1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/m68k/sun3/dvma.c
5 * Written by Sam Creasey
7 * Sun3 IOMMU routines used for dvma accesses.
11 #include <linux/init.h>
12 #include <linux/kernel.h>
14 #include <linux/bootmem.h>
15 #include <linux/list.h>
17 #include <asm/pgtable.h>
18 #include <asm/sun3mmu.h>
22 static unsigned long ptelist
[120];
24 static unsigned long dvma_page(unsigned long kaddr
, unsigned long vaddr
)
30 j
= *(volatile unsigned long *)kaddr
;
31 *(volatile unsigned long *)kaddr
= j
;
33 ptep
= pfn_pte(virt_to_pfn(kaddr
), PAGE_KERNEL
);
35 // pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte);
36 if(ptelist
[(vaddr
& 0xff000) >> PAGE_SHIFT
] != pte
) {
37 sun3_put_pte(vaddr
, pte
);
38 ptelist
[(vaddr
& 0xff000) >> PAGE_SHIFT
] = pte
;
41 return (vaddr
+ (kaddr
& ~PAGE_MASK
));
45 int dvma_map_iommu(unsigned long kaddr
, unsigned long baddr
,
52 vaddr
= dvma_btov(baddr
);
57 dvma_page(kaddr
, vaddr
);
66 void __init
sun3_dvma_init(void)
68 memset(ptelist
, 0, sizeof(ptelist
));