boards/qemu-i486: Add support to QEMU VGA framebuffer

This commits initializes the VGA LCD interface as a framebuffer to
use with fb command.

Signed-off-by: Alan C. Assis <acassis@gmail.com>

boards/x86/qemu/qemu-i486/configs/vga_fb/defconfig

@@ -0,0 +1,57 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+CONFIG_16550_ADDRWIDTH=16
+CONFIG_16550_SUPRESS_CONFIG=y
+CONFIG_16550_UART0=y
+CONFIG_16550_UART0_BASE=0x3f8
+CONFIG_16550_UART0_BAUD=57600
+CONFIG_16550_UART0_CLOCK=16000000
+CONFIG_16550_UART0_IRQ=36
+CONFIG_16550_UART0_SERIAL_CONSOLE=y
+CONFIG_16550_UART=y
+CONFIG_ARCH="x86"
+CONFIG_ARCH_BOARD="qemu-i486"
+CONFIG_ARCH_BOARD_QEMU_I486=y
+CONFIG_ARCH_CHIP="qemu"
+CONFIG_ARCH_CHIP_QEMU_I486=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARCH_X86=y
+CONFIG_ARCH_X86_M32=y
+CONFIG_BOARD_LOOPSPERMSEC=999
+CONFIG_BOOT_RUNFROMEXTSRAM=y
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DRIVERS_VIDEO=y
+CONFIG_EXAMPLES_FB=y
+CONFIG_EXAMPLES_HELLO=y
+CONFIG_FS_FAT=y
+CONFIG_FS_PROCFS=y
+CONFIG_FS_ROMFS=y
+CONFIG_IDLETHREAD_STACKSIZE=2048
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_LCD=y
+CONFIG_LCD_FRAMEBUFFER=y
+CONFIG_LINE_MAX=64
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_DISABLE_IFUPDOWN=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_READLINE=y
+CONFIG_PTHREAD_MUTEX_TYPES=y
+CONFIG_QEMU_VGA=y
+CONFIG_RAM_SIZE=1048576
+CONFIG_RAM_START=0x00100000
+CONFIG_READLINE_CMD_HISTORY=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=3
+CONFIG_START_MONTH=3
+CONFIG_START_YEAR=2011
+CONFIG_SYSTEM_NSH=y
+CONFIG_TESTING_OSTEST=y
+CONFIG_VIDEO_FB=y

boards/x86/qemu/qemu-i486/src/Makefile

@@ -27,5 +27,8 @@ CSRCS = qemu_boot.c
 ifeq ($(CONFIG_BOARDCTL),y)
   CSRCS += qemu_appinit.c
 endif
+ifeq ($(CONFIG_QEMU_VGA),y)
+  CSRCS += qemu_vga_lcd.c
+endif
 
 include $(TOPDIR)/boards/Board.mk

boards/x86/qemu/qemu-i486/src/qemu_appinit.c

@@ -30,8 +30,10 @@
 
 #include <stdio.h>
 #include <nuttx/debug.h>
+#include <nuttx/video/fb.h>
 
 #include "x86_internal.h"
+#include "qemu_vga.h"
 
 /****************************************************************************
  * Public Functions
@@ -77,6 +79,24 @@ int board_app_initialize(uintptr_t arg)
     }
 #endif
 
+#ifdef CONFIG_QEMU_VGA
+  ret = qemu_vga();
+  if (ret < 0)
+    {
+      serr("ERROR: Failed to initialize QEMU VGA: %d\n", ret);
+    }
+#endif
+
+#ifdef CONFIG_VIDEO_FB
+  /* Initialize and register the framebuffer driver */
+
+  ret = fb_register(0, 0);
+  if (ret < 0)
+    {
+      serr("ERROR: fb_register() failed: %d\n", ret);
+    }
+#endif
+
   return ret;
 }
 #endif /* CONFIG_BOARDCTL */

boards/x86/qemu/qemu-i486/src/qemu_vga_lcd.c

@@ -0,0 +1,101 @@
+/****************************************************************************
+ * boards/x86/qemu/qemu-i486/src/qemu_vga_lcd.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <nuttx/debug.h>
+#include <errno.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/board.h>
+#include <nuttx/lcd/lcd.h>
+
+#include "qemu_vga.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+struct lcd_dev_s *g_lcddev;
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_lcd_initialize
+ ****************************************************************************/
+
+int board_lcd_initialize(void)
+{
+  g_lcddev = qemu_vga_initialize();
+  if (!g_lcddev)
+    {
+      lcderr("ERROR: Failed to get the VGA LCD device\n");
+    }
+  else
+    {
+      lcdinfo("VGA LCD Initialized\n");
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: board_lcd_getdev
+ ****************************************************************************/
+
+struct lcd_dev_s *board_lcd_getdev(int lcddev)
+{
+  if (!g_lcddev)
+    {
+      lcderr("ERROR: VGA LCD was not initialized\n");
+    }
+  else
+    {
+      lcdinfo("Returning the lcd_dev\n");
+
+      return g_lcddev;
+    }
+
+  return NULL;
+}
+
+/****************************************************************************
+ * Name: board_lcd_uninitialize
+ ****************************************************************************/
+
+void board_lcd_uninitialize(void)
+{
+  /* TO-FIX */
+}
+