![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version 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 write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
374 lines
7.9 KiB
C
374 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Bluetooth HCI UART driver for marvell devices
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*
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* Copyright (C) 2016 Marvell International Ltd.
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* Copyright (C) 2016 Intel Corporation
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/firmware.h>
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#include <linux/module.h>
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#include <linux/tty.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include "hci_uart.h"
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#define HCI_FW_REQ_PKT 0xA5
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#define HCI_CHIP_VER_PKT 0xAA
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#define MRVL_ACK 0x5A
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#define MRVL_NAK 0xBF
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#define MRVL_RAW_DATA 0x1F
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enum {
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STATE_CHIP_VER_PENDING,
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STATE_FW_REQ_PENDING,
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};
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struct mrvl_data {
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struct sk_buff *rx_skb;
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struct sk_buff_head txq;
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struct sk_buff_head rawq;
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unsigned long flags;
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unsigned int tx_len;
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u8 id, rev;
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};
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struct hci_mrvl_pkt {
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__le16 lhs;
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__le16 rhs;
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} __packed;
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#define HCI_MRVL_PKT_SIZE 4
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static int mrvl_open(struct hci_uart *hu)
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{
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struct mrvl_data *mrvl;
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BT_DBG("hu %p", hu);
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mrvl = kzalloc(sizeof(*mrvl), GFP_KERNEL);
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if (!mrvl)
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return -ENOMEM;
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skb_queue_head_init(&mrvl->txq);
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skb_queue_head_init(&mrvl->rawq);
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set_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);
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hu->priv = mrvl;
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return 0;
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}
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static int mrvl_close(struct hci_uart *hu)
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{
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struct mrvl_data *mrvl = hu->priv;
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BT_DBG("hu %p", hu);
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skb_queue_purge(&mrvl->txq);
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skb_queue_purge(&mrvl->rawq);
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kfree_skb(mrvl->rx_skb);
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kfree(mrvl);
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hu->priv = NULL;
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return 0;
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}
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static int mrvl_flush(struct hci_uart *hu)
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{
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struct mrvl_data *mrvl = hu->priv;
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BT_DBG("hu %p", hu);
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skb_queue_purge(&mrvl->txq);
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skb_queue_purge(&mrvl->rawq);
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return 0;
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}
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static struct sk_buff *mrvl_dequeue(struct hci_uart *hu)
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{
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struct mrvl_data *mrvl = hu->priv;
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struct sk_buff *skb;
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skb = skb_dequeue(&mrvl->txq);
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if (!skb) {
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/* Any raw data ? */
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skb = skb_dequeue(&mrvl->rawq);
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} else {
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/* Prepend skb with frame type */
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memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
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}
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return skb;
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}
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static int mrvl_enqueue(struct hci_uart *hu, struct sk_buff *skb)
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{
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struct mrvl_data *mrvl = hu->priv;
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skb_queue_tail(&mrvl->txq, skb);
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return 0;
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}
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static void mrvl_send_ack(struct hci_uart *hu, unsigned char type)
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{
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struct mrvl_data *mrvl = hu->priv;
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struct sk_buff *skb;
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/* No H4 payload, only 1 byte header */
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skb = bt_skb_alloc(0, GFP_ATOMIC);
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if (!skb) {
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bt_dev_err(hu->hdev, "Unable to alloc ack/nak packet");
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return;
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}
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hci_skb_pkt_type(skb) = type;
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skb_queue_tail(&mrvl->txq, skb);
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hci_uart_tx_wakeup(hu);
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}
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static int mrvl_recv_fw_req(struct hci_dev *hdev, struct sk_buff *skb)
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{
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struct hci_mrvl_pkt *pkt = (void *)skb->data;
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struct hci_uart *hu = hci_get_drvdata(hdev);
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struct mrvl_data *mrvl = hu->priv;
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int ret = 0;
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if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
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bt_dev_err(hdev, "Corrupted mrvl header");
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mrvl_send_ack(hu, MRVL_NAK);
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ret = -EINVAL;
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goto done;
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}
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mrvl_send_ack(hu, MRVL_ACK);
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if (!test_bit(STATE_FW_REQ_PENDING, &mrvl->flags)) {
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bt_dev_err(hdev, "Received unexpected firmware request");
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ret = -EINVAL;
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goto done;
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}
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mrvl->tx_len = le16_to_cpu(pkt->lhs);
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clear_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
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smp_mb__after_atomic();
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wake_up_bit(&mrvl->flags, STATE_FW_REQ_PENDING);
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done:
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kfree_skb(skb);
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return ret;
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}
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static int mrvl_recv_chip_ver(struct hci_dev *hdev, struct sk_buff *skb)
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{
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struct hci_mrvl_pkt *pkt = (void *)skb->data;
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struct hci_uart *hu = hci_get_drvdata(hdev);
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struct mrvl_data *mrvl = hu->priv;
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u16 version = le16_to_cpu(pkt->lhs);
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int ret = 0;
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if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
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bt_dev_err(hdev, "Corrupted mrvl header");
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mrvl_send_ack(hu, MRVL_NAK);
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ret = -EINVAL;
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goto done;
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}
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mrvl_send_ack(hu, MRVL_ACK);
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if (!test_bit(STATE_CHIP_VER_PENDING, &mrvl->flags)) {
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bt_dev_err(hdev, "Received unexpected chip version");
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goto done;
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}
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mrvl->id = version;
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mrvl->rev = version >> 8;
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bt_dev_info(hdev, "Controller id = %x, rev = %x", mrvl->id, mrvl->rev);
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clear_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);
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smp_mb__after_atomic();
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wake_up_bit(&mrvl->flags, STATE_CHIP_VER_PENDING);
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done:
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kfree_skb(skb);
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return ret;
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}
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#define HCI_RECV_CHIP_VER \
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.type = HCI_CHIP_VER_PKT, \
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.hlen = HCI_MRVL_PKT_SIZE, \
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.loff = 0, \
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.lsize = 0, \
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.maxlen = HCI_MRVL_PKT_SIZE
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#define HCI_RECV_FW_REQ \
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.type = HCI_FW_REQ_PKT, \
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.hlen = HCI_MRVL_PKT_SIZE, \
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.loff = 0, \
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.lsize = 0, \
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.maxlen = HCI_MRVL_PKT_SIZE
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static const struct h4_recv_pkt mrvl_recv_pkts[] = {
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{ H4_RECV_ACL, .recv = hci_recv_frame },
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{ H4_RECV_SCO, .recv = hci_recv_frame },
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{ H4_RECV_EVENT, .recv = hci_recv_frame },
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{ HCI_RECV_FW_REQ, .recv = mrvl_recv_fw_req },
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{ HCI_RECV_CHIP_VER, .recv = mrvl_recv_chip_ver },
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};
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static int mrvl_recv(struct hci_uart *hu, const void *data, int count)
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{
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struct mrvl_data *mrvl = hu->priv;
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if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
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return -EUNATCH;
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mrvl->rx_skb = h4_recv_buf(hu->hdev, mrvl->rx_skb, data, count,
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mrvl_recv_pkts,
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ARRAY_SIZE(mrvl_recv_pkts));
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if (IS_ERR(mrvl->rx_skb)) {
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int err = PTR_ERR(mrvl->rx_skb);
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bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
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mrvl->rx_skb = NULL;
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return err;
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}
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return count;
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}
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static int mrvl_load_firmware(struct hci_dev *hdev, const char *name)
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{
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struct hci_uart *hu = hci_get_drvdata(hdev);
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struct mrvl_data *mrvl = hu->priv;
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const struct firmware *fw = NULL;
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const u8 *fw_ptr, *fw_max;
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int err;
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err = request_firmware(&fw, name, &hdev->dev);
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if (err < 0) {
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bt_dev_err(hdev, "Failed to load firmware file %s", name);
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return err;
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}
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fw_ptr = fw->data;
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fw_max = fw->data + fw->size;
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bt_dev_info(hdev, "Loading %s", name);
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set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
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while (fw_ptr <= fw_max) {
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struct sk_buff *skb;
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/* Controller drives the firmware load by sending firmware
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* request packets containing the expected fragment size.
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*/
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err = wait_on_bit_timeout(&mrvl->flags, STATE_FW_REQ_PENDING,
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TASK_INTERRUPTIBLE,
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msecs_to_jiffies(2000));
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if (err == 1) {
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bt_dev_err(hdev, "Firmware load interrupted");
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err = -EINTR;
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break;
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} else if (err) {
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bt_dev_err(hdev, "Firmware request timeout");
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err = -ETIMEDOUT;
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break;
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}
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bt_dev_dbg(hdev, "Firmware request, expecting %d bytes",
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mrvl->tx_len);
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if (fw_ptr == fw_max) {
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/* Controller requests a null size once firmware is
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* fully loaded. If controller expects more data, there
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* is an issue.
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*/
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if (!mrvl->tx_len) {
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bt_dev_info(hdev, "Firmware loading complete");
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} else {
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bt_dev_err(hdev, "Firmware loading failure");
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err = -EINVAL;
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}
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break;
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}
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if (fw_ptr + mrvl->tx_len > fw_max) {
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mrvl->tx_len = fw_max - fw_ptr;
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bt_dev_dbg(hdev, "Adjusting tx_len to %d",
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mrvl->tx_len);
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}
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skb = bt_skb_alloc(mrvl->tx_len, GFP_KERNEL);
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if (!skb) {
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bt_dev_err(hdev, "Failed to alloc mem for FW packet");
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err = -ENOMEM;
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break;
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}
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bt_cb(skb)->pkt_type = MRVL_RAW_DATA;
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skb_put_data(skb, fw_ptr, mrvl->tx_len);
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fw_ptr += mrvl->tx_len;
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set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
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skb_queue_tail(&mrvl->rawq, skb);
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hci_uart_tx_wakeup(hu);
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}
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release_firmware(fw);
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return err;
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}
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static int mrvl_setup(struct hci_uart *hu)
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{
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int err;
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hci_uart_set_flow_control(hu, true);
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err = mrvl_load_firmware(hu->hdev, "mrvl/helper_uart_3000000.bin");
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if (err) {
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bt_dev_err(hu->hdev, "Unable to download firmware helper");
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return -EINVAL;
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}
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hci_uart_set_baudrate(hu, 3000000);
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hci_uart_set_flow_control(hu, false);
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err = mrvl_load_firmware(hu->hdev, "mrvl/uart8897_bt.bin");
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if (err)
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return err;
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return 0;
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}
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static const struct hci_uart_proto mrvl_proto = {
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.id = HCI_UART_MRVL,
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.name = "Marvell",
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.init_speed = 115200,
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.open = mrvl_open,
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.close = mrvl_close,
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.flush = mrvl_flush,
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.setup = mrvl_setup,
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.recv = mrvl_recv,
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.enqueue = mrvl_enqueue,
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.dequeue = mrvl_dequeue,
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};
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int __init mrvl_init(void)
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{
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return hci_uart_register_proto(&mrvl_proto);
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}
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int __exit mrvl_deinit(void)
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{
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return hci_uart_unregister_proto(&mrvl_proto);
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}
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