[PATCH qemu 07/12] m25p80: add RDCR instruction for Macronix chip

[Cédric Le Goater]

Some Macronix chips, such as the MX25L25635F (0xc22019) used on
OpenPower boxes, have a Read Configuration Register (RDCR)
instruction. This patch adds this new command to the m25p80 object and
exposes the 4BYTE mode.

Signed-off-by: Cédric Le Goater <clg at kaod.org>
---
 hw/block/m25p80.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
index c4aee22eae88..02f77012c21b 100644
--- a/hw/block/m25p80.c
+++ b/hw/block/m25p80.c
@@ -252,6 +252,7 @@ typedef enum {
     WRDI = 0x4,
     RDSR = 0x5,
     WREN = 0x6,
+    RDCR = 0x15,
     JEDEC_READ = 0x9f,
     BULK_ERASE = 0xc7,
     READ_FSR = 0x70,
@@ -708,6 +709,13 @@ static void decode_new_cmd(Flash *s, uint32_t value)
         s->state = STATE_READING_DATA;
         break;
 
+    case RDCR:
+        s->data[0] = (!!s->four_bytes_address_mode) << 5;
+        s->pos = 0;
+        s->len = 1;
+        s->state = STATE_READING_DATA;
+        break;
+
     case READ_FSR:
         s->data[0] = FSR_FLASH_READY;
         if (s->four_bytes_address_mode) {
-- 
2.1.4