/* $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
}

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