dev/serial: Add Zynq UART kernel I/O support

Replace the BSP_CONSOLE_MINOR BSP option for the Xilinx Zynq BSPs with the new
BSP option ZYNQ_UART_KERNEL_IO_BASE_ADDR.  Move the kernel I/O support to a
shared file.

1 files changed, 88 insertions, 0 deletions

diff --git a/bsps/shared/dev/serial/zynq-uart-kernel-io.c b/bsps/shared/dev/serial/zynq-uart-kernel-io.c
new file mode 100644
index 0000000000..61b1043cd2
--- /dev/null
+++ b/bsps/shared/dev/serial/zynq-uart-kernel-io.c
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup zynq_uart
+ *
+ * @brief This source file contains the definition of ::BSP_output_char and
+ *   ::BSP_poll_char.
+ */
+
+/*
+ * Copyright (C) 2013, 2024 embedded brains GmbH & Co. KG
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <rtems/bspIo.h>
+
+#include <bsp.h>
+#include <dev/serial/zynq-uart-regs.h>
+#include <rtems/sysinit.h>
+
+static void zynq_uart_kernel_output_char(char c)
+{
+  volatile zynq_uart *regs =
+    (volatile zynq_uart *) ZYNQ_UART_KERNEL_IO_BASE_ADDR;
+
+  zynq_uart_write_char_polled(regs, c);
+}
+
+static int zynq_uart_kernel_poll_char(void)
+{
+  volatile zynq_uart *regs =
+    (volatile zynq_uart *) ZYNQ_UART_KERNEL_IO_BASE_ADDR;
+
+  return zynq_uart_read_char_polled(regs);
+}
+
+static void zynq_uart_kernel_early_init(char c);
+
+static void zynq_uart_kernel_init(void)
+{
+  volatile zynq_uart *regs =
+    (volatile zynq_uart *) ZYNQ_UART_KERNEL_IO_BASE_ADDR;
+
+  if (BSP_output_char != zynq_uart_kernel_early_init) {
+    return;
+  }
+
+  zynq_uart_initialize(regs);
+  BSP_output_char = zynq_uart_kernel_output_char;
+}
+
+static void zynq_uart_kernel_early_init(char c)
+{
+  zynq_uart_kernel_init();
+  zynq_uart_kernel_output_char(c);
+}
+
+BSP_output_char_function_type BSP_output_char = zynq_uart_kernel_early_init;
+
+BSP_polling_getchar_function_type BSP_poll_char = zynq_uart_kernel_poll_char;
+
+RTEMS_SYSINIT_ITEM(
+  zynq_uart_kernel_init,
+  RTEMS_SYSINIT_BSP_START,
+  RTEMS_SYSINIT_ORDER_LAST_BUT_5
+);