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// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/m68k/sun3/dvma.c
*
* Written by Sam Creasey
*
* Sun3 IOMMU routines used for dvma accesses.
*
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/list.h>
#include <asm/page.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);
// pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte);
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 __init sun3_dvma_init(void)
{
memset(ptelist, 0, sizeof(ptelist));
}
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