@@ -62,6 +62,11 @@ config QCOM_MDT_LOADER
tristate
select QCOM_SCM
+config QCOM_FW_HELPER
+ tristate "NONE FW HELPER"
+ help
+ Helpers to return platform-specific location for the firmware files.
+
config QCOM_OCMEM
tristate "Qualcomm On Chip Memory (OCMEM) driver"
depends on ARCH_QCOM
@@ -6,6 +6,7 @@ obj-$(CONFIG_QCOM_GENI_SE) += qcom-geni-se.o
obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
obj-$(CONFIG_QCOM_MDT_LOADER) += mdt_loader.o
+obj-$(CONFIG_QCOM_FW_HELPER) += qcom_fw_helper.o
obj-$(CONFIG_QCOM_OCMEM) += ocmem.o
obj-$(CONFIG_QCOM_PDR_HELPERS) += pdr_interface.o
obj-$(CONFIG_QCOM_PMIC_GLINK) += pmic_glink.o
new file mode 100644
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Qualcomm Firmware loading data
+ *
+ * Copyright (C) 2024 Linaro Ltd
+ */
+
+#include <linux/cleanup.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/soc/qcom/fw_helper.h>
+
+static DEFINE_MUTEX(qcom_fw_mutex);
+static const char *fw_path;
+
+static const struct of_device_id qcom_fw_paths[] = {
+ /* device-specific entries */
+ { .compatible = "thundercomm,db845c", .data = "qcom/sdm845/Thundercomm/db845c", },
+ { .compatible = "qcom,qrb5165-rb5", .data = "qcom/sm8250/Thundercomm/RB5", },
+ /* SoC default entries */
+ { .compatible = "qcom,apq8016", .data = "qcom/apq8016", },
+ { .compatible = "qcom,apq8096", .data = "qcom/apq8096", },
+ { .compatible = "qcom,sdm845", .data = "qcom/sdm845", },
+ { .compatible = "qcom,sm8250", .data = "qcom/sm8250", },
+ { .compatible = "qcom,sm8350", .data = "qcom/sm8350", },
+ { .compatible = "qcom,sm8450", .data = "qcom/sm8450", },
+ { .compatible = "qcom,sm8550", .data = "qcom/sm8550", },
+ { .compatible = "qcom,sm8650", .data = "qcom/sm8650", },
+ {},
+};
+
+static int qcom_fw_ensure_init(void)
+{
+ const struct of_device_id *match;
+ struct device_node *root;
+
+ if (fw_path)
+ return 0;
+
+ root = of_find_node_by_path("/");
+ if (!root)
+ return -ENODEV;
+
+ match = of_match_node(qcom_fw_paths, root);
+ of_node_put(root);
+ if (!match || !match->data) {
+ pr_notice("Platform not supported by qcom_fw_helper\n");
+ return -ENODEV;
+ }
+
+ fw_path = match->data;
+
+ return 0;
+}
+
+const char *qcom_get_board_fw(const char *firmware)
+{
+ if (strchr(firmware, '/'))
+ return kstrdup(firmware, GFP_KERNEL);
+
+ scoped_guard(mutex, &qcom_fw_mutex) {
+ if (!qcom_fw_ensure_init())
+ return kasprintf(GFP_KERNEL, "%s/%s", fw_path, firmware);
+ }
+
+ return kstrdup(firmware, GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(qcom_get_board_fw);
+
+const char *devm_qcom_get_board_fw(struct device *dev, const char *firmware)
+{
+ if (strchr(firmware, '/'))
+ return devm_kstrdup(dev, firmware, GFP_KERNEL);
+
+ scoped_guard(mutex, &qcom_fw_mutex) {
+ if (!qcom_fw_ensure_init())
+ return devm_kasprintf(dev, GFP_KERNEL, "%s/%s", fw_path, firmware);
+ }
+
+ return devm_kstrdup(dev, firmware, GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(devm_qcom_get_board_fw);
+
+MODULE_DESCRIPTION("Firmware helpers for Qualcomm devices");
+MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __QCOM_FW_HELPER_H__
+#define __QCOM_FW_HELPER_H__
+
+struct device;
+
+const char *qcom_get_board_fw(const char *firmware);
+const char *devm_qcom_get_board_fw(struct device *dev, const char *firmware);
+
+#endif
Qualcomm platforms have different sets of the firmware files, which differ from platform to platform (and from board to board, due to the embedded signatures). Rather than listing all the firmware files, including full paths, in the DT, provide a way to determine firmware path based on the root DT node compatible. Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- drivers/soc/qcom/Kconfig | 5 +++ drivers/soc/qcom/Makefile | 1 + drivers/soc/qcom/qcom_fw_helper.c | 86 ++++++++++++++++++++++++++++++++++++++ include/linux/soc/qcom/fw_helper.h | 10 +++++ 4 files changed, 102 insertions(+)