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

//

// Filename:    flashdrvr.cpp

//

// Project:     CMod S6 System on a Chip, ZipCPU demonstration project

//

// Purpose:     Flash driver.  Encapsulate writing to the flash device.

//

// Creator:     Dan Gisselquist

//              Gisselquist Tecnology, LLC

//

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

//

// Copyright (C) 2016, Gisselquist Technology, LLC

//

// This program is free software (firmware): 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 3 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 MERCHANTIBILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

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

//

//

//

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <strings.h>

#include <ctype.h>

#include <string.h>

#include <signal.h>

#include <assert.h>

#include "devbus.h"

#include "regdefs.h"

#include "flashdrvr.h"

const   bool    HIGH_SPEED = false;

void    FLASHDRVR::flwait(void) {

        DEVBUS::BUSW    v;

        v = m_fpga->readio(R_QSPI_EREG);

        if ((v&ERASEFLAG)==0)

                return;

        m_fpga->writeio(R_ICONTROL, ISPIF_DIS);

        m_fpga->clear();

        m_fpga->writeio(R_ICONTROL, ISPIF_EN);

        do {

                // Start by checking that we are still erasing.  The interrupt

                // may have been generated while we were setting things up and

                // disabling things, so this just double checks for us.  If

                // the interrupt was tripped, we're done.  If not, we can now

                // wait for an interrupt.

                v = m_fpga->readio(R_QSPI_EREG);

                if (v&ERASEFLAG) {

                        m_fpga->usleep(400);

                        if (m_fpga->poll()) {

                                m_fpga->clear();

                                m_fpga->writeio(R_ICONTROL, ISPIF_EN);

                        }

                }

        } while(v & ERASEFLAG);

}

bool    FLASHDRVR::erase_sector(const unsigned sector, const bool verify_erase) {

        DEVBUS::BUSW    page[SZPAGE];

        printf("Erasing sector: %08x\n", sector);

        m_fpga->writeio(R_QSPI_EREG, DISABLEWP);

        m_fpga->writeio(R_QSPI_EREG, ERASEFLAG + sector);

        // If we're in high speed mode and we want to verify the erase, then

        // we can skip waiting for the erase to complete by issueing a read

        // command immediately.  As soon as the erase completes the read will

        // begin sending commands back.  This allows us to recover the lost 

        // time between the interrupt and the next command being received.

        if  ((!HIGH_SPEED)||(!verify_erase)) {

                flwait();

                printf("@%08x -> %08x\n", R_QSPI_EREG,

                                m_fpga->readio(R_QSPI_EREG));

                printf("@%08x -> %08x\n", R_QSPI_SREG,

                                m_fpga->readio(R_QSPI_SREG));

                printf("@%08x -> %08x\n", sector,

                                m_fpga->readio(sector));

        }

        // Now, let's verify that we erased the sector properly

        if (verify_erase) {

                for(int i=0; i<NPAGES; i++) {

                        m_fpga->readi(sector+i*SZPAGE, SZPAGE, page);

                        for(int i=0; i<SZPAGE; i++)

                                if (page[i] != 0xffffffff)

                                        return false;

                }

        }

        return true;

}

bool    FLASHDRVR::write_page(const unsigned addr, const unsigned len,

                const unsigned *data, const bool verify_write) {

        DEVBUS::BUSW    buf[SZPAGE];

        assert(len > 0);

        assert(len <= PGLEN);

        assert(PAGEOF(addr)==PAGEOF(addr+len-1));

        if (len <= 0)

                return true;

        // Write the page

        m_fpga->writeio(R_ICONTROL, ISPIF_DIS);

        m_fpga->clear();

        m_fpga->writeio(R_ICONTROL, ISPIF_EN);

        printf("Writing page: 0x%08x - 0x%08x\n", addr, addr+len-1);

        m_fpga->writeio(R_QSPI_EREG, DISABLEWP);

        m_fpga->writei(addr, len, data);

        // If we're in high speed mode and we want to verify the write, then

        // we can skip waiting for the write to complete by issueing a read

        // command immediately.  As soon as the write completes the read will

        // begin sending commands back.  This allows us to recover the lost 

        // time between the interrupt and the next command being received.

        flwait();

        // if ((!HIGH_SPEED)||(!verify_write)) { }

        if (verify_write) {

                // printf("Attempting to verify page\n");

                // NOW VERIFY THE PAGE

                m_fpga->readi(addr, len, buf);

                for(unsigned i=0; i<len; i++) {

                        if (buf[i] != data[i]) {

                                printf("\nVERIFY FAILS[%d]: %08x\n", i, i+addr);

                                printf("\t(Flash[%d]) %08x != %08x (Goal[%08x])\n",

                                        i, buf[i], data[i], i+addr);

                                return false;

                        }

                } // printf("\nVerify success\n");

        } return true;

}

bool    FLASHDRVR::write(const unsigned addr, const unsigned len,

                const unsigned *data, const bool verify) {

        // Work through this one sector at a time.

        // If this buffer is equal to the sector value(s), go on

        // If not, erase the sector

        // m_fpga->writeio(R_QSPI_CREG, 2);

        // m_fpga->readio(R_VERSION);   // Read something innocuous

        // m_fpga->writeio(R_QSPI_SREG, 0);

        // m_fpga->readio(R_VERSION);   // Read something innocuous

        for(unsigned s=SECTOROF(addr); s<SECTOROF(addr+len+SECTORSZ-1); s+=SECTORSZ) {

                // printf("IN LOOP, s=%08x\n", s);

                // Do we need to erase?

                bool    need_erase = false;

                unsigned newv = 0; // (s<addr)?addr:s;

                {

                        DEVBUS::BUSW    *sbuf = new DEVBUS::BUSW[SECTORSZ];

                        const DEVBUS::BUSW *dp;

                        unsigned        base,ln;

                        base = (addr>s)?addr:s;

                        ln=((addr+len>s+SECTORSZ)?(s+SECTORSZ):(addr+len))-base;

                        m_fpga->readi(base, ln, sbuf);

                        dp = &data[base-addr];

                        for(unsigned i=0; i<ln; i++) {

                                if ((sbuf[i]&dp[i]) != dp[i]) {

                                        printf("\nNEED-ERASE @0x%08x ... %08x != %08x (Goal)\n",

                                                i+base-addr, sbuf[i], dp[i]);

                                        need_erase = true;

                                        newv = i+base;

                                        break;

                                } else if ((sbuf[i] != dp[i])&&(newv == 0)) {

                                        // if (newv == 0)

                                                // printf("MEM[%08x] = %08x (!= %08x (Goal))\n",

                                                        // i+base, sbuf[i], dp[i]);

                                        newv = i+base;

                                }

                        }

                }

                if (newv == 0)

                        continue; // This sector already matches

                // Just erase anyway

                if (!need_erase)

                        printf("NO ERASE NEEDED\n");

                else {

                        printf("ERASING SECTOR %08x\n", s);

                        if (!erase_sector(s, verify)) {

                                printf("SECTOR ERASE FAILED!\n");

                                return false;

                        } newv = (s<addr) ? addr : s;

                }

                for(unsigned p=newv; (p<s+SECTORSZ)&&(p<addr+len); p=PAGEOF(p+PGLEN)) {

                        unsigned start = p, len = addr+len-start;

                        // BUT! if we cross page boundaries, we need to clip

                        // our results to the page boundary

                        if (PAGEOF(start+len-1)!=PAGEOF(start))

                                len = PAGEOF(start+PGLEN)-start;

                        if (!write_page(start, len, &data[p-addr], verify)) {

                                printf("WRITE-PAGE FAILED!\n");

                                return false;

                        }

                }

        }

        m_fpga->writeio(R_QSPI_EREG, 0); // Re-enable write protection

        return true;

}