summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/btext.c
blob: 2bf558a0c568063cc2ca182e7c2379310fedf0f3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
// SPDX-License-Identifier: GPL-2.0
/*
 * Procedures for drawing on the screen early on in the boot process.
 *
 * Benjamin Herrenschmidt <benh@kernel.crashing.org>
 */
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/font.h>

#include <asm/btext.h>
#include <asm/oplib.h>
#include <asm/io.h>

#define NO_SCROLL

#ifndef NO_SCROLL
static void scrollscreen(void);
#endif

static void draw_byte(unsigned char c, long locX, long locY);
static void draw_byte_32(const unsigned char *bits, unsigned int *base, int rb);
static void draw_byte_16(const unsigned char *bits, unsigned int *base, int rb);
static void draw_byte_8(const unsigned char *bits, unsigned int *base, int rb);

#define __force_data __section(".data")

static int g_loc_X __force_data;
static int g_loc_Y __force_data;
static int g_max_loc_X __force_data;
static int g_max_loc_Y __force_data;

static int dispDeviceRowBytes __force_data;
static int dispDeviceDepth  __force_data;
static int dispDeviceRect[4] __force_data;
static unsigned char *dispDeviceBase __force_data;

static int __init btext_initialize(phandle node)
{
	unsigned int width, height, depth, pitch;
	unsigned long address = 0;
	u32 prop;

	if (prom_getproperty(node, "width", (char *)&width, 4) < 0)
		return -EINVAL;
	if (prom_getproperty(node, "height", (char *)&height, 4) < 0)
		return -EINVAL;
	if (prom_getproperty(node, "depth", (char *)&depth, 4) < 0)
		return -EINVAL;
	pitch = width * ((depth + 7) / 8);

	if (prom_getproperty(node, "linebytes", (char *)&prop, 4) >= 0 &&
	    prop != 0xffffffffu)
		pitch = prop;

	if (pitch == 1)
		pitch = 0x1000;

	if (prom_getproperty(node, "address", (char *)&prop, 4) >= 0)
		address = prop;

	/* FIXME: Add support for PCI reg properties. Right now, only
	 * reliable on macs
	 */
	if (address == 0)
		return -EINVAL;

	g_loc_X = 0;
	g_loc_Y = 0;
	g_max_loc_X = width / 8;
	g_max_loc_Y = height / 16;
	dispDeviceBase = (unsigned char *)address;
	dispDeviceRowBytes = pitch;
	dispDeviceDepth = depth == 15 ? 16 : depth;
	dispDeviceRect[0] = dispDeviceRect[1] = 0;
	dispDeviceRect[2] = width;
	dispDeviceRect[3] = height;

	return 0;
}

/* Calc the base address of a given point (x,y) */
static unsigned char * calc_base(int x, int y)
{
	unsigned char *base = dispDeviceBase;

	base += (x + dispDeviceRect[0]) * (dispDeviceDepth >> 3);
	base += (y + dispDeviceRect[1]) * dispDeviceRowBytes;
	return base;
}

static void btext_clearscreen(void)
{
	unsigned int *base	= (unsigned int *)calc_base(0, 0);
	unsigned long width 	= ((dispDeviceRect[2] - dispDeviceRect[0]) *
					(dispDeviceDepth >> 3)) >> 2;
	int i,j;

	for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1]); i++)
	{
		unsigned int *ptr = base;
		for(j=width; j; --j)
			*(ptr++) = 0;
		base += (dispDeviceRowBytes >> 2);
	}
}

#ifndef NO_SCROLL
static void scrollscreen(void)
{
	unsigned int *src     	= (unsigned int *)calc_base(0,16);
	unsigned int *dst     	= (unsigned int *)calc_base(0,0);
	unsigned long width    	= ((dispDeviceRect[2] - dispDeviceRect[0]) *
				   (dispDeviceDepth >> 3)) >> 2;
	int i,j;

	for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1] - 16); i++)
	{
		unsigned int *src_ptr = src;
		unsigned int *dst_ptr = dst;
		for(j=width; j; --j)
			*(dst_ptr++) = *(src_ptr++);
		src += (dispDeviceRowBytes >> 2);
		dst += (dispDeviceRowBytes >> 2);
	}
	for (i=0; i<16; i++)
	{
		unsigned int *dst_ptr = dst;
		for(j=width; j; --j)
			*(dst_ptr++) = 0;
		dst += (dispDeviceRowBytes >> 2);
	}
}
#endif /* ndef NO_SCROLL */

static void btext_drawchar(char c)
{
	int cline = 0;
#ifdef NO_SCROLL
	int x;
#endif
	switch (c) {
	case '\b':
		if (g_loc_X > 0)
			--g_loc_X;
		break;
	case '\t':
		g_loc_X = (g_loc_X & -8) + 8;
		break;
	case '\r':
		g_loc_X = 0;
		break;
	case '\n':
		g_loc_X = 0;
		g_loc_Y++;
		cline = 1;
		break;
	default:
		draw_byte(c, g_loc_X++, g_loc_Y);
	}
	if (g_loc_X >= g_max_loc_X) {
		g_loc_X = 0;
		g_loc_Y++;
		cline = 1;
	}
#ifndef NO_SCROLL
	while (g_loc_Y >= g_max_loc_Y) {
		scrollscreen();
		g_loc_Y--;
	}
#else
	/* wrap around from bottom to top of screen so we don't
	   waste time scrolling each line.  -- paulus. */
	if (g_loc_Y >= g_max_loc_Y)
		g_loc_Y = 0;
	if (cline) {
		for (x = 0; x < g_max_loc_X; ++x)
			draw_byte(' ', x, g_loc_Y);
	}
#endif
}

static void btext_drawtext(const char *c, unsigned int len)
{
	while (len--)
		btext_drawchar(*c++);
}

static void draw_byte(unsigned char c, long locX, long locY)
{
	unsigned char *base	= calc_base(locX << 3, locY << 4);
	unsigned int font_index = c * 16;
	const unsigned char *font	= font_sun_8x16.data + font_index;
	int rb			= dispDeviceRowBytes;

	switch(dispDeviceDepth) {
	case 24:
	case 32:
		draw_byte_32(font, (unsigned int *)base, rb);
		break;
	case 15:
	case 16:
		draw_byte_16(font, (unsigned int *)base, rb);
		break;
	case 8:
		draw_byte_8(font, (unsigned int *)base, rb);
		break;
	}
}

static unsigned int expand_bits_8[16] = {
	0x00000000,
	0x000000ff,
	0x0000ff00,
	0x0000ffff,
	0x00ff0000,
	0x00ff00ff,
	0x00ffff00,
	0x00ffffff,
	0xff000000,
	0xff0000ff,
	0xff00ff00,
	0xff00ffff,
	0xffff0000,
	0xffff00ff,
	0xffffff00,
	0xffffffff
};

static unsigned int expand_bits_16[4] = {
	0x00000000,
	0x0000ffff,
	0xffff0000,
	0xffffffff
};


static void draw_byte_32(const unsigned char *font, unsigned int *base, int rb)
{
	int l, bits;
	int fg = 0xFFFFFFFFUL;
	int bg = 0x00000000UL;

	for (l = 0; l < 16; ++l)
	{
		bits = *font++;
		base[0] = (-(bits >> 7) & fg) ^ bg;
		base[1] = (-((bits >> 6) & 1) & fg) ^ bg;
		base[2] = (-((bits >> 5) & 1) & fg) ^ bg;
		base[3] = (-((bits >> 4) & 1) & fg) ^ bg;
		base[4] = (-((bits >> 3) & 1) & fg) ^ bg;
		base[5] = (-((bits >> 2) & 1) & fg) ^ bg;
		base[6] = (-((bits >> 1) & 1) & fg) ^ bg;
		base[7] = (-(bits & 1) & fg) ^ bg;
		base = (unsigned int *) ((char *)base + rb);
	}
}

static void draw_byte_16(const unsigned char *font, unsigned int *base, int rb)
{
	int l, bits;
	int fg = 0xFFFFFFFFUL;
	int bg = 0x00000000UL;
	unsigned int *eb = (int *)expand_bits_16;

	for (l = 0; l < 16; ++l)
	{
		bits = *font++;
		base[0] = (eb[bits >> 6] & fg) ^ bg;
		base[1] = (eb[(bits >> 4) & 3] & fg) ^ bg;
		base[2] = (eb[(bits >> 2) & 3] & fg) ^ bg;
		base[3] = (eb[bits & 3] & fg) ^ bg;
		base = (unsigned int *) ((char *)base + rb);
	}
}

static void draw_byte_8(const unsigned char *font, unsigned int *base, int rb)
{
	int l, bits;
	int fg = 0x0F0F0F0FUL;
	int bg = 0x00000000UL;
	unsigned int *eb = (int *)expand_bits_8;

	for (l = 0; l < 16; ++l)
	{
		bits = *font++;
		base[0] = (eb[bits >> 4] & fg) ^ bg;
		base[1] = (eb[bits & 0xf] & fg) ^ bg;
		base = (unsigned int *) ((char *)base + rb);
	}
}

static void btext_console_write(struct console *con, const char *s,
				unsigned int n)
{
	btext_drawtext(s, n);
}

static struct console btext_console = {
	.name	= "btext",
	.write	= btext_console_write,
	.flags	= CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME,
	.index	= 0,
};

int __init btext_find_display(void)
{
	phandle node;
	char type[32];
	int ret;

	node = prom_inst2pkg(prom_stdout);
	if (prom_getproperty(node, "device_type", type, 32) < 0)
		return -ENODEV;
	if (strcmp(type, "display"))
		return -ENODEV;

	ret = btext_initialize(node);
	if (!ret) {
		btext_clearscreen();
		register_console(&btext_console);
	}
	return ret;
}