[net-next-2.6.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.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <asm/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 -1;      /* XXXKW better error code? */
	}

	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 -1;      /* XXXKW better error code? */
	}

	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.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	19	*/
	20
51c37117	21	#include <linux/kernel.h>
1da177e4	22	#include <linux/module.h>
51c37117 JD	23	#include <linux/init.h>
	24	#include <linux/i2c.h>
	25	#include <asm/io.h>
1da177e4 LT	26	#include <asm/sibyte/sb1250_regs.h>
	27	#include <asm/sibyte/sb1250_smbus.h>
	28
51c37117 JD	29
	30	struct i2c_algo_sibyte_data {
	31	void data; / private data */
	32	int bus; /* which bus */
	33	void reg_base; / CSR base */
	34	};
	35
	36	/* ----- global defines ----------------------------------------------- */
	37	#define SMB_CSR(a,r) ((long)(a->reg_base + r))
	38
51c37117 JD	39
	40	static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr,
	41	unsigned short flags, char read_write,
	42	u8 command, int size, union i2c_smbus_data * data)
	43	{
	44	struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
	45	int data_bytes = 0;
	46	int error;
	47
	48	while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
	49	;
	50
	51	switch (size) {
	52	case I2C_SMBUS_QUICK:
	53	csr_out32((V_SMB_ADDR(addr) \|
	54	(read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) \|
	55	V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START));
	56	break;
	57	case I2C_SMBUS_BYTE:
	58	if (read_write == I2C_SMBUS_READ) {
	59	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_RD1BYTE),
	60	SMB_CSR(adap, R_SMB_START));
	61	data_bytes = 1;
	62	} else {
	63	csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
	64	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_WR1BYTE),
	65	SMB_CSR(adap, R_SMB_START));
	66	}
	67	break;
	68	case I2C_SMBUS_BYTE_DATA:
	69	csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
	70	if (read_write == I2C_SMBUS_READ) {
	71	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_CMD_RD1BYTE),
	72	SMB_CSR(adap, R_SMB_START));
	73	data_bytes = 1;
	74	} else {
	75	csr_out32(V_SMB_LB(data->byte),
	76	SMB_CSR(adap, R_SMB_DATA));
	77	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_WR2BYTE),
	78	SMB_CSR(adap, R_SMB_START));
	79	}
	80	break;
	81	case I2C_SMBUS_WORD_DATA:
	82	csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
	83	if (read_write == I2C_SMBUS_READ) {
	84	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_CMD_RD2BYTE),
	85	SMB_CSR(adap, R_SMB_START));
	86	data_bytes = 2;
	87	} else {
	88	csr_out32(V_SMB_LB(data->word & 0xff),
	89	SMB_CSR(adap, R_SMB_DATA));
	90	csr_out32(V_SMB_MB(data->word >> 8),
	91	SMB_CSR(adap, R_SMB_DATA));
	92	csr_out32((V_SMB_ADDR(addr) \| V_SMB_TT_WR2BYTE),
	93	SMB_CSR(adap, R_SMB_START));
	94	}
	95	break;
	96	default:
	97	return -1; /* XXXKW better error code? */
	98	}
	99
	100	while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
	101	;
	102
103	error = csr_in32(SMB_CSR(adap, R_SMB_STATUS));
104	if (error & M_SMB_ERROR) {
105	/* Clear error bit by writing a 1 */
106	csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS));
107	return -1; /* XXXKW better error code? */
108	}
109
110	if (data_bytes == 1)
111	data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff;
112	if (data_bytes == 2)
113	data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff;
114
115	return 0;
116	}
117
118	static u32 bit_func(struct i2c_adapter *adap)
119	{
120	return (I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
121	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA);
122	}
123
124
125	/* -----exported algorithm data: ------------------------------------- */
126
8f9082c5	127	static const struct i2c_algorithm i2c_sibyte_algo = {
51c37117 JD	128	.smbus_xfer = smbus_xfer,
	129	.functionality = bit_func,
	130	};
	131
	132	/*
	133	* registering functions to load algorithms at runtime
	134	*/
b11a9d83	135	static int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
51c37117	136	{
51c37117 JD	137	struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
51c37117 JD	138
b3eb5a0b	139	/* Register new adapter to i2c module... */
51c37117 JD	140	i2c_adap->algo = &i2c_sibyte_algo;
51c37117 JD	141
b3eb5a0b	142	/* Set the requested frequency. */
51c37117 JD	143	csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ));
	144	csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL));
	145
392a0408	146	return i2c_add_numbered_adapter(i2c_adap);
51c37117 JD	147	}
	148
	149
1da177e4	150	static struct i2c_algo_sibyte_data sibyte_board_data[2] = {
a242b44d RB	151	{ NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) },
a242b44d RB	152	{ NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) }
1da177e4 LT	153	};
	154
	155	static struct i2c_adapter sibyte_board_adapter[2] = {
	156	{
	157	.owner = THIS_MODULE,
3401b2ff	158	.class = I2C_CLASS_HWMON \| I2C_CLASS_SPD,
1da177e4 LT	159	.algo = NULL,
1da177e4 LT	160	.algo_data = &sibyte_board_data[0],
392a0408	161	.nr = 0,
1da177e4 LT	162	.name = "SiByte SMBus 0",
	163	},
	164	{
	165	.owner = THIS_MODULE,
3401b2ff	166	.class = I2C_CLASS_HWMON \| I2C_CLASS_SPD,
1da177e4 LT	167	.algo = NULL,
1da177e4 LT	168	.algo_data = &sibyte_board_data[1],
392a0408	169	.nr = 1,
1da177e4 LT	170	.name = "SiByte SMBus 1",
	171	},
	172	};
	173
	174	static int __init i2c_sibyte_init(void)
	175	{
5cd6e675	176	pr_info("i2c-sibyte: i2c SMBus adapter module for SiByte board\n");
1da177e4 LT	177	if (i2c_sibyte_add_bus(&sibyte_board_adapter[0], K_SMB_FREQ_100KHZ) < 0)
1da177e4 LT	178	return -ENODEV;
5cd6e675 JD	179	if (i2c_sibyte_add_bus(&sibyte_board_adapter[1],
	180	K_SMB_FREQ_400KHZ) < 0) {
	181	i2c_del_adapter(&sibyte_board_adapter[0]);
1da177e4	182	return -ENODEV;
5cd6e675	183	}
1da177e4 LT	184	return 0;
	185	}
	186
	187	static void __exit i2c_sibyte_exit(void)
	188	{
ae1390d8 YY	189	i2c_del_adapter(&sibyte_board_adapter[0]);
ae1390d8 YY	190	i2c_del_adapter(&sibyte_board_adapter[1]);
1da177e4 LT	191	}
	192
	193	module_init(i2c_sibyte_init);
	194	module_exit(i2c_sibyte_exit);
	195
643bd3fb	196	MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>");
1da177e4 LT	197	MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards");
1da177e4 LT	198	MODULE_LICENSE("GPL");