Archipelago » qemu

/*

 * ST M25P80 emulator. Emulate all SPI flash devices based on the m25p80 command

 * set. Known devices table current as of Jun/2012 and taken from linux.

 * See drivers/mtd/devices/m25p80.c.

 *

 * Copyright (C) 2011 Edgar E. Iglesias <edgar.iglesias@gmail.com>

 * Copyright (C) 2012 Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>

 * Copyright (C) 2012 PetaLogix

 *

 * 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 or

 * (at your option) a later version of the License.

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */

#include "hw.h"

#include "blockdev.h"

#include "ssi.h"

#include "devices.h"

#ifdef M25P80_ERR_DEBUG

#define DB_PRINT(...) do { \

    fprintf(stderr,  ": %s: ", __func__); \

    fprintf(stderr, ## __VA_ARGS__); \

    } while (0);

#else

    #define DB_PRINT(...)

#endif

/* Fields for FlashPartInfo->flags */

/* erase capabilities */

#define ER_4K 1

#define ER_32K 2

/* set to allow the page program command to write 0s back to 1. Useful for

 * modelling EEPROM with SPI flash command set

 */

#define WR_1 0x100

typedef struct FlashPartInfo {

    const char *part_name;

    /* jedec code. (jedec >> 16) & 0xff is the 1st byte, >> 8 the 2nd etc */

    uint32_t jedec;

    /* extended jedec code */

    uint16_t ext_jedec;

    /* there is confusion between manufacturers as to what a sector is. In this

     * device model, a "sector" is the size that is erased by the ERASE_SECTOR

     * command (opcode 0xd8).

     */

    uint32_t sector_size;

    uint32_t n_sectors;

    uint32_t page_size;

    uint8_t flags;

} FlashPartInfo;

/* adapted from linux */

#define INFO(_part_name, _jedec, _ext_jedec, _sector_size, _n_sectors, _flags)\

    .part_name = (_part_name),\

    .jedec = (_jedec),\

    .ext_jedec = (_ext_jedec),\

    .sector_size = (_sector_size),\

    .n_sectors = (_n_sectors),\

    .page_size = 256,\

    .flags = (_flags),\

static const FlashPartInfo known_devices[] = {

    /* Atmel -- some are (confusingly) marketed as "DataFlash" */

    { INFO("at25fs010",   0x1f6601,      0,  32 << 10,   4, ER_4K) },

    { INFO("at25fs040",   0x1f6604,      0,  64 << 10,   8, ER_4K) },

    { INFO("at25df041a",  0x1f4401,      0,  64 << 10,   8, ER_4K) },

    { INFO("at25df321a",  0x1f4701,      0,  64 << 10,  64, ER_4K) },

    { INFO("at25df641",   0x1f4800,      0,  64 << 10, 128, ER_4K) },

    { INFO("at26f004",    0x1f0400,      0,  64 << 10,   8, ER_4K) },

    { INFO("at26df081a",  0x1f4501,      0,  64 << 10,  16, ER_4K) },

    { INFO("at26df161a",  0x1f4601,      0,  64 << 10,  32, ER_4K) },

    { INFO("at26df321",   0x1f4700,      0,  64 << 10,  64, ER_4K) },

    /* EON -- en25xxx */

    { INFO("en25f32",     0x1c3116,      0,  64 << 10,  64, ER_4K) },

    { INFO("en25p32",     0x1c2016,      0,  64 << 10,  64, 0) },

    { INFO("en25q32b",    0x1c3016,      0,  64 << 10,  64, 0) },

    { INFO("en25p64",     0x1c2017,      0,  64 << 10, 128, 0) },

    /* Intel/Numonyx -- xxxs33b */

    { INFO("160s33b",     0x898911,      0,  64 << 10,  32, 0) },

    { INFO("320s33b",     0x898912,      0,  64 << 10,  64, 0) },

    { INFO("640s33b",     0x898913,      0,  64 << 10, 128, 0) },

    /* Macronix */

    { INFO("mx25l4005a",  0xc22013,      0,  64 << 10,   8, ER_4K) },

    { INFO("mx25l8005",   0xc22014,      0,  64 << 10,  16, 0) },

    { INFO("mx25l1606e",  0xc22015,      0,  64 << 10,  32, ER_4K) },

    { INFO("mx25l3205d",  0xc22016,      0,  64 << 10,  64, 0) },

    { INFO("mx25l6405d",  0xc22017,      0,  64 << 10, 128, 0) },

    { INFO("mx25l12805d", 0xc22018,      0,  64 << 10, 256, 0) },

    { INFO("mx25l12855e", 0xc22618,      0,  64 << 10, 256, 0) },

    { INFO("mx25l25635e", 0xc22019,      0,  64 << 10, 512, 0) },

    { INFO("mx25l25655e", 0xc22619,      0,  64 << 10, 512, 0) },

    /* Spansion -- single (large) sector size only, at least

     * for the chips listed here (without boot sectors).

     */

    { INFO("s25sl004a",   0x010212,      0,  64 << 10,   8, 0) },

    { INFO("s25sl008a",   0x010213,      0,  64 << 10,  16, 0) },

    { INFO("s25sl016a",   0x010214,      0,  64 << 10,  32, 0) },

    { INFO("s25sl032a",   0x010215,      0,  64 << 10,  64, 0) },

    { INFO("s25sl032p",   0x010215, 0x4d00,  64 << 10,  64, ER_4K) },

    { INFO("s25sl064a",   0x010216,      0,  64 << 10, 128, 0) },

    { INFO("s25fl256s0",  0x010219, 0x4d00, 256 << 10, 128, 0) },

    { INFO("s25fl256s1",  0x010219, 0x4d01,  64 << 10, 512, 0) },

    { INFO("s25fl512s",   0x010220, 0x4d00, 256 << 10, 256, 0) },

    { INFO("s70fl01gs",   0x010221, 0x4d00, 256 << 10, 256, 0) },

    { INFO("s25sl12800",  0x012018, 0x0300, 256 << 10,  64, 0) },

    { INFO("s25sl12801",  0x012018, 0x0301,  64 << 10, 256, 0) },

    { INFO("s25fl129p0",  0x012018, 0x4d00, 256 << 10,  64, 0) },

    { INFO("s25fl129p1",  0x012018, 0x4d01,  64 << 10, 256, 0) },

    { INFO("s25fl016k",   0xef4015,      0,  64 << 10,  32, ER_4K | ER_32K) },

    { INFO("s25fl064k",   0xef4017,      0,  64 << 10, 128, ER_4K | ER_32K) },

    /* SST -- large erase sizes are "overlays", "sectors" are 4<< 10 */

    { INFO("sst25vf040b", 0xbf258d,      0,  64 << 10,   8, ER_4K) },

    { INFO("sst25vf080b", 0xbf258e,      0,  64 << 10,  16, ER_4K) },

    { INFO("sst25vf016b", 0xbf2541,      0,  64 << 10,  32, ER_4K) },

    { INFO("sst25vf032b", 0xbf254a,      0,  64 << 10,  64, ER_4K) },

    { INFO("sst25wf512",  0xbf2501,      0,  64 << 10,   1, ER_4K) },

    { INFO("sst25wf010",  0xbf2502,      0,  64 << 10,   2, ER_4K) },

    { INFO("sst25wf020",  0xbf2503,      0,  64 << 10,   4, ER_4K) },

    { INFO("sst25wf040",  0xbf2504,      0,  64 << 10,   8, ER_4K) },

    /* ST Microelectronics -- newer production may have feature updates */

    { INFO("m25p05",      0x202010,      0,  32 << 10,   2, 0) },

    { INFO("m25p10",      0x202011,      0,  32 << 10,   4, 0) },

    { INFO("m25p20",      0x202012,      0,  64 << 10,   4, 0) },

    { INFO("m25p40",      0x202013,      0,  64 << 10,   8, 0) },

    { INFO("m25p80",      0x202014,      0,  64 << 10,  16, 0) },

    { INFO("m25p16",      0x202015,      0,  64 << 10,  32, 0) },

    { INFO("m25p32",      0x202016,      0,  64 << 10,  64, 0) },

    { INFO("m25p64",      0x202017,      0,  64 << 10, 128, 0) },

    { INFO("m25p128",     0x202018,      0, 256 << 10,  64, 0) },

    { INFO("m45pe10",     0x204011,      0,  64 << 10,   2, 0) },

    { INFO("m45pe80",     0x204014,      0,  64 << 10,  16, 0) },

    { INFO("m45pe16",     0x204015,      0,  64 << 10,  32, 0) },

    { INFO("m25pe80",     0x208014,      0,  64 << 10,  16, 0) },

    { INFO("m25pe16",     0x208015,      0,  64 << 10,  32, ER_4K) },

    { INFO("m25px32",     0x207116,      0,  64 << 10,  64, ER_4K) },

    { INFO("m25px32-s0",  0x207316,      0,  64 << 10,  64, ER_4K) },

    { INFO("m25px32-s1",  0x206316,      0,  64 << 10,  64, ER_4K) },

    { INFO("m25px64",     0x207117,      0,  64 << 10, 128, 0) },

    /* Winbond -- w25x "blocks" are 64k, "sectors" are 4KiB */

    { INFO("w25x10",      0xef3011,      0,  64 << 10,   2, ER_4K) },

    { INFO("w25x20",      0xef3012,      0,  64 << 10,   4, ER_4K) },

    { INFO("w25x40",      0xef3013,      0,  64 << 10,   8, ER_4K) },

    { INFO("w25x80",      0xef3014,      0,  64 << 10,  16, ER_4K) },

    { INFO("w25x16",      0xef3015,      0,  64 << 10,  32, ER_4K) },

    { INFO("w25x32",      0xef3016,      0,  64 << 10,  64, ER_4K) },

    { INFO("w25q32",      0xef4016,      0,  64 << 10,  64, ER_4K) },

    { INFO("w25x64",      0xef3017,      0,  64 << 10, 128, ER_4K) },

    { INFO("w25q64",      0xef4017,      0,  64 << 10, 128, ER_4K) },

    /* Numonyx -- n25q128 */

    { INFO("n25q128",      0x20ba18,      0,  64 << 10, 256, 0) },

    { },

};

typedef enum {

    NOP = 0,

    PP = 0x2,

    READ = 0x3,

    WRDI = 0x4,

    RDSR = 0x5,

    WREN = 0x6,

    FAST_READ = 0xb,

    ERASE_4K = 0x20,

    ERASE_32K = 0x52,

    ERASE_SECTOR = 0xd8,

    JEDEC_READ = 0x9f,

    BULK_ERASE = 0xc7,

} FlashCMD;

typedef enum {

    STATE_IDLE,

    STATE_PAGE_PROGRAM,

    STATE_READ,

    STATE_COLLECTING_DATA,

    STATE_READING_DATA,

} CMDState;

typedef struct Flash {

    SSISlave ssidev;

    uint32_t r;

    BlockDriverState *bdrv;

    uint8_t *storage;

    uint32_t size;

    int page_size;

    uint8_t state;

    uint8_t data[16];

    uint32_t len;

    uint32_t pos;

    uint8_t needed_bytes;

    uint8_t cmd_in_progress;

    uint64_t cur_addr;

    bool write_enable;

    int64_t dirty_page;

    char *part_name;

    const FlashPartInfo *pi;

} Flash;

static void bdrv_sync_complete(void *opaque, int ret)

{

    /* do nothing. Masters do not directly interact with the backing store,

     * only the working copy so no mutexing required.

     */

}

static void flash_sync_page(Flash *s, int page)

{

    if (s->bdrv) {

        int bdrv_sector, nb_sectors;

        QEMUIOVector iov;

        bdrv_sector = (page * s->pi->page_size) / BDRV_SECTOR_SIZE;

        nb_sectors = DIV_ROUND_UP(s->pi->page_size, BDRV_SECTOR_SIZE);

        qemu_iovec_init(&iov, 1);

        qemu_iovec_add(&iov, s->storage + bdrv_sector * BDRV_SECTOR_SIZE,

                                                nb_sectors * BDRV_SECTOR_SIZE);

        bdrv_aio_writev(s->bdrv, bdrv_sector, &iov, nb_sectors,

                                                bdrv_sync_complete, NULL);

    }

}

static inline void flash_sync_area(Flash *s, int64_t off, int64_t len)

{

    int64_t start, end, nb_sectors;

    QEMUIOVector iov;

    if (!s->bdrv) {

        return;

    }

    assert(!(len % BDRV_SECTOR_SIZE));

    start = off / BDRV_SECTOR_SIZE;

    end = (off + len) / BDRV_SECTOR_SIZE;

    nb_sectors = end - start;

    qemu_iovec_init(&iov, 1);

    qemu_iovec_add(&iov, s->storage + (start * BDRV_SECTOR_SIZE),

                                        nb_sectors * BDRV_SECTOR_SIZE);

    bdrv_aio_writev(s->bdrv, start, &iov, nb_sectors, bdrv_sync_complete, NULL);

}

static void flash_erase(Flash *s, int offset, FlashCMD cmd)

{

    uint32_t len;

    uint8_t capa_to_assert = 0;

    switch (cmd) {

    case ERASE_4K:

        len = 4 << 10;

        capa_to_assert = ER_4K;

        break;

    case ERASE_32K:

        len = 32 << 10;

        capa_to_assert = ER_32K;

        break;

    case ERASE_SECTOR:

        len = s->pi->sector_size;

        break;

    case BULK_ERASE:

        len = s->size;

        break;

    default:

        abort();

    }

    DB_PRINT("offset = %#x, len = %d\n", offset, len);

    if ((s->pi->flags & capa_to_assert) != capa_to_assert) {

        hw_error("m25p80: %dk erase size not supported by device\n", len);

    }

    if (!s->write_enable) {

        DB_PRINT("erase with write protect!\n");

        return;

    }

    memset(s->storage + offset, 0xff, len);

    flash_sync_area(s, offset, len);

}

static inline void flash_sync_dirty(Flash *s, int64_t newpage)

{

    if (s->dirty_page >= 0 && s->dirty_page != newpage) {

        flash_sync_page(s, s->dirty_page);

        s->dirty_page = newpage;

    }

}

static inline

void flash_write8(Flash *s, uint64_t addr, uint8_t data)

{

    int64_t page = addr / s->pi->page_size;

    uint8_t prev = s->storage[s->cur_addr];

    if (!s->write_enable) {

        DB_PRINT("write with write protect!\n");

    }

    if ((prev ^ data) & data) {

        DB_PRINT("programming zero to one! addr=%lx  %x -> %x\n",

                  addr, prev, data);

    }

    if (s->pi->flags & WR_1) {

        s->storage[s->cur_addr] = data;

    } else {

        s->storage[s->cur_addr] &= data;

    }

    flash_sync_dirty(s, page);

    s->dirty_page = page;

}

static void complete_collecting_data(Flash *s)

{

    s->cur_addr = s->data[0] << 16;

    s->cur_addr |= s->data[1] << 8;

    s->cur_addr |= s->data[2];

    switch (s->cmd_in_progress) {

    case PP:

        s->state = STATE_PAGE_PROGRAM;

        break;

    case READ:

    case FAST_READ:

        s->state = STATE_READ;

        break;

    case ERASE_4K:

    case ERASE_32K:

    case ERASE_SECTOR:

        flash_erase(s, s->cur_addr, s->cmd_in_progress);

        break;

    default:

        break;

    }

}

static void decode_new_cmd(Flash *s, uint32_t value)

{

    s->cmd_in_progress = value;

    DB_PRINT("decoded new command:%x\n", value);

    switch (value) {

    case ERASE_4K:

    case ERASE_32K:

    case ERASE_SECTOR:

    case READ:

    case PP:

        s->needed_bytes = 3;

        s->pos = 0;

        s->len = 0;

        s->state = STATE_COLLECTING_DATA;

        break;

    case FAST_READ:

        s->needed_bytes = 4;

        s->pos = 0;

        s->len = 0;

        s->state = STATE_COLLECTING_DATA;

        break;

    case WRDI:

        s->write_enable = false;

        break;

    case WREN:

        s->write_enable = true;

        break;

    case RDSR:

        s->data[0] = (!!s->write_enable) << 1;

        s->pos = 0;

        s->len = 1;

        s->state = STATE_READING_DATA;

        break;

    case JEDEC_READ:

        DB_PRINT("populated jedec code\n");

        s->data[0] = (s->pi->jedec >> 16) & 0xff;

        s->data[1] = (s->pi->jedec >> 8) & 0xff;

        s->data[2] = s->pi->jedec & 0xff;

        if (s->pi->ext_jedec) {

            s->data[3] = (s->pi->ext_jedec >> 8) & 0xff;

            s->data[4] = s->pi->ext_jedec & 0xff;

            s->len = 5;

        } else {

            s->len = 3;

        }

        s->pos = 0;

        s->state = STATE_READING_DATA;

        break;

    case BULK_ERASE:

        if (s->write_enable) {

            DB_PRINT("chip erase\n");

            flash_erase(s, 0, BULK_ERASE);

        } else {

            DB_PRINT("chip erase with write protect!\n");

        }

        break;

    case NOP:

        break;

    default:

        DB_PRINT("Unknown cmd %x\n", value);

        break;

    }

}

static int m25p80_cs(SSISlave *ss, bool select)

{

    Flash *s = FROM_SSI_SLAVE(Flash, ss);

    if (select) {

        s->len = 0;

        s->pos = 0;

        s->state = STATE_IDLE;

        flash_sync_dirty(s, -1);

    }

    DB_PRINT("%sselect\n", select ? "de" : "");

    return 0;

}

static uint32_t m25p80_transfer8(SSISlave *ss, uint32_t tx)

{

    Flash *s = FROM_SSI_SLAVE(Flash, ss);

    uint32_t r = 0;

    switch (s->state) {

    case STATE_PAGE_PROGRAM:

        DB_PRINT("page program cur_addr=%lx data=%x\n", s->cur_addr,

                 (uint8_t)tx);

        flash_write8(s, s->cur_addr, (uint8_t)tx);

        s->cur_addr++;

        break;

    case STATE_READ:

        r = s->storage[s->cur_addr];

        DB_PRINT("READ 0x%lx=%x\n", s->cur_addr, r);

        s->cur_addr = (s->cur_addr + 1) % s->size;

        break;

    case STATE_COLLECTING_DATA:

        s->data[s->len] = (uint8_t)tx;

        s->len++;

        if (s->len == s->needed_bytes) {

            complete_collecting_data(s);

        }

        break;

    case STATE_READING_DATA:

        r = s->data[s->pos];

        s->pos++;

        if (s->pos == s->len) {

            s->pos = 0;

            s->state = STATE_IDLE;

        }

        break;

    default:

    case STATE_IDLE:

        decode_new_cmd(s, (uint8_t)tx);

        break;

    }

    return r;

}

static int m25p80_init(SSISlave *ss)

{

    DriveInfo *dinfo;

    Flash *s = FROM_SSI_SLAVE(Flash, ss);

    const FlashPartInfo *i;

    if (!s->part_name) { /* default to actual m25p80 if no partname given */

        s->part_name = (char *)"m25p80";

    }

    i = known_devices;

    for (i = known_devices;; i++) {

        assert(i);

        if (!i->part_name) {

            fprintf(stderr, "Unknown SPI flash part: \"%s\"\n", s->part_name);

            return 1;

        } else if (!strcmp(i->part_name, s->part_name)) {

            s->pi = i;

            break;

        }

    }

    s->size = s->pi->sector_size * s->pi->n_sectors;

    s->dirty_page = -1;

    s->storage = qemu_blockalign(s->bdrv, s->size);

    dinfo = drive_get_next(IF_MTD);

    if (dinfo && dinfo->bdrv) {

        DB_PRINT("Binding to IF_MTD drive\n");

        s->bdrv = dinfo->bdrv;

        /* FIXME: Move to late init */

        if (bdrv_read(s->bdrv, 0, s->storage, DIV_ROUND_UP(s->size,

                                                    BDRV_SECTOR_SIZE))) {

            fprintf(stderr, "Failed to initialize SPI flash!\n");

            return 1;

        }

    } else {

        memset(s->storage, 0xFF, s->size);

    }

    return 0;

}

static void m25p80_pre_save(void *opaque)

{

    flash_sync_dirty((Flash *)opaque, -1);

}

static const VMStateDescription vmstate_m25p80 = {

    .name = "xilinx_spi",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .pre_save = m25p80_pre_save,

    .fields = (VMStateField[]) {

        VMSTATE_UINT8(state, Flash),

        VMSTATE_UINT8_ARRAY(data, Flash, 16),

        VMSTATE_UINT32(len, Flash),

        VMSTATE_UINT32(pos, Flash),

        VMSTATE_UINT8(needed_bytes, Flash),

        VMSTATE_UINT8(cmd_in_progress, Flash),

        VMSTATE_UINT64(cur_addr, Flash),

        VMSTATE_BOOL(write_enable, Flash),

        VMSTATE_END_OF_LIST()

    }

};

static Property m25p80_properties[] = {

    DEFINE_PROP_STRING("partname", Flash, part_name),

    DEFINE_PROP_END_OF_LIST(),

};

static void m25p80_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SSISlaveClass *k = SSI_SLAVE_CLASS(klass);

    k->init = m25p80_init;

    k->transfer = m25p80_transfer8;

    k->set_cs = m25p80_cs;

    k->cs_polarity = SSI_CS_LOW;

    dc->props = m25p80_properties;

    dc->vmsd = &vmstate_m25p80;

}

static const TypeInfo m25p80_info = {

    .name           = "m25p80",

    .parent         = TYPE_SSI_SLAVE,

    .instance_size  = sizeof(Flash),

    .class_init     = m25p80_class_init,

};

static void m25p80_register_types(void)

{

    type_register_static(&m25p80_info);

}

type_init(m25p80_register_types)