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// Program that will erase and program an SPI flash

#include "or32-utils.h"

#include "spr-defs.h"

#include "board.h"

#include "uart.h"

#include "simple-spi.h"

#include "printf.h"

unsigned long programming_file_start;

unsigned long programming_file_end;

unsigned long programming_file_length;

int spi_master;

char slave;

// Little program to dump the contents of the SPI flash memory it's connected 

// to on the board

void

spi_write_ignore_read(int core, char dat)

{

  spi_core_write_data(core,dat);

  while (!(spi_core_data_avail(core))); // Wait for the transaction (should 

                                        // generate a byte)

  spi_core_read_data(core);

}

char

spi_read_ignore_write(int core)

{

  spi_core_write_data(core, 0x00);

  while (!(spi_core_data_avail(core))); // Wait for the transaction (should 

                                        // generate a byte)

  return spi_core_read_data(core);

}

unsigned long

spi_read_id(int core, char slave_sel)

{

  unsigned long rdid;

  char* rdid_ptr = (char*) &rdid;

  int i;

  spi_core_slave_select(core, slave_sel); // Select slave

  rdid_ptr[3] = 0;

  // Send the RDID command

  spi_write_ignore_read(core,0x9f); // 0x9f is READ ID command

  // Now we read the next 3 bytes

  for(i=0;i<3;i++)

    {

      rdid_ptr[i] = spi_read_ignore_write(core);

    }

  spi_core_slave_select(core, 0); // Deselect slave

  return rdid;

}

// Read status regsiter

char

spi_read_sr(int core, char slave_sel)

{

  char rdsr;

  spi_core_slave_select(core, slave_sel); // Select slave

  // Send the RDSR command

  spi_write_ignore_read(core,0x05); // 0x05 is READ status register command

  rdsr = spi_read_ignore_write(core);

  spi_core_slave_select(core, 0); // Deselect slave  

  return rdsr;

}

void

spi_read_block(int core, char slave_sel, unsigned int addr, int num_bytes,

               char* buf)

{

  int i;

  spi_core_slave_select(core, slave_sel); // Select slave

  spi_write_ignore_read(core, 0x3); // READ command

  spi_write_ignore_read(core,((addr >> 16) & 0xff)); // addres high byte

  spi_write_ignore_read(core,((addr >> 8) & 0xff)); // addres middle byte

  spi_write_ignore_read(core,((addr >> 0) & 0xff)); // addres low byte

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

    buf[i] = spi_read_ignore_write(core);

  spi_core_slave_select(core, 0); // Deselect slave  

}

void

spi_set_write_enable(int core, char slave_sel)

{

  spi_core_slave_select(core, slave_sel); // Select slave

  spi_write_ignore_read(core,0x06); // 0x06 is to set write enable

  spi_core_slave_select(core, 0); // Deselect slave  

}

// Write up to 256 bytes of data to a page, always from offset 0

void

spi_page_program(int core, char slave_sel, short page_num, int num_bytes,

                 char* buf)

{

  // Set WE latch

  spi_set_write_enable(core, slave_sel);

  while(!(spi_read_sr(core, slave_sel) & 0x2)); // Check it's set

  int i;

  if (!(num_bytes > 0)) return;

  if (num_bytes > 256) return;

  spi_core_slave_select(core, slave_sel); // Select slave

  spi_write_ignore_read(core, 0x2); // Page program command

  spi_write_ignore_read(core,((page_num >> 8) & 0xff)); // addres high byte

  spi_write_ignore_read(core,((page_num >> 0) & 0xff)); // addres middle byte

  spi_write_ignore_read(core,0); // addres low byte

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

    spi_write_ignore_read(core, buf[i]);

  spi_core_slave_select(core, 0); // Deselect slave  

 // Now poll status reg for WIP bit

  while((spi_read_sr(core, slave_sel) & 0x1));

}

// Erase a sector - assumes 128KByte memory, so 4 sectors of 32KBytes each

void

spi_sector_erase(int core, char slave_sel, unsigned int sector)

{

  // Set WE latch

  spi_set_write_enable(core, slave_sel);

  while(!(spi_read_sr(core, slave_sel) & 0x2)); // Check it's set

  spi_core_slave_select(core, slave_sel); // Select slave

  spi_write_ignore_read(core, 0xd8); // Sector erase command

  spi_write_ignore_read(core,(sector>>1)&0x1); // sector select high bit (bit 

                                               // 16 of addr)

  spi_write_ignore_read(core,(sector&0x1)<<7); // sector select low bit (bit 15

                                               // of addr)

  spi_write_ignore_read(core,0); // addres low byte  

  spi_core_slave_select(core, 0); // Deselect slave  

  // Now poll status reg for WIP bit

  while((spi_read_sr(core, slave_sel) & 0x1));

}

// Erase entire device

void

spi_bulk_erase(int core, char slave_sel)

{

 // Set WE latch

  spi_set_write_enable(core, slave_sel);

  while(!(spi_read_sr(core, slave_sel) & 0x2)); // Check it's set

  spi_core_slave_select(core, slave_sel); // Select slave

  spi_write_ignore_read(core, 0xc7); // Bulk erase

  spi_core_slave_select(core, 0); // Deselect slave  

 // Now poll status reg for WIP bit

  while((spi_read_sr(core, slave_sel) & 0x1));

}

extern unsigned long spiprogram_data, _spiprogram_data;

extern unsigned long end_spiprogram_data, _end_spiprogram_data;

#define printhelp() printf("\nUsage: \n\t[p]rogram\t\twrite program to flash\n\t[v]erify\t\tveryify written program\n\t[s]tatus\t\tprint status of SPI flash\n\n")

void

print_spi_status(void)

{

  printf("SPI core: %d\n",spi_master);

  printf("SPI slave select: 0x%x\n",slave&0xff);

  printf("SPI slave info:\n");

  printf("\tID:\t%x\n", spi_read_id(spi_master, slave));

  printf("\tSR:\t%x\n", spi_read_sr(spi_master, slave));

  printf("\n");

  printf("Programming file from 0x%x-0x%x, %d bytes\n",programming_file_start,

         programming_file_end,

         programming_file_length);

  printf("Embedded length: %d\n", (unsigned long) spiprogram_data);

}

// Verify contents of SPI flash

void

verify_spi(int core, char slave_sel, char * data, unsigned int length)

{

  unsigned int i;

  unsigned int page_num = 0;

  unsigned int bytes_this_page;

  char verify_buf[256];

  int verify_error = 0;

  printf("* Verifying contents of SPI flash.\n");

  while(length)

    {

      bytes_this_page = (length >= 256) ? 256 : length;

      spi_read_block(spi_master, slave, (page_num<<8), bytes_this_page,

                     verify_buf);

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

        {

          if (verify_buf[i] != data[i])

            {

              printf("* Verify error! Byte %d of page %d - was 0x%x, expected 0x%x\n", i, page_num, verify_buf[i] & 0xff, data[i] & 0xff);

              verify_error=1;

            }

        }

      data +=256;

      length -= (length >= 256) ? 256 : length;

      page_num++;

    }

  if (verify_error)

    printf("* SPI flash verify NOT OK\n");

  else

    printf("* SPI flash verify OK\n");

}

// Function to fully erase and program SPI flash

void

program_spi(int core, char slave_sel, char * data, unsigned int length)

{

  char *program_data_ptr = data;

  unsigned int program_data_length = length;

  unsigned int i;

  unsigned int page_num = 0;

  unsigned int bytes_this_page;

  printf("* Erasing SPI flash\n");

  spi_bulk_erase(core,slave_sel);

  printf("* SPI flash erased\n");

  while(length)

    {

      bytes_this_page = (length >= 256) ? 256 : length;

      printf("* SPI page %d being programmed with %d bytes", page_num, bytes_this_page);

      spi_page_program(core, slave_sel, page_num, bytes_this_page, data);

      printf("\n");

      data +=256;

      length -= (length >= 256) ? 256 : length;

      page_num++;

    }

  printf("* SPI flash programmed\n");

  verify_spi(core,slave_sel,program_data_ptr,program_data_length);

}

int

main()

{

  uart_init(0); // init the UART before we can printf

  volatile char c;

  int i,j;

  spi_master = 0;

  slave = 1;

  spi_core_slave_select(spi_master, 0); // Deselect slaves

  // Clear the read FIFO

  while (spi_core_data_avail(spi_master))

    c = spi_core_read_data(spi_master);

  programming_file_start = (unsigned long) &spiprogram_data;

  programming_file_end = (unsigned long) &end_spiprogram_data;

  programming_file_length = programming_file_end - programming_file_start;

  // SPI core 0, should already be configured to read out data

  // when we reset.

  printf("\n\n\tSPI flash programming app\n\n");

  while(1){

    printf("[p,v,s,h] > ");

    c = uart_getc(DEFAULT_UART);

    printf("%c",c);

    printf("\n");

    if (c == 'h')

      printhelp();

    else if (c == 's')

      print_spi_status();

    else if (c == 'p')

      program_spi(spi_master, slave, (char *) &spiprogram_data, programming_file_length);

    else if (c == 'v')

      verify_spi(spi_master, slave, (char *) &spiprogram_data, programming_file_length);

  }

  return 0;

}