Re: [PATCH 2/4] Bluetooth: hci_uart: Add support for Amlogic HCI UART

From: Luiz Augusto von Dentz
Date: Tue Jul 09 2024 - 10:41:56 EST

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Hi,

On Fri, Jul 5, 2024 at 7:21 AM Yang Li via B4 Relay
<devnull+yang.li.amlogic.com@xxxxxxxxxx> wrote:
>
> From: Yang Li <yang.li@xxxxxxxxxxx>
>
> This patch introduces support for Amlogic Bluetooth controller over
> UART. In order to send the final firmware at full speed. It is a pretty
> straight forward H4 driver with exception of actually having it's own
> setup address configuration.
>
> Co-developed-by: Ye He <ye.he@xxxxxxxxxxx>
> Signed-off-by: Yang Li <yang.li@xxxxxxxxxxx>
> ---
> drivers/bluetooth/Kconfig | 13 +
> drivers/bluetooth/Makefile | 1 +
> drivers/bluetooth/hci_aml.c | 749 ++++++++++++++++++++++++++++++++++++++++++
> drivers/bluetooth/hci_ldisc.c | 8 +-
> drivers/bluetooth/hci_uart.h | 8 +-
> 5 files changed, 776 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> index 87484f5de8e3..634479e10cb7 100644
> --- a/drivers/bluetooth/Kconfig
> +++ b/drivers/bluetooth/Kconfig
> @@ -273,6 +273,19 @@ config BT_HCIUART_MRVL
>
> Say Y here to compile support for HCI MRVL protocol.
>
> +config BT_HCIUART_AML
> + bool "Amlogic protocol support"
> + depends on BT_HCIUART
> + depends on BT_HCIUART_SERDEV
> + select BT_HCIUART_H4
> + select FW_LOADER
> + select POWER_SEQUENCING_AML_WCN
> + help
> + The Amlogic protocol support enables Bluetooth HCI over serial
> + port interface for Amlogic Bluetooth controllers.
> +
> + Say Y here to compile support for HCI AML protocol.
> +
> config BT_HCIBCM203X
> tristate "HCI BCM203x USB driver"
> depends on USB
> diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
> index 0730d6684d1a..81856512ddd0 100644
> --- a/drivers/bluetooth/Makefile
> +++ b/drivers/bluetooth/Makefile
> @@ -51,4 +51,5 @@ 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-$(CONFIG_BT_HCIUART_AML) += hci_aml.o
> hci_uart-objs := $(hci_uart-y)
> diff --git a/drivers/bluetooth/hci_aml.c b/drivers/bluetooth/hci_aml.c
> new file mode 100644
> index 000000000000..33a27a555343
> --- /dev/null
> +++ b/drivers/bluetooth/hci_aml.c
> @@ -0,0 +1,749 @@
> +// SPDX-License-Identifier: (GPL-2.0-only OR MIT)
> +/*
> + * Copyright (C) 2024 Amlogic, Inc. All rights reserved
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/gpio.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of.h>
> +#include <linux/serdev.h>
> +#include <linux/pwm.h>
> +#include <linux/clk.h>
> +#include <linux/mutex.h>
> +#include <asm/unaligned.h>
> +#include <linux/firmware.h>
> +#include <linux/vmalloc.h>
> +#include <linux/pwrseq/consumer.h>
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +#include <net/bluetooth/hci.h>
> +
> +#include "hci_uart.h"
> +
> +#define AML_EVT_HEAD_SIZE 4
> +#define AML_BDADDR_DEFAULT (&(bdaddr_t) {{ 0x00, 0xff, 0x00, 0x22, 0x2d, 0xae }})
> +
> +#define AML_FIRMWARE_OPERATION_SIZE (248)
> +#define AML_FIRMWARE_MAX_SIZE (512 * 1024)
> +
> +/* waiting time (ms) */
> +#define AML_WAIT_CHIP_START_UP (350)
> +
> +/* TCI command */
> +#define AML_TCI_CMD_READ 0xFEF0
> +#define AML_TCI_CMD_WRITE 0xFEF1
> +#define AML_TCI_CMD_UPDATE_BAUDRATE 0xFEF2
> +#define AML_TCI_CMD_HARDWARE_RESET 0xFEF2
> +#define AML_TCI_CMD_DOWNLOAD_BT_FW 0xFEF3
> +#define AML_BT_HCI_VENDOR_CMD 0xFC1A
> +
> +/* TCI operation parameter in controller chip */
> +#define AML_OP_UART_MODE 0x00A30128
> +#define AML_OP_EVT_ENABLE 0x00A70014
> +#define AML_OP_MEM_HARD_TRANS_EN 0x00A7000C
> +#define AML_OP_RF_CFG 0x00F03040
> +#define AML_OP_RAM_POWER_CTR 0x00F03050
> +#define AML_OP_HARDWARE_RST 0x00F03058
> +#define AML_OP_ICCM_RAM_BASE 0x00000000
> +#define AML_OP_DCCM_RAM_BASE 0x00D00000
> +
> +/* uart configuration */
> +#define AML_UART_XMIT_EN BIT(12)
> +#define AML_UART_RECV_EN BIT(13)
> +#define AML_UART_TIMEOUT_INT_EN BIT(14)
> +#define AML_UART_CLK_SOURCE 40000000
> +
> +/* controller event enable/disable */
> +#define AML_EVT_EN BIT(24)
> +
> +/* RAM power down control */
> +#define AML_RAM_POWER_ON (0)
> +#define AML_RAM_POWER_OFF (1)
> +
> +/* RF configuration */
> +#define AML_RF_A2DP_SINK_EN BIT(25)
> +#define AML_RF_ANT_SINGLE BIT(28)
> +#define AML_RF_ANT_DOUBLE BIT(29)
> +#define AML_RF_ANT_BASE (28)
> +#define AML_BT_CTR_SET_ANT(ant_num) (BIT(((ant_num) - 1)) << AML_RF_ANT_BASE)
> +
> +/* memory control hard transaction */
> +#define AML_MM_CTR_HARD_TRAS_EN BIT(27)
> +
> +/* controller hardware reset */
> +#define AML_CTR_CPU_RESET BIT(8)
> +#define AML_CTR_MAC_RESET BIT(9)
> +#define AML_CTR_PHY_RESET BIT(10)
> +
> +enum {
> + FW_ICCM,
> + FW_DCCM
> +};
> +
> +struct aml_fw_len {
> + u32 iccm_len;
> + u32 dccm_len;
> +};
> +
> +struct aml_tci_rsp {
> + u8 num_cmd_packet;
> + u16 opcode;
> + u8 status;
> +} __packed;
> +
> +struct aml_rf_cfg {
> + u32 ant_number;
> + u32 a2dp_sink_en;
> +};
> +
> +struct aml_serdev {
> + struct hci_uart serdev_hu;
> + struct device *dev;
> + struct aml_rf_cfg rf_cfg;
> + struct pwrseq_desc *pwrseq;
> + const char *firmware_name;
> + int iccm_offset;
> + int dccm_offset;
> +};
> +
> +struct aml_data {
> + struct sk_buff *rx_skb;
> + struct sk_buff_head txq;
> +};
> +
> +struct aml_device_data {
> + int iccm_offset;
> + int dccm_offset;
> +};
> +
> +static const struct h4_recv_pkt aml_recv_pkts[] = {
> + {H4_RECV_ACL, .recv = hci_recv_frame},
> + {H4_RECV_SCO, .recv = hci_recv_frame},
> + {H4_RECV_EVENT, .recv = hci_recv_frame},
> + {H4_RECV_ISO, .recv = hci_recv_frame},
> +};
> +
> +/* The TCI command is private of Amlogic, it is used to configure before BT chip
> + * startup, contains update baudrate, update firmware, set public addr ...
> + * op_code | op_len | op_addr | parameter |
> + * --------|-----------------------|---------|-------------|
> + * 2B | 1B len(addr+param) | 4B | len(param) |
> + */
> +static int aml_send_tci_cmd(struct hci_dev *hdev, u16 op_code, u32 op_addr,
> + u32 *param, u32 param_len)
> +{
> + struct sk_buff *skb = NULL;
> + struct aml_tci_rsp *rsp = NULL;
> + u8 *buf = NULL;
> + u32 buf_len = 0;
> + int err = 0;
> +
> + buf_len = sizeof(op_addr) + param_len;
> + buf = vmalloc(buf_len);
> + if (!buf) {
> + BT_ERR("Failed to alloc memory.");
> + err = -ENOMEM;
> + goto exit;
> + }
> +
> + memcpy(buf, &op_addr, sizeof(op_addr));
> + if (param && param_len > 0)
> + memcpy(buf + sizeof(op_addr), param, param_len);
> +
> + skb = __hci_cmd_sync_ev(hdev, op_code, buf_len, buf,
> + HCI_EV_CMD_COMPLETE, HCI_INIT_TIMEOUT);
> + if (IS_ERR(skb)) {
> + err = PTR_ERR(skb);
> + skb = NULL;
> + BT_ERR("Failed to send TCI cmd:(%d)", err);
> + goto exit;
> + }
> +
> + rsp = (struct aml_tci_rsp *)(skb->data);
> + if (rsp->opcode != op_code || rsp->status != 0x00) {
> + BT_ERR("send TCI cmd(0x%04X), response(0x%04X):(%d)",
> + op_code, rsp->opcode, rsp->status);
> + err = -EINVAL;
> + goto exit;
> + }
> +
> +exit:
> + if (buf)
> + vfree(buf);
> + if (skb)
> + kfree_skb(skb);
> + return err;
> +}
> +
> +static int aml_update_chip_baudrate(struct hci_dev *hdev, u32 baud)
> +{
> + u32 value;
> +
> + value = ((AML_UART_CLK_SOURCE / baud) - 1) & 0x0FFF;
> + value |= AML_UART_XMIT_EN | AML_UART_RECV_EN | AML_UART_TIMEOUT_INT_EN;
> +
> + return aml_send_tci_cmd(hdev, AML_TCI_CMD_UPDATE_BAUDRATE,
> + AML_OP_UART_MODE, &value, sizeof(value));
> +}
> +
> +static int aml_start_chip(struct hci_dev *hdev)
> +{
> + u32 value = 0;
> + int ret;
> +
> + value = AML_MM_CTR_HARD_TRAS_EN;
> + ret = aml_send_tci_cmd(hdev, AML_TCI_CMD_WRITE,
> + AML_OP_MEM_HARD_TRANS_EN,
> + &value, sizeof(value));
> + if (ret)
> + return ret;
> +
> + /* controller hardware reset. */
> + value = AML_CTR_CPU_RESET | AML_CTR_MAC_RESET | AML_CTR_PHY_RESET;
> + ret = aml_send_tci_cmd(hdev, AML_TCI_CMD_HARDWARE_RESET,
> + AML_OP_HARDWARE_RST,
> + &value, sizeof(value));
> + return ret;
> +}
> +
> +static int aml_send_firmware_segment(struct hci_dev *hdev,
> + u8 fw_type,
> + u8 *seg,
> + u32 seg_size,
> + u32 offset)
> +{
> + u32 op_addr = 0;
> +
> + if (fw_type == FW_ICCM)
> + op_addr = AML_OP_ICCM_RAM_BASE + offset;
> + else if (fw_type == FW_DCCM)
> + op_addr = AML_OP_DCCM_RAM_BASE + offset;
> +
> + return aml_send_tci_cmd(hdev, AML_TCI_CMD_DOWNLOAD_BT_FW,
> + op_addr, (u32 *)seg, seg_size);
> +}
> +
> +static int aml_send_firmware(struct hci_dev *hdev, u8 fw_type,
> + u8 *fw, u32 fw_size, u32 offset)
> +{
> + u32 seg_size = 0;
> + u32 seg_off = 0;
> +
> + if (fw_size > AML_FIRMWARE_MAX_SIZE) {
> + BT_ERR("fw_size error, fw_size:%d, max_size: %d",
> + fw_size, AML_FIRMWARE_MAX_SIZE);
> + return -EINVAL;
> + }
> + while (fw_size > 0) {
> + seg_size = (fw_size > AML_FIRMWARE_OPERATION_SIZE) ?
> + AML_FIRMWARE_OPERATION_SIZE : fw_size;
> + if (aml_send_firmware_segment(hdev, fw_type, (fw + seg_off),
> + seg_size, offset)) {
> + BT_ERR("Failed send firmware, type:%d, offset:0x%x",
> + fw_type, offset);
> + return -EINVAL;
> + }
> + seg_off += seg_size;
> + fw_size -= seg_size;
> + offset += seg_size;
> + }
> + return 0;
> +}
> +
> +static int aml_download_firmware(struct hci_dev *hdev, const char *fw_name)
> +{
> + struct hci_uart *hu = hci_get_drvdata(hdev);
> + struct aml_serdev *amldev = serdev_device_get_drvdata(hu->serdev);
> + const struct firmware *firmware = NULL;
> + struct aml_fw_len *fw_len = NULL;
> + u8 *iccm_start = NULL, *dccm_start = NULL;
> + u32 iccm_len, dccm_len;
> + u32 value = 0;
> + int ret = 0;
> +
> + /* enable firmware download event. */
> + value = AML_EVT_EN;
> + ret = aml_send_tci_cmd(hdev, AML_TCI_CMD_WRITE,
> + AML_OP_EVT_ENABLE,
> + &value, sizeof(value));
> + if (ret)
> + goto exit;
> +
> + /* RAM power on */
> + value = AML_RAM_POWER_ON;
> + ret = aml_send_tci_cmd(hdev, AML_TCI_CMD_WRITE,
> + AML_OP_RAM_POWER_CTR,
> + &value, sizeof(value));
> + if (ret)
> + goto exit;
> +
> + /* check RAM power status */
> + ret = aml_send_tci_cmd(hdev, AML_TCI_CMD_READ,
> + AML_OP_RAM_POWER_CTR, NULL, 0);
> + if (ret)
> + goto exit;
> +
> + ret = request_firmware(&firmware, fw_name, &hdev->dev);
> + if (ret < 0) {
> + BT_ERR("Failed to load <%s>:(%d)", fw_name, ret);
> + goto exit;
> + }
> +
> + fw_len = (struct aml_fw_len *)firmware->data;
> +
> + /* download ICCM. */
> + iccm_start = (u8 *)(firmware->data) + sizeof(struct aml_fw_len) + amldev->iccm_offset;
> + iccm_len = fw_len->iccm_len - amldev->iccm_offset;
> + ret = aml_send_firmware(hdev, FW_ICCM, iccm_start, iccm_len, amldev->iccm_offset);
> + if (ret) {
> + BT_ERR("Failed to send FW_ICCM");
> + goto exit;
> + }
> +
> + /* download DCCM. */
> + dccm_start = (u8 *)(firmware->data) + sizeof(struct aml_fw_len) + fw_len->iccm_len;
> + dccm_len = fw_len->dccm_len;
> + ret = aml_send_firmware(hdev, FW_DCCM, dccm_start, dccm_len, amldev->dccm_offset);
> + if (ret) {
> + BT_ERR("Failed to send FW_DCCM");
> + goto exit;
> + }
> +
> + /* disable firmware download event. */
> + value = 0;
> + ret = aml_send_tci_cmd(hdev, AML_TCI_CMD_WRITE,
> + AML_OP_EVT_ENABLE,
> + &value, sizeof(value));
> + if (ret)
> + goto exit;
> +
> +exit:
> + if (firmware)
> + release_firmware(firmware);
> + return ret;
> +}
> +
> +static int aml_send_reset(struct hci_dev *hdev)
> +{
> + struct sk_buff *skb;
> + int err;
> +
> + skb = __hci_cmd_sync_ev(hdev, HCI_OP_RESET, 0, NULL,
> + HCI_EV_CMD_COMPLETE, HCI_INIT_TIMEOUT);
> + if (IS_ERR(skb)) {
> + err = PTR_ERR(skb);
> + BT_ERR("Failed to send hci reset cmd(%d)", err);
> + return err;
> + }
> + kfree_skb(skb);
> + return 0;
> +}
> +
> +static int aml_dump_fw_version(struct hci_dev *hdev)
> +{
> + struct sk_buff *skb;
> + struct aml_tci_rsp *rsp = NULL;
> + u8 value[6] = {0};
> + u8 *fw_ver = NULL;
> + int err = 0;
> +
> + skb = __hci_cmd_sync_ev(hdev, AML_BT_HCI_VENDOR_CMD, sizeof(value), value,
> + HCI_EV_CMD_COMPLETE, HCI_INIT_TIMEOUT);
> + if (IS_ERR(skb)) {
> + skb = NULL;
> + err = PTR_ERR(skb);
> + BT_ERR("Failed get fw version:(%d)", err);
> + goto exit;
> + }
> +
> + rsp = (struct aml_tci_rsp *)(skb->data);
> + if (rsp->opcode != AML_BT_HCI_VENDOR_CMD || rsp->status != 0x00) {
> + BT_ERR("dump version, error response (0x%04X):(%d)",
> + rsp->opcode, rsp->status);
> + err = -EINVAL;
> + goto exit;
> + }
> +
> + fw_ver = skb->data + AML_EVT_HEAD_SIZE;
> + BT_INFO("fw_version: date = %02x.%02x, number = 0x%02x%02x",
> + *(fw_ver + 1), *fw_ver, *(fw_ver + 3), *(fw_ver + 2));
> +
> +exit:
> + if (skb)
> + kfree_skb(skb);
> + return err;
> +}
> +
> +static int aml_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
> +{
> + struct sk_buff *skb;
> + struct aml_tci_rsp *rsp = NULL;
> + int err = 0;
> +
> + BT_INFO("set bdaddr (%pM)", bdaddr);
> + skb = __hci_cmd_sync_ev(hdev, AML_BT_HCI_VENDOR_CMD,
> + sizeof(bdaddr_t), bdaddr,
> + HCI_EV_CMD_COMPLETE, HCI_INIT_TIMEOUT);
> + if (IS_ERR(skb)) {
> + skb = NULL;
> + err = PTR_ERR(skb);
> + BT_ERR("Failed to set bdaddr:(%d)", err);
> + goto exit;
> + }
> +
> + rsp = (struct aml_tci_rsp *)(skb->data);
> + if (rsp->opcode != AML_BT_HCI_VENDOR_CMD || rsp->status != 0x00) {
> + BT_ERR("error response (0x%x):(%d)", rsp->opcode, rsp->status);
> + err = -EINVAL;
> + goto exit;
> + }
> +
> +exit:
> + if (skb)
> + kfree_skb(skb);
> + return err;
> +}
> +
> +static int aml_check_bdaddr(struct hci_dev *hdev)
> +{
> + struct hci_rp_read_bd_addr *paddr;
> + struct sk_buff *skb;
> + int err;
> +
> + if (bacmp(&hdev->public_addr, BDADDR_ANY))
> + return 0;
> +
> + skb = __hci_cmd_sync(hdev, HCI_OP_READ_BD_ADDR, 0, NULL,
> + HCI_INIT_TIMEOUT);
> + if (IS_ERR(skb)) {
> + err = PTR_ERR(skb);
> + BT_ERR("Failed to read bdaddr:(%d)", err);
> + return err;
> + }
> +
> + if (skb->len != sizeof(*paddr)) {
> + BT_ERR("Device address length mismatch");
> + kfree_skb(skb);
> + return -EIO;
> + }
> +
> + paddr = (struct hci_rp_read_bd_addr *)skb->data;
> + if (!bacmp(&paddr->bdaddr, AML_BDADDR_DEFAULT)) {
> + BT_INFO("amlbt using default bdaddr (%pM)", &paddr->bdaddr);
> + set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
> + }
> +
> + kfree_skb(skb);
> +
> + return 0;
> +}
> +
> +static int aml_config_rf(struct hci_dev *hdev, struct aml_rf_cfg *cfg)
> +{
> + u32 value = 0;
> +
> + if (cfg->a2dp_sink_en)
> + value |= AML_RF_A2DP_SINK_EN;
> +
> + if (cfg->ant_number > 0)
> + value |= AML_BT_CTR_SET_ANT(cfg->ant_number);
> +
> + return aml_send_tci_cmd(hdev, AML_TCI_CMD_WRITE,
> + AML_OP_RF_CFG,
> + &value, sizeof(value));
> +}
> +
> +static int aml_parse_resource(struct aml_serdev *amldev)
> +{
> + struct device *pdev = amldev->dev;
> +
> + /* get firmware path*/
> + if (of_property_read_string(pdev->of_node, "amlogic,firmware",
> + &amldev->firmware_name)) {
> + dev_err(pdev, "Failed to read firmware path");
> + return -ENODEV;
> + }
> + BT_DBG("firmware path:%s", amldev->firmware_name);

Please replace uses of BT_DBG with bt_dev_dbg.

> + /* get controller config parameter */
> + if (of_property_read_u32(pdev->of_node, "amlogic,antenna-number",
> + &amldev->rf_cfg.ant_number)) {
> + dev_info(pdev, "No antenna-number, using default value");
> + amldev->rf_cfg.ant_number = 1;
> + }
> +
> + if (of_property_read_u32(pdev->of_node, "amlogic,a2dp-sink-enable",
> + &amldev->rf_cfg.a2dp_sink_en)) {
> + dev_info(pdev, "No a2dp-sink-enable, using default value");
> + amldev->rf_cfg.a2dp_sink_en = 0;
> + }
> + BT_DBG("rf_config ant_num:%d, a2dp_sink_en:%d",
> + amldev->rf_cfg.ant_number, amldev->rf_cfg.a2dp_sink_en);
> + return 0;
> +}
> +
> +static int aml_set_baudrate(struct hci_uart *hu, unsigned int speed)
> +{
> + struct aml_serdev *amldev = serdev_device_get_drvdata(hu->serdev);
> + struct hci_dev *hdev = amldev->serdev_hu.hdev;
> +
> + /* update controller baudrate*/
> + if (aml_update_chip_baudrate(hdev, speed) != 0) {
> + BT_ERR("Failed to update baud rate");

Replace instances of BT_ERR with bt_dev_err.

> + return -EINVAL;
> + }
> +
> + /* update local baudrate*/
> + serdev_device_set_baudrate(hu->serdev, speed);
> +
> + return 0;
> +}
> +
> +/* Initialize protocol */
> +static int aml_open(struct hci_uart *hu)
> +{
> + struct aml_data *aml_data;
> + struct aml_serdev *amldev = serdev_device_get_drvdata(hu->serdev);
> +
> + if (aml_parse_resource(amldev)) {
> + BT_ERR("Failed to parse resource");
> + return -EINVAL;
> + }
> +
> + if (pwrseq_power_on(amldev->pwrseq)) {
> + BT_ERR("Failed to power on chipset");
> + return -EPERM;
> + }
> +
> + if (!hci_uart_has_flow_control(hu)) {
> + BT_ERR("no flow control");
> + return -EOPNOTSUPP;
> + }
> +
> + aml_data = kzalloc(sizeof(*aml_data), GFP_KERNEL);
> + if (!aml_data) {
> + BT_ERR("Failed to kzalloc with aml_data");
> + return -ENOMEM;
> + }
> +
> + skb_queue_head_init(&aml_data->txq);
> +
> + hu->priv = aml_data;
> +
> + return 0;
> +}
> +
> +/* Close protocol */
> +static int aml_close(struct hci_uart *hu)
> +{
> + struct aml_data *aml_data = hu->priv;
> + struct aml_serdev *amldev = serdev_device_get_drvdata(hu->serdev);
> +
> + if (hu->serdev)
> + serdev_device_close(hu->serdev);
> +
> + skb_queue_purge(&aml_data->txq);
> + kfree_skb(aml_data->rx_skb);
> + kfree(aml_data);
> +
> + hu->priv = NULL;
> +
> + return pwrseq_power_off(amldev->pwrseq);
> +}
> +
> +static int aml_flush(struct hci_uart *hu)
> +{
> + struct aml_data *aml_data = hu->priv;
> +
> + skb_queue_purge(&aml_data->txq);
> +
> + return 0;
> +}
> +
> +static int aml_setup(struct hci_uart *hu)
> +{
> + struct aml_serdev *amldev = serdev_device_get_drvdata(hu->serdev);
> + struct hci_dev *hdev = amldev->serdev_hu.hdev;
> + int err;
> +
> + /* Setup bdaddr */
> + hdev->set_bdaddr = aml_set_bdaddr;
> +
> + err = aml_set_baudrate(hu, amldev->serdev_hu.proto->oper_speed);
> + if (err)
> + return err;
> +
> + err = aml_download_firmware(hdev, amldev->firmware_name);
> + if (err)
> + return err;
> +
> + err = aml_config_rf(hdev, &amldev->rf_cfg);
> + if (err)
> + return err;
> +
> + err = aml_start_chip(hdev);
> + if (err)
> + return err;
> +
> + /* wait 350ms for controller start up*/
> + msleep(AML_WAIT_CHIP_START_UP);
> +
> + err = aml_dump_fw_version(hdev);
> + if (err)
> + return err;
> +
> + err = aml_send_reset(hdev);
> + if (err)
> + return err;
> +
> + err = aml_check_bdaddr(hdev);
> + if (err)
> + return err;
> +
> + return 0;
> +}
> +
> +static int aml_enqueue(struct hci_uart *hu, struct sk_buff *skb)
> +{
> + struct aml_data *aml_data = hu->priv;
> +
> + skb_queue_tail(&aml_data->txq, skb);
> +
> + return 0;
> +}
> +
> +static struct sk_buff *aml_dequeue(struct hci_uart *hu)
> +{
> + struct aml_data *aml_data = hu->priv;
> + struct sk_buff *skb;
> +
> + skb = skb_dequeue(&aml_data->txq);
> +
> + /* Prepend skb with frame type */
> + if (skb)
> + memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
> +
> + return skb;
> +}
> +
> +static int aml_recv(struct hci_uart *hu, const void *data, int count)
> +{
> + struct aml_data *aml_data = hu->priv;
> + int err;
> +
> + aml_data->rx_skb = h4_recv_buf(hu->hdev, aml_data->rx_skb, data, count,
> + aml_recv_pkts,
> + ARRAY_SIZE(aml_recv_pkts));
> + if (IS_ERR(aml_data->rx_skb)) {
> + err = PTR_ERR(aml_data->rx_skb);
> + bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
> + aml_data->rx_skb = NULL;
> + return err;
> + }
> +
> + return count;
> +}
> +
> +static const struct hci_uart_proto aml_hci_proto = {
> + .id = HCI_UART_AML,
> + .name = "AML",
> + .manufacturer = 50,
> + .init_speed = 115200,
> + .oper_speed = 4000000,
> + .open = aml_open,
> + .close = aml_close,
> + .setup = aml_setup,
> + .flush = aml_flush,
> + .recv = aml_recv,
> + .enqueue = aml_enqueue,
> + .dequeue = aml_dequeue,
> +};
> +
> +static void aml_device_driver_shutdown(struct device *dev)
> +{
> + struct aml_serdev *amldev = dev_get_drvdata(dev);
> +
> + pwrseq_power_off(amldev->pwrseq);
> +}
> +
> +static int aml_serdev_probe(struct serdev_device *serdev)
> +{
> + struct aml_serdev *amldev;
> + const struct aml_device_data *data;
> + int err;
> +
> + amldev = devm_kzalloc(&serdev->dev, sizeof(*amldev), GFP_KERNEL);
> + if (!amldev)
> + return -ENOMEM;
> +
> + amldev->serdev_hu.serdev = serdev;
> + amldev->dev = &serdev->dev;
> + serdev_device_set_drvdata(serdev, amldev);
> +
> + amldev->pwrseq = devm_pwrseq_get(&serdev->dev, "bluetooth");
> + if (IS_ERR(amldev->pwrseq))
> + return dev_err_probe(amldev->dev, PTR_ERR(amldev->pwrseq),
> + "Failed to get pwrseq target");
> +
> + err = hci_uart_register_device(&amldev->serdev_hu, &aml_hci_proto);
> + if (err)
> + return dev_err_probe(amldev->dev, err,
> + "Failed to register hci uart device");
> +
> + data = device_get_match_data(&serdev->dev);
> + if (data) {
> + amldev->iccm_offset = data->iccm_offset;
> + amldev->dccm_offset = data->dccm_offset;
> + }
> +
> + return 0;
> +}
> +
> +static void aml_serdev_remove(struct serdev_device *serdev)
> +{
> + struct aml_serdev *amldev = serdev_device_get_drvdata(serdev);
> +
> + hci_uart_unregister_device(&amldev->serdev_hu);
> +}
> +
> +static const struct aml_device_data data_w155s2 __maybe_unused = {
> + .iccm_offset = 256 * 1024,
> +};
> +
> +static const struct aml_device_data data_w265s2 __maybe_unused = {
> + .iccm_offset = 384 * 1024,
> +};
> +
> +static const struct of_device_id aml_bluetooth_of_match[] = {
> + { .compatible = "amlogic,w155s2-bt", .data = &data_w155s2 },
> + { .compatible = "amlogic,w265s2-bt", .data = &data_w265s2 },
> + { /* sentinel */ },
> +};
> +
> +static struct serdev_device_driver aml_serdev_driver = {
> + .probe = aml_serdev_probe,
> + .remove = aml_serdev_remove,
> + .driver = {
> + .name = "hci_uart_aml",
> + .of_match_table = of_match_ptr(aml_bluetooth_of_match),
> + .shutdown = aml_device_driver_shutdown,
> + },
> +};
> +
> +int __init aml_init(void)
> +{
> + serdev_device_driver_register(&aml_serdev_driver);
> +
> + return hci_uart_register_proto(&aml_hci_proto);
> +}
> +
> +int __exit aml_deinit(void)
> +{
> + serdev_device_driver_unregister(&aml_serdev_driver);
> +
> + return hci_uart_unregister_proto(&aml_hci_proto);
> +}
> diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
> index 30192bb08354..d307c41a5470 100644
> --- a/drivers/bluetooth/hci_ldisc.c
> +++ b/drivers/bluetooth/hci_ldisc.c
> @@ -870,7 +870,9 @@ static int __init hci_uart_init(void)
> #ifdef CONFIG_BT_HCIUART_MRVL
> mrvl_init();
> #endif
> -
> +#ifdef CONFIG_BT_HCIUART_AML
> + aml_init();
> +#endif
> return 0;
> }
>
> @@ -906,7 +908,9 @@ static void __exit hci_uart_exit(void)
> #ifdef CONFIG_BT_HCIUART_MRVL
> mrvl_deinit();
> #endif
> -
> +#ifdef CONFIG_BT_HCIUART_AML
> + aml_deinit();
> +#endif
> tty_unregister_ldisc(&hci_uart_ldisc);
> }
>
> diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
> index 00bf7ae82c5b..fbf3079b92a5 100644
> --- a/drivers/bluetooth/hci_uart.h
> +++ b/drivers/bluetooth/hci_uart.h
> @@ -20,7 +20,7 @@
> #define HCIUARTGETFLAGS _IOR('U', 204, int)
>
> /* UART protocols */
> -#define HCI_UART_MAX_PROTO 12
> +#define HCI_UART_MAX_PROTO 13
>
> #define HCI_UART_H4 0
> #define HCI_UART_BCSP 1
> @@ -34,6 +34,7 @@
> #define HCI_UART_AG6XX 9
> #define HCI_UART_NOKIA 10
> #define HCI_UART_MRVL 11
> +#define HCI_UART_AML 12
>
> #define HCI_UART_RAW_DEVICE 0
> #define HCI_UART_RESET_ON_INIT 1
> @@ -209,3 +210,8 @@ int ag6xx_deinit(void);
> int mrvl_init(void);
> int mrvl_deinit(void);
> #endif
> +
> +#ifdef CONFIG_BT_HCIUART_AML
> +int aml_init(void);
> +int aml_deinit(void);
> +#endif
>
> --
> 2.42.0
>
>

--
Luiz Augusto von Dentz

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