Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*
 * 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];
 
inline 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));
 
 
}