dvma.c

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/*
 * linux/arch/m68k/sun3/dvma.c
 *
 * Written by Sam Creasey
 *
 * Sun3 IOMMU routines used for dvma accesses.
 *
 */

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/list.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/sun3mmu.h>
#include <asm/dvma.h>


static unsigned long ptelist[120];

static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
{
    unsigned long pte;
    unsigned long j;
    pte_t ptep;

    j = *(volatile unsigned long *)kaddr;
    *(volatile unsigned long *)kaddr = j;

    ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL);
    pte = pte_val(ptep);
//      printk("dvma_remap: addr %lx -> %lx pte %08lx len %x\n",
//             kaddr, vaddr, pte, len);
    if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
        sun3_put_pte(vaddr, pte);
        ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
    }

    return (vaddr + (kaddr & ~PAGE_MASK));

}

int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
                  int len)
{

    unsigned long end;
    unsigned long vaddr;

    vaddr = dvma_btov(baddr);

    end = vaddr + len;

    while(vaddr < end) {
        dvma_page(kaddr, vaddr);
        kaddr += PAGE_SIZE;
        vaddr += PAGE_SIZE;
    }

    return 0;

}

void sun3_dvma_init(void)
{

    memset(ptelist, 0, sizeof(ptelist));


}