[linux-2.6-block.git] / drivers / i2c / busses / i2c-nforce2.c

/*
    SMBus driver for nVidia nForce2 MCP

    Added nForce3 Pro 150  Thomas Leibold <thomas@plx.com>,
	Ported to 2.5 Patrick Dreker <patrick@dreker.de>,
    Copyright (c) 2003  Hans-Frieder Vogt <hfvogt@arcor.de>,
    Based on
    SMBus 2.0 driver for AMD-8111 IO-Hub
    Copyright (c) 2002 Vojtech Pavlik

    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.
*/

/*
    SUPPORTED DEVICES		PCI ID
    nForce2 MCP			0064
    nForce2 Ultra 400 MCP	0084
    nForce3 Pro150 MCP		00D4
    nForce3 250Gb MCP		00E4
    nForce4 MCP			0052

    This driver supports the 2 SMBuses that are included in the MCP of the
    nForce2/3/4 chipsets.
*/

/* Note: we assume there can only be one nForce2, with two SMBus interfaces */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <asm/io.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@arcor.de>");
MODULE_DESCRIPTION("nForce2 SMBus driver");


struct nforce2_smbus {
	struct pci_dev *dev;
	struct i2c_adapter adapter;
	int base;
	int size;
};


/*
 * nVidia nForce2 SMBus control register definitions
 */
#define NFORCE_PCI_SMB1	0x50
#define NFORCE_PCI_SMB2	0x54


/*
 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
 */
#define NVIDIA_SMB_PRTCL	(smbus->base + 0x00)	/* protocol, PEC */
#define NVIDIA_SMB_STS		(smbus->base + 0x01)	/* status */
#define NVIDIA_SMB_ADDR		(smbus->base + 0x02)	/* address */
#define NVIDIA_SMB_CMD		(smbus->base + 0x03)	/* command */
#define NVIDIA_SMB_DATA		(smbus->base + 0x04)	/* 32 data registers */
#define NVIDIA_SMB_BCNT		(smbus->base + 0x24)	/* number of data bytes */
#define NVIDIA_SMB_ALRM_A	(smbus->base + 0x25)	/* alarm address */
#define NVIDIA_SMB_ALRM_D	(smbus->base + 0x26)	/* 2 bytes alarm data */

#define NVIDIA_SMB_STS_DONE	0x80
#define NVIDIA_SMB_STS_ALRM	0x40
#define NVIDIA_SMB_STS_RES	0x20
#define NVIDIA_SMB_STS_STATUS	0x1f

#define NVIDIA_SMB_PRTCL_WRITE			0x00
#define NVIDIA_SMB_PRTCL_READ			0x01
#define NVIDIA_SMB_PRTCL_QUICK			0x02
#define NVIDIA_SMB_PRTCL_BYTE			0x04
#define NVIDIA_SMB_PRTCL_BYTE_DATA		0x06
#define NVIDIA_SMB_PRTCL_WORD_DATA		0x08
#define NVIDIA_SMB_PRTCL_BLOCK_DATA		0x0a
#define NVIDIA_SMB_PRTCL_PROC_CALL		0x0c
#define NVIDIA_SMB_PRTCL_BLOCK_PROC_CALL	0x0d
#define NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA		0x4a
#define NVIDIA_SMB_PRTCL_PEC			0x80

static struct pci_driver nforce2_driver;

static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,
		       unsigned short flags, char read_write,
		       u8 command, int size, union i2c_smbus_data *data);
static u32 nforce2_func(struct i2c_adapter *adapter);


static struct i2c_algorithm smbus_algorithm = {
	.smbus_xfer = nforce2_access,
	.functionality = nforce2_func,
};

static struct i2c_adapter nforce2_adapter = {
	.owner          = THIS_MODULE,
	.class          = I2C_CLASS_HWMON,
	.algo           = &smbus_algorithm,
};

/* Return -1 on error. See smbus.h for more information */
static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
		unsigned short flags, char read_write,
		u8 command, int size, union i2c_smbus_data * data)
{
	struct nforce2_smbus *smbus = adap->algo_data;
	unsigned char protocol, pec, temp;
	unsigned char len = 0; /* to keep the compiler quiet */
	int i;

	protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
		NVIDIA_SMB_PRTCL_WRITE;
	pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;

	switch (size) {

		case I2C_SMBUS_QUICK:
			protocol |= NVIDIA_SMB_PRTCL_QUICK;
			read_write = I2C_SMBUS_WRITE;
			break;

		case I2C_SMBUS_BYTE:
			if (read_write == I2C_SMBUS_WRITE)
				outb_p(command, NVIDIA_SMB_CMD);
			protocol |= NVIDIA_SMB_PRTCL_BYTE;
			break;

		case I2C_SMBUS_BYTE_DATA:
			outb_p(command, NVIDIA_SMB_CMD);
			if (read_write == I2C_SMBUS_WRITE)
				outb_p(data->byte, NVIDIA_SMB_DATA);
			protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
			break;

		case I2C_SMBUS_WORD_DATA:
			outb_p(command, NVIDIA_SMB_CMD);
			if (read_write == I2C_SMBUS_WRITE) {
				 outb_p(data->word, NVIDIA_SMB_DATA);
				 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
			}
			protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
			break;

		case I2C_SMBUS_BLOCK_DATA:
			outb_p(command, NVIDIA_SMB_CMD);
			if (read_write == I2C_SMBUS_WRITE) {
				len = min_t(u8, data->block[0], 32);
				outb_p(len, NVIDIA_SMB_BCNT);
				for (i = 0; i < len; i++)
					outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
			}
			protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
			break;

		case I2C_SMBUS_I2C_BLOCK_DATA:
			len = min_t(u8, data->block[0], 32);
			outb_p(command, NVIDIA_SMB_CMD);
			outb_p(len, NVIDIA_SMB_BCNT);
			if (read_write == I2C_SMBUS_WRITE)
				for (i = 0; i < len; i++)
					outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
			protocol |= NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA;
			break;

		case I2C_SMBUS_PROC_CALL:
			dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
			return -1;

		case I2C_SMBUS_BLOCK_PROC_CALL:
			dev_err(&adap->dev, "I2C_SMBUS_BLOCK_PROC_CALL not supported!\n");
			return -1;

		default:
			dev_err(&adap->dev, "Unsupported transaction %d\n", size);
			return -1;
	}

	outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
	outb_p(protocol, NVIDIA_SMB_PRTCL);

	temp = inb_p(NVIDIA_SMB_STS);

	if (~temp & NVIDIA_SMB_STS_DONE) {
		udelay(500);
		temp = inb_p(NVIDIA_SMB_STS);
	}
	if (~temp & NVIDIA_SMB_STS_DONE) {
		msleep(10);
		temp = inb_p(NVIDIA_SMB_STS);
	}

	if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
		dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp);
		return -1;
	}

	if (read_write == I2C_SMBUS_WRITE)
		return 0;

	switch (size) {

		case I2C_SMBUS_BYTE:
		case I2C_SMBUS_BYTE_DATA:
			data->byte = inb_p(NVIDIA_SMB_DATA);
			break;

		case I2C_SMBUS_WORD_DATA:
		/* case I2C_SMBUS_PROC_CALL: not supported */
			data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
			break;

		case I2C_SMBUS_BLOCK_DATA:
		/* case I2C_SMBUS_BLOCK_PROC_CALL: not supported */
			len = inb_p(NVIDIA_SMB_BCNT);
			len = min_t(u8, len, 32);
		case I2C_SMBUS_I2C_BLOCK_DATA:
			for (i = 0; i < len; i++)
				data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
			data->block[0] = len;
			break;
	}

	return 0;
}


static u32 nforce2_func(struct i2c_adapter *adapter)
{
	/* other functionality might be possible, but is not tested */
	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 struct pci_device_id nforce2_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
	{ 0 }
};


MODULE_DEVICE_TABLE (pci, nforce2_ids);


static int __devinit nforce2_probe_smb (struct pci_dev *dev, int reg,
	struct nforce2_smbus *smbus, char *name)
{
	u16 iobase;
	int error;

	if (pci_read_config_word(dev, reg, &iobase) != PCIBIOS_SUCCESSFUL) {
		dev_err(&smbus->adapter.dev, "Error reading PCI config for %s\n", name);
		return -1;
	}
	smbus->dev  = dev;
	smbus->base = iobase & 0xfffc;
	smbus->size = 8;

	if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
		dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
			smbus->base, smbus->base+smbus->size-1, name);
		return -1;
	}
	smbus->adapter = nforce2_adapter;
	smbus->adapter.algo_data = smbus;
	smbus->adapter.dev.parent = &dev->dev;
	snprintf(smbus->adapter.name, I2C_NAME_SIZE,
		"SMBus nForce2 adapter at %04x", smbus->base);

	error = i2c_add_adapter(&smbus->adapter);
	if (error) {
		dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
		release_region(smbus->base, smbus->size);
		return -1;
	}
	dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
	return 0;
}


static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	struct nforce2_smbus *smbuses;
	int res1, res2;

	/* we support 2 SMBus adapters */
	if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
		return -ENOMEM;
	pci_set_drvdata(dev, smbuses);

	/* SMBus adapter 1 */
	res1 = nforce2_probe_smb (dev, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
	if (res1 < 0) {
		dev_err(&dev->dev, "Error probing SMB1.\n");
		smbuses[0].base = 0;	/* to have a check value */
	}
	res2 = nforce2_probe_smb (dev, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
	if (res2 < 0) {
		dev_err(&dev->dev, "Error probing SMB2.\n");
		smbuses[1].base = 0;	/* to have a check value */
	}
	if ((res1 < 0) && (res2 < 0)) {
		/* we did not find even one of the SMBuses, so we give up */
		kfree(smbuses);
		return -ENODEV;
	}

	return 0;
}


static void __devexit nforce2_remove(struct pci_dev *dev)
{
	struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);

	if (smbuses[0].base) {
		i2c_del_adapter(&smbuses[0].adapter);
		release_region(smbuses[0].base, smbuses[0].size);
	}
	if (smbuses[1].base) {
		i2c_del_adapter(&smbuses[1].adapter);
		release_region(smbuses[1].base, smbuses[1].size);
	}
	kfree(smbuses);
}

static struct pci_driver nforce2_driver = {
	.name		= "nForce2_smbus",
	.id_table	= nforce2_ids,
	.probe		= nforce2_probe,
	.remove		= __devexit_p(nforce2_remove),
};

static int __init nforce2_init(void)
{
	return pci_register_driver(&nforce2_driver);
}

static void __exit nforce2_exit(void)
{
	pci_unregister_driver(&nforce2_driver);
}

module_init(nforce2_init);
module_exit(nforce2_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	SMBus driver for nVidia nForce2 MCP
	3
	4	Added nForce3 Pro 150 Thomas Leibold <thomas@plx.com>,
	5	Ported to 2.5 Patrick Dreker <patrick@dreker.de>,
	6	Copyright (c) 2003 Hans-Frieder Vogt <hfvogt@arcor.de>,
	7	Based on
	8	SMBus 2.0 driver for AMD-8111 IO-Hub
	9	Copyright (c) 2002 Vojtech Pavlik
	10
	11	This program is free software; you can redistribute it and/or modify
	12	it under the terms of the GNU General Public License as published by
	13	the Free Software Foundation; either version 2 of the License, or
	14	(at your option) any later version.
	15
	16	This program is distributed in the hope that it will be useful,
	17	but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	GNU General Public License for more details.
	20
	21	You should have received a copy of the GNU General Public License
	22	along with this program; if not, write to the Free Software
	23	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25
	26	/*
	27	SUPPORTED DEVICES PCI ID
	28	nForce2 MCP 0064
	29	nForce2 Ultra 400 MCP 0084
	30	nForce3 Pro150 MCP 00D4
	31	nForce3 250Gb MCP 00E4
	32	nForce4 MCP 0052
	33
	34	This driver supports the 2 SMBuses that are included in the MCP of the
	35	nForce2/3/4 chipsets.
	36	*/
	37
	38	/* Note: we assume there can only be one nForce2, with two SMBus interfaces */
	39
1da177e4 LT	40	#include <linux/module.h>
	41	#include <linux/pci.h>
	42	#include <linux/kernel.h>
	43	#include <linux/stddef.h>
	44	#include <linux/sched.h>
	45	#include <linux/ioport.h>
	46	#include <linux/init.h>
	47	#include <linux/i2c.h>
	48	#include <linux/delay.h>
	49	#include <asm/io.h>
	50
	51	MODULE_LICENSE("GPL");
	52	MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@arcor.de>");
	53	MODULE_DESCRIPTION("nForce2 SMBus driver");
	54
	55
	56	struct nforce2_smbus {
	57	struct pci_dev *dev;
	58	struct i2c_adapter adapter;
	59	int base;
	60	int size;
	61	};
	62
	63
	64	/*
	65	* nVidia nForce2 SMBus control register definitions
	66	*/
	67	#define NFORCE_PCI_SMB1 0x50
	68	#define NFORCE_PCI_SMB2 0x54
	69
	70
	71	/*
	72	* ACPI 2.0 chapter 13 SMBus 2.0 EC register model
	73	*/
	74	#define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */
	75	#define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */
	76	#define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */
	77	#define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */
	78	#define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */
	79	#define NVIDIA_SMB_BCNT (smbus->base + 0x24) /* number of data bytes */
	80	#define NVIDIA_SMB_ALRM_A (smbus->base + 0x25) /* alarm address */
	81	#define NVIDIA_SMB_ALRM_D (smbus->base + 0x26) /* 2 bytes alarm data */
	82
	83	#define NVIDIA_SMB_STS_DONE 0x80
	84	#define NVIDIA_SMB_STS_ALRM 0x40
	85	#define NVIDIA_SMB_STS_RES 0x20
	86	#define NVIDIA_SMB_STS_STATUS 0x1f
	87
	88	#define NVIDIA_SMB_PRTCL_WRITE 0x00
	89	#define NVIDIA_SMB_PRTCL_READ 0x01
	90	#define NVIDIA_SMB_PRTCL_QUICK 0x02
	91	#define NVIDIA_SMB_PRTCL_BYTE 0x04
	92	#define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06
	93	#define NVIDIA_SMB_PRTCL_WORD_DATA 0x08
	94	#define NVIDIA_SMB_PRTCL_BLOCK_DATA 0x0a
	95	#define NVIDIA_SMB_PRTCL_PROC_CALL 0x0c
	96	#define NVIDIA_SMB_PRTCL_BLOCK_PROC_CALL 0x0d
	97	#define NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA 0x4a
	98	#define NVIDIA_SMB_PRTCL_PEC 0x80
	99
d6072f84	100	static struct pci_driver nforce2_driver;
1da177e4	101
1da177e4 LT	102	static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,
	103	unsigned short flags, char read_write,
	104	u8 command, int size, union i2c_smbus_data *data);
	105	static u32 nforce2_func(struct i2c_adapter *adapter);
	106
	107
	108	static struct i2c_algorithm smbus_algorithm = {
1da177e4 LT	109	.smbus_xfer = nforce2_access,
	110	.functionality = nforce2_func,
	111	};
	112
	113	static struct i2c_adapter nforce2_adapter = {
	114	.owner = THIS_MODULE,
	115	.class = I2C_CLASS_HWMON,
	116	.algo = &smbus_algorithm,
1da177e4 LT	117	};
	118
	119	/* Return -1 on error. See smbus.h for more information */
	120	static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
	121	unsigned short flags, char read_write,
	122	u8 command, int size, union i2c_smbus_data * data)
	123	{
	124	struct nforce2_smbus *smbus = adap->algo_data;
	125	unsigned char protocol, pec, temp;
	126	unsigned char len = 0; /* to keep the compiler quiet */
1da177e4 LT	127	int i;
	128
	129	protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
	130	NVIDIA_SMB_PRTCL_WRITE;
	131	pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
	132
	133	switch (size) {
	134
	135	case I2C_SMBUS_QUICK:
	136	protocol \|= NVIDIA_SMB_PRTCL_QUICK;
	137	read_write = I2C_SMBUS_WRITE;
	138	break;
	139
	140	case I2C_SMBUS_BYTE:
	141	if (read_write == I2C_SMBUS_WRITE)
	142	outb_p(command, NVIDIA_SMB_CMD);
	143	protocol \|= NVIDIA_SMB_PRTCL_BYTE;
	144	break;
	145
	146	case I2C_SMBUS_BYTE_DATA:
	147	outb_p(command, NVIDIA_SMB_CMD);
	148	if (read_write == I2C_SMBUS_WRITE)
	149	outb_p(data->byte, NVIDIA_SMB_DATA);
	150	protocol \|= NVIDIA_SMB_PRTCL_BYTE_DATA;
	151	break;
	152
	153	case I2C_SMBUS_WORD_DATA:
	154	outb_p(command, NVIDIA_SMB_CMD);
	155	if (read_write == I2C_SMBUS_WRITE) {
	156	outb_p(data->word, NVIDIA_SMB_DATA);
	157	outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
	158	}
	159	protocol \|= NVIDIA_SMB_PRTCL_WORD_DATA \| pec;
	160	break;
	161
	162	case I2C_SMBUS_BLOCK_DATA:
	163	outb_p(command, NVIDIA_SMB_CMD);
	164	if (read_write == I2C_SMBUS_WRITE) {
	165	len = min_t(u8, data->block[0], 32);
	166	outb_p(len, NVIDIA_SMB_BCNT);
	167	for (i = 0; i < len; i++)
	168	outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
	169	}
	170	protocol \|= NVIDIA_SMB_PRTCL_BLOCK_DATA \| pec;
	171	break;
	172
	173	case I2C_SMBUS_I2C_BLOCK_DATA:
	174	len = min_t(u8, data->block[0], 32);
	175	outb_p(command, NVIDIA_SMB_CMD);
	176	outb_p(len, NVIDIA_SMB_BCNT);
	177	if (read_write == I2C_SMBUS_WRITE)
	178	for (i = 0; i < len; i++)
	179	outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
	180	protocol \|= NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA;
	181	break;
	182
	183	case I2C_SMBUS_PROC_CALL:
	184	dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
	185	return -1;
1da177e4 LT	186
	187	case I2C_SMBUS_BLOCK_PROC_CALL:
	188	dev_err(&adap->dev, "I2C_SMBUS_BLOCK_PROC_CALL not supported!\n");
	189	return -1;
1da177e4	190
1da177e4 LT	191	default:
	192	dev_err(&adap->dev, "Unsupported transaction %d\n", size);
	193	return -1;
	194	}
	195
	196	outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
	197	outb_p(protocol, NVIDIA_SMB_PRTCL);
	198
	199	temp = inb_p(NVIDIA_SMB_STS);
	200
1da177e4 LT	201	if (~temp & NVIDIA_SMB_STS_DONE) {
	202	udelay(500);
	203	temp = inb_p(NVIDIA_SMB_STS);
	204	}
	205	if (~temp & NVIDIA_SMB_STS_DONE) {
	206	msleep(10);
	207	temp = inb_p(NVIDIA_SMB_STS);
	208	}
	209
5033017c HFV	210	if ((~temp & NVIDIA_SMB_STS_DONE) \|\| (temp & NVIDIA_SMB_STS_STATUS)) {
5033017c HFV	211	dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp);
1da177e4	212	return -1;
5033017c	213	}
1da177e4 LT	214
	215	if (read_write == I2C_SMBUS_WRITE)
	216	return 0;
	217
	218	switch (size) {
	219
	220	case I2C_SMBUS_BYTE:
	221	case I2C_SMBUS_BYTE_DATA:
	222	data->byte = inb_p(NVIDIA_SMB_DATA);
	223	break;
	224
	225	case I2C_SMBUS_WORD_DATA:
	226	/* case I2C_SMBUS_PROC_CALL: not supported */
	227	data->word = inb_p(NVIDIA_SMB_DATA) \| (inb_p(NVIDIA_SMB_DATA+1) << 8);
	228	break;
	229
	230	case I2C_SMBUS_BLOCK_DATA:
	231	/* case I2C_SMBUS_BLOCK_PROC_CALL: not supported */
	232	len = inb_p(NVIDIA_SMB_BCNT);
	233	len = min_t(u8, len, 32);
	234	case I2C_SMBUS_I2C_BLOCK_DATA:
	235	for (i = 0; i < len; i++)
	236	data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
	237	data->block[0] = len;
	238	break;
	239	}
	240
	241	return 0;
	242	}
	243
	244
	245	static u32 nforce2_func(struct i2c_adapter *adapter)
	246	{
	247	/* other functionality might be possible, but is not tested */
	248	return I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
	249	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA /* \|
	250	I2C_FUNC_SMBUS_BLOCK_DATA */;
	251	}
	252
	253
	254	static struct pci_device_id nforce2_ids[] = {
	255	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
	256	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
	257	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
	258	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
	259	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
	260	{ 0 }
	261	};
	262
	263
	264	MODULE_DEVICE_TABLE (pci, nforce2_ids);
	265
	266
	267	static int __devinit nforce2_probe_smb (struct pci_dev *dev, int reg,
	268	struct nforce2_smbus smbus, char name)
	269	{
	270	u16 iobase;
	271	int error;
	272
	273	if (pci_read_config_word(dev, reg, &iobase) != PCIBIOS_SUCCESSFUL) {
	274	dev_err(&smbus->adapter.dev, "Error reading PCI config for %s\n", name);
	275	return -1;
	276	}
	277	smbus->dev = dev;
278	smbus->base = iobase & 0xfffc;
279	smbus->size = 8;
280
d6072f84	281	if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
1da177e4 LT	282	dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
	283	smbus->base, smbus->base+smbus->size-1, name);
	284	return -1;
	285	}
	286	smbus->adapter = nforce2_adapter;
	287	smbus->adapter.algo_data = smbus;
	288	smbus->adapter.dev.parent = &dev->dev;
	289	snprintf(smbus->adapter.name, I2C_NAME_SIZE,
	290	"SMBus nForce2 adapter at %04x", smbus->base);
	291
	292	error = i2c_add_adapter(&smbus->adapter);
	293	if (error) {
	294	dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
	295	release_region(smbus->base, smbus->size);
	296	return -1;
	297	}
	298	dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
	299	return 0;
	300	}
	301
	302
	303	static int __devinit nforce2_probe(struct pci_dev dev, const struct pci_device_id id)
	304	{
	305	struct nforce2_smbus *smbuses;
	306	int res1, res2;
	307
	308	/* we support 2 SMBus adapters */
078d9fe4	309	if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
1da177e4	310	return -ENOMEM;
1da177e4 LT	311	pci_set_drvdata(dev, smbuses);
	312
	313	/* SMBus adapter 1 */
	314	res1 = nforce2_probe_smb (dev, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
	315	if (res1 < 0) {
	316	dev_err(&dev->dev, "Error probing SMB1.\n");
	317	smbuses[0].base = 0; /* to have a check value */
	318	}
	319	res2 = nforce2_probe_smb (dev, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
	320	if (res2 < 0) {
	321	dev_err(&dev->dev, "Error probing SMB2.\n");
	322	smbuses[1].base = 0; /* to have a check value */
	323	}
	324	if ((res1 < 0) && (res2 < 0)) {
	325	/* we did not find even one of the SMBuses, so we give up */
	326	kfree(smbuses);
	327	return -ENODEV;
	328	}
	329
	330	return 0;
	331	}
	332
	333
	334	static void __devexit nforce2_remove(struct pci_dev *dev)
	335	{
	336	struct nforce2_smbus smbuses = (void) pci_get_drvdata(dev);
	337
	338	if (smbuses[0].base) {
	339	i2c_del_adapter(&smbuses[0].adapter);
	340	release_region(smbuses[0].base, smbuses[0].size);
	341	}
	342	if (smbuses[1].base) {
	343	i2c_del_adapter(&smbuses[1].adapter);
	344	release_region(smbuses[1].base, smbuses[1].size);
	345	}
	346	kfree(smbuses);
	347	}
	348
	349	static struct pci_driver nforce2_driver = {
	350	.name = "nForce2_smbus",
	351	.id_table = nforce2_ids,
	352	.probe = nforce2_probe,
	353	.remove = __devexit_p(nforce2_remove),
	354	};
	355
	356	static int __init nforce2_init(void)
	357	{
	358	return pci_register_driver(&nforce2_driver);
	359	}
	360
	361	static void __exit nforce2_exit(void)
	362	{
	363	pci_unregister_driver(&nforce2_driver);
	364	}
	365
	366	module_init(nforce2_init);
	367	module_exit(nforce2_exit);
	368