aboutsummaryrefslogtreecommitdiff
path: root/drivers/video/clps711xfb.c
blob: 3701caa367e4746f9b4c345fc6669f9b8acaa613 (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
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
/*
 *  linux/drivers/video/clps711xfb.c
 *
 *  Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Framebuffer driver for the CLPS7111 and EP7212 processors.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>

#include <asm/arch/hardware.h>
#include <asm/mach-types.h>
#include <linux/uaccess.h>

#include <asm/hardware/clps7111.h>
#include <asm/arch/syspld.h>

struct fb_info	*cfb;

#define CMAP_MAX_SIZE	16

/* The /proc entry for the backlight. */
static struct proc_dir_entry *clps7111fb_backlight_proc_entry = NULL;

static int clps7111fb_proc_backlight_read(char *page, char **start, off_t off,
		int count, int *eof, void *data);
static int clps7111fb_proc_backlight_write(struct file *file, 
		const char *buffer, unsigned long count, void *data);

/*
 * LCD AC Prescale.  This comes from the LCD panel manufacturers specifications.
 * This determines how many clocks + 1 of CL1 before the M signal toggles.
 * The number of lines on the display must not be divisible by this number.
 */
static unsigned int lcd_ac_prescale = 13;

/*
 *    Set a single color register. Return != 0 for invalid regno.
 */
static int
clps7111fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
		     u_int transp, struct fb_info *info)
{
	unsigned int level, mask, shift, pal;

	if (regno >= (1 << info->var.bits_per_pixel))
		return 1;

	/* gray = 0.30*R + 0.58*G + 0.11*B */
	level = (red * 77 + green * 151 + blue * 28) >> 20;

	/*
	 * On an LCD, a high value is dark, while a low value is light. 
	 * So we invert the level.
	 *
	 * This isn't true on all machines, so we only do it on EDB7211.
	 *  --rmk
	 */
	if (machine_is_edb7211()) {
		level = 15 - level;
	}

	shift = 4 * (regno & 7);
	level <<= shift;
	mask  = 15 << shift;
	level &= mask;

	regno = regno < 8 ? PALLSW : PALMSW;

	pal = clps_readl(regno);
	pal = (pal & ~mask) | level;
	clps_writel(pal, regno);

	return 0;
}

/*
 * Validate the purposed mode.
 */	
static int
clps7111fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	var->transp.msb_right	= 0;
	var->transp.offset	= 0;
	var->transp.length	= 0;
	var->red.msb_right	= 0;
	var->red.offset		= 0;
	var->red.length		= var->bits_per_pixel;
	var->green		= var->red;
	var->blue		= var->red;

	if (var->bits_per_pixel > 4) 
		return -EINVAL;

	return 0;
}

/*
 * Set the hardware state.
 */ 
static int 
clps7111fb_set_par(struct fb_info *info)
{
	unsigned int lcdcon, syscon, pixclock;

	switch (info->var.bits_per_pixel) {
	case 1:
		info->fix.visual = FB_VISUAL_MONO01;
		break;
	case 2:
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	case 4:
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	}

	info->fix.line_length = info->var.xres_virtual * info->var.bits_per_pixel / 8;

	lcdcon = (info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel) / 128 - 1;
	lcdcon |= ((info->var.xres_virtual / 16) - 1) << 13;
	lcdcon |= lcd_ac_prescale << 25;

	/*
	 * Calculate pixel prescale value from the pixclock.  This is:
	 *  36.864MHz / pixclock_mhz - 1.
	 * However, pixclock is in picoseconds, so this ends up being:
	 *  36864000 * pixclock_ps / 10^12 - 1
	 * and this will overflow the 32-bit math.  We perform this as
	 * (9 * 4096000 == 36864000):
	 *  pixclock_ps * 9 * (4096000 / 10^12) - 1
	 */
	pixclock = 9 * info->var.pixclock / 244140 - 1;
	lcdcon |= pixclock << 19;

	if (info->var.bits_per_pixel == 4)
		lcdcon |= LCDCON_GSMD;
	if (info->var.bits_per_pixel >= 2)
		lcdcon |= LCDCON_GSEN;

	/*
	 * LCDCON must only be changed while the LCD is disabled
	 */
	syscon = clps_readl(SYSCON1);
	clps_writel(syscon & ~SYSCON1_LCDEN, SYSCON1);
	clps_writel(lcdcon, LCDCON);
	clps_writel(syscon | SYSCON1_LCDEN, SYSCON1);
	return 0;
}

static int clps7111fb_blank(int blank, struct fb_info *info)
{
    	if (blank) {
		if (machine_is_edb7211()) {
			/* Turn off the LCD backlight. */
			clps_writeb(clps_readb(PDDR) & ~EDB_PD3_LCDBL, PDDR);

			/* Power off the LCD DC-DC converter. */
			clps_writeb(clps_readb(PDDR) & ~EDB_PD1_LCD_DC_DC_EN, PDDR);

			/* Delay for a little while (half a second). */
			udelay(100);

			/* Power off the LCD panel. */
			clps_writeb(clps_readb(PDDR) & ~EDB_PD2_LCDEN, PDDR);

			/* Power off the LCD controller. */
			clps_writel(clps_readl(SYSCON1) & ~SYSCON1_LCDEN, 
					SYSCON1);
		}
	} else {
		if (machine_is_edb7211()) {
			/* Power up the LCD controller. */
			clps_writel(clps_readl(SYSCON1) | SYSCON1_LCDEN,
					SYSCON1);

			/* Power up the LCD panel. */
			clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR);

			/* Delay for a little while. */
			udelay(100);

			/* Power up the LCD DC-DC converter. */
			clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN,
					PDDR);

			/* Turn on the LCD backlight. */
			clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR);
		}
	}
	return 0;
}

static struct fb_ops clps7111fb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= clps7111fb_check_var,
	.fb_set_par	= clps7111fb_set_par,
	.fb_setcolreg	= clps7111fb_setcolreg,
	.fb_blank	= clps7111fb_blank,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

static int 
clps7111fb_proc_backlight_read(char *page, char **start, off_t off,
		int count, int *eof, void *data)
{
	/* We need at least two characters, one for the digit, and one for
	 * the terminating NULL. */
	if (count < 2) 
		return -EINVAL;

	if (machine_is_edb7211()) {
		return sprintf(page, "%d\n", 
				(clps_readb(PDDR) & EDB_PD3_LCDBL) ? 1 : 0);
	}

	return 0;
}

static int 
clps7111fb_proc_backlight_write(struct file *file, const char *buffer, 
		unsigned long count, void *data)
{
	unsigned char char_value;
	int value;

	if (count < 1) {
		return -EINVAL;
	}

	if (copy_from_user(&char_value, buffer, 1)) 
		return -EFAULT;

	value = char_value - '0';

	if (machine_is_edb7211()) {
		unsigned char port_d;

		port_d = clps_readb(PDDR);

		if (value) {
			port_d |= EDB_PD3_LCDBL;
		} else {
			port_d &= ~EDB_PD3_LCDBL;
		}

		clps_writeb(port_d, PDDR);
	}

	return count;
}

static void __init clps711x_guess_lcd_params(struct fb_info *info)
{
	unsigned int lcdcon, syscon, size;
	unsigned long phys_base = PAGE_OFFSET;
	void *virt_base = (void *)PAGE_OFFSET;

	info->var.xres_virtual	 = 640;
	info->var.yres_virtual	 = 240;
	info->var.bits_per_pixel = 4;
	info->var.activate	 = FB_ACTIVATE_NOW;
	info->var.height	 = -1;
	info->var.width		 = -1;
	info->var.pixclock	 = 93006; /* 10.752MHz pixel clock */

	/*
	 * If the LCD controller is already running, decode the values
	 * in LCDCON to xres/yres/bpp/pixclock/acprescale
	 */
	syscon = clps_readl(SYSCON1);
	if (syscon & SYSCON1_LCDEN) {
		lcdcon = clps_readl(LCDCON);

		/*
		 * Decode GSMD and GSEN bits to bits per pixel
		 */
		switch (lcdcon & (LCDCON_GSMD | LCDCON_GSEN)) {
		case LCDCON_GSMD | LCDCON_GSEN:
			info->var.bits_per_pixel = 4;
			break;

		case LCDCON_GSEN:
			info->var.bits_per_pixel = 2;
			break;

		default:
			info->var.bits_per_pixel = 1;
			break;
		}

		/*
		 * Decode xres/yres
		 */
		info->var.xres_virtual = (((lcdcon >> 13) & 0x3f) + 1) * 16;
		info->var.yres_virtual = (((lcdcon & 0x1fff) + 1) * 128) /
					  (info->var.xres_virtual *
					   info->var.bits_per_pixel);

		/*
		 * Calculate pixclock
		 */
		info->var.pixclock = (((lcdcon >> 19) & 0x3f) + 1) * 244140 / 9;

		/*
		 * Grab AC prescale
		 */
		lcd_ac_prescale = (lcdcon >> 25) & 0x1f;
	}

	info->var.xres = info->var.xres_virtual;
	info->var.yres = info->var.yres_virtual;
	info->var.grayscale = info->var.bits_per_pixel > 1;

	size = info->var.xres * info->var.yres * info->var.bits_per_pixel / 8;

	/*
	 * Might be worth checking to see if we can use the on-board
	 * RAM if size here...
	 * CLPS7110 - no on-board SRAM
	 * EP7212   - 38400 bytes
	 */
	if (size <= 38400) {
		printk(KERN_INFO "CLPS711xFB: could use on-board SRAM?\n");
	}

	if ((syscon & SYSCON1_LCDEN) == 0) {
		/*
		 * The display isn't running.  Ensure that
		 * the display memory is empty.
		 */
		memset(virt_base, 0, size);
	}

	info->screen_base    = virt_base;
	info->fix.smem_start = phys_base;
	info->fix.smem_len   = PAGE_ALIGN(size);
	info->fix.type       = FB_TYPE_PACKED_PIXELS;
}

int __init clps711xfb_init(void)
{
	int err = -ENOMEM;

	if (fb_get_options("clps711xfb", NULL))
		return -ENODEV;

	cfb = kzalloc(sizeof(*cfb), GFP_KERNEL);
	if (!cfb)
		goto out;

	strcpy(cfb->fix.id, "clps711x");

	cfb->fbops		= &clps7111fb_ops;
	cfb->flags		= FBINFO_DEFAULT;

	clps711x_guess_lcd_params(cfb);

	fb_alloc_cmap(&cfb->cmap, CMAP_MAX_SIZE, 0);

	/* Register the /proc entries. */
	clps7111fb_backlight_proc_entry = create_proc_entry("backlight", 0444,
		NULL);
	if (clps7111fb_backlight_proc_entry == NULL) {
		printk("Couldn't create the /proc entry for the backlight.\n");
		return -EINVAL;
	}

	clps7111fb_backlight_proc_entry->read_proc = 
		&clps7111fb_proc_backlight_read;
	clps7111fb_backlight_proc_entry->write_proc = 
		&clps7111fb_proc_backlight_write;

	/*
	 * Power up the LCD
	 */
	if (machine_is_p720t()) {
		PLD_LCDEN = PLD_LCDEN_EN;
		PLD_PWR |= (PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON);
	}

	if (machine_is_edb7211()) {
		/* Power up the LCD panel. */
		clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR);

		/* Delay for a little while. */
		udelay(100);

		/* Power up the LCD DC-DC converter. */
		clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, PDDR);

		/* Turn on the LCD backlight. */
		clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR);
	}

	err = register_framebuffer(cfb);

out:	return err;
}

static void __exit clps711xfb_exit(void)
{
	unregister_framebuffer(cfb);
	kfree(cfb);

	/*
	 * Power down the LCD
	 */
	if (machine_is_p720t()) {
		PLD_LCDEN = 0;
		PLD_PWR &= ~(PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON);
	}
}

module_init(clps711xfb_init);
module_exit(clps711xfb_exit);

MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("CLPS711x framebuffer driver");
MODULE_LICENSE("GPL");