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>
180 lines
4.4 KiB
C
180 lines
4.4 KiB
C
/*
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* (C) Copyright 2003
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* Murray Jensen, CSIRO-MIT, Murray.Jensen@csiro.au
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*
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* based on dtt/lm75.c which is ...
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*
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* (C) Copyright 2001
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* Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
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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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* Analog Devices's ADM1021
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* "Low Cost Microprocessor System Temperature Monitor"
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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_READ_LOC_VALUE 0x00
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#define DTT_READ_REM_VALUE 0x01
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#define DTT_READ_STATUS 0x02
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#define DTT_READ_CONFIG 0x03
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#define DTT_READ_CONVRATE 0x04
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#define DTT_READ_LOC_HIGHLIM 0x05
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#define DTT_READ_LOC_LOWLIM 0x06
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#define DTT_READ_REM_HIGHLIM 0x07
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#define DTT_READ_REM_LOWLIM 0x08
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#define DTT_READ_DEVID 0xfe
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#define DTT_WRITE_CONFIG 0x09
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#define DTT_WRITE_CONVRATE 0x0a
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#define DTT_WRITE_LOC_HIGHLIM 0x0b
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#define DTT_WRITE_LOC_LOWLIM 0x0c
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#define DTT_WRITE_REM_HIGHLIM 0x0d
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#define DTT_WRITE_REM_LOWLIM 0x0e
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#define DTT_WRITE_ONESHOT 0x0f
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#define DTT_STATUS_BUSY 0x80 /* 1=ADC Converting */
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#define DTT_STATUS_LHIGH 0x40 /* 1=Local High Temp Limit Tripped */
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#define DTT_STATUS_LLOW 0x20 /* 1=Local Low Temp Limit Tripped */
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#define DTT_STATUS_RHIGH 0x10 /* 1=Remote High Temp Limit Tripped */
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#define DTT_STATUS_RLOW 0x08 /* 1=Remote Low Temp Limit Tripped */
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#define DTT_STATUS_OPEN 0x04 /* 1=Remote Sensor Open-Circuit */
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#define DTT_CONFIG_ALERT_MASKED 0x80 /* 0=ALERT Enabled, 1=ALERT Masked */
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#define DTT_CONFIG_STANDBY 0x40 /* 0=Run, 1=Standby */
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#define DTT_ADM1021_DEVID 0x41
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typedef
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struct {
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uint i2c_addr:7; /* 7bit i2c chip address */
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uint conv_rate:3; /* conversion rate */
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uint enable_alert:1; /* enable alert output pin */
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uint enable_local:1; /* enable internal temp sensor */
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uint max_local:8; /* internal temp maximum */
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uint min_local:8; /* internal temp minimum */
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uint enable_remote:1; /* enable remote temp sensor */
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uint max_remote:8; /* remote temp maximum */
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uint min_remote:8; /* remote temp minimum */
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}
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dtt_cfg_t;
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dtt_cfg_t dttcfg[] = CONFIG_SYS_DTT_ADM1021;
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int
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dtt_read (int sensor, int reg)
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{
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dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
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uchar data;
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if (i2c_read(dcp->i2c_addr, reg, 1, &data, 1) != 0)
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return -1;
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return (int)data;
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} /* dtt_read() */
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int
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dtt_write (int sensor, int reg, int val)
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{
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dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
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uchar data;
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data = (uchar)(val & 0xff);
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if (i2c_write(dcp->i2c_addr, reg, 1, &data, 1) != 0)
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return 1;
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return 0;
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} /* dtt_write() */
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int
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dtt_init_one(int sensor)
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{
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dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
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int reg, val;
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if (((sensor & 1) == 0 ? dcp->enable_local : dcp->enable_remote) == 0)
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return 1; /* sensor is disabled (or rather ignored) */
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/*
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* Setup High Limit register
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*/
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if ((sensor & 1) == 0) {
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reg = DTT_WRITE_LOC_HIGHLIM;
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val = dcp->max_local;
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}
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else {
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reg = DTT_WRITE_REM_HIGHLIM;
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val = dcp->max_remote;
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}
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if (dtt_write (sensor, reg, val) != 0)
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return 1;
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/*
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* Setup Low Limit register
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*/
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if ((sensor & 1) == 0) {
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reg = DTT_WRITE_LOC_LOWLIM;
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val = dcp->min_local;
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}
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else {
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reg = DTT_WRITE_REM_LOWLIM;
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val = dcp->min_remote;
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}
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if (dtt_write (sensor, reg, val) != 0)
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return 1;
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/* shouldn't hurt if the rest gets done twice */
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/*
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* Setup Conversion Rate register
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*/
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if (dtt_write (sensor, DTT_WRITE_CONVRATE, dcp->conv_rate) != 0)
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return 1;
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/*
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* Setup configuraton register
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*/
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val = 0; /* running */
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if (dcp->enable_alert == 0)
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val |= DTT_CONFIG_ALERT_MASKED; /* mask ALERT pin */
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if (dtt_write (sensor, DTT_WRITE_CONFIG, val) != 0)
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return 1;
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return 0;
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} /* dtt_init_one() */
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int
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dtt_get_temp (int sensor)
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{
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signed char val;
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if ((sensor & 1) == 0)
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val = dtt_read(sensor, DTT_READ_LOC_VALUE);
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else
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val = dtt_read(sensor, DTT_READ_REM_VALUE);
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return (int) val;
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} /* dtt_get_temp() */
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