Pi: Add GPIO controls to Raspberry Pi Haiku Loader

* When first32k.bin is added in front of haiku_loader,
  the OK led comes on verifying haiku_loader is actually
  running on the Pi.

build/jam/board/raspberry_pi/BoardSetup

@@ -56,9 +56,6 @@ fi" ;
 
 HAIKU_BOARD_SDIMAGE_FILES = 
 	haiku_loader
-	haiku_loader.ub
-	haiku_loader_nbsd.ub
-	$(HAIKU_BOARD_SDIMAGE_UBOOT_SCRIPT_NAME)
 ;
 
 

src/system/boot/platform/raspberrypi_arm/Jamfile

@@ -30,6 +30,7 @@ KernelMergeObject boot_platform_raspberrypi_arm.o :
 	cpu.cpp
 	debug.cpp
 	devices.cpp
+	gpio.cpp
 	keyboard.cpp
 	menu.cpp
 	mmu.cpp

src/system/boot/platform/raspberrypi_arm/gpio.cpp

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2011-2012 Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Alexander von Gluck, [email protected]
+ */
+
+
+#include "gpio.h"
+
+
+void
+gpio_init()
+{
+	// Set up pointer to Raspberry Pi GPIO base
+	gGPIOBase = (volatile unsigned *)GPIO_BASE;
+
+	// Take control of general use pins, status led, uart
+	int pin = 0;
+	for (pin = 14; pin <= 25; pin++) {
+		GPIO_IN(pin);
+		GPIO_OUT(pin);
+	}
+}

src/system/boot/platform/raspberrypi_arm/gpio.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2011-2012 Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Alexander von Gluck, [email protected]
+ */
+#ifndef _SYSTEM_BOOT_PLATFORM_PI_GPIO_H
+#define _SYSTEM_BOOT_PLATFORM_PI_GPIO_H
+
+
+#include <arch/arm/bcm2708.h>
+
+
+// Macros for easy GPIO pin access in loader
+#define GPIO_IN(g) *(gGPIOBase + ((g)/10)) &= ~(7<<(((g)%10)*3))
+#define GPIO_OUT(g) *(gGPIOBase + ((g)/10)) |=  (1<<(((g)%10)*3))
+#define GPIO_SET(g) *(gGPIOBase + 7) = (1<<g)
+#define GPIO_CLR(g) *(gGPIOBase + 10) = (1<<g)
+
+
+volatile unsigned *gGPIOBase;
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+void gpio_init();
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* _SYSTEM_BOOT_PLATFORM_PI_GPIO_H */

src/system/boot/platform/raspberrypi_arm/serial.h

@@ -24,4 +24,4 @@ extern void serial_enable(void);
 #endif
 
 
-#endif /* _SYSTEM_BOOT_PLATFORM_ROUTERBOARD_MIPSEL_SERIAL_H */
+#endif /* _SYSTEM_BOOT_PLATFORM_PI_SERIAL_H */

src/system/boot/platform/raspberrypi_arm/start.c

@@ -5,11 +5,12 @@
  */
 
 
-#include "serial.h"
 #include "console.h"
 #include "cpu.h"
-#include "mmu.h"
+#include "gpio.h"
 #include "keyboard.h"
+#include "mmu.h"
+#include "serial.h"
 
 #include <KernelExport.h>
 #include <boot/platform.h>
@@ -33,6 +34,9 @@ extern int main(stage2_args *args);
 void _start(void);
 
 
+volatile unsigned *gGPIOBase;
+
+
 static void
 clear_bss(void)
 {
@@ -104,6 +108,11 @@ pi_start(void)
 	call_ctors();
 
 	cpu_init();
+	gpio_init();
+
+	// Flick on "OK" led
+	GPIO_CLR(16);
+
 	mmu_init();
 	serial_init();
 	console_init();