hw/pflash: use ldn_{be,le}_p and stn_{be,le}_p

Use the helper functions we have to read/write multi-byte values
in correct byte order.

Suggested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240108160900.104835-3-kraxel@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
(cherry picked from commit 5dd58358a57048e5ceabf5c91c0544f4f56afdcd)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/block/pflash_cfi01.c

@@ -225,34 +225,10 @@ static uint32_t pflash_data_read(PFlashCFI01 *pfl, hwaddr offset,
     uint32_t ret;
 
     p = pfl->storage;
-    switch (width) {
-    case 1:
-        ret = p[offset];
-        break;
-    case 2:
-        if (be) {
-            ret = p[offset] << 8;
-            ret |= p[offset + 1];
-        } else {
-            ret = p[offset];
-            ret |= p[offset + 1] << 8;
-        }
-        break;
-    case 4:
-        if (be) {
-            ret = p[offset] << 24;
-            ret |= p[offset + 1] << 16;
-            ret |= p[offset + 2] << 8;
-            ret |= p[offset + 3];
-        } else {
-            ret = p[offset];
-            ret |= p[offset + 1] << 8;
-            ret |= p[offset + 2] << 16;
-            ret |= p[offset + 3] << 24;
-        }
-        break;
-    default:
-        abort();
+    if (be) {
+        ret = ldn_be_p(p + offset, width);
+    } else {
+        ret = ldn_le_p(p + offset, width);
     }
     trace_pflash_data_read(pfl->name, offset, width, ret);
     return ret;
@@ -408,34 +384,11 @@ static inline void pflash_data_write(PFlashCFI01 *pfl, hwaddr offset,
     trace_pflash_data_write(pfl->name, offset, width, value, pfl->counter);
     p = pfl->storage + offset;
 
-    switch (width) {
-    case 1:
-        p[0] = value;
-        break;
-    case 2:
-        if (be) {
-            p[0] = value >> 8;
-            p[1] = value;
-        } else {
-            p[0] = value;
-            p[1] = value >> 8;
-        }
-        break;
-    case 4:
-        if (be) {
-            p[0] = value >> 24;
-            p[1] = value >> 16;
-            p[2] = value >> 8;
-            p[3] = value;
-        } else {
-            p[0] = value;
-            p[1] = value >> 8;
-            p[2] = value >> 16;
-            p[3] = value >> 24;
-        }
-        break;
+    if (be) {
+        stn_be_p(p, width, value);
+    } else {
+        stn_le_p(p, width, value);
     }
-
 }
 
 static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,