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