xref: /openbmc/u-boot/drivers/misc/stm32mp_fuse.c (revision ad7061ed)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
4  */
5 
6 #include <common.h>
7 #include <command.h>
8 #include <misc.h>
9 #include <errno.h>
10 #include <dm/device.h>
11 #include <dm/uclass.h>
12 
13 #define STM32MP_OTP_BANK	0
14 
15 /*
16  * The 'fuse' command API
17  */
18 int fuse_read(u32 bank, u32 word, u32 *val)
19 {
20 	int ret = 0;
21 	struct udevice *dev;
22 
23 	switch (bank) {
24 	case STM32MP_OTP_BANK:
25 		ret = uclass_get_device_by_driver(UCLASS_MISC,
26 						  DM_GET_DRIVER(stm32mp_bsec),
27 						  &dev);
28 		if (ret)
29 			return ret;
30 		ret = misc_read(dev, word * 4 + STM32_BSEC_SHADOW_OFFSET,
31 				val, 4);
32 		break;
33 
34 	default:
35 		printf("stm32mp %s: wrong value for bank %i\n", __func__, bank);
36 		ret = -EINVAL;
37 		break;
38 	}
39 
40 	return ret;
41 }
42 
43 int fuse_prog(u32 bank, u32 word, u32 val)
44 {
45 	struct udevice *dev;
46 	int ret;
47 
48 	switch (bank) {
49 	case STM32MP_OTP_BANK:
50 		ret = uclass_get_device_by_driver(UCLASS_MISC,
51 						  DM_GET_DRIVER(stm32mp_bsec),
52 						  &dev);
53 		if (ret)
54 			return ret;
55 		ret = misc_write(dev, word * 4 + STM32_BSEC_OTP_OFFSET,
56 				 &val, 4);
57 		break;
58 
59 	default:
60 		printf("stm32mp %s: wrong value for bank %i\n", __func__, bank);
61 		ret = -EINVAL;
62 		break;
63 	}
64 
65 	return ret;
66 }
67 
68 int fuse_sense(u32 bank, u32 word, u32 *val)
69 {
70 	struct udevice *dev;
71 	int ret;
72 
73 	switch (bank) {
74 	case STM32MP_OTP_BANK:
75 		ret = uclass_get_device_by_driver(UCLASS_MISC,
76 						  DM_GET_DRIVER(stm32mp_bsec),
77 						  &dev);
78 		if (ret)
79 			return ret;
80 		ret = misc_read(dev, word * 4 + STM32_BSEC_OTP_OFFSET, val, 4);
81 		break;
82 
83 	default:
84 		printf("stm32mp %s: wrong value for bank %i\n", __func__, bank);
85 		ret = -EINVAL;
86 		break;
87 	}
88 
89 	return ret;
90 }
91 
92 int fuse_override(u32 bank, u32 word, u32 val)
93 {
94 	struct udevice *dev;
95 	int ret;
96 
97 	switch (bank) {
98 	case STM32MP_OTP_BANK:
99 		ret = uclass_get_device_by_driver(UCLASS_MISC,
100 						  DM_GET_DRIVER(stm32mp_bsec),
101 						  &dev);
102 		if (ret)
103 			return ret;
104 		ret = misc_write(dev, word * 4 + STM32_BSEC_SHADOW_OFFSET,
105 				 &val, 4);
106 		break;
107 
108 	default:
109 		printf("stm32mp %s: wrong value for bank %i\n",
110 		       __func__, bank);
111 		ret = -EINVAL;
112 		break;
113 	}
114 
115 	return ret;
116 }
117