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MIPS: use ioremap_page_range

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Use the generic ioremap_page_range helper instead of reimplementing it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Christoph Hellwig 2020-04-16 17:00:11 +02:00 committed by Thomas Bogendoerfer
parent d257b8fe17
commit c2591eb5da
1 changed files with 11 additions and 101 deletions
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112
arch/mips/mm/ioremap.c
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@ -14,99 +14,14 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm_types.h>
#include <linux/io.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <asm/tlbflush.h>
#include <ioremap.h>
#define IS_LOW512(addr) (!((phys_addr_t)(addr) & (phys_addr_t) ~0x1fffffffULL))
#define IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1)
static inline void remap_area_pte(pte_t * pte, unsigned long address,
phys_addr_t size, phys_addr_t phys_addr, unsigned long flags)
{
phys_addr_t end;
unsigned long pfn;
pgprot_t pgprot = __pgprot(_PAGE_GLOBAL | _PAGE_PRESENT | __READABLE
| __WRITEABLE | flags);
address &= ~PMD_MASK;
end = address + size;
if (end > PMD_SIZE)
end = PMD_SIZE;
BUG_ON(address >= end);
pfn = phys_addr >> PAGE_SHIFT;
do {
if (!pte_none(*pte)) {
printk("remap_area_pte: page already exists\n");
BUG();
}
set_pte(pte, pfn_pte(pfn, pgprot));
address += PAGE_SIZE;
pfn++;
pte++;
} while (address && (address < end));
}
static inline int remap_area_pmd(pmd_t * pmd, unsigned long address,
phys_addr_t size, phys_addr_t phys_addr, unsigned long flags)
{
phys_addr_t end;
address &= ~PGDIR_MASK;
end = address + size;
if (end > PGDIR_SIZE)
end = PGDIR_SIZE;
phys_addr -= address;
BUG_ON(address >= end);
do {
pte_t * pte = pte_alloc_kernel(pmd, address);
if (!pte)
return -ENOMEM;
remap_area_pte(pte, address, end - address, address + phys_addr, flags);
address = (address + PMD_SIZE) & PMD_MASK;
pmd++;
} while (address && (address < end));
return 0;
}
static int remap_area_pages(unsigned long address, phys_addr_t phys_addr,
phys_addr_t size, unsigned long flags)
{
int error;
pgd_t * dir;
unsigned long end = address + size;
phys_addr -= address;
dir = pgd_offset(&init_mm, address);
flush_cache_all();
BUG_ON(address >= end);
do {
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
error = -ENOMEM;
p4d = p4d_alloc(&init_mm, dir, address);
if (!p4d)
break;
pud = pud_alloc(&init_mm, p4d, address);
if (!pud)
break;
pmd = pmd_alloc(&init_mm, pud, address);
if (!pmd)
break;
if (remap_area_pmd(pmd, address, end - address,
phys_addr + address, flags))
break;
error = 0;
address = (address + PGDIR_SIZE) & PGDIR_MASK;
dir++;
} while (address && (address < end));
flush_tlb_all();
return error;
}
static int __ioremap_check_ram(unsigned long start_pfn, unsigned long nr_pages,
void *arg)
{
@ -135,7 +50,7 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, unsigned long size,
unsigned long offset, pfn, last_pfn;
struct vm_struct *area;
phys_addr_t last_addr;
void *addr;
unsigned long vaddr;
void __iomem *cpu_addr;
cpu_addr = plat_ioremap(phys_addr, size, flags);
@ -183,27 +98,22 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, unsigned long size,
area = get_vm_area(size, VM_IOREMAP);
if (!area)
return NULL;
addr = area->addr;
if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
vunmap(addr);
vaddr = (unsigned long)area->addr;
flags |= _PAGE_GLOBAL | _PAGE_PRESENT | __READABLE | __WRITEABLE;
if (ioremap_page_range(vaddr, vaddr + size, phys_addr,
__pgprot(flags))) {
free_vm_area(area);
return NULL;
}
return (void __iomem *) (offset + (char *)addr);
return (void __iomem *)(vaddr + offset);
}
EXPORT_SYMBOL(ioremap_prot);
void iounmap(const volatile void __iomem *addr)
{
struct vm_struct *p;
if (plat_iounmap(addr) || IS_KSEG1(addr))
return;
p = remove_vm_area((void *) (PAGE_MASK & (unsigned long __force) addr));
if (!p)
printk(KERN_ERR "iounmap: bad address %p\n", addr);
kfree(p);
if (!plat_iounmap(addr) && !IS_KSEG1(addr))
vunmap((void *)((unsigned long)addr & PAGE_MASK));
}
EXPORT_SYMBOL(iounmap);