src/devices/board/drivers/sherlock/sherlock-i2c.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 <fuchsia/hardware/gpioimpl/cpp/banjo.h>
#include <fuchsia/hardware/platform/bus/c/banjo.h>
#include <lib/ddk/debug.h>
#include <lib/ddk/device.h>
#include <lib/ddk/metadata.h>
#include <lib/ddk/platform-defs.h>

#include <soc/aml-t931/t931-gpio.h>
#include <soc/aml-t931/t931-hw.h>

#include "sherlock.h"
#include "src/devices/lib/fidl-metadata/i2c.h"

namespace sherlock {

using i2c_channel_t = fidl_metadata::i2c::Channel;

static const pbus_mmio_t i2c_mmios[] = {
    {
        .base = T931_I2C_AOBUS_BASE,
        .length = 0x20,
    },
    {
        .base = T931_I2C2_BASE,
        .length = 0x20,
    },
    {
        .base = T931_I2C3_BASE,
        .length = 0x20,
    },
};

static const uint32_t luis_i2c_clock_delays[] = {
    0,    // Ignore I2C AO
    104,  // Set I2C 2 (touch) to 400 kHz
    0,    // Ignore I2C 3
};

static const pbus_irq_t i2c_irqs[] = {
    {
        .irq = T931_I2C_AO_0_IRQ,
        .mode = ZX_INTERRUPT_MODE_EDGE_HIGH,
    },
    {
        .irq = T931_I2C2_IRQ,
        .mode = ZX_INTERRUPT_MODE_EDGE_HIGH,
    },
    {
        .irq = T931_I2C3_IRQ,
        .mode = ZX_INTERRUPT_MODE_EDGE_HIGH,
    },
};

static const i2c_channel_t luis_ernie_i2c_channels[] = {
    // Backlight I2C
    {
        .bus_id = SHERLOCK_I2C_3,
        .address = 0x2C,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // Touch screen I2C
    {
        .bus_id = SHERLOCK_I2C_2,
        .address = 0x40,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // Codec 0
    {
        .bus_id = SHERLOCK_I2C_A0_0,
        .address = 0x4c,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // IMX355 Camera Sensor
    {
        .bus_id = SHERLOCK_I2C_3,
        .address = 0x1a,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // Light Sensor
    {
        .bus_id = SHERLOCK_I2C_A0_0,
        .address = 0x39,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // IMX355 Camera EEPROM
    {
        .bus_id = SHERLOCK_I2C_3,
        .address = 0x51,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // 0P8_EE_BUCK - platform
    {
        .bus_id = SHERLOCK_I2C_A0_0,
        .address = 0x60,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // CPU_A_BUCK - platform
    {
        .bus_id = SHERLOCK_I2C_3,
        .address = 0x60,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // 0P8_EE_BUCK - form factor
    {
        .bus_id = SHERLOCK_I2C_A0_0,
        .address = 0x6a,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // CPU_A_BUCK - form factor
    {
        .bus_id = SHERLOCK_I2C_A0_0,
        .address = 0x69,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // Codec 1
    {
        .bus_id = SHERLOCK_I2C_A0_0,
        .address = 0x2d,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
};

static const i2c_channel_t sherlock_i2c_channels[] = {
    // Backlight I2C
    {
        .bus_id = SHERLOCK_I2C_3,
        .address = 0x2C,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // Touch screen I2C
    {
        .bus_id = SHERLOCK_I2C_2,
        .address = 0x38,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // Tweeter left
    {
        .bus_id = SHERLOCK_I2C_A0_0,
        .address = 0x6c,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // Tweeter right
    {
        .bus_id = SHERLOCK_I2C_A0_0,
        .address = 0x6d,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // Woofer
    {
        .bus_id = SHERLOCK_I2C_A0_0,
        .address = 0x6f,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // IMX227 Camera Sensor
    {
        .bus_id = SHERLOCK_I2C_3,
        .address = 0x36,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
    // Light Sensor
    {
        .bus_id = SHERLOCK_I2C_A0_0,
        .address = 0x39,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },

    // LCD Bias
    {
        .bus_id = SHERLOCK_I2C_3,
        .address = 0X3E,
        .vid = 0,
        .pid = 0,
        .did = 0,
    },
};

zx_status_t Sherlock::I2cInit() {
  // setup pinmux for our I2C busses
  // i2c_ao_0
  gpio_impl_.SetAltFunction(T931_GPIOAO(2), 1);
  gpio_impl_.SetAltFunction(T931_GPIOAO(3), 1);
  if (pid_ == PDEV_PID_LUIS) {
    gpio_impl_.SetDriveStrength(T931_GPIOAO(2), 3000, nullptr);
    gpio_impl_.SetDriveStrength(T931_GPIOAO(3), 3000, nullptr);
  }
  // i2c2
  gpio_impl_.SetAltFunction(T931_GPIOZ(14), 3);
  gpio_impl_.SetAltFunction(T931_GPIOZ(15), 3);
  // i2c3
  gpio_impl_.SetAltFunction(T931_GPIOA(14), 2);
  gpio_impl_.SetAltFunction(T931_GPIOA(15), 2);

  pbus_dev_t dev = {};
  dev.name = "gpio";
  dev.vid = PDEV_VID_AMLOGIC;
  dev.pid = PDEV_PID_GENERIC;
  dev.did = PDEV_DID_AMLOGIC_I2C;
  dev.mmio_list = i2c_mmios;
  dev.mmio_count = countof(i2c_mmios);
  dev.irq_list = i2c_irqs;
  dev.irq_count = countof(i2c_irqs);

  const i2c_channel_t* channels;
  size_t channel_count;
  std::vector<pbus_metadata_t> metadata;
  if (pid_ == PDEV_PID_SHERLOCK) {
    channels = sherlock_i2c_channels;
    channel_count = countof(sherlock_i2c_channels);
  } else {
    channels = luis_ernie_i2c_channels;
    channel_count = countof(luis_ernie_i2c_channels);
    metadata.emplace_back(pbus_metadata_t{
        .type = DEVICE_METADATA_PRIVATE,
        .data_buffer = reinterpret_cast<const uint8_t*>(&luis_i2c_clock_delays),
        .data_size = sizeof(luis_i2c_clock_delays),
    });
  };

  auto i2c_status = fidl_metadata::i2c::I2CChannelsToFidl(
      cpp20::span<const i2c_channel_t>(channels, channel_count));
  if (i2c_status.is_error()) {
    zxlogf(ERROR, "%s: failed to fidl encode i2c channels: %d", __func__, i2c_status.error_value());
    return i2c_status.error_value();
  }

  auto& data = i2c_status.value();

  metadata.emplace_back(pbus_metadata_t{
      .type = DEVICE_METADATA_I2C_CHANNELS,
      .data_buffer = data.data(),
      .data_size = data.size(),
  });

  dev.metadata_count = metadata.size();
  dev.metadata_list = metadata.data();

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

  return ZX_OK;
}

}  // namespace sherlock