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MIPS: Add support for uncached accelerated mappings. 

Loongson2f support video acceleration.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/624/
Patchwork: http://patchwork.linux-mips.org/patch/625/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Wu Zhangjin 2009-11-11 13:59:23 +08:00 committed by Ralf Baechle
parent 55045ff555
commit 22f1fdfd62
3 changed files with 74 additions and 0 deletions
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3
arch/mips/Kconfig
View File

@ -1336,6 +1336,7 @@ config SYS_HAS_CPU_LOONGSON2F
bool
select CPU_SUPPORTS_CPUFREQ
select CPU_SUPPORTS_ADDRWINCFG if 64BIT
select CPU_SUPPORTS_UNCACHED_ACCELERATED
config SYS_HAS_CPU_MIPS32_R1
bool
@ -1451,6 +1452,8 @@ config CPU_SUPPORTS_ADDRWINCFG
bool
config CPU_SUPPORTS_HUGEPAGES
bool
config CPU_SUPPORTS_UNCACHED_ACCELERATED
bool
config MIPS_PGD_C0_CONTEXT
bool
default y if 64BIT && CPU_MIPSR2

13
arch/mips/include/asm/pgtable.h
View File

@ -389,6 +389,19 @@ static inline int io_remap_pfn_range(struct vm_area_struct *vma,
#include <asm-generic/pgtable.h>
/*
* uncached accelerated TLB map for video memory access
*/
#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
#define __HAVE_PHYS_MEM_ACCESS_PROT
struct file;
pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t vma_prot);
int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t *vma_prot);
#endif
/*
* We provide our own get_unmapped area to cope with the virtual aliasing
* constraints placed on us by the cache architecture.

58
arch/mips/loongson/common/mem.c
View File

@ -58,3 +58,61 @@ int __uncached_access(struct file *file, unsigned long addr)
((addr >= LOONGSON_MMIO_MEM_START) &&
(addr < LOONGSON_MMIO_MEM_END));
}
#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
#include <linux/pci.h>
#include <linux/sched.h>
#include <asm/current.h>
static unsigned long uca_start, uca_end;
pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t vma_prot)
{
unsigned long offset = pfn << PAGE_SHIFT;
unsigned long end = offset + size;
if (__uncached_access(file, offset)) {
if (((uca_start && offset) >= uca_start) &&
(end <= uca_end))
return __pgprot((pgprot_val(vma_prot) &
~_CACHE_MASK) |
_CACHE_UNCACHED_ACCELERATED);
else
return pgprot_noncached(vma_prot);
}
return vma_prot;
}
static int __init find_vga_mem_init(void)
{
struct pci_dev *dev = 0;
struct resource *r;
int idx;
if (uca_start)
return 0;
for_each_pci_dev(dev) {
if ((dev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
r = &dev->resource[idx];
if (!r->start && r->end)
continue;
if (r->flags & IORESOURCE_IO)
continue;
if (r->flags & IORESOURCE_MEM) {
uca_start = r->start;
uca_end = r->end;
return 0;
}
}
}
}
return 0;
}
late_initcall(find_vga_mem_init);
#endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */