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arch/arm/mm/proc-arm940.S
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/* * linux/arch/arm/mm/arm940.S: utility functions for ARM940T * * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com) * * 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. * */ #include <linux/linkage.h> #include <linux/init.h> #include <asm/assembler.h> |
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#include <asm/hwcap.h> |
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#include <asm/pgtable-hwdef.h> #include <asm/pgtable.h> |
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#include <asm/ptrace.h> |
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#include "proc-macros.S" |
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/* ARM940T has a 4KB DCache comprising 256 lines of 4 words */ #define CACHE_DLINESIZE 16 #define CACHE_DSEGMENTS 4 #define CACHE_DENTRIES 64 .text /* * cpu_arm940_proc_init() * cpu_arm940_switch_mm() * * These are not required. */ ENTRY(cpu_arm940_proc_init) ENTRY(cpu_arm940_switch_mm) mov pc, lr /* * cpu_arm940_proc_fin() */ ENTRY(cpu_arm940_proc_fin) |
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mrc p15, 0, r0, c1, c0, 0 @ ctrl register bic r0, r0, #0x00001000 @ i-cache bic r0, r0, #0x00000004 @ d-cache mcr p15, 0, r0, c1, c0, 0 @ disable caches |
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mov pc, lr |
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/* * cpu_arm940_reset(loc) * Params : r0 = address to jump to * Notes : This sets up everything for a reset */ |
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.pushsection .idmap.text, "ax" |
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ENTRY(cpu_arm940_reset) mov ip, #0 mcr p15, 0, ip, c7, c5, 0 @ flush I cache mcr p15, 0, ip, c7, c6, 0 @ flush D cache mcr p15, 0, ip, c7, c10, 4 @ drain WB mrc p15, 0, ip, c1, c0, 0 @ ctrl register bic ip, ip, #0x00000005 @ .............c.p bic ip, ip, #0x00001000 @ i-cache mcr p15, 0, ip, c1, c0, 0 @ ctrl register mov pc, r0 |
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ENDPROC(cpu_arm940_reset) .popsection |
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/* * cpu_arm940_do_idle() */ .align 5 ENTRY(cpu_arm940_do_idle) mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt mov pc, lr /* |
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* flush_icache_all() * * Unconditionally clean and invalidate the entire icache. */ ENTRY(arm940_flush_icache_all) mov r0, #0 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache mov pc, lr ENDPROC(arm940_flush_icache_all) /* |
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* flush_user_cache_all() */ ENTRY(arm940_flush_user_cache_all) /* FALLTHROUGH */ /* * flush_kern_cache_all() * * Clean and invalidate the entire cache. */ ENTRY(arm940_flush_kern_cache_all) mov r2, #VM_EXEC /* FALLTHROUGH */ /* * flush_user_cache_range(start, end, flags) * * There is no efficient way to flush a range of cache entries * in the specified address range. Thus, flushes all. * * - start - start address (inclusive) * - end - end address (exclusive) * - flags - vm_flags describing address space */ ENTRY(arm940_flush_user_cache_range) mov ip, #0 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH mcr p15, 0, ip, c7, c6, 0 @ flush D cache #else mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries 2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index subs r3, r3, #1 << 26 bcs 2b @ entries 63 to 0 subs r1, r1, #1 << 4 bcs 1b @ segments 3 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 /* * 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(arm940_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(arm940_coherent_user_range) /* FALLTHROUGH */ /* |
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* flush_kern_dcache_area(void *addr, size_t size) |
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* * Ensure no D cache aliasing occurs, either with itself or * the I cache * |
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* - addr - kernel address * - size - region size |
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*/ |
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ENTRY(arm940_flush_kern_dcache_area) |
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mov ip, #0 mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries 2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index subs r3, r3, #1 << 26 bcs 2b @ entries 63 to 0 subs r1, r1, #1 << 4 bcs 1b @ segments 7 to 0 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache mcr p15, 0, ip, c7, c10, 4 @ drain WB mov pc, lr /* * dma_inv_range(start, end) * * There is no efficient way to invalidate a specifid virtual * address range. Thus, invalidates all. * * - start - virtual start address * - end - virtual end address */ |
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arm940_dma_inv_range: |
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mov ip, #0 mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries 2: mcr p15, 0, r3, c7, c6, 2 @ flush D entry subs r3, r3, #1 << 26 bcs 2b @ entries 63 to 0 subs r1, r1, #1 << 4 bcs 1b @ segments 7 to 0 mcr p15, 0, ip, c7, c10, 4 @ drain WB mov pc, lr /* * dma_clean_range(start, end) * * There is no efficient way to clean a specifid virtual * address range. Thus, cleans all. * * - start - virtual start address * - end - virtual end address */ |
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arm940_dma_clean_range: |
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ENTRY(cpu_arm940_dcache_clean_area) mov ip, #0 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries 2: mcr p15, 0, r3, c7, c10, 2 @ clean D entry subs r3, r3, #1 << 26 bcs 2b @ entries 63 to 0 subs r1, r1, #1 << 4 bcs 1b @ segments 7 to 0 #endif mcr p15, 0, ip, c7, c10, 4 @ drain WB mov pc, lr /* * dma_flush_range(start, end) * * There is no efficient way to clean and invalidate a specifid * virtual address range. * * - start - virtual start address * - end - virtual end address */ ENTRY(arm940_dma_flush_range) mov ip, #0 mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries 2: #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH mcr p15, 0, r3, c7, c14, 2 @ clean/flush D entry #else |
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mcr p15, 0, r3, c7, c6, 2 @ invalidate D entry |
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#endif subs r3, r3, #1 << 26 bcs 2b @ entries 63 to 0 subs r1, r1, #1 << 4 bcs 1b @ segments 7 to 0 mcr p15, 0, ip, c7, c10, 4 @ drain WB mov pc, lr |
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/* * dma_map_area(start, size, dir) * - start - kernel virtual start address * - size - size of region * - dir - DMA direction */ ENTRY(arm940_dma_map_area) add r1, r1, r0 cmp r2, #DMA_TO_DEVICE beq arm940_dma_clean_range bcs arm940_dma_inv_range b arm940_dma_flush_range ENDPROC(arm940_dma_map_area) /* * dma_unmap_area(start, size, dir) * - start - kernel virtual start address * - size - size of region * - dir - DMA direction */ ENTRY(arm940_dma_unmap_area) mov pc, lr ENDPROC(arm940_dma_unmap_area) |
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@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S) define_cache_functions arm940 |
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__CPUINIT |
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.type __arm940_setup, #function __arm940_setup: mov r0, #0 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache mcr p15, 0, r0, c7, c10, 4 @ drain WB mcr p15, 0, r0, c6, c3, 0 @ disable data area 3~7 mcr p15, 0, r0, c6, c4, 0 mcr p15, 0, r0, c6, c5, 0 mcr p15, 0, r0, c6, c6, 0 mcr p15, 0, r0, c6, c7, 0 mcr p15, 0, r0, c6, c3, 1 @ disable instruction area 3~7 mcr p15, 0, r0, c6, c4, 1 mcr p15, 0, r0, c6, c5, 1 mcr p15, 0, r0, c6, c6, 1 mcr p15, 0, r0, c6, c7, 1 mov r0, #0x0000003F @ base = 0, size = 4GB mcr p15, 0, r0, c6, c0, 0 @ set area 0, default mcr p15, 0, r0, c6, c0, 1 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB) mov r2, #10 @ 11 is the minimum (4KB) 1: add r2, r2, #1 @ area size *= 2 mov r1, r1, lsr #1 bne 1b @ count not zero r-shift orr r0, r0, r2, lsl #1 @ the area register value orr r0, r0, #1 @ set enable bit mcr p15, 0, r0, c6, c1, 0 @ set area 1, RAM mcr p15, 0, r0, c6, c1, 1 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB) mov r2, #10 @ 11 is the minimum (4KB) 1: add r2, r2, #1 @ area size *= 2 mov r1, r1, lsr #1 bne 1b @ count not zero r-shift orr r0, r0, r2, lsl #1 @ the area register value orr r0, r0, #1 @ set enable bit mcr p15, 0, r0, c6, c2, 0 @ set area 2, ROM/FLASH mcr p15, 0, r0, c6, c2, 1 mov r0, #0x06 mcr p15, 0, r0, c2, c0, 0 @ Region 1&2 cacheable mcr p15, 0, r0, c2, c0, 1 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH mov r0, #0x00 @ disable whole write buffer #else mov r0, #0x02 @ Region 1 write bufferred #endif mcr p15, 0, r0, c3, c0, 0 mov r0, #0x10000 sub r0, r0, #1 @ r0 = 0xffff mcr p15, 0, r0, c5, c0, 0 @ all read/write access mcr p15, 0, r0, c5, c0, 1 mrc p15, 0, r0, c1, c0 @ get control register orr r0, r0, #0x00001000 @ I-cache orr r0, r0, #0x00000005 @ MPU/D-cache mov pc, lr .size __arm940_setup, . - __arm940_setup __INITDATA |
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@ define struct processor (see <asm/proc-fns.h> and proc-macros.S) define_processor_functions arm940, dabort=nommu_early_abort, pabort=legacy_pabort, nommu=1 |
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.section ".rodata" |
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string cpu_arch_name, "armv4t" string cpu_elf_name, "v4" string cpu_arm940_name, "ARM940T" |
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.align .section ".proc.info.init", #alloc, #execinstr .type __arm940_proc_info,#object __arm940_proc_info: .long 0x41009400 .long 0xff00fff0 .long 0 b __arm940_setup .long cpu_arch_name .long cpu_elf_name .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB .long cpu_arm940_name .long arm940_processor_functions .long 0 .long 0 .long arm940_cache_fns .size __arm940_proc_info, . - __arm940_proc_info |