arch/arm/cpu/armv7/mx6/hab.c

/*
 * Copyright (C) 2010-2014 Freescale Semiconductor, Inc.
 *
 * SPDX-License-Identifier:    GPL-2.0+
 */

#include <common.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/arch/hab.h>
#include <asm/arch/clock.h>
#include <asm/arch/sys_proto.h>

/* -------- start of HAB API updates ------------*/

#define hab_rvt_report_event_p					\
(								\
	((is_cpu_type(MXC_CPU_MX6Q) ||				\
	  is_cpu_type(MXC_CPU_MX6D)) &&				\
	  (soc_rev() >= CHIP_REV_1_5)) ?			\
	((hab_rvt_report_event_t *)HAB_RVT_REPORT_EVENT_NEW) :	\
	(is_cpu_type(MXC_CPU_MX6DL) &&				\
	 (soc_rev() >= CHIP_REV_1_2)) ?				\
	((hab_rvt_report_event_t *)HAB_RVT_REPORT_EVENT_NEW) :	\
	((hab_rvt_report_event_t *)HAB_RVT_REPORT_EVENT)	\
)

#define hab_rvt_report_status_p					\
(								\
	((is_cpu_type(MXC_CPU_MX6Q) ||				\
	  is_cpu_type(MXC_CPU_MX6D)) &&				\
	  (soc_rev() >= CHIP_REV_1_5)) ?			\
	((hab_rvt_report_status_t *)HAB_RVT_REPORT_STATUS_NEW) :\
	(is_cpu_type(MXC_CPU_MX6DL) &&				\
	 (soc_rev() >= CHIP_REV_1_2)) ?				\
	((hab_rvt_report_status_t *)HAB_RVT_REPORT_STATUS_NEW) :\
	((hab_rvt_report_status_t *)HAB_RVT_REPORT_STATUS)	\
)

#define hab_rvt_authenticate_image_p				\
(								\
	((is_cpu_type(MXC_CPU_MX6Q) ||				\
	  is_cpu_type(MXC_CPU_MX6D)) &&				\
	  (soc_rev() >= CHIP_REV_1_5)) ?			\
	((hab_rvt_authenticate_image_t *)HAB_RVT_AUTHENTICATE_IMAGE_NEW) : \
	(is_cpu_type(MXC_CPU_MX6DL) &&				\
	 (soc_rev() >= CHIP_REV_1_2)) ?				\
	((hab_rvt_authenticate_image_t *)HAB_RVT_AUTHENTICATE_IMAGE_NEW) : \
	((hab_rvt_authenticate_image_t *)HAB_RVT_AUTHENTICATE_IMAGE)	\
)

#define hab_rvt_entry_p						\
(								\
	((is_cpu_type(MXC_CPU_MX6Q) ||				\
	  is_cpu_type(MXC_CPU_MX6D)) &&				\
	  (soc_rev() >= CHIP_REV_1_5)) ?			\
	((hab_rvt_entry_t *)HAB_RVT_ENTRY_NEW) :		\
	(is_cpu_type(MXC_CPU_MX6DL) &&				\
	 (soc_rev() >= CHIP_REV_1_2)) ?				\
	((hab_rvt_entry_t *)HAB_RVT_ENTRY_NEW) :		\
	((hab_rvt_entry_t *)HAB_RVT_ENTRY)			\
)

#define hab_rvt_exit_p						\
(								\
	((is_cpu_type(MXC_CPU_MX6Q) ||				\
	  is_cpu_type(MXC_CPU_MX6D)) &&				\
	  (soc_rev() >= CHIP_REV_1_5)) ?			\
	((hab_rvt_exit_t *)HAB_RVT_EXIT_NEW) :			\
	(is_cpu_type(MXC_CPU_MX6DL) &&				\
	 (soc_rev() >= CHIP_REV_1_2)) ?				\
	((hab_rvt_exit_t *)HAB_RVT_EXIT_NEW) :			\
	((hab_rvt_exit_t *)HAB_RVT_EXIT)			\
)

#define IVT_SIZE		0x20
#define ALIGN_SIZE		0x1000
#define CSF_PAD_SIZE		0x2000
#define MX6DQ_PU_IROM_MMU_EN_VAR	0x009024a8
#define MX6DLS_PU_IROM_MMU_EN_VAR	0x00901dd0
#define MX6SL_PU_IROM_MMU_EN_VAR	0x00900a18

/*
 * +------------+  0x0 (DDR_UIMAGE_START) -
 * |   Header   |                          |
 * +------------+  0x40                    |
 * |            |                          |
 * |            |                          |
 * |            |                          |
 * |            |                          |
 * | Image Data |                          |
 * .            |                          |
 * .            |                           > Stuff to be authenticated ----+
 * .            |                          |                                |
 * |            |                          |                                |
 * |            |                          |                                |
 * +------------+                          |                                |
 * |            |                          |                                |
 * | Fill Data  |                          |                                |
 * |            |                          |                                |
 * +------------+ Align to ALIGN_SIZE      |                                |
 * |    IVT     |                          |                                |
 * +------------+ + IVT_SIZE              -                                 |
 * |            |                                                           |
 * |  CSF DATA  | <---------------------------------------------------------+
 * |            |
 * +------------+
 * |            |
 * | Fill Data  |
 * |            |
 * +------------+ + CSF_PAD_SIZE
 */

bool is_hab_enabled(void)
{
	struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
	struct fuse_bank *bank = &ocotp->bank[0];
	struct fuse_bank0_regs *fuse =
		(struct fuse_bank0_regs *)bank->fuse_regs;
	uint32_t reg = readl(&fuse->cfg5);

	return (reg & 0x2) == 0x2;
}

void display_event(uint8_t *event_data, size_t bytes)
{
	uint32_t i;

	if (!(event_data && bytes > 0))
		return;

	for (i = 0; i < bytes; i++) {
		if (i == 0)
			printf("\t0x%02x", event_data[i]);
		else if ((i % 8) == 0)
			printf("\n\t0x%02x", event_data[i]);
		else
			printf(" 0x%02x", event_data[i]);
	}
}

int get_hab_status(void)
{
	uint32_t index = 0; /* Loop index */
	uint8_t event_data[128]; /* Event data buffer */
	size_t bytes = sizeof(event_data); /* Event size in bytes */
	enum hab_config config = 0;
	enum hab_state state = 0;
	hab_rvt_report_event_t *hab_rvt_report_event;
	hab_rvt_report_status_t *hab_rvt_report_status;

	hab_rvt_report_event = hab_rvt_report_event_p;
	hab_rvt_report_status = hab_rvt_report_status_p;

	if (is_hab_enabled())
		puts("\nSecure boot enabled\n");
	else
		puts("\nSecure boot disabled\n");

	/* Check HAB status */
	if (hab_rvt_report_status(&config, &state) != HAB_SUCCESS) {
		printf("\nHAB Configuration: 0x%02x, HAB State: 0x%02x\n",
		       config, state);

		/* Display HAB Error events */
		while (hab_rvt_report_event(HAB_FAILURE, index, event_data,
					&bytes) == HAB_SUCCESS) {
			puts("\n");
			printf("--------- HAB Event %d -----------------\n",
			       index + 1);
			puts("event data:\n");
			display_event(event_data, bytes);
			puts("\n");
			bytes = sizeof(event_data);
			index++;
		}
	}
	/* Display message if no HAB events are found */
	else {
		printf("\nHAB Configuration: 0x%02x, HAB State: 0x%02x\n",
		       config, state);
		puts("No HAB Events Found!\n\n");
	}
	return 0;
}

uint32_t authenticate_image(uint32_t ddr_start, uint32_t image_size)
{
	uint32_t load_addr = 0;
	size_t bytes;
	ptrdiff_t ivt_offset = 0;
	int result = 0;
	ulong start;
	hab_rvt_authenticate_image_t *hab_rvt_authenticate_image;
	hab_rvt_entry_t *hab_rvt_entry;
	hab_rvt_exit_t *hab_rvt_exit;

	hab_rvt_authenticate_image = hab_rvt_authenticate_image_p;
	hab_rvt_entry = hab_rvt_entry_p;
	hab_rvt_exit = hab_rvt_exit_p;

	if (is_hab_enabled()) {
		printf("\nAuthenticate image from DDR location 0x%x...\n",
		       ddr_start);

		hab_caam_clock_enable(1);

		if (hab_rvt_entry() == HAB_SUCCESS) {
			/* If not already aligned, Align to ALIGN_SIZE */
			ivt_offset = (image_size + ALIGN_SIZE - 1) &
					~(ALIGN_SIZE - 1);

			start = ddr_start;
			bytes = ivt_offset + IVT_SIZE + CSF_PAD_SIZE;
#ifdef DEBUG
			printf("\nivt_offset = 0x%x, ivt addr = 0x%x\n",
			       ivt_offset, ddr_start + ivt_offset);
			puts("Dumping IVT\n");
			print_buffer(ddr_start + ivt_offset,
				     (void *)(ddr_start + ivt_offset),
				     4, 0x8, 0);

			puts("Dumping CSF Header\n");
			print_buffer(ddr_start + ivt_offset+IVT_SIZE,
				     (void *)(ddr_start + ivt_offset+IVT_SIZE),
				     4, 0x10, 0);

			get_hab_status();

			puts("\nCalling authenticate_image in ROM\n");
			printf("\tivt_offset = 0x%x\n", ivt_offset);
			printf("\tstart = 0x%08lx\n", start);
			printf("\tbytes = 0x%x\n", bytes);
#endif
			/*
			 * If the MMU is enabled, we have to notify the ROM
			 * code, or it won't flush the caches when needed.
			 * This is done, by setting the "pu_irom_mmu_enabled"
			 * word to 1. You can find its address by looking in
			 * the ROM map. This is critical for
			 * authenticate_image(). If MMU is enabled, without
			 * setting this bit, authentication will fail and may
			 * crash.
			 */
			/* Check MMU enabled */
			if (get_cr() & CR_M) {
				if (is_cpu_type(MXC_CPU_MX6Q) ||
				    is_cpu_type(MXC_CPU_MX6D)) {
					/*
					 * This won't work on Rev 1.0.0 of
					 * i.MX6Q/D, since their ROM doesn't
					 * do cache flushes. don't think any
					 * exist, so we ignore them.
					 */
					writel(1, MX6DQ_PU_IROM_MMU_EN_VAR);
				} else if (is_cpu_type(MXC_CPU_MX6DL) ||
					   is_cpu_type(MXC_CPU_MX6SOLO)) {
					writel(1, MX6DLS_PU_IROM_MMU_EN_VAR);
				} else if (is_cpu_type(MXC_CPU_MX6SL)) {
					writel(1, MX6SL_PU_IROM_MMU_EN_VAR);
				}
			}

			load_addr = (uint32_t)hab_rvt_authenticate_image(
					HAB_CID_UBOOT,
					ivt_offset, (void **)&start,
					(size_t *)&bytes, NULL);
			if (hab_rvt_exit() != HAB_SUCCESS) {
				puts("hab exit function fail\n");
				load_addr = 0;
			}
		} else {
			puts("hab entry function fail\n");
		}

		hab_caam_clock_enable(0);

		get_hab_status();
	} else {
		puts("hab fuse not enabled\n");
	}

	if ((!is_hab_enabled()) || (load_addr != 0))
		result = 1;

	return result;
}

int do_hab_status(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	if ((argc != 1)) {
		cmd_usage(cmdtp);
		return 1;
	}

	get_hab_status();

	return 0;
}

static int do_authenticate_image(cmd_tbl_t *cmdtp, int flag, int argc,
				char * const argv[])
{
	ulong	addr, ivt_offset;
	int	rcode = 0;

	if (argc < 3)
		return CMD_RET_USAGE;

	addr = simple_strtoul(argv[1], NULL, 16);
	ivt_offset = simple_strtoul(argv[2], NULL, 16);

	rcode = authenticate_image(addr, ivt_offset);

	return rcode;
}

U_BOOT_CMD(
		hab_status, CONFIG_SYS_MAXARGS, 1, do_hab_status,
		"display HAB status",
		""
	  );

U_BOOT_CMD(
		hab_auth_img, 3, 0, do_authenticate_image,
		"authenticate image via HAB",
		"addr ivt_offset\n"
		"addr - image hex address\n"
		"ivt_offset - hex offset of IVT in the image"
	  );