1 /*
2  * Copyright 2015 Freescale Semiconductor, Inc.
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <fsl_validate.h>
9 #include <fsl_secboot_err.h>
10 #include <fsl_sfp.h>
11 #include <dm/root.h>
12 
13 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_FRAMEWORK)
14 #include <spl.h>
15 #endif
16 
17 #ifdef CONFIG_ADDR_MAP
18 #include <asm/mmu.h>
19 #endif
20 
21 #ifdef CONFIG_FSL_CORENET
22 #include <asm/fsl_pamu.h>
23 #endif
24 
25 #ifdef CONFIG_LS102XA
26 #include <asm/arch/immap_ls102xa.h>
27 #endif
28 
29 #if defined(CONFIG_MPC85xx)
30 #define CONFIG_DCFG_ADDR	CONFIG_SYS_MPC85xx_GUTS_ADDR
31 #else
32 #define CONFIG_DCFG_ADDR	CONFIG_SYS_FSL_GUTS_ADDR
33 #endif
34 
35 #ifdef CONFIG_SYS_FSL_CCSR_GUR_LE
36 #define gur_in32(a)       in_le32(a)
37 #else
38 #define gur_in32(a)       in_be32(a)
39 #endif
40 
41 /* Check the Boot Mode. If Secure, return 1 else return 0 */
42 int fsl_check_boot_mode_secure(void)
43 {
44 	uint32_t val;
45 	struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
46 	struct ccsr_gur __iomem *gur = (void *)(CONFIG_DCFG_ADDR);
47 
48 	val = sfp_in32(&sfp_regs->ospr) & ITS_MASK;
49 	if (val == ITS_MASK)
50 		return 1;
51 
52 #if defined(CONFIG_FSL_CORENET) || !defined(CONFIG_MPC85xx)
53 	/* For PBL based platforms check the SB_EN bit in RCWSR */
54 	val = gur_in32(&gur->rcwsr[RCW_SB_EN_REG_INDEX - 1]) & RCW_SB_EN_MASK;
55 	if (val == RCW_SB_EN_MASK)
56 		return 1;
57 #endif
58 
59 #if defined(CONFIG_MPC85xx) && !defined(CONFIG_FSL_CORENET)
60 	/* For Non-PBL Platforms, check the Device Status register 2*/
61 	val = gur_in32(&gur->pordevsr2) & MPC85xx_PORDEVSR2_SBC_MASK;
62 	if (val != MPC85xx_PORDEVSR2_SBC_MASK)
63 		return 1;
64 
65 #endif
66 	return 0;
67 }
68 
69 #ifndef CONFIG_SPL_BUILD
70 int fsl_setenv_chain_of_trust(void)
71 {
72 	/* Check Boot Mode
73 	 * If Boot Mode is Non-Secure, no changes are required
74 	 */
75 	if (fsl_check_boot_mode_secure() == 0)
76 		return 0;
77 
78 	/* If Boot mode is Secure, set the environment variables
79 	 * bootdelay = 0 (To disable Boot Prompt)
80 	 * bootcmd = CONFIG_CHAIN_BOOT_CMD (Validate and execute Boot script)
81 	 */
82 	setenv("bootdelay", "0");
83 	setenv("bootcmd", CONFIG_CHAIN_BOOT_CMD);
84 	return 0;
85 }
86 #endif
87 
88 #ifdef CONFIG_SPL_BUILD
89 void spl_validate_uboot(uint32_t hdr_addr, uintptr_t img_addr)
90 {
91 	int res;
92 
93 	/*
94 	 * Check Boot Mode
95 	 * If Boot Mode is Non-Secure, skip validation
96 	 */
97 	if (fsl_check_boot_mode_secure() == 0)
98 		return;
99 
100 	printf("SPL: Validating U-Boot image\n");
101 
102 #ifdef CONFIG_ADDR_MAP
103 	init_addr_map();
104 #endif
105 
106 #ifdef CONFIG_FSL_CORENET
107 	if (pamu_init() < 0)
108 		fsl_secboot_handle_error(ERROR_ESBC_PAMU_INIT);
109 #endif
110 
111 #ifdef CONFIG_FSL_CAAM
112 	if (sec_init() < 0)
113 		fsl_secboot_handle_error(ERROR_ESBC_SEC_INIT);
114 #endif
115 
116 /*
117  * dm_init_and_scan() is called as part of common SPL framework, so no
118  * need to call it again but in case of powerpc platforms which currently
119  * do not use common SPL framework, so need to call this function here.
120  */
121 #if defined(CONFIG_SPL_DM) && (!defined(CONFIG_SPL_FRAMEWORK))
122 	dm_init_and_scan(true);
123 #endif
124 	res = fsl_secboot_validate(hdr_addr, CONFIG_SPL_UBOOT_KEY_HASH,
125 				   &img_addr);
126 
127 	if (res == 0)
128 		printf("SPL: Validation of U-boot successful\n");
129 }
130 
131 #ifdef CONFIG_SPL_FRAMEWORK
132 /* Override weak funtion defined in SPL framework to enable validation
133  * of main u-boot image before jumping to u-boot image.
134  */
135 void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
136 {
137 	typedef void __noreturn (*image_entry_noargs_t)(void);
138 	uint32_t hdr_addr;
139 
140 	image_entry_noargs_t image_entry =
141 		(image_entry_noargs_t)(unsigned long)spl_image->entry_point;
142 
143 	hdr_addr = (spl_image->entry_point + spl_image->size -
144 			CONFIG_U_BOOT_HDR_SIZE);
145 	spl_validate_uboot(hdr_addr, (uintptr_t)spl_image->entry_point);
146 	/*
147 	 * In case of failure in validation, spl_validate_uboot would
148 	 * not return back in case of Production environment with ITS=1.
149 	 * Thus U-Boot will not start.
150 	 * In Development environment (ITS=0 and SB_EN=1), the function
151 	 * may return back in case of non-fatal failures.
152 	 */
153 
154 	debug("image entry point: 0x%lX\n", spl_image->entry_point);
155 	image_entry();
156 }
157 #endif /* ifdef CONFIG_SPL_FRAMEWORK */
158 #endif /* ifdef CONFIG_SPL_BUILD */
159