New Port: Eros Q Native

What works:
- LCD: 16-bit RGB565
- all buttons, including scrollwheel
- SD Card
- Battery level and charging/not charging status
- USB
- audio
- sample rate switching
- HP / LO detect, with "safe" fixed LO volume -
   LO volume will only be put to user-defined max volume
   if headphones are not present.
- rtc
- Plugins build, tried a couple and they seem OK
- Bootloader, installable to nand via usbboot

What doesn't work:
- Dual Boot
- power on/off has intermittent, low volume audio click
   (sometimes it's completely silent, sometimes there's
    a click)
- Audio uses 16-bit volume scaling, so clicking/popping
   is pretty bad at lower volumes - need 32 bit volume
   scaling, 24 bit I2S data
- USB HID keys not yet defined
- no jztool support

Unknowns:
- Stereo Switch pins: Direction select, AC_DC
   (probably not even hooked up)
- What is the actual purpose of the Stereo Swtich?
- How does the bluetooth module connect?

"Someday" stuff:
- get LCD working at higher bit depth
- Bluetooth

Change-Id: I70dda8fc092c6e3f4352f2245e4164193f803c33

1 files changed, 90 insertions, 0 deletions

diff --git a/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c b/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c
new file mode 100644
index 0000000000..7bb985650c
--- /dev/null
+++ b/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c
@@ -0,0 +1,90 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2021 Aidan MacDonald, Dana Conrad
+ *
+ * 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 "audiohw.h"
+#include "system.h"
+#include "pcm_sampr.h"
+#include "aic-x1000.h"
+#include "i2c-x1000.h"
+#include "gpio-x1000.h"
+#include "logf.h"
+
+/* Audio path appears to be:
+ * DAC --> HP Amp --> Stereo Switch --> HP OUT
+ *     \--> LO OUT
+ *
+ * The real purpose of the Stereo Switch is not clear.
+ * It appears to switch sources between the HP amp and something,
+ * likely something unimplemented. */
+
+void audiohw_init(void)
+{
+    /* explicitly mute everything */
+    gpio_set_level(GPIO_MAX97220_SHDN, 0);
+    gpio_set_level(GPIO_ISL54405_MUTE, 1);
+    gpio_set_level(GPIO_PCM5102A_XMIT, 0);
+
+    aic_set_external_codec(true);
+    aic_set_i2s_mode(AIC_I2S_MASTER_MODE);
+    audiohw_set_frequency(HW_FREQ_48);
+
+    aic_enable_i2s_master_clock(true);
+    aic_enable_i2s_bit_clock(true);
+
+    mdelay(10);
+
+    /* power on DAC and HP Amp */
+    gpio_set_level(GPIO_PCM5102A_ANALOG_PWR, 1);
+    gpio_set_level(GPIO_MAX97220_POWER, 1);
+}
+
+void audiohw_postinit(void)
+{
+    /* unmute - attempt to make power-on pop-free */
+    gpio_set_level(GPIO_ISL54405_SEL, 0);
+    gpio_set_level(GPIO_MAX97220_SHDN, 1);
+    mdelay(10);
+    gpio_set_level(GPIO_PCM5102A_XMIT, 1);
+    mdelay(10);
+    gpio_set_level(GPIO_ISL54405_MUTE, 0);
+}
+
+/* TODO: get shutdown just right according to dac datasheet */
+void audiohw_close(void)
+{
+    /* mute - attempt to make power-off pop-free */
+    gpio_set_level(GPIO_ISL54405_MUTE, 1);
+    mdelay(10);
+    gpio_set_level(GPIO_PCM5102A_XMIT, 0);
+    mdelay(10);
+    gpio_set_level(GPIO_MAX97220_SHDN, 0);
+}
+
+void audiohw_set_frequency(int fsel)
+{
+    int sampr = hw_freq_sampr[fsel];
+    int mult = 256;
+
+    aic_enable_i2s_bit_clock(false);
+    aic_set_i2s_clock(X1000_CLK_SCLK_A, sampr, mult);
+    aic_enable_i2s_bit_clock(true);
+}
+