--- /dev/null
+/*
+ * Generic driver for NXP NCI NFC chips
+ *
+ * Copyright (C) 2014 NXP Semiconductors All rights reserved.
+ *
+ * Author: Clément Perrochaud <clement.perrochaud@nxp.com>
+ *
+ * Derived from PN544 device driver:
+ * Copyright (C) 2012 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/completion.h>
+#include <linux/firmware.h>
+#include <linux/nfc.h>
+#include <linux/unaligned/access_ok.h>
+
+#include "nxp-nci.h"
+
+/* Crypto operations can take up to 30 seconds */
+#define NXP_NCI_FW_ANSWER_TIMEOUT msecs_to_jiffies(30000)
+
+#define NXP_NCI_FW_CMD_RESET 0xF0
+#define NXP_NCI_FW_CMD_GETVERSION 0xF1
+#define NXP_NCI_FW_CMD_CHECKINTEGRITY 0xE0
+#define NXP_NCI_FW_CMD_WRITE 0xC0
+#define NXP_NCI_FW_CMD_READ 0xA2
+#define NXP_NCI_FW_CMD_GETSESSIONSTATE 0xF2
+#define NXP_NCI_FW_CMD_LOG 0xA7
+#define NXP_NCI_FW_CMD_FORCE 0xD0
+#define NXP_NCI_FW_CMD_GET_DIE_ID 0xF4
+
+#define NXP_NCI_FW_CHUNK_FLAG 0x0400
+
+#define NXP_NCI_FW_RESULT_OK 0x00
+#define NXP_NCI_FW_RESULT_INVALID_ADDR 0x01
+#define NXP_NCI_FW_RESULT_GENERIC_ERROR 0x02
+#define NXP_NCI_FW_RESULT_UNKNOWN_CMD 0x0B
+#define NXP_NCI_FW_RESULT_ABORTED_CMD 0x0C
+#define NXP_NCI_FW_RESULT_PLL_ERROR 0x0D
+#define NXP_NCI_FW_RESULT_ADDR_RANGE_OFL_ERROR 0x1E
+#define NXP_NCI_FW_RESULT_BUFFER_OFL_ERROR 0x1F
+#define NXP_NCI_FW_RESULT_MEM_BSY 0x20
+#define NXP_NCI_FW_RESULT_SIGNATURE_ERROR 0x21
+#define NXP_NCI_FW_RESULT_FIRMWARE_VERSION_ERROR 0x24
+#define NXP_NCI_FW_RESULT_PROTOCOL_ERROR 0x28
+#define NXP_NCI_FW_RESULT_SFWU_DEGRADED 0x2A
+#define NXP_NCI_FW_RESULT_PH_STATUS_FIRST_CHUNK 0x2D
+#define NXP_NCI_FW_RESULT_PH_STATUS_NEXT_CHUNK 0x2E
+#define NXP_NCI_FW_RESULT_PH_STATUS_INTERNAL_ERROR_5 0xC5
+
+void nxp_nci_fw_work_complete(struct nxp_nci_info *info, int result)
+{
+ struct nxp_nci_fw_info *fw_info = &info->fw_info;
+ int r;
+
+ if (info->phy_ops->set_mode) {
+ r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
+ if (r < 0 && result == 0)
+ result = -r;
+ }
+
+ info->mode = NXP_NCI_MODE_COLD;
+
+ if (fw_info->fw) {
+ release_firmware(fw_info->fw);
+ fw_info->fw = NULL;
+ }
+
+ nfc_fw_download_done(info->ndev->nfc_dev, fw_info->name, (u32) -result);
+}
+
+/* crc_ccitt cannot be used since it is computed MSB first and not LSB first */
+static u16 nxp_nci_fw_crc(u8 const *buffer, size_t len)
+{
+ u16 crc = 0xffff;
+
+ while (len--) {
+ crc = ((crc >> 8) | (crc << 8)) ^ *buffer++;
+ crc ^= (crc & 0xff) >> 4;
+ crc ^= (crc & 0xff) << 12;
+ crc ^= (crc & 0xff) << 5;
+ }
+
+ return crc;
+}
+
+static int nxp_nci_fw_send_chunk(struct nxp_nci_info *info)
+{
+ struct nxp_nci_fw_info *fw_info = &info->fw_info;
+ u16 header, crc;
+ struct sk_buff *skb;
+ size_t chunk_len;
+ size_t remaining_len;
+ int r;
+
+ skb = nci_skb_alloc(info->ndev, info->max_payload, GFP_KERNEL);
+ if (!skb) {
+ r = -ENOMEM;
+ goto chunk_exit;
+ }
+
+ chunk_len = info->max_payload - NXP_NCI_FW_HDR_LEN - NXP_NCI_FW_CRC_LEN;
+ remaining_len = fw_info->frame_size - fw_info->written;
+
+ if (remaining_len > chunk_len) {
+ header = NXP_NCI_FW_CHUNK_FLAG;
+ } else {
+ chunk_len = remaining_len;
+ header = 0x0000;
+ }
+
+ header |= chunk_len & NXP_NCI_FW_FRAME_LEN_MASK;
+ put_unaligned_be16(header, skb_put(skb, NXP_NCI_FW_HDR_LEN));
+
+ memcpy(skb_put(skb, chunk_len), fw_info->data + fw_info->written,
+ chunk_len);
+
+ crc = nxp_nci_fw_crc(skb->data, chunk_len + NXP_NCI_FW_HDR_LEN);
+ put_unaligned_be16(crc, skb_put(skb, NXP_NCI_FW_CRC_LEN));
+
+ r = info->phy_ops->write(info->phy_id, skb);
+ if (r >= 0)
+ r = chunk_len;
+
+ kfree_skb(skb);
+
+chunk_exit:
+ return r;
+}
+
+static int nxp_nci_fw_send(struct nxp_nci_info *info)
+{
+ struct nxp_nci_fw_info *fw_info = &info->fw_info;
+ long completion_rc;
+ int r;
+
+ reinit_completion(&fw_info->cmd_completion);
+
+ if (fw_info->written == 0) {
+ fw_info->frame_size = get_unaligned_be16(fw_info->data) &
+ NXP_NCI_FW_FRAME_LEN_MASK;
+ fw_info->data += NXP_NCI_FW_HDR_LEN;
+ fw_info->size -= NXP_NCI_FW_HDR_LEN;
+ }
+
+ if (fw_info->frame_size > fw_info->size)
+ return -EMSGSIZE;
+
+ r = nxp_nci_fw_send_chunk(info);
+ if (r < 0)
+ return r;
+
+ fw_info->written += r;
+
+ if (*fw_info->data == NXP_NCI_FW_CMD_RESET) {
+ fw_info->cmd_result = 0;
+ if (fw_info->fw)
+ schedule_work(&fw_info->work);
+ } else {
+ completion_rc = wait_for_completion_interruptible_timeout(
+ &fw_info->cmd_completion, NXP_NCI_FW_ANSWER_TIMEOUT);
+ if (completion_rc == 0)
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+void nxp_nci_fw_work(struct work_struct *work)
+{
+ struct nxp_nci_info *info;
+ struct nxp_nci_fw_info *fw_info;
+ int r;
+
+ fw_info = container_of(work, struct nxp_nci_fw_info, work);
+ info = container_of(fw_info, struct nxp_nci_info, fw_info);
+
+ mutex_lock(&info->info_lock);
+
+ r = fw_info->cmd_result;
+ if (r < 0)
+ goto exit_work;
+
+ if (fw_info->written == fw_info->frame_size) {
+ fw_info->data += fw_info->frame_size;
+ fw_info->size -= fw_info->frame_size;
+ fw_info->written = 0;
+ }
+
+ if (fw_info->size > 0)
+ r = nxp_nci_fw_send(info);
+
+exit_work:
+ if (r < 0 || fw_info->size == 0)
+ nxp_nci_fw_work_complete(info, r);
+ mutex_unlock(&info->info_lock);
+}
+
+int nxp_nci_fw_download(struct nci_dev *ndev, const char *firmware_name)
+{
+ struct nxp_nci_info *info = nci_get_drvdata(ndev);
+ struct nxp_nci_fw_info *fw_info = &info->fw_info;
+ int r;
+
+ mutex_lock(&info->info_lock);
+
+ if (!info->phy_ops->set_mode || !info->phy_ops->write) {
+ r = -ENOTSUPP;
+ goto fw_download_exit;
+ }
+
+ if (!firmware_name || firmware_name[0] == '\0') {
+ r = -EINVAL;
+ goto fw_download_exit;
+ }
+
+ strcpy(fw_info->name, firmware_name);
+
+ r = request_firmware(&fw_info->fw, firmware_name,
+ ndev->nfc_dev->dev.parent);
+ if (r < 0)
+ goto fw_download_exit;
+
+ r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_FW);
+ if (r < 0) {
+ release_firmware(fw_info->fw);
+ goto fw_download_exit;
+ }
+
+ info->mode = NXP_NCI_MODE_FW;
+
+ fw_info->data = fw_info->fw->data;
+ fw_info->size = fw_info->fw->size;
+ fw_info->written = 0;
+ fw_info->frame_size = 0;
+ fw_info->cmd_result = 0;
+
+ schedule_work(&fw_info->work);
+
+fw_download_exit:
+ mutex_unlock(&info->info_lock);
+ return r;
+}
+
+static int nxp_nci_fw_read_status(u8 stat)
+{
+ switch (stat) {
+ case NXP_NCI_FW_RESULT_OK:
+ return 0;
+ case NXP_NCI_FW_RESULT_INVALID_ADDR:
+ return -EINVAL;
+ case NXP_NCI_FW_RESULT_UNKNOWN_CMD:
+ return -EINVAL;
+ case NXP_NCI_FW_RESULT_ABORTED_CMD:
+ return -EMSGSIZE;
+ case NXP_NCI_FW_RESULT_ADDR_RANGE_OFL_ERROR:
+ return -EADDRNOTAVAIL;
+ case NXP_NCI_FW_RESULT_BUFFER_OFL_ERROR:
+ return -ENOBUFS;
+ case NXP_NCI_FW_RESULT_MEM_BSY:
+ return -ENOKEY;
+ case NXP_NCI_FW_RESULT_SIGNATURE_ERROR:
+ return -EKEYREJECTED;
+ case NXP_NCI_FW_RESULT_FIRMWARE_VERSION_ERROR:
+ return -EALREADY;
+ case NXP_NCI_FW_RESULT_PROTOCOL_ERROR:
+ return -EPROTO;
+ case NXP_NCI_FW_RESULT_SFWU_DEGRADED:
+ return -EHWPOISON;
+ case NXP_NCI_FW_RESULT_PH_STATUS_FIRST_CHUNK:
+ return 0;
+ case NXP_NCI_FW_RESULT_PH_STATUS_NEXT_CHUNK:
+ return 0;
+ case NXP_NCI_FW_RESULT_PH_STATUS_INTERNAL_ERROR_5:
+ return -EINVAL;
+ default:
+ return -EIO;
+ }
+}
+
+static u16 nxp_nci_fw_check_crc(struct sk_buff *skb)
+{
+ u16 crc, frame_crc;
+ size_t len = skb->len - NXP_NCI_FW_CRC_LEN;
+
+ crc = nxp_nci_fw_crc(skb->data, len);
+ frame_crc = get_unaligned_be16(skb->data + len);
+
+ return (crc ^ frame_crc);
+}
+
+void nxp_nci_fw_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
+{
+ struct nxp_nci_info *info = nci_get_drvdata(ndev);
+ struct nxp_nci_fw_info *fw_info = &info->fw_info;
+
+ complete(&fw_info->cmd_completion);
+
+ if (skb) {
+ if (nxp_nci_fw_check_crc(skb) != 0x00)
+ fw_info->cmd_result = -EBADMSG;
+ else
+ fw_info->cmd_result = nxp_nci_fw_read_status(
+ *skb_pull(skb, NXP_NCI_FW_HDR_LEN));
+ kfree_skb(skb);
+ } else {
+ fw_info->cmd_result = -EIO;
+ }
+
+ if (fw_info->fw)
+ schedule_work(&fw_info->work);
+}
+EXPORT_SYMBOL(nxp_nci_fw_recv_frame);
Code Review / kvmfornfv.git / blobdiff