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https://github.com/brain-hackers/u-boot-brain
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7ce85318cf
omap-common cache enabling sequence relies on cpu_init_cp15() (inside start.S) for enabling I-caches. But cpu_init_cp15() can be skipped if CONFIG_SKIP_LOWLEVEL_INIT is defined. So enable I-caches if not enabled already. Debugged-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Tested-by: Steve Kipisz <s-kipisz2@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Tested-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
/*
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*
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* Common functions for OMAP4/5 based boards
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*
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* (C) Copyright 2010
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* Texas Instruments, <www.ti.com>
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*
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* Author :
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* Aneesh V <aneesh@ti.com>
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* Steve Sakoman <steve@sakoman.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/cache.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Without LPAE short descriptors are used
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* Set C - Cache Bit3
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* Set B - Buffer Bit2
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* The last 2 bits set to 0b10
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* Do Not set XN bit4
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* So value is 0xe
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*
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* With LPAE cache configuration happens via MAIR0 register
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* AttrIndx value is 0x3 for picking byte3 for MAIR0 which has 0xFF.
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* 0xFF maps to Cache writeback with Read and Write Allocate set
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* The bits[1:0] should have the value 0b01 for the first level
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* descriptor.
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* So the value is 0xd
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*/
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#ifdef CONFIG_ARMV7_LPAE
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#define ARMV7_DCACHE_POLICY DCACHE_WRITEALLOC
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#else
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#define ARMV7_DCACHE_POLICY DCACHE_WRITEBACK & ~TTB_SECT_XN_MASK
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#endif
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#define ARMV7_DOMAIN_CLIENT 1
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#define ARMV7_DOMAIN_MASK (0x3 << 0)
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void enable_caches(void)
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{
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/* Enable I cache if not enabled */
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if (!icache_status())
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icache_enable();
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dcache_enable();
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}
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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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u32 start = bd->bi_dram[bank].start >> MMU_SECTION_SHIFT;
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u32 size = bd->bi_dram[bank].size >> MMU_SECTION_SHIFT;
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u32 end = start + size;
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debug("%s: bank: %d\n", __func__, bank);
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for (i = start; i < end; i++)
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set_section_dcache(i, ARMV7_DCACHE_POLICY);
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}
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void arm_init_domains(void)
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{
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u32 reg;
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reg = get_dacr();
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/*
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* Set DOMAIN to client access so that all permissions
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* set in pagetables are validated by the mmu.
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*/
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reg &= ~ARMV7_DOMAIN_MASK;
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reg |= ARMV7_DOMAIN_CLIENT;
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set_dacr(reg);
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}
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