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[PATCH 21/30] loongson: define Loongson2F arch specific phys prot access

To: linux-mips@linux-mips.org, Ralf Baechle <ralf@linux-mips.org>
Subject: [PATCH 21/30] loongson: define Loongson2F arch specific phys prot access
From: Wu Zhangjin <wuzhangjin@gmail.com>
Date: Sat, 16 May 2009 06:20:18 +0800
Cc: Arnaud Patard <apatard@mandriva.com>, loongson-dev@googlegroups.com, zhangfx@lemote.com, yanh@lemote.com, Philippe Vachon <philippe@cowpig.ca>, Zhang Le <r0bertz@gentoo.org>, Erwan Lerale <erwan@thiscow.com>
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>From 6eba97d7176eace554caddcc40c7e9719354fc62 Mon Sep 17 00:00:00 2001
From: Wu Zhangjin <wuzhangjin@gmail.com>
Date: Sat, 16 May 2009 04:34:23 +0800
Subject: [PATCH 21/30] loongson: define Loongson2F arch specific phys
prot access

The main purpose is to uncache accelerate for video memory access
---
 arch/mips/include/asm/pgtable.h |   13 +++++++++
 arch/mips/loongson/Kconfig      |   12 ++++++++
 arch/mips/loongson/common/mem.c |   56
+++++++++++++++++++++++++++++++++++++++
 3 files changed, 81 insertions(+), 0 deletions(-)

diff --git a/arch/mips/include/asm/pgtable.h
b/arch/mips/include/asm/pgtable.h
index 6a0edf7..3954da0 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -370,6 +370,19 @@ static inline int io_remap_pfn_range(struct
vm_area_struct *vma,
 #include <asm-generic/pgtable.h>
 
 /*
+ * uncache accelerate for video memory access
+ */
+#ifdef CONFIG_LOONGSON2F
+#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/Kconfig b/arch/mips/loongson/Kconfig
index 2622017..49cb375 100644
--- a/arch/mips/loongson/Kconfig
+++ b/arch/mips/loongson/Kconfig
@@ -99,3 +99,15 @@ config CS5536
 
 config SYS_HAS_MACH_PROM_INIT_CMDLINE
        bool
+
+config UCA_SIZE
+       hex "Uncache Accelerated Region size"
+       depends on LOONGSON2F 
+       default 0x400000 if LEMOTE_YEELOONG2F
+       default 0x2000000 if LEMOTE_FULOONG2F
+       help
+         Uncached Acceleration(UCA) can greatly improve video performance.
+         Normally the Video memory can be accessed in Uncached Accelerated
mode,
+         other peripheral spaces not.
+         
+         Specify a zeroed size to disable this feature. 
diff --git a/arch/mips/loongson/common/mem.c
b/arch/mips/loongson/common/mem.c
index 059d43f..4e1bf29 100644
--- a/arch/mips/loongson/common/mem.c
+++ b/arch/mips/loongson/common/mem.c
@@ -53,3 +53,59 @@ int __uncached_access(struct file *file, unsigned
long addr)
        return addr >= __pa(high_memory) ||
                ((addr >= LOONGSON_MMIO_MEM_START) && (addr <
LOONGSON_MMIO_MEM_END));
 }
+
+#if defined(CONFIG_CPU_LOONGSON2F)
+
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <asm/current.h>
+
+static unsigned long uca_start;
+static unsigned long uca_size = CONFIG_UCA_SIZE;
+
+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_start + 
uca_size))
+                       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;
+                                       printk("find the frame 
buffer:start=%lx\n", uca_start);
+                                       return 0;
+                               }
+                       }
+
+               }
+       }
+       return 0;
+}
+
+late_initcall(find_vga_mem_init);
+#endif /* !CONFIG_CPU_LOONGSON2F */
-- 
1.6.2.1




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