113 lines
3.8 KiB
C
113 lines
3.8 KiB
C
/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Paul Fleischer <paul@xpg.dk>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _S3C2440_I2S_H_
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#define _S3C2440_I2S_H_
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struct s3c2440_i2s_attach_args {
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void *i2sa_handle; /* Handle of the S3C2440 I2S Controller */
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};
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/* It should be possible to allocate most buffer sizes within
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2 segments.
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However, worst case actually is PHYSMEM / PAGE_SIZE, which seems to
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be 65535/4096 = 16 as default for most architectures.
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This does seem like a too pesimistic number.
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*/
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#define S3C2440_I2S_BUF_MAX_SEGS 2
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struct s3c2440_i2s_buf {
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void *i2b_parent; /* I2S handle */
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/* Size of the buffer */
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int i2b_size;
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/* Kernelspace virtual address of the buffer */
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void *i2b_addr;
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/* Physical segments holding the buffer */
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bus_dma_segment_t i2b_segs[S3C2440_I2S_BUF_MAX_SEGS];
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/* Number of segments in use */
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int i2b_nsegs;
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/* Map used for transfers DMA transfers */
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bus_dmamap_t i2b_dmamap;
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/* DMA transfer structure */
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dmac_xfer_t i2b_xfer;
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/* Callback */
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void (*i2b_cb)(void*);
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void *i2b_cb_cookie;
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};
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typedef struct s3c2440_i2s_buf* s3c2440_i2s_buf_t;
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void s3c2440_i2s_set_intr_lock(void *handle, kmutex_t *sc_intr_lock);
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#define S3C2440_I2S_NONE (0)
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#define S3C2440_I2S_TRANSMIT (1<<0)
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#define S3C2440_I2S_RECEIVE (1<<1)
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#define S3C2440_I2S_BOTH (S3C2440_I2S_TRANSMIT | S3C2440_I2S_RECEIVE)
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/* Set transfer direction of the I2S bus */
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void s3c2440_i2s_set_direction(void *handle, int direction);
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/* Set the I2S clocks (master and serial) from the given sample rate */
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void s3c2440_i2s_set_sample_rate(void *handle, int sample_rate);
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void s3c2440_i2s_set_sample_width(void *handle, int width);
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#define S3C2440_I2S_BUS_MSB 1
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#define S3C2440_I2S_BUS_I2S 2
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void s3c2440_i2s_set_bus_format(void *handle, int format);
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/* Enable the I2S bus */
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int s3c2440_i2s_commit(void *handle);
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/* Disable the I2S bus */
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int s3c2440_i2s_disable(void *handle);
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int s3c2440_i2s_get_master_clock(void *handle);
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int s3c2440_i2s_get_serial_clock(void *handle);
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/* Allocate a I2S buffer. */
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int s3c2440_i2s_alloc(void *, int, size_t, int, s3c2440_i2s_buf_t *);
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/* Free an I2S buffer. */
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void s3c2440_i2s_free(s3c2440_i2s_buf_t);
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/* Write data (from the I2S buffer) onto the I2S bus */
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int s3c2440_i2s_output(s3c2440_i2s_buf_t, void *, int, void (*)(void*), void*);
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int s3c2440_i2s_input(s3c2440_i2s_buf_t, void *, int, void (*)(void*), void*);
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int s3c2440_i2s_halt_output(s3c2440_i2s_buf_t);
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#endif
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