Add devices directory, and PL011 and PL110 basic (very!) device drivers

Makefile

@@ -21,6 +21,7 @@ KOBJS =
 
 include boot/Makefile.inc
 include kernel/Makefile.inc
+include devices/Makefile.inc
 
 all: aedrix-kernel
 #all: 

devices/Makefile.inc

@@ -0,0 +1,4 @@
+DEVICES_PREFIX = devices
+
+KOBJS += $(DEVICES_PREFIX)/pl110.o
+KOBJS += $(DEVICES_PREFIX)/pl011.o

devices/pl011.c

@@ -0,0 +1,13 @@
+#define PL011_SERIAL_BASE 0x16000000
+#define PL011_SERIAL_FLAG_REGISTER 0x18
+#define PL011_SERIAL_BUFFER_FULL (1 << 5)
+
+void pl011_putc(char c)
+{
+    /* Wait until the serial buffer is empty */
+    while (*(volatile unsigned long*)(PL011_SERIAL_BASE + PL011_SERIAL_FLAG_REGISTER)
+		    & (PL011_SERIAL_BUFFER_FULL));
+
+    /* When it's empty, put our character at the base */
+    *(volatile unsigned long*)PL011_SERIAL_BASE = c;
+}

devices/pl110.c

@@ -0,0 +1,55 @@
+#include <framebuffer.h>
+
+typedef unsigned int		uint32;
+
+#define PL110_CR_EN		0x001
+#define PL110_CR_PWR		0x800
+#define PL110_IOBASE		0xc0000000
+#define PL110_PALBASE		(PL110_IOBASE + 0x200)
+#define PL110_FB_BASE		0x200000;
+
+struct pl110_control {
+	uint32	volatile timing0;	//0
+	uint32	volatile timing1;	//4
+	uint32	volatile timing2;	//8
+	uint32	volatile timing3;	//c
+	uint32	volatile upbase;	//10
+	uint32	volatile lpbase;	//14
+	uint32	volatile intrenable;	//18
+	uint32	volatile control;	//1c
+};
+
+struct fbdev pl110_fb_device;
+
+int pl110_init(struct fb *f, unsigned int color_depth) {
+	struct pl110_control *plio = (struct pl110_control*)PL110_IOBASE;
+
+	/* 640x480 pixels */
+	plio->timing0 = 0x3f1f3f9c;
+	plio->timing1 = 0x080b61df;
+	plio->upbase = PL110_FB_BASE;
+
+	if (color_depth == FB_COLOR_DEPTH_8) {
+		plio->control = 0x1827;
+	} else if (color_depth == FB_COLOR_DEPTH_16) {
+		plio->control = 0x1829;
+	} else if (color_depth == FB_COLOR_DEPTH_24) {
+		plio->control = 0x182B;
+	} else {
+		//assume 16 if nothing else fit
+		color_depth = 16;
+		plio->control = 0x1829;
+	}
+
+	f->device = &pl110_fb_device;
+	f->device->fbaddr = (void*)PL110_FB_BASE;
+	f->width = 640;
+	f->device->pixelwidth = 640;
+	f->height = 480;
+	f->device->pixelheight = 480;
+
+	f->color_depth = color_depth;
+	f->device->color_depth = color_depth;
+
+	return 0;
+}

include/devices/pl011.h

@@ -0,0 +1,6 @@
+#ifndef PL011_H
+#define PL011_H
+
+void pl011_putc(char c);
+
+#endif /* PL011_H */

include/devices/pl110.h

@@ -0,0 +1,3 @@
+#include <framebuffer.h>
+
+int pl110_init(struct fb *f, unsigned int color_depth);