src/devices/board/drivers/astro/astro-audio.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/binding.h>
#include <ddk/debug.h>
#include <ddk/device.h>
#include <ddk/platform-defs.h>
#include <ddk/protocol/platform/bus.h>
#include <soc/aml-meson/g12a-clk.h>
#include <soc/aml-s905d2/s905d2-gpio.h>
#include <soc/aml-s905d2/s905d2-hw.h>

#include "astro-gpios.h"
#include "astro.h"

namespace astro {

static const pbus_mmio_t audio_mmios[] = {
    {.base = S905D2_EE_AUDIO_BASE, .length = S905D2_EE_AUDIO_LENGTH},
};

static const pbus_bti_t tdm_btis[] = {
    {
        .iommu_index = 0,
        .bti_id = BTI_AUDIO_OUT,
    },
};

static pbus_dev_t tdm_dev = []() {
  pbus_dev_t dev = {};
  dev.name = "astro-audio-out";
  dev.vid = PDEV_VID_AMLOGIC;
  dev.pid = PDEV_PID_AMLOGIC_S905D2;
  dev.did = PDEV_DID_AMLOGIC_TDM;
  dev.mmio_list = audio_mmios;
  dev.mmio_count = countof(audio_mmios);
  dev.bti_list = tdm_btis;
  dev.bti_count = countof(tdm_btis);
  return dev;
}();

static const zx_bind_inst_t root_match[] = {
    BI_MATCH(),
};

static const zx_bind_inst_t i2c_match[] = {
    BI_ABORT_IF(NE, BIND_PROTOCOL, ZX_PROTOCOL_I2C),
    BI_ABORT_IF(NE, BIND_I2C_BUS_ID, ASTRO_I2C_3),
    BI_MATCH_IF(EQ, BIND_I2C_ADDRESS, I2C_AUDIO_CODEC_ADDR),
};

static const zx_bind_inst_t fault_gpio_match[] = {
    BI_ABORT_IF(NE, BIND_PROTOCOL, ZX_PROTOCOL_GPIO),
    BI_MATCH_IF(EQ, BIND_GPIO_PIN, GPIO_AUDIO_SOC_FAULT_L),
};

static const zx_bind_inst_t enable_gpio_match[] = {
    BI_ABORT_IF(NE, BIND_PROTOCOL, ZX_PROTOCOL_GPIO),
    BI_MATCH_IF(EQ, BIND_GPIO_PIN, GPIO_SOC_AUDIO_EN),
};

static const device_fragment_part_t i2c_fragment[] = {
    {countof(root_match), root_match},
    {countof(i2c_match), i2c_match},
};

static const device_fragment_part_t fault_gpio_fragment[] = {
    {countof(root_match), root_match},
    {countof(fault_gpio_match), fault_gpio_match},
};

static const device_fragment_part_t enable_gpio_fragment[] = {
    {countof(root_match), root_match},
    {countof(enable_gpio_match), enable_gpio_match},
};

static const device_fragment_t fragments[] = {
    {countof(i2c_fragment), i2c_fragment},
    {countof(fault_gpio_fragment), fault_gpio_fragment},
    {countof(enable_gpio_fragment), enable_gpio_fragment},
};

// PDM input configurations
static const pbus_mmio_t pdm_mmios[] = {
    {.base = S905D2_EE_PDM_BASE, .length = S905D2_EE_PDM_LENGTH},
    {.base = S905D2_EE_AUDIO_BASE, .length = S905D2_EE_AUDIO_LENGTH},
};

static const pbus_bti_t pdm_btis[] = {
    {
        .iommu_index = 0,
        .bti_id = BTI_AUDIO_IN,
    },
};

static const pbus_dev_t pdm_dev = []() {
  pbus_dev_t dev = {};
  dev.name = "astro-audio-in";
  dev.vid = PDEV_VID_AMLOGIC;
  dev.pid = PDEV_PID_AMLOGIC_S905D2;
  dev.did = PDEV_DID_AMLOGIC_PDM;
  dev.mmio_list = pdm_mmios;
  dev.mmio_count = countof(pdm_mmios);
  dev.bti_list = pdm_btis;
  dev.bti_count = countof(pdm_btis);
  return dev;
}();

zx_status_t Astro::AudioInit() {
  zx_status_t status;

  status = clk_impl_.Disable(g12a_clk::CLK_HIFI_PLL);
  if (status != ZX_OK) {
    zxlogf(ERROR, "%s: Disable(CLK_HIFI_PLL) failed, st = %d", __func__, status);
    return status;
  }

  status = clk_impl_.SetRate(g12a_clk::CLK_HIFI_PLL, 768000000);
  if (status != ZX_OK) {
    zxlogf(ERROR, "%s: SetRate(CLK_HIFI_PLL) failed, st = %d", __func__, status);
    return status;
  }

  status = clk_impl_.Enable(g12a_clk::CLK_HIFI_PLL);
  if (status != ZX_OK) {
    zxlogf(ERROR, "%s: Enable(CLK_HIFI_PLL) failed, st = %d", __func__, status);
    return status;
  }

  // TDM pin assignments
  gpio_impl_.SetAltFunction(S905D2_GPIOA(1), S905D2_GPIOA_1_TDMB_SCLK_FN);
  gpio_impl_.SetAltFunction(S905D2_GPIOA(2), S905D2_GPIOA_2_TDMB_FS_FN);
  gpio_impl_.SetAltFunction(S905D2_GPIOA(3), S905D2_GPIOA_3_TDMB_D0_FN);
  gpio_impl_.SetAltFunction(S905D2_GPIOA(6), S905D2_GPIOA_6_TDMB_DIN3_FN);
  constexpr uint8_t medium_strength = 2;  // Not mA, unitless values from AMLogic.
  gpio_impl_.SetDriveStrength(S905D2_GPIOA(1), medium_strength);
  gpio_impl_.SetDriveStrength(S905D2_GPIOA(2), medium_strength);
  gpio_impl_.SetDriveStrength(S905D2_GPIOA(3), medium_strength);

  // PDM pin assignments
  gpio_impl_.SetAltFunction(S905D2_GPIOA(7), S905D2_GPIOA_7_PDM_DCLK_FN);
  gpio_impl_.SetAltFunction(S905D2_GPIOA(8), S905D2_GPIOA_8_PDM_DIN0_FN);

  gpio_impl_.ConfigOut(S905D2_GPIOA(5), 1);

  status = pbus_.CompositeDeviceAdd(&tdm_dev, fragments, countof(fragments), UINT32_MAX);
  if (status != ZX_OK) {
    zxlogf(ERROR, "%s: CompositeDeviceAdd failed: %d", __func__, status);
    return status;
  }

  status = pbus_.DeviceAdd(&pdm_dev);
  if (status != ZX_OK) {
    zxlogf(ERROR, "%s: DeviceAdd failed: %d", __func__, status);
    return status;
  }

  return ZX_OK;
}

}  // namespace astro