move more nor flash implementation details

[openocd.git] / src / flash / nor / core.c

/***************************************************************************
 *   Copyright (C) 2009 Zachary T Welch <zw@superlucidity.net>             *
 *                                                                         *
 *   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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <flash/flash.h>
#include <flash/nor/imp.h>
#include <target/image.h>

// in flash.c, to be moved here
extern struct flash_driver *flash_drivers[];
extern struct flash_bank *flash_banks;

struct flash_driver *flash_driver_find_by_name(const char *name)
{
        for (unsigned i = 0; flash_drivers[i]; i++)
        {
                if (strcmp(name, flash_drivers[i]->name) == 0)
                        return flash_drivers[i];
        }
        return NULL;
}

int flash_driver_erase(struct flash_bank *bank, int first, int last)
{
        int retval;

        retval = bank->driver->erase(bank, first, last);
        if (retval != ERROR_OK)
        {
                LOG_ERROR("failed erasing sectors %d to %d (%d)", first, last, retval);
        }

        return retval;
}

int flash_driver_protect(struct flash_bank *bank, int set, int first, int last)
{
        int retval;

        retval = bank->driver->protect(bank, set, first, last);
        if (retval != ERROR_OK)
        {
                LOG_ERROR("failed setting protection for areas %d to %d (%d)", first, last, retval);
        }

        return retval;
}

int flash_driver_write(struct flash_bank *bank,
                uint8_t *buffer, uint32_t offset, uint32_t count)
{
        int retval;

        retval = bank->driver->write(bank, buffer, offset, count);
        if (retval != ERROR_OK)
        {
                LOG_ERROR("error writing to flash at address 0x%08" PRIx32 " at offset 0x%8.8" PRIx32 " (%d)",
                          bank->base, offset, retval);
        }

        return retval;
}


void flash_bank_add(struct flash_bank *bank)
{
        /* put flash bank in linked list */
        unsigned bank_num = 0;
        if (flash_banks)
        {
                /* find last flash bank */
                struct flash_bank *p = flash_banks;
                while (NULL != p->next)
                {
                        bank_num += 1;
                        p = p->next;
                }
                p->next = bank;
                bank_num += 1;
        }
        else
                flash_banks = bank;

        bank->bank_number = bank_num;
}

struct flash_bank *flash_bank_list(void)
{
        return flash_banks;
}

/* erase given flash region, selects proper bank according to target and address */
static int flash_iterate_address_range(struct target *target, uint32_t addr, uint32_t length,
                int (*callback)(struct flash_bank *bank, int first, int last))
{
        struct flash_bank *c;
        int first = -1;
        int last = -1;
        int i;

        if ((c = get_flash_bank_by_addr(target, addr)) == NULL)
                return ERROR_FLASH_DST_OUT_OF_BANK; /* no corresponding bank found */

        if (c->size == 0 || c->num_sectors == 0)
        {
                LOG_ERROR("Bank is invalid");
                return ERROR_FLASH_BANK_INVALID;
        }

        if (length == 0)
        {
                /* special case, erase whole bank when length is zero */
                if (addr != c->base)
                        return ERROR_FLASH_DST_BREAKS_ALIGNMENT;

                return callback(c, 0, c->num_sectors - 1);
        }

        /* check whether it fits */
        if (addr + length - 1 > c->base + c->size - 1)
                return ERROR_FLASH_DST_BREAKS_ALIGNMENT;

        addr -= c->base;

        for (i = 0; i < c->num_sectors; i++)
        {
                /* check whether sector overlaps with the given range and is not yet erased */
                if (addr < c->sectors[i].offset + c->sectors[i].size && addr + length > c->sectors[i].offset && c->sectors[i].is_erased != 1) {
                        /* if first is not set yet then this is the first sector */
                        if (first == -1)
                                first = i;
                        last = i; /* and it is the last one so far in any case */
                }
        }

        if (first == -1 || last == -1)
                return ERROR_OK;

        return callback(c, first, last);
}

int flash_erase_address_range(struct target *target, uint32_t addr, uint32_t length)
{
        return flash_iterate_address_range(target,
                        addr, length, &flash_driver_erase);
}

static int flash_driver_unprotect(struct flash_bank *bank, int first, int last)
{
        return flash_driver_protect(bank, 0, first, last);
}

static int flash_unlock_address_range(struct target *target, uint32_t addr, uint32_t length)
{
        return flash_iterate_address_range(target,
                        addr, length, &flash_driver_unprotect);
}

int flash_write_unlock(struct target *target, struct image *image,
                uint32_t *written, int erase, bool unlock)
{
        int retval = ERROR_OK;

        int section;
        uint32_t section_offset;
        struct flash_bank *c;
        int *padding;

        section = 0;
        section_offset = 0;

        if (written)
                *written = 0;

        if (erase)
        {
                /* assume all sectors need erasing - stops any problems
                 * when flash_write is called multiple times */

                flash_set_dirty();
        }

        /* allocate padding array */
        padding = malloc(image->num_sections * sizeof(padding));

        /* loop until we reach end of the image */
        while (section < image->num_sections)
        {
                uint32_t buffer_size;
                uint8_t *buffer;
                int section_first;
                int section_last;
                uint32_t run_address = image->sections[section].base_address + section_offset;
                uint32_t run_size = image->sections[section].size - section_offset;
                int pad_bytes = 0;

                if (image->sections[section].size ==  0)
                {
                        LOG_WARNING("empty section %d", section);
                        section++;
                        section_offset = 0;
                        continue;
                }

                /* find the corresponding flash bank */
                if ((c = get_flash_bank_by_addr(target, run_address)) == NULL)
                {
                        section++; /* and skip it */
                        section_offset = 0;
                        continue;
                }

                /* collect consecutive sections which fall into the same bank */
                section_first = section;
                section_last = section;
                padding[section] = 0;
                while ((run_address + run_size - 1 < c->base + c->size - 1)
                                && (section_last + 1 < image->num_sections))
                {
                        if (image->sections[section_last + 1].base_address < (run_address + run_size))
                        {
                                LOG_DEBUG("section %d out of order(very slightly surprising, but supported)", section_last + 1);
                                break;
                        }
                        /* if we have multiple sections within our image, flash programming could fail due to alignment issues
                         * attempt to rebuild a consecutive buffer for the flash loader */
                        pad_bytes = (image->sections[section_last + 1].base_address) - (run_address + run_size);
                        if ((run_address + run_size + pad_bytes) > (c->base + c->size))
                                break;
                        padding[section_last] = pad_bytes;
                        run_size += image->sections[++section_last].size;
                        run_size += pad_bytes;
                        padding[section_last] = 0;

                        LOG_INFO("Padding image section %d with %d bytes", section_last-1, pad_bytes);
                }

                /* fit the run into bank constraints */
                if (run_address + run_size - 1 > c->base + c->size - 1)
                {
                        LOG_WARNING("writing %d bytes only - as image section is %d bytes and bank is only %d bytes", \
                                    (int)(c->base + c->size - run_address), (int)(run_size), (int)(c->size));
                        run_size = c->base + c->size - run_address;
                }

                /* allocate buffer */
                buffer = malloc(run_size);
                buffer_size = 0;

                /* read sections to the buffer */
                while (buffer_size < run_size)
                {
                        size_t size_read;

                        size_read = run_size - buffer_size;
                        if (size_read > image->sections[section].size - section_offset)
                            size_read = image->sections[section].size - section_offset;

                        if ((retval = image_read_section(image, section, section_offset,
                                        size_read, buffer + buffer_size, &size_read)) != ERROR_OK || size_read == 0)
                        {
                                free(buffer);
                                free(padding);
                                return retval;
                        }

                        /* see if we need to pad the section */
                        while (padding[section]--)
                                 (buffer + buffer_size)[size_read++] = 0xff;

                        buffer_size += size_read;
                        section_offset += size_read;

                        if (section_offset >= image->sections[section].size)
                        {
                                section++;
                                section_offset = 0;
                        }
                }

                retval = ERROR_OK;

                if (unlock)
                {
                        retval = flash_unlock_address_range(target, run_address, run_size);
                }
                if (retval == ERROR_OK)
                {
                        if (erase)
                        {
                                /* calculate and erase sectors */
                                retval = flash_erase_address_range(target, run_address, run_size);
                        }
                }

                if (retval == ERROR_OK)
                {
                        /* write flash sectors */
                        retval = flash_driver_write(c, buffer, run_address - c->base, run_size);
                }

                free(buffer);

                if (retval != ERROR_OK)
                {
                        free(padding);
                        return retval; /* abort operation */
                }

                if (written != NULL)
                        *written += run_size; /* add run size to total written counter */
        }

        free(padding);

        return retval;
}

int flash_write(struct target *target, struct image *image,
                uint32_t *written, int erase)
{
        return flash_write_unlock(target, image, written, erase, false);
}