cfi_flash: enable M18 flash chips family support.

Added new command set ID. Buffered write command processing is changed
in order to support M18 flash chips family.

Signed-off-by: Alexey Korolev <akorolev@infradead.org>
Signed-off-by: Vasiliy Leonenko <vasiliy.leonenko@mail.ru>

drivers/mtd/cfi_flash.c

@@ -76,7 +76,9 @@
 #define FLASH_CMD_PROTECT_SET		0x01
 #define FLASH_CMD_PROTECT_CLEAR		0xD0
 #define FLASH_CMD_CLEAR_STATUS		0x50
+#define FLASH_CMD_READ_STATUS		0x70
 #define FLASH_CMD_WRITE_TO_BUFFER	0xE8
+#define FLASH_CMD_WRITE_BUFFER_PROG	0xE9
 #define FLASH_CMD_WRITE_BUFFER_CONFIRM	0xD0
 
 #define FLASH_STATUS_DONE		0x80
@@ -136,6 +138,7 @@
 #define CFI_CMDSET_MITSU_STANDARD	256
 #define CFI_CMDSET_MITSU_EXTENDED	257
 #define CFI_CMDSET_SST			258
+#define CFI_CMDSET_INTEL_PROG_REGIONS	512
 
 #ifdef CFG_FLASH_CFI_AMD_RESET /* needed for STM_ID_29W320DB on UC100 */
 # undef  FLASH_CMD_RESET
@@ -613,6 +616,7 @@ static int flash_is_busy (flash_info_t * info, flash_sect_t sect)
 	int retval;
 
 	switch (info->vendor) {
+	case CFI_CMDSET_INTEL_PROG_REGIONS:
 	case CFI_CMDSET_INTEL_STANDARD:
 	case CFI_CMDSET_INTEL_EXTENDED:
 		retval = !flash_isset (info, sect, 0, FLASH_STATUS_DONE);
@@ -672,6 +676,7 @@ static int flash_full_status_check (flash_info_t * info, flash_sect_t sector,
 
 	retcode = flash_status_check (info, sector, tout, prompt);
 	switch (info->vendor) {
+	case CFI_CMDSET_INTEL_PROG_REGIONS:
 	case CFI_CMDSET_INTEL_EXTENDED:
 	case CFI_CMDSET_INTEL_STANDARD:
 		if ((retcode == ERR_OK)
@@ -800,6 +805,7 @@ static int flash_write_cfiword (flash_info_t * info, ulong dest,
 	flag = disable_interrupts ();
 
 	switch (info->vendor) {
+	case CFI_CMDSET_INTEL_PROG_REGIONS:
 	case CFI_CMDSET_INTEL_EXTENDED:
 	case CFI_CMDSET_INTEL_STANDARD:
 		flash_write_cmd (info, 0, 0, FLASH_CMD_CLEAR_STATUS);
@@ -854,6 +860,7 @@ static int flash_write_cfibuffer (flash_info_t * info, ulong dest, uchar * cp,
 	int flag = 0;
 	uint offset = 0;
 	unsigned int shift;
+	uchar write_cmd;
 
 	switch (info->portwidth) {
 	case FLASH_CFI_8BIT:
@@ -908,10 +915,14 @@ static int flash_write_cfibuffer (flash_info_t * info, ulong dest, uchar * cp,
 	sector = find_sector (info, dest);
 
 	switch (info->vendor) {
+	case CFI_CMDSET_INTEL_PROG_REGIONS:
 	case CFI_CMDSET_INTEL_STANDARD:
 	case CFI_CMDSET_INTEL_EXTENDED:
+		write_cmd = (info->vendor == CFI_CMDSET_INTEL_PROG_REGIONS) ?
+					FLASH_CMD_WRITE_BUFFER_PROG : FLASH_CMD_WRITE_TO_BUFFER;
 		flash_write_cmd (info, sector, 0, FLASH_CMD_CLEAR_STATUS);
-		flash_write_cmd (info, sector, 0, FLASH_CMD_WRITE_TO_BUFFER);
+		flash_write_cmd (info, sector, 0, FLASH_CMD_READ_STATUS);
+		flash_write_cmd (info, sector, 0, write_cmd);
 		retcode = flash_status_check (info, sector,
 					      info->buffer_write_tout,
 					      "write to buffer");
@@ -961,7 +972,7 @@ static int flash_write_cfibuffer (flash_info_t * info, ulong dest, uchar * cp,
 #endif
 		flash_write_cmd(info, sector, offset, AMD_CMD_WRITE_TO_BUFFER);
 		cnt = len >> shift;
-		flash_write_cmd(info, sector, offset, cnt - 1);
+		flash_write_cmd(info, sector, offset, (uchar)cnt - 1);
 
 		switch (info->portwidth) {
 		case FLASH_CFI_8BIT:
@@ -1046,6 +1057,7 @@ int flash_erase (flash_info_t * info, int s_first, int s_last)
 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) { /* not protected */
 			switch (info->vendor) {
+			case CFI_CMDSET_INTEL_PROG_REGIONS:
 			case CFI_CMDSET_INTEL_STANDARD:
 			case CFI_CMDSET_INTEL_EXTENDED:
 				flash_write_cmd (info, sect, 0,
@@ -1114,6 +1126,9 @@ void flash_print_info (flash_info_t * info)
 			info->size >> 20, info->sector_count);
 	printf ("  ");
 	switch (info->vendor) {
+		case CFI_CMDSET_INTEL_PROG_REGIONS:
+			printf ("Intel Prog Regions");
+			break;
 		case CFI_CMDSET_INTEL_STANDARD:
 			printf ("Intel Standard");
 			break;
@@ -1504,6 +1519,7 @@ static void flash_read_jedec_ids (flash_info_t * info)
 	info->device_id2      = 0;
 
 	switch (info->vendor) {
+	case CFI_CMDSET_INTEL_PROG_REGIONS:
 	case CFI_CMDSET_INTEL_STANDARD:
 	case CFI_CMDSET_INTEL_EXTENDED:
 		cmdset_intel_read_jedec_ids(info);
@@ -1558,6 +1574,7 @@ static int flash_detect_legacy(ulong base, int banknum)
 		}
 
 		switch(info->vendor) {
+		case CFI_CMDSET_INTEL_PROG_REGIONS:
 		case CFI_CMDSET_INTEL_STANDARD:
 		case CFI_CMDSET_INTEL_EXTENDED:
 			info->cmd_reset = FLASH_CMD_RESET;
@@ -1753,6 +1770,7 @@ ulong flash_get_size (ulong base, int banknum)
 #endif
 
 		switch (info->vendor) {
+		case CFI_CMDSET_INTEL_PROG_REGIONS:
 		case CFI_CMDSET_INTEL_STANDARD:
 		case CFI_CMDSET_INTEL_EXTENDED:
 			cmdset_intel_init(info, &qry);
@@ -1830,6 +1848,7 @@ ulong flash_get_size (ulong base, int banknum)
 				 * supported devices (intel...)
 				 */
 				switch (info->vendor) {
+				case CFI_CMDSET_INTEL_PROG_REGIONS:
 				case CFI_CMDSET_INTEL_EXTENDED:
 				case CFI_CMDSET_INTEL_STANDARD:
 					info->protect[sect_cnt] =