| /* |
| * linux/arch/arm/mm/proc-v7.S |
| * |
| * Copyright (C) 2001 Deep Blue Solutions Ltd. |
| * |
| * 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. |
| * |
| * This is the "shell" of the ARMv7 processor support. |
| */ |
| #include <linux/init.h> |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/hwcap.h> |
| #include <asm/pgtable-hwdef.h> |
| #include <asm/pgtable.h> |
| |
| #include "proc-macros.S" |
| |
| #ifdef CONFIG_ARM_LPAE |
| #include "proc-v7-3level.S" |
| #else |
| #include "proc-v7-2level.S" |
| #endif |
| |
| ENTRY(cpu_v7_proc_init) |
| mov pc, lr |
| ENDPROC(cpu_v7_proc_init) |
| |
| ENTRY(cpu_v7_proc_fin) |
| mrc p15, 0, r0, c1, c0, 0 @ ctrl register |
| bic r0, r0, #0x1000 @ ...i............ |
| bic r0, r0, #0x0006 @ .............ca. |
| mcr p15, 0, r0, c1, c0, 0 @ disable caches |
| mov pc, lr |
| ENDPROC(cpu_v7_proc_fin) |
| |
| /* |
| * cpu_v7_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 |
| * |
| * This code must be executed using a flat identity mapping with |
| * caches disabled. |
| */ |
| .align 5 |
| .pushsection .idmap.text, "ax" |
| ENTRY(cpu_v7_reset) |
| mrc p15, 0, r1, c1, c0, 0 @ ctrl register |
| bic r1, r1, #0x1 @ ...............m |
| THUMB( bic r1, r1, #1 << 30 ) @ SCTLR.TE (Thumb exceptions) |
| mcr p15, 0, r1, c1, c0, 0 @ disable MMU |
| isb |
| mov pc, r0 |
| ENDPROC(cpu_v7_reset) |
| .popsection |
| |
| /* |
| * cpu_v7_do_idle() |
| * |
| * Idle the processor (eg, wait for interrupt). |
| * |
| * IRQs are already disabled. |
| */ |
| ENTRY(cpu_v7_do_idle) |
| dsb @ WFI may enter a low-power mode |
| wfi |
| mov pc, lr |
| ENDPROC(cpu_v7_do_idle) |
| |
| ENTRY(cpu_v7_dcache_clean_area) |
| #ifndef TLB_CAN_READ_FROM_L1_CACHE |
| dcache_line_size r2, r3 |
| 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| add r0, r0, r2 |
| subs r1, r1, r2 |
| bhi 1b |
| dsb |
| #endif |
| mov pc, lr |
| ENDPROC(cpu_v7_dcache_clean_area) |
| |
| string cpu_v7_name, "ARMv7 Processor" |
| .align |
| |
| /* Suspend/resume support: derived from arch/arm/mach-s5pv210/sleep.S */ |
| .globl cpu_v7_suspend_size |
| .equ cpu_v7_suspend_size, 4 * 8 |
| #ifdef CONFIG_ARM_CPU_SUSPEND |
| ENTRY(cpu_v7_do_suspend) |
| stmfd sp!, {r4 - r10, lr} |
| mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID |
| mrc p15, 0, r5, c13, c0, 3 @ User r/o thread ID |
| stmia r0!, {r4 - r5} |
| mrc p15, 0, r6, c3, c0, 0 @ Domain ID |
| mrc p15, 0, r7, c2, c0, 1 @ TTB 1 |
| mrc p15, 0, r11, c2, c0, 2 @ TTB control register |
| mrc p15, 0, r8, c1, c0, 0 @ Control register |
| mrc p15, 0, r9, c1, c0, 1 @ Auxiliary control register |
| mrc p15, 0, r10, c1, c0, 2 @ Co-processor access control |
| stmia r0, {r6 - r11} |
| ldmfd sp!, {r4 - r10, pc} |
| ENDPROC(cpu_v7_do_suspend) |
| |
| ENTRY(cpu_v7_do_resume) |
| mov ip, #0 |
| mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs |
| mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache |
| mcr p15, 0, ip, c13, c0, 1 @ set reserved context ID |
| ldmia r0!, {r4 - r5} |
| mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID |
| mcr p15, 0, r5, c13, c0, 3 @ User r/o thread ID |
| ldmia r0, {r6 - r11} |
| mcr p15, 0, r6, c3, c0, 0 @ Domain ID |
| #ifndef CONFIG_ARM_LPAE |
| ALT_SMP(orr r1, r1, #TTB_FLAGS_SMP) |
| ALT_UP(orr r1, r1, #TTB_FLAGS_UP) |
| #endif |
| mcr p15, 0, r1, c2, c0, 0 @ TTB 0 |
| mcr p15, 0, r7, c2, c0, 1 @ TTB 1 |
| mcr p15, 0, r11, c2, c0, 2 @ TTB control register |
| mrc p15, 0, r4, c1, c0, 1 @ Read Auxiliary control register |
| teq r4, r9 @ Is it already set? |
| mcrne p15, 0, r9, c1, c0, 1 @ No, so write it |
| mcr p15, 0, r10, c1, c0, 2 @ Co-processor access control |
| ldr r4, =PRRR @ PRRR |
| ldr r5, =NMRR @ NMRR |
| mcr p15, 0, r4, c10, c2, 0 @ write PRRR |
| mcr p15, 0, r5, c10, c2, 1 @ write NMRR |
| isb |
| dsb |
| mov r0, r8 @ control register |
| b cpu_resume_mmu |
| ENDPROC(cpu_v7_do_resume) |
| #endif |
| |
| __CPUINIT |
| |
| /* |
| * __v7_setup |
| * |
| * Initialise TLB, Caches, and MMU state ready to switch the MMU |
| * on. Return in r0 the new CP15 C1 control register setting. |
| * |
| * We automatically detect if we have a Harvard cache, and use the |
| * Harvard cache control instructions insead of the unified cache |
| * control instructions. |
| * |
| * This should be able to cover all ARMv7 cores. |
| * |
| * It is assumed that: |
| * - cache type register is implemented |
| */ |
| __v7_ca5mp_setup: |
| __v7_ca9mp_setup: |
| mov r10, #(1 << 0) @ TLB ops broadcasting |
| b 1f |
| __v7_ca15mp_setup: |
| mov r10, #0 |
| 1: |
| #ifdef CONFIG_SMP |
| ALT_SMP(mrc p15, 0, r0, c1, c0, 1) |
| ALT_UP(mov r0, #(1 << 6)) @ fake it for UP |
| tst r0, #(1 << 6) @ SMP/nAMP mode enabled? |
| orreq r0, r0, #(1 << 6) @ Enable SMP/nAMP mode |
| orreq r0, r0, r10 @ Enable CPU-specific SMP bits |
| mcreq p15, 0, r0, c1, c0, 1 |
| #endif |
| __v7_setup: |
| adr r12, __v7_setup_stack @ the local stack |
| stmia r12, {r0-r5, r7, r9, r11, lr} |
| bl v7_flush_dcache_all |
| ldmia r12, {r0-r5, r7, r9, r11, lr} |
| |
| mrc p15, 0, r0, c0, c0, 0 @ read main ID register |
| and r10, r0, #0xff000000 @ ARM? |
| teq r10, #0x41000000 |
| bne 3f |
| and r5, r0, #0x00f00000 @ variant |
| and r6, r0, #0x0000000f @ revision |
| orr r6, r6, r5, lsr #20-4 @ combine variant and revision |
| ubfx r0, r0, #4, #12 @ primary part number |
| |
| /* Cortex-A8 Errata */ |
| ldr r10, =0x00000c08 @ Cortex-A8 primary part number |
| teq r0, r10 |
| bne 2f |
| #ifdef CONFIG_ARM_ERRATA_430973 |
| teq r5, #0x00100000 @ only present in r1p* |
| mrceq p15, 0, r10, c1, c0, 1 @ read aux control register |
| orreq r10, r10, #(1 << 6) @ set IBE to 1 |
| mcreq p15, 0, r10, c1, c0, 1 @ write aux control register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_458693 |
| teq r6, #0x20 @ only present in r2p0 |
| mrceq p15, 0, r10, c1, c0, 1 @ read aux control register |
| orreq r10, r10, #(1 << 5) @ set L1NEON to 1 |
| orreq r10, r10, #(1 << 9) @ set PLDNOP to 1 |
| mcreq p15, 0, r10, c1, c0, 1 @ write aux control register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_460075 |
| teq r6, #0x20 @ only present in r2p0 |
| mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register |
| tsteq r10, #1 << 22 |
| orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit |
| mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register |
| #endif |
| b 3f |
| |
| /* Cortex-A9 Errata */ |
| 2: ldr r10, =0x00000c09 @ Cortex-A9 primary part number |
| teq r0, r10 |
| bne 3f |
| #ifdef CONFIG_ARM_ERRATA_742230 |
| cmp r6, #0x22 @ only present up to r2p2 |
| mrcle p15, 0, r10, c15, c0, 1 @ read diagnostic register |
| orrle r10, r10, #1 << 4 @ set bit #4 |
| mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_742231 |
| teq r6, #0x20 @ present in r2p0 |
| teqne r6, #0x21 @ present in r2p1 |
| teqne r6, #0x22 @ present in r2p2 |
| mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register |
| orreq r10, r10, #1 << 12 @ set bit #12 |
| orreq r10, r10, #1 << 22 @ set bit #22 |
| mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_743622 |
| teq r6, #0x20 @ present in r2p0 |
| teqne r6, #0x21 @ present in r2p1 |
| teqne r6, #0x22 @ present in r2p2 |
| mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register |
| orreq r10, r10, #1 << 6 @ set bit #6 |
| mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_751472 |
| cmp r6, #0x30 @ present prior to r3p0 |
| mrclt p15, 0, r10, c15, c0, 1 @ read diagnostic register |
| orrlt r10, r10, #1 << 11 @ set bit #11 |
| mcrlt p15, 0, r10, c15, c0, 1 @ write diagnostic register |
| #endif |
| |
| 3: mov r10, #0 |
| #ifdef HARVARD_CACHE |
| mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate |
| #endif |
| dsb |
| #ifdef CONFIG_MMU |
| mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs |
| v7_ttb_setup r10, r4, r8, r5 @ TTBCR, TTBRx setup |
| ldr r5, =PRRR @ PRRR |
| ldr r6, =NMRR @ NMRR |
| mcr p15, 0, r5, c10, c2, 0 @ write PRRR |
| mcr p15, 0, r6, c10, c2, 1 @ write NMRR |
| #endif |
| adr r5, v7_crval |
| ldmia r5, {r5, r6} |
| #ifdef CONFIG_CPU_ENDIAN_BE8 |
| orr r6, r6, #1 << 25 @ big-endian page tables |
| #endif |
| #ifdef CONFIG_SWP_EMULATE |
| orr r5, r5, #(1 << 10) @ set SW bit in "clear" |
| bic r6, r6, #(1 << 10) @ clear it in "mmuset" |
| #endif |
| mrc p15, 0, r0, c1, c0, 0 @ read control register |
| bic r0, r0, r5 @ clear bits them |
| orr r0, r0, r6 @ set them |
| THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions |
| mov pc, lr @ return to head.S:__ret |
| ENDPROC(__v7_setup) |
| |
| .align 2 |
| __v7_setup_stack: |
| .space 4 * 11 @ 11 registers |
| |
| __INITDATA |
| |
| @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) |
| define_processor_functions v7, dabort=v7_early_abort, pabort=v7_pabort, suspend=1 |
| |
| .section ".rodata" |
| |
| string cpu_arch_name, "armv7" |
| string cpu_elf_name, "v7" |
| .align |
| |
| .section ".proc.info.init", #alloc, #execinstr |
| |
| /* |
| * Standard v7 proc info content |
| */ |
| .macro __v7_proc initfunc, mm_mmuflags = 0, io_mmuflags = 0, hwcaps = 0 |
| ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \ |
| PMD_SECT_AF | PMD_FLAGS_SMP | \mm_mmuflags) |
| ALT_UP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \ |
| PMD_SECT_AF | PMD_FLAGS_UP | \mm_mmuflags) |
| .long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ | PMD_SECT_AF | \io_mmuflags |
| W(b) \initfunc |
| .long cpu_arch_name |
| .long cpu_elf_name |
| .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_FAST_MULT | \ |
| HWCAP_EDSP | HWCAP_TLS | \hwcaps |
| .long cpu_v7_name |
| .long v7_processor_functions |
| .long v7wbi_tlb_fns |
| .long v6_user_fns |
| .long v7_cache_fns |
| .endm |
| |
| #ifndef CONFIG_ARM_LPAE |
| /* |
| * ARM Ltd. Cortex A5 processor. |
| */ |
| .type __v7_ca5mp_proc_info, #object |
| __v7_ca5mp_proc_info: |
| .long 0x410fc050 |
| .long 0xff0ffff0 |
| __v7_proc __v7_ca5mp_setup |
| .size __v7_ca5mp_proc_info, . - __v7_ca5mp_proc_info |
| |
| /* |
| * ARM Ltd. Cortex A9 processor. |
| */ |
| .type __v7_ca9mp_proc_info, #object |
| __v7_ca9mp_proc_info: |
| .long 0x410fc090 |
| .long 0xff0ffff0 |
| __v7_proc __v7_ca9mp_setup |
| .size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info |
| #endif /* CONFIG_ARM_LPAE */ |
| |
| /* |
| * ARM Ltd. Cortex A15 processor. |
| */ |
| .type __v7_ca15mp_proc_info, #object |
| __v7_ca15mp_proc_info: |
| .long 0x410fc0f0 |
| .long 0xff0ffff0 |
| __v7_proc __v7_ca15mp_setup, hwcaps = HWCAP_IDIV |
| .size __v7_ca15mp_proc_info, . - __v7_ca15mp_proc_info |
| |
| /* |
| * Match any ARMv7 processor core. |
| */ |
| .type __v7_proc_info, #object |
| __v7_proc_info: |
| .long 0x000f0000 @ Required ID value |
| .long 0x000f0000 @ Mask for ID |
| __v7_proc __v7_setup |
| .size __v7_proc_info, . - __v7_proc_info |
