95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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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 <stdbool.h>
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#include <stdint.h>
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/**
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* fw_config_get() - Provide firmware configuration value.
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*
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* Return 32bit firmware configuration value determined for the system.
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*/
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static uint32_t fw_config_get(void)
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{
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static uint32_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_boot_load_file(CONFIG_CBFS_PREFIX "/fw_config",
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&fw_config_value, sizeof(fw_config_value),
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CBFS_TYPE_RAW) != 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 = 0;
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} else {
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printk(BIOS_INFO, "FW_CONFIG value from CBFS is 0x%08x\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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}
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printk(BIOS_INFO, "FW_CONFIG value is 0x%08x\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%08x value=0x%08x\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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#if ENV_RAMSTAGE
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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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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_ENUMERATE, BS_ON_ENTRY, fw_config_init, NULL);
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#endif
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