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/* dvma.c:  Routines that are used to access DMA on the Sparc SBus.

 *

 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)

 */

#include <linux/kernel.h>

#include <linux/malloc.h>

#include <asm/oplib.h>

#include <asm/contregs.h>

#include <asm/sysen.h>

#include <asm/delay.h>

#include <asm/idprom.h>

#include <asm/machines.h>

#include <asm/io.h>

#include <asm/dma.h>

#include <asm/sbus.h>

#include <asm/vac-ops.h>

#include <asm/vaddrs.h>

struct Linux_SBus_DMA *dma_chain;

/* Print out the current values in the DMA control registers */

void

dump_dma_regs(struct sparc_dma_registers *dregs)

{

        printk("DMA CONTROL<%08lx>  ADDR<%08lx> CNT<%08lx> TEST<%08lx>\n",

               dregs->cond_reg,

               (unsigned long) dregs->st_addr,

               (unsigned long) dregs->cnt,

               (unsigned long) dregs->dma_test);

        return;

}

/* Probe this SBus DMA module(s) */

unsigned long

dvma_init(struct linux_sbus *sbus, unsigned long memory_start)

{

        struct linux_sbus_device *this_dev;

        struct Linux_SBus_DMA *dma;

        struct Linux_SBus_DMA *dchain;

        static int num_dma=0;

        for_each_sbusdev(this_dev, sbus) {

                if(strcmp(this_dev->prom_name, "dma") &&

                   strcmp(this_dev->prom_name, "ledma") &&

                   strcmp(this_dev->prom_name, "espdma"))

                        continue;

                /* Found one... */

                dma = (struct Linux_SBus_DMA *) memory_start;

                memory_start += sizeof(struct Linux_SBus_DMA);

                dma->SBus_dev = this_dev;

                /* Put at end of dma chain */

                dchain = dma_chain;

                if(dchain) {

                        while(dchain->next) dchain=dchain->next;

                        dchain->next=dma;

                } else {

                        /* We're the first in line */

                        dma_chain=dma;

                }

                dma->next = 0;

                printk("dma%d: ", num_dma);

                num_dma++;

                /* The constant PAGE_SIZE that is passed to sparc_alloc_io makes the

                 * routine only alloc 1 page, that was what the original code did

                 */

                prom_apply_sbus_ranges(dma->SBus_dev->reg_addrs, 0x1);

                dma->regs = (struct sparc_dma_registers *)

                        sparc_alloc_io (dma->SBus_dev->reg_addrs[0].phys_addr, 0,

                                        PAGE_SIZE, "dma",

                                        dma->SBus_dev->reg_addrs[0].which_io, 0x0);

                dma->node = dma->SBus_dev->prom_node;

                dma->running=0;      /* No transfers going on as of yet */

                dma->allocated=0;    /* No one has allocated us yet */

                switch((dma->regs->cond_reg)&DMA_DEVICE_ID) {

                case DMA_VERS0:

                        dma->revision=dvmarev0;

                        printk("Revision 0 ");

                        break;

                case DMA_ESCV1:

                        dma->revision=dvmaesc1;

                        printk("ESC Revision 1 ");

                        break;

                case DMA_VERS1:

                        dma->revision=dvmarev1;

                        printk("Revision 1 ");

                        break;

                case DMA_VERS2:

                        dma->revision=dvmarev2;

                        printk("Revision 2 ");

                        break;

                case DMA_VERSPLUS:

                        dma->revision=dvmarevplus;

                        printk("Revision 1 PLUS ");

                        break;

                default:

                        printk("unknown dma version");

                        dma->allocated = 1;

                        break;

                }

                printk("\n");

#if 0 /* Clutters up the screen */

                dump_dma_regs(dma->regs);

#endif

        };  /* while(this_dev) */

        return memory_start;

}