u-boot/arch/arm/mach-imx/imx8/cpu.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2018 NXP
 */

#include <common.h>
#include <clk.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/uclass.h>
#include <errno.h>
#include <asm/arch/sci/sci.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch-imx/cpu.h>
#include <asm/armv8/cpu.h>
#include <asm/armv8/mmu.h>
#include <asm/mach-imx/boot_mode.h>

DECLARE_GLOBAL_DATA_PTR;

u32 get_cpu_rev(void)
{
	u32 id = 0, rev = 0;
	int ret;

	ret = sc_misc_get_control(-1, SC_R_SYSTEM, SC_C_ID, &id);
	if (ret)
		return 0;

	rev = (id >> 5)  & 0xf;
	id = (id & 0x1f) + MXC_SOC_IMX8;  /* Dummy ID for chip */

	return (id << 12) | rev;
}

#ifdef CONFIG_DISPLAY_CPUINFO
const char *get_imx8_type(u32 imxtype)
{
	switch (imxtype) {
	case MXC_CPU_IMX8QXP:
		return "8QXP";
	default:
		return "??";
	}
}

const char *get_imx8_rev(u32 rev)
{
	switch (rev) {
	case CHIP_REV_A:
		return "A";
	case CHIP_REV_B:
		return "B";
	default:
		return "?";
	}
}

const char *get_core_name(void)
{
	if (is_cortex_a35())
		return "A35";
	else
		return "?";
}

int print_cpuinfo(void)
{
	struct udevice *dev;
	struct clk cpu_clk;
	int ret;

	ret = uclass_get_device(UCLASS_CPU, 0, &dev);
	if (ret)
		return 0;

	ret = clk_get_by_index(dev, 0, &cpu_clk);
	if (ret) {
		dev_err(dev, "failed to clk\n");
		return 0;
	}

	u32 cpurev;

	cpurev = get_cpu_rev();

	printf("CPU:   Freescale i.MX%s rev%s %s at %ld MHz\n",
	       get_imx8_type((cpurev & 0xFF000) >> 12),
	       get_imx8_rev((cpurev & 0xFFF)),
	       get_core_name(),
	       clk_get_rate(&cpu_clk) / 1000000);

	return 0;
}
#endif

int print_bootinfo(void)
{
	enum boot_device bt_dev = get_boot_device();

	puts("Boot:  ");
	switch (bt_dev) {
	case SD1_BOOT:
		puts("SD0\n");
		break;
	case SD2_BOOT:
		puts("SD1\n");
		break;
	case SD3_BOOT:
		puts("SD2\n");
		break;
	case MMC1_BOOT:
		puts("MMC0\n");
		break;
	case MMC2_BOOT:
		puts("MMC1\n");
		break;
	case MMC3_BOOT:
		puts("MMC2\n");
		break;
	case FLEXSPI_BOOT:
		puts("FLEXSPI\n");
		break;
	case SATA_BOOT:
		puts("SATA\n");
		break;
	case NAND_BOOT:
		puts("NAND\n");
		break;
	case USB_BOOT:
		puts("USB\n");
		break;
	default:
		printf("Unknown device %u\n", bt_dev);
		break;
	}

	return 0;
}

enum boot_device get_boot_device(void)
{
	enum boot_device boot_dev = SD1_BOOT;

	sc_rsrc_t dev_rsrc;

	sc_misc_get_boot_dev(-1, &dev_rsrc);

	switch (dev_rsrc) {
	case SC_R_SDHC_0:
		boot_dev = MMC1_BOOT;
		break;
	case SC_R_SDHC_1:
		boot_dev = SD2_BOOT;
		break;
	case SC_R_SDHC_2:
		boot_dev = SD3_BOOT;
		break;
	case SC_R_NAND:
		boot_dev = NAND_BOOT;
		break;
	case SC_R_FSPI_0:
		boot_dev = FLEXSPI_BOOT;
		break;
	case SC_R_SATA_0:
		boot_dev = SATA_BOOT;
		break;
	case SC_R_USB_0:
	case SC_R_USB_1:
	case SC_R_USB_2:
		boot_dev = USB_BOOT;
		break;
	default:
		break;
	}

	return boot_dev;
}

#ifdef CONFIG_ENV_IS_IN_MMC
__weak int board_mmc_get_env_dev(int devno)
{
	return CONFIG_SYS_MMC_ENV_DEV;
}

int mmc_get_env_dev(void)
{
	sc_rsrc_t dev_rsrc;
	int devno;

	sc_misc_get_boot_dev(-1, &dev_rsrc);

	switch (dev_rsrc) {
	case SC_R_SDHC_0:
		devno = 0;
		break;
	case SC_R_SDHC_1:
		devno = 1;
		break;
	case SC_R_SDHC_2:
		devno = 2;
		break;
	default:
		/* If not boot from sd/mmc, use default value */
		return CONFIG_SYS_MMC_ENV_DEV;
	}

	return board_mmc_get_env_dev(devno);
}
#endif

#define MEMSTART_ALIGNMENT  SZ_2M /* Align the memory start with 2MB */

static int get_owned_memreg(sc_rm_mr_t mr, sc_faddr_t *addr_start,
			    sc_faddr_t *addr_end)
{
	sc_faddr_t start, end;
	int ret;
	bool owned;

	owned = sc_rm_is_memreg_owned(-1, mr);
	if (owned) {
		ret = sc_rm_get_memreg_info(-1, mr, &start, &end);
		if (ret) {
			printf("Memreg get info failed, %d\n", ret);
			return -EINVAL;
		}
		debug("0x%llx -- 0x%llx\n", start, end);
		*addr_start = start;
		*addr_end = end;

		return 0;
	}

	return -EINVAL;
}

phys_size_t get_effective_memsize(void)
{
	sc_rm_mr_t mr;
	sc_faddr_t start, end, end1;
	int err;

	end1 = (sc_faddr_t)PHYS_SDRAM_1 + PHYS_SDRAM_1_SIZE;

	for (mr = 0; mr < 64; mr++) {
		err = get_owned_memreg(mr, &start, &end);
		if (!err) {
			start = roundup(start, MEMSTART_ALIGNMENT);
			/* Too small memory region, not use it */
			if (start > end)
				continue;

			/* Find the memory region runs the u-boot */
			if (start >= PHYS_SDRAM_1 && start <= end1 &&
			    (start <= CONFIG_SYS_TEXT_BASE &&
			    end >= CONFIG_SYS_TEXT_BASE)) {
				if ((end + 1) <= ((sc_faddr_t)PHYS_SDRAM_1 +
				    PHYS_SDRAM_1_SIZE))
					return (end - PHYS_SDRAM_1 + 1);
				else
					return PHYS_SDRAM_1_SIZE;
			}
		}
	}

	return PHYS_SDRAM_1_SIZE;
}

int dram_init(void)
{
	sc_rm_mr_t mr;
	sc_faddr_t start, end, end1, end2;
	int err;

	end1 = (sc_faddr_t)PHYS_SDRAM_1 + PHYS_SDRAM_1_SIZE;
	end2 = (sc_faddr_t)PHYS_SDRAM_2 + PHYS_SDRAM_2_SIZE;
	for (mr = 0; mr < 64; mr++) {
		err = get_owned_memreg(mr, &start, &end);
		if (!err) {
			start = roundup(start, MEMSTART_ALIGNMENT);
			/* Too small memory region, not use it */
			if (start > end)
				continue;

			if (start >= PHYS_SDRAM_1 && start <= end1) {
				if ((end + 1) <= end1)
					gd->ram_size += end - start + 1;
				else
					gd->ram_size += end1 - start;
			} else if (start >= PHYS_SDRAM_2 && start <= end2) {
				if ((end + 1) <= end2)
					gd->ram_size += end - start + 1;
				else
					gd->ram_size += end2 - start;
			}
		}
	}

	/* If error, set to the default value */
	if (!gd->ram_size) {
		gd->ram_size = PHYS_SDRAM_1_SIZE;
		gd->ram_size += PHYS_SDRAM_2_SIZE;
	}
	return 0;
}

static void dram_bank_sort(int current_bank)
{
	phys_addr_t start;
	phys_size_t size;

	while (current_bank > 0) {
		if (gd->bd->bi_dram[current_bank - 1].start >
		    gd->bd->bi_dram[current_bank].start) {
			start = gd->bd->bi_dram[current_bank - 1].start;
			size = gd->bd->bi_dram[current_bank - 1].size;

			gd->bd->bi_dram[current_bank - 1].start =
				gd->bd->bi_dram[current_bank].start;
			gd->bd->bi_dram[current_bank - 1].size =
				gd->bd->bi_dram[current_bank].size;

			gd->bd->bi_dram[current_bank].start = start;
			gd->bd->bi_dram[current_bank].size = size;
		}
		current_bank--;
	}
}

int dram_init_banksize(void)
{
	sc_rm_mr_t mr;
	sc_faddr_t start, end, end1, end2;
	int i = 0;
	int err;

	end1 = (sc_faddr_t)PHYS_SDRAM_1 + PHYS_SDRAM_1_SIZE;
	end2 = (sc_faddr_t)PHYS_SDRAM_2 + PHYS_SDRAM_2_SIZE;

	for (mr = 0; mr < 64 && i < CONFIG_NR_DRAM_BANKS; mr++) {
		err = get_owned_memreg(mr, &start, &end);
		if (!err) {
			start = roundup(start, MEMSTART_ALIGNMENT);
			if (start > end) /* Small memory region, no use it */
				continue;

			if (start >= PHYS_SDRAM_1 && start <= end1) {
				gd->bd->bi_dram[i].start = start;

				if ((end + 1) <= end1)
					gd->bd->bi_dram[i].size =
						end - start + 1;
				else
					gd->bd->bi_dram[i].size = end1 - start;

				dram_bank_sort(i);
				i++;
			} else if (start >= PHYS_SDRAM_2 && start <= end2) {
				gd->bd->bi_dram[i].start = start;

				if ((end + 1) <= end2)
					gd->bd->bi_dram[i].size =
						end - start + 1;
				else
					gd->bd->bi_dram[i].size = end2 - start;

				dram_bank_sort(i);
				i++;
			}
		}
	}

	/* If error, set to the default value */
	if (!i) {
		gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
		gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
		gd->bd->bi_dram[1].start = PHYS_SDRAM_2;
		gd->bd->bi_dram[1].size = PHYS_SDRAM_2_SIZE;
	}

	return 0;
}

static u64 get_block_attrs(sc_faddr_t addr_start)
{
	u64 attr = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) | PTE_BLOCK_NON_SHARE |
		PTE_BLOCK_PXN | PTE_BLOCK_UXN;

	if ((addr_start >= PHYS_SDRAM_1 &&
	     addr_start <= ((sc_faddr_t)PHYS_SDRAM_1 + PHYS_SDRAM_1_SIZE)) ||
	    (addr_start >= PHYS_SDRAM_2 &&
	     addr_start <= ((sc_faddr_t)PHYS_SDRAM_2 + PHYS_SDRAM_2_SIZE)))
		return (PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_OUTER_SHARE);

	return attr;
}

static u64 get_block_size(sc_faddr_t addr_start, sc_faddr_t addr_end)
{
	sc_faddr_t end1, end2;

	end1 = (sc_faddr_t)PHYS_SDRAM_1 + PHYS_SDRAM_1_SIZE;
	end2 = (sc_faddr_t)PHYS_SDRAM_2 + PHYS_SDRAM_2_SIZE;

	if (addr_start >= PHYS_SDRAM_1 && addr_start <= end1) {
		if ((addr_end + 1) > end1)
			return end1 - addr_start;
	} else if (addr_start >= PHYS_SDRAM_2 && addr_start <= end2) {
		if ((addr_end + 1) > end2)
			return end2 - addr_start;
	}

	return (addr_end - addr_start + 1);
}

#define MAX_PTE_ENTRIES 512
#define MAX_MEM_MAP_REGIONS 16

static struct mm_region imx8_mem_map[MAX_MEM_MAP_REGIONS];
struct mm_region *mem_map = imx8_mem_map;

void enable_caches(void)
{
	sc_rm_mr_t mr;
	sc_faddr_t start, end;
	int err, i;

	/* Create map for registers access from 0x1c000000 to 0x80000000*/
	imx8_mem_map[0].virt = 0x1c000000UL;
	imx8_mem_map[0].phys = 0x1c000000UL;
	imx8_mem_map[0].size = 0x64000000UL;
	imx8_mem_map[0].attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
			 PTE_BLOCK_NON_SHARE | PTE_BLOCK_PXN | PTE_BLOCK_UXN;

	i = 1;
	for (mr = 0; mr < 64 && i < MAX_MEM_MAP_REGIONS; mr++) {
		err = get_owned_memreg(mr, &start, &end);
		if (!err) {
			imx8_mem_map[i].virt = start;
			imx8_mem_map[i].phys = start;
			imx8_mem_map[i].size = get_block_size(start, end);
			imx8_mem_map[i].attrs = get_block_attrs(start);
			i++;
		}
	}

	if (i < MAX_MEM_MAP_REGIONS) {
		imx8_mem_map[i].size = 0;
		imx8_mem_map[i].attrs = 0;
	} else {
		puts("Error, need more MEM MAP REGIONS reserved\n");
		icache_enable();
		return;
	}

	for (i = 0; i < MAX_MEM_MAP_REGIONS; i++) {
		debug("[%d] vir = 0x%llx phys = 0x%llx size = 0x%llx attrs = 0x%llx\n",
		      i, imx8_mem_map[i].virt, imx8_mem_map[i].phys,
		      imx8_mem_map[i].size, imx8_mem_map[i].attrs);
	}

	icache_enable();
	dcache_enable();
}

#ifndef CONFIG_SYS_DCACHE_OFF
u64 get_page_table_size(void)
{
	u64 one_pt = MAX_PTE_ENTRIES * sizeof(u64);
	u64 size = 0;

	/*
	 * For each memory region, the max table size:
	 * 2 level 3 tables + 2 level 2 tables + 1 level 1 table
	 */
	size = (2 + 2 + 1) * one_pt * MAX_MEM_MAP_REGIONS + one_pt;

	/*
	 * We need to duplicate our page table once to have an emergency pt to
	 * resort to when splitting page tables later on
	 */
	size *= 2;

	/*
	 * We may need to split page tables later on if dcache settings change,
	 * so reserve up to 4 (random pick) page tables for that.
	 */
	size += one_pt * 4;

	return size;
}
#endif