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