diff options
Diffstat (limited to 'arch/arm/mm/proc-arm740.S')
| -rw-r--r-- | arch/arm/mm/proc-arm740.S | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-arm740.S b/arch/arm/mm/proc-arm740.S new file mode 100644 index 000000000..f2ec3bc60 --- /dev/null +++ b/arch/arm/mm/proc-arm740.S @@ -0,0 +1,147 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/arch/arm/mm/arm740.S: utility functions for ARM740 + * + * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com) + */ +#include <linux/linkage.h> +#include <linux/init.h> +#include <linux/pgtable.h> +#include <asm/assembler.h> +#include <asm/asm-offsets.h> +#include <asm/hwcap.h> +#include <asm/pgtable-hwdef.h> +#include <asm/ptrace.h> + +#include "proc-macros.S" + + .text +/* + * cpu_arm740_proc_init() + * cpu_arm740_do_idle() + * cpu_arm740_dcache_clean_area() + * cpu_arm740_switch_mm() + * + * These are not required. + */ +ENTRY(cpu_arm740_proc_init) +ENTRY(cpu_arm740_do_idle) +ENTRY(cpu_arm740_dcache_clean_area) +ENTRY(cpu_arm740_switch_mm) + ret lr + +/* + * cpu_arm740_proc_fin() + */ +ENTRY(cpu_arm740_proc_fin) + mrc p15, 0, r0, c1, c0, 0 + bic r0, r0, #0x3f000000 @ bank/f/lock/s + bic r0, r0, #0x0000000c @ w-buffer/cache + mcr p15, 0, r0, c1, c0, 0 @ disable caches + ret lr + +/* + * cpu_arm740_reset(loc) + * Params : r0 = address to jump to + * Notes : This sets up everything for a reset + */ + .pushsection .idmap.text, "ax" +ENTRY(cpu_arm740_reset) + mov ip, #0 + mcr p15, 0, ip, c7, c0, 0 @ invalidate cache + mrc p15, 0, ip, c1, c0, 0 @ get ctrl register + bic ip, ip, #0x0000000c @ ............wc.. + mcr p15, 0, ip, c1, c0, 0 @ ctrl register + ret r0 +ENDPROC(cpu_arm740_reset) + .popsection + + .type __arm740_setup, #function +__arm740_setup: + mov r0, #0 + mcr p15, 0, r0, c7, c0, 0 @ invalidate caches + + mcr p15, 0, r0, c6, c3 @ disable area 3~7 + mcr p15, 0, r0, c6, c4 + mcr p15, 0, r0, c6, c5 + mcr p15, 0, r0, c6, c6 + mcr p15, 0, r0, c6, c7 + + mov r0, #0x0000003F @ base = 0, size = 4GB + mcr p15, 0, r0, c6, c0 @ set area 0, default + + ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM + ldr r3, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB) + mov r4, #10 @ 11 is the minimum (4KB) +1: add r4, r4, #1 @ area size *= 2 + movs r3, r3, lsr #1 + bne 1b @ count not zero r-shift + orr r0, r0, r4, lsl #1 @ the area register value + orr r0, r0, #1 @ set enable bit + mcr p15, 0, r0, c6, c1 @ set area 1, RAM + + ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH + ldr r3, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB) + cmp r3, #0 + moveq r0, #0 + beq 2f + mov r4, #10 @ 11 is the minimum (4KB) +1: add r4, r4, #1 @ area size *= 2 + movs r3, r3, lsr #1 + bne 1b @ count not zero r-shift + orr r0, r0, r4, lsl #1 @ the area register value + orr r0, r0, #1 @ set enable bit +2: mcr p15, 0, r0, c6, c2 @ set area 2, ROM/FLASH + + mov r0, #0x06 + mcr p15, 0, r0, c2, c0 @ Region 1&2 cacheable +#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 + + mov r0, #0x10000 + sub r0, r0, #1 @ r0 = 0xffff + mcr p15, 0, r0, c5, c0 @ all read/write access + + mrc p15, 0, r0, c1, c0 @ get control register + bic r0, r0, #0x3F000000 @ set to standard caching mode + @ need some benchmark + orr r0, r0, #0x0000000d @ MPU/Cache/WB + + ret lr + + .size __arm740_setup, . - __arm740_setup + + __INITDATA + + @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) + define_processor_functions arm740, dabort=v4t_late_abort, pabort=legacy_pabort, nommu=1 + + .section ".rodata" + + string cpu_arch_name, "armv4" + string cpu_elf_name, "v4" + string cpu_arm740_name, "ARM740T" + + .align + + .section ".proc.info.init", "a" + .type __arm740_proc_info,#object +__arm740_proc_info: + .long 0x41807400 + .long 0xfffffff0 + .long 0 + .long 0 + initfn __arm740_setup, __arm740_proc_info + .long cpu_arch_name + .long cpu_elf_name + .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_26BIT + .long cpu_arm740_name + .long arm740_processor_functions + .long 0 + .long 0 + .long v4_cache_fns @ cache model + .size __arm740_proc_info, . - __arm740_proc_info |