arch/arm/mach-snapdragon/board.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Common initialisation for Qualcomm Snapdragon boards.
 *
 * Copyright (c) 2023 Linaro Ltd.
 * Author: Caleb Connolly <caleb.connolly@linaro.org>
 */

#define LOG_DEBUG

#include <asm/armv8/mmu.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/psci.h>
#include <asm/system.h>
#include <dm/device.h>
#include <env.h>
#include <init.h>
#include <linux/arm-smccc.h>
#include <linux/bug.h>
#include <linux/psci.h>
#include <linux/sizes.h>
#include <malloc.h>

DECLARE_GLOBAL_DATA_PTR;

static struct mm_region rbx_mem_map[CONFIG_NR_DRAM_BANKS + 2] = { { 0 } };

struct mm_region *mem_map = rbx_mem_map;

int dram_init(void)
{
	return fdtdec_setup_mem_size_base();
}

int dram_init_banksize(void)
{
	int ret;
	phys_addr_t start, size;

	ret = fdtdec_setup_memory_banksize();
	if (ret < 0)
		return ret;

	if (WARN(CONFIG_NR_DRAM_BANKS < 2, "CONFIG_NR_DRAM_BANKS should be at least 2"))
		return 0;

	/* Some bootloaders populate the RAM banks in the wrong order -_- */
	start = gd->bd->bi_dram[1].start;
	size = gd->bd->bi_dram[1].size;
	if (size && start < gd->bd->bi_dram[0].start) {
		debug("Swapping DRAM banks\n");
		gd->bd->bi_dram[1].start = gd->bd->bi_dram[0].start;
		gd->bd->bi_dram[1].size = gd->bd->bi_dram[0].size;
		gd->bd->bi_dram[0].start = start;
		gd->bd->bi_dram[0].size = size;
	}

	return 0;
}

static void show_psci_version(void)
{
	struct arm_smccc_res res;

	arm_smccc_smc(ARM_PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0, 0, 0, 0, 0, &res);

	debug("PSCI:  v%ld.%ld\n",
	      PSCI_VERSION_MAJOR(res.a0),
	      PSCI_VERSION_MINOR(res.a0));
}

void *board_fdt_blob_setup(int *err)
{
	phys_addr_t fdt;
	/* Return DTB pointer passed by ABL */
	*err = 0;
	fdt = get_prev_bl_fdt_addr();

	/*
	 * If we bail then the board will simply not boot, instead let's
	 * try and use the FDT built into U-Boot if there is one...
	 * This avoids having a hard dependency on the previous stage bootloader
	 */
	if (IS_ENABLED(CONFIG_OF_SEPARATE) && (!fdt || fdt != ALIGN(fdt, SZ_4K))) {
		debug("%s: Using built in FDT, bootloader gave us %#llx\n", __func__, fdt);
		return (void *)gd->fdt_blob;
	}

	return (void *)fdt;
}

void reset_cpu(void)
{
	psci_system_reset();
}

/*
 * Some boards still need board specific init code, they can implement that by
 * overriding this function.
 *
 * FIXME: get rid of board specific init code
 */
void __weak qcom_board_init(void)
{
}

int board_init(void)
{
	show_psci_version();
	qcom_board_init();
	return 0;
}

static void build_mem_map(void)
{
	int i;

	/*
	 * Ensure the peripheral block is sized to correctly cover the address range
	 * up to the first memory bank.
	 * Don't map the first page to ensure that we actually trigger an abort on a
	 * null pointer access rather than just hanging.
	 * FIXME: we should probably split this into more precise regions
	 */
	mem_map[0].phys = 0x1000;
	mem_map[0].virt = mem_map[0].phys;
	mem_map[0].size = gd->bd->bi_dram[0].start - mem_map[0].phys;
	mem_map[0].attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
			 PTE_BLOCK_NON_SHARE |
			 PTE_BLOCK_PXN | PTE_BLOCK_UXN;

	debug("Configured memory map:\n");
	debug("  0x%016llx - 0x%016llx: Peripheral block\n",
	      mem_map[0].phys, mem_map[0].phys + mem_map[0].size);

	/*
	 * Now add memory map entries for each DRAM bank, ensuring we don't
	 * overwrite the list terminator
	 */
	for (i = 0; i < ARRAY_SIZE(rbx_mem_map) - 2 && gd->bd->bi_dram[i].size; i++) {
		if (i == ARRAY_SIZE(rbx_mem_map) - 1) {
			log_warning("Too many DRAM banks!\n");
			break;
		}
		mem_map[i + 1].phys = gd->bd->bi_dram[i].start;
		mem_map[i + 1].virt = mem_map[i + 1].phys;
		mem_map[i + 1].size = gd->bd->bi_dram[i].size;
		mem_map[i + 1].attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
				     PTE_BLOCK_INNER_SHARE;

		debug("  0x%016llx - 0x%016llx: DDR bank %d\n",
		      mem_map[i + 1].phys, mem_map[i + 1].phys + mem_map[i + 1].size, i);
	}
}

u64 get_page_table_size(void)
{
	return SZ_64K;
}

void enable_caches(void)
{
	build_mem_map();

	icache_enable();
	dcache_enable();
}