mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Guenter Roeck](/assets/img/avatar_default.png)
Sibyte i2c bus driver returns non-descriptive error values. Update to return error values as defined in Documentation/i2c/fault-codes. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
198 lines
5.6 KiB
C
198 lines
5.6 KiB
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 <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");
|