path: root/drivers/bluetooth/btmtksdio.c

// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 MediaTek Inc.

/*
 * Bluetooth support for MediaTek SDIO devices
 *
 * This file is written based on btsdio.c and btmtkuart.c.
 *
 * Author: Sean Wang <sean.wang@mediatek.com>
 *
 */

#include <asm/unaligned.h>
#include <linux/atomic.h>
#include <linux/firmware.h>
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/skbuff.h>

#include <linux/mmc/host.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio_func.h>

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

#include "h4_recv.h"

#define VERSION "0.1"

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

#define MTKBTSDIO_AUTOSUSPEND_DELAY	8000

static bool enable_autosuspend;

struct btmtksdio_data {
	const char *fwname;
};

static const struct btmtksdio_data mt7663_data = {
	.fwname = FIRMWARE_MT7663,
};

static const struct btmtksdio_data mt7668_data = {
	.fwname = FIRMWARE_MT7668,
};

static const struct sdio_device_id btmtksdio_table[] = {
	{SDIO_DEVICE(SDIO_VENDOR_ID_MEDIATEK, SDIO_DEVICE_ID_MEDIATEK_MT7663),
	 .driver_data = (kernel_ulong_t)&mt7663_data },
	{SDIO_DEVICE(SDIO_VENDOR_ID_MEDIATEK, SDIO_DEVICE_ID_MEDIATEK_MT7668),
	 .driver_data = (kernel_ulong_t)&mt7668_data },
	{ }	/* Terminating entry */
};
MODULE_DEVICE_TABLE(sdio, btmtksdio_table);

#define MTK_REG_CHLPCR		0x4	/* W1S */
#define C_INT_EN_SET		BIT(0)
#define C_INT_EN_CLR		BIT(1)
#define C_FW_OWN_REQ_SET	BIT(8)  /* For write */
#define C_COM_DRV_OWN		BIT(8)  /* For read */
#define C_FW_OWN_REQ_CLR	BIT(9)

#define MTK_REG_CSDIOCSR	0x8
#define SDIO_RE_INIT_EN		BIT(0)
#define SDIO_INT_CTL		BIT(2)

#define MTK_REG_CHCR		0xc
#define C_INT_CLR_CTRL		BIT(1)

/* CHISR have the same bits field definition with CHIER */
#define MTK_REG_CHISR		0x10
#define MTK_REG_CHIER		0x14
#define FW_OWN_BACK_INT		BIT(0)
#define RX_DONE_INT		BIT(1)
#define TX_EMPTY		BIT(2)
#define TX_FIFO_OVERFLOW	BIT(8)
#define RX_PKT_LEN		GENMASK(31, 16)

#define MTK_REG_CTDR		0x18

#define MTK_REG_CRDR		0x1c

#define MTK_SDIO_BLOCK_SIZE	256

#define BTMTKSDIO_TX_WAIT_VND_EVT	1

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 mtkbtsdio_hdr {
	__le16	len;
	__le16	reserved;
	u8	bt_type;
} __packed;

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 btmtksdio_dev {
	struct hci_dev *hdev;
	struct sdio_func *func;
	struct device *dev;

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

	struct sk_buff *evt_skb;

	const struct btmtksdio_data *data;
};

static int mtk_hci_wmt_sync(struct hci_dev *hdev,
			    struct btmtk_hci_wmt_params *wmt_params)
{
	struct btmtksdio_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)
		return -EINVAL;

	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(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state);

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

	/* 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 BTMTKSDIO_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->