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

/*
 * Copyright (C) 2004 Steven J. Hill
 * Copyright (C) 2001,2002,2003 Broadcom Corporation
 * Copyright (C) 1995-2000 Simon G. Vogl
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/io.h>
#include <asm/sibyte/sb1250_regs.h>
#include <asm/sibyte/sb1250_smbus.h>


struct i2c_algo_sibyte_data {
	void *data;		/* private data */
	int   bus;		/* which bus */
	void *reg_base;		/* CSR base */
};

/* ----- global defines ----------------------------------------------- */
#define SMB_CSR(a,r) ((long)(a->reg_base + r))


static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr,
		      unsigned short flags, char read_write,
		      u8 command, int size, union i2c_smbus_data * data)
{
	struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
	int data_bytes = 0;
	int error;

	while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
		;

	switch (size) {
	case I2C_SMBUS_QUICK:
		csr_out32((V_SMB_ADDR(addr) |
			   (read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) |
			   V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START));
		break;
	case I2C_SMBUS_BYTE:
		if (read_write == I2C_SMBUS_READ) {
			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_RD1BYTE),
				  SMB_CSR(adap, R_SMB_START));
			data_bytes = 1;
		} else {
			csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR1BYTE),
				  SMB_CSR(adap, R_SMB_START));
		}
		break;
	case I2C_SMBUS_BYTE_DATA:
		csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
		if (read_write == I2C_SMBUS_READ) {
			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD1BYTE),
				  SMB_CSR(adap, R_SMB_START));
			data_bytes = 1;
		} else {
			csr_out32(V_SMB_LB(data->byte),
				  SMB_CSR(adap, R_SMB_DATA));
			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE),
				  SMB_CSR(adap, R_SMB_START));
		}
		break;
	case I2C_SMBUS_WORD_DATA:
		csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
		if (read_write == I2C_SMBUS_READ) {
			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD2BYTE),
				  SMB_CSR(adap, R_SMB_START));
			data_bytes = 2;
		} else {
			csr_out32(V_SMB_LB(data->word & 0xff),
				  SMB_CSR(adap, R_SMB_DATA));
			csr_out32(V_SMB_MB(data->word >> 8),
				  SMB_CSR(adap, R_SMB_DATA));
			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE),
				  SMB_CSR(adap, R_SMB_START));
		}
		break;
	default:
		return -EOPNOTSUPP;
	}

	while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
		;

	error = csr_in32(SMB_CSR(adap, R_SMB_STATUS));
	if (error & M_SMB_ERROR) {
		/* Clear error bit by writing a 1 */
		csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS));
		return (error & M_SMB_ERROR_TYPE) ? -EIO : -ENXIO;
	}

	if (data_bytes == 1)
		data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff;
	if (data_bytes == 2)
		data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff;

	return 0;
}

static u32 bit_func(struct i2c_adapter *adap)
{
	return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
		I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA);
}


/* -----exported algorithm data: -------------------------------------	*/

static const struct i2c_algorithm i2c_sibyte_algo = {
	.smbus_xfer	= smbus_xfer,
	.functionality	= bit_func,
};

/*
 * registering functions to load algorithms at runtime
 */
static int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
{
	struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;

	/* Register new adapter to i2c module... */
	i2c_adap->algo = &i2c_sibyte_algo;

	/* Set the requested frequency. */
	csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ));
	csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL));

	return i2c_add_numbered_adapter(i2c_adap);
}


static struct i2c_algo_sibyte_data sibyte_board_data[2] = {
	{ NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) },
	{ NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) }
};

static struct i2c_adapter sibyte_board_adapter[2] = {
	{
		.owner		= THIS_MODULE,
		.class		= I2C_CLASS_HWMON | I2C_CLASS_SPD,
		.algo		= NULL,
		.algo_data	= &sibyte_board_data[0],
		.nr		= 0,
		.name		= "SiByte SMBus 0",
	},
	{
		.owner		= THIS_MODULE,
		.class		= I2C_CLASS_HWMON | I2C_CLASS_SPD,
		.algo		= NULL,
		.algo_data	= &sibyte_board_data[1],
		.nr		= 1,
		.name		= "SiByte SMBus 1",
	},
};

static int __init i2c_sibyte_init(void)
{
	pr_info("i2c-sibyte: i2c SMBus adapter module for SiByte board\n");
	if (i2c_sibyte_add_bus(&sibyte_board_adapter[0], K_SMB_FREQ_100KHZ) < 0)
		return -ENODEV;
	if (i2c_sibyte_add_bus(&sibyte_board_adapter[1],
			       K_SMB_FREQ_400KHZ) < 0) {
		i2c_del_adapter(&sibyte_board_adapter[0]);
		return -ENODEV;
	}
	return 0;
}

static void __exit i2c_sibyte_exit(void)
{
	i2c_del_adapter(&sibyte_board_adapter[0]);
	i2c_del_adapter(&sibyte_board_adapter[1]);
}

module_init(i2c_sibyte_init);
module_exit(i2c_sibyte_exit);

MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>");
MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) 2004 Steven J. Hill
	3	* Copyright (C) 2001,2002,2003 Broadcom Corporation
51c37117	4	* Copyright (C) 1995-2000 Simon G. Vogl
1da177e4 LT	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version 2
	9	* of the License, or (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
1da177e4 LT	15	*/
1da177e4 LT	16
51c37117	17	#include <linux/kernel.h>
1da177e4	18	#include <linux/module.h>
51c37117 JD	19	#include <linux/init.h>
51c37117 JD	20	#include <linux/i2c.h>
21782180	21	#include <linux/io.h>
1da177e4 LT	22	#include <asm/sibyte/sb1250_regs.h>
	23	#include <asm/sibyte/sb1250_smbus.h>
	24
51c37117 JD	25
	26	struct i2c_algo_sibyte_data {
	27	void data; / private data */
	28	int bus; /* which bus */
	29	void reg_base; / CSR base */
	30	};
	31
	32	/* ----- global defines ----------------------------------------------- */
	33	#define SMB_CSR(a,r) ((long)(a->reg_base + r))
	34
51c37117 JD	35
	36	static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr,
	37	unsigned short flags, char read_write,
	38	u8 command, int size, union i2c_smbus_data * data)
	39	{
	40	struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
	41	int data_bytes = 0;
	42	int error;
	43
	44	while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
	45	;
	46
	47	switch (size) {
	48	case I2C_SMBUS_QUICK:
	49	csr_out32((V_SMB_ADDR(addr) \|
	50	(read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) \|
	51	V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START));
	52	break;
	53	case I2C_SMBUS_BYTE:
	54	if (read_write == I2C_SMBUS_READ) {
	55	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_RD1BYTE),
	56	SMB_CSR(adap, R_SMB_START));
	57	data_bytes = 1;
	58	} else {
	59	csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
	60	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_WR1BYTE),
	61	SMB_CSR(adap, R_SMB_START));
	62	}
	63	break;
	64	case I2C_SMBUS_BYTE_DATA:
	65	csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
	66	if (read_write == I2C_SMBUS_READ) {
	67	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_CMD_RD1BYTE),
	68	SMB_CSR(adap, R_SMB_START));
	69	data_bytes = 1;
	70	} else {
	71	csr_out32(V_SMB_LB(data->byte),
	72	SMB_CSR(adap, R_SMB_DATA));
	73	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_WR2BYTE),
	74	SMB_CSR(adap, R_SMB_START));
	75	}
	76	break;
	77	case I2C_SMBUS_WORD_DATA:
	78	csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
	79	if (read_write == I2C_SMBUS_READ) {
	80	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_CMD_RD2BYTE),
	81	SMB_CSR(adap, R_SMB_START));
	82	data_bytes = 2;
	83	} else {
	84	csr_out32(V_SMB_LB(data->word & 0xff),
	85	SMB_CSR(adap, R_SMB_DATA));
	86	csr_out32(V_SMB_MB(data->word >> 8),
	87	SMB_CSR(adap, R_SMB_DATA));
	88	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_WR2BYTE),
	89	SMB_CSR(adap, R_SMB_START));
	90	}
	91	break;
	92	default:
102b59c6	93	return -EOPNOTSUPP;
51c37117 JD	94	}
	95
	96	while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
	97	;
	98
	99	error = csr_in32(SMB_CSR(adap, R_SMB_STATUS));
	100	if (error & M_SMB_ERROR) {
	101	/* Clear error bit by writing a 1 */
	102	csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS));
102b59c6	103	return (error & M_SMB_ERROR_TYPE) ? -EIO : -ENXIO;
51c37117 JD	104	}
	105
	106	if (data_bytes == 1)
	107	data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff;
	108	if (data_bytes == 2)
	109	data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff;
	110
	111	return 0;
	112	}
	113
	114	static u32 bit_func(struct i2c_adapter *adap)
	115	{
	116	return (I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
	117	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA);
	118	}
	119
	120
	121	/* -----exported algorithm data: ------------------------------------- */
	122
8f9082c5	123	static const struct i2c_algorithm i2c_sibyte_algo = {
51c37117 JD	124	.smbus_xfer = smbus_xfer,
	125	.functionality = bit_func,
	126	};
	127
	128	/*
	129	* registering functions to load algorithms at runtime
	130	*/
b11a9d83	131	static int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
51c37117	132	{
51c37117 JD	133	struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
51c37117 JD	134
b3eb5a0b	135	/* Register new adapter to i2c module... */
51c37117 JD	136	i2c_adap->algo = &i2c_sibyte_algo;
51c37117 JD	137
b3eb5a0b	138	/* Set the requested frequency. */
51c37117 JD	139	csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ));
	140	csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL));
	141
392a0408	142	return i2c_add_numbered_adapter(i2c_adap);
51c37117 JD	143	}
	144
	145
1da177e4	146	static struct i2c_algo_sibyte_data sibyte_board_data[2] = {
a242b44d RB	147	{ NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) },
a242b44d RB	148	{ NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) }
1da177e4 LT	149	};
	150
	151	static struct i2c_adapter sibyte_board_adapter[2] = {
	152	{
	153	.owner = THIS_MODULE,
3401b2ff	154	.class = I2C_CLASS_HWMON \| I2C_CLASS_SPD,
1da177e4 LT	155	.algo = NULL,
1da177e4 LT	156	.algo_data = &sibyte_board_data[0],
392a0408	157	.nr = 0,
1da177e4 LT	158	.name = "SiByte SMBus 0",
	159	},
	160	{
	161	.owner = THIS_MODULE,
3401b2ff	162	.class = I2C_CLASS_HWMON \| I2C_CLASS_SPD,
1da177e4 LT	163	.algo = NULL,
1da177e4 LT	164	.algo_data = &sibyte_board_data[1],
392a0408	165	.nr = 1,
1da177e4 LT	166	.name = "SiByte SMBus 1",
	167	},
	168	};
	169
	170	static int __init i2c_sibyte_init(void)
	171	{
5cd6e675	172	pr_info("i2c-sibyte: i2c SMBus adapter module for SiByte board\n");
1da177e4 LT	173	if (i2c_sibyte_add_bus(&sibyte_board_adapter[0], K_SMB_FREQ_100KHZ) < 0)
1da177e4 LT	174	return -ENODEV;
5cd6e675 JD	175	if (i2c_sibyte_add_bus(&sibyte_board_adapter[1],
	176	K_SMB_FREQ_400KHZ) < 0) {
	177	i2c_del_adapter(&sibyte_board_adapter[0]);
1da177e4	178	return -ENODEV;
5cd6e675	179	}
1da177e4 LT	180	return 0;
	181	}
	182
	183	static void __exit i2c_sibyte_exit(void)
	184	{
ae1390d8 YY	185	i2c_del_adapter(&sibyte_board_adapter[0]);
ae1390d8 YY	186	i2c_del_adapter(&sibyte_board_adapter[1]);
1da177e4 LT	187	}
	188
	189	module_init(i2c_sibyte_init);
	190	module_exit(i2c_sibyte_exit);
	191
643bd3fb	192	MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>");
1da177e4 LT	193	MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards");
1da177e4 LT	194	MODULE_LICENSE("GPL");