ppc4xx: Add remove_tlb() function to remove a mem area from TLB setup
The new function remove_tlb() can be used to remove the TLB's used to map a specific memory region. This is especially useful for the DDR(2) setup routines which configure the SDRAM area temporarily as a cached area (for speedup on auto-calibration and ECC generation) and later need this area uncached for normal usage. Signed-off-by: Stefan Roese <sr@denx.de>
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@ -25,7 +25,6 @@
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#if defined(CONFIG_440)
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#include <ppc4xx.h>
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#include <ppc440.h>
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#include <asm/io.h>
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#include <asm/mmu.h>
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@ -36,6 +35,67 @@ typedef struct region {
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unsigned long tlb_word2_i_value;
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} region_t;
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void remove_tlb(u32 vaddr, u32 size)
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{
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int i;
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u32 tlb_word0_value;
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u32 tlb_vaddr;
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u32 tlb_size = 0;
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/* First, find the index of a TLB entry not being used */
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for (i=0; i<PPC4XX_TLB_SIZE; i++) {
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tlb_word0_value = mftlb1(i);
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tlb_vaddr = TLB_WORD0_EPN_DECODE(tlb_word0_value);
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if (((tlb_word0_value & TLB_WORD0_V_MASK) == TLB_WORD0_V_ENABLE) &&
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(tlb_vaddr >= vaddr)) {
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/*
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* TLB is enabled and start address is lower or equal
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* than the area we are looking for. Now we only have
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* to check the size/end address for a match.
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*/
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switch (tlb_word0_value & TLB_WORD0_SIZE_MASK) {
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case TLB_WORD0_SIZE_1KB:
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tlb_size = 1 << 10;
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break;
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case TLB_WORD0_SIZE_4KB:
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tlb_size = 4 << 10;
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break;
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case TLB_WORD0_SIZE_16KB:
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tlb_size = 16 << 10;
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break;
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case TLB_WORD0_SIZE_64KB:
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tlb_size = 64 << 10;
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break;
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case TLB_WORD0_SIZE_256KB:
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tlb_size = 256 << 10;
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break;
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case TLB_WORD0_SIZE_1MB:
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tlb_size = 1 << 20;
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break;
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case TLB_WORD0_SIZE_16MB:
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tlb_size = 16 << 20;
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break;
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case TLB_WORD0_SIZE_256MB:
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tlb_size = 256 << 20;
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break;
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}
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/*
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* Now check the end-address if it's in the range
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*/
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if ((tlb_vaddr + tlb_size - 1) <= (vaddr + size - 1))
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/*
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* Found a TLB in the range.
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* Disable it by writing 0 to tlb0 word.
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*/
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mttlb1(i, 0);
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}
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}
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/* Execute an ISYNC instruction so that the new TLB entry takes effect */
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asm("isync");
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}
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static int add_tlb_entry(unsigned long phys_addr,
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unsigned long virt_addr,
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unsigned long tlb_word0_size_value,
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@ -645,6 +645,9 @@ void mttlb3(unsigned long index, unsigned long value);
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unsigned long mftlb1(unsigned long index);
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unsigned long mftlb2(unsigned long index);
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unsigned long mftlb3(unsigned long index);
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void program_tlb(u32 phys_addr, u32 virt_addr, u32 size, u32 tlb_word2_i_value);
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void remove_tlb(u32 vaddr, u32 size);
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_440 */
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