342 DB	171
	172	if (timeout == 0)
	173	status = -ETIMEDOUT;
	174
	175	if (data & HST_STS_DEVERR)
	176	status = -ENXIO;
	177
4a4e5787	178	dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
97140342	179	timeout ? "" : "Timeout ",
1da177e4 LT	180	data & HST_STS_FAIL ? "Transaction Failed " : "",
	181	data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
	182	data & HST_STS_DEVERR ? "Device Error " : "",
	183	!(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
97140342	184	return status;
1da177e4 LT	185	}
1da177e4 LT	186
482116ba RL	187	static int ali1563_block(struct i2c_adapter *a,
482116ba RL	188	union i2c_smbus_data *data, u8 rw)
1da177e4 LT	189	{
	190	int i, len;
	191	int error = 0;
	192
	193	/* Do we need this? */
482116ba	194	outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
1da177e4 LT	195
	196	if (rw == I2C_SMBUS_WRITE) {
	197	len = data->block[0];
	198	if (len < 1)
	199	len = 1;
	200	else if (len > 32)
	201	len = 32;
482116ba RL	202	outb_p(len, SMB_HST_DAT0);
482116ba RL	203	outb_p(data->block[1], SMB_BLK_DAT);
1da177e4 LT	204	} else
	205	len = 32;
	206
	207	outb_p(inb_p(SMB_HST_CNTL2) \| HST_CNTL2_BLOCK, SMB_HST_CNTL2);
	208
	209	for (i = 0; i < len; i++) {
	210	if (rw == I2C_SMBUS_WRITE) {
	211	outb_p(data->block[i + 1], SMB_BLK_DAT);
482116ba RL	212	error = ali1563_block_start(a);
482116ba RL	213	if (error)
1da177e4 LT	214	break;
1da177e4 LT	215	} else {
482116ba RL	216	error = ali1563_block_start(a);
482116ba RL	217	if (error)
1da177e4 LT	218	break;
	219	if (i == 0) {
	220	len = inb_p(SMB_HST_DAT0);
	221	if (len < 1)
	222	len = 1;
	223	else if (len > 32)
	224	len = 32;
	225	}
	226	data->block[i+1] = inb_p(SMB_BLK_DAT);
	227	}
	228	}
	229	/* Do we need this? */
482116ba	230	outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
1da177e4 LT	231	return error;
	232	}
	233
482116ba	234	static s32 ali1563_access(struct i2c_adapter *a, u16 addr,
1da177e4	235	unsigned short flags, char rw, u8 cmd,
482116ba	236	int size, union i2c_smbus_data *data)
1da177e4 LT	237	{
	238	int error = 0;
	239	int timeout;
	240	u32 reg;
	241
	242	for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
482116ba RL	243	reg = inb_p(SMB_HST_STS);
482116ba RL	244	if (!(reg & HST_STS_BUSY))
1da177e4 LT	245	break;
	246	}
	247	if (!timeout)
482116ba RL	248	dev_warn(&a->dev, "SMBus not idle. HST_STS = %02x\n", reg);
482116ba RL	249	outb_p(0xff, SMB_HST_STS);
1da177e4 LT	250
	251	/* Map the size to what the chip understands */
	252	switch (size) {
1da177e4 LT	253	case I2C_SMBUS_QUICK:
	254	size = HST_CNTL2_QUICK;
	255	break;
	256	case I2C_SMBUS_BYTE:
	257	size = HST_CNTL2_BYTE;
	258	break;
	259	case I2C_SMBUS_BYTE_DATA:
	260	size = HST_CNTL2_BYTE_DATA;
	261	break;
	262	case I2C_SMBUS_WORD_DATA:
	263	size = HST_CNTL2_WORD_DATA;
	264	break;
	265	case I2C_SMBUS_BLOCK_DATA:
	266	size = HST_CNTL2_BLOCK;
	267	break;
ac7fc4fb JD	268	default:
	269	dev_warn(&a->dev, "Unsupported transaction %d\n", size);
	270	error = -EOPNOTSUPP;
	271	goto Done;
1da177e4 LT	272	}
	273
	274	outb_p(((addr & 0x7f) << 1) \| (rw & 0x01), SMB_HST_ADD);
482116ba RL	275	outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) \|
482116ba RL	276	(size << 3), SMB_HST_CNTL2);
1da177e4 LT	277
1da177e4 LT	278	/* Write the command register */
4a4e5787	279
482116ba	280	switch (size) {
1da177e4	281	case HST_CNTL2_BYTE:
482116ba	282	if (rw == I2C_SMBUS_WRITE)
4a4e5787 RM	283	/* Beware it uses DAT0 register and not CMD! */
4a4e5787 RM	284	outb_p(cmd, SMB_HST_DAT0);
1da177e4 LT	285	break;
	286	case HST_CNTL2_BYTE_DATA:
	287	outb_p(cmd, SMB_HST_CMD);
	288	if (rw == I2C_SMBUS_WRITE)
	289	outb_p(data->byte, SMB_HST_DAT0);
	290	break;
	291	case HST_CNTL2_WORD_DATA:
	292	outb_p(cmd, SMB_HST_CMD);
	293	if (rw == I2C_SMBUS_WRITE) {
	294	outb_p(data->word & 0xff, SMB_HST_DAT0);
	295	outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
	296	}
	297	break;
	298	case HST_CNTL2_BLOCK:
	299	outb_p(cmd, SMB_HST_CMD);
482116ba	300	error = ali1563_block(a, data, rw);
1da177e4 LT	301	goto Done;
	302	}
	303
482116ba RL	304	error = ali1563_transaction(a, size);
482116ba RL	305	if (error)
1da177e4 LT	306	goto Done;
	307
	308	if ((rw == I2C_SMBUS_WRITE) \|\| (size == HST_CNTL2_QUICK))
	309	goto Done;
	310
	311	switch (size) {
	312	case HST_CNTL2_BYTE: /* Result put in SMBHSTDAT0 */
	313	data->byte = inb_p(SMB_HST_DAT0);
	314	break;
	315	case HST_CNTL2_BYTE_DATA:
	316	data->byte = inb_p(SMB_HST_DAT0);
	317	break;
	318	case HST_CNTL2_WORD_DATA:
	319	data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
	320	break;
	321	}
	322	Done:
	323	return error;
	324	}
	325
482116ba	326	static u32 ali1563_func(struct i2c_adapter *a)
1da177e4 LT	327	{
	328	return I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
	329	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA \|
	330	I2C_FUNC_SMBUS_BLOCK_DATA;
	331	}
	332
	333
0b255e92	334	static int ali1563_setup(struct pci_dev *dev)
1da177e4 LT	335	{
	336	u16 ctrl;
	337
482116ba	338	pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
1da177e4	339
1da177e4 LT	340	/* SMB I/O Base in high 12 bits and must be aligned with the
	341	* size of the I/O space. */
	342	ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
	343	if (!ali1563_smba) {
482116ba	344	dev_warn(&dev->dev, "ali1563_smba Uninitialized\n");
1da177e4 LT	345	goto Err;
1da177e4 LT	346	}
849be516 JD	347
	348	/* Check if device is enabled */
	349	if (!(ctrl & ALI1563_SMB_HOSTEN)) {
	350	dev_warn(&dev->dev, "Host Controller not enabled\n");
	351	goto Err;
	352	}
	353	if (!(ctrl & ALI1563_SMB_IOEN)) {
	354	dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
	355	pci_write_config_word(dev, ALI1563_SMBBA,
	356	ctrl \| ALI1563_SMB_IOEN);
	357	pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
	358	if (!(ctrl & ALI1563_SMB_IOEN)) {
482116ba RL	359	dev_err(&dev->dev,
482116ba RL	360	"I/O space still not enabled, giving up\n");
849be516 JD	361	goto Err;
	362	}
	363	}
	364
54fb4a05 JD	365	if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
	366	ali1563_pci_driver.name))
	367	goto Err;
	368
d6072f84 JD	369	if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
d6072f84 JD	370	ali1563_pci_driver.name)) {
69735698 JD	371	dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
69735698 JD	372	ali1563_smba);
1da177e4 LT	373	goto Err;
1da177e4 LT	374	}
69735698	375	dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);
1da177e4 LT	376
	377	return 0;
	378	Err:
	379	return -ENODEV;
	380	}
	381
	382	static void ali1563_shutdown(struct pci_dev *dev)
	383	{
482116ba	384	release_region(ali1563_smba, ALI1563_SMB_IOSIZE);
1da177e4 LT	385	}
1da177e4 LT	386
8f9082c5	387	static const struct i2c_algorithm ali1563_algorithm = {
1da177e4 LT	388	.smbus_xfer = ali1563_access,
	389	.functionality = ali1563_func,
	390	};
	391
	392	static struct i2c_adapter ali1563_adapter = {
	393	.owner = THIS_MODULE,
3401b2ff	394	.class = I2C_CLASS_HWMON \| I2C_CLASS_SPD,
1da177e4 LT	395	.algo = &ali1563_algorithm,
	396	};
	397
0b255e92 BP	398	static int ali1563_probe(struct pci_dev *dev,
0b255e92 BP	399	const struct pci_device_id *id_table)
1da177e4 LT	400	{
	401	int error;
	402
482116ba RL	403	error = ali1563_setup(dev);
482116ba RL	404	if (error)
69735698	405	goto exit;
1da177e4	406	ali1563_adapter.dev.parent = &dev->dev;
66c7acf6 JD	407	snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
66c7acf6 JD	408	"SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
482116ba RL	409	error = i2c_add_adapter(&ali1563_adapter);
482116ba RL	410	if (error)
69735698 JD	411	goto exit_shutdown;
	412	return 0;
	413
	414	exit_shutdown:
	415	ali1563_shutdown(dev);
	416	exit:
	417	dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
1da177e4 LT	418	return error;
	419	}
	420
0b255e92	421	static void ali1563_remove(struct pci_dev *dev)
1da177e4 LT	422	{
	423	i2c_del_adapter(&ali1563_adapter);
	424	ali1563_shutdown(dev);
	425	}
	426
392debf1	427	static const struct pci_device_id ali1563_id_table[] = {
1da177e4 LT	428	{ PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
	429	{},
	430	};
	431
482116ba	432	MODULE_DEVICE_TABLE(pci, ali1563_id_table);
1da177e4 LT	433
1da177e4 LT	434	static struct pci_driver ali1563_pci_driver = {
482116ba	435	.name = "ali1563_smbus",
1da177e4	436	.id_table = ali1563_id_table,
482116ba	437	.probe = ali1563_probe,
0b255e92	438	.remove = ali1563_remove,
1da177e4 LT	439	};
1da177e4 LT	440
56f21788	441	module_pci_driver(ali1563_pci_driver);
1da177e4 LT	442
1da177e4 LT	443	MODULE_LICENSE("GPL");