iPod - Initial skeleton of an audio driver

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8248 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 249 insertions, 0 deletions

diff --git a/firmware/drivers/wm8975.c b/firmware/drivers/wm8975.c
new file mode 100644
index 0000000000..0931d493fb
--- /dev/null
+++ b/firmware/drivers/wm8975.c
@@ -0,0 +1,249 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 by Dave Chapman
+ *
+ * Based on code from the iPodLinux project (C) 2003-2005 Bernard Leach
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "lcd.h"
+#include "cpu.h"
+#include "kernel.h"
+#include "thread.h"
+#include "power.h"
+#include "debug.h"
+#include "system.h"
+#include "sprintf.h"
+#include "button.h"
+#include "string.h"
+#include "file.h"
+#include "buffer.h"
+#include "audio.h"
+
+#include "i2c-pp5020.h"
+#include "wm8975.h"
+#include "pcf50605.h"
+
+void wm8975_reset(void);
+
+#define IPOD_PCM_LEVEL 0x65       /* -6dB */
+
+#define RESET     (0x0f<<1)
+#define PWRMGMT1  (0x19<<1)
+#define PWRMGMT2  (0x1a<<1)
+#define AINTFCE   (0x07<<1)
+#define LOUT1VOL  (0x02<<1)
+#define ROUT1VOL  (0x03<<1)
+#define LOUT2VOL  (0x28<<1)
+#define ROUT2VOL  (0x29<<1)
+
+
+/*
+ * Reset the I2S BIT.FORMAT I2S, 16bit, FIFO.FORMAT 32bit
+ */
+static void i2s_reset(void)
+{
+    /* PP502x */
+
+    /* I2S soft reset */
+    outl(inl(0x70002800) | 0x80000000, 0x70002800);
+    outl(inl(0x70002800) & ~0x80000000, 0x70002800);
+
+    /* BIT.FORMAT [11:10] = I2S (default) */
+    outl(inl(0x70002800) & ~0xc00, 0x70002800);
+    /* BIT.SIZE [9:8] = 16bit (default) */
+    outl(inl(0x70002800) & ~0x300, 0x70002800);
+
+    /* FIFO.FORMAT [6:4] = 32 bit LSB */
+    /* since BIT.SIZ < FIFO.FORMAT low 16 bits will be 0 */
+    outl(inl(0x70002800) | 0x30, 0x70002800);
+
+    /* RX_ATN_LVL=1 == when 12 slots full */
+    /* TX_ATN_LVL=1 == when 12 slots empty */
+    outl(inl(0x7000280c) | 0x33, 0x7000280c);
+
+    /* Rx.CLR = 1, TX.CLR = 1 */
+    outl(inl(0x7000280c) | 0x1100, 0x7000280c);
+}
+
+/*
+ * Initialise the WM8975 for playback via headphone and line out.
+ * Note, I'm using the WM8750 datasheet as its apparently close.
+ */
+int wm8975_init(void) {
+    /* reset I2C */
+    i2c_init();
+
+    /* normal outputs for CDI and I2S pin groups */
+    outl(inl(0x70000020) & ~0x300, 0x70000020);
+
+    /*mini2?*/
+    outl(inl(0x70000010) & ~0x3000000, 0x70000010);
+    /*mini2?*/
+
+    /* device reset */
+    outl(inl(0x60006004) | 0x800, 0x60006004);
+    outl(inl(0x60006004) & ~0x800, 0x60006004);
+
+    /* device enable */
+    outl(inl(0x6000600C) | 0x807, 0x6000600C);
+
+    /* enable external dev clock clocks */
+    outl(inl(0x6000600c) | 0x2, 0x6000600c);
+
+    /* external dev clock to 24MHz */
+    outl(inl(0x70000018) & ~0xc, 0x70000018);
+}
+
+/* Silently enable / disable audio output */
+void wm8975_enable_output(bool enable)
+{
+    if (enable) 
+    {
+        /* reset the I2S controller into known state */
+        i2s_reset();
+
+        /*
+         * 1. Switch on power supplies.
+         *    By default the WM8750L is in Standby Mode, the DAC is
+         *    digitally muted and the Audio Interface, Line outputs
+         *    and Headphone outputs are all OFF (DACMU = 1 Power
+         *    Management registers 1 and 2 are all zeros).
+         */
+        ipod_i2c_send(0x1a, RESET | 1, 0xff);    /*Reset*/
+        ipod_i2c_send(0x1a, RESET, 0x0);
+    
+         /* 2. Enable Vmid and VREF. */
+        ipod_i2c_send(0x1a, PWRMGMT1, 0xc0);    /*Pwr Mgmt(1)*/
+    
+         /* 3. Enable DACs as required. */
+        ipod_i2c_send(0x1a, PWRMGMT2 | 0x1, 0x80);    /*Pwr Mgmt(2)*/
+    
+         /* 4. Enable line and / or headphone output buffers as required. */
+        ipod_i2c_send(0x1a, PWRMGMT2 | 0x1, 0xf8);    /*Pwr Mgmt(2)*/
+    
+        /* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
+        /* IWL=00(16 bit) FORMAT=10(I2S format) */
+        ipod_i2c_send(0x1a, AINTFCE, 0x42);
+    
+        /* The iPod can handle multiple frequencies, but fix at 44.1KHz for now */
+        wm8975_set_sample_rate(WM8975_44100HZ);
+    
+        /* set the volume to -6dB */
+        ipod_i2c_send(0x1a, LOUT1VOL, IPOD_PCM_LEVEL);
+        ipod_i2c_send(0x1a, ROUT1VOL | 0x1, IPOD_PCM_LEVEL);
+        ipod_i2c_send(0x1a, LOUT1VOL, IPOD_PCM_LEVEL);
+        ipod_i2c_send(0x1a, ROUT1VOL | 0x1, IPOD_PCM_LEVEL);
+    
+        ipod_i2c_send(0x1a, 0x45, 0x50);    /* Left out Mix(def) */
+        ipod_i2c_send(0x1a, 0x46, 0x50);
+    
+        ipod_i2c_send(0x1a, 0x48, 0x50);    /* Right out Mix(def) */
+        ipod_i2c_send(0x1a, 0x4b, 0x50);
+    
+        ipod_i2c_send(0x1a, 0x4c, 0x0);     /* Mono out Mix */
+        ipod_i2c_send(0x1a, 0x4e, 0x0);
+
+        wm8975_mute(0);
+    } else {
+        wm8975_mute(1);
+    }
+}
+
+int wm8975_set_master_vol(int vol_l, int vol_r)
+{
+    /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
+    /* 1111111 == +6dB */
+    /* 1111001 == 0dB */
+    /* 0110000 == -73dB */
+    /* 0101111 == mute (0x2f) */
+
+    /* OUT1 */
+    ipod_i2c_send(0x1a, LOUT1VOL, vol_l);
+    ipod_i2c_send(0x1a, ROUT1VOL | 0x1, vol_r);
+
+    /* OUT2 */
+    ipod_i2c_send(0x1a, LOUT2VOL, vol_l);
+    ipod_i2c_send(0x1a, ROUT2VOL | 0x1, vol_r);
+}
+
+int wm8975_set_mixer_vol(int channel1, int channel2)
+{
+
+}
+
+void wm8975_set_bass(int value)
+{
+
+}
+
+void wm8975_set_treble(int value)
+{
+
+}
+
+int wm8975_mute(int mute)
+{
+    if (mute)
+    {
+        /* Set DACMU = 1 to soft-mute the audio DACs. */
+        ipod_i2c_send(0x1a, 0xa, 0x8);
+    } else {
+        /* Set DACMU = 0 to soft-un-mute the audio DACs. */
+        ipod_i2c_send(0x1a, 0xa, 0x0);
+    }
+}
+
+/* Nice shutdown of WM8975 codec */
+void wm8975_close(void)
+{
+    /* 1. Set DACMU = 1 to soft-mute the audio DACs. */
+    ipod_i2c_send(0x1a, 0xa, 0x8);
+
+    /* 2. Disable all output buffers. */
+    ipod_i2c_send(0x1a, 0x34, 0x0);     /*Pwr Mgmt(2)*/
+
+    /* 3. Switch off the power supplies. */
+    ipod_i2c_send(0x1a, 0x32, 0x0);     /*Pwr Mgmt(1)*/
+}
+
+/* Change the order of the noise shaper, 5th order is recommended above 32kHz */
+void wm8975_set_nsorder(int order)
+{
+
+}
+
+/* Note: Disable output before calling this function */
+void wm8975_set_sample_rate(int sampling_control) {
+
+  ipod_i2c_send(0x1a, 0x10, sampling_control);
+
+}
+
+void wm8975_enable_recording(bool source_mic) {
+
+}
+
+void wm8975_disable_recording(void) {
+
+}
+
+void wm8975_set_recvol(int left, int right, int type) {
+
+}
+
+void wm8975_set_monitor(int enable) {
+
+}