/* * (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 Temperature Sensor */ #include <common.h> #include <i2c.h> #include <dtt.h> #define DTT_I2C_DEV_CODE 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. */ sensor = DTT_I2C_DEV_CODE; /* address of lm63 is not adjustable */ 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. */ sensor = DTT_I2C_DEV_CODE; /* address of lm63 is not adjustable */ 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 _dtt_init(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; /* * 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 (dtt_write(sensor, address, val) != 0) return 1; 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)); /* Ignore LSB for now, U-Boot only prints natural numbers */ return temp >> 8; } int dtt_init(void) { int i; unsigned char sensors[] = CONFIG_DTT_SENSORS; const char *const header = "DTT: "; for (i = 0; i < sizeof(sensors); i++) { if (_dtt_init(sensors[i]) != 0) printf("%s%d FAILED INIT\n", header, i + 1); else printf("%s%d is %i C\n", header, i + 1, dtt_get_temp(sensors[i])); } return 0; }