mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-27 05:23:34 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
160 lines
2.9 KiB
C
160 lines
2.9 KiB
C
/*
|
|
* (C) Copyright 2007-2008
|
|
* Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de
|
|
* based on lm75.c by Bill Hunter
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
/*
|
|
* National LM63/LM64 Temperature Sensor
|
|
* Main difference: LM 64 has -16 Kelvin temperature offset
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <i2c.h>
|
|
#include <dtt.h>
|
|
|
|
#define DTT_I2C_LM63_ADDR 0x4C /* National LM63 device */
|
|
|
|
#define DTT_READ_TEMP_RMT_MSB 0x01
|
|
#define DTT_CONFIG 0x03
|
|
#define DTT_READ_TEMP_RMT_LSB 0x10
|
|
#define DTT_TACHLIM_LSB 0x48
|
|
#define DTT_TACHLIM_MSB 0x49
|
|
#define DTT_FAN_CONFIG 0x4A
|
|
#define DTT_PWM_FREQ 0x4D
|
|
#define DTT_PWM_LOOKUP_BASE 0x50
|
|
|
|
struct pwm_lookup_entry {
|
|
u8 temp;
|
|
u8 pwm;
|
|
};
|
|
|
|
/*
|
|
* Device code
|
|
*/
|
|
|
|
int dtt_read(int sensor, int reg)
|
|
{
|
|
int dlen;
|
|
uchar data[2];
|
|
|
|
/*
|
|
* Calculate sensor address and register.
|
|
*/
|
|
if (!sensor)
|
|
sensor = DTT_I2C_LM63_ADDR; /* legacy config */
|
|
|
|
dlen = 1;
|
|
|
|
/*
|
|
* Now try to read the register.
|
|
*/
|
|
if (i2c_read(sensor, reg, 1, data, dlen) != 0)
|
|
return -1;
|
|
|
|
return (int)data[0];
|
|
} /* dtt_read() */
|
|
|
|
int dtt_write(int sensor, int reg, int val)
|
|
{
|
|
int dlen;
|
|
uchar data[2];
|
|
|
|
/*
|
|
* Calculate sensor address and register.
|
|
*/
|
|
if (!sensor)
|
|
sensor = DTT_I2C_LM63_ADDR; /* legacy config */
|
|
|
|
dlen = 1;
|
|
data[0] = (char)(val & 0xff);
|
|
|
|
/*
|
|
* Write value to register.
|
|
*/
|
|
if (i2c_write(sensor, reg, 1, data, dlen) != 0)
|
|
return 1;
|
|
|
|
return 0;
|
|
} /* dtt_write() */
|
|
|
|
static int is_lm64(int sensor)
|
|
{
|
|
return sensor && (sensor != DTT_I2C_LM63_ADDR);
|
|
}
|
|
|
|
int dtt_init_one(int sensor)
|
|
{
|
|
int i;
|
|
int val;
|
|
|
|
struct pwm_lookup_entry pwm_lookup[] = CONFIG_DTT_PWM_LOOKUPTABLE;
|
|
|
|
/*
|
|
* Set PWM Frequency to 2.5% resolution
|
|
*/
|
|
val = 20;
|
|
if (dtt_write(sensor, DTT_PWM_FREQ, val) != 0)
|
|
return 1;
|
|
|
|
/*
|
|
* Set Tachometer Limit
|
|
*/
|
|
val = CONFIG_DTT_TACH_LIMIT;
|
|
if (dtt_write(sensor, DTT_TACHLIM_LSB, val & 0xff) != 0)
|
|
return 1;
|
|
if (dtt_write(sensor, DTT_TACHLIM_MSB, (val >> 8) & 0xff) != 0)
|
|
return 1;
|
|
|
|
/*
|
|
* Make sure PWM Lookup-Table is writeable
|
|
*/
|
|
if (dtt_write(sensor, DTT_FAN_CONFIG, 0x20) != 0)
|
|
return 1;
|
|
|
|
/*
|
|
* Setup PWM Lookup-Table
|
|
*/
|
|
for (i = 0; i < ARRAY_SIZE(pwm_lookup); i++) {
|
|
int address = DTT_PWM_LOOKUP_BASE + 2 * i;
|
|
val = pwm_lookup[i].temp;
|
|
if (is_lm64(sensor))
|
|
val -= 16;
|
|
if (dtt_write(sensor, address, val) != 0)
|
|
return 1;
|
|
val = dtt_read(sensor, address);
|
|
val = pwm_lookup[i].pwm;
|
|
if (dtt_write(sensor, address + 1, val) != 0)
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Enable PWM Lookup-Table, PWM Clock 360 kHz, Tachometer Mode 2
|
|
*/
|
|
val = 0x02;
|
|
if (dtt_write(sensor, DTT_FAN_CONFIG, val) != 0)
|
|
return 1;
|
|
|
|
/*
|
|
* Enable Tach input
|
|
*/
|
|
val = dtt_read(sensor, DTT_CONFIG) | 0x04;
|
|
if (dtt_write(sensor, DTT_CONFIG, val) != 0)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dtt_get_temp(int sensor)
|
|
{
|
|
s16 temp = (dtt_read(sensor, DTT_READ_TEMP_RMT_MSB) << 8)
|
|
| (dtt_read(sensor, DTT_READ_TEMP_RMT_LSB));
|
|
|
|
if (is_lm64(sensor))
|
|
temp += 16 << 8;
|
|
|
|
/* Ignore LSB for now, U-Boot only prints natural numbers */
|
|
return temp >> 8;
|
|
}
|