From 22f1fdfd62a5f6ab738ffe03dc2ee9f1f25dabc4 Mon Sep 17 00:00:00 2001 From: Wu Zhangjin Date: Wed, 11 Nov 2009 13:59:23 +0800 Subject: MIPS: Add support for uncached accelerated mappings. Loongson2f support video acceleration. Signed-off-by: Wu Zhangjin 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 --- arch/mips/loongson/common/mem.c | 58 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) (limited to 'arch/mips/loongson/common') diff --git a/arch/mips/loongson/common/mem.c b/arch/mips/loongson/common/mem.c index 981e9190f393..ceacd092b446 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 +#include +#include + +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 */ -- cgit v1.2.3