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https://github.com/brain-hackers/u-boot-brain
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![Baruch Siach](/assets/img/avatar_default.png)
Reduce Auto Voltage Scaling VDD limit when core frequency is lower than 1600MHz. This reduces core voltage level from 1.25V to 1.15V, which saves power. The code is taken from Marvell's U-Boot 2013.01 revision 18.06. Reviewed-by: Chris Packham <judge.packham@gmail.com> Tested-by: Chris Packham <judge.packham@gmail.com> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Stefan Roese <sr@denx.de>
154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2014-2016 Stefan Roese <sr@denx.de>
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*/
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#include <common.h>
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#include <dm.h>
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#include <debug_uart.h>
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#include <fdtdec.h>
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#include <spl.h>
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#include <asm/io.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/soc.h>
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static u32 get_boot_device(void)
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{
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u32 val;
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u32 boot_device;
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/*
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* First check, if UART boot-mode is active. This can only
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* be done, via the bootrom error register. Here the
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* MSB marks if the UART mode is active.
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*/
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val = readl(CONFIG_BOOTROM_ERR_REG);
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boot_device = (val & BOOTROM_ERR_MODE_MASK) >> BOOTROM_ERR_MODE_OFFS;
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debug("BOOTROM_REG=0x%08x boot_device=0x%x\n", val, boot_device);
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if (boot_device == BOOTROM_ERR_MODE_UART)
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return BOOT_DEVICE_UART;
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#ifdef CONFIG_ARMADA_38X
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/*
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* If the bootrom error code contains any other than zeros it's an
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* error condition and the bootROM has fallen back to UART boot
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*/
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boot_device = (val & BOOTROM_ERR_CODE_MASK) >> BOOTROM_ERR_CODE_OFFS;
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if (boot_device)
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return BOOT_DEVICE_UART;
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#endif
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/*
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* Now check the SAR register for the strapped boot-device
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*/
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val = readl(CONFIG_SAR_REG); /* SAR - Sample At Reset */
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boot_device = (val & BOOT_DEV_SEL_MASK) >> BOOT_DEV_SEL_OFFS;
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debug("SAR_REG=0x%08x boot_device=0x%x\n", val, boot_device);
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switch (boot_device) {
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#if defined(CONFIG_ARMADA_38X)
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case BOOT_FROM_NAND:
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return BOOT_DEVICE_NAND;
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#endif
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#ifdef CONFIG_SPL_MMC_SUPPORT
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case BOOT_FROM_MMC:
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case BOOT_FROM_MMC_ALT:
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return BOOT_DEVICE_MMC1;
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#endif
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case BOOT_FROM_UART:
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#ifdef BOOT_FROM_UART_ALT
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case BOOT_FROM_UART_ALT:
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#endif
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return BOOT_DEVICE_UART;
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#ifdef BOOT_FROM_SATA
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case BOOT_FROM_SATA:
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case BOOT_FROM_SATA_ALT:
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return BOOT_DEVICE_SATA;
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#endif
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case BOOT_FROM_SPI:
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default:
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return BOOT_DEVICE_SPI;
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};
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}
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u32 spl_boot_device(void)
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{
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return get_boot_device();
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}
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void board_init_f(ulong dummy)
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{
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int ret;
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/*
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* Pin muxing needs to be done before UART output, since
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* on A38x the UART pins need some re-muxing for output
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* to work.
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*/
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board_early_init_f();
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/* Example code showing how to enable the debug UART on MVEBU */
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#ifdef EARLY_UART
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/*
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* Debug UART can be used from here if required:
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*
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* debug_uart_init();
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* printch('a');
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* printhex8(0x1234);
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* printascii("string");
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*/
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#endif
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/*
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* Use special translation offset for SPL. This needs to be
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* configured *before* spl_init() is called as this function
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* calls dm_init() which calls the bind functions of the
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* device drivers. Here the base address needs to be configured
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* (translated) correctly.
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*/
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gd->translation_offset = 0xd0000000 - 0xf1000000;
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ret = spl_init();
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if (ret) {
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debug("spl_init() failed: %d\n", ret);
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hang();
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}
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preloader_console_init();
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timer_init();
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/* Armada 375 does not support SerDes and DDR3 init yet */
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#if !defined(CONFIG_ARMADA_375)
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/* First init the serdes PHY's */
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serdes_phy_config();
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/* Setup DDR */
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ddr3_init();
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#endif
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/* Initialize Auto Voltage Scaling */
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mv_avs_init();
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/*
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* Return to the BootROM to continue the Marvell xmodem
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* UART boot protocol. As initiated by the kwboot tool.
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*
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* This can only be done by the BootROM and not by the
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* U-Boot SPL infrastructure, since the beginning of the
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* image is already read and interpreted by the BootROM.
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* SPL has no chance to receive this information. So we
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* need to return to the BootROM to enable this xmodem
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* UART download.
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*
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* If booting from NAND lets let the BootROM load the
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* rest of the bootloader.
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*/
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switch (get_boot_device()) {
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case BOOT_DEVICE_UART:
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#if defined(CONFIG_ARMADA_38X)
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case BOOT_DEVICE_NAND:
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#endif
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return_to_bootrom();
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}
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}
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