add emulation of atmel pflash memory

Evgeniy Dushistov
1 parent 29020076
Showing 3 changed files with 514 additions and 0 deletions
Makefile.target
hw/flash.h
hw/pflash_atmel.c
@@ -411,6 +411,7 @@ obj-sparc-y += cs4231.o eccmemctl.o sbi.o sun4c_intctl.o
 endif
  
 obj-arm-y = integratorcp.o versatilepb.o smc91c111.o arm_pic.o arm_timer.o
+obj-arm-y += pflash_atmel.o
 obj-arm-y += arm_boot.o pl011.o pl031.o pl050.o pl080.o pl110.o pl181.o pl190.o
 obj-arm-y += versatile_pci.o
 obj-arm-y += realview_gic.o realview.o arm_sysctl.o mpcore.o
@@ -16,6 +16,17 @@ pflash_t *pflash_cfi02_register(target_phys_addr_t base, ram_addr_t off,
                                 uint16_t id2, uint16_t id3,
                                 uint16_t unlock_addr0, uint16_t unlock_addr1);
  
+/* pflash_cfi_atmel.c */
+pflash_t *pflash_cfi_atmel_register(target_phys_addr_t base, ram_addr_t off,
+				    BlockDriverState *bs,
+				    uint32_t boot_sect_len,
+				    int nb_boot_blocks,
+				    uint32_t sector_len,
+				    int nb_blocs, int width,
+				    uint16_t id0, uint16_t id1,
+				    uint16_t id2, uint16_t id3);
+
+
 /* nand.c */
 typedef struct NANDFlashState NANDFlashState;
 NANDFlashState *nand_init(int manf_id, int chip_id);
+/*
+ *  CFI parallel flash for emulating Atmel NOR flash (AT49BV642D)
+ *
+ *  Copyright (c) 2009 Evgeniy Dushistov
+ *  Copyright (c) 2006 Thorsten Zitterell
+ *  Copyright (c) 2005 Jocelyn Mayer
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * For now, this code can emulate flashes of 1, 2 or 4 bytes width.
+ * Supported commands/modes are:
+ * - flash read
+ * - flash write
+ * - flash ID read
+ * - sector erase
+ *
+ * It does not support timings
+ * It does not support flash interleaving
+ * It does not implement software data protection as found in many real chips
+ * It does not implement erase suspend/resume commands
+ * It does not implement multiple sectors erase
+ *
+ * It does not implement much more ...
+ */
+
+#include "hw.h"
+#include "flash.h"
+#include "block.h"
+#include "qemu-timer.h"
+
+#define PFLASH_BUG(fmt, ...)                                    \
+    do {                                                        \
+        printf("PFLASH: Possible BUG - " fmt, ## __VA_ARGS__);  \
+        exit(1);                                                \
+    } while(0)
+
+//#define PFLASH_DEBUG
+#ifdef PFLASH_DEBUG
+#define DPRINTF(fmt, ...)                           \
+    do {                                            \
+        printf("PFLASH: " fmt , ## __VA_ARGS__);    \
+    } while (0)
+#else
+#define DPRINTF(fmt, ...) do { } while (0)
+#endif
+
+struct pflash_t {
+    BlockDriverState *bs;
+    target_phys_addr_t base;
+    target_phys_addr_t sector_len;
+    target_phys_addr_t boot_sect_len;
+    target_phys_addr_t nb_blocks;
+    target_phys_addr_t nb_boot_blocks;
+    target_phys_addr_t total_len;
+    int width;
+    int wcycle; /* if 0, the flash is read normally */
+    int bypass;
+    int ro;
+    uint8_t cmd;
+    uint8_t status;
+    uint16_t ident[4];
+    target_phys_addr_t counter;
+    QEMUTimer *timer;
+    ram_addr_t off;
+    int fl_mem;
+    void *storage;
+};
+
+#define AT49_FLASH_CODE1        0xAA
+#define AT49_FLASH_CODE2        0x55
+#define AT49_ID_IN_CODE        0x90
+#define AT49_ID_OUT_CODE        0xF0
+#define AT49_FLASH_Setup_Erase     0x80
+#define AT49_FLASH_Program         0xA0
+#define AT49_FLASH_Sector_Erase    0x30
+#define AT49_CMD_READ_ARRAY        0x00F0
+#define AT49_MEM_FLASH_ADDR1 (0x5555<<1)
+#define AT49_MEM_FLASH_ADDR2 (0x00002AAA<<1)
+
+static void pflash_timer (void *opaque)
+{
+    pflash_t *pfl = opaque;
+
+    DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
+    /* Reset flash */
+    pfl->status ^= 0x80;
+    if (pfl->bypass) {
+        pfl->wcycle = 2;
+    } else {
+        cpu_register_physical_memory(pfl->base, pfl->total_len,
+                                     pfl->off | IO_MEM_ROMD | pfl->fl_mem);
+        pfl->wcycle = 0;
+    }
+    pfl->cmd = 0;
+}
+
+static uint32_t pflash_read (pflash_t *pfl, target_phys_addr_t offset,
+                             int width)
+{
+    target_phys_addr_t boff;
+    uint32_t ret;
+    uint8_t *p;
+
+    ret = -1;
+    boff = offset & 0xFF; /* why this here ?? */
+
+    if (pfl->width == 2)
+        boff = boff >> 1;
+    else if (pfl->width == 4)
+        boff = boff >> 2;
+
+    DPRINTF("%s: reading offset " TARGET_FMT_plx " under cmd %02x width %d\n",
+            __func__, offset, pfl->cmd, width);
+
+    switch (pfl->cmd) {
+    case 0x00:
+        /* Flash area read */
+        p = pfl->storage;
+        switch (width) {
+        case 1:
+            ret = p[offset];
+            DPRINTF("%s: data offset " TARGET_FMT_plx " %02x\n",
+                    __func__, offset, ret);
+            break;
+        case 2:
+#if defined(TARGET_WORDS_BIGENDIAN)
+            ret = p[offset] << 8;
+            ret |= p[offset + 1];
+#else
+            ret = p[offset];
+            ret |= p[offset + 1] << 8;
+#endif
+            DPRINTF("%s: data offset " TARGET_FMT_plx " %04x\n",
+                    __func__, offset, ret);
+            break;
+        case 4:
+#if defined(TARGET_WORDS_BIGENDIAN)
+            ret = p[offset] << 24;
+            ret |= p[offset + 1] << 16;
+            ret |= p[offset + 2] << 8;
+            ret |= p[offset + 3];
+#else
+            ret = p[offset];
+            ret |= p[offset + 1] << 8;
+            ret |= p[offset + 1] << 8;
+            ret |= p[offset + 2] << 16;
+            ret |= p[offset + 3] << 24;
+#endif
+            DPRINTF("%s: data offset " TARGET_FMT_plx " %08x\n",
+                    __func__, offset, ret);
+            break;
+        default:
+            DPRINTF("BUG in %s\n", __func__);
+        }
+
+        break;
+    case AT49_FLASH_Setup_Erase: /* Block erase */
+    case AT49_FLASH_Sector_Erase:
+    case AT49_FLASH_Program: /* Write block */
+        /* Status register read */
+        ret = pfl->status;
+        DPRINTF("%s: status %x\n", __func__, ret);
+        break;
+    case AT49_ID_IN_CODE:
+        DPRINTF("we read ID, boff %u, %X %X\n", boff, pfl->ident[0], pfl->ident[1]);
+        /* flash ID read */
+        switch (boff) {
+        case 0x00:
+        case 0x01:
+            ret = pfl->ident[boff & 0x01];
+            break;
+        case 0x02:
+            ret = 0x00; /* Pretend all sectors are unprotected */
+            break;
+        default:
+            break;
+        }
+        break;
+    default:
+        /* This should never happen : reset state & treat it as a read */
+        DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
+        pfl->wcycle = 0;
+        pfl->cmd = 0;
+    }
+    DPRINTF("%s: ret %X\n", __func__, ret);
+    return ret;
+}
+
+/* update flash content on disk */
+static void pflash_update(pflash_t *pfl, int offset,
+                          int size)
+{
+    int offset_end;
+    if (pfl->bs) {
+        offset_end = offset + size;
+        /* round to sectors */
+        offset = offset >> 9;
+        offset_end = (offset_end + 511) >> 9;
+        bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
+                   offset_end - offset);
+    }
+}
+
+static inline void pflash_data_write(pflash_t *pfl, target_phys_addr_t offset,
+                                     uint32_t value, int width)
+{
+    uint8_t *p = pfl->storage;
+
+    DPRINTF("%s: block write offset " TARGET_FMT_plx
+            " value %x counter " TARGET_FMT_plx "\n",
+            __func__, offset, value, pfl->counter);
+    switch (width) {
+    case 1:
+        p[offset] = value;
+        pflash_update(pfl, offset, 1);
+        break;
+    case 2:
+#if defined(TARGET_WORDS_BIGENDIAN)
+        p[offset] = value >> 8;
+        p[offset + 1] = value;
+#else
+        p[offset] = value;
+        p[offset + 1] = value >> 8;
+#endif
+        pflash_update(pfl, offset, 2);
+        break;
+    case 4:
+#if defined(TARGET_WORDS_BIGENDIAN)
+        p[offset] = value >> 24;
+        p[offset + 1] = value >> 16;
+        p[offset + 2] = value >> 8;
+        p[offset + 3] = value;
+#else
+        p[offset] = value;
+        p[offset + 1] = value >> 8;
+        p[offset + 2] = value >> 16;
+        p[offset + 3] = value >> 24;
+#endif
+        pflash_update(pfl, offset, 4);
+        break;
+    }
+
+}
+
+static void pflash_write(pflash_t *pfl, target_phys_addr_t offset,
+                         uint32_t value, int width)
+{
+    target_phys_addr_t boff;
+    uint8_t *p;
+    uint8_t cmd;
+
+    cmd = value;
+
+    DPRINTF("%s: writing offset " TARGET_FMT_plx " value %08x width %d wcycle 0x%x\n",
+            __func__, offset, value, width, pfl->wcycle);
+
+    /* Set the device in I/O access mode */
+    cpu_register_physical_memory(pfl->base, pfl->total_len, pfl->fl_mem);
+    boff = offset & (pfl->sector_len - 1);
+
+    if (pfl->width == 2)
+        boff = boff >> 1;
+    else if (pfl->width == 4)
+        boff = boff >> 2;
+
+    switch (pfl->wcycle) {
+    case 0:
+        /* read mode */
+        switch (cmd) {
+        case AT49_CMD_READ_ARRAY:
+            if (pfl->cmd == AT49_FLASH_Program) {
+                DPRINTF("%s: finish program\n", __func__);
+                goto reset_flash;
+            }
+            goto error_flash;
+        case AT49_FLASH_CODE1:
+            if (offset == AT49_MEM_FLASH_ADDR1) {
+                DPRINTF("flash code 1\n");
+                break;
+            }
+        default:
+            goto error_flash;
+        }
+        pfl->wcycle++;
+        pfl->cmd = cmd;
+        return;
+    case 1:
+        DPRINTF("offset %X, cmd %X wcyle 1\n", offset, pfl->cmd);
+        switch (pfl->cmd) {
+        case AT49_FLASH_Program:
+            DPRINTF("%s: Single Byte Program\n", __func__);
+            pflash_data_write(pfl, offset, value, width);
+            /* pfl->status = (value & 0x80); /\* Ready! *\/ */
+            pfl->wcycle = 0;
+            goto reset_flash;
+        case AT49_FLASH_CODE1:
+            if (offset == AT49_MEM_FLASH_ADDR2 && value == AT49_FLASH_CODE2) {
+                DPRINTF("flash code 2\n");
+                pfl->cmd = value;
+                pfl->wcycle++;
+                break;
+            }
+        default:
+            goto error_flash;
+        }
+        return;
+    case 2:
+        DPRINTF("%s: cmd %X\n", __func__, pfl->cmd);
+        switch (pfl->cmd) {
+        case AT49_FLASH_Sector_Erase:
+            if (value == AT49_CMD_READ_ARRAY) {
+                DPRINTF("%s: sector erase finished\n", __func__);
+                goto reset_flash;
+            }
+            break;
+        case AT49_FLASH_CODE2:
+            if (offset == AT49_MEM_FLASH_ADDR1) {
+                switch (value) {
+                case AT49_ID_IN_CODE:
+                    DPRINTF("%s: ident command\n", __func__);
+                    pfl->wcycle = 0;
+                    break;
+                case AT49_FLASH_Setup_Erase:
+                    DPRINTF("%s: erase command\n", __func__);
+                    pfl->wcycle = 0;
+                    break;
+                case AT49_FLASH_Program:
+                    DPRINTF("%s: program command\n", __func__);
+                    pfl->wcycle = 1;
+                    break;
+                case AT49_ID_OUT_CODE:
+                    DPRINTF("%s: ident command finished\n", __func__);
+                    goto reset_flash;
+                default:
+                    goto error_flash;
+                }
+                pfl->cmd = value;
+                break;
+            } else if (value == AT49_FLASH_Sector_Erase) {
+                target_phys_addr_t sect_len = offset < pfl->boot_sect_len * pfl->nb_boot_blocks ?
+                    pfl->boot_sect_len : pfl->sector_len;
+                pfl->cmd = AT49_FLASH_Sector_Erase;
+                p = pfl->storage;
+                DPRINTF("%s: offset " TARGET_FMT_plx "\n", __func__, offset);
+                offset &= ~(sect_len - 1);
+                DPRINTF("%s: block erase at " TARGET_FMT_plx " bytes "
+                        TARGET_FMT_plx "\n",
+                        __func__, offset, sect_len);
+
+                memset(p + offset, 0xff, sect_len);
+                pflash_update(pfl, offset, sect_len);
+                pfl->wcycle = 0;
+                pfl->status |= 0x80; /* Ready! */
+                break;
+            }
+        default:
+            goto error_flash;
+        }
+        return;
+    default:
+        /* Should never happen */
+        DPRINTF("%s: invalid write state\n",  __func__);
+        goto reset_flash;
+    }
+    return;
+
+error_flash:
+    printf("%s: Unimplemented flash cmd sequence "
+           "(offset " TARGET_FMT_plx ", wcycle 0x%x cmd 0x%x value 0x%x)\n",
+           __func__, offset, pfl->wcycle, pfl->cmd, value);
+
+reset_flash:
+    cpu_register_physical_memory(pfl->base, pfl->total_len,
+                                 pfl->off | IO_MEM_ROMD | pfl->fl_mem);
+
+    pfl->bypass = 0;
+    pfl->wcycle = 0;
+    pfl->cmd = 0;
+    return;
+}
+
+
+static uint32_t pflash_readb (void *opaque, target_phys_addr_t addr)
+{
+    return pflash_read(opaque, addr, 1);
+}
+
+static uint32_t pflash_readw (void *opaque, target_phys_addr_t addr)
+{
+    pflash_t *pfl = opaque;
+
+    return pflash_read(pfl, addr, 2);
+}
+
+static uint32_t pflash_readl (void *opaque, target_phys_addr_t addr)
+{
+    pflash_t *pfl = opaque;
+
+    return pflash_read(pfl, addr, 4);
+}
+
+static void pflash_writeb (void *opaque, target_phys_addr_t addr,
+                           uint32_t value)
+{
+    pflash_write(opaque, addr, value, 1);
+}
+
+static void pflash_writew (void *opaque, target_phys_addr_t addr,
+                           uint32_t value)
+{
+    pflash_t *pfl = opaque;
+
+    pflash_write(pfl, addr, value, 2);
+}
+
+static void pflash_writel (void *opaque, target_phys_addr_t addr,
+                           uint32_t value)
+{
+    pflash_t *pfl = opaque;
+
+    pflash_write(pfl, addr, value, 4);
+}
+
+static CPUWriteMemoryFunc * const pflash_write_ops[] = {
+    &pflash_writeb,
+    &pflash_writew,
+    &pflash_writel,
+};
+
+static CPUReadMemoryFunc * const pflash_read_ops[] = {
+    &pflash_readb,
+    &pflash_readw,
+    &pflash_readl,
+};
+
+pflash_t *pflash_cfi_atmel_register(target_phys_addr_t base, ram_addr_t off,
+                                    BlockDriverState *bs,
+                                    uint32_t boot_sect_len,
+                                    int nb_boot_blocks,
+                                    uint32_t sector_len,
+                                    int nb_blocs, int width,
+                                    uint16_t id0, uint16_t id1,
+                                    uint16_t id2, uint16_t id3)
+{
+    pflash_t *pfl;
+    target_phys_addr_t total_len;
+    int ret;
+
+    total_len = boot_sect_len * nb_boot_blocks + sector_len * nb_blocs;
+
+    pfl = qemu_mallocz(sizeof(pflash_t));
+
+    pfl->storage = qemu_get_ram_ptr(off);
+    pfl->fl_mem = cpu_register_io_memory(
+        pflash_read_ops, pflash_write_ops, pfl);
+    pfl->off = off;
+    cpu_register_physical_memory(base, total_len,
+                                 off | pfl->fl_mem | IO_MEM_ROMD);
+
+    pfl->bs = bs;
+    if (pfl->bs) {
+        /* read the initial flash content */
+        ret = bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9);
+        if (ret < 0) {
+            cpu_unregister_io_memory(pfl->fl_mem);
+            qemu_free(pfl);
+            return NULL;
+        }
+    }
+    pfl->ro = 0;
+    pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl);
+    pfl->base = base;
+    pfl->sector_len = sector_len;
+    pfl->nb_blocks = nb_blocs;
+    pfl->boot_sect_len = boot_sect_len;
+    pfl->nb_boot_blocks = nb_boot_blocks;
+    pfl->total_len = total_len;
+    pfl->width = width;
+    pfl->wcycle = 0;
+    pfl->cmd = 0;
+    pfl->status = 0;
+    pfl->ident[0] = id0;
+    pfl->ident[1] = id1;
+    pfl->ident[2] = id2;
+    pfl->ident[3] = id3;
+
+
+    return pfl;
+}