[linux-block.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);
			if ((error = ali1563_block_start(a)))
				break;
		} else {
			if ((error = ali1563_block_start(a)))
				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--) {
		if (!(reg = inb_p(SMB_HST_STS) & 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;
	}

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

	if ((error = ali1563_setup(dev)))
		goto exit;
	ali1563_adapter.dev.parent = &dev->dev;
	snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
		 "SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
	if ((error = i2c_add_adapter(&ali1563_adapter)))
		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
4a4e5787	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");
1da177e4 LT	81	outb_p(data \| HST_STS_BAD,SMB_HST_STS);
	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 M	102	if (!timeout) {
4a4e5787 M	103	dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
1da177e4 LT	104	/* Issue 'kill' to host controller */
1da177e4 LT	105	outb_p(HST_CNTL2_KILL,SMB_HST_CNTL2);
4a4e5787	106	data = inb_p(SMB_HST_STS);
97140342	107	status = -ETIMEDOUT;
4a4e5787 M	108	}
	109
	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 M	116	/* bus collision */
	117	if (data & HST_STS_BUSERR) {
	118	dev_err(&a->dev, "Bus collision!\n");
	119	/* Issue timeout, hoping it helps */
1da177e4	120	outb_p(HST_CNTL1_TIMEOUT,SMB_HST_CNTL1);
4a4e5787 M	121	}
	122
	123	if (data & HST_STS_FAIL) {
	124	dev_err(&a->dev, "Cleaning fail after KILL!\n");
	125	outb_p(0x0,SMB_HST_CNTL2);
	126	}
	127
97140342	128	return status;
1da177e4 LT	129	}
	130
	131	static int ali1563_block_start(struct i2c_adapter * a)
	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) {
	145	dev_warn(&a->dev,"ali1563: Trying to reset busy device\n");
	146	outb_p(data \| HST_STS_BAD,SMB_HST_STS);
	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	}
	186
	187	static int ali1563_block(struct i2c_adapter * a, union i2c_smbus_data * data, u8 rw)
	188	{
	189	int i, len;
	190	int error = 0;
	191
	192	/* Do we need this? */
	193	outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
	194
	195	if (rw == I2C_SMBUS_WRITE) {
	196	len = data->block[0];
	197	if (len < 1)
	198	len = 1;
	199	else if (len > 32)
	200	len = 32;
	201	outb_p(len,SMB_HST_DAT0);
	202	outb_p(data->block[1],SMB_BLK_DAT);
	203	} else
	204	len = 32;
	205
	206	outb_p(inb_p(SMB_HST_CNTL2) \| HST_CNTL2_BLOCK, SMB_HST_CNTL2);
	207
	208	for (i = 0; i < len; i++) {
	209	if (rw == I2C_SMBUS_WRITE) {
	210	outb_p(data->block[i + 1], SMB_BLK_DAT);
	211	if ((error = ali1563_block_start(a)))
	212	break;
	213	} else {
	214	if ((error = ali1563_block_start(a)))
	215	break;
	216	if (i == 0) {
	217	len = inb_p(SMB_HST_DAT0);
	218	if (len < 1)
	219	len = 1;
	220	else if (len > 32)
	221	len = 32;
	222	}
	223	data->block[i+1] = inb_p(SMB_BLK_DAT);
	224	}
	225	}
	226	/* Do we need this? */
	227	outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
	228	return error;
	229	}
	230
	231	static s32 ali1563_access(struct i2c_adapter * a, u16 addr,
	232	unsigned short flags, char rw, u8 cmd,
	233	int size, union i2c_smbus_data * data)
	234	{
	235	int error = 0;
	236	int timeout;
	237	u32 reg;
	238
	239	for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
	240	if (!(reg = inb_p(SMB_HST_STS) & HST_STS_BUSY))
	241	break;
	242	}
	243	if (!timeout)
	244	dev_warn(&a->dev,"SMBus not idle. HST_STS = %02x\n",reg);
	245	outb_p(0xff,SMB_HST_STS);
	246
	247	/* Map the size to what the chip understands */
	248	switch (size) {
1da177e4 LT	249	case I2C_SMBUS_QUICK:
	250	size = HST_CNTL2_QUICK;
	251	break;
	252	case I2C_SMBUS_BYTE:
	253	size = HST_CNTL2_BYTE;
	254	break;
	255	case I2C_SMBUS_BYTE_DATA:
	256	size = HST_CNTL2_BYTE_DATA;
	257	break;
	258	case I2C_SMBUS_WORD_DATA:
	259	size = HST_CNTL2_WORD_DATA;
	260	break;
	261	case I2C_SMBUS_BLOCK_DATA:
	262	size = HST_CNTL2_BLOCK;
	263	break;
ac7fc4fb JD	264	default:
	265	dev_warn(&a->dev, "Unsupported transaction %d\n", size);
	266	error = -EOPNOTSUPP;
	267	goto Done;
1da177e4 LT	268	}
	269
	270	outb_p(((addr & 0x7f) << 1) \| (rw & 0x01), SMB_HST_ADD);
4a4e5787	271	outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) \| (size << 3), SMB_HST_CNTL2);
1da177e4 LT	272
1da177e4 LT	273	/* Write the command register */
4a4e5787	274
1da177e4 LT	275	switch(size) {
	276	case HST_CNTL2_BYTE:
	277	if (rw== I2C_SMBUS_WRITE)
4a4e5787 M	278	/* Beware it uses DAT0 register and not CMD! */
4a4e5787 M	279	outb_p(cmd, SMB_HST_DAT0);
1da177e4 LT	280	break;
	281	case HST_CNTL2_BYTE_DATA:
	282	outb_p(cmd, SMB_HST_CMD);
	283	if (rw == I2C_SMBUS_WRITE)
	284	outb_p(data->byte, SMB_HST_DAT0);
	285	break;
	286	case HST_CNTL2_WORD_DATA:
	287	outb_p(cmd, SMB_HST_CMD);
	288	if (rw == I2C_SMBUS_WRITE) {
	289	outb_p(data->word & 0xff, SMB_HST_DAT0);
	290	outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
	291	}
	292	break;
	293	case HST_CNTL2_BLOCK:
	294	outb_p(cmd, SMB_HST_CMD);
	295	error = ali1563_block(a,data,rw);
	296	goto Done;
	297	}
	298
4a4e5787	299	if ((error = ali1563_transaction(a, size)))
1da177e4 LT	300	goto Done;
	301
	302	if ((rw == I2C_SMBUS_WRITE) \|\| (size == HST_CNTL2_QUICK))
	303	goto Done;
	304
	305	switch (size) {
	306	case HST_CNTL2_BYTE: /* Result put in SMBHSTDAT0 */
	307	data->byte = inb_p(SMB_HST_DAT0);
	308	break;
	309	case HST_CNTL2_BYTE_DATA:
	310	data->byte = inb_p(SMB_HST_DAT0);
	311	break;
	312	case HST_CNTL2_WORD_DATA:
	313	data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
	314	break;
	315	}
	316	Done:
	317	return error;
	318	}
	319
	320	static u32 ali1563_func(struct i2c_adapter * a)
	321	{
	322	return I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
	323	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA \|
	324	I2C_FUNC_SMBUS_BLOCK_DATA;
	325	}
	326
	327
0b255e92	328	static int ali1563_setup(struct pci_dev *dev)
1da177e4 LT	329	{
	330	u16 ctrl;
	331
	332	pci_read_config_word(dev,ALI1563_SMBBA,&ctrl);
1da177e4	333
1da177e4 LT	334	/* SMB I/O Base in high 12 bits and must be aligned with the
	335	* size of the I/O space. */
	336	ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
	337	if (!ali1563_smba) {
	338	dev_warn(&dev->dev,"ali1563_smba Uninitialized\n");
	339	goto Err;
	340	}
849be516 JD	341
	342	/* Check if device is enabled */
	343	if (!(ctrl & ALI1563_SMB_HOSTEN)) {
	344	dev_warn(&dev->dev, "Host Controller not enabled\n");
	345	goto Err;
	346	}
	347	if (!(ctrl & ALI1563_SMB_IOEN)) {
	348	dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
	349	pci_write_config_word(dev, ALI1563_SMBBA,
	350	ctrl \| ALI1563_SMB_IOEN);
	351	pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
	352	if (!(ctrl & ALI1563_SMB_IOEN)) {
	353	dev_err(&dev->dev, "I/O space still not enabled, "
	354	"giving up\n");
	355	goto Err;
	356	}
	357	}
	358
54fb4a05 JD	359	if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
	360	ali1563_pci_driver.name))
	361	goto Err;
	362
d6072f84 JD	363	if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
d6072f84 JD	364	ali1563_pci_driver.name)) {
69735698 JD	365	dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
69735698 JD	366	ali1563_smba);
1da177e4 LT	367	goto Err;
1da177e4 LT	368	}
69735698	369	dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);
1da177e4 LT	370
	371	return 0;
	372	Err:
	373	return -ENODEV;
	374	}
	375
	376	static void ali1563_shutdown(struct pci_dev *dev)
	377	{
	378	release_region(ali1563_smba,ALI1563_SMB_IOSIZE);
	379	}
	380
8f9082c5	381	static const struct i2c_algorithm ali1563_algorithm = {
1da177e4 LT	382	.smbus_xfer = ali1563_access,
	383	.functionality = ali1563_func,
	384	};
	385
	386	static struct i2c_adapter ali1563_adapter = {
	387	.owner = THIS_MODULE,
3401b2ff	388	.class = I2C_CLASS_HWMON \| I2C_CLASS_SPD,
1da177e4 LT	389	.algo = &ali1563_algorithm,
	390	};
	391
0b255e92 BP	392	static int ali1563_probe(struct pci_dev *dev,
0b255e92 BP	393	const struct pci_device_id *id_table)
1da177e4 LT	394	{
	395	int error;
	396
	397	if ((error = ali1563_setup(dev)))
69735698	398	goto exit;
1da177e4	399	ali1563_adapter.dev.parent = &dev->dev;
66c7acf6 JD	400	snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
66c7acf6 JD	401	"SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
1da177e4	402	if ((error = i2c_add_adapter(&ali1563_adapter)))
69735698 JD	403	goto exit_shutdown;
	404	return 0;
	405
	406	exit_shutdown:
	407	ali1563_shutdown(dev);
	408	exit:
	409	dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
1da177e4 LT	410	return error;
	411	}
	412
0b255e92	413	static void ali1563_remove(struct pci_dev *dev)
1da177e4 LT	414	{
	415	i2c_del_adapter(&ali1563_adapter);
	416	ali1563_shutdown(dev);
	417	}
	418
392debf1	419	static const struct pci_device_id ali1563_id_table[] = {
1da177e4 LT	420	{ PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
	421	{},
	422	};
	423
	424	MODULE_DEVICE_TABLE (pci, ali1563_id_table);
	425
	426	static struct pci_driver ali1563_pci_driver = {
d6072f84	427	.name = "ali1563_smbus",
1da177e4 LT	428	.id_table = ali1563_id_table,
1da177e4 LT	429	.probe = ali1563_probe,
0b255e92	430	.remove = ali1563_remove,
1da177e4 LT	431	};
1da177e4 LT	432
56f21788	433	module_pci_driver(ali1563_pci_driver);
1da177e4 LT	434
1da177e4 LT	435	MODULE_LICENSE("GPL");