[PATCH qemu v2 08/10] m25p80: add RDCR instruction for Macronix chip

[Cédric Le Goater]

Some Macronix chips, such as the MX25L25635F used on OpenPower boxes,
have a Read Configuration Register (RDCR) instruction.

Add this new instruction to the m25p80 object and expose 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 3a500ed03c1b..74989ad93612 100644
--- a/hw/block/m25p80.c
+++ b/hw/block/m25p80.c
@@ -254,6 +254,7 @@ typedef enum {
     WRDI = 0x4,
     RDSR = 0x5,
     WREN = 0x6,
+    RDCR = 0x15,
     JEDEC_READ = 0x9f,
     BULK_ERASE = 0xc7,
     READ_FSR = 0x70,
@@ -703,6 +704,13 @@ 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