hw/char/pl011: Extract pl011_read_rxdata() from pl011_read()

To keep MemoryRegionOps read/write handlers with similar logic,
factor pl011_read_txdata() out of pl011_read(), similar to what
the previous commit did to pl011_write().
No functional change intended.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240719181041.49545-8-philmd@linaro.org>

1 files changed, 24 insertions, 17 deletions

diff --git a/hw/char/pl011.c b/hw/char/pl011.c
index ea9115d853..0f9a5cd16d 100644
--- a/hw/char/pl011.c
+++ b/hw/char/pl011.c
@@ -235,31 +235,38 @@ static void pl011_write_txdata(PL011State *s, uint8_t data)
     pl011_update(s);
 }
 
+static uint32_t pl011_read_rxdata(PL011State *s)
+{
+    uint32_t c;
+
+    s->flags &= ~PL011_FLAG_RXFF;
+    c = s->read_fifo[s->read_pos];
+    if (s->read_count > 0) {
+        s->read_count--;
+        s->read_pos = (s->read_pos + 1) & (pl011_get_fifo_depth(s) - 1);
+    }
+    if (s->read_count == 0) {
+        s->flags |= PL011_FLAG_RXFE;
+    }
+    if (s->read_count == s->read_trigger - 1) {
+        s->int_level &= ~INT_RX;
+    }
+    trace_pl011_read_fifo(s->read_count);
+    s->rsr = c >> 8;
+    pl011_update(s);
+    qemu_chr_fe_accept_input(&s->chr);
+    return c;
+}
+
 static uint64_t pl011_read(void *opaque, hwaddr offset,
                            unsigned size)
 {
     PL011State *s = (PL011State *)opaque;
-    uint32_t c;
     uint64_t r;
 
     switch (offset >> 2) {
     case 0: /* UARTDR */
-        s->flags &= ~PL011_FLAG_RXFF;
-        c = s->read_fifo[s->read_pos];
-        if (s->read_count > 0) {
-            s->read_count--;
-            s->read_pos = (s->read_pos + 1) & (pl011_get_fifo_depth(s) - 1);
-        }
-        if (s->read_count == 0) {
-            s->flags |= PL011_FLAG_RXFE;
-        }
-        if (s->read_count == s->read_trigger - 1)
-            s->int_level &= ~ INT_RX;
-        trace_pl011_read_fifo(s->read_count);
-        s->rsr = c >> 8;
-        pl011_update(s);
-        qemu_chr_fe_accept_input(&s->chr);
-        r = c;
+        r = pl011_read_rxdata(s);
         break;
     case 1: /* UARTRSR */
         r = s->rsr;