mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 05:04:26 +00:00
780f13a9e1
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>
177 lines
3.7 KiB
C
177 lines
3.7 KiB
C
/*
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* (C) Copyright 2007-2008
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* Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de
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* based on lm75.c by Bill Hunter
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* National LM63/LM64 Temperature Sensor
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* Main difference: LM 64 has -16 Kelvin temperature offset
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*/
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#include <common.h>
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#include <i2c.h>
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#include <dtt.h>
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#define DTT_I2C_LM63_ADDR 0x4C /* National LM63 device */
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#define DTT_READ_TEMP_RMT_MSB 0x01
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#define DTT_CONFIG 0x03
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#define DTT_READ_TEMP_RMT_LSB 0x10
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#define DTT_TACHLIM_LSB 0x48
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#define DTT_TACHLIM_MSB 0x49
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#define DTT_FAN_CONFIG 0x4A
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#define DTT_PWM_FREQ 0x4D
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#define DTT_PWM_LOOKUP_BASE 0x50
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struct pwm_lookup_entry {
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u8 temp;
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u8 pwm;
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};
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/*
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* Device code
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*/
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int dtt_read(int sensor, int reg)
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{
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int dlen;
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uchar data[2];
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/*
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* Calculate sensor address and register.
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*/
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if (!sensor)
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sensor = DTT_I2C_LM63_ADDR; /* legacy config */
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dlen = 1;
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/*
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* Now try to read the register.
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*/
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if (i2c_read(sensor, reg, 1, data, dlen) != 0)
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return -1;
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return (int)data[0];
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} /* dtt_read() */
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int dtt_write(int sensor, int reg, int val)
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{
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int dlen;
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uchar data[2];
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/*
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* Calculate sensor address and register.
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*/
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if (!sensor)
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sensor = DTT_I2C_LM63_ADDR; /* legacy config */
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dlen = 1;
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data[0] = (char)(val & 0xff);
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/*
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* Write value to register.
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*/
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if (i2c_write(sensor, reg, 1, data, dlen) != 0)
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return 1;
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return 0;
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} /* dtt_write() */
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static int is_lm64(int sensor)
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{
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return sensor && (sensor != DTT_I2C_LM63_ADDR);
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}
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int dtt_init_one(int sensor)
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{
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int i;
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int val;
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struct pwm_lookup_entry pwm_lookup[] = CONFIG_DTT_PWM_LOOKUPTABLE;
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/*
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* Set PWM Frequency to 2.5% resolution
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*/
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val = 20;
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if (dtt_write(sensor, DTT_PWM_FREQ, val) != 0)
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return 1;
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/*
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* Set Tachometer Limit
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*/
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val = CONFIG_DTT_TACH_LIMIT;
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if (dtt_write(sensor, DTT_TACHLIM_LSB, val & 0xff) != 0)
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return 1;
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if (dtt_write(sensor, DTT_TACHLIM_MSB, (val >> 8) & 0xff) != 0)
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return 1;
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/*
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* Make sure PWM Lookup-Table is writeable
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*/
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if (dtt_write(sensor, DTT_FAN_CONFIG, 0x20) != 0)
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return 1;
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/*
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* Setup PWM Lookup-Table
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*/
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for (i = 0; i < sizeof(pwm_lookup) / sizeof(struct pwm_lookup_entry);
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i++) {
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int address = DTT_PWM_LOOKUP_BASE + 2 * i;
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val = pwm_lookup[i].temp;
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if (is_lm64(sensor))
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val -= 16;
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if (dtt_write(sensor, address, val) != 0)
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return 1;
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val = dtt_read(sensor, address);
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val = pwm_lookup[i].pwm;
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if (dtt_write(sensor, address + 1, val) != 0)
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return 1;
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}
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/*
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* Enable PWM Lookup-Table, PWM Clock 360 kHz, Tachometer Mode 2
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*/
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val = 0x02;
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if (dtt_write(sensor, DTT_FAN_CONFIG, val) != 0)
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return 1;
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/*
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* Enable Tach input
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*/
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val = dtt_read(sensor, DTT_CONFIG) | 0x04;
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if (dtt_write(sensor, DTT_CONFIG, val) != 0)
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return 1;
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return 0;
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}
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int dtt_get_temp(int sensor)
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{
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s16 temp = (dtt_read(sensor, DTT_READ_TEMP_RMT_MSB) << 8)
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| (dtt_read(sensor, DTT_READ_TEMP_RMT_LSB));
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if (is_lm64(sensor))
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temp += 16 << 8;
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/* Ignore LSB for now, U-Boot only prints natural numbers */
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return temp >> 8;
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}
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