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Merge remote-tracking branch 'vfio/next'
[deliverable/linux.git] / drivers / video / fbdev / amba-clcd.c
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/bitops.h>
28 #include <linux/clk.h>
29 #include <linux/hardirq.h>
30 #include <linux/of.h>
31 #include <linux/of_address.h>
32 #include <linux/of_graph.h>
33 #include <linux/backlight.h>
34 #include <video/display_timing.h>
35 #include <video/of_display_timing.h>
36 #include <video/videomode.h>
37
38 #include "amba-clcd-nomadik.h"
39 #include "amba-clcd-versatile.h"
40
41 #define to_clcd(info) container_of(info, struct clcd_fb, fb)
42
43 /* This is limited to 16 characters when displayed by X startup */
44 static const char *clcd_name = "CLCD FB";
45
46 /*
47 * Unfortunately, the enable/disable functions may be called either from
48 * process or IRQ context, and we _need_ to delay. This is _not_ good.
49 */
50 static inline void clcdfb_sleep(unsigned int ms)
51 {
52 if (in_atomic()) {
53 mdelay(ms);
54 } else {
55 msleep(ms);
56 }
57 }
58
59 static inline void clcdfb_set_start(struct clcd_fb *fb)
60 {
61 unsigned long ustart = fb->fb.fix.smem_start;
62 unsigned long lstart;
63
64 ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
65 lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;
66
67 writel(ustart, fb->regs + CLCD_UBAS);
68 writel(lstart, fb->regs + CLCD_LBAS);
69 }
70
71 static void clcdfb_disable(struct clcd_fb *fb)
72 {
73 u32 val;
74
75 if (fb->board->disable)
76 fb->board->disable(fb);
77
78 if (fb->panel->backlight) {
79 fb->panel->backlight->props.power = FB_BLANK_POWERDOWN;
80 backlight_update_status(fb->panel->backlight);
81 }
82
83 val = readl(fb->regs + fb->off_cntl);
84 if (val & CNTL_LCDPWR) {
85 val &= ~CNTL_LCDPWR;
86 writel(val, fb->regs + fb->off_cntl);
87
88 clcdfb_sleep(20);
89 }
90 if (val & CNTL_LCDEN) {
91 val &= ~CNTL_LCDEN;
92 writel(val, fb->regs + fb->off_cntl);
93 }
94
95 /*
96 * Disable CLCD clock source.
97 */
98 if (fb->clk_enabled) {
99 fb->clk_enabled = false;
100 clk_disable(fb->clk);
101 }
102 }
103
104 static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
105 {
106 /*
107 * Enable the CLCD clock source.
108 */
109 if (!fb->clk_enabled) {
110 fb->clk_enabled = true;
111 clk_enable(fb->clk);
112 }
113
114 /*
115 * Bring up by first enabling..
116 */
117 cntl |= CNTL_LCDEN;
118 writel(cntl, fb->regs + fb->off_cntl);
119
120 clcdfb_sleep(20);
121
122 /*
123 * and now apply power.
124 */
125 cntl |= CNTL_LCDPWR;
126 writel(cntl, fb->regs + fb->off_cntl);
127
128 /*
129 * Turn on backlight
130 */
131 if (fb->panel->backlight) {
132 fb->panel->backlight->props.power = FB_BLANK_UNBLANK;
133 backlight_update_status(fb->panel->backlight);
134 }
135
136 /*
137 * finally, enable the interface.
138 */
139 if (fb->board->enable)
140 fb->board->enable(fb);
141 }
142
143 static int
144 clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
145 {
146 u32 caps;
147 int ret = 0;
148
149 if (fb->panel->caps && fb->board->caps)
150 caps = fb->panel->caps & fb->board->caps;
151 else {
152 /* Old way of specifying what can be used */
153 caps = fb->panel->cntl & CNTL_BGR ?
154 CLCD_CAP_BGR : CLCD_CAP_RGB;
155 /* But mask out 444 modes as they weren't supported */
156 caps &= ~CLCD_CAP_444;
157 }
158
159 /* Only TFT panels can do RGB888/BGR888 */
160 if (!(fb->panel->cntl & CNTL_LCDTFT))
161 caps &= ~CLCD_CAP_888;
162
163 memset(&var->transp, 0, sizeof(var->transp));
164
165 var->red.msb_right = 0;
166 var->green.msb_right = 0;
167 var->blue.msb_right = 0;
168
169 switch (var->bits_per_pixel) {
170 case 1:
171 case 2:
172 case 4:
173 case 8:
174 /* If we can't do 5551, reject */
175 caps &= CLCD_CAP_5551;
176 if (!caps) {
177 ret = -EINVAL;
178 break;
179 }
180
181 var->red.length = var->bits_per_pixel;
182 var->red.offset = 0;
183 var->green.length = var->bits_per_pixel;
184 var->green.offset = 0;
185 var->blue.length = var->bits_per_pixel;
186 var->blue.offset = 0;
187 break;
188
189 case 16:
190 /* If we can't do 444, 5551 or 565, reject */
191 if (!(caps & (CLCD_CAP_444 | CLCD_CAP_5551 | CLCD_CAP_565))) {
192 ret = -EINVAL;
193 break;
194 }
195
196 /*
197 * Green length can be 4, 5 or 6 depending whether
198 * we're operating in 444, 5551 or 565 mode.
199 */
200 if (var->green.length == 4 && caps & CLCD_CAP_444)
201 caps &= CLCD_CAP_444;
202 if (var->green.length == 5 && caps & CLCD_CAP_5551)
203 caps &= CLCD_CAP_5551;
204 else if (var->green.length == 6 && caps & CLCD_CAP_565)
205 caps &= CLCD_CAP_565;
206 else {
207 /*
208 * PL110 officially only supports RGB555,
209 * but may be wired up to allow RGB565.
210 */
211 if (caps & CLCD_CAP_565) {
212 var->green.length = 6;
213 caps &= CLCD_CAP_565;
214 } else if (caps & CLCD_CAP_5551) {
215 var->green.length = 5;
216 caps &= CLCD_CAP_5551;
217 } else {
218 var->green.length = 4;
219 caps &= CLCD_CAP_444;
220 }
221 }
222
223 if (var->green.length >= 5) {
224 var->red.length = 5;
225 var->blue.length = 5;
226 } else {
227 var->red.length = 4;
228 var->blue.length = 4;
229 }
230 break;
231 case 24:
232 if (fb->vendor->packed_24_bit_pixels) {
233 var->red.length = 8;
234 var->green.length = 8;
235 var->blue.length = 8;
236 } else {
237 ret = -EINVAL;
238 }
239 break;
240 case 32:
241 /* If we can't do 888, reject */
242 caps &= CLCD_CAP_888;
243 if (!caps) {
244 ret = -EINVAL;
245 break;
246 }
247
248 var->red.length = 8;
249 var->green.length = 8;
250 var->blue.length = 8;
251 break;
252 default:
253 ret = -EINVAL;
254 break;
255 }
256
257 /*
258 * >= 16bpp displays have separate colour component bitfields
259 * encoded in the pixel data. Calculate their position from
260 * the bitfield length defined above.
261 */
262 if (ret == 0 && var->bits_per_pixel >= 16) {
263 bool bgr, rgb;
264
265 bgr = caps & CLCD_CAP_BGR && var->blue.offset == 0;
266 rgb = caps & CLCD_CAP_RGB && var->red.offset == 0;
267
268 if (!bgr && !rgb)
269 /*
270 * The requested format was not possible, try just
271 * our capabilities. One of BGR or RGB must be
272 * supported.
273 */
274 bgr = caps & CLCD_CAP_BGR;
275
276 if (bgr) {
277 var->blue.offset = 0;
278 var->green.offset = var->blue.offset + var->blue.length;
279 var->red.offset = var->green.offset + var->green.length;
280 } else {
281 var->red.offset = 0;
282 var->green.offset = var->red.offset + var->red.length;
283 var->blue.offset = var->green.offset + var->green.length;
284 }
285 }
286
287 return ret;
288 }
289
290 static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
291 {
292 struct clcd_fb *fb = to_clcd(info);
293 int ret = -EINVAL;
294
295 if (fb->board->check)
296 ret = fb->board->check(fb, var);
297
298 if (ret == 0 &&
299 var->xres_virtual * var->bits_per_pixel / 8 *
300 var->yres_virtual > fb->fb.fix.smem_len)
301 ret = -EINVAL;
302
303 if (ret == 0)
304 ret = clcdfb_set_bitfields(fb, var);
305
306 return ret;
307 }
308
309 static int clcdfb_set_par(struct fb_info *info)
310 {
311 struct clcd_fb *fb = to_clcd(info);
312 struct clcd_regs regs;
313
314 fb->fb.fix.line_length = fb->fb.var.xres_virtual *
315 fb->fb.var.bits_per_pixel / 8;
316
317 if (fb->fb.var.bits_per_pixel <= 8)
318 fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
319 else
320 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
321
322 fb->board->decode(fb, &regs);
323
324 clcdfb_disable(fb);
325
326 /* Some variants must be clocked here */
327 if (fb->vendor->clock_timregs && !fb->clk_enabled) {
328 fb->clk_enabled = true;
329 clk_enable(fb->clk);
330 }
331
332 writel(regs.tim0, fb->regs + CLCD_TIM0);
333 writel(regs.tim1, fb->regs + CLCD_TIM1);
334 writel(regs.tim2, fb->regs + CLCD_TIM2);
335 writel(regs.tim3, fb->regs + CLCD_TIM3);
336
337 clcdfb_set_start(fb);
338
339 clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
340
341 fb->clcd_cntl = regs.cntl;
342
343 clcdfb_enable(fb, regs.cntl);
344
345 #ifdef DEBUG
346 printk(KERN_INFO
347 "CLCD: Registers set to\n"
348 " %08x %08x %08x %08x\n"
349 " %08x %08x %08x %08x\n",
350 readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
351 readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
352 readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
353 readl(fb->regs + fb->off_ienb), readl(fb->regs + fb->off_cntl));
354 #endif
355
356 return 0;
357 }
358
359 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
360 {
361 unsigned int mask = (1 << bf->length) - 1;
362
363 return (val >> (16 - bf->length) & mask) << bf->offset;
364 }
365
366 /*
367 * Set a single color register. The values supplied have a 16 bit
368 * magnitude. Return != 0 for invalid regno.
369 */
370 static int
371 clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
372 unsigned int blue, unsigned int transp, struct fb_info *info)
373 {
374 struct clcd_fb *fb = to_clcd(info);
375
376 if (regno < 16)
377 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
378 convert_bitfield(blue, &fb->fb.var.blue) |
379 convert_bitfield(green, &fb->fb.var.green) |
380 convert_bitfield(red, &fb->fb.var.red);
381
382 if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
383 int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
384 u32 val, mask, newval;
385
386 newval = (red >> 11) & 0x001f;
387 newval |= (green >> 6) & 0x03e0;
388 newval |= (blue >> 1) & 0x7c00;
389
390 /*
391 * 3.2.11: if we're configured for big endian
392 * byte order, the palette entries are swapped.
393 */
394 if (fb->clcd_cntl & CNTL_BEBO)
395 regno ^= 1;
396
397 if (regno & 1) {
398 newval <<= 16;
399 mask = 0x0000ffff;
400 } else {
401 mask = 0xffff0000;
402 }
403
404 val = readl(fb->regs + hw_reg) & mask;
405 writel(val | newval, fb->regs + hw_reg);
406 }
407
408 return regno > 255;
409 }
410
411 /*
412 * Blank the screen if blank_mode != 0, else unblank. If blank == NULL
413 * then the caller blanks by setting the CLUT (Color Look Up Table) to all
414 * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
415 * to e.g. a video mode which doesn't support it. Implements VESA suspend
416 * and powerdown modes on hardware that supports disabling hsync/vsync:
417 * blank_mode == 2: suspend vsync
418 * blank_mode == 3: suspend hsync
419 * blank_mode == 4: powerdown
420 */
421 static int clcdfb_blank(int blank_mode, struct fb_info *info)
422 {
423 struct clcd_fb *fb = to_clcd(info);
424
425 if (blank_mode != 0) {
426 clcdfb_disable(fb);
427 } else {
428 clcdfb_enable(fb, fb->clcd_cntl);
429 }
430 return 0;
431 }
432
433 static int clcdfb_mmap(struct fb_info *info,
434 struct vm_area_struct *vma)
435 {
436 struct clcd_fb *fb = to_clcd(info);
437 unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
438 int ret = -EINVAL;
439
440 len = info->fix.smem_len;
441
442 if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
443 fb->board->mmap)
444 ret = fb->board->mmap(fb, vma);
445
446 return ret;
447 }
448
449 static struct fb_ops clcdfb_ops = {
450 .owner = THIS_MODULE,
451 .fb_check_var = clcdfb_check_var,
452 .fb_set_par = clcdfb_set_par,
453 .fb_setcolreg = clcdfb_setcolreg,
454 .fb_blank = clcdfb_blank,
455 .fb_fillrect = cfb_fillrect,
456 .fb_copyarea = cfb_copyarea,
457 .fb_imageblit = cfb_imageblit,
458 .fb_mmap = clcdfb_mmap,
459 };
460
461 static int clcdfb_register(struct clcd_fb *fb)
462 {
463 int ret;
464
465 /*
466 * ARM PL111 always has IENB at 0x1c; it's only PL110
467 * which is reversed on some platforms.
468 */
469 if (amba_manf(fb->dev) == 0x41 && amba_part(fb->dev) == 0x111) {
470 fb->off_ienb = CLCD_PL111_IENB;
471 fb->off_cntl = CLCD_PL111_CNTL;
472 } else {
473 if (of_machine_is_compatible("arm,versatile-ab") ||
474 of_machine_is_compatible("arm,versatile-pb")) {
475 fb->off_ienb = CLCD_PL111_IENB;
476 fb->off_cntl = CLCD_PL111_CNTL;
477 } else {
478 fb->off_ienb = CLCD_PL110_IENB;
479 fb->off_cntl = CLCD_PL110_CNTL;
480 }
481 }
482
483 fb->clk = clk_get(&fb->dev->dev, NULL);
484 if (IS_ERR(fb->clk)) {
485 ret = PTR_ERR(fb->clk);
486 goto out;
487 }
488
489 ret = clk_prepare(fb->clk);
490 if (ret)
491 goto free_clk;
492
493 fb->fb.device = &fb->dev->dev;
494
495 fb->fb.fix.mmio_start = fb->dev->res.start;
496 fb->fb.fix.mmio_len = resource_size(&fb->dev->res);
497
498 fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
499 if (!fb->regs) {
500 printk(KERN_ERR "CLCD: unable to remap registers\n");
501 ret = -ENOMEM;
502 goto clk_unprep;
503 }
504
505 fb->fb.fbops = &clcdfb_ops;
506 fb->fb.flags = FBINFO_FLAG_DEFAULT;
507 fb->fb.pseudo_palette = fb->cmap;
508
509 strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
510 fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
511 fb->fb.fix.type_aux = 0;
512 fb->fb.fix.xpanstep = 0;
513 fb->fb.fix.ypanstep = 0;
514 fb->fb.fix.ywrapstep = 0;
515 fb->fb.fix.accel = FB_ACCEL_NONE;
516
517 fb->fb.var.xres = fb->panel->mode.xres;
518 fb->fb.var.yres = fb->panel->mode.yres;
519 fb->fb.var.xres_virtual = fb->panel->mode.xres;
520 fb->fb.var.yres_virtual = fb->panel->mode.yres;
521 fb->fb.var.bits_per_pixel = fb->panel->bpp;
522 fb->fb.var.grayscale = fb->panel->grayscale;
523 fb->fb.var.pixclock = fb->panel->mode.pixclock;
524 fb->fb.var.left_margin = fb->panel->mode.left_margin;
525 fb->fb.var.right_margin = fb->panel->mode.right_margin;
526 fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
527 fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
528 fb->fb.var.hsync_len = fb->panel->mode.hsync_len;
529 fb->fb.var.vsync_len = fb->panel->mode.vsync_len;
530 fb->fb.var.sync = fb->panel->mode.sync;
531 fb->fb.var.vmode = fb->panel->mode.vmode;
532 fb->fb.var.activate = FB_ACTIVATE_NOW;
533 fb->fb.var.nonstd = 0;
534 fb->fb.var.height = fb->panel->height;
535 fb->fb.var.width = fb->panel->width;
536 fb->fb.var.accel_flags = 0;
537
538 fb->fb.monspecs.hfmin = 0;
539 fb->fb.monspecs.hfmax = 100000;
540 fb->fb.monspecs.vfmin = 0;
541 fb->fb.monspecs.vfmax = 400;
542 fb->fb.monspecs.dclkmin = 1000000;
543 fb->fb.monspecs.dclkmax = 100000000;
544
545 /*
546 * Make sure that the bitfields are set appropriately.
547 */
548 clcdfb_set_bitfields(fb, &fb->fb.var);
549
550 /*
551 * Allocate colourmap.
552 */
553 ret = fb_alloc_cmap(&fb->fb.cmap, 256, 0);
554 if (ret)
555 goto unmap;
556
557 /*
558 * Ensure interrupts are disabled.
559 */
560 writel(0, fb->regs + fb->off_ienb);
561
562 fb_set_var(&fb->fb, &fb->fb.var);
563
564 dev_info(&fb->dev->dev, "%s hardware, %s display\n",
565 fb->board->name, fb->panel->mode.name);
566
567 ret = register_framebuffer(&fb->fb);
568 if (ret == 0)
569 goto out;
570
571 printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
572
573 fb_dealloc_cmap(&fb->fb.cmap);
574 unmap:
575 iounmap(fb->regs);
576 clk_unprep:
577 clk_unprepare(fb->clk);
578 free_clk:
579 clk_put(fb->clk);
580 out:
581 return ret;
582 }
583
584 #ifdef CONFIG_OF
585 static int clcdfb_of_get_dpi_panel_mode(struct device_node *node,
586 struct clcd_panel *clcd_panel)
587 {
588 int err;
589 struct display_timing timing;
590 struct videomode video;
591
592 err = of_get_display_timing(node, "panel-timing", &timing);
593 if (err)
594 return err;
595
596 videomode_from_timing(&timing, &video);
597
598 err = fb_videomode_from_videomode(&video, &clcd_panel->mode);
599 if (err)
600 return err;
601
602 /* Set up some inversion flags */
603 if (timing.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
604 clcd_panel->tim2 |= TIM2_IPC;
605 else if (!(timing.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE))
606 /*
607 * To preserve backwards compatibility, the IPC (inverted
608 * pixel clock) flag needs to be set on any display that
609 * doesn't explicitly specify that the pixel clock is
610 * active on the negative or positive edge.
611 */
612 clcd_panel->tim2 |= TIM2_IPC;
613
614 if (timing.flags & DISPLAY_FLAGS_HSYNC_LOW)
615 clcd_panel->tim2 |= TIM2_IHS;
616
617 if (timing.flags & DISPLAY_FLAGS_VSYNC_LOW)
618 clcd_panel->tim2 |= TIM2_IVS;
619
620 if (timing.flags & DISPLAY_FLAGS_DE_LOW)
621 clcd_panel->tim2 |= TIM2_IOE;
622
623 return 0;
624 }
625
626 static int clcdfb_snprintf_mode(char *buf, int size, struct fb_videomode *mode)
627 {
628 return snprintf(buf, size, "%ux%u@%u", mode->xres, mode->yres,
629 mode->refresh);
630 }
631
632 static int clcdfb_of_get_backlight(struct device_node *endpoint,
633 struct clcd_panel *clcd_panel)
634 {
635 struct device_node *panel;
636 struct device_node *backlight;
637
638 panel = of_graph_get_remote_port_parent(endpoint);
639 if (!panel)
640 return -ENODEV;
641
642 /* Look up the optional backlight phandle */
643 backlight = of_parse_phandle(panel, "backlight", 0);
644 if (backlight) {
645 clcd_panel->backlight = of_find_backlight_by_node(backlight);
646 of_node_put(backlight);
647
648 if (!clcd_panel->backlight)
649 return -EPROBE_DEFER;
650 }
651 return 0;
652 }
653
654 static int clcdfb_of_get_mode(struct device *dev, struct device_node *endpoint,
655 struct clcd_panel *clcd_panel)
656 {
657 int err;
658 struct device_node *panel;
659 struct fb_videomode *mode;
660 char *name;
661 int len;
662
663 panel = of_graph_get_remote_port_parent(endpoint);
664 if (!panel)
665 return -ENODEV;
666
667 /* Only directly connected DPI panels supported for now */
668 if (of_device_is_compatible(panel, "panel-dpi"))
669 err = clcdfb_of_get_dpi_panel_mode(panel, clcd_panel);
670 else
671 err = -ENOENT;
672 if (err)
673 return err;
674 mode = &clcd_panel->mode;
675
676 len = clcdfb_snprintf_mode(NULL, 0, mode);
677 name = devm_kzalloc(dev, len + 1, GFP_KERNEL);
678 if (!name)
679 return -ENOMEM;
680
681 clcdfb_snprintf_mode(name, len + 1, mode);
682 mode->name = name;
683
684 return 0;
685 }
686
687 static int clcdfb_of_init_tft_panel(struct clcd_fb *fb, u32 r0, u32 g0, u32 b0)
688 {
689 static struct {
690 unsigned int part;
691 u32 r0, g0, b0;
692 u32 caps;
693 } panels[] = {
694 { 0x110, 1, 7, 13, CLCD_CAP_5551 },
695 { 0x110, 0, 8, 16, CLCD_CAP_888 },
696 { 0x110, 16, 8, 0, CLCD_CAP_888 },
697 { 0x111, 4, 14, 20, CLCD_CAP_444 },
698 { 0x111, 3, 11, 19, CLCD_CAP_444 | CLCD_CAP_5551 },
699 { 0x111, 3, 10, 19, CLCD_CAP_444 | CLCD_CAP_5551 |
700 CLCD_CAP_565 },
701 { 0x111, 0, 8, 16, CLCD_CAP_444 | CLCD_CAP_5551 |
702 CLCD_CAP_565 | CLCD_CAP_888 },
703 };
704 int i;
705
706 /* Bypass pixel clock divider */
707 fb->panel->tim2 |= TIM2_BCD;
708
709 /* TFT display, vert. comp. interrupt at the start of the back porch */
710 fb->panel->cntl |= CNTL_LCDTFT | CNTL_LCDVCOMP(1);
711
712 fb->panel->caps = 0;
713
714 /* Match the setup with known variants */
715 for (i = 0; i < ARRAY_SIZE(panels) && !fb->panel->caps; i++) {
716 if (amba_part(fb->dev) != panels[i].part)
717 continue;
718 if (g0 != panels[i].g0)
719 continue;
720 if (r0 == panels[i].r0 && b0 == panels[i].b0)
721 fb->panel->caps = panels[i].caps;
722 }
723
724 /*
725 * If we actually physically connected the R lines to B and
726 * vice versa
727 */
728 if (r0 != 0 && b0 == 0)
729 fb->panel->bgr_connection = true;
730
731 if (fb->panel->caps && fb->vendor->st_bitmux_control) {
732 /*
733 * Set up the special bits for the Nomadik control register
734 * (other platforms tend to do this through an external
735 * register).
736 */
737
738 /* Offset of the highest used color */
739 int maxoff = max3(r0, g0, b0);
740 /* Most significant bit out, highest used bit */
741 int msb = 0;
742
743 if (fb->panel->caps & CLCD_CAP_888) {
744 msb = maxoff + 8 - 1;
745 } else if (fb->panel->caps & CLCD_CAP_565) {
746 msb = maxoff + 5 - 1;
747 fb->panel->cntl |= CNTL_ST_1XBPP_565;
748 } else if (fb->panel->caps & CLCD_CAP_5551) {
749 msb = maxoff + 5 - 1;
750 fb->panel->cntl |= CNTL_ST_1XBPP_5551;
751 } else if (fb->panel->caps & CLCD_CAP_444) {
752 msb = maxoff + 4 - 1;
753 fb->panel->cntl |= CNTL_ST_1XBPP_444;
754 }
755
756 /* Send out as many bits as we need */
757 if (msb > 17)
758 fb->panel->cntl |= CNTL_ST_CDWID_24;
759 else if (msb > 15)
760 fb->panel->cntl |= CNTL_ST_CDWID_18;
761 else if (msb > 11)
762 fb->panel->cntl |= CNTL_ST_CDWID_16;
763 else
764 fb->panel->cntl |= CNTL_ST_CDWID_12;
765 }
766
767 return fb->panel->caps ? 0 : -EINVAL;
768 }
769
770 static int clcdfb_of_init_display(struct clcd_fb *fb)
771 {
772 struct device_node *endpoint;
773 int err;
774 unsigned int bpp;
775 u32 max_bandwidth;
776 u32 tft_r0b0g0[3];
777
778 fb->panel = devm_kzalloc(&fb->dev->dev, sizeof(*fb->panel), GFP_KERNEL);
779 if (!fb->panel)
780 return -ENOMEM;
781
782 /*
783 * Fetch the panel endpoint.
784 */
785 endpoint = of_graph_get_next_endpoint(fb->dev->dev.of_node, NULL);
786 if (!endpoint)
787 return -ENODEV;
788
789 if (fb->vendor->init_panel) {
790 err = fb->vendor->init_panel(fb, endpoint);
791 if (err)
792 return err;
793 }
794
795 err = clcdfb_of_get_backlight(endpoint, fb->panel);
796 if (err)
797 return err;
798
799 err = clcdfb_of_get_mode(&fb->dev->dev, endpoint, fb->panel);
800 if (err)
801 return err;
802
803 err = of_property_read_u32(fb->dev->dev.of_node, "max-memory-bandwidth",
804 &max_bandwidth);
805 if (!err) {
806 /*
807 * max_bandwidth is in bytes per second and pixclock in
808 * pico-seconds, so the maximum allowed bits per pixel is
809 * 8 * max_bandwidth / (PICOS2KHZ(pixclock) * 1000)
810 * Rearrange this calculation to avoid overflow and then ensure
811 * result is a valid format.
812 */
813 bpp = max_bandwidth / (1000 / 8)
814 / PICOS2KHZ(fb->panel->mode.pixclock);
815 bpp = rounddown_pow_of_two(bpp);
816 if (bpp > 32)
817 bpp = 32;
818 } else
819 bpp = 32;
820 fb->panel->bpp = bpp;
821
822 #ifdef CONFIG_CPU_BIG_ENDIAN
823 fb->panel->cntl |= CNTL_BEBO;
824 #endif
825 fb->panel->width = -1;
826 fb->panel->height = -1;
827
828 if (of_property_read_u32_array(endpoint,
829 "arm,pl11x,tft-r0g0b0-pads",
830 tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) != 0)
831 return -ENOENT;
832
833 return clcdfb_of_init_tft_panel(fb, tft_r0b0g0[0],
834 tft_r0b0g0[1], tft_r0b0g0[2]);
835 }
836
837 static int clcdfb_of_vram_setup(struct clcd_fb *fb)
838 {
839 int err;
840 struct device_node *memory;
841 u64 size;
842
843 err = clcdfb_of_init_display(fb);
844 if (err)
845 return err;
846
847 memory = of_parse_phandle(fb->dev->dev.of_node, "memory-region", 0);
848 if (!memory)
849 return -ENODEV;
850
851 fb->fb.screen_base = of_iomap(memory, 0);
852 if (!fb->fb.screen_base)
853 return -ENOMEM;
854
855 fb->fb.fix.smem_start = of_translate_address(memory,
856 of_get_address(memory, 0, &size, NULL));
857 fb->fb.fix.smem_len = size;
858
859 return 0;
860 }
861
862 static int clcdfb_of_vram_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
863 {
864 unsigned long off, user_size, kernel_size;
865
866
867 off = vma->vm_pgoff << PAGE_SHIFT;
868 user_size = vma->vm_end - vma->vm_start;
869 kernel_size = fb->fb.fix.smem_len;
870
871 if (off >= kernel_size || user_size > (kernel_size - off))
872 return -ENXIO;
873
874 return remap_pfn_range(vma, vma->vm_start,
875 __phys_to_pfn(fb->fb.fix.smem_start) + vma->vm_pgoff,
876 user_size,
877 pgprot_writecombine(vma->vm_page_prot));
878 }
879
880 static void clcdfb_of_vram_remove(struct clcd_fb *fb)
881 {
882 iounmap(fb->fb.screen_base);
883 }
884
885 static int clcdfb_of_dma_setup(struct clcd_fb *fb)
886 {
887 unsigned long framesize;
888 dma_addr_t dma;
889 int err;
890
891 err = clcdfb_of_init_display(fb);
892 if (err)
893 return err;
894
895 framesize = fb->panel->mode.xres * fb->panel->mode.yres *
896 fb->panel->bpp / 8;
897 fb->fb.screen_base = dma_alloc_coherent(&fb->dev->dev, framesize,
898 &dma, GFP_KERNEL);
899 if (!fb->fb.screen_base)
900 return -ENOMEM;
901
902 fb->fb.fix.smem_start = dma;
903 fb->fb.fix.smem_len = framesize;
904
905 return 0;
906 }
907
908 static int clcdfb_of_dma_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
909 {
910 return dma_mmap_wc(&fb->dev->dev, vma, fb->fb.screen_base,
911 fb->fb.fix.smem_start, fb->fb.fix.smem_len);
912 }
913
914 static void clcdfb_of_dma_remove(struct clcd_fb *fb)
915 {
916 dma_free_coherent(&fb->dev->dev, fb->fb.fix.smem_len,
917 fb->fb.screen_base, fb->fb.fix.smem_start);
918 }
919
920 static struct clcd_board *clcdfb_of_get_board(struct amba_device *dev)
921 {
922 struct clcd_board *board = devm_kzalloc(&dev->dev, sizeof(*board),
923 GFP_KERNEL);
924 struct device_node *node = dev->dev.of_node;
925
926 if (!board)
927 return NULL;
928
929 board->name = of_node_full_name(node);
930 board->caps = CLCD_CAP_ALL;
931 board->check = clcdfb_check;
932 board->decode = clcdfb_decode;
933 if (of_find_property(node, "memory-region", NULL)) {
934 board->setup = clcdfb_of_vram_setup;
935 board->mmap = clcdfb_of_vram_mmap;
936 board->remove = clcdfb_of_vram_remove;
937 } else {
938 board->setup = clcdfb_of_dma_setup;
939 board->mmap = clcdfb_of_dma_mmap;
940 board->remove = clcdfb_of_dma_remove;
941 }
942
943 return board;
944 }
945 #else
946 static struct clcd_board *clcdfb_of_get_board(struct amba_device *dev)
947 {
948 return NULL;
949 }
950 #endif
951
952 static int clcdfb_probe(struct amba_device *dev, const struct amba_id *id)
953 {
954 struct clcd_board *board = dev_get_platdata(&dev->dev);
955 struct clcd_vendor_data *vendor = id->data;
956 struct clcd_fb *fb;
957 int ret;
958
959 if (!board)
960 board = clcdfb_of_get_board(dev);
961
962 if (!board)
963 return -EINVAL;
964
965 if (vendor->init_board) {
966 ret = vendor->init_board(dev, board);
967 if (ret)
968 return ret;
969 }
970
971 ret = dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
972 if (ret)
973 goto out;
974
975 ret = amba_request_regions(dev, NULL);
976 if (ret) {
977 printk(KERN_ERR "CLCD: unable to reserve regs region\n");
978 goto out;
979 }
980
981 fb = kzalloc(sizeof(struct clcd_fb), GFP_KERNEL);
982 if (!fb) {
983 printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
984 ret = -ENOMEM;
985 goto free_region;
986 }
987
988 fb->dev = dev;
989 fb->vendor = vendor;
990 fb->board = board;
991
992 dev_info(&fb->dev->dev, "PL%03x designer %02x rev%u at 0x%08llx\n",
993 amba_part(dev), amba_manf(dev), amba_rev(dev),
994 (unsigned long long)dev->res.start);
995
996 ret = fb->board->setup(fb);
997 if (ret)
998 goto free_fb;
999
1000 ret = clcdfb_register(fb);
1001 if (ret == 0) {
1002 amba_set_drvdata(dev, fb);
1003 goto out;
1004 }
1005
1006 fb->board->remove(fb);
1007 free_fb:
1008 kfree(fb);
1009 free_region:
1010 amba_release_regions(dev);
1011 out:
1012 return ret;
1013 }
1014
1015 static int clcdfb_remove(struct amba_device *dev)
1016 {
1017 struct clcd_fb *fb = amba_get_drvdata(dev);
1018
1019 clcdfb_disable(fb);
1020 unregister_framebuffer(&fb->fb);
1021 if (fb->fb.cmap.len)
1022 fb_dealloc_cmap(&fb->fb.cmap);
1023 iounmap(fb->regs);
1024 clk_unprepare(fb->clk);
1025 clk_put(fb->clk);
1026
1027 fb->board->remove(fb);
1028
1029 kfree(fb);
1030
1031 amba_release_regions(dev);
1032
1033 return 0;
1034 }
1035
1036 static struct clcd_vendor_data vendor_arm = {
1037 /* Sets up the versatile board displays */
1038 .init_panel = versatile_clcd_init_panel,
1039 };
1040
1041 static struct clcd_vendor_data vendor_nomadik = {
1042 .clock_timregs = true,
1043 .packed_24_bit_pixels = true,
1044 .st_bitmux_control = true,
1045 .init_board = nomadik_clcd_init_board,
1046 .init_panel = nomadik_clcd_init_panel,
1047 };
1048
1049 static struct amba_id clcdfb_id_table[] = {
1050 {
1051 .id = 0x00041110,
1052 .mask = 0x000ffffe,
1053 .data = &vendor_arm,
1054 },
1055 /* ST Electronics Nomadik variant */
1056 {
1057 .id = 0x00180110,
1058 .mask = 0x00fffffe,
1059 .data = &vendor_nomadik,
1060 },
1061 { 0, 0 },
1062 };
1063
1064 MODULE_DEVICE_TABLE(amba, clcdfb_id_table);
1065
1066 static struct amba_driver clcd_driver = {
1067 .drv = {
1068 .name = "clcd-pl11x",
1069 },
1070 .probe = clcdfb_probe,
1071 .remove = clcdfb_remove,
1072 .id_table = clcdfb_id_table,
1073 };
1074
1075 static int __init amba_clcdfb_init(void)
1076 {
1077 if (fb_get_options("ambafb", NULL))
1078 return -ENODEV;
1079
1080 return amba_driver_register(&clcd_driver);
1081 }
1082
1083 module_init(amba_clcdfb_init);
1084
1085 static void __exit amba_clcdfb_exit(void)
1086 {
1087 amba_driver_unregister(&clcd_driver);
1088 }
1089
1090 module_exit(amba_clcdfb_exit);
1091
1092 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
1093 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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