zircon/system/dev/board/astro/astro-bluetooth.cc

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <ddk/debug.h>
#include <ddk/metadata.h>
#include <ddk/platform-defs.h>
#include <ddk/protocol/gpioimpl.h>
#include <ddk/protocol/platform/bus.h>
#include <ddk/protocol/serial.h>
#include <fuchsia/hardware/serial/c/fidl.h>
#include <hw/reg.h>
#include <lib/mmio/mmio.h>
#include <soc/aml-s905d2/s905d2-gpio.h>
#include <soc/aml-s905d2/s905d2-hw.h>
#include <unistd.h>

#include "astro.h"

namespace astro {

#define SOC_WIFI_LPO_32k768 S905D2_GPIOX(16)
#define SOC_BT_REG_ON       S905D2_GPIOX(17)

static const pbus_mmio_t bt_uart_mmios[] = {
    {
        .base = S905D2_UART_A_BASE,
        .length = S905D2_UART_A_LENGTH,
    },
};

static const pbus_irq_t bt_uart_irqs[] = {
    {
        .irq = S905D2_UART_A_IRQ,
        .mode = ZX_INTERRUPT_MODE_EDGE_HIGH,
    },
};

static const serial_port_info_t bt_uart_serial_info = {
    .serial_class = fuchsia_hardware_serial_Class_BLUETOOTH_HCI,
    .serial_vid = PDEV_VID_BROADCOM,
    .serial_pid = PDEV_PID_BCM43458,
};

static const pbus_metadata_t bt_uart_metadata[] = {
    {
        .type = DEVICE_METADATA_SERIAL_PORT_INFO,
        .data_buffer = &bt_uart_serial_info,
        .data_size = sizeof(bt_uart_serial_info),
    },
};

static const pbus_boot_metadata_t bt_uart_boot_metadata[] = {
    {
        .zbi_type = DEVICE_METADATA_MAC_ADDRESS,
        .zbi_extra = MACADDR_BLUETOOTH,
    },
};

static pbus_dev_t bt_uart_dev = []() {
    pbus_dev_t dev;
    dev.name = "bt-uart";
    dev.vid = PDEV_VID_AMLOGIC;
    dev.pid = PDEV_PID_GENERIC;
    dev.did = PDEV_DID_AMLOGIC_UART;
    dev.mmio_list = bt_uart_mmios;
    dev.mmio_count = countof(bt_uart_mmios);
    dev.irq_list = bt_uart_irqs;
    dev.irq_count = countof(bt_uart_irqs);
    dev.metadata_list = bt_uart_metadata;
    dev.metadata_count = countof(bt_uart_metadata);
    dev.boot_metadata_list = bt_uart_boot_metadata;
    dev.boot_metadata_count = countof(bt_uart_boot_metadata);
    return dev;
}();

// Enables and configures PWM_E on the SOC_WIFI_LPO_32k768 line for the
// Wifi/Bluetooth module
zx_status_t Astro::EnableWifi32K() {
    // Configure SOC_WIFI_LPO_32k768 pin for PWM_E
    zx_status_t status = gpio_impl_.SetAltFunction(SOC_WIFI_LPO_32k768, 1);
    if (status != ZX_OK) {
        return status;
    }

    zx::bti bti;
    status = iommu_.GetBti(BTI_BOARD, 0, &bti);
    if (status != ZX_OK) {
        zxlogf(ERROR, "%s: GetBti failed: %d\n", __func__, status);
        return status;
    }

    std::optional<ddk::MmioBuffer> pwm_base;

    // Please do not use get_root_resource() in new code. See ZX-1467.
    zx::unowned_resource resource(get_root_resource());
    status = ddk::MmioBuffer::Create(S905D2_PWM_BASE, 0x1a000,
                                     *resource,
                                     ZX_CACHE_POLICY_UNCACHED_DEVICE,
                                     &pwm_base);
    if (status != ZX_OK) {
        zxlogf(ERROR, "%s: Create(pwm_base) error: %d\n",
               __func__, status);
    }
    // these magic numbers were gleaned by instrumenting
    // drivers/amlogic/pwm/pwm_meson.c
    // TODO(voydanoff) write a proper PWM driver
    pwm_base->Write32(0x016d016e, S905D2_PWM_PWM_E << 2);
    pwm_base->Write32(0x016d016d, S905D2_PWM_E2 << 2);
    pwm_base->Write32(0x0a0a0609, S905D2_PWM_TIME_EF << 2);
    pwm_base->Write32(0x02808003, S905D2_PWM_MISC_REG_EF << 2);

    return ZX_OK;
}

zx_status_t Astro::BluetoothInit() {
    zx_status_t status;

    // set alternate functions to enable Bluetooth UART
    status = gpio_impl_.SetAltFunction(S905D2_UART_TX_A, S905D2_UART_TX_A_FN);
    if (status != ZX_OK) {
        return status;
    }

    status = gpio_impl_.SetAltFunction(S905D2_UART_RX_A, S905D2_UART_RX_A_FN);
    if (status != ZX_OK) {
        return status;
    }

    status = gpio_impl_.SetAltFunction(S905D2_UART_CTS_A, S905D2_UART_CTS_A_FN);
    if (status != ZX_OK) {
        return status;
    }

    status = gpio_impl_.SetAltFunction(S905D2_UART_RTS_A, S905D2_UART_RTS_A_FN);
    if (status != ZX_OK) {
        return status;
    }

    // Configure the SOC_WIFI_LPO_32k768 PWM, which is needed for the
    // Bluetooth module to work properly
    status = EnableWifi32K();
    if (status != ZX_OK) {
        return status;
    }

    // set GPIO to reset Bluetooth module
    gpio_impl_.ConfigOut(SOC_BT_REG_ON, 0);
    usleep(10 * 1000);
    gpio_impl_.Write(SOC_BT_REG_ON, 1);
    usleep(100 * 1000);

    // Bind UART for Bluetooth HCI
    status = pbus_.DeviceAdd(&bt_uart_dev);
    if (status != ZX_OK) {
        zxlogf(ERROR, "%s: DeviceAdd failed: %d\n", __func__, status);
        return status;
    }

    return ZX_OK;
}

} // namespace astro