path: root/drivers/bluetooth/btmtkuart.c

// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 MediaTek Inc.

/*
 * Bluetooth support for MediaTek serial devices
 *
 * Author: Sean Wang <sean.wang@mediatek.com>
 *
 */

#include <asm/unaligned.h>
#include <linux/atomic.h>
#include <linux/clk.h>
#include <linux/firmware.h>
#include <linux/gpio/consumer.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/serdev.h>
#include <linux/skbuff.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#include "h4_recv.h"

#define VERSION "0.2"

#define FIRMWARE_MT7622		"mediatek/mt7622pr2h.bin"
#define FIRMWARE_MT7663		"mediatek/mt7663pr2h.bin"
#define FIRMWARE_MT7668		"mediatek/mt7668pr2h.bin"

#define MTK_STP_TLR_SIZE	2

#define BTMTKUART_TX_STATE_ACTIVE	1
#define BTMTKUART_TX_STATE_WAKEUP	2
#define BTMTKUART_TX_WAIT_VND_EVT	3
#define BTMTKUART_REQUIRED_WAKEUP	4

#define BTMTKUART_FLAG_STANDALONE_HW	 BIT(0)

enum {
	MTK_WMT_PATCH_DWNLD = 0x1,
	MTK_WMT_TEST = 0x2,
	MTK_WMT_WAKEUP = 0x3,
	MTK_WMT_HIF = 0x4,
	MTK_WMT_FUNC_CTRL = 0x6,
	MTK_WMT_RST = 0x7,
	MTK_WMT_SEMAPHORE = 0x17,
};

enum {
	BTMTK_WMT_INVALID,
	BTMTK_WMT_PATCH_UNDONE,
	BTMTK_WMT_PATCH_DONE,
	BTMTK_WMT_ON_UNDONE,
	BTMTK_WMT_ON_DONE,
	BTMTK_WMT_ON_PROGRESS,
};

struct mtk_stp_hdr {
	u8	prefix;
	__be16	dlen;
	u8	cs;
} __packed;

struct btmtkuart_data {
	unsigned int flags;
	const char *fwname;
};

struct mtk_wmt_hdr {
	u8	dir;
	u8	op;
	__le16	dlen;
	u8	flag;
} __packed;

struct mtk_hci_wmt_cmd {
	struct mtk_wmt_hdr hdr;
	u8 data[256];
} __packed;

struct btmtk_hci_wmt_evt {
	struct hci_event_hdr hhdr;
	struct mtk_wmt_hdr whdr;
} __packed;

struct btmtk_hci_wmt_evt_funcc {
	struct btmtk_hci_wmt_evt hwhdr;
	__be16 status;
} __packed;

struct btmtk_tci_sleep {
	u8 mode;
	__le16 duration;
	__le16 host_duration;
	u8 host_wakeup_pin;
	u8 time_compensation;
} __packed;

struct btmtk_hci_wmt_params {
	u8 op;
	u8 flag;
	u16 dlen;
	const void *data;
	u32 *status;
};

struct btmtkuart_dev {
	struct hci_dev *hdev;
	struct serdev_device *serdev;

	struct clk *clk;
	struct clk *osc;
	struct regulator *vcc;
	struct gpio_desc *reset;
	struct gpio_desc *boot;
	struct pinctrl *pinctrl;
	struct pinctrl_state *pins_runtime;
	struct pinctrl_state *pins_boot;
	speed_t	desired_speed;
	speed_t	curr_speed;

	struct work_struct tx_work;
	unsigned long tx_state;
	struct sk_buff_head txq;

	struct sk_buff *rx_skb;
	struct sk_buff *evt_skb;

	u8	stp_pad[6];
	u8	stp_cursor;
	u16	stp_dlen;

	const struct btmtkuart_data *data;
};

#define btmtkuart_is_standalone(bdev)	\
	((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
#define btmtkuart_is_builtin_soc(bdev)	\
	!((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)

static int mtk_hci_wmt_sync(struct hci_dev *hdev,
			    struct btmtk_hci_wmt_params *wmt_params)
{
	struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
	struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc;
	u32 hlen, status = BTMTK_WMT_INVALID;
	struct btmtk_hci_wmt_evt *wmt_evt;
	struct mtk_hci_wmt_cmd wc;
	struct mtk_wmt_hdr *hdr;
	int err;

	hlen = sizeof(*hdr) + wmt_params->dlen;
	if (hlen > 255) {
		err = -EINVAL;
		goto err_free_skb;
	}

	hdr = (struct mtk_wmt_hdr *)&wc;
	hdr->dir = 1;
	hdr->op = wmt_params->op;
	hdr->dlen = cpu_to_le16(wmt_params->dlen + 1);
	hdr->flag = wmt_params->flag;
	memcpy(wc.data, wmt_params->data, wmt_params->dlen);

	set_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);

	err = __hci_cmd_send(hdev, 0xfc6f, hlen, &wc);
	if (err < 0) {
		clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
		goto err_free_skb;
	}

	/* The vendor specific WMT commands are all answered by a vendor
	 * specific event and will not have the Command Status or Command
	 * Complete as with usual HCI command flow control.
	 *
	 * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT
	 * state to be cleared. The driver specific event receive routine
	 * will clear that state and with that indicate completion of the
	 * WMT command.
	 */
	err = wait_on_bit_timeout(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT,
				  TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT);
	if (err == -EINTR) {
		bt_dev_err(hdev, "Execution of wmt command interrupted");
		clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_stat