pcie_driver/api/SonoPcieDevice.cpp

#include "SonoPcieDevice.h"

#include <sys/mman.h>
#include <fcntl.h>

SonoPcieDevice::SonoPcieDevice()
{
  bars[0].size = 32 MB;
  bars[1].size = 16 MB;
  bars[2].size = 16 KB;

  for(auto i = 0; i < TOTAL_DMA_BUFFER_NUM; i++)
  {
    dmaBuffers[i].size = DMA_SIZE;
  }
}

void SonoPcieDevice::init()
{
  initBars();

  initDmaBuffers();
}

void SonoPcieDevice::initBars()
{
  int fd = open("/proc/sono_bars", O_RDWR | O_SYNC);
  if(fd == -1)
  {
    SonoException exp("Could not open bar proc file");
    throw exp;
  }

  for(auto i = 0; i < TOTAL_BAR_NUM; i++)
  {  
    bars[i].ptr = mmap(0, bars[i].size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, i << 12); 
  }
}

void SonoPcieDevice::initDmaBuffers()
{
  int fd = open("/proc/sono_buffers", O_RDWR | O_SYNC);
  if(fd == -1)
  {
    SonoException exp("Could not open buffers proc file");
    throw exp;
  }

  for(auto i = 0; i < TOTAL_DMA_BUFFER_NUM; i++)
  {
    dmaBuffers[i].ptr = mmap(0, dmaBuffers[i].size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, i << 12); 
  }
}

  void SonoPcieDevice::writeByte(uint32_t bar, uint32_t offset, uint8_t data)
  {
    uint8_t* temp = (uint8_t*)bars[bar].ptr;
    temp[offset] = data;
  }

  void SonoPcieDevice::writeShort(uint32_t bar, uint32_t offset, uint16_t data)
  {
    uint16_t* temp = (uint16_t*)bars[bar].ptr;
    temp[offset / 2] = data;
  }

  void SonoPcieDevice::writeWord(uint32_t bar, uint32_t offset, uint32_t data)
  {
    uint32_t* temp = (uint32_t*)bars[bar].ptr;
    temp[offset / 4] = data;
  }

  void SonoPcieDevice::writeLong(uint32_t bar, uint32_t offset, uint64_t data)
  {
    uint64_t* temp = (uint64_t*)bars[bar].ptr;
    temp[offset / 8] = data;
  }

  uint8_t SonoPcieDevice::readByte(uint32_t bar, uint32_t offset)
  {
    uint8_t* temp = (uint8_t*)bars[bar].ptr;
    return temp[offset];
  }

  uint16_t SonoPcieDevice::readShort(uint32_t bar, uint32_t offset)
  {
    uint16_t* temp = (uint16_t*)bars[bar].ptr;
    return temp[offset / 2];
  }

  uint32_t SonoPcieDevice::readWord(uint32_t bar, uint32_t offset)
  {
    uint32_t* temp = (uint32_t*)bars[bar].ptr;
    return temp[offset / 4];
  }

  uint64_t SonoPcieDevice::readLong(uint32_t bar, uint32_t offset)
  {
    uint64_t* temp = (uint64_t*)bars[bar].ptr;
    return temp[offset / 8];
  }

  uint8_t* SonoPcieDevice::getBufferPtr(uint32_t buffer)
  {
    return (uint8_t*)dmaBuffers[buffer].ptr;
  }