/*      $NetBSD: dbdma.c,v 1.12 2016/07/15 21:08:27 macallan Exp $      */

/*
 * Copyright 1991-1998 by Open Software Foundation, Inc. 
 *              All Rights Reserved 
 *  
 * Permission to use, copy, modify, and distribute this software and 
 * its documentation for any purpose and without fee is hereby granted, 
 * provided that the above copyright notice appears in all copies and 
 * that both the copyright notice and this permission notice appear in 
 * supporting documentation. 
 *  
 * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 * FOR A PARTICULAR PURPOSE. 
 *  
 * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 
 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
 * 
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dbdma.c,v 1.12 2016/07/15 21:08:27 macallan Exp $");

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

#include <prop/proplib.h>

#include <uvm/uvm_extern.h>

#include <machine/autoconf.h>
#include <machine/pio.h>
#include <macppc/dev/dbdma.h>

dbdma_command_t *dbdma_alloc_commands = NULL;

void
dbdma_start(dbdma_regmap_t *dmap, dbdma_command_t *commands)
{
        unsigned long addr = vtophys((vaddr_t)commands);

        if (addr & 0xf)
                panic("dbdma_start command structure not 16-byte aligned %08x %08x", (uint32_t)commands, (uint32_t)addr);

        dmap->d_intselect = 0xff;  /* Endian magic - clear out interrupts */
        DBDMA_ST4_ENDIAN(&dmap->d_control, 
                         DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE |
                                             DBDMA_CNTRL_DEAD   |
                                             DBDMA_CNTRL_WAKE   |
                                             DBDMA_CNTRL_FLUSH  |
                                             DBDMA_CNTRL_PAUSE  |
                                             DBDMA_CNTRL_RUN      )));      
     
        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
                ;

        dmap->d_cmdptrhi = 0;   /* 64-bit not yet */
        DBDMA_ST4_ENDIAN(&dmap->d_cmdptrlo, addr);

        DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN));
}

void
dbdma_stop(dbdma_regmap_t *dmap)
{
        out32rb(&dmap->d_control, DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_RUN) |
                          DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));

        while (in32rb(&dmap->d_status) &
                (DBDMA_CNTRL_ACTIVE|DBDMA_CNTRL_FLUSH));
}

void
dbdma_flush(dbdma_regmap_t *dmap)
{
        out32rb(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));

        while (in32rb(&dmap->d_status) & (DBDMA_CNTRL_FLUSH));
}

void
dbdma_reset(dbdma_regmap_t *dmap)
{
        out32rb(&dmap->d_control, 
                         DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE |
                                             DBDMA_CNTRL_DEAD   |
                                             DBDMA_CNTRL_WAKE   |
                                             DBDMA_CNTRL_FLUSH  |
                                             DBDMA_CNTRL_PAUSE  |
                                             DBDMA_CNTRL_RUN      )));      

        while (in32rb(&dmap->d_status) & DBDMA_CNTRL_RUN);
}

void
dbdma_continue(dbdma_regmap_t *dmap)
{
        out32rb(&dmap->d_control,
                DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN | DBDMA_CNTRL_WAKE) |
                DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_PAUSE | DBDMA_CNTRL_DEAD));
}

void
dbdma_pause(dbdma_regmap_t *dmap)
{
        DBDMA_ST4_ENDIAN(&dmap->d_control,DBDMA_SET_CNTRL(DBDMA_CNTRL_PAUSE));

        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
                ;
}

dbdma_command_t *
dbdma_alloc(int size, void **fp)
{
        u_int buf;

        buf = (u_int)kmem_alloc(size + 0x0f, KM_SLEEP);
        if (fp != NULL) {
         *fp = (void *)buf;
        }
        buf = (buf + 0x0f) & ~0x0f;

        return (dbdma_command_t *)buf;
}

void
dbdma_free(void *ptr, int size)
{
        kmem_free(ptr, size + 0x0f);
}