[mirror_ubuntu-zesty-kernel.git] / drivers / i2c / busses / i2c-amd8111.c

/*
 * 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 version 2.
 */

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

MODULE_LICENSE("GPL");
MODULE_AUTHOR ("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("AMD8111 SMBus 2.0 driver");

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

static struct pci_driver amd8111_driver;

/*
 * AMD PCI control registers definitions.
 */

#define AMD_PCI_MISC	0x48

#define AMD_PCI_MISC_SCI	0x04	/* deliver SCI */
#define AMD_PCI_MISC_INT	0x02	/* deliver PCI IRQ */
#define AMD_PCI_MISC_SPEEDUP	0x01	/* 16x clock speedup */

/*
 * ACPI 2.0 chapter 13 PCI interface definitions.
 */

#define AMD_EC_DATA	0x00	/* data register */
#define AMD_EC_SC	0x04	/* status of controller */
#define AMD_EC_CMD	0x04	/* command register */
#define AMD_EC_ICR	0x08	/* interrupt control register */

#define AMD_EC_SC_SMI	0x04	/* smi event pending */
#define AMD_EC_SC_SCI	0x02	/* sci event pending */
#define AMD_EC_SC_BURST	0x01	/* burst mode enabled */
#define AMD_EC_SC_CMD	0x08	/* byte in data reg is command */
#define AMD_EC_SC_IBF	0x02	/* data ready for embedded controller */
#define AMD_EC_SC_OBF	0x01	/* data ready for host */

#define AMD_EC_CMD_RD	0x80	/* read EC */
#define AMD_EC_CMD_WR	0x81	/* write EC */
#define AMD_EC_CMD_BE	0x82	/* enable burst mode */
#define AMD_EC_CMD_BD	0x83	/* disable burst mode */
#define AMD_EC_CMD_QR	0x84	/* query EC */

/*
 * ACPI 2.0 chapter 13 access of registers of the EC
 */

static unsigned int amd_ec_wait_write(struct amd_smbus *smbus)
{
	int timeout = 500;

	while ((inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_IBF) && --timeout)
		udelay(1);

	if (!timeout) {
		dev_warn(&smbus->dev->dev,
			 "Timeout while waiting for IBF to clear\n");
		return -ETIMEDOUT;
	}

	return 0;
}

static unsigned int amd_ec_wait_read(struct amd_smbus *smbus)
{
	int timeout = 500;

	while ((~inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_OBF) && --timeout)
		udelay(1);

	if (!timeout) {
		dev_warn(&smbus->dev->dev,
			 "Timeout while waiting for OBF to set\n");
		return -ETIMEDOUT;
	}

	return 0;
}

static unsigned int amd_ec_read(struct amd_smbus *smbus, unsigned char address,
		unsigned char *data)
{
	int status;

	status = amd_ec_wait_write(smbus);
	if (status)
		return status;
	outb(AMD_EC_CMD_RD, smbus->base + AMD_EC_CMD);

	status = amd_ec_wait_write(smbus);
	if (status)
		return status;
	outb(address, smbus->base + AMD_EC_DATA);

	status = amd_ec_wait_read(smbus);
	if (status)
		return status;
	*data = inb(smbus->base + AMD_EC_DATA);

	return 0;
}

static unsigned int amd_ec_write(struct amd_smbus *smbus, unsigned char address,
		unsigned char data)
{
	int status;

	status = amd_ec_wait_write(smbus);
	if (status)
		return status;
	outb(AMD_EC_CMD_WR, smbus->base + AMD_EC_CMD);

	status = amd_ec_wait_write(smbus);
	if (status)
		return status;
	outb(address, smbus->base + AMD_EC_DATA);

	status = amd_ec_wait_write(smbus);
	if (status)
		return status;
	outb(data, smbus->base + AMD_EC_DATA);

	return 0;
}

/*
 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
 */

#define AMD_SMB_PRTCL	0x00	/* protocol, PEC */
#define AMD_SMB_STS	0x01	/* status */
#define AMD_SMB_ADDR	0x02	/* address */
#define AMD_SMB_CMD	0x03	/* command */
#define AMD_SMB_DATA	0x04	/* 32 data registers */
#define AMD_SMB_BCNT	0x24	/* number of data bytes */
#define AMD_SMB_ALRM_A	0x25	/* alarm address */
#define AMD_SMB_ALRM_D	0x26	/* 2 bytes alarm data */

#define AMD_SMB_STS_DONE	0x80
#define AMD_SMB_STS_ALRM	0x40
#define AMD_SMB_STS_RES		0x20
#define AMD_SMB_STS_STATUS	0x1f

#define AMD_SMB_STATUS_OK	0x00
#define AMD_SMB_STATUS_FAIL	0x07
#define AMD_SMB_STATUS_DNAK	0x10
#define AMD_SMB_STATUS_DERR	0x11
#define AMD_SMB_STATUS_CMD_DENY	0x12
#define AMD_SMB_STATUS_UNKNOWN	0x13
#define AMD_SMB_STATUS_ACC_DENY	0x17
#define AMD_SMB_STATUS_TIMEOUT	0x18
#define AMD_SMB_STATUS_NOTSUP	0x19
#define AMD_SMB_STATUS_BUSY	0x1A
#define AMD_SMB_STATUS_PEC	0x1F

#define AMD_SMB_PRTCL_WRITE		0x00
#define AMD_SMB_PRTCL_READ		0x01
#define AMD_SMB_PRTCL_QUICK		0x02
#define AMD_SMB_PRTCL_BYTE		0x04
#define AMD_SMB_PRTCL_BYTE_DATA		0x06
#define AMD_SMB_PRTCL_WORD_DATA		0x08
#define AMD_SMB_PRTCL_BLOCK_DATA	0x0a
#define AMD_SMB_PRTCL_PROC_CALL		0x0c
#define AMD_SMB_PRTCL_BLOCK_PROC_CALL	0x0d
#define AMD_SMB_PRTCL_I2C_BLOCK_DATA	0x4a
#define AMD_SMB_PRTCL_PEC		0x80


static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
		unsigned short flags, char read_write, u8 command, int size,
		union i2c_smbus_data * data)
{
	struct amd_smbus *smbus = adap->algo_data;
	unsigned char protocol, len, pec, temp[2];
	int i;

	protocol = (read_write == I2C_SMBUS_READ) ? AMD_SMB_PRTCL_READ
						  : AMD_SMB_PRTCL_WRITE;
	pec = (flags & I2C_CLIENT_PEC) ? AMD_SMB_PRTCL_PEC : 0;

	switch (size) {
		case I2C_SMBUS_QUICK:
			protocol |= AMD_SMB_PRTCL_QUICK;
			read_write = I2C_SMBUS_WRITE;
			break;

		case I2C_SMBUS_BYTE:
			if (read_write == I2C_SMBUS_WRITE)
				amd_ec_write(smbus, AMD_SMB_CMD, command);
			protocol |= AMD_SMB_PRTCL_BYTE;
			break;

		case I2C_SMBUS_BYTE_DATA:
			amd_ec_write(smbus, AMD_SMB_CMD, command);
			if (read_write == I2C_SMBUS_WRITE)
				amd_ec_write(smbus, AMD_SMB_DATA, data->byte);
			protocol |= AMD_SMB_PRTCL_BYTE_DATA;
			break;

		case I2C_SMBUS_WORD_DATA:
			amd_ec_write(smbus, AMD_SMB_CMD, command);
			if (read_write == I2C_SMBUS_WRITE) {
				amd_ec_write(smbus, AMD_SMB_DATA,
					     data->word & 0xff);
				amd_ec_write(smbus, AMD_SMB_DATA + 1,
					     data->word >> 8);
			}
			protocol |= AMD_SMB_PRTCL_WORD_DATA | pec;
			break;

		case I2C_SMBUS_BLOCK_DATA:
			amd_ec_write(smbus, AMD_SMB_CMD, command);
			if (read_write == I2C_SMBUS_WRITE) {
				len = min_t(u8, data->block[0],
					    I2C_SMBUS_BLOCK_MAX);
				amd_ec_write(smbus, AMD_SMB_BCNT, len);
				for (i = 0; i < len; i++)
					amd_ec_write(smbus, AMD_SMB_DATA + i,
						     data->block[i + 1]);
			}
			protocol |= AMD_SMB_PRTCL_BLOCK_DATA | pec;
			break;

		case I2C_SMBUS_I2C_BLOCK_DATA:
			len = min_t(u8, data->block[0],
				    I2C_SMBUS_BLOCK_MAX);
			amd_ec_write(smbus, AMD_SMB_CMD, command);
			amd_ec_write(smbus, AMD_SMB_BCNT, len);
			if (read_write == I2C_SMBUS_WRITE)
				for (i = 0; i < len; i++)
					amd_ec_write(smbus, AMD_SMB_DATA + i,
						     data->block[i + 1]);
			protocol |= AMD_SMB_PRTCL_I2C_BLOCK_DATA;
			break;

		case I2C_SMBUS_PROC_CALL:
			amd_ec_write(smbus, AMD_SMB_CMD, command);
			amd_ec_write(smbus, AMD_SMB_DATA, data->word & 0xff);
			amd_ec_write(smbus, AMD_SMB_DATA + 1, data->word >> 8);
			protocol = AMD_SMB_PRTCL_PROC_CALL | pec;
			read_write = I2C_SMBUS_READ;
			break;

		case I2C_SMBUS_BLOCK_PROC_CALL:
			len = min_t(u8, data->block[0],
				    I2C_SMBUS_BLOCK_MAX - 1);
			amd_ec_write(smbus, AMD_SMB_CMD, command);
			amd_ec_write(smbus, AMD_SMB_BCNT, len);
			for (i = 0; i < len; i++)
				amd_ec_write(smbus, AMD_SMB_DATA + i,
					     data->block[i + 1]);
			protocol = AMD_SMB_PRTCL_BLOCK_PROC_CALL | pec;
			read_write = I2C_SMBUS_READ;
			break;

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

	amd_ec_write(smbus, AMD_SMB_ADDR, addr << 1);
	amd_ec_write(smbus, AMD_SMB_PRTCL, protocol);

	/* FIXME this discards status from ec_read(); so temp[0] will
	 * hold stack garbage ... the rest of this routine will act
	 * nonsensically.  Ignored ec_write() status might explain
	 * some such failures...
	 */
	amd_ec_read(smbus, AMD_SMB_STS, temp + 0);

	if (~temp[0] & AMD_SMB_STS_DONE) {
		udelay(500);
		amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
	}

	if (~temp[0] & AMD_SMB_STS_DONE) {
		msleep(1);
		amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
	}

	if ((~temp[0] & AMD_SMB_STS_DONE) || (temp[0] & AMD_SMB_STS_STATUS))
		return -EIO;

	if (read_write == I2C_SMBUS_WRITE)
		return 0;

	switch (size) {
		case I2C_SMBUS_BYTE:
		case I2C_SMBUS_BYTE_DATA:
			amd_ec_read(smbus, AMD_SMB_DATA, &data->byte);
			break;

		case I2C_SMBUS_WORD_DATA:
		case I2C_SMBUS_PROC_CALL:
			amd_ec_read(smbus, AMD_SMB_DATA, temp + 0);
			amd_ec_read(smbus, AMD_SMB_DATA + 1, temp + 1);
			data->word = (temp[1] << 8) | temp[0];
			break;

		case I2C_SMBUS_BLOCK_DATA:
		case I2C_SMBUS_BLOCK_PROC_CALL:
			amd_ec_read(smbus, AMD_SMB_BCNT, &len);
			len = min_t(u8, len, I2C_SMBUS_BLOCK_MAX);
		case I2C_SMBUS_I2C_BLOCK_DATA:
			for (i = 0; i < len; i++)
				amd_ec_read(smbus, AMD_SMB_DATA + i,
					    data->block + i + 1);
			data->block[0] = len;
			break;
	}

	return 0;
}


static u32 amd8111_func(struct i2c_adapter *adapter)
{
	return	I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
		I2C_FUNC_SMBUS_BYTE_DATA |
		I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BLOCK_DATA |
		I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
		I2C_FUNC_SMBUS_I2C_BLOCK | I2C_FUNC_SMBUS_PEC;
}

static const struct i2c_algorithm smbus_algorithm = {
	.smbus_xfer = amd8111_access,
	.functionality = amd8111_func,
};


static const struct pci_device_id amd8111_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS2) },
	{ 0, }
};

MODULE_DEVICE_TABLE (pci, amd8111_ids);

static int __devinit amd8111_probe(struct pci_dev *dev,
		const struct pci_device_id *id)
{
	struct amd_smbus *smbus;
	int error;

	if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
		return -ENODEV;

	smbus = kzalloc(sizeof(struct amd_smbus), GFP_KERNEL);
	if (!smbus)
		return -ENOMEM;

	smbus->dev = dev;
	smbus->base = pci_resource_start(dev, 0);
	smbus->size = pci_resource_len(dev, 0);

	error = acpi_check_resource_conflict(&dev->resource[0]);
	if (error) {
		error = -ENODEV;
		goto out_kfree;
	}

	if (!request_region(smbus->base, smbus->size, amd8111_driver.name)) {
		error = -EBUSY;
		goto out_kfree;
	}

	smbus->adapter.owner = THIS_MODULE;
	snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
		"SMBus2 AMD8111 adapter at %04x", smbus->base);
	smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
	smbus->adapter.algo = &smbus_algorithm;
	smbus->adapter.algo_data = smbus;

	/* set up the sysfs linkage to our parent device */
	smbus->adapter.dev.parent = &dev->dev;

	pci_write_config_dword(smbus->dev, AMD_PCI_MISC, 0);
	error = i2c_add_adapter(&smbus->adapter);
	if (error)
		goto out_release_region;

	pci_set_drvdata(dev, smbus);
	return 0;

 out_release_region:
	release_region(smbus->base, smbus->size);
 out_kfree:
	kfree(smbus);
	return error;
}

static void __devexit amd8111_remove(struct pci_dev *dev)
{
	struct amd_smbus *smbus = pci_get_drvdata(dev);

	i2c_del_adapter(&smbus->adapter);
	release_region(smbus->base, smbus->size);
	kfree(smbus);
}

static struct pci_driver amd8111_driver = {
	.name		= "amd8111_smbus2",
	.id_table	= amd8111_ids,
	.probe		= amd8111_probe,
	.remove		= __devexit_p(amd8111_remove),
};

static int __init i2c_amd8111_init(void)
{
	return pci_register_driver(&amd8111_driver);
}

static void __exit i2c_amd8111_exit(void)
{
	pci_unregister_driver(&amd8111_driver);
}

module_init(i2c_amd8111_init);
module_exit(i2c_amd8111_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* SMBus 2.0 driver for AMD-8111 IO-Hub.
	3	*
	4	* Copyright (c) 2002 Vojtech Pavlik
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation version 2.
	9	*/
	10
1da177e4 LT	11	#include <linux/module.h>
	12	#include <linux/pci.h>
	13	#include <linux/kernel.h>
	14	#include <linux/stddef.h>
1da177e4 LT	15	#include <linux/ioport.h>
	16	#include <linux/init.h>
	17	#include <linux/i2c.h>
	18	#include <linux/delay.h>
54fb4a05	19	#include <linux/acpi.h>
5a0e3ad6	20	#include <linux/slab.h>
21782180	21	#include <linux/io.h>
1da177e4 LT	22
	23	MODULE_LICENSE("GPL");
	24	MODULE_AUTHOR ("Vojtech Pavlik <vojtech@suse.cz>");
	25	MODULE_DESCRIPTION("AMD8111 SMBus 2.0 driver");
	26
	27	struct amd_smbus {
	28	struct pci_dev *dev;
	29	struct i2c_adapter adapter;
	30	int base;
	31	int size;
	32	};
	33
d6072f84 JD	34	static struct pci_driver amd8111_driver;
d6072f84 JD	35
1da177e4 LT	36	/*
	37	* AMD PCI control registers definitions.
	38	*/
	39
	40	#define AMD_PCI_MISC 0x48
	41
	42	#define AMD_PCI_MISC_SCI 0x04 /* deliver SCI */
	43	#define AMD_PCI_MISC_INT 0x02 /* deliver PCI IRQ */
	44	#define AMD_PCI_MISC_SPEEDUP 0x01 /* 16x clock speedup */
	45
	46	/*
	47	* ACPI 2.0 chapter 13 PCI interface definitions.
	48	*/
	49
	50	#define AMD_EC_DATA 0x00 /* data register */
	51	#define AMD_EC_SC 0x04 /* status of controller */
	52	#define AMD_EC_CMD 0x04 /* command register */
	53	#define AMD_EC_ICR 0x08 /* interrupt control register */
	54
	55	#define AMD_EC_SC_SMI 0x04 /* smi event pending */
	56	#define AMD_EC_SC_SCI 0x02 /* sci event pending */
	57	#define AMD_EC_SC_BURST 0x01 /* burst mode enabled */
	58	#define AMD_EC_SC_CMD 0x08 /* byte in data reg is command */
	59	#define AMD_EC_SC_IBF 0x02 /* data ready for embedded controller */
	60	#define AMD_EC_SC_OBF 0x01 /* data ready for host */
	61
	62	#define AMD_EC_CMD_RD 0x80 /* read EC */
	63	#define AMD_EC_CMD_WR 0x81 /* write EC */
	64	#define AMD_EC_CMD_BE 0x82 /* enable burst mode */
	65	#define AMD_EC_CMD_BD 0x83 /* disable burst mode */
	66	#define AMD_EC_CMD_QR 0x84 /* query EC */
	67
	68	/*
	69	* ACPI 2.0 chapter 13 access of registers of the EC
	70	*/
	71
	72	static unsigned int amd_ec_wait_write(struct amd_smbus *smbus)
	73	{
	74	int timeout = 500;
	75
a746b578	76	while ((inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_IBF) && --timeout)
1da177e4 LT	77	udelay(1);
	78
	79	if (!timeout) {
88b9e750 JD	80	dev_warn(&smbus->dev->dev,
88b9e750 JD	81	"Timeout while waiting for IBF to clear\n");
97140342	82	return -ETIMEDOUT;
1da177e4 LT	83	}
	84
	85	return 0;
	86	}
	87
	88	static unsigned int amd_ec_wait_read(struct amd_smbus *smbus)
	89	{
	90	int timeout = 500;
	91
a746b578	92	while ((~inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_OBF) && --timeout)
1da177e4 LT	93	udelay(1);
	94
	95	if (!timeout) {
88b9e750 JD	96	dev_warn(&smbus->dev->dev,
88b9e750 JD	97	"Timeout while waiting for OBF to set\n");
97140342	98	return -ETIMEDOUT;
1da177e4 LT	99	}
	100
	101	return 0;
	102	}
	103
88b9e750 JD	104	static unsigned int amd_ec_read(struct amd_smbus *smbus, unsigned char address,
88b9e750 JD	105	unsigned char *data)
1da177e4	106	{
97140342 DB	107	int status;
	108
	109	status = amd_ec_wait_write(smbus);
	110	if (status)
	111	return status;
1da177e4 LT	112	outb(AMD_EC_CMD_RD, smbus->base + AMD_EC_CMD);
1da177e4 LT	113
97140342 DB	114	status = amd_ec_wait_write(smbus);
	115	if (status)
	116	return status;
1da177e4 LT	117	outb(address, smbus->base + AMD_EC_DATA);
1da177e4 LT	118
97140342 DB	119	status = amd_ec_wait_read(smbus);
	120	if (status)
	121	return status;
1da177e4 LT	122	*data = inb(smbus->base + AMD_EC_DATA);
	123
	124	return 0;
	125	}
	126
88b9e750 JD	127	static unsigned int amd_ec_write(struct amd_smbus *smbus, unsigned char address,
88b9e750 JD	128	unsigned char data)
1da177e4	129	{
97140342 DB	130	int status;
	131
	132	status = amd_ec_wait_write(smbus);
	133	if (status)
	134	return status;
1da177e4 LT	135	outb(AMD_EC_CMD_WR, smbus->base + AMD_EC_CMD);
1da177e4 LT	136
97140342 DB	137	status = amd_ec_wait_write(smbus);
	138	if (status)
	139	return status;
1da177e4 LT	140	outb(address, smbus->base + AMD_EC_DATA);
1da177e4 LT	141
97140342 DB	142	status = amd_ec_wait_write(smbus);
	143	if (status)
	144	return status;
1da177e4 LT	145	outb(data, smbus->base + AMD_EC_DATA);
	146
	147	return 0;
	148	}
	149
	150	/*
	151	* ACPI 2.0 chapter 13 SMBus 2.0 EC register model
	152	*/
	153
	154	#define AMD_SMB_PRTCL 0x00 /* protocol, PEC */
	155	#define AMD_SMB_STS 0x01 /* status */
	156	#define AMD_SMB_ADDR 0x02 /* address */
	157	#define AMD_SMB_CMD 0x03 /* command */
	158	#define AMD_SMB_DATA 0x04 /* 32 data registers */
	159	#define AMD_SMB_BCNT 0x24 /* number of data bytes */
	160	#define AMD_SMB_ALRM_A 0x25 /* alarm address */
	161	#define AMD_SMB_ALRM_D 0x26 /* 2 bytes alarm data */
	162
	163	#define AMD_SMB_STS_DONE 0x80
	164	#define AMD_SMB_STS_ALRM 0x40
	165	#define AMD_SMB_STS_RES 0x20
	166	#define AMD_SMB_STS_STATUS 0x1f
	167
	168	#define AMD_SMB_STATUS_OK 0x00
	169	#define AMD_SMB_STATUS_FAIL 0x07
	170	#define AMD_SMB_STATUS_DNAK 0x10
	171	#define AMD_SMB_STATUS_DERR 0x11
	172	#define AMD_SMB_STATUS_CMD_DENY 0x12
	173	#define AMD_SMB_STATUS_UNKNOWN 0x13
	174	#define AMD_SMB_STATUS_ACC_DENY 0x17
	175	#define AMD_SMB_STATUS_TIMEOUT 0x18
	176	#define AMD_SMB_STATUS_NOTSUP 0x19
	177	#define AMD_SMB_STATUS_BUSY 0x1A
	178	#define AMD_SMB_STATUS_PEC 0x1F
	179
	180	#define AMD_SMB_PRTCL_WRITE 0x00
	181	#define AMD_SMB_PRTCL_READ 0x01
	182	#define AMD_SMB_PRTCL_QUICK 0x02
	183	#define AMD_SMB_PRTCL_BYTE 0x04
	184	#define AMD_SMB_PRTCL_BYTE_DATA 0x06
	185	#define AMD_SMB_PRTCL_WORD_DATA 0x08
	186	#define AMD_SMB_PRTCL_BLOCK_DATA 0x0a
	187	#define AMD_SMB_PRTCL_PROC_CALL 0x0c
	188	#define AMD_SMB_PRTCL_BLOCK_PROC_CALL 0x0d
	189	#define AMD_SMB_PRTCL_I2C_BLOCK_DATA 0x4a
	190	#define AMD_SMB_PRTCL_PEC 0x80
	191
	192
88b9e750 JD	193	static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
	194	unsigned short flags, char read_write, u8 command, int size,
	195	union i2c_smbus_data * data)
1da177e4 LT	196	{
	197	struct amd_smbus *smbus = adap->algo_data;
	198	unsigned char protocol, len, pec, temp[2];
	199	int i;
	200
88b9e750 JD	201	protocol = (read_write == I2C_SMBUS_READ) ? AMD_SMB_PRTCL_READ
88b9e750 JD	202	: AMD_SMB_PRTCL_WRITE;
1da177e4 LT	203	pec = (flags & I2C_CLIENT_PEC) ? AMD_SMB_PRTCL_PEC : 0;
	204
	205	switch (size) {
1da177e4 LT	206	case I2C_SMBUS_QUICK:
	207	protocol \|= AMD_SMB_PRTCL_QUICK;
	208	read_write = I2C_SMBUS_WRITE;
	209	break;
	210
	211	case I2C_SMBUS_BYTE:
	212	if (read_write == I2C_SMBUS_WRITE)
	213	amd_ec_write(smbus, AMD_SMB_CMD, command);
	214	protocol \|= AMD_SMB_PRTCL_BYTE;
	215	break;
	216
	217	case I2C_SMBUS_BYTE_DATA:
	218	amd_ec_write(smbus, AMD_SMB_CMD, command);
	219	if (read_write == I2C_SMBUS_WRITE)
	220	amd_ec_write(smbus, AMD_SMB_DATA, data->byte);
	221	protocol \|= AMD_SMB_PRTCL_BYTE_DATA;
	222	break;
	223
	224	case I2C_SMBUS_WORD_DATA:
	225	amd_ec_write(smbus, AMD_SMB_CMD, command);
	226	if (read_write == I2C_SMBUS_WRITE) {
88b9e750 JD	227	amd_ec_write(smbus, AMD_SMB_DATA,
	228	data->word & 0xff);
	229	amd_ec_write(smbus, AMD_SMB_DATA + 1,
	230	data->word >> 8);
1da177e4 LT	231	}
	232	protocol \|= AMD_SMB_PRTCL_WORD_DATA \| pec;
	233	break;
	234
	235	case I2C_SMBUS_BLOCK_DATA:
	236	amd_ec_write(smbus, AMD_SMB_CMD, command);
	237	if (read_write == I2C_SMBUS_WRITE) {
88b9e750 JD	238	len = min_t(u8, data->block[0],
88b9e750 JD	239	I2C_SMBUS_BLOCK_MAX);
1da177e4 LT	240	amd_ec_write(smbus, AMD_SMB_BCNT, len);
1da177e4 LT	241	for (i = 0; i < len; i++)
88b9e750 JD	242	amd_ec_write(smbus, AMD_SMB_DATA + i,
88b9e750 JD	243	data->block[i + 1]);
1da177e4 LT	244	}
	245	protocol \|= AMD_SMB_PRTCL_BLOCK_DATA \| pec;
	246	break;
	247
	248	case I2C_SMBUS_I2C_BLOCK_DATA:
88b9e750 JD	249	len = min_t(u8, data->block[0],
88b9e750 JD	250	I2C_SMBUS_BLOCK_MAX);
1da177e4 LT	251	amd_ec_write(smbus, AMD_SMB_CMD, command);
	252	amd_ec_write(smbus, AMD_SMB_BCNT, len);
	253	if (read_write == I2C_SMBUS_WRITE)
	254	for (i = 0; i < len; i++)
88b9e750 JD	255	amd_ec_write(smbus, AMD_SMB_DATA + i,
88b9e750 JD	256	data->block[i + 1]);
1da177e4 LT	257	protocol \|= AMD_SMB_PRTCL_I2C_BLOCK_DATA;
	258	break;
	259
	260	case I2C_SMBUS_PROC_CALL:
	261	amd_ec_write(smbus, AMD_SMB_CMD, command);
88b9e750	262	amd_ec_write(smbus, AMD_SMB_DATA, data->word & 0xff);
1da177e4 LT	263	amd_ec_write(smbus, AMD_SMB_DATA + 1, data->word >> 8);
	264	protocol = AMD_SMB_PRTCL_PROC_CALL \| pec;
	265	read_write = I2C_SMBUS_READ;
	266	break;
	267
	268	case I2C_SMBUS_BLOCK_PROC_CALL:
58791fd8 JD	269	len = min_t(u8, data->block[0],
58791fd8 JD	270	I2C_SMBUS_BLOCK_MAX - 1);
1da177e4 LT	271	amd_ec_write(smbus, AMD_SMB_CMD, command);
	272	amd_ec_write(smbus, AMD_SMB_BCNT, len);
	273	for (i = 0; i < len; i++)
88b9e750 JD	274	amd_ec_write(smbus, AMD_SMB_DATA + i,
88b9e750 JD	275	data->block[i + 1]);
1da177e4 LT	276	protocol = AMD_SMB_PRTCL_BLOCK_PROC_CALL \| pec;
	277	read_write = I2C_SMBUS_READ;
	278	break;
	279
1da177e4 LT	280	default:
1da177e4 LT	281	dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
97140342	282	return -EOPNOTSUPP;
1da177e4 LT	283	}
	284
	285	amd_ec_write(smbus, AMD_SMB_ADDR, addr << 1);
	286	amd_ec_write(smbus, AMD_SMB_PRTCL, protocol);
	287
97140342 DB	288	/* FIXME this discards status from ec_read(); so temp[0] will
	289	* hold stack garbage ... the rest of this routine will act
	290	* nonsensically. Ignored ec_write() status might explain
	291	* some such failures...
	292	*/
1da177e4 LT	293	amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
	294
	295	if (~temp[0] & AMD_SMB_STS_DONE) {
	296	udelay(500);
	297	amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
	298	}
	299
	300	if (~temp[0] & AMD_SMB_STS_DONE) {
	301	msleep(1);
	302	amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
	303	}
	304
	305	if ((~temp[0] & AMD_SMB_STS_DONE) \|\| (temp[0] & AMD_SMB_STS_STATUS))
97140342	306	return -EIO;
1da177e4 LT	307
	308	if (read_write == I2C_SMBUS_WRITE)
	309	return 0;
	310
	311	switch (size) {
1da177e4 LT	312	case I2C_SMBUS_BYTE:
	313	case I2C_SMBUS_BYTE_DATA:
	314	amd_ec_read(smbus, AMD_SMB_DATA, &data->byte);
	315	break;
	316
	317	case I2C_SMBUS_WORD_DATA:
	318	case I2C_SMBUS_PROC_CALL:
	319	amd_ec_read(smbus, AMD_SMB_DATA, temp + 0);
	320	amd_ec_read(smbus, AMD_SMB_DATA + 1, temp + 1);
	321	data->word = (temp[1] << 8) \| temp[0];
	322	break;
	323
	324	case I2C_SMBUS_BLOCK_DATA:
	325	case I2C_SMBUS_BLOCK_PROC_CALL:
	326	amd_ec_read(smbus, AMD_SMB_BCNT, &len);
88b9e750	327	len = min_t(u8, len, I2C_SMBUS_BLOCK_MAX);
1da177e4 LT	328	case I2C_SMBUS_I2C_BLOCK_DATA:
1da177e4 LT	329	for (i = 0; i < len; i++)
88b9e750 JD	330	amd_ec_read(smbus, AMD_SMB_DATA + i,
88b9e750 JD	331	data->block + i + 1);
1da177e4 LT	332	data->block[0] = len;
	333	break;
	334	}
	335
	336	return 0;
	337	}
	338
	339
	340	static u32 amd8111_func(struct i2c_adapter *adapter)
	341	{
88b9e750 JD	342	return I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
88b9e750 JD	343	I2C_FUNC_SMBUS_BYTE_DATA \|
1da177e4 LT	344	I2C_FUNC_SMBUS_WORD_DATA \| I2C_FUNC_SMBUS_BLOCK_DATA \|
1da177e4 LT	345	I2C_FUNC_SMBUS_PROC_CALL \| I2C_FUNC_SMBUS_BLOCK_PROC_CALL \|
6662cbb9	346	I2C_FUNC_SMBUS_I2C_BLOCK \| I2C_FUNC_SMBUS_PEC;
1da177e4 LT	347	}
1da177e4 LT	348
8f9082c5	349	static const struct i2c_algorithm smbus_algorithm = {
1da177e4 LT	350	.smbus_xfer = amd8111_access,
	351	.functionality = amd8111_func,
	352	};
	353
	354
4111ecd2	355	static const struct pci_device_id amd8111_ids[] = {
1da177e4 LT	356	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS2) },
	357	{ 0, }
	358	};
	359
	360	MODULE_DEVICE_TABLE (pci, amd8111_ids);
	361
88b9e750 JD	362	static int __devinit amd8111_probe(struct pci_dev *dev,
88b9e750 JD	363	const struct pci_device_id *id)
1da177e4 LT	364	{
1da177e4 LT	365	struct amd_smbus *smbus;
88b9e750	366	int error;
1da177e4	367
88b9e750	368	if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
1da177e4 LT	369	return -ENODEV;
1da177e4 LT	370
5263ebb5	371	smbus = kzalloc(sizeof(struct amd_smbus), GFP_KERNEL);
1da177e4 LT	372	if (!smbus)
1da177e4 LT	373	return -ENOMEM;
1da177e4 LT	374
	375	smbus->dev = dev;
	376	smbus->base = pci_resource_start(dev, 0);
	377	smbus->size = pci_resource_len(dev, 0);
	378
54fb4a05	379	error = acpi_check_resource_conflict(&dev->resource[0]);
18669eab JD	380	if (error) {
18669eab JD	381	error = -ENODEV;
54fb4a05	382	goto out_kfree;
18669eab	383	}
54fb4a05	384
88b9e750 JD	385	if (!request_region(smbus->base, smbus->size, amd8111_driver.name)) {
88b9e750 JD	386	error = -EBUSY;
1da177e4	387	goto out_kfree;
88b9e750	388	}
1da177e4 LT	389
1da177e4 LT	390	smbus->adapter.owner = THIS_MODULE;
2096b956	391	snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
1da177e4	392	"SMBus2 AMD8111 adapter at %04x", smbus->base);
3401b2ff	393	smbus->adapter.class = I2C_CLASS_HWMON \| I2C_CLASS_SPD;
1da177e4 LT	394	smbus->adapter.algo = &smbus_algorithm;
	395	smbus->adapter.algo_data = smbus;
	396
405ae7d3	397	/* set up the sysfs linkage to our parent device */
1da177e4 LT	398	smbus->adapter.dev.parent = &dev->dev;
1da177e4 LT	399
88b9e750	400	pci_write_config_dword(smbus->dev, AMD_PCI_MISC, 0);
1da177e4 LT	401	error = i2c_add_adapter(&smbus->adapter);
	402	if (error)
	403	goto out_release_region;
	404
1da177e4 LT	405	pci_set_drvdata(dev, smbus);
	406	return 0;
	407
	408	out_release_region:
	409	release_region(smbus->base, smbus->size);
	410	out_kfree:
	411	kfree(smbus);
88b9e750	412	return error;
1da177e4 LT	413	}
1da177e4 LT	414
1da177e4 LT	415	static void __devexit amd8111_remove(struct pci_dev *dev)
	416	{
	417	struct amd_smbus *smbus = pci_get_drvdata(dev);
	418
	419	i2c_del_adapter(&smbus->adapter);
	420	release_region(smbus->base, smbus->size);
	421	kfree(smbus);
	422	}
	423
	424	static struct pci_driver amd8111_driver = {
	425	.name = "amd8111_smbus2",
	426	.id_table = amd8111_ids,
	427	.probe = amd8111_probe,
	428	.remove = __devexit_p(amd8111_remove),
	429	};
	430
	431	static int __init i2c_amd8111_init(void)
	432	{
	433	return pci_register_driver(&amd8111_driver);
	434	}
	435
1da177e4 LT	436	static void __exit i2c_amd8111_exit(void)
	437	{
	438	pci_unregister_driver(&amd8111_driver);
	439	}
	440
	441	module_init(i2c_amd8111_init);
	442	module_exit(i2c_amd8111_exit);