1 /*
2 * BRIEF MODULE DESCRIPTION
3 * Au1100 LCD Driver.
4 *
5 * Rewritten for 2.6 by Embedded Alley Solutions
6 * <source@embeddedalley.com>, based on submissions by
7 * Karl Lessard <klessard@sunrisetelecom.com>
8 * <c.pellegrin@exadron.com>
9 *
10 * PM support added by Rodolfo Giometti <giometti@linux.it>
11 * Cursor enable/disable by Rodolfo Giometti <giometti@linux.it>
12 *
13 * Copyright 2002 MontaVista Software
14 * Author: MontaVista Software, Inc.
15 * ppopov@mvista.com or source@mvista.com
16 *
17 * Copyright 2002 Alchemy Semiconductor
18 * Author: Alchemy Semiconductor
19 *
20 * Based on:
21 * linux/drivers/video/skeletonfb.c -- Skeleton for a frame buffer device
22 * Created 28 Dec 1997 by Geert Uytterhoeven
23 *
24 * This program is free software; you can redistribute it and/or modify it
25 * under the terms of the GNU General Public License as published by the
26 * Free Software Foundation; either version 2 of the License, or (at your
27 * option) any later version.
28 *
29 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
30 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
31 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
32 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
35 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
36 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * You should have received a copy of the GNU General Public License along
41 * with this program; if not, write to the Free Software Foundation, Inc.,
42 * 675 Mass Ave, Cambridge, MA 02139, USA.
43 */
44 #include <linux/clk.h>
45 #include <linux/module.h>
46 #include <linux/kernel.h>
47 #include <linux/errno.h>
48 #include <linux/string.h>
49 #include <linux/mm.h>
50 #include <linux/fb.h>
51 #include <linux/init.h>
52 #include <linux/interrupt.h>
53 #include <linux/ctype.h>
54 #include <linux/dma-mapping.h>
55 #include <linux/platform_device.h>
56 #include <linux/slab.h>
57
58 #include <asm/mach-au1x00/au1000.h>
59
60 #define DEBUG 0
61
62 #include "au1100fb.h"
63
64 #define DRIVER_NAME "au1100fb"
65 #define DRIVER_DESC "LCD controller driver for AU1100 processors"
66
67 #define to_au1100fb_device(_info) \
68 (_info ? container_of(_info, struct au1100fb_device, info) : NULL);
69
70 /* Bitfields format supported by the controller. Note that the order of formats
71 * SHOULD be the same as in the LCD_CONTROL_SBPPF field, so we can retrieve the
72 * right pixel format by doing rgb_bitfields[LCD_CONTROL_SBPPF_XXX >> LCD_CONTROL_SBPPF]
73 */
74 struct fb_bitfield rgb_bitfields[][4] =
75 {
76 /* Red, Green, Blue, Transp */
77 { { 10, 6, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },
78 { { 11, 5, 0 }, { 5, 6, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },
79 { { 11, 5, 0 }, { 6, 5, 0 }, { 0, 6, 0 }, { 0, 0, 0 } },
80 { { 10, 5, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 15, 1, 0 } },
81 { { 11, 5, 0 }, { 6, 5, 0 }, { 1, 5, 0 }, { 0, 1, 0 } },
82
83 /* The last is used to describe 12bpp format */
84 { { 8, 4, 0 }, { 4, 4, 0 }, { 0, 4, 0 }, { 0, 0, 0 } },
85 };
86
87 static struct fb_fix_screeninfo au1100fb_fix = {
88 .id = "AU1100 FB",
89 .xpanstep = 1,
90 .ypanstep = 1,
91 .type = FB_TYPE_PACKED_PIXELS,
92 .accel = FB_ACCEL_NONE,
93 };
94
95 static struct fb_var_screeninfo au1100fb_var = {
96 .activate = FB_ACTIVATE_NOW,
97 .height = -1,
98 .width = -1,
99 .vmode = FB_VMODE_NONINTERLACED,
100 };
101
102 /* fb_blank
103 * Blank the screen. Depending on the mode, the screen will be
104 * activated with the backlight color, or desactivated
105 */
au1100fb_fb_blank(int blank_mode,struct fb_info * fbi)106 static int au1100fb_fb_blank(int blank_mode, struct fb_info *fbi)
107 {
108 struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
109
110 print_dbg("fb_blank %d %p", blank_mode, fbi);
111
112 switch (blank_mode) {
113
114 case VESA_NO_BLANKING:
115 /* Turn on panel */
116 fbdev->regs->lcd_control |= LCD_CONTROL_GO;
117 wmb(); /* drain writebuffer */
118 break;
119
120 case VESA_VSYNC_SUSPEND:
121 case VESA_HSYNC_SUSPEND:
122 case VESA_POWERDOWN:
123 /* Turn off panel */
124 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
125 wmb(); /* drain writebuffer */
126 break;
127 default:
128 break;
129
130 }
131 return 0;
132 }
133
134 /*
135 * Set hardware with var settings. This will enable the controller with a specific
136 * mode, normally validated with the fb_check_var method
137 */
au1100fb_setmode(struct au1100fb_device * fbdev)138 int au1100fb_setmode(struct au1100fb_device *fbdev)
139 {
140 struct fb_info *info = &fbdev->info;
141 u32 words;
142 int index;
143
144 if (!fbdev)
145 return -EINVAL;
146
147 /* Update var-dependent FB info */
148 if (panel_is_active(fbdev->panel) || panel_is_color(fbdev->panel)) {
149 if (info->var.bits_per_pixel <= 8) {
150 /* palettized */
151 info->var.red.offset = 0;
152 info->var.red.length = info->var.bits_per_pixel;
153 info->var.red.msb_right = 0;
154
155 info->var.green.offset = 0;
156 info->var.green.length = info->var.bits_per_pixel;
157 info->var.green.msb_right = 0;
158
159 info->var.blue.offset = 0;
160 info->var.blue.length = info->var.bits_per_pixel;
161 info->var.blue.msb_right = 0;
162
163 info->var.transp.offset = 0;
164 info->var.transp.length = 0;
165 info->var.transp.msb_right = 0;
166
167 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
168 info->fix.line_length = info->var.xres_virtual /
169 (8/info->var.bits_per_pixel);
170 } else {
171 /* non-palettized */
172 index = (fbdev->panel->control_base & LCD_CONTROL_SBPPF_MASK) >> LCD_CONTROL_SBPPF_BIT;
173 info->var.red = rgb_bitfields[index][0];
174 info->var.green = rgb_bitfields[index][1];
175 info->var.blue = rgb_bitfields[index][2];
176 info->var.transp = rgb_bitfields[index][3];
177
178 info->fix.visual = FB_VISUAL_TRUECOLOR;
179 info->fix.line_length = info->var.xres_virtual << 1; /* depth=16 */
180 }
181 } else {
182 /* mono */
183 info->fix.visual = FB_VISUAL_MONO10;
184 info->fix.line_length = info->var.xres_virtual / 8;
185 }
186
187 info->screen_size = info->fix.line_length * info->var.yres_virtual;
188 info->var.rotate = ((fbdev->panel->control_base&LCD_CONTROL_SM_MASK) \
189 >> LCD_CONTROL_SM_BIT) * 90;
190
191 /* Determine BPP mode and format */
192 fbdev->regs->lcd_control = fbdev->panel->control_base;
193 fbdev->regs->lcd_horztiming = fbdev->panel->horztiming;
194 fbdev->regs->lcd_verttiming = fbdev->panel->verttiming;
195 fbdev->regs->lcd_clkcontrol = fbdev->panel->clkcontrol_base;
196 fbdev->regs->lcd_intenable = 0;
197 fbdev->regs->lcd_intstatus = 0;
198 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(fbdev->fb_phys);
199
200 if (panel_is_dual(fbdev->panel)) {
201 /* Second panel display seconf half of screen if possible,
202 * otherwise display the same as the first panel */
203 if (info->var.yres_virtual >= (info->var.yres << 1)) {
204 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys +
205 (info->fix.line_length *
206 (info->var.yres_virtual >> 1)));
207 } else {
208 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys);
209 }
210 }
211
212 words = info->fix.line_length / sizeof(u32);
213 if (!info->var.rotate || (info->var.rotate == 180)) {
214 words *= info->var.yres_virtual;
215 if (info->var.rotate /* 180 */) {
216 words -= (words % 8); /* should be divisable by 8 */
217 }
218 }
219 fbdev->regs->lcd_words = LCD_WRD_WRDS_N(words);
220
221 fbdev->regs->lcd_pwmdiv = 0;
222 fbdev->regs->lcd_pwmhi = 0;
223
224 /* Resume controller */
225 fbdev->regs->lcd_control |= LCD_CONTROL_GO;
226 mdelay(10);
227 au1100fb_fb_blank(VESA_NO_BLANKING, info);
228
229 return 0;
230 }
231
232 /* fb_setcolreg
233 * Set color in LCD palette.
234 */
au1100fb_fb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * fbi)235 int au1100fb_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi)
236 {
237 struct au1100fb_device *fbdev;
238 u32 *palette;
239 u32 value;
240
241 fbdev = to_au1100fb_device(fbi);
242 palette = fbdev->regs->lcd_pallettebase;
243
244 if (regno > (AU1100_LCD_NBR_PALETTE_ENTRIES - 1))
245 return -EINVAL;
246
247 if (fbi->var.grayscale) {
248 /* Convert color to grayscale */
249 red = green = blue =
250 (19595 * red + 38470 * green + 7471 * blue) >> 16;
251 }
252
253 if (fbi->fix.visual == FB_VISUAL_TRUECOLOR) {
254 /* Place color in the pseudopalette */
255 if (regno > 16)
256 return -EINVAL;
257
258 palette = (u32*)fbi->pseudo_palette;
259
260 red >>= (16 - fbi->var.red.length);
261 green >>= (16 - fbi->var.green.length);
262 blue >>= (16 - fbi->var.blue.length);
263
264 value = (red << fbi->var.red.offset) |
265 (green << fbi->var.green.offset)|
266 (blue << fbi->var.blue.offset);
267 value &= 0xFFFF;
268
269 } else if (panel_is_active(fbdev->panel)) {
270 /* COLOR TFT PALLETTIZED (use RGB 565) */
271 value = (red & 0xF800)|((green >> 5) & 0x07E0)|((blue >> 11) & 0x001F);
272 value &= 0xFFFF;
273
274 } else if (panel_is_color(fbdev->panel)) {
275 /* COLOR STN MODE */
276 value = (((panel_swap_rgb(fbdev->panel) ? blue : red) >> 12) & 0x000F) |
277 ((green >> 8) & 0x00F0) |
278 (((panel_swap_rgb(fbdev->panel) ? red : blue) >> 4) & 0x0F00);
279 value &= 0xFFF;
280 } else {
281 /* MONOCHROME MODE */
282 value = (green >> 12) & 0x000F;
283 value &= 0xF;
284 }
285
286 palette[regno] = value;
287
288 return 0;
289 }
290
291 /* fb_pan_display
292 * Pan display in x and/or y as specified
293 */
au1100fb_fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * fbi)294 int au1100fb_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
295 {
296 struct au1100fb_device *fbdev;
297 int dy;
298
299 fbdev = to_au1100fb_device(fbi);
300
301 print_dbg("fb_pan_display %p %p", var, fbi);
302
303 if (!var || !fbdev) {
304 return -EINVAL;
305 }
306
307 if (var->xoffset - fbi->var.xoffset) {
308 /* No support for X panning for now! */
309 return -EINVAL;
310 }
311
312 print_dbg("fb_pan_display 2 %p %p", var, fbi);
313 dy = var->yoffset - fbi->var.yoffset;
314 if (dy) {
315
316 u32 dmaaddr;
317
318 print_dbg("Panning screen of %d lines", dy);
319
320 dmaaddr = fbdev->regs->lcd_dmaaddr0;
321 dmaaddr += (fbi->fix.line_length * dy);
322
323 /* TODO: Wait for current frame to finished */
324 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
325
326 if (panel_is_dual(fbdev->panel)) {
327 dmaaddr = fbdev->regs->lcd_dmaaddr1;
328 dmaaddr += (fbi->fix.line_length * dy);
329 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
330 }
331 }
332 print_dbg("fb_pan_display 3 %p %p", var, fbi);
333
334 return 0;
335 }
336
337 /* fb_mmap
338 * Map video memory in user space. We don't use the generic fb_mmap method mainly
339 * to allow the use of the TLB streaming flag (CCA=6)
340 */
au1100fb_fb_mmap(struct fb_info * fbi,struct vm_area_struct * vma)341 int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
342 {
343 struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
344
345 pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6
346
347 return dma_mmap_coherent(fbdev->dev, vma, fbdev->fb_mem, fbdev->fb_phys,
348 fbdev->fb_len);
349 }
350
351 static const struct fb_ops au1100fb_ops =
352 {
353 .owner = THIS_MODULE,
354 .fb_setcolreg = au1100fb_fb_setcolreg,
355 .fb_blank = au1100fb_fb_blank,
356 .fb_pan_display = au1100fb_fb_pan_display,
357 .fb_fillrect = cfb_fillrect,
358 .fb_copyarea = cfb_copyarea,
359 .fb_imageblit = cfb_imageblit,
360 .fb_mmap = au1100fb_fb_mmap,
361 };
362
363
364 /*-------------------------------------------------------------------------*/
365
au1100fb_setup(struct au1100fb_device * fbdev)366 static int au1100fb_setup(struct au1100fb_device *fbdev)
367 {
368 char *this_opt, *options;
369 int num_panels = ARRAY_SIZE(known_lcd_panels);
370
371 if (num_panels <= 0) {
372 print_err("No LCD panels supported by driver!");
373 return -ENODEV;
374 }
375
376 if (fb_get_options(DRIVER_NAME, &options))
377 return -ENODEV;
378 if (!options)
379 return -ENODEV;
380
381 while ((this_opt = strsep(&options, ",")) != NULL) {
382 /* Panel option */
383 if (!strncmp(this_opt, "panel:", 6)) {
384 int i;
385 this_opt += 6;
386 for (i = 0; i < num_panels; i++) {
387 if (!strncmp(this_opt, known_lcd_panels[i].name,
388 strlen(this_opt))) {
389 fbdev->panel = &known_lcd_panels[i];
390 fbdev->panel_idx = i;
391 break;
392 }
393 }
394 if (i >= num_panels) {
395 print_warn("Panel '%s' not supported!", this_opt);
396 return -ENODEV;
397 }
398 }
399 /* Unsupported option */
400 else
401 print_warn("Unsupported option \"%s\"", this_opt);
402 }
403
404 print_info("Panel=%s", fbdev->panel->name);
405
406 return 0;
407 }
408
au1100fb_drv_probe(struct platform_device * dev)409 static int au1100fb_drv_probe(struct platform_device *dev)
410 {
411 struct au1100fb_device *fbdev;
412 struct resource *regs_res;
413 struct clk *c;
414
415 /* Allocate new device private */
416 fbdev = devm_kzalloc(&dev->dev, sizeof(*fbdev), GFP_KERNEL);
417 if (!fbdev)
418 return -ENOMEM;
419
420 if (au1100fb_setup(fbdev))
421 goto failed;
422
423 platform_set_drvdata(dev, (void *)fbdev);
424 fbdev->dev = &dev->dev;
425
426 /* Allocate region for our registers and map them */
427 regs_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
428 if (!regs_res) {
429 print_err("fail to retrieve registers resource");
430 return -EFAULT;
431 }
432
433 au1100fb_fix.mmio_start = regs_res->start;
434 au1100fb_fix.mmio_len = resource_size(regs_res);
435
436 if (!devm_request_mem_region(&dev->dev,
437 au1100fb_fix.mmio_start,
438 au1100fb_fix.mmio_len,
439 DRIVER_NAME)) {
440 print_err("fail to lock memory region at 0x%08lx",
441 au1100fb_fix.mmio_start);
442 return -EBUSY;
443 }
444
445 fbdev->regs = (struct au1100fb_regs*)KSEG1ADDR(au1100fb_fix.mmio_start);
446
447 print_dbg("Register memory map at %p", fbdev->regs);
448 print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len);
449
450 c = clk_get(NULL, "lcd_intclk");
451 if (!IS_ERR(c)) {
452 fbdev->lcdclk = c;
453 clk_set_rate(c, 48000000);
454 clk_prepare_enable(c);
455 }
456
457 /* Allocate the framebuffer to the maximum screen size * nbr of video buffers */
458 fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres *
459 (fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS;
460
461 fbdev->fb_mem = dmam_alloc_coherent(&dev->dev,
462 PAGE_ALIGN(fbdev->fb_len),
463 &fbdev->fb_phys, GFP_KERNEL);
464 if (!fbdev->fb_mem) {
465 print_err("fail to allocate framebuffer (size: %dK))",
466 fbdev->fb_len / 1024);
467 return -ENOMEM;
468 }
469
470 au1100fb_fix.smem_start = fbdev->fb_phys;
471 au1100fb_fix.smem_len = fbdev->fb_len;
472
473 print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);
474 print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);
475
476 /* load the panel info into the var struct */
477 au1100fb_var.bits_per_pixel = fbdev->panel->bpp;
478 au1100fb_var.xres = fbdev->panel->xres;
479 au1100fb_var.xres_virtual = au1100fb_var.xres;
480 au1100fb_var.yres = fbdev->panel->yres;
481 au1100fb_var.yres_virtual = au1100fb_var.yres;
482
483 fbdev->info.screen_base = fbdev->fb_mem;
484 fbdev->info.fbops = &au1100fb_ops;
485 fbdev->info.fix = au1100fb_fix;
486
487 fbdev->info.pseudo_palette =
488 devm_kcalloc(&dev->dev, 16, sizeof(u32), GFP_KERNEL);
489 if (!fbdev->info.pseudo_palette)
490 return -ENOMEM;
491
492 if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
493 print_err("Fail to allocate colormap (%d entries)",
494 AU1100_LCD_NBR_PALETTE_ENTRIES);
495 return -EFAULT;
496 }
497
498 fbdev->info.var = au1100fb_var;
499
500 /* Set h/w registers */
501 au1100fb_setmode(fbdev);
502
503 /* Register new framebuffer */
504 if (register_framebuffer(&fbdev->info) < 0) {
505 print_err("cannot register new framebuffer");
506 goto failed;
507 }
508
509 return 0;
510
511 failed:
512 if (fbdev->lcdclk) {
513 clk_disable_unprepare(fbdev->lcdclk);
514 clk_put(fbdev->lcdclk);
515 }
516 if (fbdev->info.cmap.len != 0) {
517 fb_dealloc_cmap(&fbdev->info.cmap);
518 }
519
520 return -ENODEV;
521 }
522
au1100fb_drv_remove(struct platform_device * dev)523 int au1100fb_drv_remove(struct platform_device *dev)
524 {
525 struct au1100fb_device *fbdev = NULL;
526
527 if (!dev)
528 return -ENODEV;
529
530 fbdev = platform_get_drvdata(dev);
531
532 #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
533 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
534 #endif
535 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
536
537 /* Clean up all probe data */
538 unregister_framebuffer(&fbdev->info);
539
540 fb_dealloc_cmap(&fbdev->info.cmap);
541
542 if (fbdev->lcdclk) {
543 clk_disable_unprepare(fbdev->lcdclk);
544 clk_put(fbdev->lcdclk);
545 }
546
547 return 0;
548 }
549
550 #ifdef CONFIG_PM
551 static struct au1100fb_regs fbregs;
552
au1100fb_drv_suspend(struct platform_device * dev,pm_message_t state)553 int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)
554 {
555 struct au1100fb_device *fbdev = platform_get_drvdata(dev);
556
557 if (!fbdev)
558 return 0;
559
560 /* Blank the LCD */
561 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
562
563 if (fbdev->lcdclk)
564 clk_disable(fbdev->lcdclk);
565
566 memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
567
568 return 0;
569 }
570
au1100fb_drv_resume(struct platform_device * dev)571 int au1100fb_drv_resume(struct platform_device *dev)
572 {
573 struct au1100fb_device *fbdev = platform_get_drvdata(dev);
574
575 if (!fbdev)
576 return 0;
577
578 memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
579
580 if (fbdev->lcdclk)
581 clk_enable(fbdev->lcdclk);
582
583 /* Unblank the LCD */
584 au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
585
586 return 0;
587 }
588 #else
589 #define au1100fb_drv_suspend NULL
590 #define au1100fb_drv_resume NULL
591 #endif
592
593 static struct platform_driver au1100fb_driver = {
594 .driver = {
595 .name = "au1100-lcd",
596 },
597 .probe = au1100fb_drv_probe,
598 .remove = au1100fb_drv_remove,
599 .suspend = au1100fb_drv_suspend,
600 .resume = au1100fb_drv_resume,
601 };
602 module_platform_driver(au1100fb_driver);
603
604 MODULE_DESCRIPTION(DRIVER_DESC);
605 MODULE_LICENSE("GPL");
606
