mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-27 20:38:52 +09:00
![Heiko Schocher](/assets/img/avatar_default.png)
The U-Boot Design Principles[1] clearly say: Initialize devices only when they are needed within U-Boot, i.e. don't initialize the Ethernet interface(s) unless U-Boot performs a download over Ethernet; don't initialize any IDE or USB devices unless U-Boot actually tries to load files from these, etc. (and don't forget to shut down these devices after using them - otherwise nasty things may happen when you try to boot your OS). So, do not initialize and read the sensors on startup. Signed-off-by: Heiko Schocher <hs@denx.de> cc: Wolfgang Denk <wd@denx.de> cc: Holger Brunck <holger.brunck@keymile.com>
178 lines
3.7 KiB
C
178 lines
3.7 KiB
C
/*
|
|
* (C) Copyright 2007-2008
|
|
* Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de
|
|
* based on lm75.c by Bill Hunter
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/*
|
|
* 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 < sizeof(pwm_lookup) / sizeof(struct pwm_lookup_entry);
|
|
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;
|
|
}
|