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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / video / amba-clcd.c
bloba7a1c891bfa2e0646a1e73757f47de70e017b77a
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
28 #include <asm/sizes.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
120 var->red.msb_right = 0;
121 var->green.msb_right = 0;
122 var->blue.msb_right = 0;
123
124 switch (var->bits_per_pixel) {
125 case 1:
126 case 2:
127 case 4:
128 case 8:
129 var->red.length = var->bits_per_pixel;
130 var->red.offset = 0;
131 var->green.length = var->bits_per_pixel;
132 var->green.offset = 0;
133 var->blue.length = var->bits_per_pixel;
134 var->blue.offset = 0;
135 break;
136 case 16:
137 var->red.length = 5;
138 var->blue.length = 5;
139 /*
140 * Green length can be 5 or 6 depending whether
141 * we're operating in RGB555 or RGB565 mode.
142 */
143 if (var->green.length != 5 && var->green.length != 6)
144 var->green.length = 6;
145 break;
146 case 32:
147 if (fb->panel->cntl & CNTL_LCDTFT) {
148 var->red.length = 8;
149 var->green.length = 8;
150 var->blue.length = 8;
151 break;
152 }
153 default:
154 ret = -EINVAL;
155 break;
156 }
157
158 /*
159 * >= 16bpp displays have separate colour component bitfields
160 * encoded in the pixel data. Calculate their position from
161 * the bitfield length defined above.
162 */
163 if (ret == 0 && var->bits_per_pixel >= 16) {
164 if (fb->panel->cntl & CNTL_BGR) {
165 var->blue.offset = 0;
166 var->green.offset = var->blue.offset + var->blue.length;
167 var->red.offset = var->green.offset + var->green.length;
168 } else {
169 var->red.offset = 0;
170 var->green.offset = var->red.offset + var->red.length;
171 var->blue.offset = var->green.offset + var->green.length;
172 }
173 }
174
175 return ret;
176 }
177
178 static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
179 {
180 struct clcd_fb *fb = to_clcd(info);
181 int ret = -EINVAL;
182
183 if (fb->board->check)
184 ret = fb->board->check(fb, var);
185
186 if (ret == 0 &&
187 var->xres_virtual * var->bits_per_pixel / 8 *
188 var->yres_virtual > fb->fb.fix.smem_len)
189 ret = -EINVAL;
190
191 if (ret == 0)
192 ret = clcdfb_set_bitfields(fb, var);
193
194 return ret;
195 }
196
197 static int clcdfb_set_par(struct fb_info *info)
198 {
199 struct clcd_fb *fb = to_clcd(info);
200 struct clcd_regs regs;
201
202 fb->fb.fix.line_length = fb->fb.var.xres_virtual *
203 fb->fb.var.bits_per_pixel / 8;
204
205 if (fb->fb.var.bits_per_pixel <= 8)
206 fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
207 else
208 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
209
210 fb->board->decode(fb, &regs);
211
212 clcdfb_disable(fb);
213
214 writel(regs.tim0, fb->regs + CLCD_TIM0);
215 writel(regs.tim1, fb->regs + CLCD_TIM1);
216 writel(regs.tim2, fb->regs + CLCD_TIM2);
217 writel(regs.tim3, fb->regs + CLCD_TIM3);
218
219 clcdfb_set_start(fb);
220
221 clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
222
223 fb->clcd_cntl = regs.cntl;
224
225 clcdfb_enable(fb, regs.cntl);
226
227 #ifdef DEBUG
228 printk(KERN_INFO "CLCD: Registers set to\n"
229 KERN_INFO " %08x %08x %08x %08x\n"
230 KERN_INFO " %08x %08x %08x %08x\n",
231 readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
232 readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
233 readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
234 readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL));
235 #endif
236
237 return 0;
238 }
239
240 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
241 {
242 unsigned int mask = (1 << bf->length) - 1;
243
244 return (val >> (16 - bf->length) & mask) << bf->offset;
245 }
246
247 /*
248 * Set a single color register. The values supplied have a 16 bit
249 * magnitude. Return != 0 for invalid regno.
250 */
251 static int
252 clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
253 unsigned int blue, unsigned int transp, struct fb_info *info)
254 {
255 struct clcd_fb *fb = to_clcd(info);
256
257 if (regno < 16)
258 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
259 convert_bitfield(blue, &fb->fb.var.blue) |
260 convert_bitfield(green, &fb->fb.var.green) |
261 convert_bitfield(red, &fb->fb.var.red);
262
263 if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
264 int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
265 u32 val, mask, newval;
266
267 newval = (red >> 11) & 0x001f;
268 newval |= (green >> 6) & 0x03e0;
269 newval |= (blue >> 1) & 0x7c00;
270
271 /*
272 * 3.2.11: if we're configured for big endian
273 * byte order, the palette entries are swapped.
274 */
275 if (fb->clcd_cntl & CNTL_BEBO)
276 regno ^= 1;
277
278 if (regno & 1) {
279 newval <<= 16;
280 mask = 0x0000ffff;
281 } else {
282 mask = 0xffff0000;
283 }
284
285 val = readl(fb->regs + hw_reg) & mask;
286 writel(val | newval, fb->regs + hw_reg);
287 }
288
289 return regno > 255;
290 }
291
292 /*
293 * Blank the screen if blank_mode != 0, else unblank. If blank == NULL
294 * then the caller blanks by setting the CLUT (Color Look Up Table) to all
295 * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
296 * to e.g. a video mode which doesn't support it. Implements VESA suspend
297 * and powerdown modes on hardware that supports disabling hsync/vsync:
298 * blank_mode == 2: suspend vsync
299 * blank_mode == 3: suspend hsync
300 * blank_mode == 4: powerdown
301 */
302 static int clcdfb_blank(int blank_mode, struct fb_info *info)
303 {
304 struct clcd_fb *fb = to_clcd(info);
305
306 if (blank_mode != 0) {
307 clcdfb_disable(fb);
308 } else {
309 clcdfb_enable(fb, fb->clcd_cntl);
310 }
311 return 0;
312 }
313
314 static int clcdfb_mmap(struct fb_info *info,
315 struct vm_area_struct *vma)
316 {
317 struct clcd_fb *fb = to_clcd(info);
318 unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
319 int ret = -EINVAL;
320
321 len = info->fix.smem_len;
322
323 if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
324 fb->board->mmap)
325 ret = fb->board->mmap(fb, vma);
326
327 return ret;
328 }
329
330 static struct fb_ops clcdfb_ops = {
331 .owner = THIS_MODULE,
332 .fb_check_var = clcdfb_check_var,
333 .fb_set_par = clcdfb_set_par,
334 .fb_setcolreg = clcdfb_setcolreg,
335 .fb_blank = clcdfb_blank,
336 .fb_fillrect = cfb_fillrect,
337 .fb_copyarea = cfb_copyarea,
338 .fb_imageblit = cfb_imageblit,
339 .fb_mmap = clcdfb_mmap,
340 };
341
342 static int clcdfb_register(struct clcd_fb *fb)
343 {
344 int ret;
345
346 fb->clk = clk_get(&fb->dev->dev, "CLCDCLK");
347 if (IS_ERR(fb->clk)) {
348 ret = PTR_ERR(fb->clk);
349 goto out;
350 }
351
352 fb->fb.fix.mmio_start = fb->dev->res.start;
353 fb->fb.fix.mmio_len = SZ_4K;
354
355 fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
356 if (!fb->regs) {
357 printk(KERN_ERR "CLCD: unable to remap registers\n");
358 ret = -ENOMEM;
359 goto free_clk;
360 }
361
362 fb->fb.fbops = &clcdfb_ops;
363 fb->fb.flags = FBINFO_FLAG_DEFAULT;
364 fb->fb.pseudo_palette = fb->cmap;
365
366 strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
367 fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
368 fb->fb.fix.type_aux = 0;
369 fb->fb.fix.xpanstep = 0;
370 fb->fb.fix.ypanstep = 0;
371 fb->fb.fix.ywrapstep = 0;
372 fb->fb.fix.accel = FB_ACCEL_NONE;
373
374 fb->fb.var.xres = fb->panel->mode.xres;
375 fb->fb.var.yres = fb->panel->mode.yres;
376 fb->fb.var.xres_virtual = fb->panel->mode.xres;
377 fb->fb.var.yres_virtual = fb->panel->mode.yres;
378 fb->fb.var.bits_per_pixel = fb->panel->bpp;
379 fb->fb.var.grayscale = fb->panel->grayscale;
380 fb->fb.var.pixclock = fb->panel->mode.pixclock;
381 fb->fb.var.left_margin = fb->panel->mode.left_margin;
382 fb->fb.var.right_margin = fb->panel->mode.right_margin;
383 fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
384 fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
385 fb->fb.var.hsync_len = fb->panel->mode.hsync_len;
386 fb->fb.var.vsync_len = fb->panel->mode.vsync_len;
387 fb->fb.var.sync = fb->panel->mode.sync;
388 fb->fb.var.vmode = fb->panel->mode.vmode;
389 fb->fb.var.activate = FB_ACTIVATE_NOW;
390 fb->fb.var.nonstd = 0;
391 fb->fb.var.height = fb->panel->height;
392 fb->fb.var.width = fb->panel->width;
393 fb->fb.var.accel_flags = 0;
394
395 fb->fb.monspecs.hfmin = 0;
396 fb->fb.monspecs.hfmax = 100000;
397 fb->fb.monspecs.vfmin = 0;
398 fb->fb.monspecs.vfmax = 400;
399 fb->fb.monspecs.dclkmin = 1000000;
400 fb->fb.monspecs.dclkmax = 100000000;
401
402 /*
403 * Make sure that the bitfields are set appropriately.
404 */
405 clcdfb_set_bitfields(fb, &fb->fb.var);
406
407 /*
408 * Allocate colourmap.
409 */
410 fb_alloc_cmap(&fb->fb.cmap, 256, 0);
411
412 /*
413 * Ensure interrupts are disabled.
414 */
415 writel(0, fb->regs + CLCD_IENB);
416
417 fb_set_var(&fb->fb, &fb->fb.var);
418
419 printk(KERN_INFO "CLCD: %s hardware, %s display\n",
420 fb->board->name, fb->panel->mode.name);
421
422 ret = register_framebuffer(&fb->fb);
423 if (ret == 0)
424 goto out;
425
426 printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
427
428 iounmap(fb->regs);
429 free_clk:
430 clk_put(fb->clk);
431 out:
432 return ret;
433 }
434
435 static int clcdfb_probe(struct amba_device *dev, void *id)
436 {
437 struct clcd_board *board = dev->dev.platform_data;
438 struct clcd_fb *fb;
439 int ret;
440
441 if (!board)
442 return -EINVAL;
443
444 ret = amba_request_regions(dev, NULL);
445 if (ret) {
446 printk(KERN_ERR "CLCD: unable to reserve regs region\n");
447 goto out;
448 }
449
450 fb = kzalloc(sizeof(struct clcd_fb), GFP_KERNEL);
451 if (!fb) {
452 printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
453 ret = -ENOMEM;
454 goto free_region;
455 }
456
457 fb->dev = dev;
458 fb->board = board;
459
460 ret = fb->board->setup(fb);
461 if (ret)
462 goto free_fb;
463
464 ret = clcdfb_register(fb);
465 if (ret == 0) {
466 amba_set_drvdata(dev, fb);
467 goto out;
468 }
469
470 fb->board->remove(fb);
471 free_fb:
472 kfree(fb);
473 free_region:
474 amba_release_regions(dev);
475 out:
476 return ret;
477 }
478
479 static int clcdfb_remove(struct amba_device *dev)
480 {
481 struct clcd_fb *fb = amba_get_drvdata(dev);
482
483 amba_set_drvdata(dev, NULL);
484
485 clcdfb_disable(fb);
486 unregister_framebuffer(&fb->fb);
487 iounmap(fb->regs);
488 clk_put(fb->clk);
489
490 fb->board->remove(fb);
491
492 kfree(fb);
493
494 amba_release_regions(dev);
495
496 return 0;
497 }
498
499 static struct amba_id clcdfb_id_table[] = {
500 {
501 .id = 0x00041110,
502 .mask = 0x000ffffe,
503 },
504 { 0, 0 },
505 };
506
507 static struct amba_driver clcd_driver = {
508 .drv = {
509 .name = "clcd-pl11x",
510 },
511 .probe = clcdfb_probe,
512 .remove = clcdfb_remove,
513 .id_table = clcdfb_id_table,
514 };
515
516 static int __init amba_clcdfb_init(void)
517 {
518 if (fb_get_options("ambafb", NULL))
519 return -ENODEV;
520
521 return amba_driver_register(&clcd_driver);
522 }
523
524 module_init(amba_clcdfb_init);
525
526 static void __exit amba_clcdfb_exit(void)
527 {
528 amba_driver_unregister(&clcd_driver);
529 }
530
531 module_exit(amba_clcdfb_exit);
532
533 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
534 MODULE_LICENSE("GPL");
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