flash: nor: mdr: implement read/verify for Info memory

This adds necessary code to obtain data from the Info region which is
not memory-mapped so can't be read the usual way.

With this "flash read_bank" and "flash verify_bank" commands should
start to work as expected for the Info memory block.

Change-Id: I57e4b80fff577500cfa85954b625fe9c9ff92aa5
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/3227
Tested-by: jenkins
Reviewed-by: Eldar Khayrullin <eldar.khayrullin@mail.ru>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

diff --git a/src/flash/nor/mdr.c b/src/flash/nor/mdr.c
index 9a19b559bebd3c753bbd895d59d783e1daa46beb..c402e64e2fc3a7a1fd7f94f324e0e20488fbc3bd 100644 (file)
--- a/src/flash/nor/mdr.c
+++ b/src/flash/nor/mdr.c
@@ -474,6 +474,100 @@ free_buffer:
        return retval;
 }
 
+static int mdr_read(struct flash_bank *bank, uint8_t *buffer,
+                   uint32_t offset, uint32_t count)
+{
+       struct target *target = bank->target;
+       struct mdr_flash_bank *mdr_info = bank->driver_priv;
+       int retval, retval2;
+
+       if (!mdr_info->mem_type)
+               return default_flash_read(bank, buffer, offset, count);
+
+       if (bank->target->state != TARGET_HALTED) {
+               LOG_ERROR("Target not halted");
+               return ERROR_TARGET_NOT_HALTED;
+       }
+
+       if (offset & 0x3) {
+               LOG_ERROR("offset 0x%" PRIx32 " breaks required 4-byte alignment", offset);
+               return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
+       }
+
+       if (count & 0x3) {
+               LOG_ERROR("count 0x%" PRIx32 " breaks required 4-byte alignment", count);
+               return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
+       }
+
+       uint32_t flash_cmd, cur_per_clock;
+
+       retval = target_read_u32(target, MD_PER_CLOCK, &cur_per_clock);
+       if (retval != ERROR_OK)
+               goto err;
+
+       if (!(cur_per_clock & MD_PER_CLOCK_RST_CLK)) {
+               /* Something's very wrong if the RST_CLK module is not clocked */
+               LOG_ERROR("Target needs reset before flash operations");
+               retval = ERROR_FLASH_OPERATION_FAILED;
+               goto err;
+       }
+
+       retval = target_write_u32(target, MD_PER_CLOCK, cur_per_clock | MD_PER_CLOCK_EEPROM);
+       if (retval != ERROR_OK)
+               goto err;
+
+       retval = target_write_u32(target, FLASH_KEY, KEY);
+       if (retval != ERROR_OK)
+               goto err;
+
+       retval = target_read_u32(target, FLASH_CMD, &flash_cmd);
+       if (retval != ERROR_OK)
+               goto err_lock;
+
+       /* Switch on register access */
+       flash_cmd = (flash_cmd & FLASH_DELAY_MASK) | FLASH_CON | FLASH_IFREN;
+       retval = target_write_u32(target, FLASH_CMD, flash_cmd);
+       if (retval != ERROR_OK)
+               goto reset_pg_and_lock;
+
+       for (uint32_t i = 0; i < count; i += 4) {
+               retval = target_write_u32(target, FLASH_ADR, offset + i);
+               if (retval != ERROR_OK)
+                       goto reset_pg_and_lock;
+
+               retval = target_write_u32(target, FLASH_CMD, flash_cmd |
+                                         FLASH_XE | FLASH_YE | FLASH_SE);
+               if (retval != ERROR_OK)
+                       goto reset_pg_and_lock;
+
+               uint32_t buf;
+               retval = target_read_u32(target, FLASH_DO, &buf);
+               if (retval != ERROR_OK)
+                       goto reset_pg_and_lock;
+
+               buf_set_u32(buffer, i * 8, 32, buf);
+
+               retval = target_write_u32(target, FLASH_CMD, flash_cmd);
+               if (retval != ERROR_OK)
+                       goto reset_pg_and_lock;
+
+       }
+
+reset_pg_and_lock:
+       flash_cmd &= FLASH_DELAY_MASK;
+       retval2 = target_write_u32(target, FLASH_CMD, flash_cmd);
+       if (retval == ERROR_OK)
+               retval = retval2;
+
+err_lock:
+       retval2 = target_write_u32(target, FLASH_KEY, 0);
+       if (retval == ERROR_OK)
+               retval = retval2;
+
+err:
+       return retval;
+}
+
 static int mdr_probe(struct flash_bank *bank)
 {
        struct mdr_flash_bank *mdr_info = bank->driver_priv;
@@ -527,7 +621,7 @@ struct flash_driver mdr_flash = {
        .erase = mdr_erase,
        .protect = mdr_protect,
        .write = mdr_write,
-       .read = default_flash_read,
+       .read = mdr_read,
        .probe = mdr_probe,
        .auto_probe = mdr_auto_probe,
        .erase_check = default_flash_blank_check,