imx: mx8m: add soc related settings and files

Add SoC level initialization code
 - arch_cpu_init
 - mmu table
 - detect cpu revision
 - reset cpu and wdog settings
 - timer init
 - wdog settings
 - lowlevel init to save/restore registers
 - a few dummy header file to avoid build failure
 - ft_system_setup

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>

arch/arm/include/asm/arch-mx8m/crm_regs.h

@@ -0,0 +1,10 @@
+/*
+ * Copyright 2017 NXP
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _ASM_ARCH_MX8M_CRM_REGS_H
+#define _ASM_ARCH_MX8M_CRM_REGS_H
+/* Dummy header, some imx-common code needs this file */
+#endif

arch/arm/include/asm/arch-mx8m/gpio.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright 2017 NXP
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __ASM_ARCH_MX8M_GPIO_H
+#define __ASM_ARCH_MX8M_GPIO_H
+
+#include <asm/mach-imx/gpio.h>
+
+#endif

arch/arm/include/asm/arch-mx8m/sys_proto.h

@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2017 NXP
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __ARCH_MX8M_SYS_PROTO_H
+#define __ARCH_MX8M_SYS_PROTO_H
+
+#include <asm/mach-imx/sys_proto.h>
+
+void set_wdog_reset(struct wdog_regs *wdog);
+void enable_tzc380(void);
+void restore_boot_params(void);
+extern unsigned long rom_pointer[];
+enum boot_device get_boot_device(void);
+bool is_usb_boot(void);
+#endif

arch/arm/mach-imx/Makefile

@@ -132,4 +132,4 @@ obj-$(CONFIG_MX5) += mx5/
 obj-$(CONFIG_MX6) += mx6/
 obj-$(CONFIG_MX7) += mx7/
 obj-$(CONFIG_ARCH_MX7ULP) += mx7ulp/
-
+obj-$(CONFIG_MX8M) += mx8m/

arch/arm/mach-imx/mx8m/Makefile

@@ -4,4 +4,5 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y += clock.o clock_slice.o
+obj-y += lowlevel_init.o
+obj-y += clock.o clock_slice.o soc.o

arch/arm/mach-imx/mx8m/lowlevel_init.S

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2017 NXP
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+
+.align 8
+.global rom_pointer
+rom_pointer:
+	.space 256
+
+/*
+ * Routine: save_boot_params (called after reset from start.S)
+ */
+
+.global save_boot_params
+save_boot_params:
+	/* The firmware provided ATAG/FDT address can be found in r2/x0 */
+	adr	x0, rom_pointer
+	stp	x1, x2, [x0], #16
+	stp	x3, x4, [x0], #16
+	stp	x5, x6, [x0], #16
+	stp	x7, x8, [x0], #16
+	stp	x9, x10, [x0], #16
+	stp	x11, x12, [x0], #16
+	stp	x13, x14, [x0], #16
+	stp	x15, x16, [x0], #16
+	stp	x17, x18, [x0], #16
+	stp	x19, x20, [x0], #16
+	stp	x21, x22, [x0], #16
+	stp	x23, x24, [x0], #16
+	stp	x25, x26, [x0], #16
+	stp	x27, x28, [x0], #16
+	stp	x29, x30, [x0], #16
+	mov	x30, sp
+	str	x30, [x0], #8
+
+	/* Returns */
+	b	save_boot_params_ret
+
+.global restore_boot_params
+restore_boot_params:
+	adr	x0, rom_pointer
+	ldp	x1, x2, [x0], #16
+	ldp	x3, x4, [x0], #16
+	ldp	x5, x6, [x0], #16
+	ldp	x7, x8, [x0], #16
+	ldp	x9, x10, [x0], #16
+	ldp	x11, x12, [x0], #16
+	ldp	x13, x14, [x0], #16
+	ldp	x15, x16, [x0], #16
+	ldp	x17, x18, [x0], #16
+	ldp	x19, x20, [x0], #16
+	ldp	x21, x22, [x0], #16
+	ldp	x23, x24, [x0], #16
+	ldp	x25, x26, [x0], #16
+	ldp	x27, x28, [x0], #16
+	ldp	x29, x30, [x0], #16
+	ldr	x0, [x0]
+	mov	sp, x0
+	ret

arch/arm/mach-imx/mx8m/soc.c

@@ -0,0 +1,227 @@
+/*
+ * Copyright 2017 NXP
+ *
+ * Peng Fan <peng.fan@nxp.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#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);
+}
+
+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
+	}, {
+		/* 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 = 0xC0000000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
+			 PTE_BLOCK_OUTER_SHARE
+	}, {
+		/* DRAM2 */
+		.virt = 0x100000000UL,
+		.phys = 0x100000000UL,
+		.size = 0x040000000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
+			 PTE_BLOCK_OUTER_SHARE
+	}, {
+		/* List terminator */
+		0,
+	}
+};
+
+struct mm_region *mem_map = imx8m_mem_map;
+
+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 rom_version;
+
+	reg &= 0xff;
+
+	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)
+{
+	/*
+	 * 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);
+	}
+
+	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
+		 */
+	}
+}