[PATCH 3/10] 4BA: Winbond W25Q256.V chip (32MB) declaration, 4-bytes addr mode

[Boris Baykov]

Here is the definition of new W25Q256xV chip with new functions pointers
for 4-bytes addressing reads and writes. Erase functions pointers are
changed in their old places. New feature flags for 4-bytes mode added.

Patched files
-------------
flashchips.c 
+ added definition for Winbond W25Q256BV/W25Q256FV chips

Signed-off-by: Boris Baykov , Russia, Jan 2014
---
diff -U 5 -N ./flashrom/flashchips.c ./flashrom-1868-4ba-3/flashchips.c
--- ./flashrom/flashchips.c     2015-01-11 01:55:15.000000000 +0300
+++ ./flashrom-1868-4ba-3/flashchips.c  2015-01-10 19:14:01.000000000 +0300
@@ -13320,10 +13320,58 @@
                .voltage        = {2700, 3600},
        },

{
                .vendor         = "Winbond",
+               .name           = "W25Q256.V",
+               .bustype        = BUS_SPI,
+               .manufacture_id = WINBOND_NEX_ID,
+               .model_id       = WINBOND_NEX_W25Q256_V,
+               .total_size     = 32768,
+               .page_size      = 256,
+               /* supports SFDP */
+               /* OTP: 1024B total, 256B reserved; read 0x48; write 0x42, erase 0x44, read ID 0x4B */
+               /* FOUR_BYTE_ADDR: supports 4-bytes addressing mode */
+               .feature_bits   = FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA_SUPPORT,
+               .four_bytes_addr_funcs = 
+               {
+                       .enter_4ba = spi_enter_4ba_b7_we, /* enter 4-bytes addressing mode by CMD B7 + WREN */
+                       .read_nbyte = spi_nbyte_read_4ba, /* read from 4-bytes addressing mode */
+                       .program_byte = spi_byte_program_4ba, /* write from 4-bytes addressing mode */
+                       .program_nbyte = spi_nbyte_program_4ba /* write from 4-bytes addressing mode */
+               },
+               .tested         = TEST_OK_PREW,
+               .probe          = probe_spi_rdid,
+               .probe_timing   = TIMING_ZERO,
+               .block_erasers  =
+               {
+                       {
+                               .eraseblocks = { {4 * 1024, 8192} },
+                               .block_erase = spi_block_erase_20_4ba, /* erases 4k from 4-bytes addressing mode */
+                       }, {
+                               .eraseblocks = { {32 * 1024, 1024} },
+                               .block_erase = spi_block_erase_52_4ba, /* erases 32k from 4-bytes addressing mode */
+                       }, {
+                               .eraseblocks = { {64 * 1024, 512} },
+                               .block_erase = spi_block_erase_d8_4ba, /* erases 64k from 4-bytes addressing mode */
+                       }, {
+                               .eraseblocks = { {32 * 1024 * 1024, 1} },
+                               .block_erase = spi_block_erase_60,
+                       }, {
+                               .eraseblocks = { {32 * 1024 * 1024, 1} },
+                               .block_erase = spi_block_erase_c7,
+                       }
+               },
+               .printlock      = spi_prettyprint_status_register_plain, /* TODO: improve */
+               .unlock         = spi_disable_blockprotect,
+               .write          = spi_chip_write_256,
+               .read           = spi_chip_read,
+               .voltage        = {2700, 3600},
+       },
+
+       {
+               .vendor         = "Winbond",
                .name           = "W25Q20.W",
                .bustype        = BUS_SPI,
                .manufacture_id = WINBOND_NEX_ID,
                .model_id       = WINBOND_NEX_W25Q20_W,
                .total_size     = 256,