[PATCH v3 06/21] sd: emmc: Update CMD8 to send EXT_CSD register

[Sai Pavan Boddu]

From: Vincent Palatin <vpalatin@chromium.org>

Sends the EXT_CSD register as response to CMD8.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
---
 hw/sd/sd.c | 52 ++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 36 insertions(+), 16 deletions(-)

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index a26695b..181e7e2 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -1141,24 +1141,37 @@ static sd_rsp_type_t sd_normal_command(SDState *sd, 
SDRequest req)
         }
         break;
 
-    case 8: /* CMD8:   SEND_IF_COND */
-        if (sd->spec_version < SD_PHY_SPECv2_00_VERS) {
-            break;
-        }
-        if (sd->state != sd_idle_state) {
-            break;
-        }
-        sd->vhs = 0;
-
-        /* No response if not exactly one VHS bit is set.  */
-        if (!(req.arg >> 8) || (req.arg >> (ctz32(req.arg & ~0xff) + 1))) {
-            return sd->spi ? sd_r7 : sd_r0;
-        }
+    case 8:    /* CMD8:   SEND_IF_COND / SEND_EXT_CSD */
+        if (sd->emmc) {
+            switch (sd->state) {
+            case sd_transfer_state:
+                /* MMC : Sends the EXT_CSD register as a Block of data */
+                sd->state = sd_sendingdata_state;
+                memcpy(sd->data, sd->ext_csd, sizeof(sd->ext_csd));
+                sd->data_start = addr;
+                sd->data_offset = 0;
+                return sd_r1;
+            default:
+                break;
+            }
+        } else {
+            if (sd->spec_version < SD_PHY_SPECv2_00_VERS) {
+                break;
+            }
+            if (sd->state != sd_idle_state) {
+                break;
+            }
+            sd->vhs = 0;
 
-        /* Accept.  */
-        sd->vhs = req.arg;
-        return sd_r7;
+            /* No response if not exactly one VHS bit is set.  */
+            if (!(req.arg >> 8) || (req.arg >> (ctz32(req.arg & ~0xff) + 1))) {
+                return sd->spi ? sd_r7 : sd_r0;
+            }
 
+            /* Accept.  */
+            sd->vhs = req.arg;
+            return sd_r7;
+        }
     case 9: /* CMD9:   SEND_CSD */
         switch (sd->state) {
         case sd_standby_state:
@@ -2081,6 +2094,13 @@ uint8_t sd_read_byte(SDState *sd)
             sd->state = sd_transfer_state;
         break;
 
+    case 8:     /* CMD8: SEND_EXT_CSD on MMC */
+        ret = sd->data[sd->data_offset++];
+        if (sd->data_offset >= sizeof(sd->ext_csd)) {
+            sd->state = sd_transfer_state;
+        }
+        break;
+
     case 9:     /* CMD9:   SEND_CSD */
     case 10:    /* CMD10:  SEND_CID */
         ret = sd->data[sd->data_offset ++];
-- 
2.7.4