arch/arm/mach-imx/imx8m/soc.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2017 NXP
 *
 * Peng Fan <peng.fan@nxp.com>
 */

#include <common.h>
#include <asm/arch/imx-regs.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/sys_proto.h>
#include <asm/mach-imx/hab.h>
#include <asm/mach-imx/boot_mode.h>
#include <asm/mach-imx/syscounter.h>
#include <asm/armv8/mmu.h>
#include <errno.h>
#include <fdt_support.h>
#include <fsl_wdog.h>
#include <imx_sip.h>

DECLARE_GLOBAL_DATA_PTR;

#if defined(CONFIG_SECURE_BOOT)
struct imx_sec_config_fuse_t const imx_sec_config_fuse = {
	.bank = 1,
	.word = 3,
};
#endif

int timer_init(void)
{
#ifdef CONFIG_SPL_BUILD
	struct sctr_regs *sctr = (struct sctr_regs *)SYSCNT_CTRL_BASE_ADDR;
	unsigned long freq = readl(&sctr->cntfid0);

	/* Update with accurate clock frequency */
	asm volatile("msr cntfrq_el0, %0" : : "r" (freq) : "memory");

	clrsetbits_le32(&sctr->cntcr, SC_CNTCR_FREQ0 | SC_CNTCR_FREQ1,
			SC_CNTCR_FREQ0 | SC_CNTCR_ENABLE | SC_CNTCR_HDBG);
#endif

	gd->arch.tbl = 0;
	gd->arch.tbu = 0;

	return 0;
}

void enable_tzc380(void)
{
	struct iomuxc_gpr_base_regs *gpr =
		(struct iomuxc_gpr_base_regs *)IOMUXC_GPR_BASE_ADDR;

	/* Enable TZASC and lock setting */
	setbits_le32(&gpr->gpr[10], GPR_TZASC_EN);
	setbits_le32(&gpr->gpr[10], GPR_TZASC_EN_LOCK);
	if (IS_ENABLED(CONFIG_IMX8MM))
		setbits_le32(&gpr->gpr[10], BIT(1));
	/*
	 * set Region 0 attribute to allow secure and non-secure
	 * read/write permission. Found some masters like usb dwc3
	 * controllers can't work with secure memory.
	 */
	writel(0xf0000000, TZASC_BASE_ADDR + 0x108);
}

void set_wdog_reset(struct wdog_regs *wdog)
{
	/*
	 * Output WDOG_B signal to reset external pmic or POR_B decided by
	 * the board design. Without external reset, the peripherals/DDR/
	 * PMIC are not reset, that may cause system working abnormal.
	 * WDZST bit is write-once only bit. Align this bit in kernel,
	 * otherwise kernel code will have no chance to set this bit.
	 */
	setbits_le16(&wdog->wcr, WDOG_WDT_MASK | WDOG_WDZST_MASK);
}

static struct mm_region imx8m_mem_map[] = {
	{
		/* ROM */
		.virt = 0x0UL,
		.phys = 0x0UL,
		.size = 0x100000UL,
		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
			 PTE_BLOCK_OUTER_SHARE
	}, {
		/* CAAM */
		.virt = 0x100000UL,
		.phys = 0x100000UL,
		.size = 0x8000UL,
		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
			 PTE_BLOCK_NON_SHARE |
			 PTE_BLOCK_PXN | PTE_BLOCK_UXN
	}, {
		/* TCM */
		.virt = 0x7C0000UL,
		.phys = 0x7C0000UL,
		.size = 0x80000UL,
		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
			 PTE_BLOCK_NON_SHARE |
			 PTE_BLOCK_PXN | PTE_BLOCK_UXN
	}, {
		/* OCRAM */
		.virt = 0x900000UL,
		.phys = 0x900000UL,
		.size = 0x200000UL,
		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
			 PTE_BLOCK_OUTER_SHARE
	}, {
		/* AIPS */
		.virt = 0xB00000UL,
		.phys = 0xB00000UL,
		.size = 0x3f500000UL,
		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
			 PTE_BLOCK_NON_SHARE |
			 PTE_BLOCK_PXN | PTE_BLOCK_UXN
	}, {
		/* DRAM1 */
		.virt = 0x40000000UL,
		.phys = 0x40000000UL,
		.size = PHYS_SDRAM_SIZE,
		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
			 PTE_BLOCK_OUTER_SHARE
#ifdef PHYS_SDRAM_2_SIZE
	}, {
		/* DRAM2 */
		.virt = 0x100000000UL,
		.phys = 0x100000000UL,
		.size = PHYS_SDRAM_2_SIZE,
		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
			 PTE_BLOCK_OUTER_SHARE
#endif
	}, {
		/* List terminator */
		0,
	}
};

struct mm_region *mem_map = imx8m_mem_map;

void enable_caches(void)
{
	/*
	 * If OPTEE runs, remove OPTEE memory from MMU table to
	 * avoid speculative prefetch. OPTEE runs at the top of
	 * the first memory bank
	 */
	if (rom_pointer[1])
		imx8m_mem_map[5].size -= rom_pointer[1];

	icache_enable();
	dcache_enable();
}

static u32 get_cpu_variant_type(u32 type)
{
	struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
	struct fuse_bank *bank = &ocotp->bank[1];
	struct fuse_bank1_regs *fuse =
		(struct fuse_bank1_regs *)bank->fuse_regs;

	u32 value = readl(&fuse->tester4);

	if (type == MXC_CPU_IMX8MM) {
		switch (value & 0x3) {
		case 2:
			if (value & 0x1c0000)
				return MXC_CPU_IMX8MMDL;
			else
				return MXC_CPU_IMX8MMD;
		case 3:
			if (value & 0x1c0000)
				return MXC_CPU_IMX8MMSL;
			else
				return MXC_CPU_IMX8MMS;
		default:
			if (value & 0x1c0000)
				return MXC_CPU_IMX8MML;
			break;
		}
	}

	return type;
}

u32 get_cpu_rev(void)
{
	struct anamix_pll *ana_pll = (struct anamix_pll *)ANATOP_BASE_ADDR;
	u32 reg = readl(&ana_pll->digprog);
	u32 type = (reg >> 16) & 0xff;
	u32 major_low = (reg >> 8) & 0xff;
	u32 rom_version;

	reg &= 0xff;

	/* i.MX8MM */
	if (major_low == 0x41) {
		type = get_cpu_variant_type(MXC_CPU_IMX8MM);
	} else {
		if (reg == CHIP_REV_1_0) {
			/*
			 * For B0 chip, the DIGPROG is not updated, still TO1.0.
			 * we have to check ROM version further
			 */
			rom_version = readl((void __iomem *)ROM_VERSION_A0);
			if (rom_version != CHIP_REV_1_0) {
				rom_version = readl((void __iomem *)ROM_VERSION_B0);
				if (rom_version >= CHIP_REV_2_0)
					reg = CHIP_REV_2_0;
			}
		}
	}

	return (type << 12) | reg;
}

static void imx_set_wdog_powerdown(bool enable)
{
	struct wdog_regs *wdog1 = (struct wdog_regs *)WDOG1_BASE_ADDR;
	struct wdog_regs *wdog2 = (struct wdog_regs *)WDOG2_BASE_ADDR;
	struct wdog_regs *wdog3 = (struct wdog_regs *)WDOG3_BASE_ADDR;

	/* Write to the PDE (Power Down Enable) bit */
	writew(enable, &wdog1->wmcr);
	writew(enable, &wdog2->wmcr);
	writew(enable, &wdog3->wmcr);
}

int arch_cpu_init(void)
{
	struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
	/*
	 * Init timer at very early state, because sscg pll setting
	 * will use it
	 */
	timer_init();

	if (IS_ENABLED(CONFIG_SPL_BUILD)) {
		clock_init();
		imx_set_wdog_powerdown(false);
	}

	if (is_imx8mq()) {
		clock_enable(CCGR_OCOTP, 1);
		if (readl(&ocotp->ctrl) & 0x200)
			writel(0x200, &ocotp->ctrl_clr);
	}

	return 0;
}

bool is_usb_boot(void)
{
	return get_boot_device() == USB_BOOT;
}

#ifdef CONFIG_OF_SYSTEM_SETUP
int ft_system_setup(void *blob, bd_t *bd)
{
	int i = 0;
	int rc;
	int nodeoff;

	/* Disable the CPU idle for A0 chip since the HW does not support it */
	if (is_soc_rev(CHIP_REV_1_0)) {
		static const char * const nodes_path[] = {
			"/cpus/cpu@0",
			"/cpus/cpu@1",
			"/cpus/cpu@2",
			"/cpus/cpu@3",
		};

		for (i = 0; i < ARRAY_SIZE(nodes_path); i++) {
			nodeoff = fdt_path_offset(blob, nodes_path[i]);
			if (nodeoff < 0)
				continue; /* Not found, skip it */

			printf("Found %s node\n", nodes_path[i]);

			rc = fdt_delprop(blob, nodeoff, "cpu-idle-states");
			if (rc) {
				printf("Unable to update property %s:%s, err=%s\n",
				       nodes_path[i], "status", fdt_strerror(rc));
				return rc;
			}

			printf("Remove %s:%s\n", nodes_path[i],
			       "cpu-idle-states");
		}
	}

	return 0;
}
#endif

void reset_cpu(ulong addr)
{
	struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;

	/* Clear WDA to trigger WDOG_B immediately */
	writew((WCR_WDE | WCR_SRS), &wdog->wcr);

	while (1) {
		/*
		 * spin for .5 seconds before reset
		 */
	}
}