linux-stable/arch/m68k/sun3/dvma.c
Adrian Bunk 07b8125949 m68k/sun3/: possible cleanups
This patch contains the following possible cleanups:
- make the following needlessly global code static:
  - config.c: sun3_bootmem_alloc()
  - config.c: sun3_sched_init()
  - dvma.c: dvma_page()
  - idprom.c: struct Sun_Machines[]
  - mmu_emu.c: struct ctx_alloc[]
  - sun3dvma.c: iommu_use[]
  - sun3ints.c: led_pattern[]
- remove the unused sbus.c

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-20 17:24:39 -07:00

71 lines
1.2 KiB
C

/*
* 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));
}