/* * linux/arch/arm/mm/proc-feroceon.S: MMU functions for Feroceon * * Heavily based on proc-arm926.S * Maintainer: Assaf Hoffman * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include "proc-macros.S" /* * This is the maximum size of an area which will be invalidated * using the single invalidate entry instructions. Anything larger * than this, and we go for the whole cache. * * This value should be chosen such that we choose the cheapest * alternative. */ #define CACHE_DLIMIT 16384 /* * the cache line size of the I and D cache */ #define CACHE_DLINESIZE 32 .bss .align 3 __cache_params_loc: .space 8 .text __cache_params: .word __cache_params_loc /* * cpu_feroceon_proc_init() */ ENTRY(cpu_feroceon_proc_init) mrc p15, 0, r0, c0, c0, 1 @ read cache type register ldr r1, __cache_params mov r2, #(16 << 5) tst r0, #(1 << 16) @ get way mov r0, r0, lsr #18 @ get cache size order movne r3, #((4 - 1) << 30) @ 4-way and r0, r0, #0xf moveq r3, #0 @ 1-way mov r2, r2, lsl r0 @ actual cache size movne r2, r2, lsr #2 @ turned into # of sets sub r2, r2, #(1 << 5) stmia r1, {r2, r3} ret lr /* * cpu_feroceon_proc_fin() */ ENTRY(cpu_feroceon_proc_fin) #if defined(CONFIG_CACHE_FEROCEON_L2) && \ !defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH) mov r0, #0 mcr p15, 1, r0, c15, c9, 0 @ clean L2 mcr p15, 0, r0, c7, c10, 4 @ drain WB #endif mrc p15, 0, r0, c1, c0, 0 @ ctrl register bic r0, r0, #0x1000 @ ...i............ bic r0, r0, #0x000e @ ............wca. mcr p15, 0, r0, c1, c0, 0 @ disable caches ret lr /* * cpu_feroceon_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 .pushsection .idmap.text, "ax" ENTRY(cpu_feroceon_reset) mov ip, #0 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches mcr p15, 0, ip, c7, c10, 4 @ drain WB #ifdef CONFIG_MMU mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs #endif mrc p15, 0, ip, c1, c0, 0 @ ctrl register bic ip, ip, #0x000f @ ............wcam bic ip, ip, #0x1100 @ ...i...s........ mcr p15, 0, ip, c1, c0, 0 @ ctrl register ret r0 ENDPROC(cpu_feroceon_reset) .popsection /* * cpu_feroceon_do_idle() * * Called with IRQs disabled */ .align 5 ENTRY(cpu_feroceon_do_idle) mov r0, #0 mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt ret lr /* * flush_icache_all() * * Unconditionally clean and invalidate the entire icache. */ ENTRY(feroceon_flush_icache_all) mov r0, #0 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache ret lr ENDPROC(feroceon_flush_icache_all) /* * flush_user_cache_all() * * Clean and invalidate all cache entries in a particular * address space. */ .align 5 ENTRY(feroceon_flush_user_cache_all) /* FALLTHROUGH */ /* * flush_kern_cache_all() * * Clean and invalidate the entire cache. */ ENTRY(feroceon_flush_kern_cache_all) mov r2, #VM_EXEC __flush_whole_cache: ldr r1, __cache_params ldmia r1, {r1, r3} 1: orr ip, r1, r3 2: mcr p15, 0, ip, c7, c14, 2 @ clean + invalidate D set/way subs ip, ip, #(1 << 30) @ next way bcs 2b subs r1, r1, #(1 << 5) @ next set bcs 1b tst r2, #VM_EXEC mov ip, #0 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache mcrne p15, 0, ip, c7, c10, 4 @ drain WB ret lr /* * flush_user_cache_range(start, end, flags) * * Clean and invalidate a range of cache entries in the * specified address range. * * - start - start address (inclusive) * - end - end address (exclusive) * - flags - vm_flags describing address space */ .align 5 ENTRY(feroceon_flush_user_cache_range) sub r3, r1, r0 @ calculate total size cmp r3, #CACHE_DLIMIT bgt __flush_whole_cache 1: tst r2, #VM_EXEC mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry add r0, r0, #CACHE_DLINESIZE mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry add r0, r0, #CACHE_DLINESIZE cmp r0, r1 blo 1b tst r2, #VM_EXEC mov ip, #0 mcrne p15, 0, ip, c7, c10, 4 @ drain WB ret lr /* * coherent_kern_range(start, end) * * Ensure coherency between the Icache and the Dcache in the * region described by start, end. If you have non-snooping * Harvard caches, you need to implement this function. * * - start - virtual start address * - end - virtual end address */ .align 5 ENTRY(feroceon_coherent_kern_range) /* FALLTHROUGH */ /* * coherent_user_range(start, end) * * Ensure coherency between the Icache and the Dcache in the * region described by start, end. If you have non-snooping * Harvard caches, you need to implement this function. * * - start - virtual start address * - end - virtual end address */ ENTRY(feroceon_coherent_user_range) bic r0, r0, #CACHE_DLINESIZE - 1 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry add r0, r0, #CACHE_DLINESIZE cmp r0, r1 blo 1b mcr p15, 0, r0, c7, c10, 4 @ drain WB mov r0, #0 ret 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 */ .align 5 ENTRY(feroceon_flush_kern_dcache_area) add r1, r0, r1 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry add r0, r0, #CACHE_DLINESIZE cmp r0, r1 blo 1b mov r0, #0 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache mcr p15, 0, r0, c7, c10, 4 @ drain WB ret lr .align 5 ENTRY(feroceon_range_flush_kern_dcache_area) mrs r2, cpsr add r1, r0, #PAGE_SZ - CACHE_DLINESIZE @ top addr is inclusive orr r3, r2, #PSR_I_BIT msr cpsr_c, r3 @ disable interrupts mcr p15, 5, r0, c15, c15, 0 @ D clean/inv range start mcr p15, 5, r1, c15, c15, 1 @ D clean/inv range top msr cpsr_c, r2 @ restore interrupts mov r0, #0 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache mcr p15, 0, r0, c7, c10, 4 @ drain WB ret 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 * * (same as v4wb) */ .align 5 feroceon_dma_inv_range: tst r0, #CACHE_DLINESIZE - 1 bic r0, r0, #CACHE_DLINESIZE - 1 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry tst r1, #CACHE_DLINESIZE - 1 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry add r0, r0, #CACHE_DLINESIZE cmp r0, r1 blo 1b mcr p15, 0, r0, c7, c10, 4 @ drain WB ret lr .align 5 feroceon_range_dma_inv_range: mrs r2, cpsr tst r0, #CACHE_DLINESIZE - 1 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry tst r1, #CACHE_DLINESIZE - 1 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry cmp r1, r0 subne r1, r1, #1 @ top address is inclusive orr r3, r2, #PSR_I_BIT msr cpsr_c, r3 @ disable interrupts mcr p15, 5, r0, c15, c14, 0 @ D inv range start mcr p15, 5, r1, c15, c14, 1 @ D inv range top msr cpsr_c, r2 @ restore interrupts ret lr /* * dma_clean_range(start, end) * * Clean the specified virtual address range. * * - start - virtual start address * - end - virtual end address * * (same as v4wb) */ .align 5 feroceon_dma_clean_range: bic r0, r0, #CACHE_DLINESIZE - 1 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry add r0, r0, #CACHE_DLINESIZE cmp r0, r1 blo 1b mcr p15, 0, r0, c7, c10, 4 @ drain WB ret lr .align 5 feroceon_range_dma_clean_range: mrs r2, cpsr cmp r1, r0 subne r1, r1, #1 @ top address is inclusive orr r3, r2, #PSR_I_BIT msr cpsr_c, r3 @ disable interrupts mcr p15, 5, r0, c15, c13, 0 @ D clean range start mcr p15, 5, r1, c15, c13, 1 @ D clean range top msr cpsr_c, r2 @ restore interrupts mcr p15, 0, r0, c7, c10, 4 @ drain WB ret lr /* * dma_flush_range(start, end) * * Clean and invalidate the specified virtual address range. * * - start - virtual start address * - end - virtual end address */ .align 5 ENTRY(feroceon_dma_flush_range) bic r0, r0, #CACHE_DLINESIZE - 1 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry add r0, r0, #CACHE_DLINESIZE cmp r0, r1 blo 1b mcr p15, 0, r0, c7, c10, 4 @ drain WB ret lr .align 5 ENTRY(feroceon_range_dma_flush_range) mrs r2, cpsr cmp r1, r0 subne r1, r1, #1 @ top address is inclusive orr r3, r2, #PSR_I_BIT msr cpsr_c, r3 @ disable interrupts mcr p15, 5, r0, c15, c15, 0 @ D clean/inv range start mcr p15, 5, r1, c15, c15, 1 @ D clean/inv range top msr cpsr_c, r2 @ restore interrupts mcr p15, 0, r0, c7, c10, 4 @ drain WB ret lr /* * dma_map_area(start, size, dir) * - start - kernel virtual start address * - size - size of region * - dir - DMA direction */ ENTRY(feroceon_dma_map_area) add r1, r1, r0 cmp r2, #DMA_TO_DEVICE beq feroceon_dma_clean_range bcs feroceon_dma_inv_range b feroceon_dma_flush_range ENDPROC(feroceon_dma_map_area) /* * dma_map_area(start, size, dir) * - start - kernel virtual start address * - size - size of region * - dir - DMA direction */ ENTRY(feroceon_range_dma_map_area) add r1, r1, r0 cmp r2, #DMA_TO_DEVICE beq feroceon_range_dma_clean_range bcs feroceon_range_dma_inv_range b feroceon_range_dma_flush_range ENDPROC(feroceon_range_dma_map_area) /* * dma_unmap_area(start, size, dir) * - start - kernel virtual start address * - size - size of region * - dir - DMA direction */ ENTRY(feroceon_dma_unmap_area) ret lr ENDPROC(feroceon_dma_unmap_area) .globl feroceon_flush_kern_cache_louis .equ feroceon_flush_kern_cache_louis, feroceon_flush_kern_cache_all @ define struct cpu_cache_fns (see and proc-macros.S) define_cache_functions feroceon .macro range_alias basename .globl feroceon_range_\basename .type feroceon_range_\basename , %function .equ feroceon_range_\basename , feroceon_\basename .endm /* * Most of the cache functions are unchanged for this case. * Export suitable alias symbols for the unchanged functions: */ range_alias flush_icache_all range_alias flush_user_cache_all range_alias flush_kern_cache_all range_alias flush_kern_cache_louis range_alias flush_user_cache_range range_alias coherent_kern_range range_alias coherent_user_range range_alias dma_unmap_area define_cache_functions feroceon_range .align 5 ENTRY(cpu_feroceon_dcache_clean_area) #if defined(CONFIG_CACHE_FEROCEON_L2) && \ !defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH) mov r2, r0 mov r3, r1 #endif 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry add r0, r0, #CACHE_DLINESIZE subs r1, r1, #CACHE_DLINESIZE bhi 1b #if defined(CONFIG_CACHE_FEROCEON_L2) && \ !defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH) 1: mcr p15, 1, r2, c15, c9, 1 @ clean L2 entry add r2, r2, #CACHE_DLINESIZE subs r3, r3, #CACHE_DLINESIZE bhi 1b #endif mcr p15, 0, r0, c7, c10, 4 @ drain WB ret lr /* =============================== PageTable ============================== */ /* * cpu_feroceon_switch_mm(pgd) * * Set the translation base pointer to be as described by pgd. * * pgd: new page tables */ .align 5 ENTRY(cpu_feroceon_switch_mm) #ifdef CONFIG_MMU /* * Note: we wish to call __flush_whole_cache but we need to preserve * lr to do so. The only way without touching main memory is to * use r2 which is normally used to test the VM_EXEC flag, and * compensate locally for the skipped ops if it is not set. */ mov r2, lr @ abuse r2 to preserve lr bl __flush_whole_cache @ if r2 contains the VM_EXEC bit then the next 2 ops are done already tst r2, #VM_EXEC mcreq p15, 0, ip, c7, c5, 0 @ invalidate I cache mcreq p15, 0, ip, c7, c10, 4 @ drain WB mcr p15, 0, r0, c2, c0, 0 @ load page table pointer mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs ret r2 #else ret lr #endif /* * cpu_feroceon_set_pte_ext(ptep, pte, ext) * * Set a PTE and flush it out */ .align 5 ENTRY(cpu_feroceon_set_pte_ext) #ifdef CONFIG_MMU armv3_set_pte_ext wc_disable=0 mov r0, r0 mcr p15, 0, r0, c7, c10, 1 @ clean D entry #if defined(CONFIG_CACHE_FEROCEON_L2) && \ !defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH) mcr p15, 1, r0, c15, c9, 1 @ clean L2 entry #endif mcr p15, 0, r0, c7, c10, 4 @ drain WB #endif ret lr /* Suspend/resume support: taken from arch/arm/mm/proc-arm926.S */ .globl cpu_feroceon_suspend_size .equ cpu_feroceon_suspend_size, 4 * 3 #ifdef CONFIG_ARM_CPU_SUSPEND ENTRY(cpu_feroceon_do_suspend) stmfd sp!, {r4 - r6, lr} mrc p15, 0, r4, c13, c0, 0 @ PID mrc p15, 0, r5, c3, c0, 0 @ Domain ID mrc p15, 0, r6, c1, c0, 0 @ Control register stmia r0, {r4 - r6} ldmfd sp!, {r4 - r6, pc} ENDPROC(cpu_feroceon_do_suspend) ENTRY(cpu_feroceon_do_resume) mov ip, #0 mcr p15, 0, ip, c8, c7, 0 @ invalidate I+D TLBs mcr p15, 0, ip, c7, c7, 0 @ invalidate I+D caches ldmia r0, {r4 - r6} mcr p15, 0, r4, c13, c0, 0 @ PID mcr p15, 0, r5, c3, c0, 0 @ Domain ID mcr p15, 0, r1, c2, c0, 0 @ TTB address mov r0, r6 @ control register b cpu_resume_mmu ENDPROC(cpu_feroceon_do_resume) #endif .type __feroceon_setup, #function __feroceon_setup: mov r0, #0 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 #ifdef CONFIG_MMU mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 #endif adr r5, feroceon_crval ldmia r5, {r5, r6} mrc p15, 0, r0, c1, c0 @ get control register v4 bic r0, r0, r5 orr r0, r0, r6 ret lr .size __feroceon_setup, . - __feroceon_setup /* * B * R P * .RVI UFRS BLDP WCAM * .011 .001 ..11 0101 * */ .type feroceon_crval, #object feroceon_crval: crval clear=0x0000773f, mmuset=0x00003135, ucset=0x00001134 __INITDATA @ define struct processor (see and proc-macros.S) define_processor_functions feroceon, dabort=v5t_early_abort, pabort=legacy_pabort .section ".rodata" string cpu_arch_name, "armv5te" string cpu_elf_name, "v5" string cpu_feroceon_name, "Feroceon" string cpu_88fr531_name, "Feroceon 88FR531-vd" string cpu_88fr571_name, "Feroceon 88FR571-vd" string cpu_88fr131_name, "Feroceon 88FR131" .align .section ".proc.info.init", #alloc .macro feroceon_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req, cache:req .type __\name\()_proc_info,#object __\name\()_proc_info: .long \cpu_val .long \cpu_mask .long PMD_TYPE_SECT | \ PMD_SECT_BUFFERABLE | \ PMD_SECT_CACHEABLE | \ PMD_BIT4 | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ .long PMD_TYPE_SECT | \ PMD_BIT4 | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ initfn __feroceon_setup, __\name\()_proc_info .long cpu_arch_name .long cpu_elf_name .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP .long \cpu_name .long feroceon_processor_functions .long v4wbi_tlb_fns .long feroceon_user_fns .long \cache .size __\name\()_proc_info, . - __\name\()_proc_info .endm #ifdef CONFIG_CPU_FEROCEON_OLD_ID feroceon_proc_info feroceon_old_id, 0x41009260, 0xff00fff0, \ cpu_name=cpu_feroceon_name, cache=feroceon_cache_fns #endif feroceon_proc_info 88fr531, 0x56055310, 0xfffffff0, cpu_88fr531_name, \ cache=feroceon_cache_fns feroceon_proc_info 88fr571, 0x56155710, 0xfffffff0, cpu_88fr571_name, \ cache=feroceon_range_cache_fns feroceon_proc_info 88fr131, 0x56251310, 0xfffffff0, cpu_88fr131_name, \ cache=feroceon_range_cache_fns