ipod Classic: implement HAVE_RECORDING

This patch has been tested on iPod 80 and 160slim, actually
it works but some updates must be done to the final version:

 - unlimitted input buffer
 - decrease CHUNK_SIZE
 - use non-cached addresses instead of discard d-cache ???

Capture hardware versions:

 Ver  iPod models   capture support
 ---  -----------   ---------------
 0    80/160fat     dock line-in
 1    120/160slim   dock line-in + jack mic

 HW version 1 includes an amplifier for the jack plug mic.

 Capture HW detection only tested on iPod 80 and 160slim.

CODEC power:

 AFAIK, OF powers CS42L55 at VA=2.4V for capture (1.8V for
 playback) and turns on the ADC charge pump. CODEC datasheet
 recommmends to disable the charge pump for VA>2.1V.

 CS42L55 DS, s4.13 (Required Initialization Settings): for
 VA>2.1V, some adjustments "must" be done using undocummented
 "control port compensation" registers. OF does not modifies
 these registers when VA=2.4V.

 This patch configures capture HW in the same way as OF does.

TODO:
 - ADC full scale voltage depends on VA, perform tests to find
   clipping levels for VA=1.8V and VA=2.4V

Change-Id: I7e20fd3ecaa83b1c58d5c746f5153fe5c3891d75

1 files changed, 32 insertions, 0 deletions

diff --git a/firmware/target/arm/s5l8702/ipod6g/audio-ipod6g.c b/firmware/target/arm/s5l8702/ipod6g/audio-ipod6g.c
index 6ede3d0c30..6a3bab06d6 100644
--- a/firmware/target/arm/s5l8702/ipod6g/audio-ipod6g.c
+++ b/firmware/target/arm/s5l8702/ipod6g/audio-ipod6g.c
@@ -22,6 +22,9 @@
 #include "cpu.h"
 #include "audio.h"
 #include "sound.h"
+#include "pmu-target.h"
+
+extern int rec_hw_ver;
 
 #if INPUT_SRC_CAPS != 0
 void audio_set_output_source(int source)
@@ -46,13 +49,42 @@ void audio_input_mux(int source, unsigned flags)
             {
                 audiohw_set_monitor(false);
                 audiohw_disable_recording();
+
+                /* Vcodec = 1800mV (900mV + value*100mV) */
+                pmu_ldo_set_voltage(3, 0x9);
+
+                if (rec_hw_ver == 1)
+                    GPIOCMD = 0xe070e;
             }
 #endif
         break;
+
+#ifdef HAVE_MIC_REC
+        case AUDIO_SRC_MIC:             /* recording only */
+            if (source != last_source)
+            {
+                if (rec_hw_ver == 1)
+                    GPIOCMD = 0xe070f;
+
+                /* Vcodec = 2400mV (900mV + value*100mV) */
+                pmu_ldo_set_voltage(3, 0xf);
+
+                audiohw_set_monitor(false);
+                audiohw_enable_recording(true);  /* source mic */
+            }
+        break;
+#endif
+
 #ifdef HAVE_LINE_REC
         case AUDIO_SRC_LINEIN:          /* recording only */
             if (source != last_source)
             {
+                if (rec_hw_ver == 1)
+                    GPIOCMD = 0xe070e;
+
+                /* Vcodec = 2400mV (900mV + value*100mV) */
+                pmu_ldo_set_voltage(3, 0xf);
+
                 audiohw_set_monitor(false);
                 audiohw_enable_recording(false); /* source line */
             }