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fix a kmap leak in virtio_console
[linux/fpc-iii.git] / drivers / video / amba-clcd.c
blob14d6b3793e0a7a22e81ac3e6cbe1a60e5861d2d4
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/dma-mapping.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/string.h>
18 #include <linux/slab.h>
19 #include <linux/delay.h>
20 #include <linux/mm.h>
21 #include <linux/fb.h>
22 #include <linux/init.h>
23 #include <linux/ioport.h>
24 #include <linux/list.h>
25 #include <linux/amba/bus.h>
26 #include <linux/amba/clcd.h>
27 #include <linux/clk.h>
28 #include <linux/hardirq.h>
29
30 #include <asm/sizes.h>
31
32 #define to_clcd(info) container_of(info, struct clcd_fb, fb)
33
34 /* This is limited to 16 characters when displayed by X startup */
35 static const char *clcd_name = "CLCD FB";
36
37 /*
38 * Unfortunately, the enable/disable functions may be called either from
39 * process or IRQ context, and we _need_ to delay. This is _not_ good.
40 */
41 static inline void clcdfb_sleep(unsigned int ms)
42 {
43 if (in_atomic()) {
44 mdelay(ms);
45 } else {
46 msleep(ms);
47 }
48 }
49
50 static inline void clcdfb_set_start(struct clcd_fb *fb)
51 {
52 unsigned long ustart = fb->fb.fix.smem_start;
53 unsigned long lstart;
54
55 ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
56 lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;
57
58 writel(ustart, fb->regs + CLCD_UBAS);
59 writel(lstart, fb->regs + CLCD_LBAS);
60 }
61
62 static void clcdfb_disable(struct clcd_fb *fb)
63 {
64 u32 val;
65
66 if (fb->board->disable)
67 fb->board->disable(fb);
68
69 val = readl(fb->regs + fb->off_cntl);
70 if (val & CNTL_LCDPWR) {
71 val &= ~CNTL_LCDPWR;
72 writel(val, fb->regs + fb->off_cntl);
73
74 clcdfb_sleep(20);
75 }
76 if (val & CNTL_LCDEN) {
77 val &= ~CNTL_LCDEN;
78 writel(val, fb->regs + fb->off_cntl);
79 }
80
81 /*
82 * Disable CLCD clock source.
83 */
84 if (fb->clk_enabled) {
85 fb->clk_enabled = false;
86 clk_disable(fb->clk);
87 }
88 }
89
90 static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
91 {
92 /*
93 * Enable the CLCD clock source.
94 */
95 if (!fb->clk_enabled) {
96 fb->clk_enabled = true;
97 clk_enable(fb->clk);
98 }
99
100 /*
101 * Bring up by first enabling..
102 */
103 cntl |= CNTL_LCDEN;
104 writel(cntl, fb->regs + fb->off_cntl);
105
106 clcdfb_sleep(20);
107
108 /*
109 * and now apply power.
110 */
111 cntl |= CNTL_LCDPWR;
112 writel(cntl, fb->regs + fb->off_cntl);
113
114 /*
115 * finally, enable the interface.
116 */
117 if (fb->board->enable)
118 fb->board->enable(fb);
119 }
120
121 static int
122 clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
123 {
124 u32 caps;
125 int ret = 0;
126
127 if (fb->panel->caps && fb->board->caps)
128 caps = fb->panel->caps & fb->board->caps;
129 else {
130 /* Old way of specifying what can be used */
131 caps = fb->panel->cntl & CNTL_BGR ?
132 CLCD_CAP_BGR : CLCD_CAP_RGB;
133 /* But mask out 444 modes as they weren't supported */
134 caps &= ~CLCD_CAP_444;
135 }
136
137 /* Only TFT panels can do RGB888/BGR888 */
138 if (!(fb->panel->cntl & CNTL_LCDTFT))
139 caps &= ~CLCD_CAP_888;
140
141 memset(&var->transp, 0, sizeof(var->transp));
142
143 var->red.msb_right = 0;
144 var->green.msb_right = 0;
145 var->blue.msb_right = 0;
146
147 switch (var->bits_per_pixel) {
148 case 1:
149 case 2:
150 case 4:
151 case 8:
152 /* If we can't do 5551, reject */
153 caps &= CLCD_CAP_5551;
154 if (!caps) {
155 ret = -EINVAL;
156 break;
157 }
158
159 var->red.length = var->bits_per_pixel;
160 var->red.offset = 0;
161 var->green.length = var->bits_per_pixel;
162 var->green.offset = 0;
163 var->blue.length = var->bits_per_pixel;
164 var->blue.offset = 0;
165 break;
166
167 case 16:
168 /* If we can't do 444, 5551 or 565, reject */
169 if (!(caps & (CLCD_CAP_444 | CLCD_CAP_5551 | CLCD_CAP_565))) {
170 ret = -EINVAL;
171 break;
172 }
173
174 /*
175 * Green length can be 4, 5 or 6 depending whether
176 * we're operating in 444, 5551 or 565 mode.
177 */
178 if (var->green.length == 4 && caps & CLCD_CAP_444)
179 caps &= CLCD_CAP_444;
180 if (var->green.length == 5 && caps & CLCD_CAP_5551)
181 caps &= CLCD_CAP_5551;
182 else if (var->green.length == 6 && caps & CLCD_CAP_565)
183 caps &= CLCD_CAP_565;
184 else {
185 /*
186 * PL110 officially only supports RGB555,
187 * but may be wired up to allow RGB565.
188 */
189 if (caps & CLCD_CAP_565) {
190 var->green.length = 6;
191 caps &= CLCD_CAP_565;
192 } else if (caps & CLCD_CAP_5551) {
193 var->green.length = 5;
194 caps &= CLCD_CAP_5551;
195 } else {
196 var->green.length = 4;
197 caps &= CLCD_CAP_444;
198 }
199 }
200
201 if (var->green.length >= 5) {
202 var->red.length = 5;
203 var->blue.length = 5;
204 } else {
205 var->red.length = 4;
206 var->blue.length = 4;
207 }
208 break;
209 case 32:
210 /* If we can't do 888, reject */
211 caps &= CLCD_CAP_888;
212 if (!caps) {
213 ret = -EINVAL;
214 break;
215 }
216
217 var->red.length = 8;
218 var->green.length = 8;
219 var->blue.length = 8;
220 break;
221 default:
222 ret = -EINVAL;
223 break;
224 }
225
226 /*
227 * >= 16bpp displays have separate colour component bitfields
228 * encoded in the pixel data. Calculate their position from
229 * the bitfield length defined above.
230 */
231 if (ret == 0 && var->bits_per_pixel >= 16) {
232 bool bgr, rgb;
233
234 bgr = caps & CLCD_CAP_BGR && var->blue.offset == 0;
235 rgb = caps & CLCD_CAP_RGB && var->red.offset == 0;
236
237 if (!bgr && !rgb)
238 /*
239 * The requested format was not possible, try just
240 * our capabilities. One of BGR or RGB must be
241 * supported.
242 */
243 bgr = caps & CLCD_CAP_BGR;
244
245 if (bgr) {
246 var->blue.offset = 0;
247 var->green.offset = var->blue.offset + var->blue.length;
248 var->red.offset = var->green.offset + var->green.length;
249 } else {
250 var->red.offset = 0;
251 var->green.offset = var->red.offset + var->red.length;
252 var->blue.offset = var->green.offset + var->green.length;
253 }
254 }
255
256 return ret;
257 }
258
259 static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
260 {
261 struct clcd_fb *fb = to_clcd(info);
262 int ret = -EINVAL;
263
264 if (fb->board->check)
265 ret = fb->board->check(fb, var);
266
267 if (ret == 0 &&
268 var->xres_virtual * var->bits_per_pixel / 8 *
269 var->yres_virtual > fb->fb.fix.smem_len)
270 ret = -EINVAL;
271
272 if (ret == 0)
273 ret = clcdfb_set_bitfields(fb, var);
274
275 return ret;
276 }
277
278 static int clcdfb_set_par(struct fb_info *info)
279 {
280 struct clcd_fb *fb = to_clcd(info);
281 struct clcd_regs regs;
282
283 fb->fb.fix.line_length = fb->fb.var.xres_virtual *
284 fb->fb.var.bits_per_pixel / 8;
285
286 if (fb->fb.var.bits_per_pixel <= 8)
287 fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
288 else
289 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
290
291 fb->board->decode(fb, &regs);
292
293 clcdfb_disable(fb);
294
295 writel(regs.tim0, fb->regs + CLCD_TIM0);
296 writel(regs.tim1, fb->regs + CLCD_TIM1);
297 writel(regs.tim2, fb->regs + CLCD_TIM2);
298 writel(regs.tim3, fb->regs + CLCD_TIM3);
299
300 clcdfb_set_start(fb);
301
302 clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
303
304 fb->clcd_cntl = regs.cntl;
305
306 clcdfb_enable(fb, regs.cntl);
307
308 #ifdef DEBUG
309 printk(KERN_INFO
310 "CLCD: Registers set to\n"
311 " %08x %08x %08x %08x\n"
312 " %08x %08x %08x %08x\n",
313 readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
314 readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
315 readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
316 readl(fb->regs + fb->off_ienb), readl(fb->regs + fb->off_cntl));
317 #endif
318
319 return 0;
320 }
321
322 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
323 {
324 unsigned int mask = (1 << bf->length) - 1;
325
326 return (val >> (16 - bf->length) & mask) << bf->offset;
327 }
328
329 /*
330 * Set a single color register. The values supplied have a 16 bit
331 * magnitude. Return != 0 for invalid regno.
332 */
333 static int
334 clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
335 unsigned int blue, unsigned int transp, struct fb_info *info)
336 {
337 struct clcd_fb *fb = to_clcd(info);
338
339 if (regno < 16)
340 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
341 convert_bitfield(blue, &fb->fb.var.blue) |
342 convert_bitfield(green, &fb->fb.var.green) |
343 convert_bitfield(red, &fb->fb.var.red);
344
345 if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
346 int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
347 u32 val, mask, newval;
348
349 newval = (red >> 11) & 0x001f;
350 newval |= (green >> 6) & 0x03e0;
351 newval |= (blue >> 1) & 0x7c00;
352
353 /*
354 * 3.2.11: if we're configured for big endian
355 * byte order, the palette entries are swapped.
356 */
357 if (fb->clcd_cntl & CNTL_BEBO)
358 regno ^= 1;
359
360 if (regno & 1) {
361 newval <<= 16;
362 mask = 0x0000ffff;
363 } else {
364 mask = 0xffff0000;
365 }
366
367 val = readl(fb->regs + hw_reg) & mask;
368 writel(val | newval, fb->regs + hw_reg);
369 }
370
371 return regno > 255;
372 }
373
374 /*
375 * Blank the screen if blank_mode != 0, else unblank. If blank == NULL
376 * then the caller blanks by setting the CLUT (Color Look Up Table) to all
377 * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
378 * to e.g. a video mode which doesn't support it. Implements VESA suspend
379 * and powerdown modes on hardware that supports disabling hsync/vsync:
380 * blank_mode == 2: suspend vsync
381 * blank_mode == 3: suspend hsync
382 * blank_mode == 4: powerdown
383 */
384 static int clcdfb_blank(int blank_mode, struct fb_info *info)
385 {
386 struct clcd_fb *fb = to_clcd(info);
387
388 if (blank_mode != 0) {
389 clcdfb_disable(fb);
390 } else {
391 clcdfb_enable(fb, fb->clcd_cntl);
392 }
393 return 0;
394 }
395
396 static int clcdfb_mmap(struct fb_info *info,
397 struct vm_area_struct *vma)
398 {
399 struct clcd_fb *fb = to_clcd(info);
400 unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
401 int ret = -EINVAL;
402
403 len = info->fix.smem_len;
404
405 if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
406 fb->board->mmap)
407 ret = fb->board->mmap(fb, vma);
408
409 return ret;
410 }
411
412 static struct fb_ops clcdfb_ops = {
413 .owner = THIS_MODULE,
414 .fb_check_var = clcdfb_check_var,
415 .fb_set_par = clcdfb_set_par,
416 .fb_setcolreg = clcdfb_setcolreg,
417 .fb_blank = clcdfb_blank,
418 .fb_fillrect = cfb_fillrect,
419 .fb_copyarea = cfb_copyarea,
420 .fb_imageblit = cfb_imageblit,
421 .fb_mmap = clcdfb_mmap,
422 };
423
424 static int clcdfb_register(struct clcd_fb *fb)
425 {
426 int ret;
427
428 /*
429 * ARM PL111 always has IENB at 0x1c; it's only PL110
430 * which is reversed on some platforms.
431 */
432 if (amba_manf(fb->dev) == 0x41 && amba_part(fb->dev) == 0x111) {
433 fb->off_ienb = CLCD_PL111_IENB;
434 fb->off_cntl = CLCD_PL111_CNTL;
435 } else {
436 #ifdef CONFIG_ARCH_VERSATILE
437 fb->off_ienb = CLCD_PL111_IENB;
438 fb->off_cntl = CLCD_PL111_CNTL;
439 #else
440 fb->off_ienb = CLCD_PL110_IENB;
441 fb->off_cntl = CLCD_PL110_CNTL;
442 #endif
443 }
444
445 fb->clk = clk_get(&fb->dev->dev, NULL);
446 if (IS_ERR(fb->clk)) {
447 ret = PTR_ERR(fb->clk);
448 goto out;
449 }
450
451 ret = clk_prepare(fb->clk);
452 if (ret)
453 goto free_clk;
454
455 fb->fb.device = &fb->dev->dev;
456
457 fb->fb.fix.mmio_start = fb->dev->res.start;
458 fb->fb.fix.mmio_len = resource_size(&fb->dev->res);
459
460 fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
461 if (!fb->regs) {
462 printk(KERN_ERR "CLCD: unable to remap registers\n");
463 ret = -ENOMEM;
464 goto clk_unprep;
465 }
466
467 fb->fb.fbops = &clcdfb_ops;
468 fb->fb.flags = FBINFO_FLAG_DEFAULT;
469 fb->fb.pseudo_palette = fb->cmap;
470
471 strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
472 fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
473 fb->fb.fix.type_aux = 0;
474 fb->fb.fix.xpanstep = 0;
475 fb->fb.fix.ypanstep = 0;
476 fb->fb.fix.ywrapstep = 0;
477 fb->fb.fix.accel = FB_ACCEL_NONE;
478
479 fb->fb.var.xres = fb->panel->mode.xres;
480 fb->fb.var.yres = fb->panel->mode.yres;
481 fb->fb.var.xres_virtual = fb->panel->mode.xres;
482 fb->fb.var.yres_virtual = fb->panel->mode.yres;
483 fb->fb.var.bits_per_pixel = fb->panel->bpp;
484 fb->fb.var.grayscale = fb->panel->grayscale;
485 fb->fb.var.pixclock = fb->panel->mode.pixclock;
486 fb->fb.var.left_margin = fb->panel->mode.left_margin;
487 fb->fb.var.right_margin = fb->panel->mode.right_margin;
488 fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
489 fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
490 fb->fb.var.hsync_len = fb->panel->mode.hsync_len;
491 fb->fb.var.vsync_len = fb->panel->mode.vsync_len;
492 fb->fb.var.sync = fb->panel->mode.sync;
493 fb->fb.var.vmode = fb->panel->mode.vmode;
494 fb->fb.var.activate = FB_ACTIVATE_NOW;
495 fb->fb.var.nonstd = 0;
496 fb->fb.var.height = fb->panel->height;
497 fb->fb.var.width = fb->panel->width;
498 fb->fb.var.accel_flags = 0;
499
500 fb->fb.monspecs.hfmin = 0;
501 fb->fb.monspecs.hfmax = 100000;
502 fb->fb.monspecs.vfmin = 0;
503 fb->fb.monspecs.vfmax = 400;
504 fb->fb.monspecs.dclkmin = 1000000;
505 fb->fb.monspecs.dclkmax = 100000000;
506
507 /*
508 * Make sure that the bitfields are set appropriately.
509 */
510 clcdfb_set_bitfields(fb, &fb->fb.var);
511
512 /*
513 * Allocate colourmap.
514 */
515 ret = fb_alloc_cmap(&fb->fb.cmap, 256, 0);
516 if (ret)
517 goto unmap;
518
519 /*
520 * Ensure interrupts are disabled.
521 */
522 writel(0, fb->regs + fb->off_ienb);
523
524 fb_set_var(&fb->fb, &fb->fb.var);
525
526 dev_info(&fb->dev->dev, "%s hardware, %s display\n",
527 fb->board->name, fb->panel->mode.name);
528
529 ret = register_framebuffer(&fb->fb);
530 if (ret == 0)
531 goto out;
532
533 printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
534
535 fb_dealloc_cmap(&fb->fb.cmap);
536 unmap:
537 iounmap(fb->regs);
538 clk_unprep:
539 clk_unprepare(fb->clk);
540 free_clk:
541 clk_put(fb->clk);
542 out:
543 return ret;
544 }
545
546 static int clcdfb_probe(struct amba_device *dev, const struct amba_id *id)
547 {
548 struct clcd_board *board = dev_get_platdata(&dev->dev);
549 struct clcd_fb *fb;
550 int ret;
551
552 if (!board)
553 return -EINVAL;
554
555 ret = dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
556 if (ret)
557 goto out;
558
559 ret = amba_request_regions(dev, NULL);
560 if (ret) {
561 printk(KERN_ERR "CLCD: unable to reserve regs region\n");
562 goto out;
563 }
564
565 fb = kzalloc(sizeof(struct clcd_fb), GFP_KERNEL);
566 if (!fb) {
567 printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
568 ret = -ENOMEM;
569 goto free_region;
570 }
571
572 fb->dev = dev;
573 fb->board = board;
574
575 dev_info(&fb->dev->dev, "PL%03x rev%u at 0x%08llx\n",
576 amba_part(dev), amba_rev(dev),
577 (unsigned long long)dev->res.start);
578
579 ret = fb->board->setup(fb);
580 if (ret)
581 goto free_fb;
582
583 ret = clcdfb_register(fb);
584 if (ret == 0) {
585 amba_set_drvdata(dev, fb);
586 goto out;
587 }
588
589 fb->board->remove(fb);
590 free_fb:
591 kfree(fb);
592 free_region:
593 amba_release_regions(dev);
594 out:
595 return ret;
596 }
597
598 static int clcdfb_remove(struct amba_device *dev)
599 {
600 struct clcd_fb *fb = amba_get_drvdata(dev);
601
602 clcdfb_disable(fb);
603 unregister_framebuffer(&fb->fb);
604 if (fb->fb.cmap.len)
605 fb_dealloc_cmap(&fb->fb.cmap);
606 iounmap(fb->regs);
607 clk_unprepare(fb->clk);
608 clk_put(fb->clk);
609
610 fb->board->remove(fb);
611
612 kfree(fb);
613
614 amba_release_regions(dev);
615
616 return 0;
617 }
618
619 static struct amba_id clcdfb_id_table[] = {
620 {
621 .id = 0x00041110,
622 .mask = 0x000ffffe,
623 },
624 { 0, 0 },
625 };
626
627 MODULE_DEVICE_TABLE(amba, clcdfb_id_table);
628
629 static struct amba_driver clcd_driver = {
630 .drv = {
631 .name = "clcd-pl11x",
632 },
633 .probe = clcdfb_probe,
634 .remove = clcdfb_remove,
635 .id_table = clcdfb_id_table,
636 };
637
638 static int __init amba_clcdfb_init(void)
639 {
640 if (fb_get_options("ambafb", NULL))
641 return -ENODEV;
642
643 return amba_driver_register(&clcd_driver);
644 }
645
646 module_init(amba_clcdfb_init);
647
648 static void __exit amba_clcdfb_exit(void)
649 {
650 amba_driver_unregister(&clcd_driver);
651 }
652
653 module_exit(amba_clcdfb_exit);
654
655 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
656 MODULE_LICENSE("GPL");
Linux with added FPC-III support