1 files changed, 126 insertions, 0 deletions
diff --git a/bsps/riscv/griscv/console/printk_support.c b/bsps/riscv/griscv/console/printk_support.c
new file mode 100644
index 0000000000..f8c14692c1
--- /dev/null
+++ b/bsps/riscv/griscv/console/printk_support.c
@@ -0,0 +1,126 @@
+/*
+ *  This file contains the TTY driver for the GRLIb APBUART
+ *
+ *  This driver uses the termios pseudo driver.
+ *
+ *  COPYRIGHT (c) 1989-1999.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  Modified for GRLIB BSP.
+ *  COPYRIGHT (c) 2011.
+ *  Aeroflex Gaisler.
+ *
+ *  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 <bsp.h>
+#include <amba.h>
+#include <rtems/libio.h>
+#include <rtems/sysinit.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <stdio.h>
+#include <grlib/apbuart.h>
+#include <grlib/ambapp.h>
+
+int grlib_debug_uart_index __attribute__((weak)) = 0;
+struct apbuart_regs *grlib_debug_uart = NULL;
+
+/* Before UART driver has registered (or when no UART is available), calls to
+ * printk that gets to bsp_out_char() will be filling data into the
+ * pre_printk_dbgbuf[] buffer, hopefully the buffer can help debugging the
+ * early BSP boot.. At least the last printk() will be caught.
+ *
+static char pre_printk_dbgbuf[32] = {0};
+static int pre_printk_pos = 0;
+ */
+
+/* Initialize the BSP system debug console layer. It will scan AMBA Plu&Play
+ * for a debug APBUART and enable RX/TX for that UART.
+ */
+static void bsp_debug_uart_init(void)
+{
+  int i;
+  struct ambapp_dev *adev;
+  struct ambapp_apb_info *apb;
+
+  /* Update grlib_debug_uart_index to index used as debug console. Let user
+   * select Debug console by setting grlib_debug_uart_index. If the BSP is to
+   * provide the default UART (grlib_debug_uart_index==0):
+   *   non-MP: APBUART[0] is debug console
+   *   MP: LEON CPU index select UART
+   */
+  if (grlib_debug_uart_index == 0) {
+#if defined(RTEMS_MULTIPROCESSING)
+    grlib_debug_uart_index = GRLIB_Cpu_Index;
+#else
+    grlib_debug_uart_index = 0;
+#endif
+  } else {
+    grlib_debug_uart_index--; /* User selected dbg-console */
+  }
+
+  /* Find APBUART core for System Debug Console */
+  i = grlib_debug_uart_index;
+  adev = (void *)ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),
+                                 VENDOR_GAISLER, GAISLER_APBUART,
+                                 ambapp_find_by_idx, (void *)&i);
+  if (adev) {
+    /* Found a matching debug console, initialize debug uart if present
+     * for printk
+     */
+    apb = (struct ambapp_apb_info *)adev->devinfo;
+    grlib_debug_uart = (struct apbuart_regs *)apb->start;
+    grlib_debug_uart->ctrl |= APBUART_CTRL_RE | APBUART_CTRL_TE;
+    grlib_debug_uart->status = 0;
+  }
+}
+
+RTEMS_SYSINIT_ITEM(
+  bsp_debug_uart_init,
+  RTEMS_SYSINIT_BSP_START,
+  RTEMS_SYSINIT_ORDER_FOURTH
+);
+
+/* putchar/getchar for printk */
+static void bsp_out_char(char c)
+{
+  if (grlib_debug_uart == NULL) {
+    /* Try to assign standard UART address to debug driver to pass some tests */
+    grlib_debug_uart = (struct apbuart_regs *) 0x80000100;
+    grlib_debug_uart->ctrl |= APBUART_CTRL_RE | APBUART_CTRL_TE;
+    grlib_debug_uart->status = 0;
+    /* Local debug buffer when UART driver has not registered */
+    /*
+    pre_printk_dbgbuf[pre_printk_pos++] = c;
+    pre_printk_pos = pre_printk_pos & (sizeof(pre_printk_dbgbuf)-1);
+    return;
+    */
+  }
+
+  apbuart_outbyte_polled(grlib_debug_uart, c, 1, 1);
+}
+
+/*
+ *  To support printk
+ */
+
+#include <rtems/bspIo.h>
+
+BSP_output_char_function_type BSP_output_char = bsp_out_char;
+
+static int bsp_in_char(void)
+{
+  int tmp;
+
+  if (grlib_debug_uart == NULL)
+    return EOF;
+
+  while ((tmp = apbuart_inbyte_nonblocking(grlib_debug_uart)) < 0)
+    ;
+  return tmp;
+}
+
+BSP_polling_getchar_function_type BSP_poll_char = bsp_in_char;