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- // 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_state);
- goto err_free_skb;
- }
- if (err) {
- bt_dev_err(hdev, "Execution of wmt command timed out");
- clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
- err = -ETIMEDOUT;
- goto err_free_skb;
- }
- /* Parse and handle the return WMT event */
- wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data;
- if (wmt_evt->whdr.op != hdr->op) {
- bt_dev_err(hdev, "Wrong op received %d expected %d",
- wmt_evt->whdr.op, hdr->op);
- err = -EIO;
- goto err_free_skb;
- }
- switch (wmt_evt->whdr.op) {
- case MTK_WMT_SEMAPHORE:
- if (wmt_evt->whdr.flag == 2)
- status = BTMTK_WMT_PATCH_UNDONE;
- else
- status = BTMTK_WMT_PATCH_DONE;
- break;
- case MTK_WMT_FUNC_CTRL:
- wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt;
- if (be16_to_cpu(wmt_evt_funcc->status) == 0x404)
- status = BTMTK_WMT_ON_DONE;
- else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420)
- status = BTMTK_WMT_ON_PROGRESS;
- else
- status = BTMTK_WMT_ON_UNDONE;
- break;
- }
- if (wmt_params->status)
- *wmt_params->status = status;
- err_free_skb:
- kfree_skb(bdev->evt_skb);
- bdev->evt_skb = NULL;
- return err;
- }
- static int mtk_setup_firmware(struct hci_dev *hdev, const char *fwname)
- {
- struct btmtk_hci_wmt_params wmt_params;
- const struct firmware *fw;
- const u8 *fw_ptr;
- size_t fw_size;
- int err, dlen;
- u8 flag;
- err = request_firmware(&fw, fwname, &hdev->dev);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to load firmware file (%d)", err);
- return err;
- }
- fw_ptr = fw->data;
- fw_size = fw->size;
- /* The size of patch header is 30 bytes, should be skip */
- if (fw_size < 30) {
- err = -EINVAL;
- goto free_fw;
- }
- fw_size -= 30;
- fw_ptr += 30;
- flag = 1;
- wmt_params.op = MTK_WMT_PATCH_DWNLD;
- wmt_params.status = NULL;
- while (fw_size > 0) {
- dlen = min_t(int, 250, fw_size);
- /* Tell device the position in sequence */
- if (fw_size - dlen <= 0)
- flag = 3;
- else if (fw_size < fw->size - 30)
- flag = 2;
- wmt_params.flag = flag;
- wmt_params.dlen = dlen;
- wmt_params.data = fw_ptr;
- err = mtk_hci_wmt_sync(hdev, &wmt_params);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to send wmt patch dwnld (%d)",
- err);
- goto free_fw;
- }
- fw_size -= dlen;
- fw_ptr += dlen;
- }
- wmt_params.op = MTK_WMT_RST;
- wmt_params.flag = 4;
- wmt_params.dlen = 0;
- wmt_params.data = NULL;
- wmt_params.status = NULL;
- /* Activate funciton the firmware providing to */
- err = mtk_hci_wmt_sync(hdev, &wmt_params);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to send wmt rst (%d)", err);
- goto free_fw;
- }
- /* Wait a few moments for firmware activation done */
- usleep_range(10000, 12000);
- free_fw:
- release_firmware(fw);
- return err;
- }
- static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
- {
- struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
- struct hci_event_hdr *hdr = (void *)skb->data;
- int err;
- /* Fix up the vendor event id with 0xff for vendor specific instead
- * of 0xe4 so that event send via monitoring socket can be parsed
- * properly.
- */
- if (hdr->evt == 0xe4)
- hdr->evt = HCI_EV_VENDOR;
- /* When someone waits for the WMT event, the skb is being cloned
- * and being processed the events from there then.
- */
- if (test_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state)) {
- bdev->evt_skb = skb_clone(skb, GFP_KERNEL);
- if (!bdev->evt_skb) {
- err = -ENOMEM;
- goto err_out;
- }
- }
- err = hci_recv_frame(hdev, skb);
- if (err < 0)
- goto err_free_skb;
- if (hdr->evt == HCI_EV_VENDOR) {
- if (test_and_clear_bit(BTMTKUART_TX_WAIT_VND_EVT,
- &bdev->tx_state)) {
- /* Barrier to sync with other CPUs */
- smp_mb__after_atomic();
- wake_up_bit(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT);
- }
- }
- return 0;
- err_free_skb:
- kfree_skb(bdev->evt_skb);
- bdev->evt_skb = NULL;
- err_out:
- return err;
- }
- static const struct h4_recv_pkt mtk_recv_pkts[] = {
- { H4_RECV_ACL, .recv = hci_recv_frame },
- { H4_RECV_SCO, .recv = hci_recv_frame },
- { H4_RECV_EVENT, .recv = btmtkuart_recv_event },
- };
- static void btmtkuart_tx_work(struct work_struct *work)
- {
- struct btmtkuart_dev *bdev = container_of(work, struct btmtkuart_dev,
- tx_work);
- struct serdev_device *serdev = bdev->serdev;
- struct hci_dev *hdev = bdev->hdev;
- while (1) {
- clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
- while (1) {
- struct sk_buff *skb = skb_dequeue(&bdev->txq);
- int len;
- if (!skb)
- break;
- len = serdev_device_write_buf(serdev, skb->data,
- skb->len);
- hdev->stat.byte_tx += len;
- skb_pull(skb, len);
- if (skb->len > 0) {
- skb_queue_head(&bdev->txq, skb);
- break;
- }
- switch (hci_skb_pkt_type(skb)) {
- case HCI_COMMAND_PKT:
- hdev->stat.cmd_tx++;
- break;
- case HCI_ACLDATA_PKT:
- hdev->stat.acl_tx++;
- break;
- case HCI_SCODATA_PKT:
- hdev->stat.sco_tx++;
- break;
- }
- kfree_skb(skb);
- }
- if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state))
- break;
- }
- clear_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state);
- }
- static void btmtkuart_tx_wakeup(struct btmtkuart_dev *bdev)
- {
- if (test_and_set_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state))
- set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
- schedule_work(&bdev->tx_work);
- }
- static const unsigned char *
- mtk_stp_split(struct btmtkuart_dev *bdev, const unsigned char *data, int count,
- int *sz_h4)
- {
- struct mtk_stp_hdr *shdr;
- /* The cursor is reset when all the data of STP is consumed out */
- if (!bdev->stp_dlen && bdev->stp_cursor >= 6)
- bdev->stp_cursor = 0;
- /* Filling pad until all STP info is obtained */
- while (bdev->stp_cursor < 6 && count > 0) {
- bdev->stp_pad[bdev->stp_cursor] = *data;
- bdev->stp_cursor++;
- data++;
- count--;
- }
- /* Retrieve STP info and have a sanity check */
- if (!bdev->stp_dlen && bdev->stp_cursor >= 6) {
- shdr = (struct mtk_stp_hdr *)&bdev->stp_pad[2];
- bdev->stp_dlen = be16_to_cpu(shdr->dlen) & 0x0fff;
- /* Resync STP when unexpected data is being read */
- if (shdr->prefix != 0x80 || bdev->stp_dlen > 2048) {
- bt_dev_err(bdev->hdev, "stp format unexpect (%d, %d)",
- shdr->prefix, bdev->stp_dlen);
- bdev->stp_cursor = 2;
- bdev->stp_dlen = 0;
- }
- }
- /* Directly quit when there's no data found for H4 can process */
- if (count <= 0)
- return NULL;
- /* Tranlate to how much the size of data H4 can handle so far */
- *sz_h4 = min_t(int, count, bdev->stp_dlen);
- /* Update the remaining size of STP packet */
- bdev->stp_dlen -= *sz_h4;
- /* Data points to STP payload which can be handled by H4 */
- return data;
- }
- static int btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count)
- {
- struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
- const unsigned char *p_left = data, *p_h4;
- int sz_left = count, sz_h4, adv;
- int err;
- while (sz_left > 0) {
- /* The serial data received from MT7622 BT controller is
- * at all time padded around with the STP header and tailer.
- *
- * A full STP packet is looking like
- * -----------------------------------
- * | STP header | H:4 | STP tailer |
- * -----------------------------------
- * but it doesn't guarantee to contain a full H:4 packet which
- * means that it's possible for multiple STP packets forms a
- * full H:4 packet that means extra STP header + length doesn't
- * indicate a full H:4 frame, things can fragment. Whose length
- * recorded in STP header just shows up the most length the
- * H:4 engine can handle currently.
- */
- p_h4 = mtk_stp_split(bdev, p_left, sz_left, &sz_h4);
- if (!p_h4)
- break;
- adv = p_h4 - p_left;
- sz_left -= adv;
- p_left += adv;
- bdev->rx_skb = h4_recv_buf(bdev->hdev, bdev->rx_skb, p_h4,
- sz_h4, mtk_recv_pkts,
- ARRAY_SIZE(mtk_recv_pkts));
- if (IS_ERR(bdev->rx_skb)) {
- err = PTR_ERR(bdev->rx_skb);
- bt_dev_err(bdev->hdev,
- "Frame reassembly failed (%d)", err);
- bdev->rx_skb = NULL;
- return err;
- }
- sz_left -= sz_h4;
- p_left += sz_h4;
- }
- return 0;
- }
- static int btmtkuart_receive_buf(struct serdev_device *serdev, const u8 *data,
- size_t count)
- {
- struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
- int err;
- err = btmtkuart_recv(bdev->hdev, data, count);
- if (err < 0)
- return err;
- bdev->hdev->stat.byte_rx += count;
- return count;
- }
- static void btmtkuart_write_wakeup(struct serdev_device *serdev)
- {
- struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
- btmtkuart_tx_wakeup(bdev);
- }
- static const struct serdev_device_ops btmtkuart_client_ops = {
- .receive_buf = btmtkuart_receive_buf,
- .write_wakeup = btmtkuart_write_wakeup,
- };
- static int btmtkuart_open(struct hci_dev *hdev)
- {
- struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
- struct device *dev;
- int err;
- err = serdev_device_open(bdev->serdev);
- if (err) {
- bt_dev_err(hdev, "Unable to open UART device %s",
- dev_name(&bdev->serdev->dev));
- goto err_open;
- }
- if (btmtkuart_is_standalone(bdev)) {
- if (bdev->curr_speed != bdev->desired_speed)
- err = serdev_device_set_baudrate(bdev->serdev,
- 115200);
- else
- err = serdev_device_set_baudrate(bdev->serdev,
- bdev->desired_speed);
- if (err < 0) {
- bt_dev_err(hdev, "Unable to set baudrate UART device %s",
- dev_name(&bdev->serdev->dev));
- goto err_serdev_close;
- }
- serdev_device_set_flow_control(bdev->serdev, false);
- }
- bdev->stp_cursor = 2;
- bdev->stp_dlen = 0;
- dev = &bdev->serdev->dev;
- /* Enable the power domain and clock the device requires */
- pm_runtime_enable(dev);
- err = pm_runtime_get_sync(dev);
- if (err < 0) {
- pm_runtime_put_noidle(dev);
- goto err_disable_rpm;
- }
- err = clk_prepare_enable(bdev->clk);
- if (err < 0)
- goto err_put_rpm;
- return 0;
- err_put_rpm:
- pm_runtime_put_sync(dev);
- err_disable_rpm:
- pm_runtime_disable(dev);
- err_serdev_close:
- serdev_device_close(bdev->serdev);
- err_open:
- return err;
- }
- static int btmtkuart_close(struct hci_dev *hdev)
- {
- struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
- struct device *dev = &bdev->serdev->dev;
- /* Shutdown the clock and power domain the device requires */
- clk_disable_unprepare(bdev->clk);
- pm_runtime_put_sync(dev);
- pm_runtime_disable(dev);
- serdev_device_close(bdev->serdev);
- return 0;
- }
- static int btmtkuart_flush(struct hci_dev *hdev)
- {
- struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
- /* Flush any pending characters */
- serdev_device_write_flush(bdev->serdev);
- skb_queue_purge(&bdev->txq);
- cancel_work_sync(&bdev->tx_work);
- kfree_skb(bdev->rx_skb);
- bdev->rx_skb = NULL;
- bdev->stp_cursor = 2;
- bdev->stp_dlen = 0;
- return 0;
- }
- static int btmtkuart_func_query(struct hci_dev *hdev)
- {
- struct btmtk_hci_wmt_params wmt_params;
- int status, err;
- u8 param = 0;
- /* Query whether the function is enabled */
- wmt_params.op = MTK_WMT_FUNC_CTRL;
- wmt_params.flag = 4;
- wmt_params.dlen = sizeof(param);
- wmt_params.data = ¶m;
- wmt_params.status = &status;
- err = mtk_hci_wmt_sync(hdev, &wmt_params);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to query function status (%d)", err);
- return err;
- }
- return status;
- }
- static int btmtkuart_change_baudrate(struct hci_dev *hdev)
- {
- struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
- struct btmtk_hci_wmt_params wmt_params;
- __le32 baudrate;
- u8 param;
- int err;
- /* Indicate the device to enter the probe state the host is
- * ready to change a new baudrate.
- */
- baudrate = cpu_to_le32(bdev->desired_speed);
- wmt_params.op = MTK_WMT_HIF;
- wmt_params.flag = 1;
- wmt_params.dlen = 4;
- wmt_params.data = &baudrate;
- wmt_params.status = NULL;
- err = mtk_hci_wmt_sync(hdev, &wmt_params);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to device baudrate (%d)", err);
- return err;
- }
- err = serdev_device_set_baudrate(bdev->serdev,
- bdev->desired_speed);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to set up host baudrate (%d)",
- err);
- return err;
- }
- serdev_device_set_flow_control(bdev->serdev, false);
- /* Send a dummy byte 0xff to activate the new baudrate */
- param = 0xff;
- err = serdev_device_write_buf(bdev->serdev, ¶m, sizeof(param));
- if (err < 0 || err < sizeof(param))
- return err;
- serdev_device_wait_until_sent(bdev->serdev, 0);
- /* Wait some time for the device changing baudrate done */
- usleep_range(20000, 22000);
- /* Test the new baudrate */
- wmt_params.op = MTK_WMT_TEST;
- wmt_params.flag = 7;
- wmt_params.dlen = 0;
- wmt_params.data = NULL;
- wmt_params.status = NULL;
- err = mtk_hci_wmt_sync(hdev, &wmt_params);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to test new baudrate (%d)",
- err);
- return err;
- }
- bdev->curr_speed = bdev->desired_speed;
- return 0;
- }
- static int btmtkuart_setup(struct hci_dev *hdev)
- {
- struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
- struct btmtk_hci_wmt_params wmt_params;
- ktime_t calltime, delta, rettime;
- struct btmtk_tci_sleep tci_sleep;
- unsigned long long duration;
- struct sk_buff *skb;
- int err, status;
- u8 param = 0x1;
- calltime = ktime_get();
- /* Wakeup MCUSYS is required for certain devices before we start to
- * do any setups.
- */
- if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) {
- wmt_params.op = MTK_WMT_WAKEUP;
- wmt_params.flag = 3;
- wmt_params.dlen = 0;
- wmt_params.data = NULL;
- wmt_params.status = NULL;
- err = mtk_hci_wmt_sync(hdev, &wmt_params);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err);
- return err;
- }
- clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
- }
- if (btmtkuart_is_standalone(bdev))
- btmtkuart_change_baudrate(hdev);
- /* Query whether the firmware is already download */
- wmt_params.op = MTK_WMT_SEMAPHORE;
- wmt_params.flag = 1;
- wmt_params.dlen = 0;
- wmt_params.data = NULL;
- wmt_params.status = &status;
- err = mtk_hci_wmt_sync(hdev, &wmt_params);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to query firmware status (%d)", err);
- return err;
- }
- if (status == BTMTK_WMT_PATCH_DONE) {
- bt_dev_info(hdev, "Firmware already downloaded");
- goto ignore_setup_fw;
- }
- /* Setup a firmware which the device definitely requires */
- err = mtk_setup_firmware(hdev, bdev->data->fwname);
- if (err < 0)
- return err;
- ignore_setup_fw:
- /* Query whether the device is already enabled */
- err = readx_poll_timeout(btmtkuart_func_query, hdev, status,
- status < 0 || status != BTMTK_WMT_ON_PROGRESS,
- 2000, 5000000);
- /* -ETIMEDOUT happens */
- if (err < 0)
- return err;
- /* The other errors happen in btusb_mtk_func_query */
- if (status < 0)
- return status;
- if (status == BTMTK_WMT_ON_DONE) {
- bt_dev_info(hdev, "function already on");
- goto ignore_func_on;
- }
- /* Enable Bluetooth protocol */
- wmt_params.op = MTK_WMT_FUNC_CTRL;
- wmt_params.flag = 0;
- wmt_params.dlen = sizeof(param);
- wmt_params.data = ¶m;
- wmt_params.status = NULL;
- err = mtk_hci_wmt_sync(hdev, &wmt_params);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
- return err;
- }
- ignore_func_on:
- /* Apply the low power environment setup */
- tci_sleep.mode = 0x5;
- tci_sleep.duration = cpu_to_le16(0x640);
- tci_sleep.host_duration = cpu_to_le16(0x640);
- tci_sleep.host_wakeup_pin = 0;
- tci_sleep.time_compensation = 0;
- skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep,
- HCI_INIT_TIMEOUT);
- if (IS_ERR(skb)) {
- err = PTR_ERR(skb);
- bt_dev_err(hdev, "Failed to apply low power setting (%d)", err);
- return err;
- }
- kfree_skb(skb);
- rettime = ktime_get();
- delta = ktime_sub(rettime, calltime);
- duration = (unsigned long long)ktime_to_ns(delta) >> 10;
- bt_dev_info(hdev, "Device setup in %llu usecs", duration);
- return 0;
- }
- static int btmtkuart_shutdown(struct hci_dev *hdev)
- {
- struct btmtk_hci_wmt_params wmt_params;
- u8 param = 0x0;
- int err;
- /* Disable the device */
- wmt_params.op = MTK_WMT_FUNC_CTRL;
- wmt_params.flag = 0;
- wmt_params.dlen = sizeof(param);
- wmt_params.data = ¶m;
- wmt_params.status = NULL;
- err = mtk_hci_wmt_sync(hdev, &wmt_params);
- if (err < 0) {
- bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
- return err;
- }
- return 0;
- }
- static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
- {
- struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
- struct mtk_stp_hdr *shdr;
- int err, dlen, type = 0;
- /* Prepend skb with frame type */
- memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
- /* Make sure that there is enough rooms for STP header and trailer */
- if (unlikely(skb_headroom(skb) < sizeof(*shdr)) ||
- (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) {
- err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE,
- GFP_ATOMIC);
- if (err < 0)
- return err;
- }
- /* Add the STP header */
- dlen = skb->len;
- shdr = skb_push(skb, sizeof(*shdr));
- shdr->prefix = 0x80;
- shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12));
- shdr->cs = 0; /* MT7622 doesn't care about checksum value */
- /* Add the STP trailer */
- skb_put_zero(skb, MTK_STP_TLR_SIZE);
- skb_queue_tail(&bdev->txq, skb);
- btmtkuart_tx_wakeup(bdev);
- return 0;
- }
- static int btmtkuart_parse_dt(struct serdev_device *serdev)
- {
- struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
- struct device_node *node = serdev->dev.of_node;
- u32 speed = 921600;
- int err;
- if (btmtkuart_is_standalone(bdev)) {
- of_property_read_u32(node, "current-speed", &speed);
- bdev->desired_speed = speed;
- bdev->vcc = devm_regulator_get(&serdev->dev, "vcc");
- if (IS_ERR(bdev->vcc)) {
- err = PTR_ERR(bdev->vcc);
- return err;
- }
- bdev->osc = devm_clk_get_optional(&serdev->dev, "osc");
- if (IS_ERR(bdev->osc)) {
- err = PTR_ERR(bdev->osc);
- return err;
- }
- bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot",
- GPIOD_OUT_LOW);
- if (IS_ERR(bdev->boot)) {
- err = PTR_ERR(bdev->boot);
- return err;
- }
- bdev->pinctrl = devm_pinctrl_get(&serdev->dev);
- if (IS_ERR(bdev->pinctrl)) {
- err = PTR_ERR(bdev->pinctrl);
- return err;
- }
- bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl,
- "default");
- if (IS_ERR(bdev->pins_boot) && !bdev->boot) {
- err = PTR_ERR(bdev->pins_boot);
- dev_err(&serdev->dev,
- "Should assign RXD to LOW at boot stage\n");
- return err;
- }
- bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl,
- "runtime");
- if (IS_ERR(bdev->pins_runtime)) {
- err = PTR_ERR(bdev->pins_runtime);
- return err;
- }
- bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset",
- GPIOD_OUT_LOW);
- if (IS_ERR(bdev->reset)) {
- err = PTR_ERR(bdev->reset);
- return err;
- }
- } else if (btmtkuart_is_builtin_soc(bdev)) {
- bdev->clk = devm_clk_get(&serdev->dev, "ref");
- if (IS_ERR(bdev->clk))
- return PTR_ERR(bdev->clk);
- }
- return 0;
- }
- static int btmtkuart_probe(struct serdev_device *serdev)
- {
- struct btmtkuart_dev *bdev;
- struct hci_dev *hdev;
- int err;
- bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL);
- if (!bdev)
- return -ENOMEM;
- bdev->data = of_device_get_match_data(&serdev->dev);
- if (!bdev->data)
- return -ENODEV;
- bdev->serdev = serdev;
- serdev_device_set_drvdata(serdev, bdev);
- serdev_device_set_client_ops(serdev, &btmtkuart_client_ops);
- err = btmtkuart_parse_dt(serdev);
- if (err < 0)
- return err;
- INIT_WORK(&bdev->tx_work, btmtkuart_tx_work);
- skb_queue_head_init(&bdev->txq);
- /* Initialize and register HCI device */
- hdev = hci_alloc_dev();
- if (!hdev) {
- dev_err(&serdev->dev, "Can't allocate HCI device\n");
- return -ENOMEM;
- }
- bdev->hdev = hdev;
- hdev->bus = HCI_UART;
- hci_set_drvdata(hdev, bdev);
- hdev->open = btmtkuart_open;
- hdev->close = btmtkuart_close;
- hdev->flush = btmtkuart_flush;
- hdev->setup = btmtkuart_setup;
- hdev->shutdown = btmtkuart_shutdown;
- hdev->send = btmtkuart_send_frame;
- SET_HCIDEV_DEV(hdev, &serdev->dev);
- hdev->manufacturer = 70;
- set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
- if (btmtkuart_is_standalone(bdev)) {
- err = clk_prepare_enable(bdev->osc);
- if (err < 0)
- goto err_hci_free_dev;
- if (bdev->boot) {
- gpiod_set_value_cansleep(bdev->boot, 1);
- } else {
- /* Switch to the specific pin state for the booting
- * requires.
- */
- pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);
- }
- /* Power on */
- err = regulator_enable(bdev->vcc);
- if (err < 0)
- goto err_clk_disable_unprepare;
- /* Reset if the reset-gpios is available otherwise the board
- * -level design should be guaranteed.
- */
- if (bdev->reset) {
- gpiod_set_value_cansleep(bdev->reset, 1);
- usleep_range(1000, 2000);
- gpiod_set_value_cansleep(bdev->reset, 0);
- }
- /* Wait some time until device got ready and switch to the pin
- * mode the device requires for UART transfers.
- */
- msleep(50);
- if (bdev->boot)
- devm_gpiod_put(&serdev->dev, bdev->boot);
- pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime);
- /* A standalone device doesn't depends on power domain on SoC,
- * so mark it as no callbacks.
- */
- pm_runtime_no_callbacks(&serdev->dev);
- set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
- }
- err = hci_register_dev(hdev);
- if (err < 0) {
- dev_err(&serdev->dev, "Can't register HCI device\n");
- goto err_regulator_disable;
- }
- return 0;
- err_regulator_disable:
- if (btmtkuart_is_standalone(bdev))
- regulator_disable(bdev->vcc);
- err_clk_disable_unprepare:
- if (btmtkuart_is_standalone(bdev))
- clk_disable_unprepare(bdev->osc);
- err_hci_free_dev:
- hci_free_dev(hdev);
- return err;
- }
- static void btmtkuart_remove(struct serdev_device *serdev)
- {
- struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
- struct hci_dev *hdev = bdev->hdev;
- if (btmtkuart_is_standalone(bdev)) {
- regulator_disable(bdev->vcc);
- clk_disable_unprepare(bdev->osc);
- }
- hci_unregister_dev(hdev);
- hci_free_dev(hdev);
- }
- static const struct btmtkuart_data mt7622_data = {
- .fwname = FIRMWARE_MT7622,
- };
- static const struct btmtkuart_data mt7663_data = {
- .flags = BTMTKUART_FLAG_STANDALONE_HW,
- .fwname = FIRMWARE_MT7663,
- };
- static const struct btmtkuart_data mt7668_data = {
- .flags = BTMTKUART_FLAG_STANDALONE_HW,
- .fwname = FIRMWARE_MT7668,
- };
- #ifdef CONFIG_OF
- static const struct of_device_id mtk_of_match_table[] = {
- { .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data},
- { .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data},
- { .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data},
- { }
- };
- MODULE_DEVICE_TABLE(of, mtk_of_match_table);
- #endif
- static struct serdev_device_driver btmtkuart_driver = {
- .probe = btmtkuart_probe,
- .remove = btmtkuart_remove,
- .driver = {
- .name = "btmtkuart",
- .of_match_table = of_match_ptr(mtk_of_match_table),
- },
- };
- module_serdev_device_driver(btmtkuart_driver);
- MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
- MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION);
- MODULE_VERSION(VERSION);
- MODULE_LICENSE("GPL");
- MODULE_FIRMWARE(FIRMWARE_MT7622);
- MODULE_FIRMWARE(FIRMWARE_MT7663);
- MODULE_FIRMWARE(FIRMWARE_MT7668);
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