net: airoha: npu: Add the capability to read firmware names from dts

Introduce the capability to read the firmware binary names from device-tree
using the firmware-name property if available.
This patch is needed because NPU firmware binaries are board specific since
they depend on the MediaTek WiFi chip used on the board (e.g. MT7996 or
MT7992) and the WiFi chip version info is not available in the NPU driver.
This is a preliminary patch to enable MT76 NPU offloading if the Airoha SoC
is equipped with MT7996 (Eagle) WiFi chipset.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260120-airoha-npu-firmware-name-v4-2-88999628b4c1@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 40 insertions, 6 deletions

diff --git a/drivers/net/ethernet/airoha/airoha_npu.c b/drivers/net/ethernet/airoha/airoha_npu.c
index a56b3780bb62..89f22f3f47dc 100644
--- a/drivers/net/ethernet/airoha/airoha_npu.c
+++ b/drivers/net/ethernet/airoha/airoha_npu.c
@@ -16,6 +16,8 @@
 
 #define NPU_EN7581_FIRMWARE_DATA		"airoha/en7581_npu_data.bin"
 #define NPU_EN7581_FIRMWARE_RV32		"airoha/en7581_npu_rv32.bin"
+#define NPU_EN7581_7996_FIRMWARE_DATA		"airoha/en7581_MT7996_npu_data.bin"
+#define NPU_EN7581_7996_FIRMWARE_RV32		"airoha/en7581_MT7996_npu_rv32.bin"
 #define NPU_AN7583_FIRMWARE_DATA		"airoha/an7583_npu_data.bin"
 #define NPU_AN7583_FIRMWARE_RV32		"airoha/an7583_npu_rv32.bin"
 #define NPU_EN7581_FIRMWARE_RV32_MAX_SIZE	0x200000
@@ -195,18 +197,18 @@ static int airoha_npu_send_msg(struct airoha_npu *npu, int func_id,
 }
 
 static int airoha_npu_load_firmware(struct device *dev, void __iomem *addr,
-				    const struct airoha_npu_fw *fw_info)
+				    const char *fw_name, int fw_max_size)
 {
 	const struct firmware *fw;
 	int ret;
 
-	ret = request_firmware(&fw, fw_info->name, dev);
+	ret = request_firmware(&fw, fw_name, dev);
 	if (ret)
 		return ret == -ENOENT ? -EPROBE_DEFER : ret;
 
-	if (fw->size > fw_info->max_size) {
+	if (fw->size > fw_max_size) {
 		dev_err(dev, "%s: fw size too overlimit (%zu)\n",
-			fw_info->name, fw->size);
+			fw_name, fw->size);
 		ret = -E2BIG;
 		goto out;
 	}
@@ -218,6 +220,28 @@ out:
 	return ret;
 }
 
+static int
+airoha_npu_load_firmware_from_dts(struct device *dev, void __iomem *addr,
+				  void __iomem *base)
+{
+	const char *fw_names[2];
+	int ret;
+
+	ret = of_property_read_string_array(dev->of_node, "firmware-name",
+					    fw_names, ARRAY_SIZE(fw_names));
+	if (ret != ARRAY_SIZE(fw_names))
+		return -EINVAL;
+
+	ret = airoha_npu_load_firmware(dev, addr, fw_names[0],
+				       NPU_EN7581_FIRMWARE_RV32_MAX_SIZE);
+	if (ret)
+		return ret;
+
+	return airoha_npu_load_firmware(dev, base + REG_NPU_LOCAL_SRAM,
+					fw_names[1],
+					NPU_EN7581_FIRMWARE_DATA_MAX_SIZE);
+}
+
 static int airoha_npu_run_firmware(struct device *dev, void __iomem *base,
 				   struct resource *res)
 {
@@ -233,14 +257,22 @@ static int airoha_npu_run_firmware(struct device *dev, void __iomem *base,
 	if (IS_ERR(addr))
 		return PTR_ERR(addr);
 
+	/* Try to load firmware images using the firmware names provided via
+	 * dts if available.
+	 */
+	if (of_find_property(dev->of_node, "firmware-name", NULL))
+		return airoha_npu_load_firmware_from_dts(dev, addr, base);
+
 	/* Load rv32 npu firmware */
-	ret = airoha_npu_load_firmware(dev, addr, &soc->fw_rv32);
+	ret = airoha_npu_load_firmware(dev, addr, soc->fw_rv32.name,
+				       soc->fw_rv32.max_size);
 	if (ret)
 		return ret;
 
 	/* Load data npu firmware */
 	return airoha_npu_load_firmware(dev, base + REG_NPU_LOCAL_SRAM,
-					&soc->fw_data);
+					soc->fw_data.name,
+					soc->fw_data.max_size);
 }
 
 static irqreturn_t airoha_npu_mbox_handler(int irq, void *npu_instance)
@@ -790,6 +822,8 @@ module_platform_driver(airoha_npu_driver);
 
 MODULE_FIRMWARE(NPU_EN7581_FIRMWARE_DATA);
 MODULE_FIRMWARE(NPU_EN7581_FIRMWARE_RV32);
+MODULE_FIRMWARE(NPU_EN7581_7996_FIRMWARE_DATA);
+MODULE_FIRMWARE(NPU_EN7581_7996_FIRMWARE_RV32);
 MODULE_FIRMWARE(NPU_AN7583_FIRMWARE_DATA);
 MODULE_FIRMWARE(NPU_AN7583_FIRMWARE_RV32);
 MODULE_LICENSE("GPL");