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authorWu Zhangjin <wuzhangjin@gmail.com>2009-11-11 13:59:23 +0800
committerRalf Baechle <ralf@linux-mips.org>2009-12-17 01:57:15 +0000
commit22f1fdfd62a5f6ab738ffe03dc2ee9f1f25dabc4 (patch)
treedbfd9b7b9b1a25f31cfb0af42becdb33e7418b4d /arch
parent55045ff5557bc804752e84dca5d1b1f1d4bb4e31 (diff)
downloadlwn-22f1fdfd62a5f6ab738ffe03dc2ee9f1f25dabc4.tar.gz
lwn-22f1fdfd62a5f6ab738ffe03dc2ee9f1f25dabc4.zip
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')
-rw-r--r--arch/mips/Kconfig3
-rw-r--r--arch/mips/include/asm/pgtable.h13
-rw-r--r--arch/mips/loongson/common/mem.c58
3 files changed, 74 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 51e4e5b02f9d..e2116b1f968e 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -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
diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index d6eb6134abec..1854336e56a2 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -390,6 +390,19 @@ 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.
*/
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 <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 */