diff options
Diffstat (limited to 'arch/arm/mm/proc-feroceon.S')
| -rw-r--r-- | arch/arm/mm/proc-feroceon.S | 698 |
1 files changed, 698 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-feroceon.S b/arch/arm/mm/proc-feroceon.S new file mode 100644 index 00000000..d3883eed --- /dev/null +++ b/arch/arm/mm/proc-feroceon.S @@ -0,0 +1,698 @@ +/* + * linux/arch/arm/mm/proc-feroceon.S: MMU functions for Feroceon + * + * Heavily based on proc-arm926.S + * Maintainer: Assaf Hoffman <hoffman@marvell.com> + * + * 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 <linux/linkage.h> +#include <linux/init.h> +#include <asm/assembler.h> +#include <asm/hwcap.h> +#include <asm/pgtable-hwdef.h> +#include <asm/pgtable.h> +#include <asm/page.h> +#include <asm/ptrace.h> +#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} + mov pc, 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 + mov pc, 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 +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 + mov pc, r0 + +/* + * 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 + mov pc, 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 + mov pc, 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 + 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 + */ + .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 + 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 + */ + .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 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 + */ + .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 + mov pc, 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 + 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) + */ + .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 + mov pc, 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 + 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) + */ + .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 + mov pc, 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 + mov pc, 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 + mov pc, 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 + mov pc, 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) + mov pc, lr +ENDPROC(feroceon_dma_unmap_area) + +ENTRY(feroceon_cache_fns) + .long feroceon_flush_icache_all + .long feroceon_flush_kern_cache_all + .long feroceon_flush_user_cache_all + .long feroceon_flush_user_cache_range + .long feroceon_coherent_kern_range + .long feroceon_coherent_user_range + .long feroceon_flush_kern_dcache_area + .long feroceon_dma_map_area + .long feroceon_dma_unmap_area + .long feroceon_dma_flush_range + +ENTRY(feroceon_range_cache_fns) + .long feroceon_flush_icache_all + .long feroceon_flush_kern_cache_all + .long feroceon_flush_user_cache_all + .long feroceon_flush_user_cache_range + .long feroceon_coherent_kern_range + .long feroceon_coherent_user_range + .long feroceon_range_flush_kern_dcache_area + .long feroceon_range_dma_map_area + .long feroceon_dma_unmap_area + .long feroceon_range_dma_flush_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 + mov pc, 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 + mov pc, r2 +#else + mov pc, 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 + mov pc, lr + + __CPUINIT + + .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 + mov pc, 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 + +/* + * Purpose : Function pointers used to access above functions - all calls + * come through these + */ + .type feroceon_processor_functions, #object +feroceon_processor_functions: + .word v5t_early_abort + .word legacy_pabort + .word cpu_feroceon_proc_init + .word cpu_feroceon_proc_fin + .word cpu_feroceon_reset + .word cpu_feroceon_do_idle + .word cpu_feroceon_dcache_clean_area + .word cpu_feroceon_switch_mm + .word cpu_feroceon_set_pte_ext + .word 0 + .word 0 + .word 0 + .size feroceon_processor_functions, . - feroceon_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_feroceon_name, #object +cpu_feroceon_name: + .asciz "Feroceon" + .size cpu_feroceon_name, . - cpu_feroceon_name + + .type cpu_88fr531_name, #object +cpu_88fr531_name: + .asciz "Feroceon 88FR531-vd" + .size cpu_88fr531_name, . - cpu_88fr531_name + + .type cpu_88fr571_name, #object +cpu_88fr571_name: + .asciz "Feroceon 88FR571-vd" + .size cpu_88fr571_name, . - cpu_88fr571_name + + .type cpu_88fr131_name, #object +cpu_88fr131_name: + .asciz "Feroceon 88FR131" + .size cpu_88fr131_name, . - cpu_88fr131_name + + .align + + .section ".proc.info.init", #alloc, #execinstr + +#ifdef CONFIG_CPU_FEROCEON_OLD_ID + .type __feroceon_old_id_proc_info,#object +__feroceon_old_id_proc_info: + .long 0x41009260 + .long 0xff00fff0 + .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 __feroceon_setup + .long cpu_arch_name + .long cpu_elf_name + .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP + .long cpu_feroceon_name + .long feroceon_processor_functions + .long v4wbi_tlb_fns + .long feroceon_user_fns + .long feroceon_cache_fns + .size __feroceon_old_id_proc_info, . - __feroceon_old_id_proc_info +#endif + + .type __88fr531_proc_info,#object +__88fr531_proc_info: + .long 0x56055310 + .long 0xfffffff0 + .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 __feroceon_setup + .long cpu_arch_name + .long cpu_elf_name + .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP + .long cpu_88fr531_name + .long feroceon_processor_functions + .long v4wbi_tlb_fns + .long feroceon_user_fns + .long feroceon_cache_fns + .size __88fr531_proc_info, . - __88fr531_proc_info + + .type __88fr571_proc_info,#object +__88fr571_proc_info: + .long 0x56155710 + .long 0xfffffff0 + .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 __feroceon_setup + .long cpu_arch_name + .long cpu_elf_name + .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP + .long cpu_88fr571_name + .long feroceon_processor_functions + .long v4wbi_tlb_fns + .long feroceon_user_fns + .long feroceon_range_cache_fns + .size __88fr571_proc_info, . - __88fr571_proc_info + + .type __88fr131_proc_info,#object +__88fr131_proc_info: + .long 0x56251310 + .long 0xfffffff0 + .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 __feroceon_setup + .long cpu_arch_name + .long cpu_elf_name + .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP + .long cpu_88fr131_name + .long feroceon_processor_functions + .long v4wbi_tlb_fns + .long feroceon_user_fns + .long feroceon_range_cache_fns + .size __88fr131_proc_info, . - __88fr131_proc_info |