powerpc/mpc85xx: SECURE BOOT- Enable chain of trust in SPL

As part of Chain of Trust for Secure boot, the SPL U-Boot will validate
the next level U-boot image. Add a new function spl_validate_uboot to
perform the validation.

Enable hardware crypto operations in SPL using SEC block.
In case of Secure Boot, PAMU is not bypassed. For allowing SEC block
access to CPC configured as SRAM, configure PAMU.

Reviewed-by: Ruchika Gupta <ruchika.gupta@nxp.com>
Signed-off-by: Aneesh Bansal <aneesh.bansal@nxp.com>
Signed-off-by: Sumit Garg <sumit.garg@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: York Sun <york.sun@nxp.com>

arch/powerpc/cpu/mpc8xxx/fsl_pamu.c

@@ -239,15 +239,23 @@ int pamu_init(void)
 	spaact_size = sizeof(struct paace) * NUM_SPAACT_ENTRIES;
 
 	/* Allocate space for Primary PAACT Table */
+#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_PPAACT_ADDR))
+	ppaact = (void *)CONFIG_SPL_PPAACT_ADDR;
+#else
 	ppaact = memalign(PAMU_TABLE_ALIGNMENT, ppaact_size);
 	if (!ppaact)
 		return -1;
+#endif
 	memset(ppaact, 0, ppaact_size);
 
 	/* Allocate space for Secondary PAACT Table */
+#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_SPAACT_ADDR))
+	sec = (void *)CONFIG_SPL_SPAACT_ADDR;
+#else
 	sec = memalign(PAMU_TABLE_ALIGNMENT, spaact_size);
 	if (!sec)
 		return -1;
+#endif
 	memset(sec, 0, spaact_size);
 
 	ppaact_phys = virt_to_phys((void *)ppaact);

arch/powerpc/cpu/mpc8xxx/pamu_table.c

@@ -28,6 +28,14 @@ void construct_pamu_addr_table(struct pamu_addr_tbl *tbl, int *num_entries)
 
 	i++;
 #endif
+#if (defined(CONFIG_SPL_BUILD) && (CONFIG_SYS_INIT_L3_VADDR))
+	tbl->start_addr[i] =
+		(uint64_t)virt_to_phys((void *)CONFIG_SYS_INIT_L3_VADDR);
+	tbl->size[i] = 256 * 1024; /* 256K CPC flash */
+	tbl->end_addr[i] = tbl->start_addr[i] +  tbl->size[i] - 1;
+
+	i++;
+#endif
 	debug("PAMU address\t\t\tsize\n");
 	for (j = 0; j < i ; j++)
 		debug("%llx \t\t\t%llx\n",  tbl->start_addr[j],  tbl->size[j]);

arch/powerpc/include/asm/fsl_secure_boot.h

@@ -72,6 +72,32 @@
 
 #ifdef CONFIG_CHAIN_OF_TRUST
 
+#ifdef CONFIG_SPL_BUILD
+#define CONFIG_SPL_DM			1
+#define CONFIG_SPL_CRYPTO_SUPPORT
+#define CONFIG_SPL_HASH_SUPPORT
+#define CONFIG_SPL_RSA
+#define CONFIG_SPL_DRIVERS_MISC_SUPPORT
+/*
+ * PPAACT and SPAACT table for PAMU must be placed on DDR after DDR init
+ * due to space crunch on CPC and thus malloc will not work.
+ */
+#define CONFIG_SPL_PPAACT_ADDR		0x2e000000
+#define CONFIG_SPL_SPAACT_ADDR		0x2f000000
+#define CONFIG_SPL_JR0_LIODN_S		454
+#define CONFIG_SPL_JR0_LIODN_NS		458
+/*
+ * Define the key hash for U-Boot here if public/private key pair used to
+ * sign U-boot are different from the SRK hash put in the fuse
+ * Example of defining KEY_HASH is
+ * #define CONFIG_SPL_UBOOT_KEY_HASH \
+ *      "41066b564c6ffcef40ccbc1e0a5d0d519604000c785d97bbefd25e4d288d1c8b"
+ * else leave it defined as NULL
+ */
+
+#define CONFIG_SPL_UBOOT_KEY_HASH	NULL
+#endif /* ifdef CONFIG_SPL_BUILD */
+
 #define CONFIG_CMD_ESBC_VALIDATE
 #define CONFIG_CMD_BLOB
 #define CONFIG_FSL_SEC_MON
@@ -82,7 +108,9 @@
 #define CONFIG_FSL_CAAM
 #endif
 
-/* fsl_setenv_chain_of_trust() must be called from
+#ifndef CONFIG_SPL_BUILD
+/*
+ * fsl_setenv_chain_of_trust() must be called from
  * board_late_init()
  */
 #ifndef CONFIG_BOARD_LATE_INIT
@@ -119,5 +147,6 @@
 #endif /* #ifdef CONFIG_BOOTSCRIPT_COPY_RAM */
 
 #include <config_fsl_chain_trust.h>
+#endif /* #ifndef CONFIG_SPL_BUILD */
 #endif /* #ifdef CONFIG_CHAIN_OF_TRUST */
 #endif

board/freescale/common/fsl_chain_of_trust.c

@@ -6,7 +6,17 @@
 
 #include <common.h>
 #include <fsl_validate.h>
+#include <fsl_secboot_err.h>
 #include <fsl_sfp.h>
+#include <dm/root.h>
+
+#ifdef CONFIG_ADDR_MAP
+#include <asm/mmu.h>
+#endif
+
+#ifdef CONFIG_FSL_CORENET
+#include <asm/fsl_pamu.h>
+#endif
 
 #ifdef CONFIG_LS102XA
 #include <asm/arch/immap_ls102xa.h>
@@ -52,6 +62,7 @@ int fsl_check_boot_mode_secure(void)
 	return 0;
 }
 
+#ifndef CONFIG_SPL_BUILD
 int fsl_setenv_chain_of_trust(void)
 {
 	/* Check Boot Mode
@@ -68,3 +79,48 @@ int fsl_setenv_chain_of_trust(void)
 	setenv("bootcmd", CONFIG_CHAIN_BOOT_CMD);
 	return 0;
 }
+#endif
+
+#ifdef CONFIG_SPL_BUILD
+void spl_validate_uboot(uint32_t hdr_addr, uintptr_t img_addr)
+{
+	int res;
+
+	/*
+	 * Check Boot Mode
+	 * If Boot Mode is Non-Secure, skip validation
+	 */
+	if (fsl_check_boot_mode_secure() == 0)
+		return;
+
+	printf("SPL: Validating U-Boot image\n");
+
+#ifdef CONFIG_ADDR_MAP
+	init_addr_map();
+#endif
+
+#ifdef CONFIG_FSL_CORENET
+	if (pamu_init() < 0)
+		fsl_secboot_handle_error(ERROR_ESBC_PAMU_INIT);
+#endif
+
+#ifdef CONFIG_FSL_CAAM
+	if (sec_init() < 0)
+		fsl_secboot_handle_error(ERROR_ESBC_SEC_INIT);
+#endif
+
+/*
+ * dm_init_and_scan() is called as part of common SPL framework, so no
+ * need to call it again but in case of powerpc platforms which currently
+ * do not use common SPL framework, so need to call this function here.
+ */
+#if defined(CONFIG_SPL_DM) && (!defined(CONFIG_SPL_FRAMEWORK))
+	dm_init_and_scan(false);
+#endif
+	res = fsl_secboot_validate(hdr_addr, CONFIG_SPL_UBOOT_KEY_HASH,
+				   &img_addr);
+
+	if (res == 0)
+		printf("SPL: Validation of U-boot successful\n");
+}
+#endif /* ifdef CONFIG_SPL_BUILD */

drivers/crypto/fsl/jr.c

@@ -599,10 +599,27 @@ int sec_init_idx(uint8_t sec_idx)
 	sec_out32(&sec->mcfgr, mcr);
 
 #ifdef CONFIG_FSL_CORENET
+#ifdef CONFIG_SPL_BUILD
+	/*
+	 * For SPL Build, Set the Liodns in SEC JR0 for
+	 * creating PAMU entries corresponding to these.
+	 * For normal build, these are set in set_liodns().
+	 */
+	liodn_ns = CONFIG_SPL_JR0_LIODN_NS & JRNSLIODN_MASK;
+	liodn_s = CONFIG_SPL_JR0_LIODN_S & JRSLIODN_MASK;
+
+	liodnr = sec_in32(&sec->jrliodnr[0].ls) &
+		 ~(JRNSLIODN_MASK | JRSLIODN_MASK);
+	liodnr = liodnr |
+		 (liodn_ns << JRNSLIODN_SHIFT) |
+		 (liodn_s << JRSLIODN_SHIFT);
+	sec_out32(&sec->jrliodnr[0].ls, liodnr);
+#else
 	liodnr = sec_in32(&sec->jrliodnr[0].ls);
 	liodn_ns = (liodnr & JRNSLIODN_MASK) >> JRNSLIODN_SHIFT;
 	liodn_s = (liodnr & JRSLIODN_MASK) >> JRSLIODN_SHIFT;
 #endif
+#endif
 
 	ret = jr_init(sec_idx);
 	if (ret < 0) {

drivers/mtd/nand/fsl_ifc_spl.c

@@ -11,6 +11,9 @@
 #include <asm/io.h>
 #include <fsl_ifc.h>
 #include <linux/mtd/nand.h>
+#ifdef CONFIG_CHAIN_OF_TRUST
+#include <fsl_validate.h>
+#endif
 
 static inline int is_blank(uchar *addr, int page_size)
 {
@@ -268,6 +271,27 @@ void nand_boot(void)
 	 */
 	flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
 #endif
+
+#ifdef CONFIG_CHAIN_OF_TRUST
+	/*
+	 * U-Boot header is appended at end of U-boot image, so
+	 * calculate U-boot header address using U-boot header size.
+	 */
+#define CONFIG_U_BOOT_HDR_ADDR \
+		((CONFIG_SYS_NAND_U_BOOT_START + \
+		  CONFIG_SYS_NAND_U_BOOT_SIZE) - \
+		 CONFIG_U_BOOT_HDR_SIZE)
+	spl_validate_uboot(CONFIG_U_BOOT_HDR_ADDR,
+			   CONFIG_SYS_NAND_U_BOOT_START);
+	/*
+	 * In case of failure in validation, spl_validate_uboot would
+	 * not return back in case of Production environment with ITS=1.
+	 * Thus U-Boot will not start.
+	 * In Development environment (ITS=0 and SB_EN=1), the function
+	 * may return back in case of non-fatal failures.
+	 */
+#endif
+
 	uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
 	uboot();
 }

include/fsl_validate.h

@@ -254,4 +254,11 @@ int fsl_secboot_blob_decap(cmd_tbl_t *cmdtp, int flag, int argc,
 
 int fsl_check_boot_mode_secure(void);
 int fsl_setenv_chain_of_trust(void);
+
+/*
+ * This function is used to validate the main U-boot binary from
+ * SPL just before passing control to it using QorIQ Trust
+ * Architecture header (appended to U-boot image).
+ */
+void spl_validate_uboot(uint32_t hdr_addr, uintptr_t img_addr);
 #endif