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This driver emulates the ARM AACI interface (PL041) connected to a LM4549 codec. It enables audio playback for the Versatile/PB platform. Limitations: - Supports only a playback on one channel (Versatile/Vexpress) - Supports only one TX FIFO in compact-mode or non-compact mode. - Supports playback of 12, 16, 18 and 20 bits samples. - Record is not supported. - The PL041 is hardwired to a LM4549 codec. Versatile/PB test build: linux-2.6.38.5 buildroot-2010.11 alsa-lib-1.0.22 alsa-utils-1.0.22 mpg123-0.66 Qemu host: Ubuntu 10.04 in Vmware/OS X Playback tested successfully with speaker-test/aplay/mpg123. Signed-off-by: Mathieu Sonet <contact@elasticsheep.com> [Peter Maydell: fixed typo in code clearing SL1RXBUSY/SL2RXBUSY bits, as spotted by Andrzej Zaborowski] Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
/*
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* LM4549 Audio Codec Interface
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*
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* Copyright (c) 2011
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* Written by Mathieu Sonet - www.elasticsheep.com
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*
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* This code is licenced under the GPL.
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*
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* *****************************************************************
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*/
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#ifndef HW_LM4549_H
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#define HW_LM4549_H
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#include "audio/audio.h"
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typedef void (*lm4549_callback)(void *opaque);
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#define LM4549_BUFFER_SIZE (512 * 2) /* 512 16-bit stereo samples */
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typedef struct {
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QEMUSoundCard card;
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SWVoiceOut *voice;
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uint32_t voice_is_active;
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uint16_t regfile[128];
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lm4549_callback data_req_cb;
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void *opaque;
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uint16_t buffer[LM4549_BUFFER_SIZE];
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uint32_t buffer_level;
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} lm4549_state;
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extern const VMStateDescription vmstate_lm4549_state;
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void lm4549_init(lm4549_state *s, lm4549_callback data_req, void *opaque);
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uint32_t lm4549_read(lm4549_state *s, target_phys_addr_t offset);
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void lm4549_write(lm4549_state *s, target_phys_addr_t offset, uint32_t value);
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uint32_t lm4549_write_samples(lm4549_state *s, uint32_t left, uint32_t right);
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#endif /* #ifndef HW_LM4549_H */
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