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sun3kmap.c

/*
 * linux/arch/m68k/mm/sun3kmap.c
 *
 * Copyright (C) 2002 Sam Creasey <sammy@sammy.net>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/sun3mmu.h>

#undef SUN3_KMAP_DEBUG

#ifdef SUN3_KMAP_DEBUG
extern void print_pte_vaddr(unsigned long vaddr);
#endif

extern void mmu_emu_map_pmeg (int context, int vaddr);

static inline void do_page_mapin(unsigned long phys, unsigned long virt,
                         unsigned long type)
{
      unsigned long pte;
      pte_t ptep;

      ptep = pfn_pte(phys >> PAGE_SHIFT, PAGE_KERNEL);
      pte = pte_val(ptep);
      pte |= type;

      sun3_put_pte(virt, pte);

#ifdef SUN3_KMAP_DEBUG
      print_pte_vaddr(virt);
#endif

}

static inline void do_pmeg_mapin(unsigned long phys, unsigned long virt,
                         unsigned long type, int pages)
{

      if(sun3_get_segmap(virt & ~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG)
            mmu_emu_map_pmeg(sun3_get_context(), virt);

      while(pages) {
            do_page_mapin(phys, virt, type);
            phys += PAGE_SIZE;
            virt += PAGE_SIZE;
            pages--;
      }
}

void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
               unsigned long type)
{
      struct vm_struct *area;
      unsigned long offset, virt, ret;
      int pages;

      if(!size)
            return NULL;

      /* page align */
      offset = phys & (PAGE_SIZE-1);
      phys &= ~(PAGE_SIZE-1);

      size += offset;
      size = PAGE_ALIGN(size);
      if((area = get_vm_area(size, VM_IOREMAP)) == NULL)
            return NULL;

#ifdef SUN3_KMAP_DEBUG
      printk("ioremap: got virt %p size %lx(%lx)\n",
             area->addr, size, area->size);
#endif

      pages = size / PAGE_SIZE;
      virt = (unsigned long)area->addr;
      ret = virt + offset;

      while(pages) {
            int seg_pages;

            seg_pages = (SUN3_PMEG_SIZE - (virt & SUN3_PMEG_MASK)) / PAGE_SIZE;
            if(seg_pages > pages)
                  seg_pages = pages;

            do_pmeg_mapin(phys, virt, type, seg_pages);

            pages -= seg_pages;
            phys += seg_pages * PAGE_SIZE;
            virt += seg_pages * PAGE_SIZE;
      }

      return (void __iomem *)ret;

}
EXPORT_SYMBOL(sun3_ioremap);


void __iomem *__ioremap(unsigned long phys, unsigned long size, int cache)
{

      return sun3_ioremap(phys, size, SUN3_PAGE_TYPE_IO);

}
EXPORT_SYMBOL(__ioremap);

void iounmap(void __iomem *addr)
{
      vfree((void *)(PAGE_MASK & (unsigned long)addr));
}
EXPORT_SYMBOL(iounmap);

/* sun3_map_test(addr, val) -- Reads a byte from addr, storing to val,
 * trapping the potential read fault.  Returns 0 if the access faulted,
 * 1 on success.
 *
 * This function is primarily used to check addresses on the VME bus.
 *
 * Mucking with the page fault handler seems a little hackish to me, but
 * SunOS, NetBSD, and Mach all implemented this check in such a manner,
 * so I figure we're allowed.
 */
int sun3_map_test(unsigned long addr, char *val)
{
      int ret = 0;

      __asm__ __volatile__
            (".globl _sun3_map_test_start\n"
             "_sun3_map_test_start:\n"
             "1: moveb (%2), (%0)\n"
             "   moveq #1, %1\n"
             "2:\n"
             ".section .fixup,\"ax\"\n"
             ".even\n"
             "3: moveq #0, %1\n"
             "   jmp 2b\n"
             ".previous\n"
             ".section __ex_table,\"a\"\n"
             ".align 4\n"
             ".long 1b,3b\n"
             ".previous\n"
             ".globl _sun3_map_test_end\n"
             "_sun3_map_test_end:\n"
             : "=a"(val), "=r"(ret)
             : "a"(addr));

      return ret;
}
EXPORT_SYMBOL(sun3_map_test);

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