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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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.
*/
#include <linux/completion.h>
#include <linux/firmware.h>
#include <linux/nfc.h>
#include <asm/unaligned.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)
return -ENOMEM;
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));
skb_put_data(skb, 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);
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(*(u8 *)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);
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