#include <config.h>
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#include <mpc86xx.h>
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#include <ppc_asm.tmpl>
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#include <ppc_defs.h>
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#include <asm/cache.h>
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#include <asm/mmu.h>
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#ifndef CACHE_LINE_SIZE
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# define CACHE_LINE_SIZE L1_CACHE_BYTES
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#endif
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#if CACHE_LINE_SIZE == 128
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#define LG_CACHE_LINE_SIZE 7
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#elif CACHE_LINE_SIZE == 32
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#define LG_CACHE_LINE_SIZE 5
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#elif CACHE_LINE_SIZE == 16
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#define LG_CACHE_LINE_SIZE 4
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#elif CACHE_LINE_SIZE == 8
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#define LG_CACHE_LINE_SIZE 3
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#else
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# error "Invalid cache line size!"
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#endif
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/*
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* Most of this code is taken from 74xx_7xx/cache.S
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* and then cleaned up a bit
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*/
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/*
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* Invalidate L1 instruction cache.
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*/
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_GLOBAL(invalidate_l1_instruction_cache)
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/* use invalidate-all bit in HID0 */
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mfspr r3,HID0
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ori r3,r3,HID0_ICFI
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mtspr HID0,r3
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isync
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blr
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/*
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* Invalidate L1 data cache.
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*/
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_GLOBAL(invalidate_l1_data_cache)
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mfspr r3,HID0
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ori r3,r3,HID0_DCFI
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mtspr HID0,r3
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isync
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blr
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/*
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* Flush data cache.
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*/
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_GLOBAL(flush_dcache)
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lis r3,0
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lis r5,CACHE_LINE_SIZE
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flush:
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cmp 0,1,r3,r5
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bge done
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lwz r5,0(r3)
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lis r5,CACHE_LINE_SIZE
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addi r3,r3,0x4
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b flush
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done:
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blr
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/*
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* Write any modified data cache blocks out to memory
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* and invalidate the corresponding instruction cache blocks.
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* This is a no-op on the 601.
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*
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* flush_icache_range(unsigned long start, unsigned long stop)
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*/
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_GLOBAL(flush_icache_range)
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li r5,CACHE_LINE_SIZE-1
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andc r3,r3,r5
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subf r4,r3,r4
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add r4,r4,r5
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srwi. r4,r4,LG_CACHE_LINE_SIZE
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beqlr
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mtctr r4
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mr r6,r3
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1: dcbst 0,r3
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addi r3,r3,CACHE_LINE_SIZE
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bdnz 1b
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sync /* wait for dcbst's to get to ram */
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mtctr r4
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2: icbi 0,r6
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addi r6,r6,CACHE_LINE_SIZE
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bdnz 2b
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sync /* additional sync needed on g4 */
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isync
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blr
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/*
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* Write any modified data cache blocks out to memory.
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* Does not invalidate the corresponding cache lines (especially for
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* any corresponding instruction cache).
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*
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* clean_dcache_range(unsigned long start, unsigned long stop)
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*/
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_GLOBAL(clean_dcache_range)
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li r5,CACHE_LINE_SIZE-1
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andc r3,r3,r5 /* align r3 down to cache line */
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subf r4,r3,r4 /* r4 = offset of stop from start of cache line */
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add r4,r4,r5 /* r4 += cache_line_size-1 */
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srwi. r4,r4,LG_CACHE_LINE_SIZE /* r4 = number of cache lines to flush */
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beqlr /* if r4 == 0 return */
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mtctr r4 /* ctr = r4 */
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sync
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1: dcbst 0,r3
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addi r3,r3,CACHE_LINE_SIZE
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bdnz 1b
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sync /* wait for dcbst's to get to ram */
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blr
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/*
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* Flush a particular page from the data cache to RAM.
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* Note: this is necessary because the instruction cache does *not*
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* snoop from the data cache.
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*
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* void __flush_page_to_ram(void *page)
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*/
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_GLOBAL(__flush_page_to_ram)
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rlwinm r3,r3,0,0,19 /* Get page base address */
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li r4,4096/CACHE_LINE_SIZE /* Number of lines in a page */
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mtctr r4
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mr r6,r3
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0: dcbst 0,r3 /* Write line to ram */
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addi r3,r3,CACHE_LINE_SIZE
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bdnz 0b
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sync
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mtctr r4
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1: icbi 0,r6
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addi r6,r6,CACHE_LINE_SIZE
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bdnz 1b
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sync
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isync
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blr
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/*
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* Flush a particular page from the instruction cache.
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* Note: this is necessary because the instruction cache does *not*
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* snoop from the data cache.
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*
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* void __flush_icache_page(void *page)
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*/
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_GLOBAL(__flush_icache_page)
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li r4,4096/CACHE_LINE_SIZE /* Number of lines in a page */
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mtctr r4
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1: icbi 0,r3
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addi r3,r3,CACHE_LINE_SIZE
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bdnz 1b
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sync
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isync
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blr
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/*
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* Clear a page using the dcbz instruction, which doesn't cause any
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* memory traffic (except to write out any cache lines which get
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* displaced). This only works on cacheable memory.
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*/
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_GLOBAL(clear_page)
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li r0,4096/CACHE_LINE_SIZE
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mtctr r0
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1: dcbz 0,r3
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addi r3,r3,CACHE_LINE_SIZE
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bdnz 1b
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blr
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/*
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* Enable L1 Instruction cache
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*/
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_GLOBAL(icache_enable)
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mfspr r3, HID0
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li r5, HID0_ICFI|HID0_ILOCK
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andc r3, r3, r5
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ori r3, r3, HID0_ICE
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ori r5, r3, HID0_ICFI
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mtspr HID0, r5
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mtspr HID0, r3
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isync
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blr
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/*
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* Disable L1 Instruction cache
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*/
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_GLOBAL(icache_disable)
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mflr r4
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bl invalidate_l1_instruction_cache /* uses r3 */
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sync
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mtlr r4
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mfspr r3, HID0
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li r5, 0
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ori r5, r5, HID0_ICE
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andc r3, r3, r5
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mtspr HID0, r3
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isync
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blr
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/*
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* Is instruction cache enabled?
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*/
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_GLOBAL(icache_status)
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mfspr r3, HID0
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andi. r3, r3, HID0_ICE
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blr
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_GLOBAL(l1dcache_enable)
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mfspr r3, HID0
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li r5, HID0_DCFI|HID0_DLOCK
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andc r3, r3, r5
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mtspr HID0, r3 /* no invalidate, unlock */
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ori r3, r3, HID0_DCE
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ori r5, r3, HID0_DCFI
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mtspr HID0, r5 /* enable + invalidate */
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mtspr HID0, r3 /* enable */
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sync
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blr
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/*
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* Enable data cache(s) - L1 and optionally L2
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* Calls l2cache_enable. LR saved in r5
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*/
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_GLOBAL(dcache_enable)
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mfspr r3, HID0
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li r5, HID0_DCFI|HID0_DLOCK
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andc r3, r3, r5
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mtspr HID0, r3 /* no invalidate, unlock */
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ori r3, r3, HID0_DCE
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ori r5, r3, HID0_DCFI
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mtspr HID0, r5 /* enable + invalidate */
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mtspr HID0, r3 /* enable */
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sync
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#ifdef CONFIG_SYS_L2
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mflr r5
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bl l2cache_enable /* uses r3 and r4 */
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sync
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mtlr r5
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#endif
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blr
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/*
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* Disable data cache(s) - L1 and optionally L2
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* Calls flush_dcache and l2cache_disable_no_flush.
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* LR saved in r4
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*/
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_GLOBAL(dcache_disable)
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mflr r4 /* save link register */
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bl flush_dcache /* uses r3 and r5 */
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sync
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mfspr r3, HID0
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li r5, HID0_DCFI|HID0_DLOCK
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andc r3, r3, r5
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mtspr HID0, r3 /* no invalidate, unlock */
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li r5, HID0_DCE|HID0_DCFI
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andc r3, r3, r5 /* no enable, no invalidate */
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mtspr HID0, r3
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sync
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#ifdef CONFIG_SYS_L2
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bl l2cache_disable_no_flush /* uses r3 */
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#endif
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mtlr r4 /* restore link register */
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blr
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/*
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* Is data cache enabled?
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*/
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_GLOBAL(dcache_status)
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mfspr r3, HID0
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andi. r3, r3, HID0_DCE
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blr
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/*
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* Invalidate L2 cache using L2I, assume L2 is enabled
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*/
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_GLOBAL(l2cache_invalidate)
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mfspr r3, l2cr
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rlwinm. r3, r3, 0, 0, 0
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beq 1f
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mfspr r3, l2cr
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rlwinm r3, r3, 0, 1, 31
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#ifdef CONFIG_ALTIVEC
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dssall
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#endif
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sync
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mtspr l2cr, r3
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sync
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1: mfspr r3, l2cr
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oris r3, r3, L2CR_L2I@h
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mtspr l2cr, r3
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invl2:
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mfspr r3, l2cr
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andis. r3, r3, L2CR_L2I@h
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bne invl2
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blr
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/*
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* Enable L2 cache
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* Calls l2cache_invalidate. LR is saved in r4
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*/
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_GLOBAL(l2cache_enable)
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mflr r4 /* save link register */
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bl l2cache_invalidate /* uses r3 */
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sync
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lis r3, L2_ENABLE@h
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ori r3, r3, L2_ENABLE@l
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mtspr l2cr, r3
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isync
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mtlr r4 /* restore link register */
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blr
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/*
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* Disable L2 cache
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* Calls flush_dcache. LR is saved in r4
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*/
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_GLOBAL(l2cache_disable)
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mflr r4 /* save link register */
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bl flush_dcache /* uses r3 and r5 */
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sync
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mtlr r4 /* restore link register */
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l2cache_disable_no_flush: /* provide way to disable L2 w/o flushing */
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lis r3, L2_INIT@h
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ori r3, r3, L2_INIT@l
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mtspr l2cr, r3
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isync
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blr
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