[PARISC] stifb: Remove obsolete MODULE_PARM()
[linux-2.6] / drivers / video / 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/module.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/string.h>
17 #include <linux/slab.h>
18 #include <linux/delay.h>
19 #include <linux/mm.h>
20 #include <linux/fb.h>
21 #include <linux/init.h>
22 #include <linux/ioport.h>
23 #include <linux/list.h>
24 #include <linux/amba/bus.h>
25 #include <linux/amba/clcd.h>
26 #include <linux/clk.h>
27
28 #include <asm/sizes.h>
29
30 #define to_clcd(info)   container_of(info, struct clcd_fb, fb)
31
32 /* This is limited to 16 characters when displayed by X startup */
33 static const char *clcd_name = "CLCD FB";
34
35 /*
36  * Unfortunately, the enable/disable functions may be called either from
37  * process or IRQ context, and we _need_ to delay.  This is _not_ good.
38  */
39 static inline void clcdfb_sleep(unsigned int ms)
40 {
41         if (in_atomic()) {
42                 mdelay(ms);
43         } else {
44                 msleep(ms);
45         }
46 }
47
48 static inline void clcdfb_set_start(struct clcd_fb *fb)
49 {
50         unsigned long ustart = fb->fb.fix.smem_start;
51         unsigned long lstart;
52
53         ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
54         lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;
55
56         writel(ustart, fb->regs + CLCD_UBAS);
57         writel(lstart, fb->regs + CLCD_LBAS);
58 }
59
60 static void clcdfb_disable(struct clcd_fb *fb)
61 {
62         u32 val;
63
64         if (fb->board->disable)
65                 fb->board->disable(fb);
66
67         val = readl(fb->regs + CLCD_CNTL);
68         if (val & CNTL_LCDPWR) {
69                 val &= ~CNTL_LCDPWR;
70                 writel(val, fb->regs + CLCD_CNTL);
71
72                 clcdfb_sleep(20);
73         }
74         if (val & CNTL_LCDEN) {
75                 val &= ~CNTL_LCDEN;
76                 writel(val, fb->regs + CLCD_CNTL);
77         }
78
79         /*
80          * Disable CLCD clock source.
81          */
82         clk_disable(fb->clk);
83 }
84
85 static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
86 {
87         /*
88          * Enable the CLCD clock source.
89          */
90         clk_enable(fb->clk);
91
92         /*
93          * Bring up by first enabling..
94          */
95         cntl |= CNTL_LCDEN;
96         writel(cntl, fb->regs + CLCD_CNTL);
97
98         clcdfb_sleep(20);
99
100         /*
101          * and now apply power.
102          */
103         cntl |= CNTL_LCDPWR;
104         writel(cntl, fb->regs + CLCD_CNTL);
105
106         /*
107          * finally, enable the interface.
108          */
109         if (fb->board->enable)
110                 fb->board->enable(fb);
111 }
112
113 static int
114 clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
115 {
116         int ret = 0;
117
118         memset(&var->transp, 0, sizeof(var->transp));
119         memset(&var->red, 0, sizeof(var->red));
120         memset(&var->green, 0, sizeof(var->green));
121         memset(&var->blue, 0, sizeof(var->blue));
122
123         switch (var->bits_per_pixel) {
124         case 1:
125         case 2:
126         case 4:
127         case 8:
128                 var->red.length         = var->bits_per_pixel;
129                 var->red.offset         = 0;
130                 var->green.length       = var->bits_per_pixel;
131                 var->green.offset       = 0;
132                 var->blue.length        = var->bits_per_pixel;
133                 var->blue.offset        = 0;
134                 break;
135         case 16:
136                 var->red.length         = 5;
137                 var->green.length       = 6;
138                 var->blue.length        = 5;
139                 if (fb->panel->cntl & CNTL_BGR) {
140                         var->red.offset         = 11;
141                         var->green.offset       = 5;
142                         var->blue.offset        = 0;
143                 } else {
144                         var->red.offset         = 0;
145                         var->green.offset       = 5;
146                         var->blue.offset        = 11;
147                 }
148                 break;
149         case 32:
150                 if (fb->panel->cntl & CNTL_LCDTFT) {
151                         var->red.length         = 8;
152                         var->green.length       = 8;
153                         var->blue.length        = 8;
154
155                         if (fb->panel->cntl & CNTL_BGR) {
156                                 var->red.offset         = 16;
157                                 var->green.offset       = 8;
158                                 var->blue.offset        = 0;
159                         } else {
160                                 var->red.offset         = 0;
161                                 var->green.offset       = 8;
162                                 var->blue.offset        = 16;
163                         }
164                         break;
165                 }
166         default:
167                 ret = -EINVAL;
168                 break;
169         }
170
171         return ret;
172 }
173
174 static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
175 {
176         struct clcd_fb *fb = to_clcd(info);
177         int ret = -EINVAL;
178
179         if (fb->board->check)
180                 ret = fb->board->check(fb, var);
181
182         if (ret == 0 &&
183             var->xres_virtual * var->bits_per_pixel / 8 *
184             var->yres_virtual > fb->fb.fix.smem_len)
185                 ret = -EINVAL;
186
187         if (ret == 0)
188                 ret = clcdfb_set_bitfields(fb, var);
189
190         return ret;
191 }
192
193 static int clcdfb_set_par(struct fb_info *info)
194 {
195         struct clcd_fb *fb = to_clcd(info);
196         struct clcd_regs regs;
197
198         fb->fb.fix.line_length = fb->fb.var.xres_virtual *
199                                  fb->fb.var.bits_per_pixel / 8;
200
201         if (fb->fb.var.bits_per_pixel <= 8)
202                 fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
203         else
204                 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
205
206         fb->board->decode(fb, &regs);
207
208         clcdfb_disable(fb);
209
210         writel(regs.tim0, fb->regs + CLCD_TIM0);
211         writel(regs.tim1, fb->regs + CLCD_TIM1);
212         writel(regs.tim2, fb->regs + CLCD_TIM2);
213         writel(regs.tim3, fb->regs + CLCD_TIM3);
214
215         clcdfb_set_start(fb);
216
217         clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
218
219         fb->clcd_cntl = regs.cntl;
220
221         clcdfb_enable(fb, regs.cntl);
222
223 #ifdef DEBUG
224         printk(KERN_INFO "CLCD: Registers set to\n"
225                KERN_INFO "  %08x %08x %08x %08x\n"
226                KERN_INFO "  %08x %08x %08x %08x\n",
227                 readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
228                 readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
229                 readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
230                 readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL));
231 #endif
232
233         return 0;
234 }
235
236 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
237 {
238         unsigned int mask = (1 << bf->length) - 1;
239
240         return (val >> (16 - bf->length) & mask) << bf->offset;
241 }
242
243 /*
244  *  Set a single color register. The values supplied have a 16 bit
245  *  magnitude.  Return != 0 for invalid regno.
246  */
247 static int
248 clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
249                  unsigned int blue, unsigned int transp, struct fb_info *info)
250 {
251         struct clcd_fb *fb = to_clcd(info);
252
253         if (regno < 16)
254                 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
255                                   convert_bitfield(blue, &fb->fb.var.blue) |
256                                   convert_bitfield(green, &fb->fb.var.green) |
257                                   convert_bitfield(red, &fb->fb.var.red);
258
259         if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
260                 int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
261                 u32 val, mask, newval;
262
263                 newval  = (red >> 11)  & 0x001f;
264                 newval |= (green >> 6) & 0x03e0;
265                 newval |= (blue >> 1)  & 0x7c00;
266
267                 /*
268                  * 3.2.11: if we're configured for big endian
269                  * byte order, the palette entries are swapped.
270                  */
271                 if (fb->clcd_cntl & CNTL_BEBO)
272                         regno ^= 1;
273
274                 if (regno & 1) {
275                         newval <<= 16;
276                         mask = 0x0000ffff;
277                 } else {
278                         mask = 0xffff0000;
279                 }
280
281                 val = readl(fb->regs + hw_reg) & mask;
282                 writel(val | newval, fb->regs + hw_reg);
283         }
284
285         return regno > 255;
286 }
287
288 /*
289  *  Blank the screen if blank_mode != 0, else unblank. If blank == NULL
290  *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
291  *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
292  *  to e.g. a video mode which doesn't support it. Implements VESA suspend
293  *  and powerdown modes on hardware that supports disabling hsync/vsync:
294  *    blank_mode == 2: suspend vsync
295  *    blank_mode == 3: suspend hsync
296  *    blank_mode == 4: powerdown
297  */
298 static int clcdfb_blank(int blank_mode, struct fb_info *info)
299 {
300         struct clcd_fb *fb = to_clcd(info);
301
302         if (blank_mode != 0) {
303                 clcdfb_disable(fb);
304         } else {
305                 clcdfb_enable(fb, fb->clcd_cntl);
306         }
307         return 0;
308 }
309
310 static int clcdfb_mmap(struct fb_info *info, struct file *file,
311                        struct vm_area_struct *vma)
312 {
313         struct clcd_fb *fb = to_clcd(info);
314         unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
315         int ret = -EINVAL;
316
317         len = info->fix.smem_len;
318
319         if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
320             fb->board->mmap)
321                 ret = fb->board->mmap(fb, vma);
322
323         return ret;
324 }
325
326 static struct fb_ops clcdfb_ops = {
327         .owner          = THIS_MODULE,
328         .fb_check_var   = clcdfb_check_var,
329         .fb_set_par     = clcdfb_set_par,
330         .fb_setcolreg   = clcdfb_setcolreg,
331         .fb_blank       = clcdfb_blank,
332         .fb_fillrect    = cfb_fillrect,
333         .fb_copyarea    = cfb_copyarea,
334         .fb_imageblit   = cfb_imageblit,
335         .fb_mmap        = clcdfb_mmap,
336 };
337
338 static int clcdfb_register(struct clcd_fb *fb)
339 {
340         int ret;
341
342         fb->clk = clk_get(&fb->dev->dev, "CLCDCLK");
343         if (IS_ERR(fb->clk)) {
344                 ret = PTR_ERR(fb->clk);
345                 goto out;
346         }
347
348         fb->fb.fix.mmio_start   = fb->dev->res.start;
349         fb->fb.fix.mmio_len     = SZ_4K;
350
351         fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
352         if (!fb->regs) {
353                 printk(KERN_ERR "CLCD: unable to remap registers\n");
354                 ret = -ENOMEM;
355                 goto free_clk;
356         }
357
358         fb->fb.fbops            = &clcdfb_ops;
359         fb->fb.flags            = FBINFO_FLAG_DEFAULT;
360         fb->fb.pseudo_palette   = fb->cmap;
361
362         strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
363         fb->fb.fix.type         = FB_TYPE_PACKED_PIXELS;
364         fb->fb.fix.type_aux     = 0;
365         fb->fb.fix.xpanstep     = 0;
366         fb->fb.fix.ypanstep     = 0;
367         fb->fb.fix.ywrapstep    = 0;
368         fb->fb.fix.accel        = FB_ACCEL_NONE;
369
370         fb->fb.var.xres         = fb->panel->mode.xres;
371         fb->fb.var.yres         = fb->panel->mode.yres;
372         fb->fb.var.xres_virtual = fb->panel->mode.xres;
373         fb->fb.var.yres_virtual = fb->panel->mode.yres;
374         fb->fb.var.bits_per_pixel = fb->panel->bpp;
375         fb->fb.var.grayscale    = fb->panel->grayscale;
376         fb->fb.var.pixclock     = fb->panel->mode.pixclock;
377         fb->fb.var.left_margin  = fb->panel->mode.left_margin;
378         fb->fb.var.right_margin = fb->panel->mode.right_margin;
379         fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
380         fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
381         fb->fb.var.hsync_len    = fb->panel->mode.hsync_len;
382         fb->fb.var.vsync_len    = fb->panel->mode.vsync_len;
383         fb->fb.var.sync         = fb->panel->mode.sync;
384         fb->fb.var.vmode        = fb->panel->mode.vmode;
385         fb->fb.var.activate     = FB_ACTIVATE_NOW;
386         fb->fb.var.nonstd       = 0;
387         fb->fb.var.height       = fb->panel->height;
388         fb->fb.var.width        = fb->panel->width;
389         fb->fb.var.accel_flags  = 0;
390
391         fb->fb.monspecs.hfmin   = 0;
392         fb->fb.monspecs.hfmax   = 100000;
393         fb->fb.monspecs.vfmin   = 0;
394         fb->fb.monspecs.vfmax   = 400;
395         fb->fb.monspecs.dclkmin = 1000000;
396         fb->fb.monspecs.dclkmax = 100000000;
397
398         /*
399          * Make sure that the bitfields are set appropriately.
400          */
401         clcdfb_set_bitfields(fb, &fb->fb.var);
402
403         /*
404          * Allocate colourmap.
405          */
406         fb_alloc_cmap(&fb->fb.cmap, 256, 0);
407
408         /*
409          * Ensure interrupts are disabled.
410          */
411         writel(0, fb->regs + CLCD_IENB);
412
413         fb_set_var(&fb->fb, &fb->fb.var);
414
415         printk(KERN_INFO "CLCD: %s hardware, %s display\n",
416                fb->board->name, fb->panel->mode.name);
417
418         ret = register_framebuffer(&fb->fb);
419         if (ret == 0)
420                 goto out;
421
422         printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
423
424         iounmap(fb->regs);
425  free_clk:
426         clk_put(fb->clk);
427  out:
428         return ret;
429 }
430
431 static int clcdfb_probe(struct amba_device *dev, void *id)
432 {
433         struct clcd_board *board = dev->dev.platform_data;
434         struct clcd_fb *fb;
435         int ret;
436
437         if (!board)
438                 return -EINVAL;
439
440         ret = amba_request_regions(dev, NULL);
441         if (ret) {
442                 printk(KERN_ERR "CLCD: unable to reserve regs region\n");
443                 goto out;
444         }
445
446         fb = (struct clcd_fb *) kmalloc(sizeof(struct clcd_fb), GFP_KERNEL);
447         if (!fb) {
448                 printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
449                 ret = -ENOMEM;
450                 goto free_region;
451         }
452         memset(fb, 0, sizeof(struct clcd_fb));
453
454         fb->dev = dev;
455         fb->board = board;
456
457         ret = fb->board->setup(fb);
458         if (ret)
459                 goto free_fb;
460
461         ret = clcdfb_register(fb); 
462         if (ret == 0) {
463                 amba_set_drvdata(dev, fb);
464                 goto out;
465         }
466
467         fb->board->remove(fb);
468  free_fb:
469         kfree(fb);
470  free_region:
471         amba_release_regions(dev);
472  out:
473         return ret;
474 }
475
476 static int clcdfb_remove(struct amba_device *dev)
477 {
478         struct clcd_fb *fb = amba_get_drvdata(dev);
479
480         amba_set_drvdata(dev, NULL);
481
482         clcdfb_disable(fb);
483         unregister_framebuffer(&fb->fb);
484         iounmap(fb->regs);
485         clk_put(fb->clk);
486
487         fb->board->remove(fb);
488
489         kfree(fb);
490
491         amba_release_regions(dev);
492
493         return 0;
494 }
495
496 static struct amba_id clcdfb_id_table[] = {
497         {
498                 .id     = 0x00041110,
499                 .mask   = 0x000ffffe,
500         },
501         { 0, 0 },
502 };
503
504 static struct amba_driver clcd_driver = {
505         .drv            = {
506                 .name   = "clcd-pl11x",
507         },
508         .probe          = clcdfb_probe,
509         .remove         = clcdfb_remove,
510         .id_table       = clcdfb_id_table,
511 };
512
513 static int __init amba_clcdfb_init(void)
514 {
515         if (fb_get_options("ambafb", NULL))
516                 return -ENODEV;
517
518         return amba_driver_register(&clcd_driver);
519 }
520
521 module_init(amba_clcdfb_init);
522
523 static void __exit amba_clcdfb_exit(void)
524 {
525         amba_driver_unregister(&clcd_driver);
526 }
527
528 module_exit(amba_clcdfb_exit);
529
530 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
531 MODULE_LICENSE("GPL");