drivers/misc/stm32mp_fuse.c

   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 <fuse.h>
   9 #include <misc.h>
  10 #include <errno.h>
  11 #include <dm/device.h>
  12 #include <dm/uclass.h>
  13 #include <power/stpmic1.h>
  14
  15 #define STM32MP_OTP_BANK        0
  16 #define STM32MP_NVM_BANK        1
  17
  18 /*
  19  * The 'fuse' command API
  20  */
  21 int fuse_read(u32 bank, u32 word, u32 *val)
  22 {
  23         int ret;
  24         struct udevice *dev;
  25
  26         switch (bank) {
  27         case STM32MP_OTP_BANK:
  28                 ret = uclass_get_device_by_driver(UCLASS_MISC,
  29                                                   DM_GET_DRIVER(stm32mp_bsec),
  30                                                   &dev);
  31                 if (ret)
  32                         return ret;
  33                 ret = misc_read(dev, word * 4 + STM32_BSEC_SHADOW_OFFSET,
  34                                 val, 4);
  35                 if (ret != 4)
  36                         ret = -EINVAL;
  37                 else
  38                         ret = 0;
  39                 break;
  40
  41 #ifdef CONFIG_PMIC_STPMIC1
  42         case STM32MP_NVM_BANK:
  43                 ret = uclass_get_device_by_driver(UCLASS_MISC,
  44                                                   DM_GET_DRIVER(stpmic1_nvm),
  45                                                   &dev);
  46                 if (ret)
  47                         return ret;
  48                 *val = 0;
  49                 ret = misc_read(dev, -word, val, 1);
  50                 if (ret != 1)
  51                         ret = -EINVAL;
  52                 else
  53                         ret = 0;
  54                 break;
  55 #endif /* CONFIG_PMIC_STPMIC1 */
  56
  57         default:
  58                 printf("stm32mp %s: wrong value for bank %i\n", __func__, bank);
  59                 ret = -EINVAL;
  60                 break;
  61         }
  62
  63         return ret;
  64 }
  65
  66 int fuse_prog(u32 bank, u32 word, u32 val)
  67 {
  68         struct udevice *dev;
  69         int ret;
  70
  71         switch (bank) {
  72         case STM32MP_OTP_BANK:
  73                 ret = uclass_get_device_by_driver(UCLASS_MISC,
  74                                                   DM_GET_DRIVER(stm32mp_bsec),
  75                                                   &dev);
  76                 if (ret)
  77                         return ret;
  78                 ret = misc_write(dev, word * 4 + STM32_BSEC_OTP_OFFSET,
  79                                  &val, 4);
  80                 if (ret != 4)
  81                         ret = -EINVAL;
  82                 else
  83                         ret = 0;
  84                 break;
  85
  86 #ifdef CONFIG_PMIC_STPMIC1
  87         case STM32MP_NVM_BANK:
  88                 ret = uclass_get_device_by_driver(UCLASS_MISC,
  89                                                   DM_GET_DRIVER(stpmic1_nvm),
  90                                                   &dev);
  91                 if (ret)
  92                         return ret;
  93                 ret = misc_write(dev, word, &val, 1);
  94                 if (ret != 1)
  95                         ret = -EINVAL;
  96                 else
  97                         ret = 0;
  98                 break;
  99 #endif /* CONFIG_PMIC_STPMIC1 */
 100
 101         default:
 102                 printf("stm32mp %s: wrong value for bank %i\n", __func__, bank);
 103                 ret = -EINVAL;
 104                 break;
 105         }
 106
 107         return ret;
 108 }
 109
 110 int fuse_sense(u32 bank, u32 word, u32 *val)
 111 {
 112         struct udevice *dev;
 113         int ret;
 114
 115         switch (bank) {
 116         case STM32MP_OTP_BANK:
 117                 ret = uclass_get_device_by_driver(UCLASS_MISC,
 118                                                   DM_GET_DRIVER(stm32mp_bsec),
 119                                                   &dev);
 120                 if (ret)
 121                         return ret;
 122                 ret = misc_read(dev, word * 4 + STM32_BSEC_OTP_OFFSET, val, 4);
 123                 if (ret != 4)
 124                         ret = -EINVAL;
 125                 else
 126                         ret = 0;
 127                 break;
 128
 129 #ifdef CONFIG_PMIC_STPMIC1
 130         case STM32MP_NVM_BANK:
 131                 ret = uclass_get_device_by_driver(UCLASS_MISC,
 132                                                   DM_GET_DRIVER(stpmic1_nvm),
 133                                                   &dev);
 134                 if (ret)
 135                         return ret;
 136                 *val = 0;
 137                 ret = misc_read(dev, word, val, 1);
 138                 if (ret != 1)
 139                         ret = -EINVAL;
 140                 else
 141                         ret = 0;
 142                 break;
 143 #endif /* CONFIG_PMIC_STPMIC1 */
 144
 145         default:
 146                 printf("stm32mp %s: wrong value for bank %i\n", __func__, bank);
 147                 ret = -EINVAL;
 148                 break;
 149         }
 150
 151         return ret;
 152 }
 153
 154 int fuse_override(u32 bank, u32 word, u32 val)
 155 {
 156         struct udevice *dev;
 157         int ret;
 158
 159         switch (bank) {
 160         case STM32MP_OTP_BANK:
 161                 ret = uclass_get_device_by_driver(UCLASS_MISC,
 162                                                   DM_GET_DRIVER(stm32mp_bsec),
 163                                                   &dev);
 164                 if (ret)
 165                         return ret;
 166                 ret = misc_write(dev, word * 4 + STM32_BSEC_SHADOW_OFFSET,
 167                                  &val, 4);
 168                 if (ret != 4)
 169                         ret = -EINVAL;
 170                 else
 171                         ret = 0;
 172                 break;
 173
 174 #ifdef CONFIG_PMIC_STPMIC1
 175         case STM32MP_NVM_BANK:
 176                 ret = uclass_get_device_by_driver(UCLASS_MISC,
 177                                                   DM_GET_DRIVER(stpmic1_nvm),
 178                                                   &dev);
 179                 if (ret)
 180                         return ret;
 181                 ret = misc_write(dev, -word, &val, 1);
 182                 if (ret != 1)
 183                         ret = -EINVAL;
 184                 else
 185                         ret = 0;
 186                 break;
 187 #endif /* CONFIG_PMIC_STPMIC1 */
 188
 189         default:
 190                 printf("stm32mp %s: wrong value for bank %i\n",
 191                        __func__, bank);
 192                 ret = -EINVAL;
 193                 break;
 194         }
 195
 196         return ret;
 197 }