103 lines
3 KiB
C
103 lines
3 KiB
C
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// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
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/*
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* Copyright (c) 2018 Microsemi Corporation
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/types.h>
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#include <mach/tlb.h>
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#include <mach/ddr.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if CONFIG_SYS_SDRAM_SIZE <= SZ_64M
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#define MSCC_RAM_TLB_SIZE SZ_64M
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#define MSCC_ATTRIB2 MMU_REGIO_INVAL
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#elif CONFIG_SYS_SDRAM_SIZE <= SZ_128M
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#define MSCC_RAM_TLB_SIZE SZ_64M
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#define MSCC_ATTRIB2 MMU_REGIO_RW
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#elif CONFIG_SYS_SDRAM_SIZE <= SZ_256M
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#define MSCC_RAM_TLB_SIZE SZ_256M
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#define MSCC_ATTRIB2 MMU_REGIO_INVAL
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#elif CONFIG_SYS_SDRAM_SIZE <= SZ_512M
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#define MSCC_RAM_TLB_SIZE SZ_256M
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#define MSCC_ATTRIB2 MMU_REGIO_RW
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#else
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#define MSCC_RAM_TLB_SIZE SZ_512M
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#define MSCC_ATTRIB2 MMU_REGIO_RW
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#endif
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/* NOTE: lowlevel_init() function does not have access to the
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* stack. Thus, all called functions must be inlined, and (any) local
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* variables must be kept in registers.
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*/
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void vcoreiii_tlb_init(void)
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{
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register int tlbix = 0;
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/*
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* Unlike most of the MIPS based SoCs, the IO register address
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* are not in KSEG0. The mainline linux kernel built in legacy
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* mode needs to access some of the registers very early in
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* the boot and make the assumption that the bootloader has
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* already configured them, so we have to match this
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* expectation.
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*/
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create_tlb(tlbix++, MSCC_IO_ORIGIN1_OFFSET, SZ_16M, MMU_REGIO_RW,
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MMU_REGIO_RW);
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#ifdef CONFIG_SOC_LUTON
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create_tlb(tlbix++, MSCC_IO_ORIGIN2_OFFSET, SZ_16M, MMU_REGIO_RW,
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MMU_REGIO_RW);
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#endif
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#if CONFIG_SYS_TEXT_BASE == MSCC_FLASH_TO
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/*
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* If U-Boot is located in NOR then we want to be able to use
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* the data cache in order to boot in a decent duration
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*/
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create_tlb(tlbix++, MSCC_FLASH_TO, SZ_16M, MMU_REGIO_RO_C,
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MMU_REGIO_RO_C);
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create_tlb(tlbix++, MSCC_FLASH_TO + SZ_32M, SZ_16M, MMU_REGIO_RO_C,
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MMU_REGIO_RO_C);
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/*
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* Using cache for RAM also helps to improve boot time. Thanks
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* to this the time to relocate U-Boot in RAM went from 2.092
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* secs to 0.104 secs.
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*/
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create_tlb(tlbix++, MSCC_DDR_TO, MSCC_RAM_TLB_SIZE, MMU_REGIO_RW,
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MSCC_ATTRIB2);
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/* Enable caches by clearing the bit ERL, which is set on reset */
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write_c0_status(read_c0_status() & ~BIT(2));
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#endif /* CONFIG_SYS_TEXT_BASE */
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}
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int mach_cpu_init(void)
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{
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/* Speed up NOR flash access */
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#ifdef CONFIG_SOC_LUTON
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writel(ICPU_PI_MST_CFG_TRISTATE_CTRL +
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ICPU_PI_MST_CFG_CLK_DIV(4), BASE_CFG + ICPU_PI_MST_CFG);
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writel(ICPU_SPI_MST_CFG_FAST_READ_ENA +
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ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
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ICPU_SPI_MST_CFG_CLK_DIV(9), BASE_CFG + ICPU_SPI_MST_CFG);
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#else
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writel(ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
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ICPU_SPI_MST_CFG_CLK_DIV(9), BASE_CFG + ICPU_SPI_MST_CFG);
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/*
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* Legacy and mainline linux kernel expect that the
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* interruption map was set as it was done by redboot.
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*/
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writel(~0, BASE_CFG + ICPU_DST_INTR_MAP(0));
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writel(0, BASE_CFG + ICPU_DST_INTR_MAP(1));
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writel(0, BASE_CFG + ICPU_DST_INTR_MAP(2));
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writel(0, BASE_CFG + ICPU_DST_INTR_MAP(3));
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#endif
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return 0;
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}
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