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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9421ce10ad
In that case, the firmware work will never be scheduled, will never complete and thus the firmware will never be released. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
326 lines
8.1 KiB
C
326 lines
8.1 KiB
C
/*
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* Generic driver for NXP NCI NFC chips
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*
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* Copyright (C) 2014 NXP Semiconductors All rights reserved.
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*
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* Author: Clément Perrochaud <clement.perrochaud@nxp.com>
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*
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* Derived from PN544 device driver:
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* Copyright (C) 2012 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/completion.h>
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#include <linux/firmware.h>
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#include <linux/nfc.h>
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#include <linux/unaligned/access_ok.h>
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#include "nxp-nci.h"
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/* Crypto operations can take up to 30 seconds */
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#define NXP_NCI_FW_ANSWER_TIMEOUT msecs_to_jiffies(30000)
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#define NXP_NCI_FW_CMD_RESET 0xF0
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#define NXP_NCI_FW_CMD_GETVERSION 0xF1
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#define NXP_NCI_FW_CMD_CHECKINTEGRITY 0xE0
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#define NXP_NCI_FW_CMD_WRITE 0xC0
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#define NXP_NCI_FW_CMD_READ 0xA2
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#define NXP_NCI_FW_CMD_GETSESSIONSTATE 0xF2
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#define NXP_NCI_FW_CMD_LOG 0xA7
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#define NXP_NCI_FW_CMD_FORCE 0xD0
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#define NXP_NCI_FW_CMD_GET_DIE_ID 0xF4
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#define NXP_NCI_FW_CHUNK_FLAG 0x0400
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#define NXP_NCI_FW_RESULT_OK 0x00
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#define NXP_NCI_FW_RESULT_INVALID_ADDR 0x01
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#define NXP_NCI_FW_RESULT_GENERIC_ERROR 0x02
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#define NXP_NCI_FW_RESULT_UNKNOWN_CMD 0x0B
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#define NXP_NCI_FW_RESULT_ABORTED_CMD 0x0C
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#define NXP_NCI_FW_RESULT_PLL_ERROR 0x0D
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#define NXP_NCI_FW_RESULT_ADDR_RANGE_OFL_ERROR 0x1E
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#define NXP_NCI_FW_RESULT_BUFFER_OFL_ERROR 0x1F
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#define NXP_NCI_FW_RESULT_MEM_BSY 0x20
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#define NXP_NCI_FW_RESULT_SIGNATURE_ERROR 0x21
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#define NXP_NCI_FW_RESULT_FIRMWARE_VERSION_ERROR 0x24
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#define NXP_NCI_FW_RESULT_PROTOCOL_ERROR 0x28
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#define NXP_NCI_FW_RESULT_SFWU_DEGRADED 0x2A
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#define NXP_NCI_FW_RESULT_PH_STATUS_FIRST_CHUNK 0x2D
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#define NXP_NCI_FW_RESULT_PH_STATUS_NEXT_CHUNK 0x2E
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#define NXP_NCI_FW_RESULT_PH_STATUS_INTERNAL_ERROR_5 0xC5
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void nxp_nci_fw_work_complete(struct nxp_nci_info *info, int result)
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{
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struct nxp_nci_fw_info *fw_info = &info->fw_info;
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int r;
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if (info->phy_ops->set_mode) {
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r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
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if (r < 0 && result == 0)
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result = -r;
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}
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info->mode = NXP_NCI_MODE_COLD;
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if (fw_info->fw) {
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release_firmware(fw_info->fw);
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fw_info->fw = NULL;
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}
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nfc_fw_download_done(info->ndev->nfc_dev, fw_info->name, (u32) -result);
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}
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/* crc_ccitt cannot be used since it is computed MSB first and not LSB first */
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static u16 nxp_nci_fw_crc(u8 const *buffer, size_t len)
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{
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u16 crc = 0xffff;
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while (len--) {
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crc = ((crc >> 8) | (crc << 8)) ^ *buffer++;
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crc ^= (crc & 0xff) >> 4;
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crc ^= (crc & 0xff) << 12;
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crc ^= (crc & 0xff) << 5;
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}
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return crc;
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}
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static int nxp_nci_fw_send_chunk(struct nxp_nci_info *info)
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{
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struct nxp_nci_fw_info *fw_info = &info->fw_info;
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u16 header, crc;
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struct sk_buff *skb;
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size_t chunk_len;
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size_t remaining_len;
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int r;
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skb = nci_skb_alloc(info->ndev, info->max_payload, GFP_KERNEL);
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if (!skb) {
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r = -ENOMEM;
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goto chunk_exit;
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}
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chunk_len = info->max_payload - NXP_NCI_FW_HDR_LEN - NXP_NCI_FW_CRC_LEN;
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remaining_len = fw_info->frame_size - fw_info->written;
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if (remaining_len > chunk_len) {
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header = NXP_NCI_FW_CHUNK_FLAG;
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} else {
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chunk_len = remaining_len;
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header = 0x0000;
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}
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header |= chunk_len & NXP_NCI_FW_FRAME_LEN_MASK;
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put_unaligned_be16(header, skb_put(skb, NXP_NCI_FW_HDR_LEN));
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memcpy(skb_put(skb, chunk_len), fw_info->data + fw_info->written,
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chunk_len);
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crc = nxp_nci_fw_crc(skb->data, chunk_len + NXP_NCI_FW_HDR_LEN);
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put_unaligned_be16(crc, skb_put(skb, NXP_NCI_FW_CRC_LEN));
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r = info->phy_ops->write(info->phy_id, skb);
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if (r >= 0)
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r = chunk_len;
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kfree_skb(skb);
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chunk_exit:
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return r;
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}
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static int nxp_nci_fw_send(struct nxp_nci_info *info)
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{
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struct nxp_nci_fw_info *fw_info = &info->fw_info;
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long completion_rc;
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int r;
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reinit_completion(&fw_info->cmd_completion);
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if (fw_info->written == 0) {
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fw_info->frame_size = get_unaligned_be16(fw_info->data) &
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NXP_NCI_FW_FRAME_LEN_MASK;
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fw_info->data += NXP_NCI_FW_HDR_LEN;
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fw_info->size -= NXP_NCI_FW_HDR_LEN;
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}
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if (fw_info->frame_size > fw_info->size)
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return -EMSGSIZE;
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r = nxp_nci_fw_send_chunk(info);
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if (r < 0)
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return r;
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fw_info->written += r;
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if (*fw_info->data == NXP_NCI_FW_CMD_RESET) {
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fw_info->cmd_result = 0;
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if (fw_info->fw)
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schedule_work(&fw_info->work);
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} else {
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completion_rc = wait_for_completion_interruptible_timeout(
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&fw_info->cmd_completion, NXP_NCI_FW_ANSWER_TIMEOUT);
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if (completion_rc == 0)
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return -ETIMEDOUT;
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}
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return 0;
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}
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void nxp_nci_fw_work(struct work_struct *work)
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{
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struct nxp_nci_info *info;
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struct nxp_nci_fw_info *fw_info;
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int r;
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fw_info = container_of(work, struct nxp_nci_fw_info, work);
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info = container_of(fw_info, struct nxp_nci_info, fw_info);
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mutex_lock(&info->info_lock);
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r = fw_info->cmd_result;
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if (r < 0)
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goto exit_work;
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if (fw_info->written == fw_info->frame_size) {
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fw_info->data += fw_info->frame_size;
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fw_info->size -= fw_info->frame_size;
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fw_info->written = 0;
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}
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if (fw_info->size > 0)
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r = nxp_nci_fw_send(info);
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exit_work:
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if (r < 0 || fw_info->size == 0)
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nxp_nci_fw_work_complete(info, r);
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mutex_unlock(&info->info_lock);
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}
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int nxp_nci_fw_download(struct nci_dev *ndev, const char *firmware_name)
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{
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struct nxp_nci_info *info = nci_get_drvdata(ndev);
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struct nxp_nci_fw_info *fw_info = &info->fw_info;
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int r;
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mutex_lock(&info->info_lock);
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if (!info->phy_ops->set_mode || !info->phy_ops->write) {
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r = -ENOTSUPP;
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goto fw_download_exit;
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}
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if (!firmware_name || firmware_name[0] == '\0') {
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r = -EINVAL;
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goto fw_download_exit;
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}
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strcpy(fw_info->name, firmware_name);
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r = request_firmware(&fw_info->fw, firmware_name,
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ndev->nfc_dev->dev.parent);
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if (r < 0)
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goto fw_download_exit;
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r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_FW);
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if (r < 0) {
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release_firmware(fw_info->fw);
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goto fw_download_exit;
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}
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info->mode = NXP_NCI_MODE_FW;
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fw_info->data = fw_info->fw->data;
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fw_info->size = fw_info->fw->size;
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fw_info->written = 0;
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fw_info->frame_size = 0;
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fw_info->cmd_result = 0;
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schedule_work(&fw_info->work);
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fw_download_exit:
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mutex_unlock(&info->info_lock);
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return r;
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}
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static int nxp_nci_fw_read_status(u8 stat)
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{
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switch (stat) {
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case NXP_NCI_FW_RESULT_OK:
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return 0;
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case NXP_NCI_FW_RESULT_INVALID_ADDR:
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return -EINVAL;
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case NXP_NCI_FW_RESULT_UNKNOWN_CMD:
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return -EINVAL;
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case NXP_NCI_FW_RESULT_ABORTED_CMD:
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return -EMSGSIZE;
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case NXP_NCI_FW_RESULT_ADDR_RANGE_OFL_ERROR:
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return -EADDRNOTAVAIL;
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case NXP_NCI_FW_RESULT_BUFFER_OFL_ERROR:
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return -ENOBUFS;
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case NXP_NCI_FW_RESULT_MEM_BSY:
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return -ENOKEY;
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case NXP_NCI_FW_RESULT_SIGNATURE_ERROR:
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return -EKEYREJECTED;
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case NXP_NCI_FW_RESULT_FIRMWARE_VERSION_ERROR:
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return -EALREADY;
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case NXP_NCI_FW_RESULT_PROTOCOL_ERROR:
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return -EPROTO;
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case NXP_NCI_FW_RESULT_SFWU_DEGRADED:
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return -EHWPOISON;
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case NXP_NCI_FW_RESULT_PH_STATUS_FIRST_CHUNK:
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return 0;
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case NXP_NCI_FW_RESULT_PH_STATUS_NEXT_CHUNK:
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return 0;
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case NXP_NCI_FW_RESULT_PH_STATUS_INTERNAL_ERROR_5:
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return -EINVAL;
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default:
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return -EIO;
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}
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}
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static u16 nxp_nci_fw_check_crc(struct sk_buff *skb)
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{
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u16 crc, frame_crc;
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size_t len = skb->len - NXP_NCI_FW_CRC_LEN;
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crc = nxp_nci_fw_crc(skb->data, len);
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frame_crc = get_unaligned_be16(skb->data + len);
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return (crc ^ frame_crc);
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}
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void nxp_nci_fw_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
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{
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struct nxp_nci_info *info = nci_get_drvdata(ndev);
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struct nxp_nci_fw_info *fw_info = &info->fw_info;
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complete(&fw_info->cmd_completion);
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if (skb) {
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if (nxp_nci_fw_check_crc(skb) != 0x00)
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fw_info->cmd_result = -EBADMSG;
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else
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fw_info->cmd_result = nxp_nci_fw_read_status(
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*skb_pull(skb, NXP_NCI_FW_HDR_LEN));
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kfree_skb(skb);
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} else {
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fw_info->cmd_result = -EIO;
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}
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if (fw_info->fw)
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schedule_work(&fw_info->work);
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}
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EXPORT_SYMBOL(nxp_nci_fw_recv_frame);
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