[POWERPC] Abolish iopa(), mm_ptov(), io_block_mapping() from arch/powerpc
These old-fashioned IO mapping functions no longer have any callers in code which remains relevant on arch/powerpc. Therefore, this removes them from arch/powerpc. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
David Gibson
Paul Mackerras
Родитель
4db68bfe71
Коммит
90ac19a8b2
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@ -303,48 +303,6 @@ void __init mapin_ram(void)
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/* is x a power of 4? */
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#define is_power_of_4(x) is_power_of_2(x) && (ffs(x) & 1)
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/*
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* Set up a mapping for a block of I/O.
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* virt, phys, size must all be page-aligned.
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* This should only be called before ioremap is called.
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*/
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void __init io_block_mapping(unsigned long virt, phys_addr_t phys,
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unsigned int size, int flags)
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{
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int i;
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if (virt > KERNELBASE && virt < ioremap_bot)
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ioremap_bot = ioremap_base = virt;
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#ifdef HAVE_BATS
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/*
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* Use a BAT for this if possible...
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*/
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if (io_bat_index < 2 && is_power_of_2(size)
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&& (virt & (size - 1)) == 0 && (phys & (size - 1)) == 0) {
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setbat(io_bat_index, virt, phys, size, flags);
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++io_bat_index;
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return;
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}
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#endif /* HAVE_BATS */
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#ifdef HAVE_TLBCAM
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/*
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* Use a CAM for this if possible...
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*/
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if (tlbcam_index < num_tlbcam_entries && is_power_of_4(size)
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&& (virt & (size - 1)) == 0 && (phys & (size - 1)) == 0) {
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settlbcam(tlbcam_index, virt, phys, size, flags, 0);
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++tlbcam_index;
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return;
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}
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#endif /* HAVE_TLBCAM */
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/* No BATs available, put it in the page tables. */
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for (i = 0; i < size; i += PAGE_SIZE)
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map_page(virt + i, phys + i, flags);
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}
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/* Scan the real Linux page tables and return a PTE pointer for
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* a virtual address in a context.
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* Returns true (1) if PTE was found, zero otherwise. The pointer to
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@ -379,82 +337,6 @@ get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp)
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return(retval);
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}
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/* Find physical address for this virtual address. Normally used by
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* I/O functions, but anyone can call it.
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*/
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unsigned long iopa(unsigned long addr)
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{
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unsigned long pa;
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/* I don't know why this won't work on PMacs or CHRP. It
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* appears there is some bug, or there is some implicit
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* mapping done not properly represented by BATs or in page
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* tables.......I am actively working on resolving this, but
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* can't hold up other stuff. -- Dan
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*/
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pte_t *pte;
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struct mm_struct *mm;
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/* Check the BATs */
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pa = v_mapped_by_bats(addr);
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if (pa)
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return pa;
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/* Allow mapping of user addresses (within the thread)
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* for DMA if necessary.
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*/
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if (addr < TASK_SIZE)
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mm = current->mm;
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else
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mm = &init_mm;
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pa = 0;
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if (get_pteptr(mm, addr, &pte, NULL)) {
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pa = (pte_val(*pte) & PAGE_MASK) | (addr & ~PAGE_MASK);
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pte_unmap(pte);
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}
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return(pa);
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}
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/* This is will find the virtual address for a physical one....
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* Swiped from APUS, could be dangerous :-).
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* This is only a placeholder until I really find a way to make this
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* work. -- Dan
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*/
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unsigned long
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mm_ptov (unsigned long paddr)
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{
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unsigned long ret;
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#if 0
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if (paddr < 16*1024*1024)
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ret = ZTWO_VADDR(paddr);
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else {
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int i;
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for (i = 0; i < kmap_chunk_count;){
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unsigned long phys = kmap_chunks[i++];
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unsigned long size = kmap_chunks[i++];
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unsigned long virt = kmap_chunks[i++];
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if (paddr >= phys
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&& paddr < (phys + size)){
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ret = virt + paddr - phys;
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goto exit;
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}
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}
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ret = (unsigned long) __va(paddr);
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}
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exit:
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#ifdef DEBUGPV
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printk ("PTOV(%lx)=%lx\n", paddr, ret);
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#endif
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#else
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ret = (unsigned long)paddr + KERNELBASE;
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#endif
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return ret;
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}
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#ifdef CONFIG_DEBUG_PAGEALLOC
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static int __change_page_attr(struct page *page, pgprot_t prot)
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@ -633,13 +633,6 @@ extern void __iomem * __ioremap_at(phys_addr_t pa, void *ea,
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unsigned long size, unsigned long flags);
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extern void __iounmap_at(void *ea, unsigned long size);
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/* Those are more 32 bits only functions */
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extern unsigned long iopa(unsigned long addr);
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extern unsigned long mm_ptov(unsigned long addr) __attribute_const__;
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extern void io_block_mapping(unsigned long virt, phys_addr_t phys,
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unsigned int size, int flags);
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/*
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* When CONFIG_PPC_INDIRECT_IO is set, we use the generic iomap implementation
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* which needs some additional definitions here. They basically allow PIO
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@ -756,8 +756,6 @@ extern void paging_init(void);
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extern void cache_clear(__u32 addr, int length);
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extern void cache_push(__u32 addr, int length);
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extern int mm_end_of_chunk (unsigned long addr, int len);
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extern unsigned long iopa(unsigned long addr);
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extern unsigned long mm_ptov(unsigned long addr) __attribute_const__;
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/* Values for nocacheflag and cmode */
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/* These are not used by the APUS kernel_map, but prevents
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