Add serial on ARC platform.

grub-core/term/arc/serial.c

@@ -0,0 +1,147 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/serial.h>
+#include <grub/types.h>
+#include <grub/dl.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/time.h>
+#include <grub/i18n.h>
+#include <grub/arc/arc.h>
+
+
+static void
+do_real_config (struct grub_serial_port *port)
+{
+  char *name;
+  if (port->configured)
+    return;
+
+  name = grub_arc_alt_name_to_norm (port->name, "");
+
+  if (GRUB_ARC_FIRMWARE_VECTOR->open (name,GRUB_ARC_FILE_ACCESS_OPEN_RW,
+				      &port->handle))
+    port->handle_valid = 0;
+  else
+    port->handle_valid = 1;
+
+  port->configured = 1;
+}
+
+/* Fetch a key.  */
+static int
+serial_hw_fetch (struct grub_serial_port *port)
+{
+  unsigned long actual;
+  char c;
+
+  do_real_config (port);
+
+  if (!port->handle_valid)
+    return -1;
+  if (GRUB_ARC_FIRMWARE_VECTOR->read (port->handle, &c,
+				      1, &actual) || actual <= 0)
+    return -1;
+  return c;
+}
+
+/* Put a character.  */
+static void
+serial_hw_put (struct grub_serial_port *port, const int c)
+{
+  unsigned long actual;
+  char c0 = c;
+
+  do_real_config (port);
+
+  if (!port->handle_valid)
+    return;
+
+  GRUB_ARC_FIRMWARE_VECTOR->write (port->handle, &c0,
+				   1, &actual);
+}
+
+/* Initialize a serial device. PORT is the port number for a serial device.
+   SPEED is a DTE-DTE speed which must be one of these: 2400, 4800, 9600,
+   19200, 38400, 57600 and 115200. WORD_LEN is the word length to be used
+   for the device. Likewise, PARITY is the type of the parity and
+   STOP_BIT_LEN is the length of the stop bit. The possible values for
+   WORD_LEN, PARITY and STOP_BIT_LEN are defined in the header file as
+   macros.  */
+static grub_err_t
+serial_hw_configure (struct grub_serial_port *port __attribute__ ((unused)),
+		     struct grub_serial_config *config __attribute__ ((unused)))
+{
+  /*  FIXME: no ARC serial config available.  */
+
+  return GRUB_ERR_NONE;
+}
+
+struct grub_serial_driver grub_arcserial_driver =
+  {
+    .configure = serial_hw_configure,
+    .fetch = serial_hw_fetch,
+    .put = serial_hw_put
+  };
+
+const char *
+grub_arcserial_add_port (const char *path)
+{
+  struct grub_serial_port *port;
+  grub_err_t err;
+
+  port = grub_zalloc (sizeof (*port));
+  if (!port)
+    return NULL;
+  port->name = grub_strdup (path);
+  if (!port->name)
+    return NULL;
+
+  port->driver = &grub_arcserial_driver;
+  err = grub_serial_config_defaults (port);
+  if (err)
+    grub_print_error ();
+
+  grub_serial_register (port);
+
+  return port->name;
+}
+
+static int
+dev_iterate (const char *name,
+	     const struct grub_arc_component *comp __attribute__ ((unused)),
+	     void *data __attribute__ ((unused)))
+{
+  /* We should check consolein/consoleout flags as
+     well but some implementations are buggy.  */
+  if ((comp->flags & (GRUB_ARC_COMPONENT_FLAG_IN | GRUB_ARC_COMPONENT_FLAG_OUT))
+      != (GRUB_ARC_COMPONENT_FLAG_IN | GRUB_ARC_COMPONENT_FLAG_OUT))
+    return 0;
+  if (!grub_arc_is_device_serial (name, 1))
+    return 0;
+  grub_arcserial_add_port (name);
+  return 0;
+}
+
+void
+grub_arcserial_init (void)
+{
+  grub_arc_iterate_devs (dev_iterate, 0, 1);
+}
+