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-rw-r--r--src/lib/fw_config.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/src/lib/fw_config.c b/src/lib/fw_config.c
new file mode 100644
index 0000000000..e97cfdc72a
--- /dev/null
+++ b/src/lib/fw_config.c
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#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 <stdbool.h>
+#include <stdint.h>
+
+/**
+ * fw_config_get() - Provide firmware configuration value.
+ *
+ * Return 32bit firmware configuration value determined for the system.
+ */
+static uint32_t fw_config_get(void)
+{
+ static uint32_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;
+
+ /* Look in CBFS to allow override of value. */
+ if (CONFIG(FW_CONFIG_SOURCE_CBFS)) {
+ if (cbfs_boot_load_file(CONFIG_CBFS_PREFIX "/fw_config",
+ &fw_config_value, sizeof(fw_config_value),
+ CBFS_TYPE_RAW) != sizeof(fw_config_value)) {
+ printk(BIOS_WARNING, "%s: Could not get fw_config from CBFS\n",
+ __func__);
+ fw_config_value = 0;
+ } else {
+ printk(BIOS_INFO, "FW_CONFIG value from CBFS is 0x%08x\n",
+ fw_config_value);
+ return fw_config_value;
+ }
+ }
+
+ /* 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 EC\n", __func__);
+ }
+
+ printk(BIOS_INFO, "FW_CONFIG value is 0x%08x\n", fw_config_value);
+ return fw_config_value;
+}
+
+bool fw_config_probe(const struct fw_config *match)
+{
+ /* 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%08x value=0x%08x\n",
+ match->mask, match->value);
+ return true;
+ }
+
+ return false;
+}
+
+#if ENV_RAMSTAGE
+static void fw_config_init(void *unused)
+{
+ struct device *dev;
+
+ for (dev = all_devices; dev; dev = dev->next) {
+ const struct fw_config *probe;
+ bool match = false;
+
+ if (!dev->probe_list)
+ continue;
+
+ for (probe = dev->probe_list; probe && probe->mask != 0; probe++) {
+ if (fw_config_probe(probe)) {
+ match = true;
+ break;
+ }
+ }
+
+ if (!match) {
+ printk(BIOS_INFO, "%s disabled by fw_config\n", dev_path(dev));
+ dev->enabled = 0;
+ }
+ }
+}
+BOOT_STATE_INIT_ENTRY(BS_DEV_ENUMERATE, BS_ON_ENTRY, fw_config_init, NULL);
+#endif