?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[PATCH] mv643xx: add workaround for HW checksum generation bug
[linux-2.6/sactl.git] / drivers / video / amba-clcd.c
blob321dbe91dc14e270450216cf4cc79562d89ca225
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
25 #include <asm/hardware/amba.h>
26 #include <asm/hardware/clock.h>
27
28 #include <asm/hardware/amba_clcd.h>
29
30 #define to_clcd(info) container_of(info, struct clcd_fb, fb)
31
32 /* This is limited to 16 characters when displayed by X startup */
33 static const char *clcd_name = "CLCD FB";
34
35 /*
36 * Unfortunately, the enable/disable functions may be called either from
37 * process or IRQ context, and we _need_ to delay. This is _not_ good.
38 */
39 static inline void clcdfb_sleep(unsigned int ms)
40 {
41 if (in_atomic()) {
42 mdelay(ms);
43 } else {
44 msleep(ms);
45 }
46 }
47
48 static inline void clcdfb_set_start(struct clcd_fb *fb)
49 {
50 unsigned long ustart = fb->fb.fix.smem_start;
51 unsigned long lstart;
52
53 ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
54 lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;
55
56 writel(ustart, fb->regs + CLCD_UBAS);
57 writel(lstart, fb->regs + CLCD_LBAS);
58 }
59
60 static void clcdfb_disable(struct clcd_fb *fb)
61 {
62 u32 val;
63
64 if (fb->board->disable)
65 fb->board->disable(fb);
66
67 val = readl(fb->regs + CLCD_CNTL);
68 if (val & CNTL_LCDPWR) {
69 val &= ~CNTL_LCDPWR;
70 writel(val, fb->regs + CLCD_CNTL);
71
72 clcdfb_sleep(20);
73 }
74 if (val & CNTL_LCDEN) {
75 val &= ~CNTL_LCDEN;
76 writel(val, fb->regs + CLCD_CNTL);
77 }
78
79 /*
80 * Disable CLCD clock source.
81 */
82 clk_disable(fb->clk);
83 }
84
85 static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
86 {
87 /*
88 * Enable the CLCD clock source.
89 */
90 clk_enable(fb->clk);
91
92 /*
93 * Bring up by first enabling..
94 */
95 cntl |= CNTL_LCDEN;
96 writel(cntl, fb->regs + CLCD_CNTL);
97
98 clcdfb_sleep(20);
99
100 /*
101 * and now apply power.
102 */
103 cntl |= CNTL_LCDPWR;
104 writel(cntl, fb->regs + CLCD_CNTL);
105
106 /*
107 * finally, enable the interface.
108 */
109 if (fb->board->enable)
110 fb->board->enable(fb);
111 }
112
113 static int
114 clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
115 {
116 int ret = 0;
117
118 memset(&var->transp, 0, sizeof(var->transp));
119 memset(&var->red, 0, sizeof(var->red));
120 memset(&var->green, 0, sizeof(var->green));
121 memset(&var->blue, 0, sizeof(var->blue));
122
123 switch (var->bits_per_pixel) {
124 case 1:
125 case 2:
126 case 4:
127 case 8:
128 var->red.length = var->bits_per_pixel;
129 var->red.offset = 0;
130 var->green.length = var->bits_per_pixel;
131 var->green.offset = 0;
132 var->blue.length = var->bits_per_pixel;
133 var->blue.offset = 0;
134 break;
135 case 16:
136 var->red.length = 5;
137 var->green.length = 6;
138 var->blue.length = 5;
139 if (fb->panel->cntl & CNTL_BGR) {
140 var->red.offset = 11;
141 var->green.offset = 5;
142 var->blue.offset = 0;
143 } else {
144 var->red.offset = 0;
145 var->green.offset = 5;
146 var->blue.offset = 11;
147 }
148 break;
149 case 32:
150 if (fb->panel->cntl & CNTL_LCDTFT) {
151 var->red.length = 8;
152 var->green.length = 8;
153 var->blue.length = 8;
154
155 if (fb->panel->cntl & CNTL_BGR) {
156 var->red.offset = 16;
157 var->green.offset = 8;
158 var->blue.offset = 0;
159 } else {
160 var->red.offset = 0;
161 var->green.offset = 8;
162 var->blue.offset = 16;
163 }
164 break;
165 }
166 default:
167 ret = -EINVAL;
168 break;
169 }
170
171 return ret;
172 }
173
174 static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
175 {
176 struct clcd_fb *fb = to_clcd(info);
177 int ret = -EINVAL;
178
179 if (fb->board->check)
180 ret = fb->board->check(fb, var);
181
182 if (ret == 0 &&
183 var->xres_virtual * var->bits_per_pixel / 8 *
184 var->yres_virtual > fb->fb.fix.smem_len)
185 ret = -EINVAL;
186
187 if (ret == 0)
188 ret = clcdfb_set_bitfields(fb, var);
189
190 return ret;
191 }
192
193 static int clcdfb_set_par(struct fb_info *info)
194 {
195 struct clcd_fb *fb = to_clcd(info);
196 struct clcd_regs regs;
197
198 fb->fb.fix.line_length = fb->fb.var.xres_virtual *
199 fb->fb.var.bits_per_pixel / 8;
200
201 if (fb->fb.var.bits_per_pixel <= 8)
202 fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
203 else
204 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
205
206 fb->board->decode(fb, &regs);
207
208 clcdfb_disable(fb);
209
210 writel(regs.tim0, fb->regs + CLCD_TIM0);
211 writel(regs.tim1, fb->regs + CLCD_TIM1);
212 writel(regs.tim2, fb->regs + CLCD_TIM2);
213 writel(regs.tim3, fb->regs + CLCD_TIM3);
214
215 clcdfb_set_start(fb);
216
217 clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
218
219 fb->clcd_cntl = regs.cntl;
220
221 clcdfb_enable(fb, regs.cntl);
222
223 #ifdef DEBUG
224 printk(KERN_INFO "CLCD: Registers set to\n"
225 KERN_INFO " %08x %08x %08x %08x\n"
226 KERN_INFO " %08x %08x %08x %08x\n",
227 readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
228 readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
229 readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
230 readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL));
231 #endif
232
233 return 0;
234 }
235
236 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
237 {
238 unsigned int mask = (1 << bf->length) - 1;
239
240 return (val >> (16 - bf->length) & mask) << bf->offset;
241 }
242
243 /*
244 * Set a single color register. The values supplied have a 16 bit
245 * magnitude. Return != 0 for invalid regno.
246 */
247 static int
248 clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
249 unsigned int blue, unsigned int transp, struct fb_info *info)
250 {
251 struct clcd_fb *fb = to_clcd(info);
252
253 if (regno < 16)
254 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
255 convert_bitfield(blue, &fb->fb.var.blue) |
256 convert_bitfield(green, &fb->fb.var.green) |
257 convert_bitfield(red, &fb->fb.var.red);
258
259 if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
260 int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
261 u32 val, mask, newval;
262
263 newval = (red >> 11) & 0x001f;
264 newval |= (green >> 6) & 0x03e0;
265 newval |= (blue >> 1) & 0x7c00;
266
267 /*
268 * 3.2.11: if we're configured for big endian
269 * byte order, the palette entries are swapped.
270 */
271 if (fb->clcd_cntl & CNTL_BEBO)
272 regno ^= 1;
273
274 if (regno & 1) {
275 newval <<= 16;
276 mask = 0x0000ffff;
277 } else {
278 mask = 0xffff0000;
279 }
280
281 val = readl(fb->regs + hw_reg) & mask;
282 writel(val | newval, fb->regs + hw_reg);
283 }
284
285 return regno > 255;
286 }
287
288 /*
289 * Blank the screen if blank_mode != 0, else unblank. If blank == NULL
290 * then the caller blanks by setting the CLUT (Color Look Up Table) to all
291 * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
292 * to e.g. a video mode which doesn't support it. Implements VESA suspend
293 * and powerdown modes on hardware that supports disabling hsync/vsync:
294 * blank_mode == 2: suspend vsync
295 * blank_mode == 3: suspend hsync
296 * blank_mode == 4: powerdown
297 */
298 static int clcdfb_blank(int blank_mode, struct fb_info *info)
299 {
300 struct clcd_fb *fb = to_clcd(info);
301
302 if (blank_mode != 0) {
303 clcdfb_disable(fb);
304 } else {
305 clcdfb_enable(fb, fb->clcd_cntl);
306 }
307 return 0;
308 }
309
310 static int clcdfb_mmap(struct fb_info *info, struct file *file,
311 struct vm_area_struct *vma)
312 {
313 struct clcd_fb *fb = to_clcd(info);
314 unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
315 int ret = -EINVAL;
316
317 len = info->fix.smem_len;
318
319 if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
320 fb->board->mmap)
321 ret = fb->board->mmap(fb, vma);
322
323 return ret;
324 }
325
326 static struct fb_ops clcdfb_ops = {
327 .owner = THIS_MODULE,
328 .fb_check_var = clcdfb_check_var,
329 .fb_set_par = clcdfb_set_par,
330 .fb_setcolreg = clcdfb_setcolreg,
331 .fb_blank = clcdfb_blank,
332 .fb_fillrect = cfb_fillrect,
333 .fb_copyarea = cfb_copyarea,
334 .fb_imageblit = cfb_imageblit,
335 .fb_cursor = soft_cursor,
336 .fb_mmap = clcdfb_mmap,
337 };
338
339 static int clcdfb_register(struct clcd_fb *fb)
340 {
341 int ret;
342
343 fb->clk = clk_get(&fb->dev->dev, "CLCDCLK");
344 if (IS_ERR(fb->clk)) {
345 ret = PTR_ERR(fb->clk);
346 goto out;
347 }
348
349 ret = clk_use(fb->clk);
350 if (ret)
351 goto free_clk;
352
353 fb->fb.fix.mmio_start = fb->dev->res.start;
354 fb->fb.fix.mmio_len = SZ_4K;
355
356 fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
357 if (!fb->regs) {
358 printk(KERN_ERR "CLCD: unable to remap registers\n");
359 ret = -ENOMEM;
360 goto unuse_clk;
361 }
362
363 fb->fb.fbops = &clcdfb_ops;
364 fb->fb.flags = FBINFO_FLAG_DEFAULT;
365 fb->fb.pseudo_palette = fb->cmap;
366
367 strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
368 fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
369 fb->fb.fix.type_aux = 0;
370 fb->fb.fix.xpanstep = 0;
371 fb->fb.fix.ypanstep = 0;
372 fb->fb.fix.ywrapstep = 0;
373 fb->fb.fix.accel = FB_ACCEL_NONE;
374
375 fb->fb.var.xres = fb->panel->mode.xres;
376 fb->fb.var.yres = fb->panel->mode.yres;
377 fb->fb.var.xres_virtual = fb->panel->mode.xres;
378 fb->fb.var.yres_virtual = fb->panel->mode.yres;
379 fb->fb.var.bits_per_pixel = fb->panel->bpp;
380 fb->fb.var.grayscale = fb->panel->grayscale;
381 fb->fb.var.pixclock = fb->panel->mode.pixclock;
382 fb->fb.var.left_margin = fb->panel->mode.left_margin;
383 fb->fb.var.right_margin = fb->panel->mode.right_margin;
384 fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
385 fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
386 fb->fb.var.hsync_len = fb->panel->mode.hsync_len;
387 fb->fb.var.vsync_len = fb->panel->mode.vsync_len;
388 fb->fb.var.sync = fb->panel->mode.sync;
389 fb->fb.var.vmode = fb->panel->mode.vmode;
390 fb->fb.var.activate = FB_ACTIVATE_NOW;
391 fb->fb.var.nonstd = 0;
392 fb->fb.var.height = fb->panel->height;
393 fb->fb.var.width = fb->panel->width;
394 fb->fb.var.accel_flags = 0;
395
396 fb->fb.monspecs.hfmin = 0;
397 fb->fb.monspecs.hfmax = 100000;
398 fb->fb.monspecs.vfmin = 0;
399 fb->fb.monspecs.vfmax = 400;
400 fb->fb.monspecs.dclkmin = 1000000;
401 fb->fb.monspecs.dclkmax = 100000000;
402
403 /*
404 * Make sure that the bitfields are set appropriately.
405 */
406 clcdfb_set_bitfields(fb, &fb->fb.var);
407
408 /*
409 * Allocate colourmap.
410 */
411 fb_alloc_cmap(&fb->fb.cmap, 256, 0);
412
413 /*
414 * Ensure interrupts are disabled.
415 */
416 writel(0, fb->regs + CLCD_IENB);
417
418 fb_set_var(&fb->fb, &fb->fb.var);
419
420 printk(KERN_INFO "CLCD: %s hardware, %s display\n",
421 fb->board->name, fb->panel->mode.name);
422
423 ret = register_framebuffer(&fb->fb);
424 if (ret == 0)
425 goto out;
426
427 printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
428
429 iounmap(fb->regs);
430 unuse_clk:
431 clk_unuse(fb->clk);
432 free_clk:
433 clk_put(fb->clk);
434 out:
435 return ret;
436 }
437
438 static int clcdfb_probe(struct amba_device *dev, void *id)
439 {
440 struct clcd_board *board = dev->dev.platform_data;
441 struct clcd_fb *fb;
442 int ret;
443
444 if (!board)
445 return -EINVAL;
446
447 ret = amba_request_regions(dev, NULL);
448 if (ret) {
449 printk(KERN_ERR "CLCD: unable to reserve regs region\n");
450 goto out;
451 }
452
453 fb = (struct clcd_fb *) kmalloc(sizeof(struct clcd_fb), GFP_KERNEL);
454 if (!fb) {
455 printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
456 ret = -ENOMEM;
457 goto free_region;
458 }
459 memset(fb, 0, sizeof(struct clcd_fb));
460
461 fb->dev = dev;
462 fb->board = board;
463
464 ret = fb->board->setup(fb);
465 if (ret)
466 goto free_fb;
467
468 ret = clcdfb_register(fb);
469 if (ret == 0) {
470 amba_set_drvdata(dev, fb);
471 goto out;
472 }
473
474 fb->board->remove(fb);
475 free_fb:
476 kfree(fb);
477 free_region:
478 amba_release_regions(dev);
479 out:
480 return ret;
481 }
482
483 static int clcdfb_remove(struct amba_device *dev)
484 {
485 struct clcd_fb *fb = amba_get_drvdata(dev);
486
487 amba_set_drvdata(dev, NULL);
488
489 clcdfb_disable(fb);
490 unregister_framebuffer(&fb->fb);
491 iounmap(fb->regs);
492 clk_unuse(fb->clk);
493 clk_put(fb->clk);
494
495 fb->board->remove(fb);
496
497 kfree(fb);
498
499 amba_release_regions(dev);
500
501 return 0;
502 }
503
504 static struct amba_id clcdfb_id_table[] = {
505 {
506 .id = 0x00041110,
507 .mask = 0x000fffff,
508 },
509 { 0, 0 },
510 };
511
512 static struct amba_driver clcd_driver = {
513 .drv = {
514 .name = "clcd-pl110",
515 },
516 .probe = clcdfb_probe,
517 .remove = clcdfb_remove,
518 .id_table = clcdfb_id_table,
519 };
520
521 int __init amba_clcdfb_init(void)
522 {
523 if (fb_get_options("ambafb", NULL))
524 return -ENODEV;
525
526 return amba_driver_register(&clcd_driver);
527 }
528
529 module_init(amba_clcdfb_init);
530
531 static void __exit amba_clcdfb_exit(void)
532 {
533 amba_driver_unregister(&clcd_driver);
534 }
535
536 module_exit(amba_clcdfb_exit);
537
538 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
539 MODULE_LICENSE("GPL");
SocketAccessConTroL development