/* * linux/arch/arm/mm/proc-xsc3.S * * Original Author: Matthew Gilbert * Current Maintainer: Lennert Buytenhek * * Copyright 2004 (C) Intel Corp. * Copyright 2005 (C) MontaVista Software, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * MMU functions for the Intel XScale3 Core (XSC3). The XSC3 core is * an extension to Intel's original XScale core that adds the following * features: * * - ARMv6 Supersections * - Low Locality Reference pages (replaces mini-cache) * - 36-bit addressing * - L2 cache * - Cache coherency if chipset supports it * * Based on original XScale code by Nicolas Pitre. */ #include #include #include #include #include #include #include #include #include #include "proc-macros.S" /* * This is the maximum size of an area which will be flushed. If the * area is larger than this, then we flush the whole cache. */ #define MAX_AREA_SIZE 32768 /* * The cache line size of the L1 I, L1 D and unified L2 cache. */ #define CACHELINESIZE 32 /* * The size of the L1 D cache. */ #define CACHESIZE 32768 /* * This macro is used to wait for a CP15 write and is needed when we * have to ensure that the last operation to the coprocessor was * completed before continuing with operation. */ .macro cpwait_ret, lr, rd mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15 sub pc, \lr, \rd, LSR #32 @ wait for completion and @ flush instruction pipeline .endm /* * This macro cleans and invalidates the entire L1 D cache. */ .macro clean_d_cache rd, rs mov \rd, #0x1f00 orr \rd, \rd, #0x00e0 1: mcr p15, 0, \rd, c7, c14, 2 @ clean/invalidate L1 D line adds \rd, \rd, #0x40000000 bcc 1b subs \rd, \rd, #0x20 bpl 1b .endm .text /* * cpu_xsc3_proc_init() * * Nothing too exciting at the moment */ ENTRY(cpu_xsc3_proc_init) mov pc, lr /* * cpu_xsc3_proc_fin() */ ENTRY(cpu_xsc3_proc_fin) str lr, [sp, #-4]! mov r0, #PSR_F_BIT|PSR_I_BIT|SVC_MODE msr cpsr_c, r0 bl xsc3_flush_kern_cache_all @ clean caches mrc p15, 0, r0, c1, c0, 0 @ ctrl register bic r0, r0, #0x1800 @ ...IZ........... bic r0, r0, #0x0006 @ .............CA. mcr p15, 0, r0, c1, c0, 0 @ disable caches ldr pc, [sp], #4 /* * cpu_xsc3_reset(loc) * * Perform a soft reset of the system. Put the CPU into the * same state as it would be if it had been reset, and branch * to what would be the reset vector. * * loc: location to jump to for soft reset */ .align 5 ENTRY(cpu_xsc3_reset) mov r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE msr cpsr_c, r1 @ reset CPSR mrc p15, 0, r1, c1, c0, 0 @ ctrl register bic r1, r1, #0x3900 @ ..VIZ..S........ bic r1, r1, #0x0086 @ ........B....CA. mcr p15, 0, r1, c1, c0, 0 @ ctrl register mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB bic r1, r1, #0x0001 @ ...............M mcr p15, 0, r1, c1, c0, 0 @ ctrl register @ CAUTION: MMU turned off from this point. We count on the pipeline @ already containing those two last instructions to survive. mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs mov pc, r0 /* * cpu_xsc3_do_idle() * * Cause the processor to idle * * For now we do nothing but go to idle mode for every case * * XScale supports clock switching, but using idle mode support * allows external hardware to react to system state changes. */ .align 5 ENTRY(cpu_xsc3_do_idle) mov r0, #1 mcr p14, 0, r0, c7, c0, 0 @ go to idle mov pc, lr /* ================================= CACHE ================================ */ /* * flush_user_cache_all() * * Invalidate all cache entries in a particular address * space. */ ENTRY(xsc3_flush_user_cache_all) /* FALLTHROUGH */ /* * flush_kern_cache_all() * * Clean and invalidate the entire cache. */ ENTRY(xsc3_flush_kern_cache_all) mov r2, #VM_EXEC mov ip, #0 __flush_whole_cache: clean_d_cache r0, r1 tst r2, #VM_EXEC mcrne p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB mcrne p15, 0, ip, c7, c10, 4 @ data write barrier mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush mov pc, lr /* * flush_user_cache_range(start, end, vm_flags) * * Invalidate a range of cache entries in the specified * address space. * * - start - start address (may not be aligned) * - end - end address (exclusive, may not be aligned) * - vma - vma_area_struct describing address space */ .align 5 ENTRY(xsc3_flush_user_cache_range) mov ip, #0 sub r3, r1, r0 @ calculate total size cmp r3, #MAX_AREA_SIZE bhs __flush_whole_cache 1: tst r2, #VM_EXEC mcrne p15, 0, r0, c7, c5, 1 @ invalidate L1 I line mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line add r0, r0, #CACHELINESIZE cmp r0, r1 blo 1b tst r2, #VM_EXEC mcrne p15, 0, ip, c7, c5, 6 @ invalidate BTB mcrne p15, 0, ip, c7, c10, 4 @ data write barrier mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush mov pc, lr /* * coherent_kern_range(start, end) * * Ensure coherency between the I cache and the D cache in the * region described by start. If you have non-snooping * Harvard caches, you need to implement this function. * * - start - virtual start address * - end - virtual end address * * Note: single I-cache line invalidation isn't used here since * it also trashes the mini I-cache used by JTAG debuggers. */ ENTRY(xsc3_coherent_kern_range) /* FALLTHROUGH */ ENTRY(xsc3_coherent_user_range) bic r0, r0, #CACHELINESIZE - 1 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line add r0, r0, #CACHELINESIZE cmp r0, r1 blo 1b mov r0, #0 mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB mcr p15, 0, r0, c7, c10, 4 @ data write barrier mcr p15, 0, r0, c7, c5, 4 @ prefetch flush mov pc, lr /* * flush_kern_dcache_area(void *addr, size_t size) * * Ensure no D cache aliasing occurs, either with itself or * the I cache. * * - addr - kernel address * - size - region size */ ENTRY(xsc3_flush_kern_dcache_area) add r1, r0, r1 1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line add r0, r0, #CACHELINESIZE cmp r0, r1 blo 1b mov r0, #0 mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB mcr p15, 0, r0, c7, c10, 4 @ data write barrier mcr p15, 0, r0, c7, c5, 4 @ prefetch flush mov pc, lr /* * dma_inv_range(start, end) * * Invalidate (discard) the specified virtual address range. * May not write back any entries. If 'start' or 'end' * are not cache line aligned, those lines must be written * back. * * - start - virtual start address * - end - virtual end address */ ENTRY(xsc3_dma_inv_range) tst r0, #CACHELINESIZE - 1 bic r0, r0, #CACHELINESIZE - 1 mcrne p15, 0, r0, c7, c10, 1 @ clean L1 D line tst r1, #CACHELINESIZE - 1 mcrne p15, 0, r1, c7, c10, 1 @ clean L1 D line 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate L1 D line add r0, r0, #CACHELINESIZE cmp r0, r1 blo 1b mcr p15, 0, r0, c7, c10, 4 @ data write barrier mov pc, lr /* * dma_clean_range(start, end) * * Clean the specified virtual address range. * * - start - virtual start address * - end - virtual end address */ ENTRY(xsc3_dma_clean_range) bic r0, r0, #CACHELINESIZE - 1 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line add r0, r0, #CACHELINESIZE cmp r0, r1 blo 1b mcr p15, 0, r0, c7, c10, 4 @ data write barrier mov pc, lr /* * dma_flush_range(start, end) * * Clean and invalidate the specified virtual address range. * * - start - virtual start address * - end - virtual end address */ ENTRY(xsc3_dma_flush_range) bic r0, r0, #CACHELINESIZE - 1 1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line add r0, r0, #CACHELINESIZE cmp r0, r1 blo 1b mcr p15, 0, r0, c7, c10, 4 @ data write barrier mov pc, lr ENTRY(xsc3_cache_fns) .long xsc3_flush_kern_cache_all .long xsc3_flush_user_cache_all .long xsc3_flush_user_cache_range .long xsc3_coherent_kern_range .long xsc3_coherent_user_range .long xsc3_flush_kern_dcache_area .long xsc3_dma_inv_range .long xsc3_dma_clean_range .long xsc3_dma_flush_range ENTRY(cpu_xsc3_dcache_clean_area) 1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line add r0, r0, #CACHELINESIZE subs r1, r1, #CACHELINESIZE bhi 1b mov pc, lr /* =============================== PageTable ============================== */ /* * cpu_xsc3_switch_mm(pgd) * * Set the translation base pointer to be as described by pgd. * * pgd: new page tables */ .align 5 ENTRY(cpu_xsc3_switch_mm) clean_d_cache r1, r2 mcr p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB mcr p15, 0, ip, c7, c10, 4 @ data write barrier mcr p15, 0, ip, c7, c5, 4 @ prefetch flush orr r0, r0, #0x18 @ cache the page table in L2 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs cpwait_ret lr, ip /* * cpu_xsc3_set_pte_ext(ptep, pte, ext) * * Set a PTE and flush it out */ cpu_xsc3_mt_table: .long 0x00 @ L_PTE_MT_UNCACHED .long PTE_EXT_TEX(1) @ L_PTE_MT_BUFFERABLE .long PTE_EXT_TEX(5) | PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK .long PTE_EXT_TEX(1) | PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED .long 0x00 @ unused .long 0x00 @ L_PTE_MT_MINICACHE (not present) .long PTE_EXT_TEX(5) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC (not present?) .long 0x00 @ unused .long PTE_EXT_TEX(1) @ L_PTE_MT_DEV_WC .long 0x00 @ unused .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED .long PTE_EXT_TEX(2) @ L_PTE_MT_DEV_NONSHARED .long 0x00 @ unused .long 0x00 @ unused .long 0x00 @ unused .align 5 ENTRY(cpu_xsc3_set_pte_ext) xscale_set_pte_ext_prologue tst r1, #L_PTE_SHARED @ shared? and r1, r1, #L_PTE_MT_MASK adr ip, cpu_xsc3_mt_table ldr ip, [ip, r1] orrne r2, r2, #PTE_EXT_COHERENT @ interlock: mask in coherent bit bic r2, r2, #0x0c @ clear old C,B bits orr r2, r2, ip xscale_set_pte_ext_epilogue mov pc, lr .ltorg .align __INIT .type __xsc3_setup, #function __xsc3_setup: mov r0, #PSR_F_BIT|PSR_I_BIT|SVC_MODE msr cpsr_c, r0 mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB mcr p15, 0, ip, c7, c10, 4 @ data write barrier mcr p15, 0, ip, c7, c5, 4 @ prefetch flush mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs orr r4, r4, #0x18 @ cache the page table in L2 mcr p15, 0, r4, c2, c0, 0 @ load page table pointer mov r0, #1 << 6 @ cp6 access for early sched_clock mcr p15, 0, r0, c15, c1, 0 @ write CP access register mrc p15, 0, r0, c1, c0, 1 @ get auxiliary control reg and r0, r0, #2 @ preserve bit P bit setting orr r0, r0, #(1 << 10) @ enable L2 for LLR cache mcr p15, 0, r0, c1, c0, 1 @ set auxiliary control reg adr r5, xsc3_crval ldmia r5, {r5, r6} mrc p15, 0, r0, c1, c0, 0 @ get control register bic r0, r0, r5 @ ..V. ..R. .... ..A. orr r0, r0, r6 @ ..VI Z..S .... .C.M (mmu) @ ...I Z..S .... .... (uc) mov pc, lr .size __xsc3_setup, . - __xsc3_setup .type xsc3_crval, #object xsc3_crval: crval clear=0x04002202, mmuset=0x00003905, ucset=0x00001900 __INITDATA /* * Purpose : Function pointers used to access above functions - all calls * come through these */ .type xsc3_processor_functions, #object ENTRY(xsc3_processor_functions) .word v5t_early_abort .word legacy_pabort .word cpu_xsc3_proc_init .word cpu_xsc3_proc_fin .word cpu_xsc3_reset .word cpu_xsc3_do_idle .word cpu_xsc3_dcache_clean_area .word cpu_xsc3_switch_mm .word cpu_xsc3_set_pte_ext .size xsc3_processor_functions, . - xsc3_processor_functions .section ".rodata" .type cpu_arch_name, #object cpu_arch_name: .asciz "armv5te" .size cpu_arch_name, . - cpu_arch_name .type cpu_elf_name, #object cpu_elf_name: .asciz "v5" .size cpu_elf_name, . - cpu_elf_name .type cpu_xsc3_name, #object cpu_xsc3_name: .asciz "XScale-V3 based processor" .size cpu_xsc3_name, . - cpu_xsc3_name .align .section ".proc.info.init", #alloc, #execinstr .type __xsc3_proc_info,#object __xsc3_proc_info: .long 0x69056000 .long 0xffffe000 .long PMD_TYPE_SECT | \ PMD_SECT_BUFFERABLE | \ PMD_SECT_CACHEABLE | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ .long PMD_TYPE_SECT | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ b __xsc3_setup .long cpu_arch_name .long cpu_elf_name .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP .long cpu_xsc3_name .long xsc3_processor_functions .long v4wbi_tlb_fns .long xsc3_mc_user_fns .long xsc3_cache_fns .size __xsc3_proc_info, . - __xsc3_proc_info /* Note: PXA935 changed its implementor ID from Intel to Marvell */ .type __xsc3_pxa935_proc_info,#object __xsc3_pxa935_proc_info: .long 0x56056000 .long 0xffffe000 .long PMD_TYPE_SECT | \ PMD_SECT_BUFFERABLE | \ PMD_SECT_CACHEABLE | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ .long PMD_TYPE_SECT | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ b __xsc3_setup .long cpu_arch_name .long cpu_elf_name .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP .long cpu_xsc3_name .long xsc3_processor_functions .long v4wbi_tlb_fns .long xsc3_mc_user_fns .long xsc3_cache_fns .size __xsc3_pxa935_proc_info, . - __xsc3_pxa935_proc_info