1 /*
2 * BRIEF MODULE DESCRIPTION
3 * Au1100 LCD Driver.
4 *
5 * Rewritten for 2.6 by Embedded Alley Solutions
6 * <[email protected]>, based on submissions by
7 * Karl Lessard <[email protected]>
8 * <[email protected]>
9 *
10 * PM support added by Rodolfo Giometti <[email protected]>
11 * Cursor enable/disable by Rodolfo Giometti <[email protected]>
12 *
13 * Copyright 2002 MontaVista Software
14 * Author: MontaVista Software, Inc.
15 * [email protected] or [email protected]
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;
141 u32 words;
142 int index;
143
144 if (!fbdev)
145 return -EINVAL;
146
147 info = &fbdev->info;
148
149 /* Update var-dependent FB info */
150 if (panel_is_active(fbdev->panel) || panel_is_color(fbdev->panel)) {
151 if (info->var.bits_per_pixel <= 8) {
152 /* palettized */
153 info->var.red.offset = 0;
154 info->var.red.length = info->var.bits_per_pixel;
155 info->var.red.msb_right = 0;
156
157 info->var.green.offset = 0;
158 info->var.green.length = info->var.bits_per_pixel;
159 info->var.green.msb_right = 0;
160
161 info->var.blue.offset = 0;
162 info->var.blue.length = info->var.bits_per_pixel;
163 info->var.blue.msb_right = 0;
164
165 info->var.transp.offset = 0;
166 info->var.transp.length = 0;
167 info->var.transp.msb_right = 0;
168
169 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
170 info->fix.line_length = info->var.xres_virtual /
171 (8/info->var.bits_per_pixel);
172 } else {
173 /* non-palettized */
174 index = (fbdev->panel->control_base & LCD_CONTROL_SBPPF_MASK) >> LCD_CONTROL_SBPPF_BIT;
175 info->var.red = rgb_bitfields[index][0];
176 info->var.green = rgb_bitfields[index][1];
177 info->var.blue = rgb_bitfields[index][2];
178 info->var.transp = rgb_bitfields[index][3];
179
180 info->fix.visual = FB_VISUAL_TRUECOLOR;
181 info->fix.line_length = info->var.xres_virtual << 1; /* depth=16 */
182 }
183 } else {
184 /* mono */
185 info->fix.visual = FB_VISUAL_MONO10;
186 info->fix.line_length = info->var.xres_virtual / 8;
187 }
188
189 info->screen_size = info->fix.line_length * info->var.yres_virtual;
190 info->var.rotate = ((fbdev->panel->control_base&LCD_CONTROL_SM_MASK) \
191 >> LCD_CONTROL_SM_BIT) * 90;
192
193 /* Determine BPP mode and format */
194 fbdev->regs->lcd_control = fbdev->panel->control_base;
195 fbdev->regs->lcd_horztiming = fbdev->panel->horztiming;
196 fbdev->regs->lcd_verttiming = fbdev->panel->verttiming;
197 fbdev->regs->lcd_clkcontrol = fbdev->panel->clkcontrol_base;
198 fbdev->regs->lcd_intenable = 0;
199 fbdev->regs->lcd_intstatus = 0;
200 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(fbdev->fb_phys);
201
202 if (panel_is_dual(fbdev->panel)) {
203 /* Second panel display seconf half of screen if possible,
204 * otherwise display the same as the first panel */
205 if (info->var.yres_virtual >= (info->var.yres << 1)) {
206 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys +
207 (info->fix.line_length *
208 (info->var.yres_virtual >> 1)));
209 } else {
210 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys);
211 }
212 }
213
214 words = info->fix.line_length / sizeof(u32);
215 if (!info->var.rotate || (info->var.rotate == 180)) {
216 words *= info->var.yres_virtual;
217 if (info->var.rotate /* 180 */) {
218 words -= (words % 8); /* should be divisable by 8 */
219 }
220 }
221 fbdev->regs->lcd_words = LCD_WRD_WRDS_N(words);
222
223 fbdev->regs->lcd_pwmdiv = 0;
224 fbdev->regs->lcd_pwmhi = 0;
225
226 /* Resume controller */
227 fbdev->regs->lcd_control |= LCD_CONTROL_GO;
228 mdelay(10);
229 au1100fb_fb_blank(VESA_NO_BLANKING, info);
230
231 return 0;
232 }
233
234 /* fb_setcolreg
235 * Set color in LCD palette.
236 */
au1100fb_fb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * fbi)237 int au1100fb_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi)
238 {
239 struct au1100fb_device *fbdev;
240 u32 *palette;
241 u32 value;
242
243 fbdev = to_au1100fb_device(fbi);
244 palette = fbdev->regs->lcd_palettebase;
245
246 if (regno > (AU1100_LCD_NBR_PALETTE_ENTRIES - 1))
247 return -EINVAL;
248
249 if (fbi->var.grayscale) {
250 /* Convert color to grayscale */
251 red = green = blue =
252 (19595 * red + 38470 * green + 7471 * blue) >> 16;
253 }
254
255 if (fbi->fix.visual == FB_VISUAL_TRUECOLOR) {
256 /* Place color in the pseudopalette */
257 if (regno > 16)
258 return -EINVAL;
259
260 palette = (u32*)fbi->pseudo_palette;
261
262 red >>= (16 - fbi->var.red.length);
263 green >>= (16 - fbi->var.green.length);
264 blue >>= (16 - fbi->var.blue.length);
265
266 value = (red << fbi->var.red.offset) |
267 (green << fbi->var.green.offset)|
268 (blue << fbi->var.blue.offset);
269 value &= 0xFFFF;
270
271 } else if (panel_is_active(fbdev->panel)) {
272 /* COLOR TFT PALLETTIZED (use RGB 565) */
273 value = (red & 0xF800)|((green >> 5) & 0x07E0)|((blue >> 11) & 0x001F);
274 value &= 0xFFFF;
275
276 } else if (panel_is_color(fbdev->panel)) {
277 /* COLOR STN MODE */
278 value = (((panel_swap_rgb(fbdev->panel) ? blue : red) >> 12) & 0x000F) |
279 ((green >> 8) & 0x00F0) |
280 (((panel_swap_rgb(fbdev->panel) ? red : blue) >> 4) & 0x0F00);
281 value &= 0xFFF;
282 } else {
283 /* MONOCHROME MODE */
284 value = (green >> 12) & 0x000F;
285 value &= 0xF;
286 }
287
288 palette[regno] = value;
289
290 return 0;
291 }
292
293 /* fb_pan_display
294 * Pan display in x and/or y as specified
295 */
au1100fb_fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * fbi)296 int au1100fb_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
297 {
298 struct au1100fb_device *fbdev;
299 int dy;
300
301 fbdev = to_au1100fb_device(fbi);
302
303 print_dbg("fb_pan_display %p %p", var, fbi);
304
305 if (!var || !fbdev) {
306 return -EINVAL;
307 }
308
309 if (var->xoffset - fbi->var.xoffset) {
310 /* No support for X panning for now! */
311 return -EINVAL;
312 }
313
314 print_dbg("fb_pan_display 2 %p %p", var, fbi);
315 dy = var->yoffset - fbi->var.yoffset;
316 if (dy) {
317
318 u32 dmaaddr;
319
320 print_dbg("Panning screen of %d lines", dy);
321
322 dmaaddr = fbdev->regs->lcd_dmaaddr0;
323 dmaaddr += (fbi->fix.line_length * dy);
324
325 /* TODO: Wait for current frame to finished */
326 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
327
328 if (panel_is_dual(fbdev->panel)) {
329 dmaaddr = fbdev->regs->lcd_dmaaddr1;
330 dmaaddr += (fbi->fix.line_length * dy);
331 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
332 }
333 }
334 print_dbg("fb_pan_display 3 %p %p", var, fbi);
335
336 return 0;
337 }
338
339 /* fb_mmap
340 * Map video memory in user space. We don't use the generic fb_mmap method mainly
341 * to allow the use of the TLB streaming flag (CCA=6)
342 */
au1100fb_fb_mmap(struct fb_info * fbi,struct vm_area_struct * vma)343 int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
344 {
345 struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
346
347 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
348
349 pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6
350
351 return dma_mmap_coherent(fbdev->dev, vma, fbdev->fb_mem, fbdev->fb_phys,
352 fbdev->fb_len);
353 }
354
355 static const struct fb_ops au1100fb_ops = {
356 .owner = THIS_MODULE,
357 __FB_DEFAULT_IOMEM_OPS_RDWR,
358 .fb_setcolreg = au1100fb_fb_setcolreg,
359 .fb_blank = au1100fb_fb_blank,
360 .fb_pan_display = au1100fb_fb_pan_display,
361 __FB_DEFAULT_IOMEM_OPS_DRAW,
362 .fb_mmap = au1100fb_fb_mmap,
363 };
364
365
366 /*-------------------------------------------------------------------------*/
367
au1100fb_setup(struct au1100fb_device * fbdev)368 static int au1100fb_setup(struct au1100fb_device *fbdev)
369 {
370 char *this_opt, *options;
371 int num_panels = ARRAY_SIZE(known_lcd_panels);
372
373 if (num_panels <= 0) {
374 print_err("No LCD panels supported by driver!");
375 return -ENODEV;
376 }
377
378 if (fb_get_options(DRIVER_NAME, &options))
379 return -ENODEV;
380 if (!options)
381 return -ENODEV;
382
383 while ((this_opt = strsep(&options, ",")) != NULL) {
384 /* Panel option */
385 if (!strncmp(this_opt, "panel:", 6)) {
386 int i;
387 this_opt += 6;
388 for (i = 0; i < num_panels; i++) {
389 if (!strncmp(this_opt, known_lcd_panels[i].name,
390 strlen(this_opt))) {
391 fbdev->panel = &known_lcd_panels[i];
392 fbdev->panel_idx = i;
393 break;
394 }
395 }
396 if (i >= num_panels) {
397 print_warn("Panel '%s' not supported!", this_opt);
398 return -ENODEV;
399 }
400 }
401 /* Unsupported option */
402 else
403 print_warn("Unsupported option \"%s\"", this_opt);
404 }
405
406 print_info("Panel=%s", fbdev->panel->name);
407
408 return 0;
409 }
410
au1100fb_drv_probe(struct platform_device * dev)411 static int au1100fb_drv_probe(struct platform_device *dev)
412 {
413 struct au1100fb_device *fbdev;
414 struct resource *regs_res;
415 struct clk *c;
416
417 /* Allocate new device private */
418 fbdev = devm_kzalloc(&dev->dev, sizeof(*fbdev), GFP_KERNEL);
419 if (!fbdev)
420 return -ENOMEM;
421
422 if (au1100fb_setup(fbdev))
423 goto failed;
424
425 platform_set_drvdata(dev, (void *)fbdev);
426 fbdev->dev = &dev->dev;
427
428 /* Allocate region for our registers and map them */
429 regs_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
430 if (!regs_res) {
431 print_err("fail to retrieve registers resource");
432 return -EFAULT;
433 }
434
435 au1100fb_fix.mmio_start = regs_res->start;
436 au1100fb_fix.mmio_len = resource_size(regs_res);
437
438 if (!devm_request_mem_region(&dev->dev,
439 au1100fb_fix.mmio_start,
440 au1100fb_fix.mmio_len,
441 DRIVER_NAME)) {
442 print_err("fail to lock memory region at 0x%08lx",
443 au1100fb_fix.mmio_start);
444 return -EBUSY;
445 }
446
447 fbdev->regs = (struct au1100fb_regs*)KSEG1ADDR(au1100fb_fix.mmio_start);
448
449 print_dbg("Register memory map at %p", fbdev->regs);
450 print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len);
451
452 c = clk_get(NULL, "lcd_intclk");
453 if (!IS_ERR(c)) {
454 fbdev->lcdclk = c;
455 clk_set_rate(c, 48000000);
456 clk_prepare_enable(c);
457 }
458
459 /* Allocate the framebuffer to the maximum screen size * nbr of video buffers */
460 fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres *
461 (fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS;
462
463 fbdev->fb_mem = dmam_alloc_coherent(&dev->dev,
464 PAGE_ALIGN(fbdev->fb_len),
465 &fbdev->fb_phys, GFP_KERNEL);
466 if (!fbdev->fb_mem) {
467 print_err("fail to allocate framebuffer (size: %dK))",
468 fbdev->fb_len / 1024);
469 return -ENOMEM;
470 }
471
472 au1100fb_fix.smem_start = fbdev->fb_phys;
473 au1100fb_fix.smem_len = fbdev->fb_len;
474
475 print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);
476 print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);
477
478 /* load the panel info into the var struct */
479 au1100fb_var.bits_per_pixel = fbdev->panel->bpp;
480 au1100fb_var.xres = fbdev->panel->xres;
481 au1100fb_var.xres_virtual = au1100fb_var.xres;
482 au1100fb_var.yres = fbdev->panel->yres;
483 au1100fb_var.yres_virtual = au1100fb_var.yres;
484
485 fbdev->info.screen_base = fbdev->fb_mem;
486 fbdev->info.fbops = &au1100fb_ops;
487 fbdev->info.fix = au1100fb_fix;
488
489 fbdev->info.pseudo_palette =
490 devm_kcalloc(&dev->dev, 16, sizeof(u32), GFP_KERNEL);
491 if (!fbdev->info.pseudo_palette)
492 return -ENOMEM;
493
494 if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
495 print_err("Fail to allocate colormap (%d entries)",
496 AU1100_LCD_NBR_PALETTE_ENTRIES);
497 return -EFAULT;
498 }
499
500 fbdev->info.var = au1100fb_var;
501
502 /* Set h/w registers */
503 au1100fb_setmode(fbdev);
504
505 /* Register new framebuffer */
506 if (register_framebuffer(&fbdev->info) < 0) {
507 print_err("cannot register new framebuffer");
508 goto failed;
509 }
510
511 return 0;
512
513 failed:
514 if (fbdev->lcdclk) {
515 clk_disable_unprepare(fbdev->lcdclk);
516 clk_put(fbdev->lcdclk);
517 }
518 if (fbdev->info.cmap.len != 0) {
519 fb_dealloc_cmap(&fbdev->info.cmap);
520 }
521
522 return -ENODEV;
523 }
524
au1100fb_drv_remove(struct platform_device * dev)525 void au1100fb_drv_remove(struct platform_device *dev)
526 {
527 struct au1100fb_device *fbdev = NULL;
528
529 fbdev = platform_get_drvdata(dev);
530
531 #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
532 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
533 #endif
534 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
535
536 /* Clean up all probe data */
537 unregister_framebuffer(&fbdev->info);
538
539 fb_dealloc_cmap(&fbdev->info.cmap);
540
541 if (fbdev->lcdclk) {
542 clk_disable_unprepare(fbdev->lcdclk);
543 clk_put(fbdev->lcdclk);
544 }
545 }
546
547 #ifdef CONFIG_PM
548 static struct au1100fb_regs fbregs;
549
au1100fb_drv_suspend(struct platform_device * dev,pm_message_t state)550 int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)
551 {
552 struct au1100fb_device *fbdev = platform_get_drvdata(dev);
553
554 if (!fbdev)
555 return 0;
556
557 /* Blank the LCD */
558 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
559
560 clk_disable(fbdev->lcdclk);
561
562 memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
563
564 return 0;
565 }
566
au1100fb_drv_resume(struct platform_device * dev)567 int au1100fb_drv_resume(struct platform_device *dev)
568 {
569 struct au1100fb_device *fbdev = platform_get_drvdata(dev);
570
571 if (!fbdev)
572 return 0;
573
574 memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
575
576 clk_enable(fbdev->lcdclk);
577
578 /* Unblank the LCD */
579 au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
580
581 return 0;
582 }
583 #else
584 #define au1100fb_drv_suspend NULL
585 #define au1100fb_drv_resume NULL
586 #endif
587
588 static struct platform_driver au1100fb_driver = {
589 .driver = {
590 .name = "au1100-lcd",
591 },
592 .probe = au1100fb_drv_probe,
593 .remove = au1100fb_drv_remove,
594 .suspend = au1100fb_drv_suspend,
595 .resume = au1100fb_drv_resume,
596 };
597 module_platform_driver(au1100fb_driver);
598
599 MODULE_DESCRIPTION(DRIVER_DESC);
600 MODULE_LICENSE("GPL");
601