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Diffstat (limited to 'arch/arm/mm/proc-sa110.S')
| -rw-r--r-- | arch/arm/mm/proc-sa110.S | 272 |
1 files changed, 272 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-sa110.S b/arch/arm/mm/proc-sa110.S new file mode 100644 index 0000000..360cae9 --- /dev/null +++ b/arch/arm/mm/proc-sa110.S @@ -0,0 +1,272 @@ +/* + * linux/arch/arm/mm/proc-sa110.S + * + * Copyright (C) 1997-2002 Russell King + * + * 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 SA110 + * + * These are the low level assembler for performing cache and TLB + * functions on the StrongARM-110. + */ +#include <linux/linkage.h> +#include <linux/init.h> +#include <asm/assembler.h> +#include <asm/constants.h> +#include <asm/procinfo.h> +#include <asm/hardware.h> +#include <asm/pgtable.h> +#include <asm/ptrace.h> + +/* + * the cache line size of the I and D cache + */ +#define DCACHELINESIZE 32 +#define FLUSH_OFFSET 32768 + + .macro flush_110_dcache rd, ra, re + ldr \rd, =flush_base + ldr \ra, [\rd] + eor \ra, \ra, #FLUSH_OFFSET + str \ra, [\rd] + add \re, \ra, #16384 @ only necessary for 16k +1001: ldr \rd, [\ra], #DCACHELINESIZE + teq \re, \ra + bne 1001b + .endm + + .data +flush_base: + .long FLUSH_BASE + .text + +/* + * cpu_sa110_proc_init() + */ +ENTRY(cpu_sa110_proc_init) + mov r0, #0 + mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching + mov pc, lr + +/* + * cpu_sa110_proc_fin() + */ +ENTRY(cpu_sa110_proc_fin) + stmfd sp!, {lr} + mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE + msr cpsr_c, ip + bl v4wb_flush_kern_cache_all @ clean caches +1: mov r0, #0 + mcr p15, 0, r0, c15, c2, 2 @ Disable clock switching + 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_sa110_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_sa110_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, #0x000f @ ............wcam + bic ip, ip, #0x1100 @ ...i...s........ + mcr p15, 0, ip, c1, c0, 0 @ ctrl register + mov pc, r0 + +/* + * cpu_sa110_do_idle(type) + * + * Cause the processor to idle + * + * type: call type: + * 0 = slow idle + * 1 = fast idle + * 2 = switch to slow processor clock + * 3 = switch to fast processor clock + */ + .align 5 + +ENTRY(cpu_sa110_do_idle) + mcr p15, 0, ip, c15, c2, 2 @ disable clock switching + ldr r1, =UNCACHEABLE_ADDR @ load from uncacheable loc + ldr r1, [r1, #0] @ force switch to MCLK + mov r0, r0 @ safety + mov r0, r0 @ safety + mov r0, r0 @ safety + mcr p15, 0, r0, c15, c8, 2 @ Wait for interrupt, cache aligned + mov r0, r0 @ safety + mov r0, r0 @ safety + mov r0, r0 @ safety + mcr p15, 0, r0, c15, c1, 2 @ enable clock switching + mov pc, lr + +/* ================================= CACHE ================================ */ + +/* + * cpu_sa110_dcache_clean_area(addr,sz) + * + * Clean the specified entry of any caches such that the MMU + * translation fetches will obtain correct data. + * + * addr: cache-unaligned virtual address + */ + .align 5 +ENTRY(cpu_sa110_dcache_clean_area) +1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry + add r0, r0, #DCACHELINESIZE + subs r1, r1, #DCACHELINESIZE + bhi 1b + mov pc, lr + +/* =============================== PageTable ============================== */ + +/* + * cpu_sa110_switch_mm(pgd) + * + * Set the translation base pointer to be as described by pgd. + * + * pgd: new page tables + */ + .align 5 +ENTRY(cpu_sa110_switch_mm) + flush_110_dcache r3, ip, r1 + mov r1, #0 + mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache + mcr p15, 0, r1, c7, c10, 4 @ drain WB + mcr p15, 0, r0, c2, c0, 0 @ load page table pointer + mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs + mov pc, lr + +/* + * cpu_sa110_set_pte(ptep, pte) + * + * Set a PTE and flush it out + */ + .align 5 +ENTRY(cpu_sa110_set_pte) + 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 + + str r2, [r0] @ hardware version + 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 + + __INIT + + .type __sa110_setup, #function +__sa110_setup: + mov r10, #0 + mcr p15, 0, r10, c7, c7 @ invalidate I,D caches on v4 + mcr p15, 0, r10, c7, c10, 4 @ drain write buffer on v4 + mcr p15, 0, r10, c8, c7 @ invalidate I,D TLBs on v4 + mrc p15, 0, r0, c1, c0 @ get control register v4 + ldr r5, sa110_cr1_clear + bic r0, r0, r5 + ldr r5, sa110_cr1_set + orr r0, r0, r5 + mov pc, lr + .size __sa110_setup, . - __sa110_setup + + /* + * R + * .RVI ZFRS BLDP WCAM + * ..01 0001 ..11 1101 + * + */ + .type sa110_cr1_clear, #object + .type sa110_cr1_set, #object +sa110_cr1_clear: + .word 0x3f3f +sa110_cr1_set: + .word 0x113d + + __INITDATA + +/* + * Purpose : Function pointers used to access above functions - all calls + * come through these + */ + + .type sa110_processor_functions, #object +ENTRY(sa110_processor_functions) + .word v4_early_abort + .word cpu_sa110_proc_init + .word cpu_sa110_proc_fin + .word cpu_sa110_reset + .word cpu_sa110_do_idle + .word cpu_sa110_dcache_clean_area + .word cpu_sa110_switch_mm + .word cpu_sa110_set_pte + .size sa110_processor_functions, . - sa110_processor_functions + + .section ".rodata" + + .type cpu_arch_name, #object +cpu_arch_name: + .asciz "armv4" + .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_sa110_name, #object +cpu_sa110_name: + .asciz "StrongARM-110" + .size cpu_sa110_name, . - cpu_sa110_name + + .align + + .section ".proc.info", #alloc, #execinstr + + .type __sa110_proc_info,#object +__sa110_proc_info: + .long 0x4401a100 + .long 0xfffffff0 + .long PMD_TYPE_SECT | \ + PMD_SECT_BUFFERABLE | \ + PMD_SECT_CACHEABLE | \ + PMD_SECT_AP_WRITE | \ + PMD_SECT_AP_READ + b __sa110_setup + .long cpu_arch_name + .long cpu_elf_name + .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT + .long cpu_sa110_name + .long sa110_processor_functions + .long v4wb_tlb_fns + .long v4wb_user_fns + .long v4wb_cache_fns + .size __sa110_proc_info, . - __sa110_proc_info |