e5b5041583
Rework code to be more useful: - move battery channel init to lradc - always init lradc from system (previously from adc) - don't reserve channels for vddio, nmos or pmos - implement external temperature sensing using current source - use this for battery sensing on the Fuze+ (calibration needed) Change-Id: I5f9a24b9243db7d1e6bdb16b84bc891e61d0c318
237 lines
8.2 KiB
C
237 lines
8.2 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2011 by Amaury Pouly
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "system.h"
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#include "system-target.h"
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#include "lradc-imx233.h"
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#include "kernel-imx233.h"
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/* channels */
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static struct channel_arbiter_t channel_arbiter;
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/* delay channels */
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static struct channel_arbiter_t delay_arbiter;
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/* battery is very special, dedicate a channel and a delay to it */
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static int battery_chan;
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static int battery_delay_chan;
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void imx233_lradc_setup_channel(int channel, bool div2, bool acc, int nr_samples, int src)
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{
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__REG_CLR(HW_LRADC_CHx(channel)) = HW_LRADC_CHx__NUM_SAMPLES_BM | HW_LRADC_CHx__ACCUMULATE;
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__REG_SET(HW_LRADC_CHx(channel)) = nr_samples << HW_LRADC_CHx__NUM_SAMPLES_BP |
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acc << HW_LRADC_CHx__ACCUMULATE;
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if(div2)
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__REG_SET(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__DIVIDE_BY_TWO(channel);
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else
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__REG_CLR(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__DIVIDE_BY_TWO(channel);
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__REG_CLR(HW_LRADC_CTRL4) = HW_LRADC_CTRL4__LRADCxSELECT_BM(channel);
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__REG_SET(HW_LRADC_CTRL4) = src << HW_LRADC_CTRL4__LRADCxSELECT_BP(channel);
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}
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void imx233_lradc_setup_delay(int dchan, int trigger_lradc, int trigger_delays,
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int loop_count, int delay)
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{
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HW_LRADC_DELAYx(dchan) =
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trigger_lradc << HW_LRADC_DELAYx__TRIGGER_LRADCS_BP |
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trigger_delays << HW_LRADC_DELAYx__TRIGGER_DELAYS_BP |
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loop_count << HW_LRADC_DELAYx__LOOP_COUNT_BP |
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delay << HW_LRADC_DELAYx__DELAY_BP;
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}
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void imx233_lradc_kick_channel(int channel)
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{
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__REG_CLR(HW_LRADC_CTRL1) = HW_LRADC_CTRL1__LRADCx_IRQ(channel);
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__REG_SET(HW_LRADC_CTRL0) = HW_LRADC_CTRL0__SCHEDULE(channel);
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}
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void imx233_lradc_kick_delay(int dchan)
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{
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__REG_SET(HW_LRADC_DELAYx(dchan)) = HW_LRADC_DELAYx__KICK;
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}
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void imx233_lradc_wait_channel(int channel)
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{
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/* wait for completion */
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while(!(HW_LRADC_CTRL1 & HW_LRADC_CTRL1__LRADCx_IRQ(channel)))
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yield();
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}
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int imx233_lradc_read_channel(int channel)
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{
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return __XTRACT_EX(HW_LRADC_CHx(channel), HW_LRADC_CHx__VALUE);
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}
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void imx233_lradc_clear_channel(int channel)
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{
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__REG_CLR(HW_LRADC_CHx(channel)) = HW_LRADC_CHx__VALUE_BM;
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}
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int imx233_lradc_acquire_channel(int timeout)
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{
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return arbiter_acquire(&channel_arbiter, timeout);
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}
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void imx233_lradc_release_channel(int chan)
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{
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return arbiter_release(&channel_arbiter, chan);
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}
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void imx233_lradc_reserve_channel(int channel)
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{
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return arbiter_reserve(&channel_arbiter, channel);
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}
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int imx233_lradc_acquire_delay(int timeout)
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{
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return arbiter_acquire(&delay_arbiter, timeout);
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}
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void imx233_lradc_release_delay(int chan)
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{
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return arbiter_release(&delay_arbiter, chan);
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}
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void imx233_lradc_reserve_delay(int channel)
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{
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return arbiter_reserve(&delay_arbiter, channel);
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}
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int imx233_lradc_sense_die_temperature(int nmos_chan, int pmos_chan)
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{
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imx233_lradc_setup_channel(nmos_chan, false, false, 0, HW_LRADC_CHANNEL_NMOS_THIN);
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imx233_lradc_setup_channel(pmos_chan, false, false, 0, HW_LRADC_CHANNEL_PMOS_THIN);
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// mux sensors
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__REG_CLR(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMPSENSE_PWD;
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imx233_lradc_clear_channel(nmos_chan);
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imx233_lradc_clear_channel(pmos_chan);
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// schedule both channels
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imx233_lradc_kick_channel(nmos_chan);
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imx233_lradc_kick_channel(pmos_chan);
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// wait completion
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imx233_lradc_wait_channel(nmos_chan);
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imx233_lradc_wait_channel(pmos_chan);
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// mux sensors
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__REG_SET(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMPSENSE_PWD;
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// do the computation
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int diff = imx233_lradc_read_channel(nmos_chan) - imx233_lradc_read_channel(pmos_chan);
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// return diff * 1.012 / 4
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return (diff * 1012) / 4000;
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}
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/* set to 0 to disable current source */
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static void imx233_lradc_set_temp_isrc(int sensor, int value)
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{
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if(sensor < 0 || sensor > 1)
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panicf("imx233_lradc_set_temp_isrc: invalid sensor");
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unsigned mask = HW_LRADC_CTRL2__TEMP_ISRCx_BM(sensor);
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unsigned bp = HW_LRADC_CTRL2__TEMP_ISRCx_BP(sensor);
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unsigned en = HW_LRADC_CTRL2__TEMP_SENSOR_IENABLEx(sensor);
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__REG_CLR(HW_LRADC_CTRL2) = mask;
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__REG_SET(HW_LRADC_CTRL2) = value << bp;
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if(value != 0)
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{
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__REG_SET(HW_LRADC_CTRL2) = en;
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udelay(100);
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}
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else
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__REG_CLR(HW_LRADC_CTRL2) = en;
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}
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int imx233_lradc_sense_ext_temperature(int chan, int sensor)
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{
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#define EXT_TEMP_ACC_COUNT 5
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/* setup channel */
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imx233_lradc_setup_channel(chan, false, false, 0, sensor);
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/* set current source to 300µA */
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imx233_lradc_set_temp_isrc(sensor, HW_LRADC_CTRL2__TEMP_ISRC__300uA);
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/* read value and accumulate */
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int a = 0;
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for(int i = 0; i < EXT_TEMP_ACC_COUNT; i++)
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{
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imx233_lradc_clear_channel(chan);
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imx233_lradc_kick_channel(chan);
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imx233_lradc_wait_channel(chan);
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a += imx233_lradc_read_channel(chan);
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}
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/* setup channel for small accumulation */
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/* set current source to 20µA */
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imx233_lradc_set_temp_isrc(sensor, HW_LRADC_CTRL2__TEMP_ISRC__20uA);
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/* read value */
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int b = 0;
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for(int i = 0; i < EXT_TEMP_ACC_COUNT; i++)
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{
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imx233_lradc_clear_channel(chan);
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imx233_lradc_kick_channel(chan);
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imx233_lradc_wait_channel(chan);
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b += imx233_lradc_read_channel(chan);
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}
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/* disable sensor current */
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imx233_lradc_set_temp_isrc(sensor, HW_LRADC_CTRL2__TEMP_ISRC__0uA);
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return (b - a) / EXT_TEMP_ACC_COUNT;
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}
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void imx233_lradc_setup_battery_conversion(bool automatic, unsigned long scale_factor)
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{
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__REG_CLR(HW_LRADC_CONVERSION) = HW_LRADC_CONVERSION__SCALE_FACTOR_BM;
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__REG_SET(HW_LRADC_CONVERSION) = scale_factor;
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if(automatic)
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__REG_SET(HW_LRADC_CONVERSION) = HW_LRADC_CONVERSION__AUTOMATIC;
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else
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__REG_CLR(HW_LRADC_CONVERSION) = HW_LRADC_CONVERSION__AUTOMATIC;
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}
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int imx233_lradc_read_battery_voltage(void)
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{
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return __XTRACT(HW_LRADC_CONVERSION, SCALED_BATT_VOLTAGE);
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}
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void imx233_lradc_init(void)
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{
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arbiter_init(&channel_arbiter, HW_LRADC_NUM_CHANNELS);
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arbiter_init(&delay_arbiter, HW_LRADC_NUM_DELAYS);
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// enable block
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imx233_reset_block(&HW_LRADC_CTRL0);
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// disable ground ref
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__REG_CLR(HW_LRADC_CTRL0) = HW_LRADC_CTRL0__ONCHIP_GROUNDREF;
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// disable temperature sensors
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__REG_CLR(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMP_SENSOR_IENABLE0 |
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HW_LRADC_CTRL2__TEMP_SENSOR_IENABLE1;
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__REG_SET(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMPSENSE_PWD;
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// set frequency
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__REG_CLR(HW_LRADC_CTRL3) = HW_LRADC_CTRL3__CYCLE_TIME_BM;
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__REG_SET(HW_LRADC_CTRL3) = HW_LRADC_CTRL3__CYCLE_TIME__6MHz;
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// setup battery
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battery_chan = 7;
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imx233_lradc_reserve_channel(battery_chan);
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/* setup them for the simplest use: no accumulation, no division*/
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imx233_lradc_setup_channel(battery_chan, false, false, 0, HW_LRADC_CHANNEL_BATTERY);
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/* setup delay channel for battery for automatic reading and scaling */
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battery_delay_chan = 0;
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imx233_lradc_reserve_delay(battery_delay_chan);
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/* setup delay to trigger battery channel and retrigger itself.
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* The counter runs at 2KHz so a delay of 200 will trigger 10
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* conversions per seconds */
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imx233_lradc_setup_delay(battery_delay_chan, 1 << battery_chan,
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1 << battery_delay_chan, 0, 200);
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imx233_lradc_kick_delay(battery_delay_chan);
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/* enable automatic conversion, use Li-Ion type battery */
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imx233_lradc_setup_battery_conversion(true, HW_LRADC_CONVERSION__SCALE_FACTOR__LI_ION);
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}
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