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ext4: fix undefined behavior in ext4_fill_flex_info()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / amba-clcd.c
bloba21efcd10b78792bd75132d19e72cbd56b55e2bf
1 /*
2 * linux/drivers/video/amba-clcd.c
3 *
4 * Copyright (C) 2001 ARM Limited, by David A Rusling
5 * Updated to 2.5, Deep Blue Solutions Ltd.
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive
9 * for more details.
10 *
11 * ARM PrimeCell PL110 Color LCD Controller
12 */
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/string.h>
17 #include <linux/slab.h>
18 #include <linux/delay.h>
19 #include <linux/mm.h>
20 #include <linux/fb.h>
21 #include <linux/init.h>
22 #include <linux/ioport.h>
23 #include <linux/list.h>
24 #include <linux/amba/bus.h>
25 #include <linux/amba/clcd.h>
26 #include <linux/clk.h>
27 #include <linux/hardirq.h>
28
29 #include <asm/sizes.h>
30
31 #define to_clcd(info) container_of(info, struct clcd_fb, fb)
32
33 /* This is limited to 16 characters when displayed by X startup */
34 static const char *clcd_name = "CLCD FB";
35
36 /*
37 * Unfortunately, the enable/disable functions may be called either from
38 * process or IRQ context, and we _need_ to delay. This is _not_ good.
39 */
40 static inline void clcdfb_sleep(unsigned int ms)
41 {
42 if (in_atomic()) {
43 mdelay(ms);
44 } else {
45 msleep(ms);
46 }
47 }
48
49 static inline void clcdfb_set_start(struct clcd_fb *fb)
50 {
51 unsigned long ustart = fb->fb.fix.smem_start;
52 unsigned long lstart;
53
54 ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
55 lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;
56
57 writel(ustart, fb->regs + CLCD_UBAS);
58 writel(lstart, fb->regs + CLCD_LBAS);
59 }
60
61 static void clcdfb_disable(struct clcd_fb *fb)
62 {
63 u32 val;
64
65 if (fb->board->disable)
66 fb->board->disable(fb);
67
68 val = readl(fb->regs + CLCD_CNTL);
69 if (val & CNTL_LCDPWR) {
70 val &= ~CNTL_LCDPWR;
71 writel(val, fb->regs + CLCD_CNTL);
72
73 clcdfb_sleep(20);
74 }
75 if (val & CNTL_LCDEN) {
76 val &= ~CNTL_LCDEN;
77 writel(val, fb->regs + CLCD_CNTL);
78 }
79
80 /*
81 * Disable CLCD clock source.
82 */
83 clk_disable(fb->clk);
84 }
85
86 static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
87 {
88 /*
89 * Enable the CLCD clock source.
90 */
91 clk_enable(fb->clk);
92
93 /*
94 * Bring up by first enabling..
95 */
96 cntl |= CNTL_LCDEN;
97 writel(cntl, fb->regs + CLCD_CNTL);
98
99 clcdfb_sleep(20);
100
101 /*
102 * and now apply power.
103 */
104 cntl |= CNTL_LCDPWR;
105 writel(cntl, fb->regs + CLCD_CNTL);
106
107 /*
108 * finally, enable the interface.
109 */
110 if (fb->board->enable)
111 fb->board->enable(fb);
112 }
113
114 static int
115 clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
116 {
117 int ret = 0;
118
119 memset(&var->transp, 0, sizeof(var->transp));
120
121 var->red.msb_right = 0;
122 var->green.msb_right = 0;
123 var->blue.msb_right = 0;
124
125 switch (var->bits_per_pixel) {
126 case 1:
127 case 2:
128 case 4:
129 case 8:
130 var->red.length = var->bits_per_pixel;
131 var->red.offset = 0;
132 var->green.length = var->bits_per_pixel;
133 var->green.offset = 0;
134 var->blue.length = var->bits_per_pixel;
135 var->blue.offset = 0;
136 break;
137 case 16:
138 var->red.length = 5;
139 var->blue.length = 5;
140 /*
141 * Green length can be 5 or 6 depending whether
142 * we're operating in RGB555 or RGB565 mode.
143 */
144 if (var->green.length != 5 && var->green.length != 6)
145 var->green.length = 6;
146 break;
147 case 32:
148 if (fb->panel->cntl & CNTL_LCDTFT) {
149 var->red.length = 8;
150 var->green.length = 8;
151 var->blue.length = 8;
152 break;
153 }
154 default:
155 ret = -EINVAL;
156 break;
157 }
158
159 /*
160 * >= 16bpp displays have separate colour component bitfields
161 * encoded in the pixel data. Calculate their position from
162 * the bitfield length defined above.
163 */
164 if (ret == 0 && var->bits_per_pixel >= 16) {
165 if (fb->panel->cntl & CNTL_BGR) {
166 var->blue.offset = 0;
167 var->green.offset = var->blue.offset + var->blue.length;
168 var->red.offset = var->green.offset + var->green.length;
169 } else {
170 var->red.offset = 0;
171 var->green.offset = var->red.offset + var->red.length;
172 var->blue.offset = var->green.offset + var->green.length;
173 }
174 }
175
176 return ret;
177 }
178
179 static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
180 {
181 struct clcd_fb *fb = to_clcd(info);
182 int ret = -EINVAL;
183
184 if (fb->board->check)
185 ret = fb->board->check(fb, var);
186
187 if (ret == 0 &&
188 var->xres_virtual * var->bits_per_pixel / 8 *
189 var->yres_virtual > fb->fb.fix.smem_len)
190 ret = -EINVAL;
191
192 if (ret == 0)
193 ret = clcdfb_set_bitfields(fb, var);
194
195 return ret;
196 }
197
198 static int clcdfb_set_par(struct fb_info *info)
199 {
200 struct clcd_fb *fb = to_clcd(info);
201 struct clcd_regs regs;
202
203 fb->fb.fix.line_length = fb->fb.var.xres_virtual *
204 fb->fb.var.bits_per_pixel / 8;
205
206 if (fb->fb.var.bits_per_pixel <= 8)
207 fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
208 else
209 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
210
211 fb->board->decode(fb, &regs);
212
213 clcdfb_disable(fb);
214
215 writel(regs.tim0, fb->regs + CLCD_TIM0);
216 writel(regs.tim1, fb->regs + CLCD_TIM1);
217 writel(regs.tim2, fb->regs + CLCD_TIM2);
218 writel(regs.tim3, fb->regs + CLCD_TIM3);
219
220 clcdfb_set_start(fb);
221
222 clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
223
224 fb->clcd_cntl = regs.cntl;
225
226 clcdfb_enable(fb, regs.cntl);
227
228 #ifdef DEBUG
229 printk(KERN_INFO
230 "CLCD: Registers set to\n"
231 " %08x %08x %08x %08x\n"
232 " %08x %08x %08x %08x\n",
233 readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
234 readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
235 readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
236 readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL));
237 #endif
238
239 return 0;
240 }
241
242 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
243 {
244 unsigned int mask = (1 << bf->length) - 1;
245
246 return (val >> (16 - bf->length) & mask) << bf->offset;
247 }
248
249 /*
250 * Set a single color register. The values supplied have a 16 bit
251 * magnitude. Return != 0 for invalid regno.
252 */
253 static int
254 clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
255 unsigned int blue, unsigned int transp, struct fb_info *info)
256 {
257 struct clcd_fb *fb = to_clcd(info);
258
259 if (regno < 16)
260 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
261 convert_bitfield(blue, &fb->fb.var.blue) |
262 convert_bitfield(green, &fb->fb.var.green) |
263 convert_bitfield(red, &fb->fb.var.red);
264
265 if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
266 int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
267 u32 val, mask, newval;
268
269 newval = (red >> 11) & 0x001f;
270 newval |= (green >> 6) & 0x03e0;
271 newval |= (blue >> 1) & 0x7c00;
272
273 /*
274 * 3.2.11: if we're configured for big endian
275 * byte order, the palette entries are swapped.
276 */
277 if (fb->clcd_cntl & CNTL_BEBO)
278 regno ^= 1;
279
280 if (regno & 1) {
281 newval <<= 16;
282 mask = 0x0000ffff;
283 } else {
284 mask = 0xffff0000;
285 }
286
287 val = readl(fb->regs + hw_reg) & mask;
288 writel(val | newval, fb->regs + hw_reg);
289 }
290
291 return regno > 255;
292 }
293
294 /*
295 * Blank the screen if blank_mode != 0, else unblank. If blank == NULL
296 * then the caller blanks by setting the CLUT (Color Look Up Table) to all
297 * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
298 * to e.g. a video mode which doesn't support it. Implements VESA suspend
299 * and powerdown modes on hardware that supports disabling hsync/vsync:
300 * blank_mode == 2: suspend vsync
301 * blank_mode == 3: suspend hsync
302 * blank_mode == 4: powerdown
303 */
304 static int clcdfb_blank(int blank_mode, struct fb_info *info)
305 {
306 struct clcd_fb *fb = to_clcd(info);
307
308 if (blank_mode != 0) {
309 clcdfb_disable(fb);
310 } else {
311 clcdfb_enable(fb, fb->clcd_cntl);
312 }
313 return 0;
314 }
315
316 static int clcdfb_mmap(struct fb_info *info,
317 struct vm_area_struct *vma)
318 {
319 struct clcd_fb *fb = to_clcd(info);
320 unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
321 int ret = -EINVAL;
322
323 len = info->fix.smem_len;
324
325 if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
326 fb->board->mmap)
327 ret = fb->board->mmap(fb, vma);
328
329 return ret;
330 }
331
332 static struct fb_ops clcdfb_ops = {
333 .owner = THIS_MODULE,
334 .fb_check_var = clcdfb_check_var,
335 .fb_set_par = clcdfb_set_par,
336 .fb_setcolreg = clcdfb_setcolreg,
337 .fb_blank = clcdfb_blank,
338 .fb_fillrect = cfb_fillrect,
339 .fb_copyarea = cfb_copyarea,
340 .fb_imageblit = cfb_imageblit,
341 .fb_mmap = clcdfb_mmap,
342 };
343
344 static int clcdfb_register(struct clcd_fb *fb)
345 {
346 int ret;
347
348 fb->clk = clk_get(&fb->dev->dev, NULL);
349 if (IS_ERR(fb->clk)) {
350 ret = PTR_ERR(fb->clk);
351 goto out;
352 }
353
354 fb->fb.fix.mmio_start = fb->dev->res.start;
355 fb->fb.fix.mmio_len = resource_size(&fb->dev->res);
356
357 fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
358 if (!fb->regs) {
359 printk(KERN_ERR "CLCD: unable to remap registers\n");
360 ret = -ENOMEM;
361 goto free_clk;
362 }
363
364 fb->fb.fbops = &clcdfb_ops;
365 fb->fb.flags = FBINFO_FLAG_DEFAULT;
366 fb->fb.pseudo_palette = fb->cmap;
367
368 strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
369 fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
370 fb->fb.fix.type_aux = 0;
371 fb->fb.fix.xpanstep = 0;
372 fb->fb.fix.ypanstep = 0;
373 fb->fb.fix.ywrapstep = 0;
374 fb->fb.fix.accel = FB_ACCEL_NONE;
375
376 fb->fb.var.xres = fb->panel->mode.xres;
377 fb->fb.var.yres = fb->panel->mode.yres;
378 fb->fb.var.xres_virtual = fb->panel->mode.xres;
379 fb->fb.var.yres_virtual = fb->panel->mode.yres;
380 fb->fb.var.bits_per_pixel = fb->panel->bpp;
381 fb->fb.var.grayscale = fb->panel->grayscale;
382 fb->fb.var.pixclock = fb->panel->mode.pixclock;
383 fb->fb.var.left_margin = fb->panel->mode.left_margin;
384 fb->fb.var.right_margin = fb->panel->mode.right_margin;
385 fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
386 fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
387 fb->fb.var.hsync_len = fb->panel->mode.hsync_len;
388 fb->fb.var.vsync_len = fb->panel->mode.vsync_len;
389 fb->fb.var.sync = fb->panel->mode.sync;
390 fb->fb.var.vmode = fb->panel->mode.vmode;
391 fb->fb.var.activate = FB_ACTIVATE_NOW;
392 fb->fb.var.nonstd = 0;
393 fb->fb.var.height = fb->panel->height;
394 fb->fb.var.width = fb->panel->width;
395 fb->fb.var.accel_flags = 0;
396
397 fb->fb.monspecs.hfmin = 0;
398 fb->fb.monspecs.hfmax = 100000;
399 fb->fb.monspecs.vfmin = 0;
400 fb->fb.monspecs.vfmax = 400;
401 fb->fb.monspecs.dclkmin = 1000000;
402 fb->fb.monspecs.dclkmax = 100000000;
403
404 /*
405 * Make sure that the bitfields are set appropriately.
406 */
407 clcdfb_set_bitfields(fb, &fb->fb.var);
408
409 /*
410 * Allocate colourmap.
411 */
412 ret = fb_alloc_cmap(&fb->fb.cmap, 256, 0);
413 if (ret)
414 goto unmap;
415
416 /*
417 * Ensure interrupts are disabled.
418 */
419 writel(0, fb->regs + CLCD_IENB);
420
421 fb_set_var(&fb->fb, &fb->fb.var);
422
423 printk(KERN_INFO "CLCD: %s hardware, %s display\n",
424 fb->board->name, fb->panel->mode.name);
425
426 ret = register_framebuffer(&fb->fb);
427 if (ret == 0)
428 goto out;
429
430 printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
431
432 fb_dealloc_cmap(&fb->fb.cmap);
433 unmap:
434 iounmap(fb->regs);
435 free_clk:
436 clk_put(fb->clk);
437 out:
438 return ret;
439 }
440
441 static int clcdfb_probe(struct amba_device *dev, struct amba_id *id)
442 {
443 struct clcd_board *board = dev->dev.platform_data;
444 struct clcd_fb *fb;
445 int ret;
446
447 if (!board)
448 return -EINVAL;
449
450 ret = amba_request_regions(dev, NULL);
451 if (ret) {
452 printk(KERN_ERR "CLCD: unable to reserve regs region\n");
453 goto out;
454 }
455
456 fb = kzalloc(sizeof(struct clcd_fb), GFP_KERNEL);
457 if (!fb) {
458 printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
459 ret = -ENOMEM;
460 goto free_region;
461 }
462
463 fb->dev = dev;
464 fb->board = board;
465
466 ret = fb->board->setup(fb);
467 if (ret)
468 goto free_fb;
469
470 ret = clcdfb_register(fb);
471 if (ret == 0) {
472 amba_set_drvdata(dev, fb);
473 goto out;
474 }
475
476 fb->board->remove(fb);
477 free_fb:
478 kfree(fb);
479 free_region:
480 amba_release_regions(dev);
481 out:
482 return ret;
483 }
484
485 static int clcdfb_remove(struct amba_device *dev)
486 {
487 struct clcd_fb *fb = amba_get_drvdata(dev);
488
489 amba_set_drvdata(dev, NULL);
490
491 clcdfb_disable(fb);
492 unregister_framebuffer(&fb->fb);
493 if (fb->fb.cmap.len)
494 fb_dealloc_cmap(&fb->fb.cmap);
495 iounmap(fb->regs);
496 clk_put(fb->clk);
497
498 fb->board->remove(fb);
499
500 kfree(fb);
501
502 amba_release_regions(dev);
503
504 return 0;
505 }
506
507 static struct amba_id clcdfb_id_table[] = {
508 {
509 .id = 0x00041110,
510 .mask = 0x000ffffe,
511 },
512 { 0, 0 },
513 };
514
515 static struct amba_driver clcd_driver = {
516 .drv = {
517 .name = "clcd-pl11x",
518 },
519 .probe = clcdfb_probe,
520 .remove = clcdfb_remove,
521 .id_table = clcdfb_id_table,
522 };
523
524 static int __init amba_clcdfb_init(void)
525 {
526 if (fb_get_options("ambafb", NULL))
527 return -ENODEV;
528
529 return amba_driver_register(&clcd_driver);
530 }
531
532 module_init(amba_clcdfb_init);
533
534 static void __exit amba_clcdfb_exit(void)
535 {
536 amba_driver_unregister(&clcd_driver);
537 }
538
539 module_exit(amba_clcdfb_exit);
540
541 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
542 MODULE_LICENSE("GPL");
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