| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <assert.h> |
| #include <bootstate.h> |
| #include <cbfs.h> |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <ec/google/chromeec/ec.h> |
| #include <fw_config.h> |
| #include <inttypes.h> |
| #include <lib.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <drivers/vpd/vpd.h> |
| |
| uint64_t fw_config_get(void) |
| { |
| static uint64_t fw_config_value; |
| static bool fw_config_value_initialized; |
| |
| /* Nothing to prepare if setup is already done. */ |
| if (fw_config_value_initialized) |
| return fw_config_value; |
| fw_config_value_initialized = true; |
| fw_config_value = UNDEFINED_FW_CONFIG; |
| |
| /* Read the value from EC CBI. */ |
| if (CONFIG(FW_CONFIG_SOURCE_CHROMEEC_CBI)) { |
| if (google_chromeec_cbi_get_fw_config(&fw_config_value)) |
| printk(BIOS_WARNING, "%s: Could not get fw_config from CBI\n", |
| __func__); |
| else |
| printk(BIOS_INFO, "FW_CONFIG value from CBI is 0x%" PRIx64 "\n", |
| fw_config_value); |
| } |
| |
| /* Look in CBFS to allow override of value. */ |
| if (CONFIG(FW_CONFIG_SOURCE_CBFS) && fw_config_value == UNDEFINED_FW_CONFIG) { |
| if (cbfs_load(CONFIG_CBFS_PREFIX "/fw_config", &fw_config_value, |
| sizeof(fw_config_value)) != sizeof(fw_config_value)) |
| printk(BIOS_WARNING, "%s: Could not get fw_config from CBFS\n", |
| __func__); |
| else |
| printk(BIOS_INFO, "FW_CONFIG value from CBFS is 0x%" PRIx64 "\n", |
| fw_config_value); |
| } |
| |
| if (CONFIG(FW_CONFIG_SOURCE_VPD) && fw_config_value == UNDEFINED_FW_CONFIG) { |
| int vpd_value; |
| if (vpd_get_int("fw_config", VPD_RW_THEN_RO, &vpd_value)) { |
| fw_config_value = vpd_value; |
| printk(BIOS_INFO, "FW_CONFIG value from VPD is 0x%" PRIx64 "\n", |
| fw_config_value); |
| } else |
| printk(BIOS_WARNING, "%s: Could not get fw_config from vpd\n", |
| __func__); |
| } |
| |
| return fw_config_value; |
| } |
| |
| bool fw_config_probe(const struct fw_config *match) |
| { |
| /* If fw_config is not provisioned, then there is nothing to match. */ |
| if (!fw_config_is_provisioned()) |
| return false; |
| |
| /* Compare to system value. */ |
| if ((fw_config_get() & match->mask) == match->value) { |
| if (match->field_name && match->option_name) |
| printk(BIOS_INFO, "fw_config match found: %s=%s\n", match->field_name, |
| match->option_name); |
| else |
| printk(BIOS_INFO, "fw_config match found: mask=0x%" PRIx64 " value=0x%" |
| PRIx64 "\n", |
| match->mask, match->value); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool fw_config_is_provisioned(void) |
| { |
| return fw_config_get() != UNDEFINED_FW_CONFIG; |
| } |
| |
| bool fw_config_probe_dev(const struct device *dev, const struct fw_config **matching_probe) |
| { |
| const struct fw_config *probe; |
| |
| if (matching_probe) |
| *matching_probe = NULL; |
| |
| /* If the device does not have a probe list, then probing is not required. */ |
| if (!dev->probe_list) |
| return true; |
| |
| for (probe = dev->probe_list; probe && probe->mask != 0; probe++) { |
| if (!fw_config_probe(probe)) |
| continue; |
| |
| if (matching_probe) |
| *matching_probe = probe; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| #if ENV_RAMSTAGE |
| |
| /* |
| * The maximum number of fw_config fields is limited by the 64-bit mask that is used to |
| * represent them. |
| */ |
| #define MAX_CACHE_ELEMENTS (8 * sizeof(uint64_t)) |
| |
| static const struct fw_config *cached_configs[MAX_CACHE_ELEMENTS]; |
| |
| static size_t probe_index(uint64_t mask) |
| { |
| assert(mask); |
| return __ffs64(mask); |
| } |
| |
| const struct fw_config *fw_config_get_found(uint64_t field_mask) |
| { |
| const struct fw_config *config; |
| config = cached_configs[probe_index(field_mask)]; |
| if (config && config->mask == field_mask) |
| return config; |
| |
| return NULL; |
| } |
| |
| void fw_config_for_each_found(void (*cb)(const struct fw_config *config, void *arg), void *arg) |
| { |
| size_t i; |
| |
| for (i = 0; i < MAX_CACHE_ELEMENTS; ++i) |
| if (cached_configs[i]) |
| cb(cached_configs[i], arg); |
| } |
| |
| static void fw_config_init(void *unused) |
| { |
| struct device *dev; |
| |
| for (dev = all_devices; dev; dev = dev->next) { |
| const struct fw_config *probe; |
| |
| if (!fw_config_probe_dev(dev, &probe)) { |
| printk(BIOS_INFO, "%s disabled by fw_config\n", dev_path(dev)); |
| dev->enabled = 0; |
| continue; |
| } |
| |
| if (probe) |
| cached_configs[probe_index(probe->mask)] = probe; |
| } |
| } |
| BOOT_STATE_INIT_ENTRY(BS_DEV_INIT_CHIPS, BS_ON_ENTRY, fw_config_init, NULL); |
| #endif |