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

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This commit is contained in:
Aaron Lindsay
2012-09-07 23:51:04 -04:00
parent 4be5ceeec6
commit 84dd295956
6 changed files with 82 additions and 0 deletions
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1
Makefile
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@@ -21,6 +21,7 @@ KOBJS =
include boot/Makefile.inc
include kernel/Makefile.inc
include devices/Makefile.inc
all: aedrix-kernel
#all:

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

13
devices/pl011.c Normal file
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@@ -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;
}

55
devices/pl110.c Normal file
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@@ -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;
}

6
include/devices/pl011.h Normal file
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@@ -0,0 +1,6 @@
#ifndef PL011_H
#define PL011_H
void pl011_putc(char c);
#endif /* PL011_H */

3
include/devices/pl110.h Normal file
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@@ -0,0 +1,3 @@
#include <framebuffer.h>
int pl110_init(struct fb *f, unsigned int color_depth);