Return-Path: From: Amitkumar Karwar To: CC: , Ganapathi Bhat , Amitkumar Karwar Subject: [PATCH v11 3/3] Bluetooth: hci_uart: Support firmware download for Marvell Date: Fri, 6 May 2016 08:31:54 -0700 Message-ID: <1462548714-7971-3-git-send-email-akarwar@marvell.com> In-Reply-To: <1462548714-7971-1-git-send-email-akarwar@marvell.com> References: <1462548714-7971-1-git-send-email-akarwar@marvell.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: From: Ganapathi Bhat This patch implement firmware download feature for Marvell Bluetooth devices. If firmware is already downloaded, it will skip downloading. Signed-off-by: Ganapathi Bhat Signed-off-by: Amitkumar Karwar --- v2: Fixed compilation warning reported by kbuild test robot v3: Addressed review comments from Marcel Holtmann a) Removed vendor specific code from hci_ldisc.c b) Get rid of static forward declaration c) Removed unnecessary heavy nesting d) Git rid of module parameter and global variables e) Add logic to pick right firmware image v4: Addresses review comments from Alan a) Use existing kernel helper APIs instead of writing own. b) Replace mdelay() with msleep() v5: Addresses review comments from Loic Poulain a) Use bt_dev_err/warn/dbg helpers insted of BT_ERR/WARN/DBG b) Used static functions where required and removed forward delcarations c) Edited comments for the function hci_uart_recv_data d) Made HCI_UART_DNLD_FW flag a part of driver private data v6: Addresses review comments from Loic Poulain a) Used skb instead of array to store firmware data during download b) Used hci_uart_tx_wakeup and enqueued packets instead of tty write c) Used GFP_KERNEL instead of GFP_ATOMIC v7: Edited Kconfig to add dependency for BT_HCIUART_H4. The change resolves errors reported by kbuild test robot. v8: Addressed review comments from Marcel Holtmann a) Removed unnecessary memory allocation failure messages b) Get rid of btmrvl.h header file and add definitions in hci_mrvl.c file v9: Addressed review comments from Marcel Holtmann a) Moved firmware download code from setup to prepare handler. b) Change messages from bt_dev_*->BT_*, as hdev isn't available during firmware download. v10: Addressed review comments from Marcel Holtmann a) Added new callback recv_for_prepare to receive data from device during prepare phase b) Avoided using private flags (HCI_UART_DNLD_FW) as new receive callback is added for the same purpose c) Used kernel API to handle unaligned data d) Moved mrvl_set_baud functionality inside setup callback v11: Write data through ldisc in mrvl_send_ack() instead of directly calling write method(One Thousand Gnomes). --- drivers/bluetooth/Kconfig | 11 + drivers/bluetooth/Makefile | 1 + drivers/bluetooth/hci_ldisc.c | 6 + drivers/bluetooth/hci_mrvl.c | 543 ++++++++++++++++++++++++++++++++++++++++++ drivers/bluetooth/hci_uart.h | 8 +- 5 files changed, 568 insertions(+), 1 deletion(-) create mode 100644 drivers/bluetooth/hci_mrvl.c diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig index cf50fd2..daafd0c 100644 --- a/drivers/bluetooth/Kconfig +++ b/drivers/bluetooth/Kconfig @@ -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 diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile index 9c18939..364dbb6 100644 --- a/drivers/bluetooth/Makefile +++ b/drivers/bluetooth/Makefile @@ -37,6 +37,7 @@ 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__ diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c index 047e786..4896b6f 100644 --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -821,6 +821,9 @@ 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; } @@ -856,6 +859,9 @@ 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); diff --git a/drivers/bluetooth/hci_mrvl.c b/drivers/bluetooth/hci_mrvl.c new file mode 100644 index 0000000..2686901 --- /dev/null +++ b/drivers/bluetooth/hci_mrvl.c @@ -0,0 +1,543 @@ +/* Bluetooth HCI UART driver for Marvell devices + * + * Copyright (C) 2016, Marvell International Ltd. + * + * Acknowledgements: + * This file is based on hci_h4.c, which was written + * by Maxim Krasnyansky and Marcel Holtmann. + * + * This software file (the "File") is distributed by Marvell International + * Ltd. under the terms of the GNU General Public License Version 2, June 1991 + * (the "License"). You may use, redistribute and/or modify this File in + * accordance with the terms and conditions of the License, a copy of which + * is available on the worldwide web at + * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. + * + * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE + * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE + * ARE EXPRESSLY DISCLAIMED. The License provides additional details about + * this warranty disclaimer. + */ + +#include +#include +#include +#include +#include +#include "hci_uart.h" + +struct fw_data { + wait_queue_head_t init_wait_q; + u8 wait_fw; + int next_len; + u8 five_bytes[5]; + u8 next_index; + u8 last_ack; + u8 expected_ack; + struct ktermios old_termios; + u8 chip_id; + u8 chip_rev; + struct sk_buff *skb; +}; + +#define MRVL_HELPER_NAME "mrvl/helper_uart_3000000.bin" +#define MRVL_8997_CHIP_ID 0x50 +#define MRVL_8997_FW_NAME "mrvl/uart8997_bt.bin" +#define MRVL_MAX_FW_BLOCK_SIZE 1024 +#define MRVL_MAX_RETRY_SEND 12 +#define MRVL_DNLD_DELAY 100 +#define MRVL_ACK 0x5A +#define MRVL_NAK 0xBF +#define MRVL_HDR_REQ_FW 0xA5 +#define MRVL_HDR_CHIP_VER 0xAA +#define MRVL_HCI_OP_SET_BAUD 0xFC09 +#define MRVL_FW_HDR_LEN 5 +#define MRVL_WAIT_TIMEOUT msecs_to_jiffies(12000) + +struct mrvl_data { + struct sk_buff *rx_skb; + struct sk_buff_head txq; + struct fw_data *fwdata; +}; + +static int get_cts(struct hci_uart *hu) +{ + struct tty_struct *tty = hu->tty; + u32 state = tty->ops->tiocmget(tty); + + if (state & TIOCM_CTS) { + bt_dev_dbg(hu->hdev, "CTS is low"); + return 1; + } + bt_dev_dbg(hu->hdev, "CTS is high"); + + return 0; +} + +/* Initialize protocol */ +static int mrvl_open(struct hci_uart *hu) +{ + struct mrvl_data *mrvl; + + bt_dev_dbg(hu->hdev, "hu %p", hu); + + mrvl = kzalloc(sizeof(*mrvl), GFP_KERNEL); + if (!mrvl) + return -ENOMEM; + + skb_queue_head_init(&mrvl->txq); + hu->priv = mrvl; + + return 0; +} + +/* Flush protocol data */ +static int mrvl_flush(struct hci_uart *hu) +{ + struct mrvl_data *mrvl = hu->priv; + + bt_dev_dbg(hu->hdev, "hu %p", hu); + + skb_queue_purge(&mrvl->txq); + + return 0; +} + +/* Close protocol */ +static int mrvl_close(struct hci_uart *hu) +{ + struct mrvl_data *mrvl = hu->priv; + + bt_dev_dbg(hu->hdev, "hu %p", hu); + + skb_queue_purge(&mrvl->txq); + kfree_skb(mrvl->rx_skb); + hu->priv = NULL; + kfree(mrvl); + + return 0; +} + +/* Enqueue frame for transmittion (padding, crc, etc) */ +static int mrvl_enqueue(struct hci_uart *hu, struct sk_buff *skb) +{ + struct mrvl_data *mrvl = hu->priv; + + bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb); + + /* Prepend skb with frame type */ + memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); + skb_queue_tail(&mrvl->txq, skb); + + return 0; +} + +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 }, +}; + +/* Send ACK/NAK to the device */ +static void mrvl_send_ack(struct hci_uart *hu, unsigned char ack) +{ + struct mrvl_data *mrvl = hu->priv; + struct sk_buff *skb; + + skb = bt_skb_alloc(sizeof(ack), GFP_KERNEL); + if (!skb) + return; + + memcpy(skb->data, &ack, sizeof(ack)); + skb_put(skb, sizeof(ack)); + skb_queue_head(&mrvl->txq, skb); + hci_uart_tx_wakeup(hu); +} + +/* Validate the feedback data from device */ +static void mrvl_pkt_complete(struct hci_uart *hu, struct sk_buff *skb) +{ + struct mrvl_data *mrvl = hu->priv; + struct fw_data *fw_data = mrvl->fwdata; + u16 lhs, rhs; + + lhs = get_unaligned_le16(skb->data + 1); + rhs = get_unaligned_le16(skb->data + 3); + if ((lhs ^ rhs) == 0xffff) { + mrvl_send_ack(hu, MRVL_ACK); + fw_data->wait_fw = 1; + fw_data->next_len = lhs; + /* Firmware download is done, send the last ack */ + if (!lhs) + fw_data->last_ack = 1; + + if (fw_data->expected_ack == MRVL_HDR_CHIP_VER) { + fw_data->chip_id = skb->data[1]; + fw_data->chip_rev = skb->data[2]; + } + wake_up_interruptible(&fw_data->init_wait_q); + } else { + mrvl_send_ack(hu, MRVL_NAK); + } +} + +/* This function receives data from the uart device during firmware download. + * Driver expects 5 bytes of data as per the protocal in the below format: + *
+ * BYTE_3 and BYTE_4 are compliment of BYTE_1 an BYTE_2. Data can come in chunks + * of any length. If length received is < 5, accumulate the data in an array, + * until we have a sequence of 5 bytes, starting with the expected HEADER. If + * the length received is > 5 bytes, then get the first 5 bytes, starting with + * the HEADER and process the same, ignoring the rest of the bytes as per the + * protocal. + */ +static struct sk_buff *mrvl_process_fw_data(struct hci_uart *hu, + struct sk_buff *skb, + u8 *buf, int count) +{ + struct mrvl_data *mrvl = hu->priv; + struct fw_data *fw_data = mrvl->fwdata; + int i = 0, len; + + if (!skb) { + while (buf[i] != fw_data->expected_ack && i < count) + i++; + if (i == count) + return ERR_PTR(-EILSEQ); + + skb = bt_skb_alloc(MRVL_FW_HDR_LEN, GFP_KERNEL); + } + + if (!skb) + return ERR_PTR(-ENOMEM); + + len = count - i; + memcpy(skb_put(skb, len), &buf[i], len); + + if (skb->len == MRVL_FW_HDR_LEN) { + mrvl_pkt_complete(hu, skb); + kfree_skb(skb); + skb = NULL; + } + + return skb; +} + +/* Receive firmware feedback data */ +static int mrvl_recv_for_prepare(struct hci_uart *hu, const void *data, + int count) +{ + struct mrvl_data *mrvl = hu->priv; + + mrvl->fwdata->skb = mrvl_process_fw_data(hu, mrvl->fwdata->skb, + (u8 *)data, count); + if (IS_ERR(mrvl->fwdata->skb)) { + int err = PTR_ERR(mrvl->fwdata->skb); + + bt_dev_err(hu->hdev, + "Receive firmware data failed (%d)", err); + mrvl->fwdata->skb = NULL; + return err; + } + + return 0; +} + +/* Receive data */ +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 struct sk_buff *mrvl_dequeue(struct hci_uart *hu) +{ + struct mrvl_data *mrvl = hu->priv; + + return skb_dequeue(&mrvl->txq); +} + +static int mrvl_init_fw_data(struct hci_uart *hu) +{ + struct fw_data *fwdata; + struct mrvl_data *mrvl = hu->priv; + + fwdata = kzalloc(sizeof(*fwdata), GFP_KERNEL); + if (!fwdata) + return -ENOMEM; + + mrvl->fwdata = fwdata; + init_waitqueue_head(&fwdata->init_wait_q); + + return 0; +} + +/* Wait for the header from device */ +static int mrvl_wait_for_hdr(struct hci_uart *hu, u8 header) +{ + struct mrvl_data *mrvl = hu->priv; + struct fw_data *fw_data = mrvl->fwdata; + + fw_data->expected_ack = header; + fw_data->wait_fw = 0; + + if (!wait_event_interruptible_timeout(fw_data->init_wait_q, + fw_data->wait_fw, + MRVL_WAIT_TIMEOUT)) { + BT_ERR("TIMEOUT, waiting for:0x%x", fw_data->expected_ack); + return -1; + } + + return 0; +} + +/* Send bytes to device */ +static int mrvl_send_data(struct hci_uart *hu, struct sk_buff *skb) +{ + struct mrvl_data *mrvl = hu->priv; + + skb_queue_head(&mrvl->txq, skb); + hci_uart_tx_wakeup(hu); + + if (mrvl_wait_for_hdr(hu, MRVL_HDR_REQ_FW) == -1) + return -1; + + return 0; +} + +/* Download firmware to the device */ +static int mrvl_dnld_fw(struct hci_uart *hu, const char *file_name) +{ + const struct firmware *fw = NULL; + struct sk_buff *skb = NULL; + int offset = 0; + int ret, tx_len; + struct mrvl_data *mrvl = hu->priv; + struct fw_data *fw_data = mrvl->fwdata; + + ret = request_firmware(&fw, file_name, hu->tty->dev); + if (ret < 0) { + BT_ERR("request_firmware() failed"); + return -1; + } + + BT_INFO("Downloading FW (%d bytes)", (u16)fw->size); + + fw_data->last_ack = 0; + + while (1) { + if ((offset >= fw->size) || (fw_data->last_ack)) + break; + tx_len = fw_data->next_len; + if ((fw->size - offset) < tx_len) + tx_len = fw->size - offset; + + skb = bt_skb_alloc(MRVL_MAX_FW_BLOCK_SIZE, GFP_KERNEL); + if (!skb) { + ret = -1; + goto done; + } + + memcpy(skb->data, &fw->data[offset], tx_len); + skb_put(skb, tx_len); + if (mrvl_send_data(hu, skb) != 0) { + BT_ERR("Fail to download firmware"); + ret = -1; + goto done; + } + offset += tx_len; + } + + BT_INFO("Downloaded %d byte firmware", offset); +done: + release_firmware(fw); + + return ret; +} + +/* Set the baud rate */ +static int mrvl_set_dev_baud(struct hci_uart *hu) +{ + struct hci_dev *hdev = hu->hdev; + struct sk_buff *skb; + static const u8 baud_param[] = { 0xc0, 0xc6, 0x2d, 0x00 }; + int err; + + skb = __hci_cmd_sync(hdev, MRVL_HCI_OP_SET_BAUD, sizeof(baud_param), + baud_param, HCI_INIT_TIMEOUT); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + bt_dev_err(hu->hdev, "Set device baudrate failed (%d)", err); + return err; + } + kfree_skb(skb); + + return 0; +} + +/* Reset device */ +static int mrvl_reset(struct hci_uart *hu) +{ + struct hci_dev *hdev = hu->hdev; + struct sk_buff *skb; + int err; + + skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + bt_dev_err(hu->hdev, "Reset device failed (%d)", err); + return err; + } + kfree_skb(skb); + + return 0; +} + +static int mrvl_get_fw_name(struct hci_uart *hu, char *fw_name) +{ + struct mrvl_data *mrvl = hu->priv; + struct fw_data *fw_data = mrvl->fwdata; + + if (mrvl_wait_for_hdr(hu, MRVL_HDR_CHIP_VER) != 0) { + BT_ERR("Could not read chip id and revision"); + return -1; + } + + BT_DBG("chip_id=0x%x, chip_rev=0x%x", + fw_data->chip_id, fw_data->chip_rev); + + switch (fw_data->chip_id) { + case MRVL_8997_CHIP_ID: + memcpy(fw_name, MRVL_8997_FW_NAME, sizeof(MRVL_8997_FW_NAME)); + return 0; + default: + BT_ERR("Invalid chip id"); + return -1; + } +} + +/* Download helper and firmare to device */ +static int hci_uart_dnld_fw(struct hci_uart *hu) +{ + struct tty_struct *tty = hu->tty; + struct ktermios new_termios; + struct ktermios old_termios; + char fw_name[128]; + int ret; + + old_termios = tty->termios; + + if (get_cts(hu)) { + BT_INFO("fw is running"); + return 0; + } + + hci_uart_set_baudrate(hu, 115200); + hci_uart_set_flow_control(hu, true); + + ret = mrvl_wait_for_hdr(hu, MRVL_HDR_REQ_FW); + if (ret) + goto fail; + + ret = mrvl_dnld_fw(hu, MRVL_HELPER_NAME); + if (ret) + goto fail; + + msleep(MRVL_DNLD_DELAY); + + hci_uart_set_baudrate(hu, 3000000); + hci_uart_set_flow_control(hu, false); + + ret = mrvl_get_fw_name(hu, fw_name); + if (ret) + goto fail; + + ret = mrvl_wait_for_hdr(hu, MRVL_HDR_REQ_FW); + if (ret) + goto fail; + + ret = mrvl_dnld_fw(hu, fw_name); + if (ret) + goto fail; + + msleep(MRVL_DNLD_DELAY); +fail: + /* restore uart settings */ + new_termios = tty->termios; + tty->termios.c_cflag = old_termios.c_cflag; + tty_set_termios(tty, &new_termios); + + return ret; +} + +static int mrvl_setup(struct hci_uart *hu) +{ + int err; + + hci_uart_set_baudrate(hu, 115200); + hci_uart_set_flow_control(hu, false); + + err = mrvl_reset(hu); + if (!err) { + err = mrvl_set_dev_baud(hu); + if (err) + return -1; + } + + hci_uart_set_baudrate(hu, 3000000); + hci_uart_set_flow_control(hu, false); + msleep(MRVL_DNLD_DELAY); + + return 0; +} + +static int mrvl_prepare(struct hci_uart *hu) +{ + struct mrvl_data *mrvl = hu->priv; + int err; + + err = mrvl_init_fw_data(hu); + if (!err) + err = hci_uart_dnld_fw(hu); + + kfree(mrvl->fwdata); + return err; +} + +static const struct hci_uart_proto mrvlp = { + .id = HCI_UART_MRVL, + .name = "MRVL", + .open = mrvl_open, + .close = mrvl_close, + .recv = mrvl_recv, + .enqueue = mrvl_enqueue, + .dequeue = mrvl_dequeue, + .flush = mrvl_flush, + .setup = mrvl_setup, + .prepare = mrvl_prepare, + .recv_for_prepare = mrvl_recv_for_prepare, +}; + +int __init mrvl_init(void) +{ + return hci_uart_register_proto(&mrvlp); +} + +int __exit mrvl_deinit(void) +{ + return hci_uart_unregister_proto(&mrvlp); +} diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h index 17ba3b4..8c53b50 100644 --- a/drivers/bluetooth/hci_uart.h +++ b/drivers/bluetooth/hci_uart.h @@ -35,7 +35,7 @@ #define HCIUARTGETFLAGS _IOR('U', 204, int) /* UART protocols */ -#define HCI_UART_MAX_PROTO 10 +#define HCI_UART_MAX_PROTO 11 #define HCI_UART_H4 0 #define HCI_UART_BCSP 1 @@ -47,6 +47,7 @@ #define HCI_UART_BCM 7 #define HCI_UART_QCA 8 #define HCI_UART_AG6XX 9 +#define HCI_UART_MRVL 10 #define HCI_UART_RAW_DEVICE 0 #define HCI_UART_RESET_ON_INIT 1 @@ -192,3 +193,8 @@ 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 -- 1.8.1.4