70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
// 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/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);
|
|
// 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));
|
|
}
|