/* * linux/arch/arm/mm/proc-sa1100.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-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 #include #include #include #include #include #include /* * the cache line size of the I and D cache */ #define DCACHELINESIZE 32 #define FLUSH_OFFSET 32768 .macro flush_1100_dcache rd, ra, re ldr \rd, =flush_base ldr \ra, [\rd] eor \ra, \ra, #FLUSH_OFFSET str \ra, [\rd] add \re, \ra, #8192 @ only necessary for 8k 1001: ldr \rd, [\ra], #DCACHELINESIZE teq \re, \ra bne 1001b #ifdef FLUSH_BASE_MINICACHE add \ra, \ra, #FLUSH_BASE_MINICACHE - FLUSH_BASE add \re, \ra, #512 @ only 512 bytes 1002: ldr \rd, [\ra], #DCACHELINESIZE teq \re, \ra bne 1002b #endif .endm .data flush_base: .long FLUSH_BASE .text __INIT /* * 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 mov pc, lr .previous /* * cpu_sa1100_proc_fin() * * Prepare the CPU for reset: * - Disable interrupts * - Clean and turn off caches. */ ENTRY(cpu_sa1100_proc_fin) stmfd sp!, {lr} mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE msr cpsr_c, ip flush_1100_dcache r0, r1, r2 @ clean caches 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_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 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 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_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 mov pc, 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 mov pc, 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) flush_1100_dcache r3, ip, r1 mov ip, #0 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache mcr p15, 0, ip, c9, c0, 0 @ invalidate RB mcr p15, 0, ip, c7, c10, 4 @ drain WB mcr p15, 0, r0, c2, c0, 0 @ load page table pointer mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs mov pc, lr /* * cpu_sa1100_set_pte(ptep, pte) * * Set a PTE and flush it out */ .align 5 ENTRY(cpu_sa1100_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 __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 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 mrc p15, 0, r0, c1, c0 @ get control register v4 ldr r5, sa1100_cr1_clear bic r0, r0, r5 ldr r5, sa1100_cr1_set orr r0, r0, r5 mov pc, lr .size __sa1100_setup, . - __sa1100_setup /* * R * .RVI ZFRS BLDP WCAM * ..11 0001 ..11 1101 * */ .type sa1100_cr1_clear, #object .type sa1100_cr1_set, #object sa1100_cr1_clear: .word 0x3f3f sa1100_cr1_set: .word 0x313d __INITDATA /* * Purpose : Function pointers used to access above functions - all calls * come through these */ /* * SA1100 and SA1110 share the same function calls */ .type sa1100_processor_functions, #object ENTRY(sa1100_processor_functions) .word v4_early_abort .word cpu_sa1100_proc_init .word cpu_sa1100_proc_fin .word cpu_sa1100_reset .word cpu_sa1100_do_idle .word cpu_sa1100_dcache_clean_area .word cpu_sa1100_switch_mm .word cpu_sa1100_set_pte .size sa1100_processor_functions, . - sa1100_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_sa1100_name, #object cpu_sa1100_name: .asciz "StrongARM-1100" .size cpu_sa1100_name, . - cpu_sa1100_name .type cpu_sa1110_name, #object cpu_sa1110_name: .asciz "StrongARM-1110" .size cpu_sa1110_name, . - cpu_sa1110_name .align .section ".proc.info", #alloc, #execinstr .type __sa1100_proc_info,#object __sa1100_proc_info: .long 0x4401a110 .long 0xfffffff0 .long PMD_TYPE_SECT | \ PMD_SECT_BUFFERABLE | \ PMD_SECT_CACHEABLE | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ b __sa1100_setup .long cpu_arch_name .long cpu_elf_name .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT .long cpu_sa1100_name .long sa1100_processor_functions .long v4wb_tlb_fns .long v4_mc_user_fns .long v4wb_cache_fns .size __sa1100_proc_info, . - __sa1100_proc_info .type __sa1110_proc_info,#object __sa1110_proc_info: .long 0x6901b110 .long 0xfffffff0 .long PMD_TYPE_SECT | \ PMD_SECT_BUFFERABLE | \ PMD_SECT_CACHEABLE | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ b __sa1100_setup .long cpu_arch_name .long cpu_elf_name .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT .long cpu_sa1110_name .long sa1100_processor_functions .long v4wb_tlb_fns .long v4_mc_user_fns .long v4wb_cache_fns .size __sa1110_proc_info, . - __sa1110_proc_info