209 lines
4.6 KiB
C
209 lines
4.6 KiB
C
/*
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* Virtual DMA allocation
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*
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* (C) 1999 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
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*
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* 11/26/2000 -- disabled the existing code because it didn't work for
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* me in 2.4. Replaced with a significantly more primitive version
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* similar to the sun3 code. the old functionality was probably more
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* desirable, but.... -- Sam Creasey (sammy@oh.verio.com)
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <asm/sun3x.h>
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#include <asm/dvma.h>
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#include <asm/io.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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/* IOMMU support */
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#define IOMMU_ADDR_MASK 0x03ffe000
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#define IOMMU_CACHE_INHIBIT 0x00000040
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#define IOMMU_FULL_BLOCK 0x00000020
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#define IOMMU_MODIFIED 0x00000010
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#define IOMMU_USED 0x00000008
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#define IOMMU_WRITE_PROTECT 0x00000004
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#define IOMMU_DT_MASK 0x00000003
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#define IOMMU_DT_INVALID 0x00000000
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#define IOMMU_DT_VALID 0x00000001
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#define IOMMU_DT_BAD 0x00000002
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static volatile unsigned long *iommu_pte = (unsigned long *)SUN3X_IOMMU;
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#define dvma_entry_paddr(index) (iommu_pte[index] & IOMMU_ADDR_MASK)
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#define dvma_entry_vaddr(index,paddr) ((index << DVMA_PAGE_SHIFT) | \
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(paddr & (DVMA_PAGE_SIZE-1)))
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#if 0
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#define dvma_entry_set(index,addr) (iommu_pte[index] = \
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(addr & IOMMU_ADDR_MASK) | \
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IOMMU_DT_VALID | IOMMU_CACHE_INHIBIT)
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#else
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#define dvma_entry_set(index,addr) (iommu_pte[index] = \
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(addr & IOMMU_ADDR_MASK) | \
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IOMMU_DT_VALID)
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#endif
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#define dvma_entry_clr(index) (iommu_pte[index] = IOMMU_DT_INVALID)
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#define dvma_entry_hash(addr) ((addr >> DVMA_PAGE_SHIFT) ^ \
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((addr & 0x03c00000) >> \
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(DVMA_PAGE_SHIFT+4)))
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#undef DEBUG
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#ifdef DEBUG
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/* code to print out a dvma mapping for debugging purposes */
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void dvma_print (unsigned long dvma_addr)
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{
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unsigned long index;
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index = dvma_addr >> DVMA_PAGE_SHIFT;
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printk("idx %lx dvma_addr %08lx paddr %08lx\n", index, dvma_addr,
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dvma_entry_paddr(index));
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}
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#endif
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/* create a virtual mapping for a page assigned within the IOMMU
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so that the cpu can reach it easily */
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inline int dvma_map_cpu(unsigned long kaddr,
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unsigned long vaddr, int len)
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{
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pgd_t *pgd;
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unsigned long end;
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int ret = 0;
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kaddr &= PAGE_MASK;
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vaddr &= PAGE_MASK;
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end = PAGE_ALIGN(vaddr + len);
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#ifdef DEBUG
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printk("dvma: mapping kern %08lx to virt %08lx\n",
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kaddr, vaddr);
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#endif
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pgd = pgd_offset_k(vaddr);
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do {
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pmd_t *pmd;
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unsigned long end2;
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if((pmd = pmd_alloc(&init_mm, pgd, vaddr)) == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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if((end & PGDIR_MASK) > (vaddr & PGDIR_MASK))
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end2 = (vaddr + (PGDIR_SIZE-1)) & PGDIR_MASK;
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else
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end2 = end;
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do {
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pte_t *pte;
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unsigned long end3;
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if((pte = pte_alloc_kernel(pmd, vaddr)) == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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if((end2 & PMD_MASK) > (vaddr & PMD_MASK))
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end3 = (vaddr + (PMD_SIZE-1)) & PMD_MASK;
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else
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end3 = end2;
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do {
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#ifdef DEBUG
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printk("mapping %08lx phys to %08lx\n",
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__pa(kaddr), vaddr);
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#endif
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set_pte(pte, pfn_pte(virt_to_pfn(kaddr),
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PAGE_KERNEL));
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pte++;
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kaddr += PAGE_SIZE;
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vaddr += PAGE_SIZE;
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} while(vaddr < end3);
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} while(vaddr < end2);
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} while(vaddr < end);
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flush_tlb_all();
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out:
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return ret;
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}
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inline int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
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int len)
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{
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unsigned long end, index;
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index = baddr >> DVMA_PAGE_SHIFT;
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end = ((baddr+len) >> DVMA_PAGE_SHIFT);
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if(len & ~DVMA_PAGE_MASK)
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end++;
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for(; index < end ; index++) {
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// if(dvma_entry_use(index))
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// BUG();
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// printk("mapping pa %lx to ba %lx\n", __pa(kaddr), index << DVMA_PAGE_SHIFT);
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dvma_entry_set(index, __pa(kaddr));
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iommu_pte[index] |= IOMMU_FULL_BLOCK;
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// dvma_entry_inc(index);
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kaddr += DVMA_PAGE_SIZE;
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}
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#ifdef DEBUG
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for(index = (baddr >> DVMA_PAGE_SHIFT); index < end; index++)
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dvma_print(index << DVMA_PAGE_SHIFT);
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#endif
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return 0;
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}
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void dvma_unmap_iommu(unsigned long baddr, int len)
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{
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int index, end;
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index = baddr >> DVMA_PAGE_SHIFT;
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end = (DVMA_PAGE_ALIGN(baddr+len) >> DVMA_PAGE_SHIFT);
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for(; index < end ; index++) {
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#ifdef DEBUG
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printk("freeing bus mapping %08x\n", index << DVMA_PAGE_SHIFT);
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#endif
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#if 0
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if(!dvma_entry_use(index))
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printk("dvma_unmap freeing unused entry %04x\n",
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index);
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else
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dvma_entry_dec(index);
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#endif
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dvma_entry_clr(index);
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}
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}
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