// SPDX-License-Identifier: GPL-2.0+
/*
 * K3: System Firmware Loader
 *
 * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
 *	Andreas Dannenberg <dannenberg@ti.com>
 */

#include <common.h>
#include <dm.h>
#include <image.h>
#include <log.h>
#include <spl.h>
#include <malloc.h>
#include <remoteproc.h>
#include <asm/cache.h>
#include <asm/global_data.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include <g_dnl.h>
#include <usb.h>
#include <dfu.h>
#include <dm/uclass-internal.h>
#include <spi_flash.h>

#include <asm/io.h>
#include <asm/arch/sys_proto.h>
#include "common.h"

DECLARE_GLOBAL_DATA_PTR;

/* Name of the FIT image nodes for SYSFW and its config data */
#define SYSFW_FIRMWARE			"sysfw.bin"
#define SYSFW_CFG_BOARD			"board-cfg.bin"
#define SYSFW_CFG_PM			"pm-cfg.bin"
#define SYSFW_CFG_RM			"rm-cfg.bin"
#define SYSFW_CFG_SEC			"sec-cfg.bin"

/*
 * It is assumed that remoteproc device 0 is the corresponding
 * system-controller that runs SYSFW. Make sure DT reflects the same.
 */
#define K3_SYSTEM_CONTROLLER_RPROC_ID	0

#define COMMON_HEADER_ADDRESS		0x41cffb00
#define BOARDCFG_ADDRESS		0x41c80000

#define COMP_TYPE_SBL_DATA		0x11
#define DESC_TYPE_BOARDCFG_PM_INDEX	0x2
#define DESC_TYPE_BOARDCFG_RM_INDEX	0x3

#define BOARD_CONFIG_RM_DESC_TYPE	0x000c
#define BOARD_CONFIG_PM_DESC_TYPE	0x000e

struct extboot_comp {
	u32 comp_type;
	u32 boot_core;
	u32 comp_opts;
	u64 dest_addr;
	u32 comp_size;
};

struct extboot_header {
	u8 magic[8];
	u32 num_comps;
	struct extboot_comp comps[5];
	u32 reserved;
};

struct bcfg_desc {
	u16 type;
	u16 offset;
	u16 size;
	u8 devgrp;
	u8 reserved;
} __packed;

struct bcfg_header {
	u8 num_elems;
	u8 sw_rev;
	struct bcfg_desc descs[4];
	u16 reserved;
} __packed;

static bool sysfw_loaded;
static void *sysfw_load_address;

/*
 * Populate SPL hook to override the default load address used by the SPL
 * loader function with a custom address for SYSFW loading.
 */
struct image_header *spl_get_load_buffer(ssize_t offset, size_t size)
{
	if (sysfw_loaded)
		return (struct image_header *)(CONFIG_SYS_TEXT_BASE + offset);
	else if (sysfw_load_address)
		return sysfw_load_address;
	else
		panic("SYSFW load address not defined!");
}

/*
 * Populate SPL hook to skip the default SPL loader FIT post-processing steps
 * during SYSFW loading and return to the calling function so we can perform
 * our own custom processing.
 */
bool spl_load_simple_fit_skip_processing(void)
{
	return !sysfw_loaded;
}

static int fit_get_data_by_name(const void *fit, int images, const char *name,
				const void **addr, size_t *size)
{
	int node_offset;

	node_offset = fdt_subnode_offset(fit, images, name);
	if (node_offset < 0)
		return -ENOENT;

	return fit_image_get_data(fit, node_offset, addr, size);
}

static void k3_start_system_controller(int rproc_id, bool rproc_loaded,
				       ulong addr, ulong size)
{
	int ret;

	ret = rproc_dev_init(rproc_id);
	if (ret)
		panic("rproc failed to be initialized (%d)\n", ret);

	if (!rproc_loaded) {
		ret = rproc_load(rproc_id, addr, size);
		if (ret)
			panic("Firmware failed to start on rproc (%d)\n", ret);
	}

	ret = rproc_start(0);
	if (ret)
		panic("Firmware init failed on rproc (%d)\n", ret);
}

static void k3_sysfw_load_using_fit(void *fit)
{
	int images;
	const void *sysfw_addr;
	size_t sysfw_size;
	int ret;

	/* Find the node holding the images information */
	images = fdt_path_offset(fit, FIT_IMAGES_PATH);
	if (images < 0)
		panic("Cannot find /images node (%d)\n", images);

	/* Extract System Firmware (SYSFW) image from FIT */
	ret = fit_get_data_by_name(fit, images, SYSFW_FIRMWARE,
				   &sysfw_addr, &sysfw_size);
	if (ret < 0)
		panic("Error accessing %s node in FIT (%d)\n", SYSFW_FIRMWARE,
		      ret);

	/* Start up system controller firmware */
	k3_start_system_controller(K3_SYSTEM_CONTROLLER_RPROC_ID, false,
				   (ulong)sysfw_addr, (ulong)sysfw_size);
}

static void k3_sysfw_configure_using_fit(void *fit,
					 struct ti_sci_handle *ti_sci)
{
	struct ti_sci_board_ops *board_ops = &ti_sci->ops.board_ops;
	int images;
	const void *cfg_fragment_addr;
	size_t cfg_fragment_size;
	int ret;
	u8 *buf;
	struct extboot_header *common_header;
	struct bcfg_header *bcfg_header;
	struct extboot_comp *comp;
	struct bcfg_desc *desc;
	u32 addr;
	bool copy_bcfg = false;

	/* Find the node holding the images information */
	images = fdt_path_offset(fit, FIT_IMAGES_PATH);
	if (images < 0)
		panic("Cannot find /images node (%d)\n", images);

	/* Extract board configuration from FIT */
	ret = fit_get_data_by_name(fit, images, SYSFW_CFG_BOARD,
				   &cfg_fragment_addr, &cfg_fragment_size);
	if (ret < 0)
		panic("Error accessing %s node in FIT (%d)\n", SYSFW_CFG_BOARD,
		      ret);

	/* Apply board configuration to SYSFW */
	ret = board_ops->board_config(ti_sci,
				      (u64)(u32)cfg_fragment_addr,
				      (u32)cfg_fragment_size);
	if (ret)
		panic("Failed to set board configuration (%d)\n", ret);

	/* Extract power/clock (PM) specific configuration from FIT */
	ret = fit_get_data_by_name(fit, images, SYSFW_CFG_PM,
				   &cfg_fragment_addr, &cfg_fragment_size);
	if (ret < 0)
		panic("Error accessing %s node in FIT (%d)\n", SYSFW_CFG_PM,
		      ret);

	/* Apply power/clock (PM) specific configuration to SYSFW */
	if (!IS_ENABLED(CONFIG_K3_DM_FW)) {
		ret = board_ops->board_config_pm(ti_sci,
						 (u64)(u32)cfg_fragment_addr,
						 (u32)cfg_fragment_size);
		if (ret)
			panic("Failed to set board PM configuration (%d)\n", ret);
	} else {
		/* Initialize shared memory boardconfig buffer */
		buf = (u8 *)COMMON_HEADER_ADDRESS;
		common_header = (struct extboot_header *)buf;

		/* Check if we have a struct populated by ROM in memory already */
		if (strcmp((char *)common_header->magic, "EXTBOOT"))
			copy_bcfg = true;

		if (copy_bcfg) {
			strcpy((char *)common_header->magic, "EXTBOOT");
			common_header->num_comps = 1;

			comp = &common_header->comps[0];

			comp->comp_type = COMP_TYPE_SBL_DATA;
			comp->boot_core = 0x10;
			comp->comp_opts = 0;
			addr = (u32)BOARDCFG_ADDRESS;
			comp->dest_addr = addr;
			comp->comp_size = sizeof(*bcfg_header);

			bcfg_header = (struct bcfg_header *)addr;

			bcfg_header->num_elems = 2;
			bcfg_header->sw_rev = 0;

			desc = &bcfg_header->descs[0];

			desc->type = BOARD_CONFIG_PM_DESC_TYPE;
			desc->offset = sizeof(*bcfg_header);
			desc->size = cfg_fragment_size;
			comp->comp_size += desc->size;
			desc->devgrp = 0;
			desc->reserved = 0;
			memcpy((u8 *)bcfg_header + desc->offset,
			       cfg_fragment_addr, cfg_fragment_size);

			bcfg_header->descs[1].offset = desc->offset + desc->size;
		}
	}

	/* Extract resource management (RM) specific configuration from FIT */
	ret = fit_get_data_by_name(fit, images, SYSFW_CFG_RM,
				   &cfg_fragment_addr, &cfg_fragment_size);
	if (ret < 0)
		panic("Error accessing %s node in FIT (%d)\n", SYSFW_CFG_RM,
		      ret);

	if (copy_bcfg) {
		desc = &bcfg_header->descs[1];

		desc->type = BOARD_CONFIG_RM_DESC_TYPE;
		desc->size = cfg_fragment_size;
		comp->comp_size += desc->size;
		desc->devgrp = 0;
		desc->reserved = 0;
		memcpy((u8 *)bcfg_header + desc->offset, cfg_fragment_addr,
		       cfg_fragment_size);
	}

	/* Apply resource management (RM) configuration to SYSFW */
	ret = board_ops->board_config_rm(ti_sci,
					 (u64)(u32)cfg_fragment_addr,
					 (u32)cfg_fragment_size);
	if (ret)
		panic("Failed to set board RM configuration (%d)\n", ret);

	/* Extract security specific configuration from FIT */
	ret = fit_get_data_by_name(fit, images, SYSFW_CFG_SEC,
				   &cfg_fragment_addr, &cfg_fragment_size);
	if (ret < 0)
		panic("Error accessing %s node in FIT (%d)\n", SYSFW_CFG_SEC,
		      ret);

	/* Apply security configuration to SYSFW */
	ret = board_ops->board_config_security(ti_sci,
					       (u64)(u32)cfg_fragment_addr,
					       (u32)cfg_fragment_size);
	if (ret)
		panic("Failed to set board security configuration (%d)\n",
		      ret);
}

#if CONFIG_IS_ENABLED(DFU)
static int k3_sysfw_dfu_download(void *addr)
{
	char dfu_str[50];
	int ret;

	sprintf(dfu_str, "sysfw.itb ram 0x%p 0x%x", addr,
		CONFIG_K3_SYSFW_IMAGE_SIZE_MAX);
	ret = dfu_config_entities(dfu_str, "ram", "0");
	if (ret) {
		dfu_free_entities();
		goto exit;
	}

	run_usb_dnl_gadget(0, "usb_dnl_dfu");
exit:
	dfu_free_entities();
	return ret;
}
#endif

#if CONFIG_IS_ENABLED(SPI_LOAD)
static void *k3_sysfw_get_spi_addr(void)
{
	struct udevice *dev;
	fdt_addr_t addr;
	int ret;

	ret = uclass_find_device_by_seq(UCLASS_SPI, CONFIG_SF_DEFAULT_BUS,
					&dev);
	if (ret)
		return NULL;

	addr = dev_read_addr_index(dev, 1);
	if (addr == FDT_ADDR_T_NONE)
		return NULL;

	return (void *)(addr + CONFIG_K3_SYSFW_IMAGE_SPI_OFFS);
}

static void k3_sysfw_spi_copy(u32 *dst, u32 *src, size_t len)
{
	size_t i;

	for (i = 0; i < len / sizeof(*dst); i++)
		*dst++ = *src++;
}
#endif

void k3_sysfw_loader(bool rom_loaded_sysfw,
		     void (*config_pm_pre_callback)(void),
		     void (*config_pm_done_callback)(void))
{
	struct spl_image_info spl_image = { 0 };
	struct spl_boot_device bootdev = { 0 };
	struct ti_sci_handle *ti_sci;
#if CONFIG_IS_ENABLED(SPI_LOAD)
	void *sysfw_spi_base;
#endif
	int ret = 0;

	if (rom_loaded_sysfw) {
		k3_start_system_controller(K3_SYSTEM_CONTROLLER_RPROC_ID,
					   rom_loaded_sysfw, 0, 0);
		sysfw_loaded = true;
		return;
	}

	/* Reserve a block of aligned memory for loading the SYSFW image */
	sysfw_load_address = memalign(ARCH_DMA_MINALIGN,
				      CONFIG_K3_SYSFW_IMAGE_SIZE_MAX);
	if (!sysfw_load_address)
		panic("Error allocating %u bytes of memory for SYSFW image\n",
		      CONFIG_K3_SYSFW_IMAGE_SIZE_MAX);

	debug("%s: allocated %u bytes at 0x%p\n", __func__,
	      CONFIG_K3_SYSFW_IMAGE_SIZE_MAX, sysfw_load_address);

	/* Set load address for legacy modes that bypass spl_get_load_buffer */
	spl_image.load_addr = (uintptr_t)sysfw_load_address;

	bootdev.boot_device = spl_boot_device();

	/* Load combined System Controller firmware and config data image */
	switch (bootdev.boot_device) {
#if CONFIG_IS_ENABLED(MMC)
	case BOOT_DEVICE_MMC1:
	case BOOT_DEVICE_MMC2:
	case BOOT_DEVICE_MMC2_2:
		ret = spl_mmc_load(&spl_image, &bootdev,
#ifdef CONFIG_K3_SYSFW_IMAGE_NAME
				   CONFIG_K3_SYSFW_IMAGE_NAME,
#else
				   NULL,
#endif
#ifdef CONFIG_K3_SYSFW_IMAGE_MMCSD_RAW_MODE_PART
				   CONFIG_K3_SYSFW_IMAGE_MMCSD_RAW_MODE_PART,
#else
				   0,
#endif
#ifdef CONFIG_K3_SYSFW_IMAGE_MMCSD_RAW_MODE_SECT
				   CONFIG_K3_SYSFW_IMAGE_MMCSD_RAW_MODE_SECT);
#else
				   0);
#endif
		break;
#endif
#if CONFIG_IS_ENABLED(SPI_LOAD)
	case BOOT_DEVICE_SPI:
		sysfw_spi_base = k3_sysfw_get_spi_addr();
		if (!sysfw_spi_base)
			ret = -ENODEV;
		k3_sysfw_spi_copy(sysfw_load_address, sysfw_spi_base,
				  CONFIG_K3_SYSFW_IMAGE_SIZE_MAX);
		break;
#endif
#if CONFIG_IS_ENABLED(YMODEM_SUPPORT)
	case BOOT_DEVICE_UART:
#ifdef CONFIG_K3_EARLY_CONS
		/*
		 * Establish a serial console if not yet available as required
		 * for UART-based boot. For this use the early console feature
		 * that allows setting up a UART for use before SYSFW has been
		 * brought up. Note that the associated UART module's clocks
		 * must have gotten enabled by the ROM bootcode which will be
		 * the case when continuing to boot serially from the same
		 * UART that the ROM loaded the initial bootloader from.
		 */
		if (!gd->have_console)
			early_console_init();
#endif
		ret = spl_ymodem_load_image(&spl_image, &bootdev);
		break;
#endif
#if CONFIG_IS_ENABLED(DFU)
	case BOOT_DEVICE_DFU:
		ret = k3_sysfw_dfu_download(sysfw_load_address);
		break;
#endif
#if CONFIG_IS_ENABLED(USB_STORAGE)
	case BOOT_DEVICE_USB:
		ret = spl_usb_load(&spl_image, &bootdev,
				   CONFIG_SYS_USB_FAT_BOOT_PARTITION,
#ifdef CONFIG_K3_SYSFW_IMAGE_NAME
				   CONFIG_K3_SYSFW_IMAGE_NAME);
#else
				   NULL);
#endif
#endif
		break;
	default:
		panic("Loading SYSFW image from device %u not supported!\n",
		      bootdev.boot_device);
	}

	if (ret)
		panic("Error %d occurred during loading SYSFW image!\n", ret);

	/*
	 * Now that SYSFW got loaded set helper flag to restore regular SPL
	 * loader behavior so we can later boot into the next stage as expected.
	 */
	sysfw_loaded = true;

	/* Ensure the SYSFW image is in FIT format */
	if (image_get_magic((const image_header_t *)sysfw_load_address) !=
	    FDT_MAGIC)
		panic("SYSFW image not in FIT format!\n");

	/* Extract and start SYSFW */
	k3_sysfw_load_using_fit(sysfw_load_address);

	/* Get handle for accessing SYSFW services */
	ti_sci = get_ti_sci_handle();

	if (config_pm_pre_callback)
		config_pm_pre_callback();

	/* Parse and apply the different SYSFW configuration fragments */
	k3_sysfw_configure_using_fit(sysfw_load_address, ti_sci);

	/*
	 * Now that all clocks and PM aspects are setup, invoke a user-
	 * provided callback function. Usually this callback would be used
	 * to setup or re-configure the U-Boot console UART.
	 */
	if (config_pm_done_callback)
		config_pm_done_callback();
}