/* * linux/arch/arm/mm/proc-mohawk.S: MMU functions for Marvell PJ1 core * * PJ1 (codename Mohawk) is a hybrid of the xscale3 and Marvell's own core. * * Heavily based on proc-arm926.S and proc-xsc3.S * * 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 flushed. If the * area is larger than this, then we flush the whole cache. */ #define CACHE_DLIMIT 32768 /* * The cache line size of the L1 D cache. */ #define CACHE_DLINESIZE 32 /* * cpu_mohawk_proc_init() */ ENTRY(cpu_mohawk_proc_init) mov pc, lr /* * cpu_mohawk_proc_fin() */ ENTRY(cpu_mohawk_proc_fin) 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 mov pc, lr /* * cpu_mohawk_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 * * (same as arm926) */ .align 5 ENTRY(cpu_mohawk_reset) mov ip, #0 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches mcr p15, 0, ip, c7, c10, 4 @ drain WB mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs mrc p15, 0, ip, c1, c0, 0 @ ctrl register bic ip, ip, #0x0007 @ .............cam bic ip, ip, #0x1100 @ ...i...s........ mcr p15, 0, ip, c1, c0, 0 @ ctrl register mov pc, r0 /* * cpu_mohawk_do_idle() * * Called with IRQs disabled */ .align 5 ENTRY(cpu_mohawk_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 mov pc, lr /* * flush_user_cache_all() * * Clean and invalidate all cache entries in a particular * address space. */ ENTRY(mohawk_flush_user_cache_all) /* FALLTHROUGH */ /* * flush_kern_cache_all() * * Clean and invalidate the entire cache. */ ENTRY(mohawk_flush_kern_cache_all) mov r2, #VM_EXEC mov ip, #0 __flush_whole_cache: mcr p15, 0, ip, c7, c14, 0 @ clean & invalidate all D cache tst r2, #VM_EXEC mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache mcrne p15, 0, ip, c7, c10, 0 @ drain write buffer mov pc, 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 * * (same as arm926) */ ENTRY(mohawk_flush_user_cache_range) mov ip, #0 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 mcrne p15, 0, ip, c7, c10, 4 @ drain WB mov pc, 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 */ ENTRY(mohawk_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 * * (same as arm926) */ ENTRY(mohawk_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 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(mohawk_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 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 * * (same as v4wb) */ mohawk_dma_inv_range: 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 bic r0, r0, #CACHE_DLINESIZE - 1 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 mov pc, lr /* * dma_clean_range(start, end) * * Clean the specified virtual address range. * * - start - virtual start address * - end - virtual end address * * (same as v4wb) */ mohawk_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 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(mohawk_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 mov pc, lr /* * dma_map_area(start, size, dir) * - start - kernel virtual start address * - size - size of region * - dir - DMA direction */ ENTRY(mohawk_dma_map_area) add r1, r1, r0 cmp r2, #DMA_TO_DEVICE beq mohawk_dma_clean_range bcs mohawk_dma_inv_range b mohawk_dma_flush_range ENDPROC(mohawk_dma_map_area) /* * dma_unmap_area(start, size, dir) * - start - kernel virtual start address * - size - size of region * - dir - DMA direction */ ENTRY(mohawk_dma_unmap_area) mov pc, lr ENDPROC(mohawk_dma_unmap_area) ENTRY(mohawk_cache_fns) .long mohawk_flush_kern_cache_all .long mohawk_flush_user_cache_all .long mohawk_flush_user_cache_range .long mohawk_coherent_kern_range .long mohawk_coherent_user_range .long mohawk_flush_kern_dcache_area .long mohawk_dma_map_area .long mohawk_dma_unmap_area .long mohawk_dma_flush_range ENTRY(cpu_mohawk_dcache_clean_area) 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry add r0, r0, #CACHE_DLINESIZE subs r1, r1, #CACHE_DLINESIZE bhi 1b mcr p15, 0, r0, c7, c10, 4 @ drain WB mov pc, lr /* * cpu_mohawk_switch_mm(pgd) * * Set the translation base pointer to be as described by pgd. * * pgd: new page tables */ .align 5 ENTRY(cpu_mohawk_switch_mm) mov ip, #0 mcr p15, 0, ip, c7, c14, 0 @ clean & invalidate all D cache mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache mcr p15, 0, ip, c7, c10, 4 @ drain WB 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 & D TLBs mov pc, lr /* * cpu_mohawk_set_pte_ext(ptep, pte, ext) * * Set a PTE and flush it out */ .align 5 ENTRY(cpu_mohawk_set_pte_ext) armv3_set_pte_ext mov r0, r0 mcr p15, 0, r0, c7, c10, 1 @ clean D entry mcr p15, 0, r0, c7, c10, 4 @ drain WB mov pc, lr __CPUINIT .type __mohawk_setup, #function __mohawk_setup: mov r0, #0 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches mcr p15, 0, r0, c7, c10, 4 @ drain write buffer mcr p15, 0, r0, c8, c7 @ invalidate I,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, #0 @ don't allow CP access mcr p15, 0, r0, c15, c1, 0 @ write CP access register adr r5, mohawk_crval ldmia r5, {r5, r6} mrc p15, 0, r0, c1, c0 @ get control register bic r0, r0, r5 orr r0, r0, r6 mov pc, lr .size __mohawk_setup, . - __mohawk_setup /* * R * .RVI ZFRS BLDP WCAM * .011 1001 ..00 0101 * */ .type mohawk_crval, #object mohawk_crval: crval clear=0x00007f3f, mmuset=0x00003905, ucset=0x00001134 __INITDATA /* * Purpose : Function pointers used to access above functions - all calls * come through these */ .type mohawk_processor_functions, #object mohawk_processor_functions: .word v5t_early_abort .word legacy_pabort .word cpu_mohawk_proc_init .word cpu_mohawk_proc_fin .word cpu_mohawk_reset .word cpu_mohawk_do_idle .word cpu_mohawk_dcache_clean_area .word cpu_mohawk_switch_mm .word cpu_mohawk_set_pte_ext .word 0 .word 0 .word 0 .size mohawk_processor_functions, . - mohawk_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_mohawk_name, #object cpu_mohawk_name: .asciz "Marvell 88SV331x" .size cpu_mohawk_name, . - cpu_mohawk_name .align .section ".proc.info.init", #alloc, #execinstr .type __88sv331x_proc_info,#object __88sv331x_proc_info: .long 0x56158000 @ Marvell 88SV331x (MOHAWK) .long 0xfffff000 .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 b __mohawk_setup .long cpu_arch_name .long cpu_elf_name .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP .long cpu_mohawk_name .long mohawk_processor_functions .long v4wbi_tlb_fns .long v4wb_user_fns .long mohawk_cache_fns .size __88sv331x_proc_info, . - __88sv331x_proc_info