diff options
| author | Wu Zhangjin <wuzhangjin@gmail.com> | 2009-11-11 13:59:23 +0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2009-12-17 01:57:15 +0000 |
| commit | 22f1fdfd62a5f6ab738ffe03dc2ee9f1f25dabc4 (patch) | |
| tree | dbfd9b7b9b1a25f31cfb0af42becdb33e7418b4d /arch/mips/loongson | |
| parent | 55045ff5557bc804752e84dca5d1b1f1d4bb4e31 (diff) | |
| download | kernel_samsung_smdk4412-22f1fdfd62a5f6ab738ffe03dc2ee9f1f25dabc4.zip kernel_samsung_smdk4412-22f1fdfd62a5f6ab738ffe03dc2ee9f1f25dabc4.tar.gz kernel_samsung_smdk4412-22f1fdfd62a5f6ab738ffe03dc2ee9f1f25dabc4.tar.bz2 | |
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>
Diffstat (limited to 'arch/mips/loongson')
| -rw-r--r-- | arch/mips/loongson/common/mem.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/mips/loongson/common/mem.c b/arch/mips/loongson/common/mem.c index 981e919..ceacd09 100644 --- a/arch/mips/loongson/common/mem.c +++ b/arch/mips/loongson/common/mem.c @@ -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 */ |