[Qemu-ppc] [PATCH v3 4/6] PPC: 85xx: Generalize DDR TLB mapping function

[Alexander Graf]

The DDR mapping function really is just a generic virtual -> physical
mapping function. Generalize it so it can support any virtual starting
offset and IO maps just the same.

Signed-off-by: Alexander Graf <address@hidden>
---
 arch/powerpc/cpu/mpc85xx/tlb.c |   48 ++++++++++++++++++++++++++--------------
 arch/powerpc/include/asm/mmu.h |    3 +++
 2 files changed, 34 insertions(+), 17 deletions(-)

diff --git a/arch/powerpc/cpu/mpc85xx/tlb.c b/arch/powerpc/cpu/mpc85xx/tlb.c
index 8748ecd..2011fb8 100644
--- a/arch/powerpc/cpu/mpc85xx/tlb.c
+++ b/arch/powerpc/cpu/mpc85xx/tlb.c
@@ -236,20 +236,26 @@ void init_addr_map(void)
 }
 #endif
 
-unsigned int
-setup_ddr_tlbs_phys(phys_addr_t p_addr, unsigned int memsize_in_meg)
+void
+tlb_map_range(ulong v_addr, phys_addr_t p_addr, uint64_t size, bool is_ram)
 {
        int i;
        unsigned int tlb_size;
-       unsigned int wimge = MAS2_M;
-       unsigned int ram_tlb_address = (unsigned int)CONFIG_SYS_DDR_SDRAM_BASE;
+       unsigned int wimge;
+       unsigned int perm;
        unsigned int max_cam, tsize_mask;
-       u64 size, memsize = (u64)memsize_in_meg << 20;
 
+       if (is_ram) {
+               perm = MAS3_SX|MAS3_SW|MAS3_SR;
+               wimge = MAS2_M;
 #ifdef CONFIG_SYS_PPC_DDR_WIMGE
-       wimge = CONFIG_SYS_PPC_DDR_WIMGE;
+               wimge = CONFIG_SYS_PPC_DDR_WIMGE;
 #endif
-       size = min(memsize, CONFIG_MAX_MEM_MAPPED);
+       } else {
+               perm = MAS3_SW|MAS3_SR;
+               wimge = MAS2_I|MAS2_G;
+       }
+
        if ((mfspr(SPRN_MMUCFG) & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
                /* Convert (4^max) kB to (2^max) bytes */
                max_cam = ((mfspr(SPRN_TLB1CFG) >> 16) & 0xf) * 2 + 10;
@@ -261,11 +267,11 @@ setup_ddr_tlbs_phys(phys_addr_t p_addr, unsigned int 
memsize_in_meg)
        }
 
        for (i = 0; size && i < 8; i++) {
-               int ram_tlb_index = find_free_tlbcam();
+               int tlb_index = find_free_tlbcam();
                u32 camsize = __ilog2_u64(size) & tsize_mask;
-               u32 align = __ilog2(ram_tlb_address) & tsize_mask;
+               u32 align = __ilog2(v_addr) & tsize_mask;
 
-               if (ram_tlb_index == -1)
+               if (tlb_index == -1)
                        break;
 
                if (align == -2) align = max_cam;
@@ -277,18 +283,26 @@ setup_ddr_tlbs_phys(phys_addr_t p_addr, unsigned int 
memsize_in_meg)
 
                tlb_size = camsize - 10;
 
-               set_tlb(1, ram_tlb_address, p_addr,
-                       MAS3_SX|MAS3_SW|MAS3_SR, wimge,
-                       0, ram_tlb_index, tlb_size, 1);
+               set_tlb(1, v_addr, p_addr, perm, wimge,
+                       0, tlb_index, tlb_size, 1);
 
                size -= 1ULL << camsize;
-               memsize -= 1ULL << camsize;
-               ram_tlb_address += 1UL << camsize;
+               v_addr += 1UL << camsize;
                p_addr += 1UL << camsize;
        }
 
-       if (memsize)
-               print_size(memsize, " left unmapped\n");
+       if (size)
+               print_size(size, " left unmapped\n");
+}
+
+unsigned int
+setup_ddr_tlbs_phys(phys_addr_t p_addr, unsigned int memsize_in_meg)
+{
+       unsigned int ram_tlb_address = (unsigned int)CONFIG_SYS_DDR_SDRAM_BASE;
+       u64 memsize = (u64)memsize_in_meg << 20;
+
+       memsize = min(memsize, CONFIG_MAX_MEM_MAPPED);
+       tlb_map_range(ram_tlb_address, p_addr, memsize, true);
        return memsize_in_meg;
 }
 
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index cadaeef..5493c51 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -509,6 +509,9 @@ extern void print_tlbcam(void);
 extern unsigned int setup_ddr_tlbs(unsigned int memsize_in_meg);
 extern void clear_ddr_tlbs(unsigned int memsize_in_meg);
 
+extern void tlb_map_range(ulong v_addr, phys_addr_t p_addr, uint64_t size,
+                         bool is_ram);
+
 extern void write_tlb(u32 _mas0, u32 _mas1, u32 _mas2, u32 _mas3, u32 _mas7);
 
 #define SET_TLB_ENTRY(_tlb, _epn, _rpn, _perms, _wimge, _ts, _esel, _sz, 
_iprot) \
-- 
1.7.10.4