/* $NetBSD: bba.c,v 1.46 2020/09/12 05:19:16 isaki Exp $ */

/*
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/* maxine/alpha baseboard audio (bba) */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bba.c,v 1.46 2020/09/12 05:19:16 isaki Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/kmem.h>

#include <sys/bus.h>
#include <machine/autoconf.h>
#include <sys/cpu.h>

#include <sys/audioio.h>
#include <dev/audio/audio_if.h>

#include <dev/ic/am7930reg.h>
#include <dev/ic/am7930var.h>

#include <dev/tc/tcvar.h>
#include <dev/tc/ioasicreg.h>
#include <dev/tc/ioasicvar.h>

/* include mulaw.c (not .h file) here to expand mulaw32 */
void audio_mulaw32_to_internal(audio_filter_arg_t *);
void audio_internal_to_mulaw32(audio_filter_arg_t *);
#define MULAW32
#include <dev/audio/mulaw.c>

#ifdef AUDIO_DEBUG
#define DPRINTF(x)      if (am7930debug) printf x
#else
#define DPRINTF(x)
#endif  /* AUDIO_DEBUG */

#define BBA_MAX_DMA_SEGMENTS    16
#define BBA_DMABUF_SIZE         (BBA_MAX_DMA_SEGMENTS*IOASIC_DMA_BLOCKSIZE)
#define BBA_DMABUF_ALIGN        IOASIC_DMA_BLOCKSIZE
#define BBA_DMABUF_BOUNDARY     0

struct bba_mem {
        struct bba_mem *next;
        bus_addr_t addr;
        bus_size_t size;
        void *kva;
};

struct bba_dma_state {
        bus_dmamap_t dmam;              /* DMA map */
        int active;
        int curseg;                     /* current segment in DMA buffer */
        void (*intr)(void *);           /* higher-level audio handler */
        void *intr_arg;
};

struct bba_softc {
        struct am7930_softc sc_am7930;          /* glue to MI code */

        bus_space_tag_t sc_bst;                 /* IOASIC bus tag/handle */
        bus_space_handle_t sc_bsh;
        bus_dma_tag_t sc_dmat;
        bus_space_handle_t sc_codec_bsh;        /* codec bus space handle */

        struct bba_mem *sc_mem_head;            /* list of buffers */

        struct bba_dma_state sc_tx_dma_state;
        struct bba_dma_state sc_rx_dma_state;
};

static int      bba_match(device_t, cfdata_t, void *);
static void     bba_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(bba, sizeof(struct bba_softc),
    bba_match, bba_attach, NULL, NULL);

/*
 * Define our interface into the am7930 MI driver.
 */

static uint8_t  bba_codec_dread(struct am7930_softc *, int);
static void     bba_codec_dwrite(struct am7930_softc *, int, uint8_t);

struct am7930_glue bba_glue = {
        bba_codec_dread,
        bba_codec_dwrite,
};

/*
 * Define our interface to the higher level audio driver.
 */

static int      bba_query_format(void *, audio_format_query_t *);
static int      bba_set_format(void *, int,
                                const audio_params_t *, const audio_params_t *,
                                audio_filter_reg_t *, audio_filter_reg_t *);
static int      bba_round_blocksize(void *, int, int, const audio_params_t *);
static int      bba_halt_output(void *);
static int      bba_halt_input(void *);
static int      bba_getdev(void *, struct audio_device *);
static void     *bba_allocm(void *, int, size_t);
static void     bba_freem(void *, void *, size_t);
static size_t   bba_round_buffersize(void *, int, size_t);
static int      bba_trigger_output(void *, void *, void *, int,
                                   void (*)(void *), void *,
                                   const audio_params_t *);
static int      bba_trigger_input(void *, void *, void *, int,
                                  void (*)(void *), void *,
                                  const audio_params_t *);

static const struct audio_hw_if sa_hw_if = {
        .query_format           = bba_query_format,
        .set_format             = bba_set_format,
        .round_blocksize        = bba_round_blocksize,  /* md */
        .commit_settings        = am7930_commit_settings,
        .halt_output            = bba_halt_output,      /* md */
        .halt_input             = bba_halt_input,       /* md */
        .getdev                 = bba_getdev,
        .set_port               = am7930_set_port,
        .get_port               = am7930_get_port,
        .query_devinfo          = am7930_query_devinfo,
        .allocm                 = bba_allocm,           /* md */
        .freem                  = bba_freem,            /* md */
        .round_buffersize       = bba_round_buffersize, /* md */
        .get_props              = am7930_get_props,
        .trigger_output         = bba_trigger_output,   /* md */
        .trigger_input          = bba_trigger_input,    /* md */
        .get_locks              = am7930_get_locks,
};

static struct audio_device bba_device = {
        "am7930",
        "x",
        "bba"
};

static const struct audio_format bba_format = {
        .mode           = AUMODE_PLAY | AUMODE_RECORD,
        .encoding       = AUDIO_ENCODING_ULAW, /* XXX */
        .validbits      = 32,
        .precision      = 32,
        .channels       = 1,
        .channel_mask   = AUFMT_MONAURAL,
        .frequency_type = 1,
        .frequency      = { 8000 },
};

static int      bba_intr(void *);
static void     bba_reset(struct bba_softc *, int);

static int
bba_match(device_t parent, cfdata_t cf, void *aux)
{
        struct ioasicdev_attach_args *ia;

        ia = aux;
        if (strcmp(ia->iada_modname, "isdn") != 0 &&
            strcmp(ia->iada_modname, "AMD79c30") != 0)
                return 0;

        return 1;
}


static void
bba_attach(device_t parent, device_t self, void *aux)
{
        struct ioasicdev_attach_args *ia;
        struct bba_softc *sc;
        struct am7930_softc *amsc;
        struct ioasic_softc *iosc = device_private(parent);

        ia = aux;
        sc = device_private(self);
        amsc = &sc->sc_am7930;
        amsc->sc_dev = self;
        sc->sc_bst = iosc->sc_bst;
        sc->sc_bsh = iosc->sc_bsh;
        sc->sc_dmat = iosc->sc_dmat;

        /* get the bus space handle for codec */
        if (bus_space_subregion(sc->sc_bst, sc->sc_bsh,
            ia->iada_offset, 0, &sc->sc_codec_bsh)) {
                aprint_error_dev(self, "unable to map device\n");
                return;
        }

        printf("\n");

        bba_reset(sc, 1);

        /*
         * Set up glue for MI code early; we use some of it here.
         */
        amsc->sc_glue = &bba_glue;

        /*
         *  MI initialisation.  We will be doing DMA.
         */
        am7930_init(amsc, AUDIOAMD_DMA_MODE);

        ioasic_intr_establish(parent, ia->iada_cookie, TC_IPL_NONE,
            bba_intr, sc);

        audio_attach_mi(&sa_hw_if, sc, self);
}


static void
bba_reset(struct bba_softc *sc, int reset)
{
        uint32_t ssr;

        /* disable any DMA and reset the codec */
        ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
        ssr &= ~(IOASIC_CSR_DMAEN_ISDN_T | IOASIC_CSR_DMAEN_ISDN_R);
        if (reset)
                ssr &= ~IOASIC_CSR_ISDN_ENABLE;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
        DELAY(10);      /* 400ns required for codec to reset */

        /* initialise DMA pointers */
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_DMAPTR, -1);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_NEXTPTR, -1);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_DMAPTR, -1);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_NEXTPTR, -1);

        /* take out of reset state */
        if (reset) {
                ssr |= IOASIC_CSR_ISDN_ENABLE;
                bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
        }
}


static void *
bba_allocm(void *addr, int direction, size_t size)
{
        struct am7930_softc *amsc;
        struct bba_softc *sc;
        bus_dma_segment_t seg;
        int rseg;
        void *kva;
        struct bba_mem *m;
        int state;

        DPRINTF(("bba_allocm: size = %zu\n", size));
        sc = addr;
        amsc = addr;
        state = 0;

        if (bus_dmamem_alloc(sc->sc_dmat, size, BBA_DMABUF_ALIGN,
            BBA_DMABUF_BOUNDARY, &seg, 1, &rseg, BUS_DMA_WAITOK)) {
                aprint_error_dev(amsc->sc_dev, "can't allocate DMA buffer\n");
                goto bad;
        }
        state |= 1;

        if (bus_dmamem_map(sc->sc_dmat, &seg, rseg, size,
            &kva, BUS_DMA_WAITOK | BUS_DMA_COHERENT)) {
                aprint_error_dev(amsc->sc_dev, "can't map DMA buffer\n");
                goto bad;
        }
        state |= 2;

        m = kmem_alloc(sizeof(struct bba_mem), KM_SLEEP);
        m->addr = seg.ds_addr;
        m->size = seg.ds_len;
        m->kva = kva;
        m->next = sc->sc_mem_head;
        sc->sc_mem_head = m;

        return (void *)kva;

bad:
        if (state & 2)
                bus_dmamem_unmap(sc->sc_dmat, kva, size);
        if (state & 1)
                bus_dmamem_free(sc->sc_dmat, &seg, 1);
        return NULL;
}


static void
bba_freem(void *addr, void *ptr, size_t size)
{
        struct bba_softc *sc;
        struct bba_mem **mp, *m;
        bus_dma_segment_t seg;
        void *kva;

        sc = addr;
        kva = (void *)addr;
        for (mp = &sc->sc_mem_head; *mp && (*mp)->kva != kva;
            mp = &(*mp)->next)
                continue;
        m = *mp;
        if (m == NULL) {
                printf("bba_freem: freeing unallocated memory\n");
                return;
        }
        *mp = m->next;
        bus_dmamem_unmap(sc->sc_dmat, kva, m->size);

        seg.ds_addr = m->addr;
        seg.ds_len = m->size;
        bus_dmamem_free(sc->sc_dmat, &seg, 1);
        kmem_free(m, sizeof(struct bba_mem));
}


static size_t
bba_round_buffersize(void *addr, int direction, size_t size)
{

        DPRINTF(("bba_round_buffersize: size=%zu\n", size));
        return size > BBA_DMABUF_SIZE ? BBA_DMABUF_SIZE :
            roundup(size, IOASIC_DMA_BLOCKSIZE);
}


static int
bba_halt_output(void *addr)
{
        struct bba_softc *sc;
        struct bba_dma_state *d;
        uint32_t ssr;

        sc = addr;
        d = &sc->sc_tx_dma_state;
        /* disable any DMA */
        ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
        ssr &= ~IOASIC_CSR_DMAEN_ISDN_T;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_DMAPTR, -1);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_NEXTPTR, -1);

        if (d->active) {
                bus_dmamap_unload(sc->sc_dmat, d->dmam);
                bus_dmamap_destroy(sc->sc_dmat, d->dmam);
                d->active = 0;
        }

        return 0;
}


static int
bba_halt_input(void *addr)
{
        struct bba_softc *sc;
        struct bba_dma_state *d;
        uint32_t ssr;

        sc = addr;
        d = &sc->sc_rx_dma_state;
        /* disable any DMA */
        ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
        ssr &= ~IOASIC_CSR_DMAEN_ISDN_R;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_DMAPTR, -1);
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_NEXTPTR, -1);

        if (d->active) {
                bus_dmamap_unload(sc->sc_dmat, d->dmam);
                bus_dmamap_destroy(sc->sc_dmat, d->dmam);
                d->active = 0;
        }

        return 0;
}


static int
bba_getdev(void *addr, struct audio_device *retp)
{

        *retp = bba_device;
        return 0;
}


static int
bba_trigger_output(void *addr, void *start, void *end, int blksize,
                   void (*intr)(void *), void *arg,
                   const audio_params_t *param)
{
        struct bba_softc *sc;
        struct bba_dma_state *d;
        uint32_t ssr;
        tc_addr_t phys, nphys;
        int state;

        DPRINTF(("bba_trigger_output: sc=%p start=%p end=%p blksize=%d intr=%p(%p)\n",
            addr, start, end, blksize, intr, arg));
        sc = addr;
        d = &sc->sc_tx_dma_state;
        state = 0;

        /* disable any DMA */
        ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
        ssr &= ~IOASIC_CSR_DMAEN_ISDN_T;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);

        if (bus_dmamap_create(sc->sc_dmat, (char *)end - (char *)start,
            BBA_MAX_DMA_SEGMENTS, IOASIC_DMA_BLOCKSIZE,
            BBA_DMABUF_BOUNDARY, BUS_DMA_NOWAIT, &d->dmam)) {
                printf("bba_trigger_output: can't create DMA map\n");
                goto bad;
        }
        state |= 1;

        if (bus_dmamap_load(sc->sc_dmat, d->dmam, start,
            (char *)end - (char *)start, NULL, BUS_DMA_WRITE|BUS_DMA_NOWAIT)) {
                printf("bba_trigger_output: can't load DMA map\n");
                goto bad;
        }
        state |= 2;

        d->intr = intr;
        d->intr_arg = arg;
        d->curseg = 1;

        /* get physical address of buffer start */
        phys = (tc_addr_t)d->dmam->dm_segs[0].ds_addr;
        nphys = (tc_addr_t)d->dmam->dm_segs[1].ds_addr;

        /* setup DMA pointer */
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_DMAPTR,
            IOASIC_DMA_ADDR(phys));
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_X_NEXTPTR,
            IOASIC_DMA_ADDR(nphys));

        /* kick off DMA */
        ssr |= IOASIC_CSR_DMAEN_ISDN_T;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);

        d->active = 1;

        return 0;

bad:
        if (state & 2)
                bus_dmamap_unload(sc->sc_dmat, d->dmam);
        if (state & 1)
                bus_dmamap_destroy(sc->sc_dmat, d->dmam);
        return 1;
}


static int
bba_trigger_input(void *addr, void *start, void *end, int blksize,
                  void (*intr)(void *), void *arg, const audio_params_t *param)
{
        struct bba_softc *sc;
        struct bba_dma_state *d;
        tc_addr_t phys, nphys;
        uint32_t ssr;
        int state = 0;

        DPRINTF(("bba_trigger_input: sc=%p start=%p end=%p blksize=%d intr=%p(%p)\n",
            addr, start, end, blksize, intr, arg));
        sc = addr;
        d = &sc->sc_rx_dma_state;
        state = 0;

        /* disable any DMA */
        ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
        ssr &= ~IOASIC_CSR_DMAEN_ISDN_R;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);

        if (bus_dmamap_create(sc->sc_dmat, (char *)end - (char *)start,
            BBA_MAX_DMA_SEGMENTS, IOASIC_DMA_BLOCKSIZE,
            BBA_DMABUF_BOUNDARY, BUS_DMA_NOWAIT, &d->dmam)) {
                printf("bba_trigger_input: can't create DMA map\n");
                goto bad;
        }
        state |= 1;

        if (bus_dmamap_load(sc->sc_dmat, d->dmam, start,
            (char *)end - (char *)start, NULL, BUS_DMA_READ|BUS_DMA_NOWAIT)) {
                printf("bba_trigger_input: can't load DMA map\n");
                goto bad;
        }
        state |= 2;

        d->intr = intr;
        d->intr_arg = arg;
        d->curseg = 1;

        /* get physical address of buffer start */
        phys = (tc_addr_t)d->dmam->dm_segs[0].ds_addr;
        nphys = (tc_addr_t)d->dmam->dm_segs[1].ds_addr;

        /* setup DMA pointer */
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_DMAPTR,
            IOASIC_DMA_ADDR(phys));
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_ISDN_R_NEXTPTR,
            IOASIC_DMA_ADDR(nphys));

        /* kick off DMA */
        ssr |= IOASIC_CSR_DMAEN_ISDN_R;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);

        d->active = 1;

        return 0;

bad:
        if (state & 2)
                bus_dmamap_unload(sc->sc_dmat, d->dmam);
        if (state & 1)
                bus_dmamap_destroy(sc->sc_dmat, d->dmam);
        return 1;
}

static int
bba_intr(void *addr)
{
        struct bba_softc *sc;
        struct bba_dma_state *d;
        tc_addr_t nphys;
        int mask;

        sc = addr;
        mutex_enter(&sc->sc_am7930.sc_intr_lock);

        mask = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_INTR);

        if (mask & IOASIC_INTR_ISDN_TXLOAD) {
                d = &sc->sc_tx_dma_state;
                d->curseg = (d->curseg+1) % d->dmam->dm_nsegs;
                nphys = (tc_addr_t)d->dmam->dm_segs[d->curseg].ds_addr;
                bus_space_write_4(sc->sc_bst, sc->sc_bsh,
                    IOASIC_ISDN_X_NEXTPTR, IOASIC_DMA_ADDR(nphys));
                if (d->intr != NULL)
                        (*d->intr)(d->intr_arg);
        }
        if (mask & IOASIC_INTR_ISDN_RXLOAD) {
                d = &sc->sc_rx_dma_state;
                d->curseg = (d->curseg+1) % d->dmam->dm_nsegs;
                nphys = (tc_addr_t)d->dmam->dm_segs[d->curseg].ds_addr;
                bus_space_write_4(sc->sc_bst, sc->sc_bsh,
                    IOASIC_ISDN_R_NEXTPTR, IOASIC_DMA_ADDR(nphys));
                if (d->intr != NULL)
                        (*d->intr)(d->intr_arg);
        }

        mutex_exit(&sc->sc_am7930.sc_intr_lock);

        return 0;
}

static int
bba_query_format(void *addr, audio_format_query_t *afp)
{

        return audio_query_format(&bba_format, 1, afp);
}

static int
bba_set_format(void *addr, int setmode,
                const audio_params_t *play, const audio_params_t *rec,
                audio_filter_reg_t *pfil, audio_filter_reg_t *rfil)
{

        if ((setmode & AUMODE_PLAY) != 0) {
                pfil->codec = audio_internal_to_mulaw32;
        }
        if ((setmode & AUMODE_RECORD) != 0) {
                rfil->codec = audio_mulaw32_to_internal;
        }

        return 0;
}

static int
bba_round_blocksize(void *addr, int blk, int mode, const audio_params_t *param)
{

        return IOASIC_DMA_BLOCKSIZE;
}


/* direct write */
static void
bba_codec_dwrite(struct am7930_softc *amsc, int reg, uint8_t val)
{
        struct bba_softc *sc;

        sc = (struct bba_softc *)amsc;
        DPRINTF(("bba_codec_dwrite(): sc=%p, reg=%d, val=%d\n", sc, reg, val));

#if defined(__alpha__)
        bus_space_write_4(sc->sc_bst, sc->sc_codec_bsh,
            reg << 2, val << 8);
#else
        bus_space_write_4(sc->sc_bst, sc->sc_codec_bsh,
            reg << 6, val);
#endif
}

/* direct read */
static uint8_t
bba_codec_dread(struct am7930_softc *amsc, int reg)
{
        struct bba_softc *sc;

        sc = (struct bba_softc *)amsc;
        DPRINTF(("bba_codec_dread(): sc=%p, reg=%d\n", sc, reg));

#if defined(__alpha__)
        return ((bus_space_read_4(sc->sc_bst, sc->sc_codec_bsh,
                reg << 2) >> 8) & 0xff);
#else
        return (bus_space_read_4(sc->sc_bst, sc->sc_codec_bsh,
                reg << 6) & 0xff);
#endif
}