Move ARM PL011 UART driver

This UART driver is now needed for BSPs other than ARM.

bsps/shared/dev/serial/arm-pl011.c

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2013-2014 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <info@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#include <dev/serial/arm-pl011.h>
+
+static volatile pl011 *pl011_get_regs(rtems_termios_device_context *base)
+{
+  arm_pl011_context *ctx = (arm_pl011_context *) base;
+
+  return ctx->regs;
+}
+
+
+bool arm_pl011_probe(rtems_termios_device_context *base)
+{
+  volatile pl011 *regs = pl011_get_regs(base);
+
+  regs->uartlcr_h = PL011_UARTLCR_H_WLEN(PL011_UARTLCR_H_WLEN_8);
+  regs->uartcr = PL011_UARTCR_RXE
+    | PL011_UARTCR_TXE
+    | PL011_UARTCR_UARTEN;
+
+  return true;
+}
+
+static bool pl011_first_open(
+  struct rtems_termios_tty *tty,
+  rtems_termios_device_context *base,
+  struct termios *term,
+  rtems_libio_open_close_args_t *args
+)
+{
+  arm_pl011_context *ctx = (arm_pl011_context *) base;
+
+  rtems_termios_set_initial_baud(tty, ctx->initial_baud);
+
+  return true;
+}
+
+static int pl011_read_polled(rtems_termios_device_context *base)
+{
+  volatile pl011 *regs = pl011_get_regs(base);
+
+  if ((regs->uartfr & PL011_UARTFR_RXFE) != 0) {
+    return -1;
+  } else {
+    return PL011_UARTDR_DATA_GET(regs->uartdr);
+  }
+}
+
+void arm_pl011_write_polled(rtems_termios_device_context *base, char c)
+{
+  volatile pl011 *regs = pl011_get_regs(base);
+
+  while ((regs->uartfr & PL011_UARTFR_TXFF) != 0) {
+    /* Wait */
+  }
+
+  regs->uartdr = PL011_UARTDR_DATA(c);
+}
+
+static void pl011_write_support_polled(
+  rtems_termios_device_context *base,
+  const char *s,
+  size_t n
+)
+{
+  size_t i;
+
+  for (i = 0; i < n; ++i) {
+    arm_pl011_write_polled(base, s[i]);
+  }
+}
+
+const rtems_termios_device_handler arm_pl011_fns = {
+  .first_open = pl011_first_open,
+  .poll_read = pl011_read_polled,
+  .write = pl011_write_support_polled,
+  .mode = TERMIOS_POLLED
+};