// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
 * Copyright (C) 2019-2020, STMicroelectronics - All Rights Reserved
 */

#define LOG_CATEGORY LOGC_ARCH

#include <fdtdec.h>
#include <fdt_support.h>
#include <log.h>
#include <tee.h>
#include <mach/stm32.h>
#include <asm/arch/sys_proto.h>
#include <dt-bindings/pinctrl/stm32-pinfunc.h>
#include <linux/io.h>

#define ETZPC_DECPROT(n)	(STM32_ETZPC_BASE + 0x10 + 4 * (n))
#define ETZPC_DECPROT_NB	6

#define DECPROT_MASK		0x03
#define NB_PROT_PER_REG		0x10
#define DECPROT_NB_BITS		2

#define DECPROT_SECURED		0x00
#define DECPROT_WRITE_SECURE	0x01
#define DECPROT_MCU_ISOLATION	0x02
#define DECPROT_NON_SECURED	0x03

#define ETZPC_RESERVED		0xffffffff

#define STM32MP13_FDCAN_BASE	0x4400F000
#define STM32MP13_ADC1_BASE	0x48003000
#define STM32MP13_TSC_BASE	0x5000B000
#define STM32MP13_CRYP_BASE	0x54002000
#define STM32MP13_ETH2_BASE	0x5800E000
#define STM32MP13_DCMIPP_BASE	0x5A000000
#define STM32MP13_LTDC_BASE	0x5A010000

#define STM32MP15_FDCAN_BASE	0x4400e000
#define STM32MP15_CRYP2_BASE	0x4c005000
#define STM32MP15_CRYP1_BASE	0x54001000
#define STM32MP15_GPU_BASE	0x59000000
#define STM32MP15_DSI_BASE	0x5a000000

static const u32 stm32mp13_ip_addr[] = {
	0x50025000,		/* 0 VREFBUF APB3 */
	0x50021000,		/* 1 LPTIM2 APB3 */
	0x50022000,		/* 2 LPTIM3 APB3 */
	STM32MP13_LTDC_BASE,	/* 3 LTDC APB4 */
	STM32MP13_DCMIPP_BASE,	/* 4 DCMIPP APB4 */
	0x5A006000,		/* 5 USBPHYCTRL APB4 */
	0x5A003000,		/* 6 DDRCTRLPHY APB4 */
	ETZPC_RESERVED,		/* 7 Reserved*/
	ETZPC_RESERVED,		/* 8 Reserved*/
	ETZPC_RESERVED,		/* 9 Reserved*/
	0x5C006000,		/* 10 TZC APB5 */
	0x58001000,		/* 11 MCE APB5 */
	0x5C000000,		/* 12 IWDG1 APB5 */
	0x5C008000,		/* 13 STGENC APB5 */
	ETZPC_RESERVED,		/* 14 Reserved*/
	ETZPC_RESERVED,		/* 15 Reserved*/
	0x4C000000,		/* 16 USART1 APB6 */
	0x4C001000,		/* 17 USART2 APB6 */
	0x4C002000,		/* 18 SPI4 APB6 */
	0x4C003000,		/* 19 SPI5 APB6 */
	0x4C004000,		/* 20 I2C3 APB6 */
	0x4C005000,		/* 21 I2C4 APB6 */
	0x4C006000,		/* 22 I2C5 APB6 */
	0x4C007000,		/* 23 TIM12 APB6 */
	0x4C008000,		/* 24 TIM13 APB6 */
	0x4C009000,		/* 25 TIM14 APB6 */
	0x4C00A000,		/* 26 TIM15 APB6 */
	0x4C00B000,		/* 27 TIM16 APB6 */
	0x4C00C000,		/* 28 TIM17 APB6 */
	ETZPC_RESERVED,		/* 29 Reserved*/
	ETZPC_RESERVED,		/* 30 Reserved*/
	ETZPC_RESERVED,		/* 31 Reserved*/
	STM32MP13_ADC1_BASE,	/* 32 ADC1 AHB2 */
	0x48004000,		/* 33 ADC2 AHB2 */
	0x49000000,		/* 34 OTG AHB2 */
	ETZPC_RESERVED,		/* 35 Reserved*/
	ETZPC_RESERVED,		/* 36 Reserved*/
	STM32MP13_TSC_BASE,	/* 37 TSC AHB4 */
	ETZPC_RESERVED,		/* 38 Reserved*/
	ETZPC_RESERVED,		/* 39 Reserved*/
	0x54004000,		/* 40 RNG AHB5 */
	0x54003000,		/* 41 HASH AHB5 */
	STM32MP13_CRYP_BASE,	/* 42 CRYPT AHB5 */
	0x54005000,		/* 43 SAES AHB5 */
	0x54006000,		/* 44 PKA AHB5 */
	0x54000000,		/* 45 BKPSRAM AHB5 */
	ETZPC_RESERVED,		/* 46 Reserved*/
	ETZPC_RESERVED,		/* 47 Reserved*/
	0x5800A000,		/* 48 ETH1 AHB6 */
	STM32MP13_ETH2_BASE,	/* 49 ETH2 AHB6 */
	0x58005000,		/* 50 SDMMC1 AHB6 */
	0x58007000,		/* 51 SDMMC2 AHB6 */
	ETZPC_RESERVED,		/* 52 Reserved*/
	ETZPC_RESERVED,		/* 53 Reserved*/
	0x58002000,		/* 54 FMC AHB6 */
	0x58003000,		/* 55 QSPI AHB6 */
	ETZPC_RESERVED,		/* 56 Reserved*/
	ETZPC_RESERVED,		/* 57 Reserved*/
	ETZPC_RESERVED,		/* 58 Reserved*/
	ETZPC_RESERVED,		/* 59 Reserved*/
	0x30000000,		/* 60 SRAM1 MLAHB */
	0x30004000,		/* 61 SRAM2 MLAHB */
	0x30006000,		/* 62 SRAM3 MLAHB */
	ETZPC_RESERVED,		/* 63 Reserved*/
	ETZPC_RESERVED,		/* 64 Reserved*/
	ETZPC_RESERVED,		/* 65 Reserved*/
	ETZPC_RESERVED,		/* 66 Reserved*/
	ETZPC_RESERVED,		/* 67 Reserved*/
	ETZPC_RESERVED,		/* 68 Reserved*/
	ETZPC_RESERVED,		/* 69 Reserved*/
	ETZPC_RESERVED,		/* 70 Reserved*/
	ETZPC_RESERVED,		/* 71 Reserved*/
	ETZPC_RESERVED,		/* 72 Reserved*/
	ETZPC_RESERVED,		/* 73 Reserved*/
	ETZPC_RESERVED,		/* 74 Reserved*/
	ETZPC_RESERVED,		/* 75 Reserved*/
	ETZPC_RESERVED,		/* 76 Reserved*/
	ETZPC_RESERVED,		/* 77 Reserved*/
	ETZPC_RESERVED,		/* 78 Reserved*/
	ETZPC_RESERVED,		/* 79 Reserved*/
	ETZPC_RESERVED,		/* 80 Reserved*/
	ETZPC_RESERVED,		/* 81 Reserved*/
	ETZPC_RESERVED,		/* 82 Reserved*/
	ETZPC_RESERVED,		/* 83 Reserved*/
	ETZPC_RESERVED,		/* 84 Reserved*/
	ETZPC_RESERVED,		/* 85 Reserved*/
	ETZPC_RESERVED,		/* 86 Reserved*/
	ETZPC_RESERVED,		/* 87 Reserved*/
	ETZPC_RESERVED,		/* 88 Reserved*/
	ETZPC_RESERVED,		/* 89 Reserved*/
	ETZPC_RESERVED,		/* 90 Reserved*/
	ETZPC_RESERVED,		/* 91 Reserved*/
	ETZPC_RESERVED,		/* 92 Reserved*/
	ETZPC_RESERVED,		/* 93 Reserved*/
	ETZPC_RESERVED,		/* 94 Reserved*/
	ETZPC_RESERVED,		/* 95 Reserved*/
};

static const u32 stm32mp15_ip_addr[] = {
	0x5c008000,	/* 00 stgenc */
	0x54000000,	/* 01 bkpsram */
	0x5c003000,	/* 02 iwdg1 */
	0x5c000000,	/* 03 usart1 */
	0x5c001000,	/* 04 spi6 */
	0x5c002000,	/* 05 i2c4 */
	ETZPC_RESERVED,	/* 06 reserved */
	0x54003000,	/* 07 rng1 */
	0x54002000,	/* 08 hash1 */
	STM32MP15_CRYP1_BASE,	/* 09 cryp1 */
	0x5a003000,	/* 0A ddrctrl */
	0x5a004000,	/* 0B ddrphyc */
	0x5c009000,	/* 0C i2c6 */
	ETZPC_RESERVED,	/* 0D reserved */
	ETZPC_RESERVED,	/* 0E reserved */
	ETZPC_RESERVED,	/* 0F reserved */
	0x40000000,	/* 10 tim2 */
	0x40001000,	/* 11 tim3 */
	0x40002000,	/* 12 tim4 */
	0x40003000,	/* 13 tim5 */
	0x40004000,	/* 14 tim6 */
	0x40005000,	/* 15 tim7 */
	0x40006000,	/* 16 tim12 */
	0x40007000,	/* 17 tim13 */
	0x40008000,	/* 18 tim14 */
	0x40009000,	/* 19 lptim1 */
	0x4000a000,	/* 1A wwdg1 */
	0x4000b000,	/* 1B spi2 */
	0x4000c000,	/* 1C spi3 */
	0x4000d000,	/* 1D spdifrx */
	0x4000e000,	/* 1E usart2 */
	0x4000f000,	/* 1F usart3 */
	0x40010000,	/* 20 uart4 */
	0x40011000,	/* 21 uart5 */
	0x40012000,	/* 22 i2c1 */
	0x40013000,	/* 23 i2c2 */
	0x40014000,	/* 24 i2c3 */
	0x40015000,	/* 25 i2c5 */
	0x40016000,	/* 26 cec */
	0x40017000,	/* 27 dac */
	0x40018000,	/* 28 uart7 */
	0x40019000,	/* 29 uart8 */
	ETZPC_RESERVED,	/* 2A reserved */
	ETZPC_RESERVED,	/* 2B reserved */
	0x4001c000,	/* 2C mdios */
	ETZPC_RESERVED,	/* 2D reserved */
	ETZPC_RESERVED,	/* 2E reserved */
	ETZPC_RESERVED,	/* 2F reserved */
	0x44000000,	/* 30 tim1 */
	0x44001000,	/* 31 tim8 */
	ETZPC_RESERVED,	/* 32 reserved */
	0x44003000,	/* 33 usart6 */
	0x44004000,	/* 34 spi1 */
	0x44005000,	/* 35 spi4 */
	0x44006000,	/* 36 tim15 */
	0x44007000,	/* 37 tim16 */
	0x44008000,	/* 38 tim17 */
	0x44009000,	/* 39 spi5 */
	0x4400a000,	/* 3A sai1 */
	0x4400b000,	/* 3B sai2 */
	0x4400c000,	/* 3C sai3 */
	0x4400d000,	/* 3D dfsdm */
	STM32MP15_FDCAN_BASE,	/* 3E tt_fdcan */
	ETZPC_RESERVED,	/* 3F reserved */
	0x50021000,	/* 40 lptim2 */
	0x50022000,	/* 41 lptim3 */
	0x50023000,	/* 42 lptim4 */
	0x50024000,	/* 43 lptim5 */
	0x50027000,	/* 44 sai4 */
	0x50025000,	/* 45 vrefbuf */
	0x4c006000,	/* 46 dcmi */
	0x4c004000,	/* 47 crc2 */
	0x48003000,	/* 48 adc */
	0x4c002000,	/* 49 hash2 */
	0x4c003000,	/* 4A rng2 */
	STM32MP15_CRYP2_BASE,	/* 4B cryp2 */
	ETZPC_RESERVED,	/* 4C reserved */
	ETZPC_RESERVED,	/* 4D reserved */
	ETZPC_RESERVED,	/* 4E reserved */
	ETZPC_RESERVED,	/* 4F reserved */
	ETZPC_RESERVED,	/* 50 sram1 */
	ETZPC_RESERVED,	/* 51 sram2 */
	ETZPC_RESERVED,	/* 52 sram3 */
	ETZPC_RESERVED,	/* 53 sram4 */
	ETZPC_RESERVED,	/* 54 retram */
	0x49000000,	/* 55 otg */
	0x48004000,	/* 56 sdmmc3 */
	0x48005000,	/* 57 dlybsd3 */
	0x48000000,	/* 58 dma1 */
	0x48001000,	/* 59 dma2 */
	0x48002000,	/* 5A dmamux */
	0x58002000,	/* 5B fmc */
	0x58003000,	/* 5C qspi */
	0x58004000,	/* 5D dlybq */
	0x5800a000,	/* 5E eth */
	ETZPC_RESERVED,	/* 5F reserved */
};

/* fdt helper */
static bool fdt_disable_subnode_by_address(void *fdt, int offset, u32 addr)
{
	int node;
	fdt_addr_t regs;

	for (node = fdt_first_subnode(fdt, offset);
	     node >= 0;
	     node = fdt_next_subnode(fdt, node)) {
		regs = fdtdec_get_addr(fdt, node, "reg");
		if (addr == regs) {
			if (fdtdec_get_is_enabled(fdt, node)) {
				fdt_status_disabled(fdt, node);

				return true;
			}
			return false;
		}
	}

	return false;
}

static int stm32_fdt_fixup_etzpc(void *fdt, int soc_node)
{
	const u32 *array;
	int array_size, i;
	int offset, shift;
	u32 addr, status, decprot[ETZPC_DECPROT_NB];

	if (IS_ENABLED(CONFIG_STM32MP13X)) {
		array = stm32mp13_ip_addr;
		array_size = ARRAY_SIZE(stm32mp13_ip_addr);
	}

	if (IS_ENABLED(CONFIG_STM32MP15X)) {
		array = stm32mp15_ip_addr;
		array_size = ARRAY_SIZE(stm32mp15_ip_addr);
	}

	for (i = 0; i < ETZPC_DECPROT_NB; i++)
		decprot[i] = readl(ETZPC_DECPROT(i));

	for (i = 0; i < array_size; i++) {
		offset = i / NB_PROT_PER_REG;
		shift = (i % NB_PROT_PER_REG) * DECPROT_NB_BITS;
		status = (decprot[offset] >> shift) & DECPROT_MASK;
		addr = array[i];

		log_debug("ETZPC: 0x%08x decprot %d=%d\n", addr, i, status);

		if (addr == ETZPC_RESERVED ||
		    status == DECPROT_NON_SECURED)
			continue;

		if (fdt_disable_subnode_by_address(fdt, soc_node, addr))
			log_notice("ETZPC: 0x%08x node disabled, decprot %d=%d\n",
				   addr, i, status);
	}

	return 0;
}

/* deactivate all the cpu except core 0 */
static void stm32_fdt_fixup_cpu(void *blob, char *name)
{
	int off;
	u32 reg;

	off = fdt_path_offset(blob, "/cpus");
	if (off < 0) {
		log_warning("%s: couldn't find /cpus node\n", __func__);
		return;
	}

	off = fdt_node_offset_by_prop_value(blob, -1, "device_type", "cpu", 4);
	while (off != -FDT_ERR_NOTFOUND) {
		reg = fdtdec_get_addr(blob, off, "reg");
		if (reg != 0) {
			fdt_del_node(blob, off);
			log_notice("FDT: cpu %d node remove for %s\n",
				   reg, name);
			/* after delete we can't trust the offsets anymore */
			off = -1;
		}
		off = fdt_node_offset_by_prop_value(blob, off,
						    "device_type", "cpu", 4);
	}
}

static void stm32_fdt_disable(void *fdt, int offset, u32 addr,
			      const char *string, const char *name)
{
	if (fdt_disable_subnode_by_address(fdt, offset, addr))
		log_notice("FDT: %s@%08x node disabled for %s\n",
			   string, addr, name);
}

static void stm32_fdt_disable_optee(void *blob)
{
	int off, node;

	/* Delete "optee" firmware node */
	off = fdt_node_offset_by_compatible(blob, -1, "linaro,optee-tz");
	if (off >= 0 && fdtdec_get_is_enabled(blob, off))
		fdt_del_node(blob, off);

	/* Delete "optee@..." reserved-memory node */
	off = fdt_path_offset(blob, "/reserved-memory/");
	if (off < 0)
		return;
	for (node = fdt_first_subnode(blob, off);
	     node >= 0;
	     node = fdt_next_subnode(blob, node)) {
		if (strncmp(fdt_get_name(blob, node, NULL), "optee@", 6))
			continue;

		if (fdt_del_node(blob, node))
			printf("Failed to remove optee reserved-memory node\n");
	}
}

static void stm32mp13_fdt_fixup(void *blob, int soc, u32 cpu, char *name)
{
	switch (cpu) {
	case CPU_STM32MP131Fxx:
	case CPU_STM32MP131Dxx:
	case CPU_STM32MP131Cxx:
	case CPU_STM32MP131Axx:
		stm32_fdt_disable(blob, soc, STM32MP13_FDCAN_BASE, "can", name);
		stm32_fdt_disable(blob, soc, STM32MP13_ADC1_BASE, "adc", name);
		fallthrough;
	case CPU_STM32MP133Fxx:
	case CPU_STM32MP133Dxx:
	case CPU_STM32MP133Cxx:
	case CPU_STM32MP133Axx:
		stm32_fdt_disable(blob, soc, STM32MP13_LTDC_BASE, "ltdc", name);
		stm32_fdt_disable(blob, soc, STM32MP13_DCMIPP_BASE, "dcmipp",
				  name);
		stm32_fdt_disable(blob, soc, STM32MP13_TSC_BASE, "tsc", name);
		break;
	default:
		break;
	}

	switch (cpu) {
	case CPU_STM32MP135Dxx:
	case CPU_STM32MP135Axx:
	case CPU_STM32MP133Dxx:
	case CPU_STM32MP133Axx:
	case CPU_STM32MP131Dxx:
	case CPU_STM32MP131Axx:
		stm32_fdt_disable(blob, soc, STM32MP13_CRYP_BASE, "cryp", name);
		break;
	default:
		break;
	}
}

static void stm32mp15_fdt_fixup(void *blob, int soc, u32 cpu, char *name)
{
	u32 pkg;

	switch (cpu) {
	case CPU_STM32MP151Fxx:
	case CPU_STM32MP151Dxx:
	case CPU_STM32MP151Cxx:
	case CPU_STM32MP151Axx:
		stm32_fdt_fixup_cpu(blob, name);
		/* after cpu delete we can't trust the soc offsets anymore */
		soc = fdt_path_offset(blob, "/soc");
		stm32_fdt_disable(blob, soc, STM32MP15_FDCAN_BASE, "can", name);
		fallthrough;
	case CPU_STM32MP153Fxx:
	case CPU_STM32MP153Dxx:
	case CPU_STM32MP153Cxx:
	case CPU_STM32MP153Axx:
		stm32_fdt_disable(blob, soc, STM32MP15_GPU_BASE, "gpu", name);
		stm32_fdt_disable(blob, soc, STM32MP15_DSI_BASE, "dsi", name);
		break;
	default:
		break;
	}
	switch (cpu) {
	case CPU_STM32MP157Dxx:
	case CPU_STM32MP157Axx:
	case CPU_STM32MP153Dxx:
	case CPU_STM32MP153Axx:
	case CPU_STM32MP151Dxx:
	case CPU_STM32MP151Axx:
		stm32_fdt_disable(blob, soc, STM32MP15_CRYP1_BASE, "cryp",
				  name);
		stm32_fdt_disable(blob, soc, STM32MP15_CRYP2_BASE, "cryp",
				  name);
		break;
	default:
		break;
	}
	switch (get_cpu_package()) {
	case STM32MP15_PKG_AA_LBGA448:
		pkg = STM32MP_PKG_AA;
		break;
	case STM32MP15_PKG_AB_LBGA354:
		pkg = STM32MP_PKG_AB;
		break;
	case STM32MP15_PKG_AC_TFBGA361:
		pkg = STM32MP_PKG_AC;
		break;
	case STM32MP15_PKG_AD_TFBGA257:
		pkg = STM32MP_PKG_AD;
		break;
	default:
		pkg = 0;
		break;
	}
	if (pkg) {
		do_fixup_by_compat_u32(blob, "st,stm32mp157-pinctrl",
				       "st,package", pkg, false);
		do_fixup_by_compat_u32(blob, "st,stm32mp157-z-pinctrl",
				       "st,package", pkg, false);
	}
}

/*
 * This function is called right before the kernel is booted. "blob" is the
 * device tree that will be passed to the kernel.
 */
int ft_system_setup(void *blob, struct bd_info *bd)
{
	int ret = 0;
	int soc;
	u32 cpu;
	char name[SOC_NAME_SIZE];

	soc = fdt_path_offset(blob, "/soc");
	/* when absent, nothing to do */
	if (soc == -FDT_ERR_NOTFOUND)
		return 0;
	if (soc < 0)
		return soc;

	if (CONFIG_IS_ENABLED(STM32_ETZPC)) {
		ret = stm32_fdt_fixup_etzpc(blob, soc);
		if (ret)
			return ret;
	}

	/* MPUs Part Numbers and name*/
	cpu = get_cpu_type();
	get_soc_name(name);

	if (IS_ENABLED(CONFIG_STM32MP13X))
		stm32mp13_fdt_fixup(blob, soc, cpu, name);

	if (IS_ENABLED(CONFIG_STM32MP15X)) {
		stm32mp15_fdt_fixup(blob, soc, cpu, name);

		/*
		 * TEMP: remove OP-TEE nodes in kernel device tree
		 *       copied from U-Boot device tree by optee_copy_fdt_nodes
		 *       when OP-TEE is not detected (probe failed)
		 * these OP-TEE nodes are present in <board>-u-boot.dtsi
		 * under CONFIG_STM32MP15x_STM32IMAGE only for compatibility
		 * when FIP is not used by TF-A
		 */
		if (IS_ENABLED(CONFIG_STM32MP15X_STM32IMAGE) &&
		    !tee_find_device(NULL, NULL, NULL, NULL))
			stm32_fdt_disable_optee(blob);
	}

	return ret;
}