[PATCH net-next 2/2] net: airoha: npu: Add the capability to read firmware names from dts

[Lorenzo Bianconi]

Introduce the capability to read the firmware binary names from device-tree
using the firmware-name property if available.
This is a preliminary patch to enable NPU offloading for MT7996 (Eagle)
chipset since it requires a different binary with respect to the one
used for MT7992 on the EN7581 SoC.

Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 drivers/net/ethernet/airoha/airoha_npu.c | 42 +++++++++++++++++++++++++++-----
 1 file changed, 36 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/airoha/airoha_npu.c b/drivers/net/ethernet/airoha/airoha_npu.c
index 22f72c146065998d5450477f664ed308b1569aa3..bba30582787babd77083c7456349f0af76afc505 100644
--- a/drivers/net/ethernet/airoha/airoha_npu.c
+++ b/drivers/net/ethernet/airoha/airoha_npu.c
@@ -195,18 +195,18 @@ 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 +218,28 @@ static int airoha_npu_load_firmware(struct device *dev, void __iomem *addr,
 	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 +255,22 @@ 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)

-- 
2.52.0