Bluetooth: hci_uart: Add Marvell support

This patch introduces support for Marvell Bluetooth controller over
UART (8897 for now). In order to send the final firmware at full speed,
a helper firmware is firstly sent. Firmware download is driven by the
controller which sends request firmware packets (including expected
size).

This driver is a global rework of the one proposed by
Amitkumar Karwar <akarwar@marvell.com>.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Loic Poulain 2016-09-19 16:29:27 +02:00 committed by Marcel Holtmann
parent 9e69130c4e
commit 162f812f23
5 changed files with 412 additions and 1 deletions

View File

@ -180,6 +180,17 @@ config BT_HCIUART_AG6XX
Say Y here to compile support for Intel AG6XX protocol.
config BT_HCIUART_MRVL
bool "Marvell protocol support"
depends on BT_HCIUART
select BT_HCIUART_H4
help
Marvell is serial protocol for communication between Bluetooth
device and host. This protocol is required for most Marvell Bluetooth
devices with UART interface.
Say Y here to compile support for HCI MRVL protocol.
config BT_HCIBCM203X
tristate "HCI BCM203x USB driver"
depends on USB

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@ -38,6 +38,7 @@ hci_uart-$(CONFIG_BT_HCIUART_INTEL) += hci_intel.o
hci_uart-$(CONFIG_BT_HCIUART_BCM) += hci_bcm.o
hci_uart-$(CONFIG_BT_HCIUART_QCA) += hci_qca.o
hci_uart-$(CONFIG_BT_HCIUART_AG6XX) += hci_ag6xx.o
hci_uart-$(CONFIG_BT_HCIUART_MRVL) += hci_mrvl.o
hci_uart-objs := $(hci_uart-y)
ccflags-y += -D__CHECK_ENDIAN__

View File

@ -810,6 +810,9 @@ static int __init hci_uart_init(void)
#ifdef CONFIG_BT_HCIUART_AG6XX
ag6xx_init();
#endif
#ifdef CONFIG_BT_HCIUART_MRVL
mrvl_init();
#endif
return 0;
}
@ -845,6 +848,9 @@ static void __exit hci_uart_exit(void)
#ifdef CONFIG_BT_HCIUART_AG6XX
ag6xx_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_MRVL
mrvl_deinit();
#endif
/* Release tty registration of line discipline */
err = tty_unregister_ldisc(N_HCI);

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@ -0,0 +1,387 @@
/*
*
* Bluetooth HCI UART driver for marvell devices
*
* Copyright (C) 2016 Marvell International Ltd.
* Copyright (C) 2016 Intel Corporation
*
* 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
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "hci_uart.h"
#define HCI_FW_REQ_PKT 0xA5
#define HCI_CHIP_VER_PKT 0xAA
#define MRVL_ACK 0x5A
#define MRVL_NAK 0xBF
#define MRVL_RAW_DATA 0x1F
enum {
STATE_CHIP_VER_PENDING,
STATE_FW_REQ_PENDING,
};
struct mrvl_data {
struct sk_buff *rx_skb;
struct sk_buff_head txq;
struct sk_buff_head rawq;
unsigned long flags;
unsigned int tx_len;
u8 id, rev;
};
struct hci_mrvl_pkt {
__le16 lhs;
__le16 rhs;
} __packed;
#define HCI_MRVL_PKT_SIZE 4
static int mrvl_open(struct hci_uart *hu)
{
struct mrvl_data *mrvl;
BT_DBG("hu %p", hu);
mrvl = kzalloc(sizeof(*mrvl), GFP_KERNEL);
if (!mrvl)
return -ENOMEM;
skb_queue_head_init(&mrvl->txq);
skb_queue_head_init(&mrvl->rawq);
set_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);
hu->priv = mrvl;
return 0;
}
static int mrvl_close(struct hci_uart *hu)
{
struct mrvl_data *mrvl = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&mrvl->txq);
skb_queue_purge(&mrvl->rawq);
kfree_skb(mrvl->rx_skb);
kfree(mrvl);
hu->priv = NULL;
return 0;
}
static int mrvl_flush(struct hci_uart *hu)
{
struct mrvl_data *mrvl = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&mrvl->txq);
skb_queue_purge(&mrvl->rawq);
return 0;
}
static struct sk_buff *mrvl_dequeue(struct hci_uart *hu)
{
struct mrvl_data *mrvl = hu->priv;
struct sk_buff *skb;
skb = skb_dequeue(&mrvl->txq);
if (!skb) {
/* Any raw data ? */
skb = skb_dequeue(&mrvl->rawq);
} else {
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
}
return skb;
}
static int mrvl_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
struct mrvl_data *mrvl = hu->priv;
skb_queue_tail(&mrvl->txq, skb);
return 0;
}
static void mrvl_send_ack(struct hci_uart *hu, unsigned char type)
{
struct mrvl_data *mrvl = hu->priv;
struct sk_buff *skb;
/* No H4 payload, only 1 byte header */
skb = bt_skb_alloc(0, GFP_ATOMIC);
if (!skb) {
bt_dev_err(hu->hdev, "Unable to alloc ack/nak packet");
return;
}
hci_skb_pkt_type(skb) = type;
skb_queue_tail(&mrvl->txq, skb);
hci_uart_tx_wakeup(hu);
}
static int mrvl_recv_fw_req(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_mrvl_pkt *pkt = (void *)skb->data;
struct hci_uart *hu = hci_get_drvdata(hdev);
struct mrvl_data *mrvl = hu->priv;
int ret = 0;
if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
bt_dev_err(hdev, "Corrupted mrvl header");
mrvl_send_ack(hu, MRVL_NAK);
ret = -EINVAL;
goto done;
}
mrvl_send_ack(hu, MRVL_ACK);
if (!test_bit(STATE_FW_REQ_PENDING, &mrvl->flags)) {
bt_dev_err(hdev, "Received unexpected firmware request");
ret = -EINVAL;
goto done;
}
mrvl->tx_len = le16_to_cpu(pkt->lhs);
clear_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
smp_mb__after_atomic();
wake_up_bit(&mrvl->flags, STATE_FW_REQ_PENDING);
done:
kfree_skb(skb);
return ret;
}
static int mrvl_recv_chip_ver(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_mrvl_pkt *pkt = (void *)skb->data;
struct hci_uart *hu = hci_get_drvdata(hdev);
struct mrvl_data *mrvl = hu->priv;
u16 version = le16_to_cpu(pkt->lhs);
int ret = 0;
if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
bt_dev_err(hdev, "Corrupted mrvl header");
mrvl_send_ack(hu, MRVL_NAK);
ret = -EINVAL;
goto done;
}
mrvl_send_ack(hu, MRVL_ACK);
if (!test_bit(STATE_CHIP_VER_PENDING, &mrvl->flags)) {
bt_dev_err(hdev, "Received unexpected chip version");
goto done;
}
mrvl->id = version;
mrvl->rev = version >> 8;
bt_dev_info(hdev, "Controller id = %x, rev = %x", mrvl->id, mrvl->rev);
clear_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);
smp_mb__after_atomic();
wake_up_bit(&mrvl->flags, STATE_CHIP_VER_PENDING);
done:
kfree_skb(skb);
return ret;
}
#define HCI_RECV_CHIP_VER \
.type = HCI_CHIP_VER_PKT, \
.hlen = HCI_MRVL_PKT_SIZE, \
.loff = 0, \
.lsize = 0, \
.maxlen = HCI_MRVL_PKT_SIZE
#define HCI_RECV_FW_REQ \
.type = HCI_FW_REQ_PKT, \
.hlen = HCI_MRVL_PKT_SIZE, \
.loff = 0, \
.lsize = 0, \
.maxlen = HCI_MRVL_PKT_SIZE
static const struct h4_recv_pkt mrvl_recv_pkts[] = {
{ H4_RECV_ACL, .recv = hci_recv_frame },
{ H4_RECV_SCO, .recv = hci_recv_frame },
{ H4_RECV_EVENT, .recv = hci_recv_frame },
{ HCI_RECV_FW_REQ, .recv = mrvl_recv_fw_req },
{ HCI_RECV_CHIP_VER, .recv = mrvl_recv_chip_ver },
};
static int mrvl_recv(struct hci_uart *hu, const void *data, int count)
{
struct mrvl_data *mrvl = hu->priv;
if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
return -EUNATCH;
mrvl->rx_skb = h4_recv_buf(hu->hdev, mrvl->rx_skb, data, count,
mrvl_recv_pkts,
ARRAY_SIZE(mrvl_recv_pkts));
if (IS_ERR(mrvl->rx_skb)) {
int err = PTR_ERR(mrvl->rx_skb);
bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
mrvl->rx_skb = NULL;
return err;
}
return count;
}
static int mrvl_load_firmware(struct hci_dev *hdev, const char *name)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
struct mrvl_data *mrvl = hu->priv;
const struct firmware *fw = NULL;
const u8 *fw_ptr, *fw_max;
int err;
err = request_firmware(&fw, name, &hdev->dev);
if (err < 0) {
bt_dev_err(hdev, "Failed to load firmware file %s", name);
return err;
}
fw_ptr = fw->data;
fw_max = fw->data + fw->size;
bt_dev_info(hdev, "Loading %s", name);
set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
while (fw_ptr <= fw_max) {
struct sk_buff *skb;
/* Controller drives the firmware load by sending firmware
* request packets containing the expected fragment size.
*/
err = wait_on_bit_timeout(&mrvl->flags, STATE_FW_REQ_PENDING,
TASK_INTERRUPTIBLE,
msecs_to_jiffies(2000));
if (err == 1) {
bt_dev_err(hdev, "Firmware load interrupted");
err = -EINTR;
break;
} else if (err) {
bt_dev_err(hdev, "Firmware request timeout");
err = -ETIMEDOUT;
break;
}
bt_dev_dbg(hdev, "Firmware request, expecting %d bytes",
mrvl->tx_len);
if (fw_ptr == fw_max) {
/* Controller requests a null size once firmware is
* fully loaded. If controller expects more data, there
* is an issue.
*/
if (!mrvl->tx_len) {
bt_dev_info(hdev, "Firmware loading complete");
} else {
bt_dev_err(hdev, "Firmware loading failure");
err = -EINVAL;
}
break;
}
if (fw_ptr + mrvl->tx_len > fw_max) {
mrvl->tx_len = fw_max - fw_ptr;
bt_dev_dbg(hdev, "Adjusting tx_len to %d",
mrvl->tx_len);
}
skb = bt_skb_alloc(mrvl->tx_len, GFP_KERNEL);
if (!skb) {
bt_dev_err(hdev, "Failed to alloc mem for FW packet");
err = -ENOMEM;
break;
}
bt_cb(skb)->pkt_type = MRVL_RAW_DATA;
memcpy(skb_put(skb, mrvl->tx_len), fw_ptr, mrvl->tx_len);
fw_ptr += mrvl->tx_len;
set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
skb_queue_tail(&mrvl->rawq, skb);
hci_uart_tx_wakeup(hu);
}
release_firmware(fw);
return err;
}
static int mrvl_setup(struct hci_uart *hu)
{
int err;
hci_uart_set_flow_control(hu, true);
err = mrvl_load_firmware(hu->hdev, "mrvl/helper_uart_3000000.bin");
if (err) {
bt_dev_err(hu->hdev, "Unable to download firmware helper");
return -EINVAL;
}
hci_uart_set_baudrate(hu, 3000000);
hci_uart_set_flow_control(hu, false);
err = mrvl_load_firmware(hu->hdev, "mrvl/uart8897_bt.bin");
if (err)
return err;
return 0;
}
static const struct hci_uart_proto mrvl_proto = {
.id = HCI_UART_MRVL,
.name = "Marvell",
.init_speed = 115200,
.open = mrvl_open,
.close = mrvl_close,
.flush = mrvl_flush,
.setup = mrvl_setup,
.recv = mrvl_recv,
.enqueue = mrvl_enqueue,
.dequeue = mrvl_dequeue,
};
int __init mrvl_init(void)
{
return hci_uart_register_proto(&mrvl_proto);
}
int __exit mrvl_deinit(void)
{
return hci_uart_unregister_proto(&mrvl_proto);
}

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@ -35,7 +35,7 @@
#define HCIUARTGETFLAGS _IOR('U', 204, int)
/* UART protocols */
#define HCI_UART_MAX_PROTO 11
#define HCI_UART_MAX_PROTO 12
#define HCI_UART_H4 0
#define HCI_UART_BCSP 1
@ -48,6 +48,7 @@
#define HCI_UART_QCA 8
#define HCI_UART_AG6XX 9
#define HCI_UART_NOKIA 10
#define HCI_UART_MRVL 11
#define HCI_UART_RAW_DEVICE 0
#define HCI_UART_RESET_ON_INIT 1
@ -190,3 +191,8 @@ int qca_deinit(void);
int ag6xx_init(void);
int ag6xx_deinit(void);
#endif
#ifdef CONFIG_BT_HCIUART_MRVL
int mrvl_init(void);
int mrvl_deinit(void);
#endif