return status for each NOR flash device

Now that we know how wide each flash device that makes up the bank is,
return status for each device in the bank.  Leave existing code
that treats 32 bit wide banks as composed of two 16 bit devices as otherwise
we may break configurations that do not set the device_width propery.

Signed-off-by: Roy Franz <roy.franz@linaro.org>
Message-id: 1386279359-32286-4-git-send-email-roy.franz@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/hw/block/pflash_cfi01.c b/hw/block/pflash_cfi01.c
index a458ad6..82a2519 100644 (file)
--- a/hw/block/pflash_cfi01.c
+++ b/hw/block/pflash_cfi01.c
@@ -193,9 +193,20 @@ static uint32_t pflash_read (pflash_t *pfl, hwaddr offset,
     case 0x60: /* Block /un)lock */
     case 0x70: /* Status Register */
     case 0xe8: /* Write block */
-        /* Status register read */
+        /* Status register read.  Return status from each device in
+         * bank.
+         */
         ret = pfl->status;
-        if (width > 2) {
+        if (pfl->device_width && width > pfl->device_width) {
+            int shift = pfl->device_width * 8;
+            while (shift + pfl->device_width * 8 <= width * 8) {
+                ret |= pfl->status << shift;
+                shift += pfl->device_width * 8;
+            }
+        } else if (!pfl->device_width && width > 2) {
+            /* Handle 32 bit flash cases where device width is not
+             * set. (Existing behavior before device width added.)
+             */
             ret |= pfl->status << 16;
         }
         DPRINTF("%s: status %x\n", __func__, ret);