imx: add rom api support

i.MX8MN support loading images with rom api, so we implement
reuse board_return_to_bootrom to let ROM loading images.

Signed-off-by: Peng Fan <peng.fan@nxp.com>

arch/arm/include/asm/mach-imx/sys_proto.h

@@ -111,6 +111,39 @@ void gpr_init(void);
 
 #endif /* CONFIG_MX6 */
 
+#ifdef CONFIG_IMX8M
+struct rom_api {
+	u16 ver;
+	u16 tag;
+	u32 reserved1;
+	u32 (*download_image)(u8 *dest, u32 offset, u32 size,  u32 xor);
+	u32 (*query_boot_infor)(u32 info_type, u32 *info, u32 xor);
+};
+
+enum boot_dev_type_e {
+	BT_DEV_TYPE_SD = 1,
+	BT_DEV_TYPE_MMC = 2,
+	BT_DEV_TYPE_NAND = 3,
+	BT_DEV_TYPE_FLEXSPINOR = 4,
+
+	BT_DEV_TYPE_USB = 0xE,
+	BT_DEV_TYPE_MEM_DEV = 0xF,
+
+	BT_DEV_TYPE_INVALID = 0xFF
+};
+
+#define QUERY_ROM_VER		1
+#define QUERY_BT_DEV		2
+#define QUERY_PAGE_SZ		3
+#define QUERY_IVT_OFF		4
+#define QUERY_BT_STAGE		5
+#define QUERY_IMG_OFF		6
+
+#define ROM_API_OKAY		0xF0
+
+extern struct rom_api *g_rom_api;
+#endif
+
 u32 get_nr_cpus(void);
 u32 get_cpu_rev(void);
 u32 get_cpu_speed_grade_hz(void);

arch/arm/mach-imx/Kconfig

@@ -83,3 +83,7 @@ config NXP_BOARD_REVISION
 	  NXP boards based on i.MX6/7 contain the board revision information
 	  stored in the fuses. Select this option if you want to be able to
 	  retrieve the board revision information.
+
+config SPL_IMX_ROMAPI_LOADADDR
+	hex "Default load address to load image through ROM API"
+	depends on IMX8MN

arch/arm/mach-imx/Makefile

@@ -187,3 +187,5 @@ obj-$(CONFIG_MX6) += mx6/
 obj-$(CONFIG_MX7) += mx7/
 obj-$(CONFIG_ARCH_MX7ULP) += mx7ulp/
 obj-$(CONFIG_IMX8M) += imx8m/
+
+obj-$(CONFIG_SPL_BOOTROM_SUPPORT) += spl_imx_romapi.o

arch/arm/mach-imx/spl_imx_romapi.c

@@ -0,0 +1,292 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 NXP
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <image.h>
+#include <linux/libfdt.h>
+#include <spl.h>
+
+#include <asm/arch/sys_proto.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int is_boot_from_stream_device(u32 boot)
+{
+	u32 interface;
+
+	interface = boot >> 16;
+	if (interface >= BT_DEV_TYPE_USB)
+		return 1;
+
+	if (interface == BT_DEV_TYPE_MMC && (boot & 1))
+		return 1;
+
+	return 0;
+}
+
+static ulong spl_romapi_read_seekable(struct spl_load_info *load,
+				      ulong sector, ulong count,
+				      void *buf)
+{
+	u32 pagesize = *(u32 *)load->priv;
+	volatile gd_t *pgd = gd;
+	ulong byte = count * pagesize;
+	int ret;
+	u32 offset;
+
+	offset = sector * pagesize;
+
+	debug("ROM API load from 0x%x, size 0x%x\n", offset, (u32)byte);
+
+	ret = g_rom_api->download_image(buf, offset, byte,
+					((uintptr_t)buf) ^ offset ^ byte);
+	gd = pgd;
+
+	if (ret == ROM_API_OKAY)
+		return count;
+
+	printf("ROM API Failure when load 0x%x\n", offset);
+
+	return 0;
+}
+
+static int spl_romapi_load_image_seekable(struct spl_image_info *spl_image,
+					  struct spl_boot_device *bootdev,
+					  u32 rom_bt_dev)
+{
+	volatile gd_t *pgd = gd;
+	int ret;
+	u32 offset;
+	u32 pagesize, size;
+	struct image_header *header;
+	u32 image_offset;
+
+	ret = g_rom_api->query_boot_infor(QUERY_IVT_OFF, &offset,
+					  ((uintptr_t)&offset) ^ QUERY_IVT_OFF);
+	ret |= g_rom_api->query_boot_infor(QUERY_PAGE_SZ, &pagesize,
+					   ((uintptr_t)&pagesize) ^ QUERY_PAGE_SZ);
+	ret |= g_rom_api->query_boot_infor(QUERY_IMG_OFF, &image_offset,
+					   ((uintptr_t)&image_offset) ^ QUERY_IMG_OFF);
+
+	gd = pgd;
+
+	if (ret != ROM_API_OKAY) {
+		puts("ROMAPI: Failure query boot infor pagesize/offset\n");
+		return -1;
+	}
+
+	header = (struct image_header *)(CONFIG_SPL_IMX_ROMAPI_LOADADDR);
+
+	printf("image offset 0x%x, pagesize 0x%x, ivt offset 0x%x\n",
+	       image_offset, pagesize, offset);
+
+	if (((rom_bt_dev >> 16) & 0xff) ==  BT_DEV_TYPE_FLEXSPINOR)
+		offset = CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR * 512;
+	else
+		offset = image_offset +
+			CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR * 512 - 0x8000;
+
+	size = ALIGN(sizeof(struct image_header), pagesize);
+	ret = g_rom_api->download_image((u8 *)header, offset, size,
+					((uintptr_t)header) ^ offset ^ size);
+	gd = pgd;
+
+	if (ret != ROM_API_OKAY) {
+		printf("ROMAPI: download failure offset 0x%x size 0x%x\n",
+		       offset, size);
+		return -1;
+	}
+
+	if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
+	    image_get_magic(header) == FDT_MAGIC) {
+		struct spl_load_info load;
+
+		memset(&load, 0, sizeof(load));
+		load.bl_len = pagesize;
+		load.read = spl_romapi_read_seekable;
+		load.priv = &pagesize;
+		return spl_load_simple_fit(spl_image, &load,
+					   offset / pagesize, header);
+	} else {
+		/* TODO */
+		puts("Can't support legacy image\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static ulong spl_ram_load_read(struct spl_load_info *load, ulong sector,
+			       ulong count, void *buf)
+{
+	memcpy(buf, (void *)(sector), count);
+
+	if (load->priv) {
+		ulong *p = (ulong *)load->priv;
+		ulong total = sector + count;
+
+		if (total > *p)
+			*p = total;
+	}
+
+	return count;
+}
+
+static ulong get_fit_image_size(void *fit)
+{
+	struct spl_image_info spl_image;
+	struct spl_load_info spl_load_info;
+	ulong last = (ulong)fit;
+
+	memset(&spl_load_info, 0, sizeof(spl_load_info));
+	spl_load_info.bl_len = 1;
+	spl_load_info.read = spl_ram_load_read;
+	spl_load_info.priv = &last;
+
+	spl_load_simple_fit(&spl_image, &spl_load_info,
+			    (uintptr_t)fit, fit);
+
+	return last - (ulong)fit;
+}
+
+u8 *search_fit_header(u8 *p, int size)
+{
+	int i;
+
+	for (i = 0; i < size; i += 4)
+		if (genimg_get_format(p + i) == IMAGE_FORMAT_FIT)
+			return p + i;
+
+	return NULL;
+}
+
+static int spl_romapi_load_image_stream(struct spl_image_info *spl_image,
+					struct spl_boot_device *bootdev)
+{
+	struct spl_load_info load;
+	volatile gd_t *pgd = gd;
+	u32 pagesize, pg;
+	int ret;
+	int i = 0;
+	u8 *p = (u8 *)CONFIG_SPL_IMX_ROMAPI_LOADADDR;
+	u8 *pfit = NULL;
+	int imagesize;
+	int total;
+
+	ret = g_rom_api->query_boot_infor(QUERY_PAGE_SZ, &pagesize,
+					  ((uintptr_t)&pagesize) ^ QUERY_PAGE_SZ);
+	gd = pgd;
+
+	if (ret != ROM_API_OKAY)
+		puts("failure at query_boot_info\n");
+
+	pg = pagesize;
+	if (pg < 1024)
+		pg = 1024;
+
+	for (i = 0; i < 640; i++) {
+		ret = g_rom_api->download_image(p, 0, pg,
+						((uintptr_t)p) ^ pg);
+		gd = pgd;
+
+		if (ret != ROM_API_OKAY) {
+			puts("Steam(USB) download failure\n");
+			return -1;
+		}
+
+		pfit = search_fit_header(p, pg);
+		p += pg;
+
+		if (pfit)
+			break;
+	}
+
+	if (!pfit) {
+		puts("Can't found uboot FIT image in 640K range \n");
+		return -1;
+	}
+
+	if (p - pfit < sizeof(struct fdt_header)) {
+		ret = g_rom_api->download_image(p, 0, pg,  ((uintptr_t)p) ^ pg);
+		gd = pgd;
+
+		if (ret != ROM_API_OKAY) {
+			puts("Steam(USB) download failure\n");
+			return -1;
+		}
+
+		p += pg;
+	}
+
+	imagesize = fit_get_size(pfit);
+	printf("Find FIT header 0x&%p, size %d\n", pfit, imagesize);
+
+	if (p - pfit < imagesize) {
+		imagesize -= p - pfit;
+		/*need pagesize hear after ROM fix USB problme*/
+		imagesize += pg - 1;
+		imagesize /= pg;
+		imagesize *= pg;
+
+		printf("Need continue download %d\n", imagesize);
+
+		ret = g_rom_api->download_image(p, 0, imagesize,
+						((uintptr_t)p) ^ imagesize);
+		gd = pgd;
+
+		p += imagesize;
+
+		if (ret != ROM_API_OKAY) {
+			printf("Failure download %d\n", imagesize);
+			return -1;
+		}
+	}
+
+	total = get_fit_image_size(pfit);
+	total += 3;
+	total &= ~0x3;
+
+	imagesize = total - (p - pfit);
+
+	imagesize += pagesize - 1;
+	imagesize /= pagesize;
+	imagesize *= pagesize;
+
+	printf("Download %d, total fit %d\n", imagesize, total);
+
+	ret = g_rom_api->download_image(p, 0, imagesize,
+					((uintptr_t)p) ^ imagesize);
+	if (ret != ROM_API_OKAY)
+		printf("ROM download failure %d\n", imagesize);
+
+	memset(&load, 0, sizeof(load));
+	load.bl_len = 1;
+	load.read = spl_ram_load_read;
+
+	return spl_load_simple_fit(spl_image, &load, (ulong)pfit, pfit);
+}
+
+int _board_return_to_bootrom(struct spl_image_info *spl_image,
+			    struct spl_boot_device *bootdev)
+{
+	volatile gd_t *pgd = gd;
+	int ret;
+	u32 boot;
+
+	ret = g_rom_api->query_boot_infor(QUERY_BT_DEV, &boot,
+					  ((uintptr_t)&boot) ^ QUERY_BT_DEV);
+	gd =  pgd;
+
+	if (ret != ROM_API_OKAY) {
+		puts("ROMAPI: failure at query_boot_info\n");
+		return -1;
+	}
+
+	if (is_boot_from_stream_device(boot))
+		return spl_romapi_load_image_stream(spl_image, bootdev);
+
+	return spl_romapi_load_image_seekable(spl_image, bootdev, boot);
+}