| /* |
| * linux/arch/arm/mm/arm925.S: MMU functions for ARM925 |
| * |
| * Copyright (C) 1999,2000 ARM Limited |
| * Copyright (C) 2000 Deep Blue Solutions Ltd. |
| * Copyright (C) 2002 RidgeRun, Inc. |
| * Copyright (C) 2002-2003 MontaVista Software, Inc. |
| * |
| * Update for Linux-2.6 and cache flush improvements |
| * Copyright (C) 2004 Nokia Corporation by Tony Lindgren <tony@atomide.com> |
| * |
| * hacked for non-paged-MM by Hyok S. Choi, 2004. |
| * |
| * 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 |
| * |
| * |
| * These are the low level assembler for performing cache and TLB |
| * functions on the arm925. |
| * |
| * CONFIG_CPU_ARM925_CPU_IDLE -> nohlt |
| * |
| * Some additional notes based on deciphering the TI TRM on OMAP-5910: |
| * |
| * NOTE1: The TI925T Configuration Register bit "D-cache clean and flush |
| * entry mode" must be 0 to flush the entries in both segments |
| * at once. This is the default value. See TRM 2-20 and 2-24 for |
| * more information. |
| * |
| * NOTE2: Default is the "D-cache clean and flush entry mode". It looks |
| * like the "Transparent mode" must be on for partial cache flushes |
| * to work in this mode. This mode only works with 16-bit external |
| * memory. See TRM 2-24 for more information. |
| * |
| * NOTE3: Write-back cache flushing seems to be flakey with devices using |
| * direct memory access, such as USB OHCI. The workaround is to use |
| * write-through cache with CONFIG_CPU_DCACHE_WRITETHROUGH (this is |
| * the default for OMAP-1510). |
| */ |
| |
| #include <linux/linkage.h> |
| #include <linux/config.h> |
| #include <linux/init.h> |
| #include <asm/assembler.h> |
| #include <asm/pgtable-hwdef.h> |
| #include <asm/pgtable.h> |
| #include <asm/procinfo.h> |
| #include <asm/page.h> |
| #include <asm/ptrace.h> |
| #include "proc-macros.S" |
| |
| /* |
| * The size of one data cache line. |
| */ |
| #define CACHE_DLINESIZE 16 |
| |
| /* |
| * The number of data cache segments. |
| */ |
| #define CACHE_DSEGMENTS 2 |
| |
| /* |
| * The number of lines in a cache segment. |
| */ |
| #define CACHE_DENTRIES 256 |
| |
| /* |
| * This is the size at which it becomes more efficient to |
| * clean the whole cache, rather than using the individual |
| * cache line maintainence instructions. |
| */ |
| #define CACHE_DLIMIT 8192 |
| |
| .text |
| /* |
| * cpu_arm925_proc_init() |
| */ |
| ENTRY(cpu_arm925_proc_init) |
| mov pc, lr |
| |
| /* |
| * cpu_arm925_proc_fin() |
| */ |
| ENTRY(cpu_arm925_proc_fin) |
| stmfd sp!, {lr} |
| mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE |
| msr cpsr_c, ip |
| bl arm925_flush_kern_cache_all |
| 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 |
| ldmfd sp!, {pc} |
| |
| /* |
| * cpu_arm925_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_arm925_reset) |
| /* Send software reset to MPU and DSP */ |
| mov ip, #0xff000000 |
| orr ip, ip, #0x00fe0000 |
| orr ip, ip, #0x0000ce00 |
| mov r4, #1 |
| strh r4, [ip, #0x10] |
| |
| 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 |
| mov pc, r0 |
| |
| /* |
| * cpu_arm925_do_idle() |
| * |
| * Called with IRQs disabled |
| */ |
| .align 10 |
| ENTRY(cpu_arm925_do_idle) |
| mov r0, #0 |
| mrc p15, 0, r1, c1, c0, 0 @ Read control register |
| mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer |
| bic r2, r1, #1 << 12 |
| mcr p15, 0, r2, c1, c0, 0 @ Disable I cache |
| mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt |
| mcr p15, 0, r1, c1, c0, 0 @ Restore ICache enable |
| mov pc, lr |
| |
| /* |
| * flush_user_cache_all() |
| * |
| * Clean and invalidate all cache entries in a particular |
| * address space. |
| */ |
| ENTRY(arm925_flush_user_cache_all) |
| /* FALLTHROUGH */ |
| |
| /* |
| * flush_kern_cache_all() |
| * |
| * Clean and invalidate the entire cache. |
| */ |
| ENTRY(arm925_flush_kern_cache_all) |
| mov r2, #VM_EXEC |
| mov ip, #0 |
| __flush_whole_cache: |
| #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
| mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache |
| #else |
| /* Flush entries in both segments at once, see NOTE1 above */ |
| mov r3, #(CACHE_DENTRIES - 1) << 4 @ 256 entries in segment |
| 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index |
| subs r3, r3, #1 << 4 |
| bcs 2b @ entries 255 to 0 |
| #endif |
| tst r2, #VM_EXEC |
| mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache |
| mcrne p15, 0, ip, c7, c10, 4 @ drain WB |
| 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 |
| */ |
| ENTRY(arm925_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 |
| #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
| mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry |
| mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry |
| add r0, r0, #CACHE_DLINESIZE |
| mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry |
| mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry |
| add r0, r0, #CACHE_DLINESIZE |
| #else |
| 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 |
| #endif |
| 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(arm925_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(arm925_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_page(void *page) |
| * |
| * Ensure no D cache aliasing occurs, either with itself or |
| * the I cache |
| * |
| * - addr - page aligned address |
| */ |
| ENTRY(arm925_flush_kern_dcache_page) |
| add r1, r0, #PAGE_SZ |
| 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) |
| */ |
| ENTRY(arm925_dma_inv_range) |
| #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH |
| 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 |
| #endif |
| 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) |
| */ |
| ENTRY(arm925_dma_clean_range) |
| #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH |
| 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 |
| #endif |
| 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(arm925_dma_flush_range) |
| bic r0, r0, #CACHE_DLINESIZE - 1 |
| 1: |
| #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH |
| mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry |
| #else |
| mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| #endif |
| add r0, r0, #CACHE_DLINESIZE |
| cmp r0, r1 |
| blo 1b |
| mcr p15, 0, r0, c7, c10, 4 @ drain WB |
| mov pc, lr |
| |
| ENTRY(arm925_cache_fns) |
| .long arm925_flush_kern_cache_all |
| .long arm925_flush_user_cache_all |
| .long arm925_flush_user_cache_range |
| .long arm925_coherent_kern_range |
| .long arm925_coherent_user_range |
| .long arm925_flush_kern_dcache_page |
| .long arm925_dma_inv_range |
| .long arm925_dma_clean_range |
| .long arm925_dma_flush_range |
| |
| ENTRY(cpu_arm925_dcache_clean_area) |
| #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH |
| 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| add r0, r0, #CACHE_DLINESIZE |
| subs r1, r1, #CACHE_DLINESIZE |
| bhi 1b |
| #endif |
| mcr p15, 0, r0, c7, c10, 4 @ drain WB |
| mov pc, lr |
| |
| /* =============================== PageTable ============================== */ |
| |
| /* |
| * cpu_arm925_switch_mm(pgd) |
| * |
| * Set the translation base pointer to be as described by pgd. |
| * |
| * pgd: new page tables |
| */ |
| .align 5 |
| ENTRY(cpu_arm925_switch_mm) |
| #ifdef CONFIG_MMU |
| mov ip, #0 |
| #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
| mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache |
| #else |
| /* Flush entries in bothe segments at once, see NOTE1 above */ |
| mov r3, #(CACHE_DENTRIES - 1) << 4 @ 256 entries in segment |
| 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index |
| subs r3, r3, #1 << 4 |
| bcs 2b @ entries 255 to 0 |
| #endif |
| mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache |
| mcr 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 |
| #endif |
| mov pc, lr |
| |
| /* |
| * cpu_arm925_set_pte(ptep, pte) |
| * |
| * Set a PTE and flush it out |
| */ |
| .align 5 |
| ENTRY(cpu_arm925_set_pte) |
| #ifdef CONFIG_MMU |
| str r1, [r0], #-2048 @ linux version |
| |
| eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY |
| |
| bic r2, r1, #PTE_SMALL_AP_MASK |
| bic r2, r2, #PTE_TYPE_MASK |
| orr r2, r2, #PTE_TYPE_SMALL |
| |
| tst r1, #L_PTE_USER @ User? |
| orrne r2, r2, #PTE_SMALL_AP_URO_SRW |
| |
| tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty? |
| orreq r2, r2, #PTE_SMALL_AP_UNO_SRW |
| |
| tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young? |
| movne r2, #0 |
| |
| #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
| eor r3, r2, #0x0a @ C & small page? |
| tst r3, #0x0b |
| biceq r2, r2, #4 |
| #endif |
| str r2, [r0] @ hardware version |
| mov r0, r0 |
| #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH |
| mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| #endif |
| mcr p15, 0, r0, c7, c10, 4 @ drain WB |
| #endif /* CONFIG_MMU */ |
| mov pc, lr |
| |
| __INIT |
| |
| .type __arm925_setup, #function |
| __arm925_setup: |
| mov r0, #0 |
| #if defined(CONFIG_CPU_ICACHE_STREAMING_DISABLE) |
| orr r0,r0,#1 << 7 |
| #endif |
| |
| /* Transparent on, D-cache clean & flush mode. See NOTE2 above */ |
| orr r0,r0,#1 << 1 @ transparent mode on |
| mcr p15, 0, r0, c15, c1, 0 @ write TI config register |
| |
| 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 |
| |
| #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
| mov r0, #4 @ disable write-back on caches explicitly |
| mcr p15, 7, r0, c15, c0, 0 |
| #endif |
| |
| mrc p15, 0, r0, c1, c0 @ get control register v4 |
| ldr r5, arm925_cr1_clear |
| bic r0, r0, r5 |
| ldr r5, arm925_cr1_set |
| orr r0, r0, r5 |
| #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN |
| orr r0, r0, #0x4000 @ .1.. .... .... .... |
| #endif |
| mov pc, lr |
| .size __arm925_setup, . - __arm925_setup |
| |
| /* |
| * R |
| * .RVI ZFRS BLDP WCAM |
| * .011 0001 ..11 1101 |
| * |
| */ |
| .type arm925_cr1_clear, #object |
| .type arm925_cr1_set, #object |
| arm925_cr1_clear: |
| .word 0x7f3f |
| arm925_cr1_set: |
| .word 0x313d |
| |
| __INITDATA |
| |
| /* |
| * Purpose : Function pointers used to access above functions - all calls |
| * come through these |
| */ |
| .type arm925_processor_functions, #object |
| arm925_processor_functions: |
| .word v4t_early_abort |
| .word cpu_arm925_proc_init |
| .word cpu_arm925_proc_fin |
| .word cpu_arm925_reset |
| .word cpu_arm925_do_idle |
| .word cpu_arm925_dcache_clean_area |
| .word cpu_arm925_switch_mm |
| .word cpu_arm925_set_pte |
| .size arm925_processor_functions, . - arm925_processor_functions |
| |
| .section ".rodata" |
| |
| .type cpu_arch_name, #object |
| cpu_arch_name: |
| .asciz "armv4t" |
| .size cpu_arch_name, . - cpu_arch_name |
| |
| .type cpu_elf_name, #object |
| cpu_elf_name: |
| .asciz "v4" |
| .size cpu_elf_name, . - cpu_elf_name |
| |
| .type cpu_arm925_name, #object |
| cpu_arm925_name: |
| .ascii "ARM925T" |
| #ifndef CONFIG_CPU_ICACHE_DISABLE |
| .ascii "i" |
| #endif |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| .ascii "d" |
| #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
| .ascii "(wt)" |
| #else |
| .ascii "(wb)" |
| #endif |
| #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN |
| .ascii "RR" |
| #endif |
| #endif |
| .ascii "\0" |
| .size cpu_arm925_name, . - cpu_arm925_name |
| |
| .align |
| |
| .section ".proc.info.init", #alloc, #execinstr |
| |
| .type __arm925_proc_info,#object |
| __arm925_proc_info: |
| .long 0x54029250 |
| .long 0xfffffff0 |
| .long PMD_TYPE_SECT | \ |
| PMD_BIT4 | \ |
| PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ |
| b __arm925_setup |
| .long cpu_arch_name |
| .long cpu_elf_name |
| .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB |
| .long cpu_arm925_name |
| .long arm925_processor_functions |
| .long v4wbi_tlb_fns |
| .long v4wb_user_fns |
| .long arm925_cache_fns |
| .size __arm925_proc_info, . - __arm925_proc_info |
| |
| .type __arm915_proc_info,#object |
| __arm915_proc_info: |
| .long 0x54029150 |
| .long 0xfffffff0 |
| .long PMD_TYPE_SECT | \ |
| PMD_BIT4 | \ |
| PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ |
| b __arm925_setup |
| .long cpu_arch_name |
| .long cpu_elf_name |
| .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB |
| .long cpu_arm925_name |
| .long arm925_processor_functions |
| .long v4wbi_tlb_fns |
| .long v4wb_user_fns |
| .long arm925_cache_fns |
| .size __arm925_proc_info, . - __arm925_proc_info |