wifi: ath11k: add firmware-2.bin support

Firmware IE containers can dynamically provide various information
what firmware supports. Also it can embed more than one image so
updating firmware is easy, user just needs to update one file in
/lib/firmware/.

The firmware API 2 or higher will use the IE container format, the
current API 1 will not use the new format but it still is supported
for some time. Firmware API 2 files are named as firmware-2.bin
(which contains both amss.bin and m3.bin images) and API 1 files are
amss.bin and m3.bin.

Currently ath11k PCI driver provides firmware binary (amss.bin) path to
MHI driver, MHI driver reads firmware from filesystem and boots it. Add
provision to read firmware files from ath11k driver and provide the amss.bin
firmware data and size to MHI using a pointer.

Currently enum ath11k_fw_features is empty, the patches adding features will
add the flags.

With AHB devices there's no amss.bin or m3.bin, so no changes in how AHB
firmware files are used. But AHB devices can use future additions to the meta
data, for example in enum ath11k_fw_features.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.9

Co-developed-by: P Praneesh <quic_ppranees@quicinc.com>
Signed-off-by: P Praneesh <quic_ppranees@quicinc.com>
Signed-off-by: Anilkumar Kolli <quic_akolli@quicinc.com>
Co-developed-by: Kalle Valo <quic_kvalo@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230727100430.3603551-4-kvalo@kernel.org

1 files changed, 168 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath11k/fw.c b/drivers/net/wireless/ath/ath11k/fw.c
new file mode 100644
index 000000000000..8f84fba29886
--- /dev/null
+++ b/drivers/net/wireless/ath/ath11k/fw.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: BSD-3-Clause-Clear
+/*
+ * Copyright (c) 2022-2023, Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include "core.h"
+
+#include "debug.h"
+
+static int ath11k_fw_request_firmware_api_n(struct ath11k_base *ab,
+					    const char *name)
+{
+	size_t magic_len, len, ie_len;
+	int ie_id, i, index, bit, ret;
+	struct ath11k_fw_ie *hdr;
+	const u8 *data;
+	__le32 *timestamp;
+
+	ab->fw.fw = ath11k_core_firmware_request(ab, name);
+	if (IS_ERR(ab->fw.fw)) {
+		ret = PTR_ERR(ab->fw.fw);
+		ath11k_dbg(ab, ATH11K_DBG_BOOT, "failed to load %s: %d\n", name, ret);
+		ab->fw.fw = NULL;
+		return ret;
+	}
+
+	data = ab->fw.fw->data;
+	len = ab->fw.fw->size;
+
+	/* magic also includes the null byte, check that as well */
+	magic_len = strlen(ATH11K_FIRMWARE_MAGIC) + 1;
+
+	if (len < magic_len) {
+		ath11k_err(ab, "firmware image too small to contain magic: %zu\n",
+			   len);
+		ret = -EINVAL;
+		goto err;
+	}
+
+	if (memcmp(data, ATH11K_FIRMWARE_MAGIC, magic_len) != 0) {
+		ath11k_err(ab, "Invalid firmware magic\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	/* jump over the padding */
+	magic_len = ALIGN(magic_len, 4);
+
+	/* make sure there's space for padding */
+	if (magic_len > len) {
+		ath11k_err(ab, "No space for padding after magic\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	len -= magic_len;
+	data += magic_len;
+
+	/* loop elements */
+	while (len > sizeof(struct ath11k_fw_ie)) {
+		hdr = (struct ath11k_fw_ie *)data;
+
+		ie_id = le32_to_cpu(hdr->id);
+		ie_len = le32_to_cpu(hdr->len);
+
+		len -= sizeof(*hdr);
+		data += sizeof(*hdr);
+
+		if (len < ie_len) {
+			ath11k_err(ab, "Invalid length for FW IE %d (%zu < %zu)\n",
+				   ie_id, len, ie_len);
+			ret = -EINVAL;
+			goto err;
+		}
+
+		switch (ie_id) {
+		case ATH11K_FW_IE_TIMESTAMP:
+			if (ie_len != sizeof(u32))
+				break;
+
+			timestamp = (__le32 *)data;
+
+			ath11k_dbg(ab, ATH11K_DBG_BOOT, "found fw timestamp %d\n",
+				   le32_to_cpup(timestamp));
+			break;
+		case ATH11K_FW_IE_FEATURES:
+			ath11k_dbg(ab, ATH11K_DBG_BOOT,
+				   "found firmware features ie (%zd B)\n",
+				   ie_len);
+
+			for (i = 0; i < ATH11K_FW_FEATURE_COUNT; i++) {
+				index = i / 8;
+				bit = i % 8;
+
+				if (index == ie_len)
+					break;
+
+				if (data[index] & (1 << bit))
+					__set_bit(i, ab->fw.fw_features);
+			}
+
+			ath11k_dbg_dump(ab, ATH11K_DBG_BOOT, "features", "",
+					ab->fw.fw_features,
+					sizeof(ab->fw.fw_features));
+			break;
+		case ATH11K_FW_IE_AMSS_IMAGE:
+			ath11k_dbg(ab, ATH11K_DBG_BOOT,
+				   "found fw image ie (%zd B)\n",
+				   ie_len);
+
+			ab->fw.amss_data = data;
+			ab->fw.amss_len = ie_len;
+			break;
+		case ATH11K_FW_IE_M3_IMAGE:
+			ath11k_dbg(ab, ATH11K_DBG_BOOT,
+				   "found m3 image ie (%zd B)\n",
+				   ie_len);
+
+			ab->fw.m3_data = data;
+			ab->fw.m3_len = ie_len;
+			break;
+		default:
+			ath11k_warn(ab, "Unknown FW IE: %u\n", ie_id);
+			break;
+		}
+
+		/* jump over the padding */
+		ie_len = ALIGN(ie_len, 4);
+
+		/* make sure there's space for padding */
+		if (ie_len > len)
+			break;
+
+		len -= ie_len;
+		data += ie_len;
+	};
+
+	return 0;
+
+err:
+	release_firmware(ab->fw.fw);
+	ab->fw.fw = NULL;
+	return ret;
+}
+
+int ath11k_fw_pre_init(struct ath11k_base *ab)
+{
+	int ret;
+
+	ret = ath11k_fw_request_firmware_api_n(ab, ATH11K_FW_API2_FILE);
+	if (ret == 0) {
+		ab->fw.api_version = 2;
+		goto out;
+	}
+
+	ab->fw.api_version = 1;
+
+out:
+	ath11k_dbg(ab, ATH11K_DBG_BOOT, "using fw api %d\n",
+		   ab->fw.api_version);
+
+	return 0;
+}
+
+void ath11k_fw_destroy(struct ath11k_base *ab)
+{
+	release_firmware(ab->fw.fw);
+}