src/drivers/spi/boot_device_rw_nommap.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <boot_device.h>
  15 #include <spi_flash.h>
  16 #include <spi-generic.h>
  17 #include <stdint.h>
  18
  19 static struct spi_flash sfg;
  20 static bool sfg_init_done;
  21
  22 static ssize_t spi_readat(const struct region_device *rd, void *b,
  23                                 size_t offset, size_t size)
  24 {
  25         if (spi_flash_read(&sfg, offset, size, b))
  26                 return -1;
  27
  28         return size;
  29 }
  30
  31 static ssize_t spi_writeat(const struct region_device *rd, const void *b,
  32                                 size_t offset, size_t size)
  33 {
  34         if (spi_flash_write(&sfg, offset, size, b))
  35                 return -1;
  36
  37         return size;
  38 }
  39
  40 static ssize_t spi_eraseat(const struct region_device *rd,
  41                                 size_t offset, size_t size)
  42 {
  43         if (spi_flash_erase(&sfg, offset, size))
  44                 return -1;
  45
  46         return size;
  47 }
  48
  49 static const struct region_device_ops spi_ops = {
  50         .readat = spi_readat,
  51         .writeat = spi_writeat,
  52         .eraseat = spi_eraseat,
  53 };
  54
  55 static const struct region_device spi_rw =
  56         REGION_DEV_INIT(&spi_ops, 0, CONFIG_ROM_SIZE);
  57
  58 static void boot_device_rw_init(void)
  59 {
  60         const int bus = CONFIG_BOOT_DEVICE_SPI_FLASH_BUS;
  61         const int cs = 0;
  62
  63         if (sfg_init_done == true)
  64                 return;
  65
  66         /* Ensure any necessary setup is performed by the drivers. */
  67         spi_init();
  68
  69         if (!spi_flash_probe(bus, cs, &sfg))
  70                 sfg_init_done = true;
  71 }
  72
  73 const struct region_device *boot_device_rw(void)
  74 {
  75         /* Probe for the SPI flash device if not already done. */
  76         boot_device_rw_init();
  77
  78         if (sfg_init_done != true)
  79                 return NULL;
  80
  81         return &spi_rw;
  82 }
  83
  84 const struct spi_flash *boot_device_spi_flash(void)
  85 {
  86         boot_device_rw_init();
  87
  88         if (sfg_init_done != true)
  89                 return NULL;
  90
  91         return &sfg;
  92 }
  93
  94 int boot_device_wp_region(const struct region_device *rd,
  95                           const enum bootdev_prot_type type)
  96 {
  97         uint32_t ctrlr_pr;
  98
  99         /* Ensure boot device has been initialized at least once. */
 100         boot_device_init();
 101
 102         const struct spi_flash *boot_dev = boot_device_spi_flash();
 103
 104         if (boot_dev == NULL)
 105                 return -1;
 106
 107         if (type == MEDIA_WP) {
 108                 if (spi_flash_is_write_protected(boot_dev,
 109                                                  region_device_region(rd)) != 1) {
 110                         return spi_flash_set_write_protected(boot_dev,
 111                                                 region_device_region(rd), true,
 112                                                 SPI_WRITE_PROTECTION_REBOOT);
 113                 }
 114
 115                 /* Already write protected */
 116                 return 0;
 117         }
 118
 119         switch (type) {
 120         case CTRLR_WP:
 121                 ctrlr_pr = WRITE_PROTECT;
 122                 break;
 123         case CTRLR_RP:
 124                 ctrlr_pr = READ_PROTECT;
 125                 break;
 126         case CTRLR_RWP:
 127                 ctrlr_pr = READ_WRITE_PROTECT;
 128                 break;
 129         default:
 130                 return -1;
 131         }
 132
 133         return spi_flash_ctrlr_protect_region(boot_dev,
 134                                         region_device_region(rd), ctrlr_pr);
 135 }