319 lines
7.0 KiB
C
319 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <asm/system.h>
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#include <asm/cache.h>
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#include <linux/compiler.h>
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#include <asm/armv7_mpu.h>
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#if !(CONFIG_IS_ENABLED(SYS_ICACHE_OFF) && CONFIG_IS_ENABLED(SYS_DCACHE_OFF))
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef CONFIG_SYS_ARM_MMU
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__weak void arm_init_before_mmu(void)
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{
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}
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__weak void arm_init_domains(void)
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{
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}
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void set_section_dcache(int section, enum dcache_option option)
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{
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#ifdef CONFIG_ARMV7_LPAE
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u64 *page_table = (u64 *)gd->arch.tlb_addr;
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/* Need to set the access flag to not fault */
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u64 value = TTB_SECT_AP | TTB_SECT_AF;
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#else
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u32 *page_table = (u32 *)gd->arch.tlb_addr;
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u32 value = TTB_SECT_AP;
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#endif
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/* Add the page offset */
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value |= ((u32)section << MMU_SECTION_SHIFT);
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/* Add caching bits */
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value |= option;
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/* Set PTE */
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page_table[section] = value;
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}
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__weak void mmu_page_table_flush(unsigned long start, unsigned long stop)
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{
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debug("%s: Warning: not implemented\n", __func__);
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}
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void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
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enum dcache_option option)
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{
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#ifdef CONFIG_ARMV7_LPAE
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u64 *page_table = (u64 *)gd->arch.tlb_addr;
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#else
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u32 *page_table = (u32 *)gd->arch.tlb_addr;
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#endif
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unsigned long startpt, stoppt;
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unsigned long upto, end;
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end = ALIGN(start + size, MMU_SECTION_SIZE) >> MMU_SECTION_SHIFT;
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start = start >> MMU_SECTION_SHIFT;
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#ifdef CONFIG_ARMV7_LPAE
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debug("%s: start=%pa, size=%zu, option=%llx\n", __func__, &start, size,
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option);
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#else
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debug("%s: start=%pa, size=%zu, option=0x%x\n", __func__, &start, size,
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option);
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#endif
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for (upto = start; upto < end; upto++)
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set_section_dcache(upto, option);
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/*
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* Make sure range is cache line aligned
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* Only CPU maintains page tables, hence it is safe to always
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* flush complete cache lines...
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*/
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startpt = (unsigned long)&page_table[start];
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startpt &= ~(CONFIG_SYS_CACHELINE_SIZE - 1);
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stoppt = (unsigned long)&page_table[end];
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stoppt = ALIGN(stoppt, CONFIG_SYS_CACHELINE_SIZE);
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mmu_page_table_flush(startpt, stoppt);
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}
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__weak void dram_bank_mmu_setup(int bank)
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{
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bd_t *bd = gd->bd;
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int i;
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debug("%s: bank: %d\n", __func__, bank);
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for (i = bd->bi_dram[bank].start >> MMU_SECTION_SHIFT;
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i < (bd->bi_dram[bank].start >> MMU_SECTION_SHIFT) +
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(bd->bi_dram[bank].size >> MMU_SECTION_SHIFT);
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i++) {
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#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
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set_section_dcache(i, DCACHE_WRITETHROUGH);
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#elif defined(CONFIG_SYS_ARM_CACHE_WRITEALLOC)
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set_section_dcache(i, DCACHE_WRITEALLOC);
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#else
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set_section_dcache(i, DCACHE_WRITEBACK);
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#endif
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}
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}
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/* to activate the MMU we need to set up virtual memory: use 1M areas */
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static inline void mmu_setup(void)
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{
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int i;
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u32 reg;
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arm_init_before_mmu();
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/* Set up an identity-mapping for all 4GB, rw for everyone */
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for (i = 0; i < ((4096ULL * 1024 * 1024) >> MMU_SECTION_SHIFT); i++)
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set_section_dcache(i, DCACHE_OFF);
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for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
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dram_bank_mmu_setup(i);
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}
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#if defined(CONFIG_ARMV7_LPAE) && __LINUX_ARM_ARCH__ != 4
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/* Set up 4 PTE entries pointing to our 4 1GB page tables */
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for (i = 0; i < 4; i++) {
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u64 *page_table = (u64 *)(gd->arch.tlb_addr + (4096 * 4));
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u64 tpt = gd->arch.tlb_addr + (4096 * i);
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page_table[i] = tpt | TTB_PAGETABLE;
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}
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reg = TTBCR_EAE;
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#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
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reg |= TTBCR_ORGN0_WT | TTBCR_IRGN0_WT;
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#elif defined(CONFIG_SYS_ARM_CACHE_WRITEALLOC)
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reg |= TTBCR_ORGN0_WBWA | TTBCR_IRGN0_WBWA;
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#else
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reg |= TTBCR_ORGN0_WBNWA | TTBCR_IRGN0_WBNWA;
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#endif
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if (is_hyp()) {
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/* Set HTCR to enable LPAE */
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asm volatile("mcr p15, 4, %0, c2, c0, 2"
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: : "r" (reg) : "memory");
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/* Set HTTBR0 */
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asm volatile("mcrr p15, 4, %0, %1, c2"
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:
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: "r"(gd->arch.tlb_addr + (4096 * 4)), "r"(0)
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: "memory");
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/* Set HMAIR */
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asm volatile("mcr p15, 4, %0, c10, c2, 0"
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: : "r" (MEMORY_ATTRIBUTES) : "memory");
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} else {
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/* Set TTBCR to enable LPAE */
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asm volatile("mcr p15, 0, %0, c2, c0, 2"
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: : "r" (reg) : "memory");
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/* Set 64-bit TTBR0 */
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asm volatile("mcrr p15, 0, %0, %1, c2"
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:
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: "r"(gd->arch.tlb_addr + (4096 * 4)), "r"(0)
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: "memory");
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/* Set MAIR */
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asm volatile("mcr p15, 0, %0, c10, c2, 0"
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: : "r" (MEMORY_ATTRIBUTES) : "memory");
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}
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#elif defined(CONFIG_CPU_V7A)
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if (is_hyp()) {
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/* Set HTCR to disable LPAE */
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asm volatile("mcr p15, 4, %0, c2, c0, 2"
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: : "r" (0) : "memory");
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} else {
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/* Set TTBCR to disable LPAE */
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asm volatile("mcr p15, 0, %0, c2, c0, 2"
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: : "r" (0) : "memory");
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}
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/* Set TTBR0 */
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reg = gd->arch.tlb_addr & TTBR0_BASE_ADDR_MASK;
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#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
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reg |= TTBR0_RGN_WT | TTBR0_IRGN_WT;
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#elif defined(CONFIG_SYS_ARM_CACHE_WRITEALLOC)
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reg |= TTBR0_RGN_WBWA | TTBR0_IRGN_WBWA;
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#else
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reg |= TTBR0_RGN_WB | TTBR0_IRGN_WB;
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#endif
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asm volatile("mcr p15, 0, %0, c2, c0, 0"
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: : "r" (reg) : "memory");
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#else
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/* Copy the page table address to cp15 */
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asm volatile("mcr p15, 0, %0, c2, c0, 0"
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: : "r" (gd->arch.tlb_addr) : "memory");
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#endif
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/* Set the access control to all-supervisor */
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asm volatile("mcr p15, 0, %0, c3, c0, 0"
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: : "r" (~0));
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arm_init_domains();
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/* and enable the mmu */
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reg = get_cr(); /* get control reg. */
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set_cr(reg | CR_M);
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}
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static int mmu_enabled(void)
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{
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return get_cr() & CR_M;
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}
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#endif /* CONFIG_SYS_ARM_MMU */
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/* cache_bit must be either CR_I or CR_C */
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static void cache_enable(uint32_t cache_bit)
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{
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uint32_t reg;
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/* The data cache is not active unless the mmu/mpu is enabled too */
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#ifdef CONFIG_SYS_ARM_MMU
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if ((cache_bit == CR_C) && !mmu_enabled())
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mmu_setup();
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#elif defined(CONFIG_SYS_ARM_MPU)
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if ((cache_bit == CR_C) && !mpu_enabled()) {
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printf("Consider enabling MPU before enabling caches\n");
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return;
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}
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#endif
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reg = get_cr(); /* get control reg. */
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set_cr(reg | cache_bit);
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}
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/* cache_bit must be either CR_I or CR_C */
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static void cache_disable(uint32_t cache_bit)
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{
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uint32_t reg;
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reg = get_cr();
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if (cache_bit == CR_C) {
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/* if cache isn;t enabled no need to disable */
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if ((reg & CR_C) != CR_C)
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return;
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#ifdef CONFIG_SYS_ARM_MMU
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/* if disabling data cache, disable mmu too */
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cache_bit |= CR_M;
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#endif
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}
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reg = get_cr();
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#ifdef CONFIG_SYS_ARM_MMU
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if (cache_bit == (CR_C | CR_M))
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#elif defined(CONFIG_SYS_ARM_MPU)
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if (cache_bit == CR_C)
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#endif
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flush_dcache_all();
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set_cr(reg & ~cache_bit);
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}
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#endif
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#if CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
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void icache_enable(void)
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{
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return;
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}
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void icache_disable(void)
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{
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return;
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}
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int icache_status(void)
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{
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return 0; /* always off */
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}
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#else
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void icache_enable(void)
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{
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cache_enable(CR_I);
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}
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void icache_disable(void)
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{
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cache_disable(CR_I);
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}
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int icache_status(void)
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{
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return (get_cr() & CR_I) != 0;
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}
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#endif
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#if CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
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void dcache_enable(void)
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{
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return;
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}
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void dcache_disable(void)
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{
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return;
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}
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int dcache_status(void)
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{
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return 0; /* always off */
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}
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#else
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void dcache_enable(void)
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{
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cache_enable(CR_C);
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}
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void dcache_disable(void)
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{
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cache_disable(CR_C);
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}
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int dcache_status(void)
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{
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return (get_cr() & CR_C) != 0;
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}
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#endif
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