Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* cable_usbblaster.c - Altera USB Blaster driver for the Advanced JTAG Bridge

   Copyright (C) 2008 - 2010 Nathan Yawn, nathan.yawn@opencores.org

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>  // for usleep()

#include <stdlib.h>  // for sleep()

#include <arpa/inet.h> // for htons()

#include <string.h>  // for memcpy()

#include "usb.h"  // libusb header

#include "cable_common.h"

#include "errcodes.h"

#define debug(...) //fprintf(stderr, __VA_ARGS__ )

// USB constants for the USB Blaster

// Valid endpoints: 0x81, 0x02, 0x06, 0x88

#define EP2        0x02

#define EP1        0x81

#define ALTERA_VID 0x09FB

#define ALTERA_PID 0x6001

//#define USB_TIMEOUT 500

#define USB_TIMEOUT 10000

// Bit meanings in the command byte sent to the USB-Blaster

#define USBBLASTER_CMD_TCK 0x01

#define USBBLASTER_CMD_TMS 0x02

#define USBBLASTER_CMD_nCE 0x04  /* should be left low */

#define USBBLASTER_CMD_nCS 0x08  /* must be set for byte-shift mode reads to work */

#define USBBLASTER_CMD_TDI 0x10

#define USBBLASTER_CMD_OE  0x20  /* appears necessary to set it to make everything work */

#define USBBLASTER_CMD_READ 0x40

#define USBBLASTER_CMD_BYTESHIFT 0x80

static struct usb_device *usbblaster_device;

static usb_dev_handle *h_device;

// libusb seems to give an error if we ask for a transfer larger than 64 bytes

// USBBlaster also has a max. single transaction of 63 bytes.

// So, size the max read and write to create 64-byte USB packets (reads have 2 useless bytes prepended)

#define USBBLASTER_MAX_WRITE 63

static char data_out_scratchpad[USBBLASTER_MAX_WRITE+1];

#define USBBLASTER_MAX_READ  62

static char data_in_scratchpad[USBBLASTER_MAX_READ+2];

int cable_usbblaster_open_cable(void);

void cable_usbblaster_close_cable(void);

//int cable_usbblaster_reopen_cable(void);

///////////////////////////////////////////////////////////////////////////////

/*-------------------------------------[ USB Blaster specific functions ]---*/

/////////////////////////////////////////////////////////////////////////////

static int usbblaster_start_interface(struct usb_dev_handle *xpcu)

{

  // Need to send a VENDOR request OUT, request = GET_STATUS

  // Other parameters are ignored

  if(usb_control_msg(xpcu, (USB_ENDPOINT_OUT | USB_TYPE_VENDOR), USB_REQ_GET_STATUS,

                     0, 0, NULL, 0, 1000)<0)

    {

      perror("usb_control_msg(start interface)");

      return APP_ERR_USB;

    }

  return APP_ERR_NONE;

}

static int usbblaster_read_firmware_version(struct usb_dev_handle *xpcu, uint16_t *buf)

{

  if(usb_control_msg(xpcu, 0xC0, 0x90, 0, 3, (char*)buf, 2, USB_TIMEOUT)<0)

    {

      perror("usb_control_msg(0x90.0) (read_firmware_version)");

      return APP_ERR_USB;

    }

  // Swap endian

  *buf = htons(*buf);

  //*buf = (*buf << 8) | (*buf >> 8);

  return APP_ERR_NONE;

}

static int usbblaster_enumerate_bus(void)

{

  int             flag;  // for USB bus scanning stop condition

  struct usb_bus *bus;   // pointer on the USB bus

  // board detection

  usb_init();

  usb_find_busses();

  usb_find_devices();

  flag = 0;

  for (bus = usb_get_busses(); bus; bus = bus->next)

  {

    for (usbblaster_device = bus->devices; usbblaster_device; usbblaster_device = usbblaster_device->next)

    {

      if (usbblaster_device->descriptor.idVendor  == ALTERA_VID &&

          usbblaster_device->descriptor.idProduct == ALTERA_PID)

      {

              flag = 1;

              fprintf(stderr, "Found Altera USB-Blaster\n");

              return APP_ERR_NONE;

      }

    }

    if (flag)

      break;

  }

  fprintf(stderr, "Failed to find USB-Blaster\n");

  return APP_ERR_CABLENOTFOUND;

}

int cable_usbblaster_init(){

  int err = APP_ERR_NONE;

  // Process to reset the usb blaster

  if(err |= usbblaster_enumerate_bus()) {

    return err;

  }

  h_device = usb_open(usbblaster_device);

  if(h_device == NULL)

    {

      fprintf(stderr, "Init failed to open USB device for reset\n");

      return APP_ERR_USB;

    }

  if(usb_reset(h_device) != APP_ERR_NONE)

    fprintf(stderr, "Failed to reset USB Blaster\n");

  usb_close(h_device);

  // Wait for reset!!!

  sleep(1);

  // Do device initialization

  if(err |= usbblaster_enumerate_bus())

    return err;

  err = cable_usbblaster_open_cable();

  if(err != APP_ERR_NONE) return err;

  //usb_clear_halt(h_device, EP1);

  //usb_clear_halt(h_device, EP2);

  // IMPORTANT:  DO NOT SEND A REQUEST TYPE "CLASS" OR TYPE "RESERVED".  This may stall the EP.

  // Some clones need this before they will start processing IN/OUT requests

  if(usbblaster_start_interface(h_device) != APP_ERR_NONE)

    fprintf(stderr, "Failed to start remote interface\n");

  uint16_t buf;

  if(err |= usbblaster_read_firmware_version(h_device, &buf))

    {

      usb_close(h_device);

      fprintf(stderr, "Failed to read firmware version\n");

      return err;

    }

  else

    {

      printf("firmware version = 0x%04X (%u)\n", buf, buf);

    }

  // USB blaster is expecting us to read 2 bytes, which are useless to us...

  char ret[2];

  int rv = usb_bulk_read(h_device, EP1, ret, 2, USB_TIMEOUT);

  if (rv < 0){  // But if we fail, who cares?

    fprintf(stderr, "\nWarning: Failed to read post-init bytes from the EP1 FIFO (%i):\n%s", rv, usb_strerror());

  }

  return APP_ERR_NONE;

}

int cable_usbblaster_out(uint8_t value)

{

  int             rv;                  // to catch return values of functions

  char out;

  int err = APP_ERR_NONE;

  // open the device, if necessary

  if(h_device == NULL) {

    rv = cable_usbblaster_open_cable();

    if(rv != APP_ERR_NONE) return rv;

  }

  out = (USBBLASTER_CMD_OE | USBBLASTER_CMD_nCS);  // Set output enable (appears necessary) and nCS (necessary for byte-shift reads)

  // Translate to USB blaster protocol

  // USB-Blaster has no TRST pin

  if(value & TCLK_BIT)

    out |= USBBLASTER_CMD_TCK;

  if(value & TDI_BIT)

    out |= USBBLASTER_CMD_TDI;

  if(value & TMS_BIT)

    out |= USBBLASTER_CMD_TMS;

  rv = usb_bulk_write(h_device, EP2, &out, 1, USB_TIMEOUT);

  if (rv != 1){

    fprintf(stderr, "\nFailed to write to the FIFO (rv = %d):\n%s", rv, usb_strerror());

    err |= APP_ERR_USB;

  }

  return err;

}

int cable_usbblaster_inout(uint8_t value, uint8_t *in_bit)

{

  int             rv;                  // to catch return values of functions

  char ret[3] = {0,0,0};               // Two useless bytes (0x31,0x60) always precede the useful byte

  char out;

  out = (USBBLASTER_CMD_OE | USBBLASTER_CMD_nCS);  // Set output enable (?) and nCS (necessary for byte-shift reads)

  out |=  USBBLASTER_CMD_READ;

  // Translate to USB blaster protocol

  // USB-Blaster has no TRST pin

  if(value & TCLK_BIT)

    out |= USBBLASTER_CMD_TCK;

  if(value & TDI_BIT)

    out |= USBBLASTER_CMD_TDI;

  if(value & TMS_BIT)

    out |= USBBLASTER_CMD_TMS;

  // open the device, if necessary

  if(h_device == NULL) {

    rv = cable_usbblaster_open_cable();

    if(rv != APP_ERR_NONE) return rv;

  }

  // Send a read request

  rv = usb_bulk_write(h_device, EP2, &out, 1, USB_TIMEOUT);

  if (rv != 1){

    fprintf(stderr, "\nFailed to write a read request to the EP2 FIFO:\n%s", usb_strerror());

    cable_usbblaster_close_cable();

    return APP_ERR_USB;

  }

  // receive the response

  // Sometimes, we do a read but just get the useless 0x31,0x60 chars...

  // retry until we get a 3rd byte (with real data), for a reasonable number of retries.

  int retries = 0;

  do {

    rv = usb_bulk_read(h_device, EP1, ret, 3, USB_TIMEOUT);

    if (rv < 0){

      fprintf(stderr, "\nFailed to read from the EP1 FIFO (%i):\n%s", rv, usb_strerror());

      cable_usbblaster_close_cable();

      return APP_ERR_USB;

    }

    // fprintf(stderr, "Read %i bytes: 0x%X, 0x%X, 0x%X\n", rv, ret[0], ret[1], ret[2]);

    retries++;

  }

  while((rv < 3) && (retries < 20));

  *in_bit = (ret[2] & 0x01); /* TDO is bit 0.  USB-Blaster may also set bit 1. */

  return APP_ERR_NONE;

}

// The usbblaster transfers the bits in the stream in the following order:

// bit 0 of the first byte received ... bit 7 of the first byte received

// bit 0 of second byte received ... etc.

int cable_usbblaster_write_stream(uint32_t *stream, int len_bits, int set_last_bit) {

  int             rv;                  // to catch return values of functions

  unsigned int bytes_to_transfer, leftover_bit_length;

  uint32_t leftover_bits;

  int bytes_remaining;

  char *xfer_ptr;

  int err = APP_ERR_NONE;

  debug("cable_usbblaster_write_stream(0x%X, %d, %i)\n", stream, len, set_last_bit);

  // This routine must transfer at least 8 bits.  Additionally, TMS (the last bit)

  // cannot be set by 'byte shift mode'.  So we need at least 8 bits to transfer,

  // plus one bit to send along with TMS.

  bytes_to_transfer = len_bits / 8;

  leftover_bit_length = len_bits - (bytes_to_transfer * 8);

  if((!leftover_bit_length) && set_last_bit) {

    bytes_to_transfer -= 1;

    leftover_bit_length += 8;

  }

  debug("bytes_to_transfer: %d. leftover_bit_length: %d\n", bytes_to_transfer, leftover_bit_length);

  // Not enough bits for high-speed transfer. bit-bang.

  if(bytes_to_transfer == 0) {

    return cable_common_write_stream(stream, len_bits, set_last_bit);

  }

  // Bitbang functions leave clock high.  USBBlaster assumes clock low at the start of a burst.

  err |= cable_usbblaster_out(0);  // Lower the clock.

  // Set leftover bits

  leftover_bits = (stream[bytes_to_transfer>>2] >> ((bytes_to_transfer & 0x3) * 8)) & 0xFF;

  debug("leftover_bits: 0x%X, LSB_first_xfer = %d\n", leftover_bits, LSB_first_xfer);

  // open the device, if necessary

  if(h_device == NULL) {

    rv = cable_usbblaster_open_cable();

    if(rv != APP_ERR_NONE) return rv;

  }

  bytes_remaining = bytes_to_transfer;

  xfer_ptr = (char *) stream;

  while(bytes_remaining > 0)

    {

      int bytes_this_xfer = (bytes_remaining > USBBLASTER_MAX_WRITE) ? USBBLASTER_MAX_WRITE:bytes_remaining;

      data_out_scratchpad[0] = USBBLASTER_CMD_BYTESHIFT | (bytes_this_xfer & 0x3F);

      memcpy(&data_out_scratchpad[1], xfer_ptr, bytes_this_xfer);

      /* printf("Data packet: ");

         for(i = 0; i <= bytes_to_transfer; i++)

         printf("0x%X ", out[i]);

         printf("\n"); */

      rv = usb_bulk_write(h_device, EP2, data_out_scratchpad, bytes_this_xfer+1, USB_TIMEOUT);

      if (rv != (bytes_this_xfer+1)){

        fprintf(stderr, "\nFailed to write to the FIFO (rv = %d):\n%s", rv, usb_strerror());

        err |= APP_ERR_USB;

        break;

      }

      bytes_remaining -= bytes_this_xfer;

      xfer_ptr += bytes_this_xfer;

    }

  // if we have a number of bits not divisible by 8, or we need to set TMS...

  if(leftover_bit_length != 0) {

    //printf("Doing leftovers: (0x%X, %d, %d)\n", leftover_bits, leftover_bit_length, set_last_bit);

    return cable_common_write_stream(&leftover_bits, leftover_bit_length, set_last_bit);

  }

  return err;

}

int cable_usbblaster_read_stream(uint32_t *outstream, uint32_t *instream, int len_bits, int set_last_bit) {

  int             rv;                  // to catch return values of functions

  unsigned int bytes_received = 0, total_bytes_received = 0;

  unsigned int bytes_to_transfer, leftover_bit_length;

  uint32_t leftover_bits, leftovers_received = 0;

  unsigned char i;

  int bytes_remaining;

  char *xfer_ptr;

  int retval = APP_ERR_NONE;

  debug("cable_usbblaster_read_stream(0x%X, %d, %i)\n", outstream[0], len_bits, set_last_bit);

  // This routine must transfer at least 8 bits.  Additionally, TMS (the last bit)

  // cannot be set by 'byte shift mode'.  So we need at least 8 bits to transfer,

  // plus one bit to send along with TMS.

  bytes_to_transfer = len_bits / 8;

  leftover_bit_length = len_bits - (bytes_to_transfer * 8);

  if((!leftover_bit_length) && set_last_bit) {

    bytes_to_transfer -= 1;

    leftover_bit_length += 8;

  }

  debug("RD bytes_to_transfer: %d. leftover_bit_length: %d\n", bytes_to_transfer, leftover_bit_length);

  // Not enough bits for high-speed transfer. bit-bang.

  if(bytes_to_transfer == 0) {

    return cable_common_read_stream(outstream, instream, len_bits, set_last_bit);

  }

  // Bitbang functions leave clock high.  USBBlaster assumes clock low at the start of a burst.

  // Lower the clock.

  retval |= cable_usbblaster_out(0);

  // Zero the input, since we add new data by logical-OR

  for(i = 0; i < (len_bits/32); i++)  instream[i] = 0;

  if(len_bits % 32)                   instream[i] = 0;

  // Set leftover bits

  leftover_bits = (outstream[bytes_to_transfer>>2] >> ((bytes_to_transfer & 0x3) * 8)) & 0xFF;

  debug("leftover_bits: 0x%X\n", leftover_bits);

  // open the device, if necessary

  if(h_device == NULL) {

    rv = cable_usbblaster_open_cable();

    if(rv != APP_ERR_NONE) return rv;

  }

  // Transfer the data.  USBBlaster has a max transfer size of 64 bytes.

  bytes_remaining = bytes_to_transfer;

  xfer_ptr = (char *) outstream;

  total_bytes_received = 0;

  while(bytes_remaining > 0)

    {

      int bytes_this_xfer = (bytes_remaining > USBBLASTER_MAX_READ) ? USBBLASTER_MAX_READ:bytes_remaining;

      data_out_scratchpad[0] = USBBLASTER_CMD_BYTESHIFT | USBBLASTER_CMD_READ | (bytes_this_xfer & 0x3F);

      memcpy(&data_out_scratchpad[1], xfer_ptr, bytes_this_xfer);

      /* debug("Data packet: ");

         for(i = 0; i <= bytes_to_transfer; i++) debug("0x%X ", data_out_scratchpad[i]);

         debug("\n"); */

      rv = usb_bulk_write(h_device, EP2, data_out_scratchpad, bytes_this_xfer+1, USB_TIMEOUT);

      if (rv != (bytes_this_xfer+1)){

        fprintf(stderr, "\nFailed to write to the EP2 FIFO (rv = %d):\n%s", rv, usb_strerror());

        cable_usbblaster_close_cable();

        return APP_ERR_USB;

      }

      // receive the response

      // Sometimes, we do a read but just get the useless 0x31,0x60 chars...

      // retry until we get at least 3 bytes (with real data), for a reasonable number of retries.

      int retries = 0;

      bytes_received = 0;

      do {

        debug("stream read, bytes_this_xfer = %i, bytes_received = %i\n", bytes_this_xfer, bytes_received);

        rv = usb_bulk_read(h_device, EP1, data_in_scratchpad, (bytes_this_xfer-bytes_received)+2, USB_TIMEOUT);

        if (rv < 0){

          fprintf(stderr, "\nFailed to read stream from the EP1 FIFO (%i):\n%s", rv, usb_strerror());

          cable_usbblaster_close_cable();

          return APP_ERR_USB;

        }

        /* debug("Read %i bytes: ", rv);

           for(i = 0; i < rv; i++)

           debug("0x%X ", data_in_scratchpad[i]);

           debug("\n"); */

        if(rv > 2) retries = 0;

        else retries++;

        /* Put the received bytes into the return stream.  Works for either endian. */

        for(i = 0; i < (rv-2); i++) {

          // Do size/type promotion before shift.  Must cast to unsigned, else the value may be

          // sign-extended through the upper 16 bits of the uint32_t.

          uint32_t tmp = (unsigned char) data_in_scratchpad[2+i];

          instream[(total_bytes_received+i)>>2] |= (tmp << ((i & 0x3)*8));

        }

        bytes_received += (rv-2);

        total_bytes_received += (rv-2);

      }

      while((bytes_received < bytes_this_xfer) && (retries < 15));

      bytes_remaining -= bytes_this_xfer;

      xfer_ptr += bytes_this_xfer;

    }

  // if we have a number of bits not divisible by 8

  if(leftover_bit_length != 0) {

    debug("Doing leftovers: (0x%X, %d, %d)\n", leftover_bits, leftover_bit_length, set_last_bit);

    retval |= cable_common_read_stream(&leftover_bits, &leftovers_received, leftover_bit_length, set_last_bit);

    instream[bytes_to_transfer>>2] |= (leftovers_received & 0xFF) << (8*(bytes_to_transfer & 0x3));

  }

  return retval;

}

int cable_usbblaster_opt(int c, char *str)

{

  fprintf(stderr, "Unknown parameter '%c'\n", c);

  return APP_ERR_BAD_PARAM;

}

int cable_usbblaster_open_cable(void)

{

  // open the device

  h_device = usb_open(usbblaster_device);

  if (h_device == NULL){

        fprintf(stderr, "USBBlaster driver failed to open device\n");

        return APP_ERR_USB;

  }

  // set the configuration

  if (usb_set_configuration(h_device, usbblaster_device->config->bConfigurationValue))

  {

        usb_close(h_device);

        h_device = NULL;

        fprintf(stderr, "USBBlaster driver failed to set configuration\n");

        return APP_ERR_USB;

  }

  // wait until device is ready

  // *** TODO: add timeout

  while (usb_claim_interface(h_device, usbblaster_device->config->interface->altsetting->bInterfaceNumber));

  return APP_ERR_NONE;

}

void cable_usbblaster_close_cable(void)

{

  if(h_device != NULL) {

    // release the interface cleanly

    if (usb_release_interface(h_device, usbblaster_device->config->interface->altsetting->bInterfaceNumber)){

      fprintf(stderr, "Warning: failed to release usb interface\n");

    }

    // close the device

    usb_close(h_device);

    h_device = NULL;

  }

  return;

}

/*

int cable_usbblaster_reopen_cable(void)

{

  cable_usbblaster_close_cable();

  return cable_usbblaster_open_cable();

}

*/