arm64-common.c
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/*
* Copyright (C) 2016 Stefan Roese <sr@denx.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <linux/libfdt.h>
#include <pci.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>
#include <asm/armv8/mmu.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* Not all memory is mapped in the MMU. So we need to restrict the
* memory size so that U-Boot does not try to access it. Also, the
* internal registers are located at 0xf000.0000 - 0xffff.ffff.
* Currently only 2GiB are mapped for system memory. This is what
* we pass to the U-Boot subsystem here.
*/
#define USABLE_RAM_SIZE 0x80000000
ulong board_get_usable_ram_top(ulong total_size)
{
if (gd->ram_size > USABLE_RAM_SIZE)
return USABLE_RAM_SIZE;
return gd->ram_size;
}
/*
* On ARMv8, MBus is not configured in U-Boot. To enable compilation
* of the already implemented drivers, lets add a dummy version of
* this function so that linking does not fail.
*/
const struct mbus_dram_target_info *mvebu_mbus_dram_info(void)
{
return NULL;
}
/* DRAM init code ... */
int dram_init_banksize(void)
{
fdtdec_setup_memory_banksize();
return 0;
}
int dram_init(void)
{
if (fdtdec_setup_memory_size() != 0)
return -EINVAL;
return 0;
}
int arch_cpu_init(void)
{
/* Nothing to do (yet) */
return 0;
}
int arch_early_init_r(void)
{
struct udevice *dev;
int ret;
int i;
/*
* Loop over all MISC uclass drivers to call the comphy code
* and init all CP110 devices enabled in the DT
*/
i = 0;
while (1) {
/* Call the comphy code via the MISC uclass driver */
ret = uclass_get_device(UCLASS_MISC, i++, &dev);
/* We're done, once no further CP110 device is found */
if (ret)
break;
}
/* Cause the SATA device to do its early init */
uclass_first_device(UCLASS_AHCI, &dev);
#ifdef CONFIG_DM_PCI
/* Trigger PCIe devices detection */
pci_init();
#endif
return 0;
}