bsps: Move console drivers to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

1 files changed, 177 insertions, 0 deletions

diff --git a/bsps/riscv/riscv_generic/console/console-io.c b/bsps/riscv/riscv_generic/console/console-io.c
new file mode 100644
index 0000000000..ded68ef7d2
--- /dev/null
+++ b/bsps/riscv/riscv_generic/console/console-io.c
@@ -0,0 +1,177 @@
+/*
+ * Copyright (c) 2015 University of York.
+ * Hesham Almatary <hesham@alumni.york.ac.uk>
+ *
+ * Copyright (c) 2013, The Regents of the University of California (Regents).
+ * All Rights Reserved.
+ *
+ * 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 AUTHOR 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 AUTHOR 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 <bsp.h>
+#include <bsp/console-polled.h>
+#include <rtems/libio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <stdio.h>
+
+/* Most of the code below is copied from riscv-pk project */
+# define TOHOST_CMD(dev, cmd, payload) \
+  (((uint64_t)(dev) << 56) | ((uint64_t)(cmd) << 48) | (uint64_t)(payload))
+
+#define FROMHOST_DEV(fromhost_value) ((uint64_t)(fromhost_value) >> 56)
+#define FROMHOST_CMD(fromhost_value) ((uint64_t)(fromhost_value) << 8 >> 56)
+#define FROMHOST_DATA(fromhost_value) ((uint64_t)(fromhost_value) << 16 >> 16)
+
+volatile uint64_t tohost __attribute__((section(".htif")));
+volatile uint64_t fromhost __attribute__((section(".htif")));
+volatile int htif_console_buf;
+
+static void __check_fromhost()
+{
+  uint64_t fh = fromhost;
+  if (!fh) {
+    return;
+  }
+  fromhost = 0;
+
+  // this should be from the console
+  assert(FROMHOST_DEV(fh) == 1);
+  switch (FROMHOST_CMD(fh)) {
+  case 0:
+    htif_console_buf = 1 + (uint8_t)FROMHOST_DATA(fh);
+    break;
+  case 1:
+    break;
+  default:
+    assert(0);
+  }
+}
+
+static void __set_tohost(uintptr_t dev, uintptr_t cmd, uintptr_t data)
+{
+  while (tohost) {
+    __check_fromhost();
+  }
+  tohost = TOHOST_CMD(dev, cmd, data);
+}
+
+int htif_console_getchar()
+{
+  __check_fromhost();
+  int ch = htif_console_buf;
+  if (ch >= 0) {
+    htif_console_buf = -1;
+    __set_tohost(1, 0, 0);
+  }
+
+  return ch - 1;
+}
+
+static void do_tohost_fromhost(uintptr_t dev, uintptr_t cmd, uintptr_t data)
+{
+  __set_tohost(dev, cmd, data);
+
+  while (1) {
+    uint64_t fh = fromhost;
+    if (fh) {
+      if (FROMHOST_DEV(fh) == dev && FROMHOST_CMD(fh) == cmd) {
+        fromhost = 0;
+        break;
+      }
+      __check_fromhost();
+    }
+  }
+}
+
+void htif_console_putchar(uint8_t ch)
+{
+  __set_tohost(1, 1, ch);
+}
+
+void htif_poweroff()
+{
+  while (1) {
+    fromhost = 0;
+    tohost = 1;
+  }
+}
+
+void console_initialize_hardware(void)
+{
+  /* Do nothing */
+}
+
+static void outbyte_console(char ch)
+{
+  htif_console_putchar(ch);
+}
+
+static char inbyte_console(void)
+{
+  return htif_console_getchar();
+}
+
+/*
+ *  console_outbyte_polled
+ *
+ *  This routine transmits a character using polling.
+ */
+void console_outbyte_polled(
+  int  port,
+  char ch
+)
+{
+  outbyte_console( ch );
+}
+
+/*
+ *  console_inbyte_nonblocking
+ *
+ *  This routine polls for a character.
+ */
+
+int console_inbyte_nonblocking(int port)
+{
+  char c;
+
+  c = inbyte_console();
+  if (!c) {
+    return -1;
+  }
+  return (int) c;
+}
+
+/*
+ *  To support printk
+ */
+
+#include <rtems/bspIo.h>
+
+static void RISCV_output_char(char c)
+{
+  console_outbyte_polled( 0, c );
+}
+
+BSP_output_char_function_type BSP_output_char = RISCV_output_char;
+BSP_polling_getchar_function_type BSP_poll_char =
+  (void *)console_inbyte_nonblocking;