/** *	i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge * *	Copyright (C) 2004 Patrick Mochel *		      2005 Rudolf Marek <r.marek@sh.cvut.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/init.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	0x38static 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;	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); 	}	/* device error - no response, ignore the autodetection case */	if ((data & HST_STS_DEVERR) && (size != HST_CNTL2_QUICK)) {		dev_err(&a->dev, "Device error!\n");	}	/* 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 -1;}static int ali1563_block_start(struct i2c_adapter * a){	u32 data;	int timeout;	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;	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 -1;}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_PROC_CALL:		dev_err(&a->dev, "I2C_SMBUS_PROC_CALL not supported!\n");		error = -EINVAL;		break;	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;	}	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 void ali1563_enable(struct pci_dev * dev){	u16 ctrl;	pci_read_config_word(dev,ALI1563_SMBBA,&ctrl);	ctrl |= 0x7;	pci_write_config_word(dev,ALI1563_SMBBA,ctrl);}static int __devinit ali1563_setup(struct pci_dev * dev){	u16 ctrl;	pci_read_config_word(dev,ALI1563_SMBBA,&ctrl);	printk("ali1563: SMBus control = %04x\n",ctrl);	/* Check if device is even enabled first */	if (!(ctrl & ALI1563_SMB_IOEN)) {		dev_warn(&dev->dev,"I/O space not enabled, trying manually\n");		ali1563_enable(dev);	}	if (!(ctrl & ALI1563_SMB_IOEN)) {		dev_warn(&dev->dev,"I/O space still not enabled, giving up\n");		goto Err;	}	if (!(ctrl & ALI1563_SMB_HOSTEN)) {		dev_warn(&dev->dev,"Host Controller not enabled\n");		goto Err;	}	/* 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;	}	if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,			    ali1563_pci_driver.name)) {		dev_warn(&dev->dev,"Could not allocate I/O space");		goto Err;	}	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,	.algo	= &ali1563_algorithm,};static int __devinit ali1563_probe(struct pci_dev * dev,				const struct pci_device_id * id_table){	int error;	if ((error = ali1563_setup(dev)))		return error;	ali1563_adapter.dev.parent = &dev->dev;	sprintf(ali1563_adapter.name,"SMBus ALi 1563 Adapter @ %04x",		ali1563_smba);	if ((error = i2c_add_adapter(&ali1563_adapter)))		ali1563_shutdown(dev);	printk("%s: Returning %d\n",__FUNCTION__,error);	return error;}static void __devexit ali1563_remove(struct pci_dev * dev){	i2c_del_adapter(&ali1563_adapter);	ali1563_shutdown(dev);}static struct pci_device_id __devinitdata 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		= __devexit_p(ali1563_remove),};static int __init ali1563_init(void){	return pci_register_driver(&ali1563_pci_driver);}module_init(ali1563_init);static void __exit ali1563_exit(void){	pci_unregister_driver(&ali1563_pci_driver);}module_exit(ali1563_exit);MODULE_LICENSE("GPL");