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authorAmaury Pouly <pamaury@rockbox.org>2011-09-13 23:40:09 +0000
committerAmaury Pouly <pamaury@rockbox.org>2011-09-13 23:40:09 +0000
commit696b9d146b69b36fc309233f62d43f4f57f26823 (patch)
tree1bd143562b773bedd4ce29314b066f746e0527fb /firmware/target/arm/imx233/lradc-imx233.c
parent45537a4e87c8696629cbda8efcd721b74f084ff1 (diff)
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imx233/fuze+: implement lradc function and adc on top of it
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30534 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm/imx233/lradc-imx233.c')
-rw-r--r--firmware/target/arm/imx233/lradc-imx233.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/firmware/target/arm/imx233/lradc-imx233.c b/firmware/target/arm/imx233/lradc-imx233.c
new file mode 100644
index 0000000000..7da58c64b3
--- /dev/null
+++ b/firmware/target/arm/imx233/lradc-imx233.c
@@ -0,0 +1,146 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2011 by Amaury Pouly
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "system.h"
+#include "system-target.h"
+#include "lradc-imx233.h"
+
+static struct semaphore free_bm_sema;
+static struct mutex free_bm_mutex;
+static unsigned free_bm;
+
+void imx233_lradc_setup_channel(int channel, bool div2, bool acc, int nr_samples, int src)
+{
+ __REG_CLR(HW_LRADC_CHx(channel)) =HW_LRADC_CHx__NUM_SAMPLES_BM | HW_LRADC_CHx__ACCUMULATE;
+ __REG_SET(HW_LRADC_CHx(channel)) = nr_samples << HW_LRADC_CHx__NUM_SAMPLES_BP |
+ acc << HW_LRADC_CHx__ACCUMULATE;
+ if(div2)
+ __REG_SET(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__DIVIDE_BY_TWO(channel);
+ else
+ __REG_CLR(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__DIVIDE_BY_TWO(channel);
+ __REG_CLR(HW_LRADC_CTRL4) = HW_LRADC_CTRL4__LRADCxSELECT_BM(channel);
+ __REG_SET(HW_LRADC_CTRL4) = src << HW_LRADC_CTRL4__LRADCxSELECT_BP(channel);
+}
+
+void imx233_lradc_setup_delay(int dchan, int trigger_lradc, int trigger_delays,
+ int loop_count, int delay)
+{
+ HW_LRADC_DELAYx(dchan) =
+ trigger_lradc << HW_LRADC_DELAYx__TRIGGER_LRADCS_BP |
+ trigger_delays << HW_LRADC_DELAYx__TRIGGER_DELAYS_BP |
+ loop_count << HW_LRADC_DELAYx__LOOP_COUNT_BP |
+ delay << HW_LRADC_DELAYx__DELAY_BP;
+}
+
+void imx233_lradc_kick_channel(int channel)
+{
+ __REG_CLR(HW_LRADC_CTRL1) = HW_LRADC_CTRL1__LRADCx_IRQ(channel);
+ __REG_SET(HW_LRADC_CTRL0) = HW_LRADC_CTRL0__SCHEDULE(channel);
+}
+
+void imx233_lradc_kick_delay(int dchan)
+{
+ __REG_SET(HW_LRADC_DELAYx(dchan)) = HW_LRADC_DELAYx__KICK;
+}
+
+void imx233_lradc_wait_channel(int channel)
+{
+ /* wait for completion */
+ while(!(HW_LRADC_CTRL1 & HW_LRADC_CTRL1__LRADCx_IRQ(channel)))
+ yield();
+}
+
+int imx233_lradc_read_channel(int channel)
+{
+ return __XTRACT_EX(HW_LRADC_CHx(channel), HW_LRADC_CHx__VALUE);
+}
+
+void imx233_lradc_clear_channel(int channel)
+{
+ __REG_CLR(HW_LRADC_CHx(channel)) = HW_LRADC_CHx__VALUE_BM;
+}
+
+int imx233_lradc_acquire_channel(int timeout)
+{
+ int w = semaphore_wait(&free_bm_sema, timeout);
+ if(w == OBJ_WAIT_TIMEDOUT)
+ return w;
+ mutex_lock(&free_bm_mutex);
+ int chan = find_first_set_bit(free_bm);
+ if(chan >= HW_LRADC_NUM_CHANNELS)
+ panicf("imx233_lradc_acquire_channel cannot find a free channel !");
+ free_bm &= ~(1 << chan);
+ mutex_unlock(&free_bm_mutex);
+ return chan;
+}
+
+void imx233_lradc_release_channel(int chan)
+{
+ mutex_lock(&free_bm_mutex);
+ free_bm |= 1 << chan;
+ mutex_unlock(&free_bm_mutex);
+ semaphore_release(&free_bm_sema);
+}
+
+void imx233_lradc_reserve_channel(int channel)
+{
+ semaphore_wait(&free_bm_sema, TIMEOUT_NOBLOCK);
+ mutex_lock(&free_bm_mutex);
+ free_bm &= ~(1 << channel);
+ mutex_unlock(&free_bm_mutex);
+}
+
+int imx233_lradc_sense_die_temperature(int nmos_chan, int pmos_chan)
+{
+ // mux sensors
+ __REG_CLR(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMPSENSE_PWD;
+ imx233_lradc_clear_channel(nmos_chan);
+ imx233_lradc_clear_channel(pmos_chan);
+ // schedule both channels
+ imx233_lradc_kick_channel(nmos_chan);
+ imx233_lradc_kick_channel(pmos_chan);
+ // wait completion
+ imx233_lradc_wait_channel(nmos_chan);
+ imx233_lradc_wait_channel(pmos_chan);
+ // mux sensors
+ __REG_SET(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMPSENSE_PWD;
+ // do the computation
+ int diff = imx233_lradc_read_channel(nmos_chan) - imx233_lradc_read_channel(pmos_chan);
+ // return diff * 1.012 / 4
+ return (diff * 1012) / 4000;
+}
+
+void imx233_lradc_init(void)
+{
+ mutex_init(&free_bm_mutex);
+ semaphore_init(&free_bm_sema, HW_LRADC_NUM_CHANNELS, HW_LRADC_NUM_CHANNELS);
+ free_bm = (1 << HW_LRADC_NUM_CHANNELS) - 1;
+ // enable block
+ imx233_reset_block(&HW_LRADC_CTRL0);
+ // disable ground ref
+ __REG_CLR(HW_LRADC_CTRL0) = HW_LRADC_CTRL0__ONCHIP_GROUNDREF;
+ // disable temperature sensors
+ __REG_CLR(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMP_SENSOR_IENABLE0 |
+ HW_LRADC_CTRL2__TEMP_SENSOR_IENABLE1;
+ __REG_SET(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMPSENSE_PWD;
+ // set frequency
+ __REG_CLR(HW_LRADC_CTRL3) = HW_LRADC_CTRL3__CYCLE_TIME_BM;
+ __REG_SET(HW_LRADC_CTRL3) = HW_LRADC_CTRL3__CYCLE_TIME__6MHz;
+}