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Diffstat (limited to 'arch/arm/mm/proc-sa1100.S')
| -rw-r--r-- | arch/arm/mm/proc-sa1100.S | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-sa1100.S b/arch/arm/mm/proc-sa1100.S new file mode 100644 index 000000000..e723bd411 --- /dev/null +++ b/arch/arm/mm/proc-sa1100.S @@ -0,0 +1,270 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/arch/arm/mm/proc-sa1100.S + * + * Copyright (C) 1997-2002 Russell King + * hacked for non-paged-MM by Hyok S. Choi, 2003. + * + * MMU functions for SA110 + * + * These are the low level assembler for performing cache and TLB + * functions on the StrongARM-1100 and StrongARM-1110. + * + * Note that SA1100 and SA1110 share everything but their name and CPU ID. + * + * 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl): + * Flush the read buffer at context switches + */ +#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 <mach/hardware.h> +#include <asm/pgtable-hwdef.h> + +#include "proc-macros.S" + +/* + * the cache line size of the I and D cache + */ +#define DCACHELINESIZE 32 + + .section .text + +/* + * cpu_sa1100_proc_init() + */ +ENTRY(cpu_sa1100_proc_init) + mov r0, #0 + mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching + mcr p15, 0, r0, c9, c0, 5 @ Allow read-buffer operations from userland + ret lr + +/* + * cpu_sa1100_proc_fin() + * + * Prepare the CPU for reset: + * - Disable interrupts + * - Clean and turn off caches. + */ +ENTRY(cpu_sa1100_proc_fin) + mcr p15, 0, ip, 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 + ret lr + +/* + * cpu_sa1100_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 + .pushsection .idmap.text, "ax" +ENTRY(cpu_sa1100_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 + ret r0 +ENDPROC(cpu_sa1100_reset) + .popsection + +/* + * cpu_sa1100_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_sa1100_do_idle) + mov r0, r0 @ 4 nop padding + mov r0, r0 + mov r0, r0 + mov r0, r0 @ 4 nop padding + mov r0, r0 + mov r0, r0 + mov r0, #0 + ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address + @ --- aligned to a cache line + mcr p15, 0, r0, c15, c2, 2 @ disable clock switching + ldr r1, [r1, #0] @ force switch to MCLK + mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt + mov r0, r0 @ safety + mcr p15, 0, r0, c15, c1, 2 @ enable clock switching + ret lr + +/* ================================= CACHE ================================ */ + +/* + * cpu_sa1100_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_sa1100_dcache_clean_area) +1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry + add r0, r0, #DCACHELINESIZE + subs r1, r1, #DCACHELINESIZE + bhi 1b + ret lr + +/* =============================== PageTable ============================== */ + +/* + * cpu_sa1100_switch_mm(pgd) + * + * Set the translation base pointer to be as described by pgd. + * + * pgd: new page tables + */ + .align 5 +ENTRY(cpu_sa1100_switch_mm) +#ifdef CONFIG_MMU + str lr, [sp, #-4]! + bl v4wb_flush_kern_cache_all @ clears IP + mcr p15, 0, ip, c9, c0, 0 @ invalidate RB + mcr p15, 0, r0, c2, c0, 0 @ load page table pointer + mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs + ldr pc, [sp], #4 +#else + ret lr +#endif + +/* + * cpu_sa1100_set_pte_ext(ptep, pte, ext) + * + * Set a PTE and flush it out + */ + .align 5 +ENTRY(cpu_sa1100_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 + mcr p15, 0, r0, c7, c10, 4 @ drain WB +#endif + ret lr + +.globl cpu_sa1100_suspend_size +.equ cpu_sa1100_suspend_size, 4 * 3 +#ifdef CONFIG_ARM_CPU_SUSPEND +ENTRY(cpu_sa1100_do_suspend) + stmfd sp!, {r4 - r6, lr} + mrc p15, 0, r4, c3, c0, 0 @ domain ID + mrc p15, 0, r5, c13, c0, 0 @ PID + mrc p15, 0, r6, c1, c0, 0 @ control reg + stmia r0, {r4 - r6} @ store cp regs + ldmfd sp!, {r4 - r6, pc} +ENDPROC(cpu_sa1100_do_suspend) + +ENTRY(cpu_sa1100_do_resume) + ldmia r0, {r4 - r6} @ load cp regs + mov ip, #0 + mcr p15, 0, ip, c8, c7, 0 @ flush I+D TLBs + mcr p15, 0, ip, c7, c7, 0 @ flush I&D cache + mcr p15, 0, ip, c9, c0, 0 @ invalidate RB + mcr p15, 0, ip, c9, c0, 5 @ allow user space to use RB + + mcr p15, 0, r4, c3, c0, 0 @ domain ID + mcr p15, 0, r1, c2, c0, 0 @ translation table base addr + mcr p15, 0, r5, c13, c0, 0 @ PID + mov r0, r6 @ control register + b cpu_resume_mmu +ENDPROC(cpu_sa1100_do_resume) +#endif + + .type __sa1100_setup, #function +__sa1100_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, sa1100_crval + ldmia r5, {r5, r6} + mrc p15, 0, r0, c1, c0 @ get control register v4 + bic r0, r0, r5 + orr r0, r0, r6 + ret lr + .size __sa1100_setup, . - __sa1100_setup + + /* + * R + * .RVI ZFRS BLDP WCAM + * ..11 0001 ..11 1101 + * + */ + .type sa1100_crval, #object +sa1100_crval: + crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130 + + __INITDATA + +/* + * SA1100 and SA1110 share the same function calls + */ + + @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) + define_processor_functions sa1100, dabort=v4_early_abort, pabort=legacy_pabort, suspend=1 + + .section ".rodata" + + string cpu_arch_name, "armv4" + string cpu_elf_name, "v4" + string cpu_sa1100_name, "StrongARM-1100" + string cpu_sa1110_name, "StrongARM-1110" + + .align + + .section ".proc.info.init", "a" + +.macro sa1100_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req + .type __\name\()_proc_info,#object +__\name\()_proc_info: + .long \cpu_val + .long \cpu_mask + .long PMD_TYPE_SECT | \ + PMD_SECT_BUFFERABLE | \ + PMD_SECT_CACHEABLE | \ + PMD_SECT_AP_WRITE | \ + PMD_SECT_AP_READ + .long PMD_TYPE_SECT | \ + PMD_SECT_AP_WRITE | \ + PMD_SECT_AP_READ + initfn __sa1100_setup, __\name\()_proc_info + .long cpu_arch_name + .long cpu_elf_name + .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT + .long \cpu_name + .long sa1100_processor_functions + .long v4wb_tlb_fns + .long v4_mc_user_fns + .long v4wb_cache_fns + .size __\name\()_proc_info, . - __\name\()_proc_info +.endm + + sa1100_proc_info sa1100, 0x4401a110, 0xfffffff0, cpu_sa1100_name + sa1100_proc_info sa1110, 0x6901b110, 0xfffffff0, cpu_sa1110_name |