source: mainline/uspace/drv/audio/sb16/dsp.c@ ef246b9

/*
 * Copyright (c) 2011 Jan Vesely
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/** @addtogroup drvaudiosb16
 * @{
 */
/** @file
 * @brief DSP helper functions implementation
 */

#include <devman.h>
#include <device/hw_res.h>
#include <libarch/ddi.h>
#include <libarch/barrier.h>
#include <str_error.h>
#include <bool.h>

#include "dma.h"
#include "ddf_log.h"
#include "dsp_commands.h"
#include "dsp.h"

#define BUFFER_ID 1
#define MAX_BUFFER_SIZE (PAGE_SIZE)

#ifndef DSP_RETRY_COUNT
#define DSP_RETRY_COUNT 100
#endif

#define DSP_RESET_RESPONSE 0xaa

#define AUTO_DMA_MODE

static inline int sb_dsp_read(sb_dsp_t *dsp, uint8_t *data)
{
        assert(data);
        assert(dsp);
        uint8_t status;
        size_t attempts = DSP_RETRY_COUNT;
        do {
                status = pio_read_8(&dsp->regs->dsp_read_status);
        } while (--attempts && ((status & DSP_READ_READY) == 0));

        if ((status & DSP_READ_READY) == 0)
                return EIO;

        *data = pio_read_8(&dsp->regs->dsp_data_read);
        return EOK;
}

static inline int sb_dsp_write(sb_dsp_t *dsp, uint8_t data)
{
        assert(dsp);
        uint8_t status;
        size_t attempts = DSP_RETRY_COUNT;
        do {
                status = pio_read_8(&dsp->regs->dsp_write);
        } while (--attempts && ((status & DSP_WRITE_BUSY) != 0));

        if ((status & DSP_WRITE_BUSY))
                return EIO;

        pio_write_8(&dsp->regs->dsp_write, data);
        return EOK;
}

static inline void sb_dsp_reset(sb_dsp_t *dsp)
{
        assert(dsp);
        /* Reset DSP, see Chapter 2 of Sound Blaster HW programming guide */
        pio_write_8(&dsp->regs->dsp_reset, 1);
        udelay(3); /* Keep reset for 3 us */
        pio_write_8(&dsp->regs->dsp_reset, 0);
}

static inline int sb_setup_dma(sb_dsp_t *dsp, uintptr_t pa, size_t size)
{
        async_sess_t *sess = devman_parent_device_connect(EXCHANGE_ATOMIC,
            dsp->sb_dev->handle, IPC_FLAG_BLOCKING);
        if (!sess)
                return ENOMEM;

        const int ret = hw_res_dma_channel_setup(sess,
            dsp->dma16_channel, pa, size,
            DMA_MODE_READ | DMA_MODE_AUTO | DMA_MODE_ON_DEMAND);
        async_hangup(sess);
        return ret;
}

static inline int sb_setup_buffer(sb_dsp_t *dsp, size_t size)
{
        assert(dsp);
        if (size > MAX_BUFFER_SIZE || size == 0 || (size % 2) == 1)
                size = MAX_BUFFER_SIZE;
        uint8_t *buffer = dma_create_buffer24(size);
        if (buffer == NULL) {
                ddf_log_error("Failed to allocate DMA buffer.");
                return ENOMEM;
        }

        const uintptr_t pa = addr_to_phys(buffer);
        assert(pa < (1 << 25));

        /* Set 16 bit channel */
        const int ret = sb_setup_dma(dsp, pa, size);
        if (ret == EOK) {
                dsp->buffer.data = buffer;
                dsp->buffer.size = size;
                bzero(dsp->buffer.data, dsp->buffer.size);
        } else {
                ddf_log_error("Failed to setup DMA16 channel: %s.",
                    str_error(ret));
                dma_destroy_buffer(buffer);
        }
        return ret;
}

static inline void sb_clear_buffer(sb_dsp_t *dsp)
{
        dma_destroy_buffer(dsp->buffer.data);
        dsp->buffer.data = NULL;
        dsp->buffer.size = 0;
}

static inline size_t sample_count(unsigned sample_size, size_t byte_count)
{
        if (sample_size == 16) {
                return byte_count / 2;
        }
        return byte_count;
}

int sb_dsp_init(sb_dsp_t *dsp, sb16_regs_t *regs, ddf_dev_t *dev,
    int dma8, int dma16)
{
        assert(dsp);
        dsp->regs = regs;
        dsp->dma8_channel = dma8;
        dsp->dma16_channel = dma16;
        dsp->event_session = NULL;
        dsp->event_exchange = NULL;
        dsp->sb_dev = dev;
        sb_dsp_reset(dsp);
        /* "DSP takes about 100 microseconds to initialize itself" */
        udelay(100);
        uint8_t response;
        const int ret = sb_dsp_read(dsp, &response);
        if (ret != EOK) {
                ddf_log_error("Failed to read DSP reset response value.");
                return ret;
        }
        if (response != DSP_RESET_RESPONSE) {
                ddf_log_error("Invalid DSP reset response: %x.", response);
                return EIO;
        }

        /* Get DSP version number */
        sb_dsp_write(dsp, DSP_VERSION);
        sb_dsp_read(dsp, &dsp->version.major);
        sb_dsp_read(dsp, &dsp->version.minor);

        return ret;
}

void sb_dsp_interrupt(sb_dsp_t *dsp)
{
        assert(dsp);
        if (dsp->event_exchange) {
                async_msg_0(dsp->event_exchange, IPC_FIRST_USER_METHOD);
        } else {
                ddf_log_warning("Interrupt with no event consumer.");
        }
#ifndef AUTO_DMA_MODE
        sb_dsp_write(dsp, SINGLE_DMA_16B_DA);
        sb_dsp_write(dsp, dsp->playing.mode);
        sb_dsp_write(dsp, (dsp->playing.samples - 1) & 0xff);
        sb_dsp_write(dsp, (dsp->playing.samples - 1) >> 8);
#endif
}

int sb_dsp_get_buffer(sb_dsp_t *dsp, void **buffer, size_t *size, unsigned *id)
{
        assert(dsp);
        assert(size);

        /* buffer is already setup by for someone, refuse to work until
         * it's released */
        if (dsp->buffer.data)
                return EBUSY;

        const int ret = sb_setup_buffer(dsp, *size);
        if (ret == EOK) {
                ddf_log_debug("Providing buffer(%u): %p, %zu B.",
                    BUFFER_ID, dsp->buffer.data, dsp->buffer.size);

                if (buffer)
                        *buffer = dsp->buffer.data;
                if (size)
                        *size = dsp->buffer.size;
                if (id)
                        *id = BUFFER_ID;
        }
        return ret;
}

int sb_dsp_set_event_session(sb_dsp_t *dsp, unsigned id, async_sess_t *session)
{
        assert(dsp);
        assert(session);
        if (id != BUFFER_ID)
                return ENOENT;
        if (dsp->event_session)
                return EBUSY;
        dsp->event_session = session;
        ddf_log_debug("Set event session.");
        return EOK;
}

int sb_dsp_release_buffer(sb_dsp_t *dsp, unsigned id)
{
        assert(dsp);
        if (id != BUFFER_ID)
                return ENOENT;
        sb_clear_buffer(dsp);
        async_exchange_end(dsp->event_exchange);
        dsp->event_exchange = NULL;
        if (dsp->event_session)
                async_hangup(dsp->event_session);
        dsp->event_session = NULL;
        ddf_log_debug("DSP buffer released.");
        return EOK;
}

int sb_dsp_start_playback(sb_dsp_t *dsp, unsigned id, unsigned parts,
    unsigned sampling_rate, unsigned sample_size, unsigned channels, bool sign)
{
        assert(dsp);

        if (!dsp->event_session)
                return EINVAL;

        /* Play block size must be even number (we use DMA 16)*/
        if (dsp->buffer.size % (parts * 2))
                return EINVAL;

        const unsigned play_block_size = dsp->buffer.size / parts;

        /* Check supported parameters */
        ddf_log_debug("Requested playback on buffer \"%u\" (%u parts): %uHz, "
            "%ssinged %u bit, %u channel(s).", id, parts, sampling_rate,
            sign ? "" : "un", sample_size, channels);
        if (id != BUFFER_ID)
                return ENOENT;
        if (sample_size != 16) // FIXME We only support 16 bit playback
                return ENOTSUP;
        if (channels != 1 && channels != 2)
                return ENOTSUP;
        if (sampling_rate > 44100)
                return ENOTSUP;

        dsp->event_exchange = async_exchange_begin(dsp->event_session);
        if (!dsp->event_exchange)
                return ENOMEM;

        sb_dsp_write(dsp, SET_SAMPLING_RATE_OUTPUT);
        sb_dsp_write(dsp, sampling_rate >> 8);
        sb_dsp_write(dsp, sampling_rate & 0xff);

        ddf_log_verbose("Sampling rate: %hhx:%hhx.",
            sampling_rate >> 8, sampling_rate & 0xff);

#ifdef AUTO_DMA_MODE
        sb_dsp_write(dsp, AUTO_DMA_16B_DA_FIFO);
#else
        sb_dsp_write(dsp, SINGLE_DMA_16B_DA_FIFO);
#endif

        dsp->playing.mode = 0 |
            (sign ? DSP_MODE_SIGNED : 0) | (channels == 2 ? DSP_MODE_STEREO : 0);
        sb_dsp_write(dsp, dsp->playing.mode);

        dsp->playing.samples = sample_count(sample_size, play_block_size);
        sb_dsp_write(dsp, (dsp->playing.samples - 1) & 0xff);
        sb_dsp_write(dsp, (dsp->playing.samples - 1) >> 8);

        ddf_log_verbose("Playback started, interrupt every %u samples "
            "(~1/%u sec)", dsp->playing.samples,
            sampling_rate / dsp->playing.samples);

        return EOK;
}

int sb_dsp_stop_playback(sb_dsp_t *dsp, unsigned id)
{
        assert(dsp);
        if (id != BUFFER_ID)
                return ENOENT;
        async_exchange_end(dsp->event_exchange);
        sb_dsp_write(dsp, DMA_16B_EXIT);
        return EOK;
}

int sb_dsp_start_record(sb_dsp_t *dsp, unsigned id, unsigned sample_rate,
    unsigned sample_size, unsigned channels, bool sign)
{
        return ENOTSUP;
}

int sb_dsp_stop_record(sb_dsp_t *dsp, unsigned id)
{
        return ENOTSUP;
}
/**
 * @}
 */