| 1 | /*
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| 2 | * Copyright (c) 2011 Jan Vesely
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 | /** @addtogroup drvaudiosb16
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| 29 | * @{
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| 30 | */
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| 31 | /** @file
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| 32 | * @brief DSP helper functions implementation
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| 33 | */
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| 34 |
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| 35 | #include <libarch/ddi.h>
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| 36 | #include "ddf_log.h"
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| 37 | #include "dsp_commands.h"
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| 38 | #include "dsp.h"
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| 39 |
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| 40 |
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| 41 | #ifndef DSP_RETRY_COUNT
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| 42 | #define DSP_RETRY_COUNT 100
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| 43 | #endif
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| 44 |
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| 45 | #define DSP_RESET_RESPONSE 0xaa
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| 46 |
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| 47 | static inline int sb_dsp_read(sb_dsp_t *dsp, uint8_t *data)
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| 48 | {
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| 49 | assert(data);
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| 50 | assert(dsp);
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| 51 | uint8_t status;
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| 52 | size_t attempts = DSP_RETRY_COUNT;
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| 53 | do {
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| 54 | status = pio_read_8(&dsp->regs->dsp_read_status);
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| 55 | } while (--attempts && ((status & DSP_READ_READY) == 0));
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| 56 |
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| 57 | if ((status & DSP_READ_READY) == 0)
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| 58 | return EIO;
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| 59 |
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| 60 | *data = pio_read_8(&dsp->regs->dsp_data_read);
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| 61 | return EOK;
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| 62 | }
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| 63 | /*----------------------------------------------------------------------------*/
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| 64 | static inline int sb_dsp_write(sb_dsp_t *dsp, uint8_t data)
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| 65 | {
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| 66 | assert(dsp);
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| 67 | uint8_t status;
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| 68 | size_t attempts = DSP_RETRY_COUNT;
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| 69 | do {
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| 70 | status = pio_read_8(&dsp->regs->dsp_write);
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| 71 | } while (--attempts && ((status & DSP_WRITE_BUSY) != 0));
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| 72 |
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| 73 | if ((status & DSP_WRITE_BUSY))
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| 74 | return EIO;
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| 75 |
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| 76 | pio_write_8(&dsp->regs->dsp_write, data);
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| 77 | return EOK;
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| 78 | }
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| 79 | /*----------------------------------------------------------------------------*/
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| 80 | static inline void sb_dsp_reset(sb_dsp_t *dsp)
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| 81 | {
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| 82 | assert(dsp);
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| 83 | /* Reset DSP, see Chapter 2 of Sound Blaster HW programming guide */
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| 84 | pio_write_8(&dsp->regs->dsp_reset, 1);
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| 85 | udelay(3); /* Keep reset for 3 us */
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| 86 | pio_write_8(&dsp->regs->dsp_reset, 0);
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| 87 | }
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| 88 | /*----------------------------------------------------------------------------*/
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| 89 | int sb_dsp_init(sb_dsp_t *dsp, sb16_regs_t *regs)
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| 90 | {
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| 91 | assert(dsp);
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| 92 | dsp->regs = regs;
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| 93 | sb_dsp_reset(dsp);
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| 94 | /* "DSP takes about 100 microseconds to initialize itself" */
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| 95 | udelay(100);
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| 96 | uint8_t response;
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| 97 | const int ret = sb_dsp_read(dsp, &response);
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| 98 | if (ret != EOK) {
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| 99 | ddf_log_error("Failed to read DSP reset response value.\n");
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| 100 | return ret;
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| 101 | }
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| 102 | if (response != DSP_RESET_RESPONSE) {
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| 103 | ddf_log_error("Invalid DSP reset response: %x.\n", response);
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| 104 | return EIO;
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| 105 | }
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| 106 |
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| 107 | /* Get DSP version number */
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| 108 | sb_dsp_write(dsp, DSP_VERSION);
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| 109 | sb_dsp_read(dsp, &dsp->version.major);
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| 110 | sb_dsp_read(dsp, &dsp->version.minor);
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| 111 | return EOK;
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| 112 | }
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| 113 | /*----------------------------------------------------------------------------*/
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| 114 | int sb_dsp_play_direct(sb_dsp_t *dsp, const uint8_t *data, size_t size,
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| 115 | unsigned sampling_rate, unsigned channels, unsigned bit_depth)
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| 116 | {
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| 117 | assert(dsp);
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| 118 | if (channels != 1 || bit_depth != 8)
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| 119 | return EIO;
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| 120 | /* In microseconds */
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| 121 | const unsigned wait_period = 1000000 / sampling_rate;
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| 122 | while (size--) {
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| 123 | pio_write_8(&dsp->regs->dsp_write, DIRECT_8B_OUTPUT);
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| 124 | pio_write_8(&dsp->regs->dsp_write, *data++);
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| 125 | udelay(wait_period);
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| 126 | }
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| 127 | return EOK;
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| 128 | }
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| 129 |
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| 130 | /**
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| 131 | * @}
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| 132 | */
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