Release 4.7 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jean delvare | jean delvare | 476 | 97.74% | 1 | 50.00% |
| guenter roeck | guenter roeck | 11 | 2.26% | 1 | 50.00% |
| Total | 487 | 100.00% | 2 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jean delvare | jean delvare | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
/* -----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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jean delvare | jean delvare | 59 | 93.65% | 2 | 40.00% |
| maciej w. rozycki | maciej w. rozycki | 4 | 6.35% | 3 | 60.00% |
| Total | 63 | 100.00% | 5 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| steven j. hill | steven j. hill | 53 | 80.30% | 1 | 50.00% |
| jean delvare | jean delvare | 13 | 19.70% | 1 | 50.00% |
| Total | 66 | 100.00% | 2 | 100.00% |
static void __exit i2c_sibyte_exit(void)
{
i2c_del_adapter(&sibyte_board_adapter[0]);
i2c_del_adapter(&sibyte_board_adapter[1]);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| steven j. hill | steven j. hill | 25 | 92.59% | 1 | 50.00% |
| yoichi yuasa | yoichi yuasa | 2 | 7.41% | 1 | 50.00% |
| Total | 27 | 100.00% | 2 | 100.00% |
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");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jean delvare | jean delvare | 633 | 70.73% | 6 | 40.00% |
| steven j. hill | steven j. hill | 231 | 25.81% | 1 | 6.67% |
| maciej w. rozycki | maciej w. rozycki | 14 | 1.56% | 3 | 20.00% |
| guenter roeck | guenter roeck | 11 | 1.23% | 1 | 6.67% |
| yoichi yuasa | yoichi yuasa | 2 | 0.22% | 1 | 6.67% |
| ralf baechle | ralf baechle | 2 | 0.22% | 1 | 6.67% |
| h hartley sweeten | h hartley sweeten | 1 | 0.11% | 1 | 6.67% |
| wolfram sang | wolfram sang | 1 | 0.11% | 1 | 6.67% |
| Total | 895 | 100.00% | 15 | 100.00% |
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