Pi uart: Begin first attempts at UART communication on Pi.

* Make Kernel ARM UART slightly more generic
  through (BOARD_UART_CLOCK) configured per board
* Add initial Raspberry Pi serial code
* Still rough and non-working

headers/private/kernel/arch/arm/board/beagle/board_config.h

@@ -5,6 +5,7 @@
 #ifndef _BOARD_OVERO_BOARD_CONFIG_H
 #define _BOARD_OVERO_BOARD_CONFIG_H
 
+
 #define BOARD_NAME_PRETTY "Beagle Board"
 
 #define BOARD_CPU_TYPE_OMAP 1
@@ -12,10 +13,15 @@
 
 #include <arch/arm/omap3.h>
 
+// UART Settings
 #define BOARD_UART1_BASE OMAP_UART1_BASE
 #define BOARD_UART2_BASE OMAP_UART2_BASE
 #define BOARD_UART3_BASE OMAP_UART3_BASE
 
 #define BOARD_DEBUG_UART 2
 
+#define BOARD_UART_CLOCK 48000000
+	// 48MHz (APLL96/2)
+
+
 #endif /* _BOARD_OVERO_BOARD_CONFIG_H */

headers/private/kernel/arch/arm/board/neo_freerunner/board_config.h

@@ -5,6 +5,7 @@
 #ifndef _BOARD_FREERUNNER_BOARD_CONFIG_H
 #define _BOARD_FREERUNNER_BOARD_CONFIG_H
 
+
 #define BOARD_NAME_PRETTY "Openmoko Neo FreeRunner"
 
 #define BOARD_CPU_TYPE_ARM9 1
@@ -12,10 +13,15 @@
 
 #include <arch/arm/arm920t.h>
 
+// UART Settings
 #define BOARD_UART1_BASE UART0_BASE
 #define BOARD_UART2_BASE UART1_BASE
 #define BOARD_UART3_BASE UART2_BASE
 
 #define BOARD_DEBUG_UART 2
 
+#define BOARD_UART_CLOCK 48000000
+	// 48MHz (APLL96/2)
+
+
 #endif /* _BOARD_FREERUNNER_BOARD_CONFIG_H */

headers/private/kernel/arch/arm/board/overo/board_config.h

@@ -5,6 +5,7 @@
 #ifndef _BOARD_OVERO_BOARD_CONFIG_H
 #define _BOARD_OVERO_BOARD_CONFIG_H
 
+
 #define BOARD_NAME_PRETTY "Gumstix Overo"
 
 #define BOARD_CPU_TYPE_OMAP 1
@@ -12,10 +13,15 @@
 
 #include <arch/arm/omap3.h>
 
+// UART Settings
 #define BOARD_UART1_BASE OMAP_UART1_BASE
 #define BOARD_UART2_BASE OMAP_UART2_BASE
 #define BOARD_UART3_BASE OMAP_UART3_BASE
 
 #define BOARD_DEBUG_UART 2
 
+#define BOARD_UART_CLOCK 48000000
+	// 48MHz (APLL96/2)
+
+
 #endif /* _BOARD_OVERO_BOARD_CONFIG_H */

headers/private/kernel/arch/arm/board/raspberry_pi/board_config.h

@@ -15,12 +15,15 @@
 
 #include <arch/arm/bcm2708.h>
 
+// UART Settings
 #define BOARD_UART1_BASE UART0_BASE
 #define BOARD_UART2_BASE UART1_BASE
-#define BOARD_UART3_BASE UART1_BASE
+#define BOARD_UART3_BASE 0
-#warning NO UART3!!!
 
 #define BOARD_DEBUG_UART 0
 
+#define BOARD_UART_CLOCK 125000000
+	/* 125Mhz, strange */
+
 
 #endif /* _BOARD_RASPBERRY_PI_BOARD_CONFIG_H */

headers/private/kernel/arch/arm/board/verdex/board_config.h

@@ -5,6 +5,7 @@
 #ifndef _BOARD_VERDEX_BOARD_CONFIG_H
 #define _BOARD_VERDEX_BOARD_CONFIG_H
 
+
 #define BOARD_NAME_PRETTY "Gumstix Verdex"
 
 #define BOARD_CPU_TYPE_PXA 1
@@ -12,10 +13,15 @@
 
 #include <arch/arm/pxa270.h>
 
+// UART Settings
 #define BOARD_UART1_BASE FFUART_BASE
 #define BOARD_UART2_BASE BTUART_BASE
 #define BOARD_UART3_BASE STUART_BASE
 
 #define BOARD_DEBUG_UART 0
 
+#define BOARD_UART_CLOCK 48000000
+	// 48MHz (APLL96/2)
+
+
 #endif /* _BOARD_VERDEX_BOARD_CONFIG_H */

src/system/boot/platform/raspberrypi_arm/Jamfile

@@ -17,12 +17,6 @@ UsePrivateHeaders [ FDirName storage ] ;
 
 SEARCH_SOURCE += [ FDirName $(HAIKU_TOP) src add-ons accelerants common ] ;
 
-local genericPlatformSources =
-	text_menu.cpp
-#	video_blit.cpp
-#	video_splash.cpp
-;
-
 KernelMergeObject boot_platform_raspberrypi_arm.o :
 	entry.S
 	start.c

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

@@ -16,9 +16,9 @@ gpio_init()
 	// Set up pointer to Raspberry Pi GPIO base
 	gGPIOBase = (volatile unsigned *)GPIO_BASE;
 
-	// Take control of general use pins, status led, uart
+	// Take control of ok led and general use pins
 	int pin = 0;
-	for (pin = 14; pin <= 25; pin++) {
+	for (pin = 16; pin <= 25; pin++) {
 		GPIO_IN(pin);
 		GPIO_OUT(pin);
 	}

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

@@ -1,10 +1,14 @@
 /*
+ * Copyright 2004-2008, Axel D??rfler, [email protected].
+ * Distributed under the terms of the MIT License.
+ *
  * Copyright 2009 Jonas Sundström, [email protected]
  * All rights reserved. Distributed under the terms of the MIT License.
  */
 
 
 #include "serial.h"
+#include "uart.h"
 
 #include <boot/platform.h>
 #include <arch/cpu.h>
@@ -13,31 +17,57 @@
 #include <string.h>
 
 
+static int32 sSerialEnabled = 0;
+
+static char sBuffer[16384];
+static uint32 sBufferPosition;
+
+
 static void
 serial_putc(char c)
 {
-#warning IMPLEMENT serial_putc
+	uart_putc(uart_debug_port(), c);
 }
 
 
 extern "C" void
 serial_puts(const char* string, size_t size)
 {
-#warning IMPLEMENT serial_puts
+	if (sSerialEnabled <= 0)
+		return;
+
+	if (sBufferPosition + size < sizeof(sBuffer)) {
+		memcpy(sBuffer + sBufferPosition, string, size);
+		sBufferPosition += size;
+	}
+
+	while (size-- != 0) {
+		char c = string[0];
+
+		if (c == '\n') {
+			serial_putc('\r');
+			serial_putc('\n');
+		} else if (c != '\r')
+			serial_putc(c);
+
+		string++;
+	}
 }
 
 
-extern "C" void 
+extern "C" void
 serial_disable(void)
 {
-#warning IMPLEMENT serial_disable
+	sSerialEnabled--;
 }
 
 
-extern "C" void 
+extern "C" void
 serial_enable(void)
 {
-#warning IMPLEMENT serial_enable
+	uart_init_early();
+	uart_init();
+	sSerialEnabled++;
 }
 
 
@@ -51,6 +81,8 @@ serial_cleanup(void)
 extern "C" void
 serial_init(void)
 {
-#warning IMPLEMENT serial_init
+	serial_enable();
+
+	serial_putc('S');
 }
 

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

@@ -116,7 +116,6 @@ pi_start(void)
 	mmu_init();
 	serial_init();
 	console_init();
-	serial_enable();
 
 	args.heap_size = HEAP_SIZE;
 	args.arguments = NULL;

src/system/kernel/arch/arm/uart.cpp

@@ -95,18 +95,17 @@ static inline unsigned char read_uart_reg(int port, uint reg)
 #define MCRVAL (MCR_DTR | MCR_RTS)	/* RTS/DTR */
 #define FCRVAL (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR) /* Clear & enable FIFOs */
 
-#define V_NS16550_CLK            (48000000) /* 48MHz (APLL96/2) */
-
 
 int uart_debug_port(void)
 {
 	return DEBUG_UART;
 }
 
+
 void uart_init_port(int port, uint baud)
 {
 	/* clear the tx & rx fifo and disable */
-	uint16 baud_divisor = (V_NS16550_CLK / 16 / baud);
+	uint16 baud_divisor = (BOARD_UART_CLOCK / 16 / baud);
 
 	write_uart_reg(port, UART_IER, 0);
 	write_uart_reg(port, UART_LCR, LCR_BKSE | LCRVAL); // config mode A