X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=arch%2Farm%2Flib%2Fcache-cp15.c;h=d15144188bf9f623761f7d7d6a23c1bbfec43556;hb=2e8d68e241b35d383a057b014287a756624a32bc;hp=0291afa7bd531088f441808e9f9767cceb4d774b;hpb=6393c43c18a1aadcdcdd8551826eef15f50353d5;p=oweals%2Fu-boot.git diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c index 0291afa7bd..d15144188b 100644 --- a/arch/arm/lib/cache-cp15.c +++ b/arch/arm/lib/cache-cp15.c @@ -1,19 +1,21 @@ +// SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2002 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. - * - * SPDX-License-Identifier: GPL-2.0+ */ #include +#include #include #include #include +#include -#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF)) +#if !(CONFIG_IS_ENABLED(SYS_ICACHE_OFF) && CONFIG_IS_ENABLED(SYS_DCACHE_OFF)) DECLARE_GLOBAL_DATA_PTR; +#ifdef CONFIG_SYS_ARM_MMU __weak void arm_init_before_mmu(void) { } @@ -22,23 +24,24 @@ __weak void arm_init_domains(void) { } -static void cp_delay (void) -{ - volatile int i; - - /* copro seems to need some delay between reading and writing */ - for (i = 0; i < 100; i++) - nop(); - asm volatile("" : : : "memory"); -} - void set_section_dcache(int section, enum dcache_option option) { +#ifdef CONFIG_ARMV7_LPAE + u64 *page_table = (u64 *)gd->arch.tlb_addr; + /* Need to set the access flag to not fault */ + u64 value = TTB_SECT_AP | TTB_SECT_AF; +#else u32 *page_table = (u32 *)gd->arch.tlb_addr; - u32 value; + u32 value = TTB_SECT_AP; +#endif - value = (section << MMU_SECTION_SHIFT) | (3 << 10); + /* Add the page offset */ + value |= ((u32)section << MMU_SECTION_SHIFT); + + /* Add caching bits */ value |= option; + + /* Set PTE */ page_table[section] = value; } @@ -50,16 +53,37 @@ __weak void mmu_page_table_flush(unsigned long start, unsigned long stop) void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size, enum dcache_option option) { +#ifdef CONFIG_ARMV7_LPAE + u64 *page_table = (u64 *)gd->arch.tlb_addr; +#else u32 *page_table = (u32 *)gd->arch.tlb_addr; +#endif + unsigned long startpt, stoppt; unsigned long upto, end; end = ALIGN(start + size, MMU_SECTION_SIZE) >> MMU_SECTION_SHIFT; start = start >> MMU_SECTION_SHIFT; - debug("%s: start=%pa, size=%zu, option=%d\n", __func__, &start, size, +#ifdef CONFIG_ARMV7_LPAE + debug("%s: start=%pa, size=%zu, option=%llx\n", __func__, &start, size, + option); +#else + debug("%s: start=%pa, size=%zu, option=0x%x\n", __func__, &start, size, option); +#endif for (upto = start; upto < end; upto++) set_section_dcache(upto, option); - mmu_page_table_flush((u32)&page_table[start], (u32)&page_table[end]); + + /* + * Make sure range is cache line aligned + * Only CPU maintains page tables, hence it is safe to always + * flush complete cache lines... + */ + + startpt = (unsigned long)&page_table[start]; + startpt &= ~(CONFIG_SYS_CACHELINE_SIZE - 1); + stoppt = (unsigned long)&page_table[end]; + stoppt = ALIGN(stoppt, CONFIG_SYS_CACHELINE_SIZE); + mmu_page_table_flush(startpt, stoppt); } __weak void dram_bank_mmu_setup(int bank) @@ -67,18 +91,16 @@ __weak void dram_bank_mmu_setup(int bank) bd_t *bd = gd->bd; int i; + /* bd->bi_dram is available only after relocation */ + if ((gd->flags & GD_FLG_RELOC) == 0) + return; + debug("%s: bank: %d\n", __func__, bank); - for (i = bd->bi_dram[bank].start >> 20; - i < (bd->bi_dram[bank].start >> 20) + (bd->bi_dram[bank].size >> 20); - i++) { -#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH) - set_section_dcache(i, DCACHE_WRITETHROUGH); -#elif defined(CONFIG_SYS_ARM_CACHE_WRITEALLOC) - set_section_dcache(i, DCACHE_WRITEALLOC); -#else - set_section_dcache(i, DCACHE_WRITEBACK); -#endif - } + for (i = bd->bi_dram[bank].start >> MMU_SECTION_SHIFT; + i < (bd->bi_dram[bank].start >> MMU_SECTION_SHIFT) + + (bd->bi_dram[bank].size >> MMU_SECTION_SHIFT); + i++) + set_section_dcache(i, DCACHE_DEFAULT_OPTION); } /* to activate the MMU we need to set up virtual memory: use 1M areas */ @@ -89,16 +111,81 @@ static inline void mmu_setup(void) arm_init_before_mmu(); /* Set up an identity-mapping for all 4GB, rw for everyone */ - for (i = 0; i < 4096; i++) + for (i = 0; i < ((4096ULL * 1024 * 1024) >> MMU_SECTION_SHIFT); i++) set_section_dcache(i, DCACHE_OFF); for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { dram_bank_mmu_setup(i); } +#if defined(CONFIG_ARMV7_LPAE) && __LINUX_ARM_ARCH__ != 4 + /* Set up 4 PTE entries pointing to our 4 1GB page tables */ + for (i = 0; i < 4; i++) { + u64 *page_table = (u64 *)(gd->arch.tlb_addr + (4096 * 4)); + u64 tpt = gd->arch.tlb_addr + (4096 * i); + page_table[i] = tpt | TTB_PAGETABLE; + } + + reg = TTBCR_EAE; +#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH) + reg |= TTBCR_ORGN0_WT | TTBCR_IRGN0_WT; +#elif defined(CONFIG_SYS_ARM_CACHE_WRITEALLOC) + reg |= TTBCR_ORGN0_WBWA | TTBCR_IRGN0_WBWA; +#else + reg |= TTBCR_ORGN0_WBNWA | TTBCR_IRGN0_WBNWA; +#endif + + if (is_hyp()) { + /* Set HTCR to enable LPAE */ + asm volatile("mcr p15, 4, %0, c2, c0, 2" + : : "r" (reg) : "memory"); + /* Set HTTBR0 */ + asm volatile("mcrr p15, 4, %0, %1, c2" + : + : "r"(gd->arch.tlb_addr + (4096 * 4)), "r"(0) + : "memory"); + /* Set HMAIR */ + asm volatile("mcr p15, 4, %0, c10, c2, 0" + : : "r" (MEMORY_ATTRIBUTES) : "memory"); + } else { + /* Set TTBCR to enable LPAE */ + asm volatile("mcr p15, 0, %0, c2, c0, 2" + : : "r" (reg) : "memory"); + /* Set 64-bit TTBR0 */ + asm volatile("mcrr p15, 0, %0, %1, c2" + : + : "r"(gd->arch.tlb_addr + (4096 * 4)), "r"(0) + : "memory"); + /* Set MAIR */ + asm volatile("mcr p15, 0, %0, c10, c2, 0" + : : "r" (MEMORY_ATTRIBUTES) : "memory"); + } +#elif defined(CONFIG_CPU_V7A) + if (is_hyp()) { + /* Set HTCR to disable LPAE */ + asm volatile("mcr p15, 4, %0, c2, c0, 2" + : : "r" (0) : "memory"); + } else { + /* Set TTBCR to disable LPAE */ + asm volatile("mcr p15, 0, %0, c2, c0, 2" + : : "r" (0) : "memory"); + } + /* Set TTBR0 */ + reg = gd->arch.tlb_addr & TTBR0_BASE_ADDR_MASK; +#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH) + reg |= TTBR0_RGN_WT | TTBR0_IRGN_WT; +#elif defined(CONFIG_SYS_ARM_CACHE_WRITEALLOC) + reg |= TTBR0_RGN_WBWA | TTBR0_IRGN_WBWA; +#else + reg |= TTBR0_RGN_WB | TTBR0_IRGN_WB; +#endif + asm volatile("mcr p15, 0, %0, c2, c0, 0" + : : "r" (reg) : "memory"); +#else /* Copy the page table address to cp15 */ asm volatile("mcr p15, 0, %0, c2, c0, 0" : : "r" (gd->arch.tlb_addr) : "memory"); +#endif /* Set the access control to all-supervisor */ asm volatile("mcr p15, 0, %0, c3, c0, 0" : : "r" (~0)); @@ -107,7 +194,6 @@ static inline void mmu_setup(void) /* and enable the mmu */ reg = get_cr(); /* get control reg. */ - cp_delay(); set_cr(reg | CR_M); } @@ -115,17 +201,24 @@ static int mmu_enabled(void) { return get_cr() & CR_M; } +#endif /* CONFIG_SYS_ARM_MMU */ /* cache_bit must be either CR_I or CR_C */ static void cache_enable(uint32_t cache_bit) { uint32_t reg; - /* The data cache is not active unless the mmu is enabled too */ + /* The data cache is not active unless the mmu/mpu is enabled too */ +#ifdef CONFIG_SYS_ARM_MMU if ((cache_bit == CR_C) && !mmu_enabled()) mmu_setup(); +#elif defined(CONFIG_SYS_ARM_MPU) + if ((cache_bit == CR_C) && !mpu_enabled()) { + printf("Consider enabling MPU before enabling caches\n"); + return; + } +#endif reg = get_cr(); /* get control reg. */ - cp_delay(); set_cr(reg | cache_bit); } @@ -135,35 +228,40 @@ static void cache_disable(uint32_t cache_bit) uint32_t reg; reg = get_cr(); - cp_delay(); if (cache_bit == CR_C) { /* if cache isn;t enabled no need to disable */ if ((reg & CR_C) != CR_C) return; +#ifdef CONFIG_SYS_ARM_MMU /* if disabling data cache, disable mmu too */ cache_bit |= CR_M; +#endif } reg = get_cr(); - cp_delay(); + +#ifdef CONFIG_SYS_ARM_MMU if (cache_bit == (CR_C | CR_M)) +#elif defined(CONFIG_SYS_ARM_MPU) + if (cache_bit == CR_C) +#endif flush_dcache_all(); set_cr(reg & ~cache_bit); } #endif -#ifdef CONFIG_SYS_ICACHE_OFF -void icache_enable (void) +#if CONFIG_IS_ENABLED(SYS_ICACHE_OFF) +void icache_enable(void) { return; } -void icache_disable (void) +void icache_disable(void) { return; } -int icache_status (void) +int icache_status(void) { return 0; /* always off */ } @@ -184,18 +282,18 @@ int icache_status(void) } #endif -#ifdef CONFIG_SYS_DCACHE_OFF -void dcache_enable (void) +#if CONFIG_IS_ENABLED(SYS_DCACHE_OFF) +void dcache_enable(void) { return; } -void dcache_disable (void) +void dcache_disable(void) { return; } -int dcache_status (void) +int dcache_status(void) { return 0; /* always off */ }