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FSL DDR: Add e500 TLB helper for DDR code

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Provide a helper function that board code can call to map TLBs when
setting up DDR.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Kumar Gala 2008-06-09 11:07:46 -05:00
parent b5710d9974
commit 6fb1b73468
2 changed files with 65 additions and 0 deletions
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64
cpu/mpc85xx/tlb.c
View File

@ -90,3 +90,67 @@ void init_tlbs(void)
return ;
}
unsigned int setup_ddr_tlbs(unsigned int memsize_in_meg)
{
unsigned int tlb_size;
unsigned int ram_tlb_index;
unsigned int ram_tlb_address;
/*
* Determine size of each TLB1 entry.
*/
switch (memsize_in_meg) {
case 16:
case 32:
tlb_size = BOOKE_PAGESZ_16M;
break;
case 64:
case 128:
tlb_size = BOOKE_PAGESZ_64M;
break;
case 256:
case 512:
tlb_size = BOOKE_PAGESZ_256M;
break;
case 1024:
case 2048:
if (PVR_VER(get_pvr()) > PVR_VER(PVR_85xx))
tlb_size = BOOKE_PAGESZ_1G;
else
tlb_size = BOOKE_PAGESZ_256M;
break;
default:
puts("DDR: only 16M, 32M, 64M, 128M, 256M, 512M, 1G"
" and 2G are supported.\n");
/*
* The memory was not able to be mapped.
* Default to a small size.
*/
tlb_size = BOOKE_PAGESZ_64M;
memsize_in_meg = 64;
break;
}
/*
* Configure DDR TLB1 entries.
* Starting at TLB1 8, use no more than 8 TLB1 entries.
*/
ram_tlb_index = 8;
ram_tlb_address = (unsigned int)CFG_DDR_SDRAM_BASE;
while (ram_tlb_address < (memsize_in_meg * 1024 * 1024)
&& ram_tlb_index < 16) {
set_tlb(1, ram_tlb_address, ram_tlb_address,
MAS3_SX|MAS3_SW|MAS3_SR, 0,
0, ram_tlb_index, tlb_size, 1);
ram_tlb_address += (0x1000 << ((tlb_size - 1) * 2));
ram_tlb_index++;
}
/*
* Confirm that the requested amount of memory was mapped.
*/
return memsize_in_meg;
}

1
include/asm-ppc/mmu.h
View File

@ -431,6 +431,7 @@ extern void set_tlb(u8 tlb, u32 epn, u64 rpn,
extern void disable_tlb(u8 esel);
extern void invalidate_tlb(u8 tlb);
extern void init_tlbs(void);
extern unsigned int setup_ddr_tlbs(unsigned int memsize_in_meg);
#define SET_TLB_ENTRY(_tlb, _epn, _rpn, _perms, _wimge, _ts, _esel, _sz, _iprot) \
{ .tlb = _tlb, .epn = _epn, .rpn = _rpn, .perms = _perms, \