/* ------------------------------------------------------------------------- *//* i2c-algo-sibyte.c i2c driver algorithms for bit-shift adapters		     *//* ------------------------------------------------------------------------- *//*   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., 675 Mass Ave, Cambridge, MA 02139, USA.		     *//* ------------------------------------------------------------------------- *//* With some changes from Ky鰏ti M鋖kki <kmalkki@cc.hut.fi> and even   Frodo Looijaard <frodol@dds.nl>.  *//* Ported for SiByte SOCs by Broadcom Corporation.  */#include <linux/config.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <asm/io.h>#include <asm/sibyte/sb1250_regs.h>#include <asm/sibyte/sb1250_smbus.h>#include <linux/i2c.h>#include <linux/i2c-algo-sibyte.h>/* ----- global defines ----------------------------------------------- */#define SMB_CSR(a,r) ((long)(a->reg_base + r))/* ----- global variables ---------------------------------------------	*//* module parameters: */static int bit_scan=0;	/* have a look at what's hanging 'round		*/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 int algo_control(struct i2c_adapter *adapter, 	unsigned int cmd, unsigned long arg){	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 struct i2c_algorithm i2c_sibyte_algo = {	.name		= "SiByte algorithm",	.id		= I2C_ALGO_SIBYTE,	.smbus_xfer	= smbus_xfer,	.algo_control	= algo_control, /* ioctl */	.functionality	= bit_func,};/*  * registering functions to load algorithms at runtime  */int i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed){	int i;	struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;	/* register new adapter to i2c module... */	i2c_adap->id |= i2c_sibyte_algo.id;	i2c_adap->algo = &i2c_sibyte_algo;                /* Set the frequency to 100 kHz */        csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ));        csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL));	/* scan bus */	if (bit_scan) {                union i2c_smbus_data data;                int rc;		printk(KERN_INFO " i2c-algo-sibyte.o: scanning bus %s.\n",		       i2c_adap->name);		for (i = 0x00; i < 0x7f; i++) {                        /* XXXKW is this a realistic probe? */                        rc = smbus_xfer(i2c_adap, i, 0, I2C_SMBUS_READ, 0,                                        I2C_SMBUS_BYTE_DATA, &data);			if (!rc) {				printk("(%02x)",i); 			} else 				printk("."); 		}		printk("\n");	}	i2c_add_adapter(i2c_adap);	return 0;}int i2c_sibyte_del_bus(struct i2c_adapter *adap){	int res;	if ((res = i2c_del_adapter(adap)) < 0)		return res;	return 0;}int __init i2c_algo_sibyte_init (void){	printk("i2c-algo-sibyte.o: i2c SiByte algorithm module\n");	return 0;}EXPORT_SYMBOL(i2c_sibyte_add_bus);EXPORT_SYMBOL(i2c_sibyte_del_bus);#ifdef MODULEMODULE_AUTHOR("Kip Walker, Broadcom Corp.");MODULE_DESCRIPTION("SiByte I2C-Bus algorithm");MODULE_PARM(bit_scan, "i");MODULE_PARM_DESC(bit_scan, "Scan for active chips on the bus");MODULE_LICENSE("GPL");int init_module(void) {	return i2c_algo_sibyte_init();}void cleanup_module(void) {}#endif