[PATCH] DRIVER MODEL: Get rid of the obsolete tri-level suspend/resume callbacks
[linux-2.6.git] / drivers / video / sa1100fb.c
1 /*
2  *  linux/drivers/video/sa1100fb.c
3  *
4  *  Copyright (C) 1999 Eric A. Thomas
5  *   Based on acornfb.c Copyright (C) Russell King.
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 for
9  * more details.
10  *
11  *              StrongARM 1100 LCD Controller Frame Buffer Driver
12  *
13  * Please direct your questions and comments on this driver to the following
14  * email address:
15  *
16  *      linux-arm-kernel@lists.arm.linux.org.uk
17  *
18  * Clean patches should be sent to the ARM Linux Patch System.  Please see the
19  * following web page for more information:
20  *
21  *      http://www.arm.linux.org.uk/developer/patches/info.shtml
22  *
23  * Thank you.
24  *
25  * Known problems:
26  *      - With the Neponset plugged into an Assabet, LCD powerdown
27  *        doesn't work (LCD stays powered up).  Therefore we shouldn't
28  *        blank the screen.
29  *      - We don't limit the CPU clock rate nor the mode selection
30  *        according to the available SDRAM bandwidth.
31  *
32  * Other notes:
33  *      - Linear grayscale palettes and the kernel.
34  *        Such code does not belong in the kernel.  The kernel frame buffer
35  *        drivers do not expect a linear colourmap, but a colourmap based on
36  *        the VT100 standard mapping.
37  *
38  *        If your _userspace_ requires a linear colourmap, then the setup of
39  *        such a colourmap belongs _in userspace_, not in the kernel.  Code
40  *        to set the colourmap correctly from user space has been sent to
41  *        David Neuer.  It's around 8 lines of C code, plus another 4 to
42  *        detect if we are using grayscale.
43  *
44  *      - The following must never be specified in a panel definition:
45  *           LCCR0_LtlEnd, LCCR3_PixClkDiv, LCCR3_VrtSnchL, LCCR3_HorSnchL
46  *
47  *      - The following should be specified:
48  *           either LCCR0_Color or LCCR0_Mono
49  *           either LCCR0_Sngl or LCCR0_Dual
50  *           either LCCR0_Act or LCCR0_Pas
51  *           either LCCR3_OutEnH or LCCD3_OutEnL
52  *           either LCCR3_PixRsEdg or LCCR3_PixFlEdg
53  *           either LCCR3_ACBsDiv or LCCR3_ACBsCntOff
54  *
55  * Code Status:
56  * 1999/04/01:
57  *      - Driver appears to be working for Brutus 320x200x8bpp mode.  Other
58  *        resolutions are working, but only the 8bpp mode is supported.
59  *        Changes need to be made to the palette encode and decode routines
60  *        to support 4 and 16 bpp modes.  
61  *        Driver is not designed to be a module.  The FrameBuffer is statically
62  *        allocated since dynamic allocation of a 300k buffer cannot be 
63  *        guaranteed. 
64  *
65  * 1999/06/17:
66  *      - FrameBuffer memory is now allocated at run-time when the
67  *        driver is initialized.    
68  *
69  * 2000/04/10: Nicolas Pitre <nico@cam.org>
70  *      - Big cleanup for dynamic selection of machine type at run time.
71  *
72  * 2000/07/19: Jamey Hicks <jamey@crl.dec.com>
73  *      - Support for Bitsy aka Compaq iPAQ H3600 added.
74  *
75  * 2000/08/07: Tak-Shing Chan <tchan.rd@idthk.com>
76  *             Jeff Sutherland <jsutherland@accelent.com>
77  *      - Resolved an issue caused by a change made to the Assabet's PLD 
78  *        earlier this year which broke the framebuffer driver for newer 
79  *        Phase 4 Assabets.  Some other parameters were changed to optimize
80  *        for the Sharp display.
81  *
82  * 2000/08/09: Kunihiko IMAI <imai@vasara.co.jp>
83  *      - XP860 support added
84  *
85  * 2000/08/19: Mark Huang <mhuang@livetoy.com>
86  *      - Allows standard options to be passed on the kernel command line
87  *        for most common passive displays.
88  *
89  * 2000/08/29:
90  *      - s/save_flags_cli/local_irq_save/
91  *      - remove unneeded extra save_flags_cli in sa1100fb_enable_lcd_controller
92  *
93  * 2000/10/10: Erik Mouw <J.A.K.Mouw@its.tudelft.nl>
94  *      - Updated LART stuff. Fixed some minor bugs.
95  *
96  * 2000/10/30: Murphy Chen <murphy@mail.dialogue.com.tw>
97  *      - Pangolin support added
98  *
99  * 2000/10/31: Roman Jordan <jor@hoeft-wessel.de>
100  *      - Huw Webpanel support added
101  *
102  * 2000/11/23: Eric Peng <ericpeng@coventive.com>
103  *      - Freebird add
104  *
105  * 2001/02/07: Jamey Hicks <jamey.hicks@compaq.com> 
106  *             Cliff Brake <cbrake@accelent.com>
107  *      - Added PM callback
108  *
109  * 2001/05/26: <rmk@arm.linux.org.uk>
110  *      - Fix 16bpp so that (a) we use the right colours rather than some
111  *        totally random colour depending on what was in page 0, and (b)
112  *        we don't de-reference a NULL pointer.
113  *      - remove duplicated implementation of consistent_alloc()
114  *      - convert dma address types to dma_addr_t
115  *      - remove unused 'montype' stuff
116  *      - remove redundant zero inits of init_var after the initial
117  *        memzero.
118  *      - remove allow_modeset (acornfb idea does not belong here)
119  *
120  * 2001/05/28: <rmk@arm.linux.org.uk>
121  *      - massive cleanup - move machine dependent data into structures
122  *      - I've left various #warnings in - if you see one, and know
123  *        the hardware concerned, please get in contact with me.
124  *
125  * 2001/05/31: <rmk@arm.linux.org.uk>
126  *      - Fix LCCR1 HSW value, fix all machine type specifications to
127  *        keep values in line.  (Please check your machine type specs)
128  *
129  * 2001/06/10: <rmk@arm.linux.org.uk>
130  *      - Fiddle with the LCD controller from task context only; mainly
131  *        so that we can run with interrupts on, and sleep.
132  *      - Convert #warnings into #errors.  No pain, no gain. ;)
133  *
134  * 2001/06/14: <rmk@arm.linux.org.uk>
135  *      - Make the palette BPS value for 12bpp come out correctly.
136  *      - Take notice of "greyscale" on any colour depth.
137  *      - Make truecolor visuals use the RGB channel encoding information.
138  *
139  * 2001/07/02: <rmk@arm.linux.org.uk>
140  *      - Fix colourmap problems.
141  *
142  * 2001/07/13: <abraham@2d3d.co.za>
143  *      - Added support for the ICP LCD-Kit01 on LART. This LCD is
144  *        manufactured by Prime View, model no V16C6448AB
145  *
146  * 2001/07/23: <rmk@arm.linux.org.uk>
147  *      - Hand merge version from handhelds.org CVS tree.  See patch
148  *        notes for 595/1 for more information.
149  *      - Drop 12bpp (it's 16bpp with different colour register mappings).
150  *      - This hardware can not do direct colour.  Therefore we don't
151  *        support it.
152  *
153  * 2001/07/27: <rmk@arm.linux.org.uk>
154  *      - Halve YRES on dual scan LCDs.
155  *
156  * 2001/08/22: <rmk@arm.linux.org.uk>
157  *      - Add b/w iPAQ pixclock value.
158  *
159  * 2001/10/12: <rmk@arm.linux.org.uk>
160  *      - Add patch 681/1 and clean up stork definitions.
161  */
162
163 #include <linux/config.h>
164 #include <linux/module.h>
165 #include <linux/kernel.h>
166 #include <linux/sched.h>
167 #include <linux/errno.h>
168 #include <linux/string.h>
169 #include <linux/interrupt.h>
170 #include <linux/slab.h>
171 #include <linux/fb.h>
172 #include <linux/delay.h>
173 #include <linux/init.h>
174 #include <linux/ioport.h>
175 #include <linux/cpufreq.h>
176 #include <linux/device.h>
177 #include <linux/dma-mapping.h>
178
179 #include <asm/hardware.h>
180 #include <asm/io.h>
181 #include <asm/irq.h>
182 #include <asm/mach-types.h>
183 #include <asm/uaccess.h>
184 #include <asm/arch/assabet.h>
185 #include <asm/arch/shannon.h>
186
187 /*
188  * debugging?
189  */
190 #define DEBUG 0
191 /*
192  * Complain if VAR is out of range.
193  */
194 #define DEBUG_VAR 1
195
196 #undef ASSABET_PAL_VIDEO
197
198 #include "sa1100fb.h"
199
200 extern void (*sa1100fb_backlight_power)(int on);
201 extern void (*sa1100fb_lcd_power)(int on);
202
203 /*
204  * IMHO this looks wrong.  In 8BPP, length should be 8.
205  */
206 static struct sa1100fb_rgb rgb_8 = {
207         .red    = { .offset = 0,  .length = 4, },
208         .green  = { .offset = 0,  .length = 4, },
209         .blue   = { .offset = 0,  .length = 4, },
210         .transp = { .offset = 0,  .length = 0, },
211 };
212
213 static struct sa1100fb_rgb def_rgb_16 = {
214         .red    = { .offset = 11, .length = 5, },
215         .green  = { .offset = 5,  .length = 6, },
216         .blue   = { .offset = 0,  .length = 5, },
217         .transp = { .offset = 0,  .length = 0, },
218 };
219
220 #ifdef CONFIG_SA1100_ASSABET
221 #ifndef ASSABET_PAL_VIDEO
222 /*
223  * The assabet uses a sharp LQ039Q2DS54 LCD module.  It is actually
224  * takes an RGB666 signal, but we provide it with an RGB565 signal
225  * instead (def_rgb_16).
226  */
227 static struct sa1100fb_mach_info lq039q2ds54_info __initdata = {
228         .pixclock       = 171521,       .bpp            = 16,
229         .xres           = 320,          .yres           = 240,
230
231         .hsync_len      = 5,            .vsync_len      = 1,
232         .left_margin    = 61,           .upper_margin   = 3,
233         .right_margin   = 9,            .lower_margin   = 0,
234
235         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
236
237         .lccr0          = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
238         .lccr3          = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
239 };
240 #else
241 static struct sa1100fb_mach_info pal_info __initdata = {
242         .pixclock       = 67797,        .bpp            = 16,
243         .xres           = 640,          .yres           = 512,
244
245         .hsync_len      = 64,           .vsync_len      = 6,
246         .left_margin    = 125,          .upper_margin   = 70,
247         .right_margin   = 115,          .lower_margin   = 36,
248
249         .lccr0          = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
250         .lccr3          = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(512),
251 };
252 #endif
253 #endif
254
255 #ifdef CONFIG_SA1100_H3800
256 static struct sa1100fb_mach_info h3800_info __initdata = {
257         .pixclock       = 174757,       .bpp            = 16,
258         .xres           = 320,          .yres           = 240,
259
260         .hsync_len      = 3,            .vsync_len      = 3,
261         .left_margin    = 12,           .upper_margin   = 10,
262         .right_margin   = 17,           .lower_margin   = 1,
263
264         .cmap_static    = 1,
265
266         .lccr0          = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
267         .lccr3          = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
268 };
269 #endif
270
271 #ifdef CONFIG_SA1100_H3600
272 static struct sa1100fb_mach_info h3600_info __initdata = {
273         .pixclock       = 174757,       .bpp            = 16,
274         .xres           = 320,          .yres           = 240,
275
276         .hsync_len      = 3,            .vsync_len      = 3,
277         .left_margin    = 12,           .upper_margin   = 10,
278         .right_margin   = 17,           .lower_margin   = 1,
279
280         .cmap_static    = 1,
281
282         .lccr0          = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
283         .lccr3          = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
284 };
285
286 static struct sa1100fb_rgb h3600_rgb_16 = {
287         .red    = { .offset = 12, .length = 4, },
288         .green  = { .offset = 7,  .length = 4, },
289         .blue   = { .offset = 1,  .length = 4, },
290         .transp = { .offset = 0,  .length = 0, },
291 };
292 #endif
293
294 #ifdef CONFIG_SA1100_H3100
295 static struct sa1100fb_mach_info h3100_info __initdata = {
296         .pixclock       = 406977,       .bpp            = 4,
297         .xres           = 320,          .yres           = 240,
298
299         .hsync_len      = 26,           .vsync_len      = 41,
300         .left_margin    = 4,            .upper_margin   = 0,
301         .right_margin   = 4,            .lower_margin   = 0,
302
303         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
304         .cmap_greyscale = 1,
305         .cmap_inverse   = 1,
306
307         .lccr0          = LCCR0_Mono | LCCR0_4PixMono | LCCR0_Sngl | LCCR0_Pas,
308         .lccr3          = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
309 };
310 #endif
311
312 #ifdef CONFIG_SA1100_COLLIE
313 static struct sa1100fb_mach_info collie_info __initdata = {
314         .pixclock       = 171521,       .bpp            = 16,
315         .xres           = 320,          .yres           = 240,
316
317         .hsync_len      = 5,            .vsync_len      = 1,
318         .left_margin    = 11,           .upper_margin   = 2,
319         .right_margin   = 30,           .lower_margin   = 0,
320
321         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
322
323         .lccr0          = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
324         .lccr3          = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
325 };
326 #endif
327
328 #ifdef LART_GREY_LCD
329 static struct sa1100fb_mach_info lart_grey_info __initdata = {
330         .pixclock       = 150000,       .bpp            = 4,
331         .xres           = 320,          .yres           = 240,
332
333         .hsync_len      = 1,            .vsync_len      = 1,
334         .left_margin    = 4,            .upper_margin   = 0,
335         .right_margin   = 2,            .lower_margin   = 0,
336
337         .cmap_greyscale = 1,
338         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
339
340         .lccr0          = LCCR0_Mono | LCCR0_Sngl | LCCR0_Pas | LCCR0_4PixMono,
341         .lccr3          = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(512),
342 };
343 #endif
344 #ifdef LART_COLOR_LCD
345 static struct sa1100fb_mach_info lart_color_info __initdata = {
346         .pixclock       = 150000,       .bpp            = 16,
347         .xres           = 320,          .yres           = 240,
348
349         .hsync_len      = 2,            .vsync_len      = 3,
350         .left_margin    = 69,           .upper_margin   = 14,
351         .right_margin   = 8,            .lower_margin   = 4,
352
353         .lccr0          = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
354         .lccr3          = LCCR3_OutEnH | LCCR3_PixFlEdg | LCCR3_ACBsDiv(512),
355 };
356 #endif
357 #ifdef LART_VIDEO_OUT
358 static struct sa1100fb_mach_info lart_video_info __initdata = {
359         .pixclock       = 39721,        .bpp            = 16,
360         .xres           = 640,          .yres           = 480,
361
362         .hsync_len      = 95,           .vsync_len      = 2,
363         .left_margin    = 40,           .upper_margin   = 32,
364         .right_margin   = 24,           .lower_margin   = 11,
365
366         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
367
368         .lccr0          = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
369         .lccr3          = LCCR3_OutEnL | LCCR3_PixFlEdg | LCCR3_ACBsDiv(512),
370 };
371 #endif
372
373 #ifdef LART_KIT01_LCD
374 static struct sa1100fb_mach_info lart_kit01_info __initdata = {
375         .pixclock       = 63291,        .bpp            = 16,
376         .xres           = 640,          .yres           = 480,
377
378         .hsync_len      = 64,           .vsync_len      = 3,
379         .left_margin    = 122,          .upper_margin   = 45,
380         .right_margin   = 10,           .lower_margin   = 10,
381
382         .lccr0          = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
383         .lccr3          = LCCR3_OutEnH | LCCR3_PixFlEdg
384 };
385 #endif
386
387 #ifdef CONFIG_SA1100_SHANNON
388 static struct sa1100fb_mach_info shannon_info __initdata = {
389         .pixclock       = 152500,       .bpp            = 8,
390         .xres           = 640,          .yres           = 480,
391
392         .hsync_len      = 4,            .vsync_len      = 3,
393         .left_margin    = 2,            .upper_margin   = 0,
394         .right_margin   = 1,            .lower_margin   = 0,
395
396         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
397
398         .lccr0          = LCCR0_Color | LCCR0_Dual | LCCR0_Pas,
399         .lccr3          = LCCR3_ACBsDiv(512),
400 };
401 #endif
402
403
404
405 static struct sa1100fb_mach_info * __init
406 sa1100fb_get_machine_info(struct sa1100fb_info *fbi)
407 {
408         struct sa1100fb_mach_info *inf = NULL;
409
410         /*
411          *            R        G       B       T
412          * default  {11,5}, { 5,6}, { 0,5}, { 0,0}
413          * h3600    {12,4}, { 7,4}, { 1,4}, { 0,0}
414          * freebird { 8,4}, { 4,4}, { 0,4}, {12,4}
415          */
416 #ifdef CONFIG_SA1100_ASSABET
417         if (machine_is_assabet()) {
418 #ifndef ASSABET_PAL_VIDEO
419                 inf = &lq039q2ds54_info;
420 #else
421                 inf = &pal_info;
422 #endif
423         }
424 #endif
425 #ifdef CONFIG_SA1100_H3100
426         if (machine_is_h3100()) {
427                 inf = &h3100_info;
428         }
429 #endif
430 #ifdef CONFIG_SA1100_H3600
431         if (machine_is_h3600()) {
432                 inf = &h3600_info;
433                 fbi->rgb[RGB_16] = &h3600_rgb_16;
434         }
435 #endif
436 #ifdef CONFIG_SA1100_H3800
437         if (machine_is_h3800()) {
438                 inf = &h3800_info;
439         }
440 #endif
441 #ifdef CONFIG_SA1100_COLLIE
442         if (machine_is_collie()) {
443                 inf = &collie_info;
444         }
445 #endif
446 #ifdef CONFIG_SA1100_LART
447         if (machine_is_lart()) {
448 #ifdef LART_GREY_LCD
449                 inf = &lart_grey_info;
450 #endif
451 #ifdef LART_COLOR_LCD
452                 inf = &lart_color_info;
453 #endif
454 #ifdef LART_VIDEO_OUT
455                 inf = &lart_video_info;
456 #endif
457 #ifdef LART_KIT01_LCD
458                 inf = &lart_kit01_info;
459 #endif
460         }
461 #endif
462 #ifdef CONFIG_SA1100_SHANNON
463         if (machine_is_shannon()) {
464                 inf = &shannon_info;
465         }
466 #endif
467         return inf;
468 }
469
470 static int sa1100fb_activate_var(struct fb_var_screeninfo *var, struct sa1100fb_info *);
471 static void set_ctrlr_state(struct sa1100fb_info *fbi, u_int state);
472
473 static inline void sa1100fb_schedule_work(struct sa1100fb_info *fbi, u_int state)
474 {
475         unsigned long flags;
476
477         local_irq_save(flags);
478         /*
479          * We need to handle two requests being made at the same time.
480          * There are two important cases:
481          *  1. When we are changing VT (C_REENABLE) while unblanking (C_ENABLE)
482          *     We must perform the unblanking, which will do our REENABLE for us.
483          *  2. When we are blanking, but immediately unblank before we have
484          *     blanked.  We do the "REENABLE" thing here as well, just to be sure.
485          */
486         if (fbi->task_state == C_ENABLE && state == C_REENABLE)
487                 state = (u_int) -1;
488         if (fbi->task_state == C_DISABLE && state == C_ENABLE)
489                 state = C_REENABLE;
490
491         if (state != (u_int)-1) {
492                 fbi->task_state = state;
493                 schedule_work(&fbi->task);
494         }
495         local_irq_restore(flags);
496 }
497
498 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
499 {
500         chan &= 0xffff;
501         chan >>= 16 - bf->length;
502         return chan << bf->offset;
503 }
504
505 /*
506  * Convert bits-per-pixel to a hardware palette PBS value.
507  */
508 static inline u_int palette_pbs(struct fb_var_screeninfo *var)
509 {
510         int ret = 0;
511         switch (var->bits_per_pixel) {
512         case 4:  ret = 0 << 12; break;
513         case 8:  ret = 1 << 12; break;
514         case 16: ret = 2 << 12; break;
515         }
516         return ret;
517 }
518
519 static int
520 sa1100fb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
521                        u_int trans, struct fb_info *info)
522 {
523         struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
524         u_int val, ret = 1;
525
526         if (regno < fbi->palette_size) {
527                 val = ((red >> 4) & 0xf00);
528                 val |= ((green >> 8) & 0x0f0);
529                 val |= ((blue >> 12) & 0x00f);
530
531                 if (regno == 0)
532                         val |= palette_pbs(&fbi->fb.var);
533
534                 fbi->palette_cpu[regno] = val;
535                 ret = 0;
536         }
537         return ret;
538 }
539
540 static int
541 sa1100fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
542                    u_int trans, struct fb_info *info)
543 {
544         struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
545         unsigned int val;
546         int ret = 1;
547
548         /*
549          * If inverse mode was selected, invert all the colours
550          * rather than the register number.  The register number
551          * is what you poke into the framebuffer to produce the
552          * colour you requested.
553          */
554         if (fbi->cmap_inverse) {
555                 red   = 0xffff - red;
556                 green = 0xffff - green;
557                 blue  = 0xffff - blue;
558         }
559
560         /*
561          * If greyscale is true, then we convert the RGB value
562          * to greyscale no mater what visual we are using.
563          */
564         if (fbi->fb.var.grayscale)
565                 red = green = blue = (19595 * red + 38470 * green +
566                                         7471 * blue) >> 16;
567
568         switch (fbi->fb.fix.visual) {
569         case FB_VISUAL_TRUECOLOR:
570                 /*
571                  * 12 or 16-bit True Colour.  We encode the RGB value
572                  * according to the RGB bitfield information.
573                  */
574                 if (regno < 16) {
575                         u32 *pal = fbi->fb.pseudo_palette;
576
577                         val  = chan_to_field(red, &fbi->fb.var.red);
578                         val |= chan_to_field(green, &fbi->fb.var.green);
579                         val |= chan_to_field(blue, &fbi->fb.var.blue);
580
581                         pal[regno] = val;
582                         ret = 0;
583                 }
584                 break;
585
586         case FB_VISUAL_STATIC_PSEUDOCOLOR:
587         case FB_VISUAL_PSEUDOCOLOR:
588                 ret = sa1100fb_setpalettereg(regno, red, green, blue, trans, info);
589                 break;
590         }
591
592         return ret;
593 }
594
595 #ifdef CONFIG_CPU_FREQ
596 /*
597  *  sa1100fb_display_dma_period()
598  *    Calculate the minimum period (in picoseconds) between two DMA
599  *    requests for the LCD controller.  If we hit this, it means we're
600  *    doing nothing but LCD DMA.
601  */
602 static inline unsigned int sa1100fb_display_dma_period(struct fb_var_screeninfo *var)
603 {
604         /*
605          * Period = pixclock * bits_per_byte * bytes_per_transfer
606          *              / memory_bits_per_pixel;
607          */
608         return var->pixclock * 8 * 16 / var->bits_per_pixel;
609 }
610 #endif
611
612 /*
613  *  sa1100fb_check_var():
614  *    Round up in the following order: bits_per_pixel, xres,
615  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
616  *    bitfields, horizontal timing, vertical timing.
617  */
618 static int
619 sa1100fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
620 {
621         struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
622         int rgbidx;
623
624         if (var->xres < MIN_XRES)
625                 var->xres = MIN_XRES;
626         if (var->yres < MIN_YRES)
627                 var->yres = MIN_YRES;
628         if (var->xres > fbi->max_xres)
629                 var->xres = fbi->max_xres;
630         if (var->yres > fbi->max_yres)
631                 var->yres = fbi->max_yres;
632         var->xres_virtual = max(var->xres_virtual, var->xres);
633         var->yres_virtual = max(var->yres_virtual, var->yres);
634
635         DPRINTK("var->bits_per_pixel=%d\n", var->bits_per_pixel);
636         switch (var->bits_per_pixel) {
637         case 4:
638                 rgbidx = RGB_8;
639                 break;
640         case 8:
641                 rgbidx = RGB_8;
642                 break;
643         case 16:
644                 rgbidx = RGB_16;
645                 break;
646         default:
647                 return -EINVAL;
648         }
649
650         /*
651          * Copy the RGB parameters for this display
652          * from the machine specific parameters.
653          */
654         var->red    = fbi->rgb[rgbidx]->red;
655         var->green  = fbi->rgb[rgbidx]->green;
656         var->blue   = fbi->rgb[rgbidx]->blue;
657         var->transp = fbi->rgb[rgbidx]->transp;
658
659         DPRINTK("RGBT length = %d:%d:%d:%d\n",
660                 var->red.length, var->green.length, var->blue.length,
661                 var->transp.length);
662
663         DPRINTK("RGBT offset = %d:%d:%d:%d\n",
664                 var->red.offset, var->green.offset, var->blue.offset,
665                 var->transp.offset);
666
667 #ifdef CONFIG_CPU_FREQ
668         printk(KERN_DEBUG "dma period = %d ps, clock = %d kHz\n",
669                 sa1100fb_display_dma_period(var),
670                 cpufreq_get(smp_processor_id()));
671 #endif
672
673         return 0;
674 }
675
676 static inline void sa1100fb_set_truecolor(u_int is_true_color)
677 {
678         if (machine_is_assabet()) {
679 #if 1           // phase 4 or newer Assabet's
680                 if (is_true_color)
681                         ASSABET_BCR_set(ASSABET_BCR_LCD_12RGB);
682                 else
683                         ASSABET_BCR_clear(ASSABET_BCR_LCD_12RGB);
684 #else
685                 // older Assabet's
686                 if (is_true_color)
687                         ASSABET_BCR_clear(ASSABET_BCR_LCD_12RGB);
688                 else
689                         ASSABET_BCR_set(ASSABET_BCR_LCD_12RGB);
690 #endif
691         }
692 }
693
694 /*
695  * sa1100fb_set_par():
696  *      Set the user defined part of the display for the specified console
697  */
698 static int sa1100fb_set_par(struct fb_info *info)
699 {
700         struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
701         struct fb_var_screeninfo *var = &info->var;
702         unsigned long palette_mem_size;
703
704         DPRINTK("set_par\n");
705
706         if (var->bits_per_pixel == 16)
707                 fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR;
708         else if (!fbi->cmap_static)
709                 fbi->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
710         else {
711                 /*
712                  * Some people have weird ideas about wanting static
713                  * pseudocolor maps.  I suspect their user space
714                  * applications are broken.
715                  */
716                 fbi->fb.fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
717         }
718
719         fbi->fb.fix.line_length = var->xres_virtual *
720                                   var->bits_per_pixel / 8;
721         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
722
723         palette_mem_size = fbi->palette_size * sizeof(u16);
724
725         DPRINTK("palette_mem_size = 0x%08lx\n", (u_long) palette_mem_size);
726
727         fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
728         fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
729
730         /*
731          * Set (any) board control register to handle new color depth
732          */
733         sa1100fb_set_truecolor(fbi->fb.fix.visual == FB_VISUAL_TRUECOLOR);
734         sa1100fb_activate_var(var, fbi);
735
736         return 0;
737 }
738
739 #if 0
740 static int
741 sa1100fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
742                   struct fb_info *info)
743 {
744         struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
745
746         /*
747          * Make sure the user isn't doing something stupid.
748          */
749         if (!kspc && (fbi->fb.var.bits_per_pixel == 16 || fbi->cmap_static))
750                 return -EINVAL;
751
752         return gen_set_cmap(cmap, kspc, con, info);
753 }
754 #endif
755
756 /*
757  * Formal definition of the VESA spec:
758  *  On
759  *      This refers to the state of the display when it is in full operation
760  *  Stand-By
761  *      This defines an optional operating state of minimal power reduction with
762  *      the shortest recovery time
763  *  Suspend
764  *      This refers to a level of power management in which substantial power
765  *      reduction is achieved by the display.  The display can have a longer 
766  *      recovery time from this state than from the Stand-by state
767  *  Off
768  *      This indicates that the display is consuming the lowest level of power
769  *      and is non-operational. Recovery from this state may optionally require
770  *      the user to manually power on the monitor
771  *
772  *  Now, the fbdev driver adds an additional state, (blank), where they
773  *  turn off the video (maybe by colormap tricks), but don't mess with the
774  *  video itself: think of it semantically between on and Stand-By.
775  *
776  *  So here's what we should do in our fbdev blank routine:
777  *
778  *      VESA_NO_BLANKING (mode 0)       Video on,  front/back light on
779  *      VESA_VSYNC_SUSPEND (mode 1)     Video on,  front/back light off
780  *      VESA_HSYNC_SUSPEND (mode 2)     Video on,  front/back light off
781  *      VESA_POWERDOWN (mode 3)         Video off, front/back light off
782  *
783  *  This will match the matrox implementation.
784  */
785 /*
786  * sa1100fb_blank():
787  *      Blank the display by setting all palette values to zero.  Note, the 
788  *      12 and 16 bpp modes don't really use the palette, so this will not
789  *      blank the display in all modes.  
790  */
791 static int sa1100fb_blank(int blank, struct fb_info *info)
792 {
793         struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
794         int i;
795
796         DPRINTK("sa1100fb_blank: blank=%d\n", blank);
797
798         switch (blank) {
799         case FB_BLANK_POWERDOWN:
800         case FB_BLANK_VSYNC_SUSPEND:
801         case FB_BLANK_HSYNC_SUSPEND:
802         case FB_BLANK_NORMAL:
803                 if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
804                     fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
805                         for (i = 0; i < fbi->palette_size; i++)
806                                 sa1100fb_setpalettereg(i, 0, 0, 0, 0, info);
807                 sa1100fb_schedule_work(fbi, C_DISABLE);
808                 break;
809
810         case FB_BLANK_UNBLANK:
811                 if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
812                     fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
813                         fb_set_cmap(&fbi->fb.cmap, info);
814                 sa1100fb_schedule_work(fbi, C_ENABLE);
815         }
816         return 0;
817 }
818
819 static int sa1100fb_mmap(struct fb_info *info, struct file *file,
820                          struct vm_area_struct *vma)
821 {
822         struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
823         unsigned long start, len, off = vma->vm_pgoff << PAGE_SHIFT;
824
825         if (off < info->fix.smem_len) {
826                 vma->vm_pgoff += 1; /* skip over the palette */
827                 return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
828                                              fbi->map_dma, fbi->map_size);
829         }
830
831         start = info->fix.mmio_start;
832         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
833
834         if ((vma->vm_end - vma->vm_start + off) > len)
835                 return -EINVAL;
836
837         off += start & PAGE_MASK;
838         vma->vm_pgoff = off >> PAGE_SHIFT;
839         vma->vm_flags |= VM_IO;
840         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
841         return io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
842                                    vma->vm_end - vma->vm_start,
843                                    vma->vm_page_prot);
844 }
845
846 static struct fb_ops sa1100fb_ops = {
847         .owner          = THIS_MODULE,
848         .fb_check_var   = sa1100fb_check_var,
849         .fb_set_par     = sa1100fb_set_par,
850 //      .fb_set_cmap    = sa1100fb_set_cmap,
851         .fb_setcolreg   = sa1100fb_setcolreg,
852         .fb_fillrect    = cfb_fillrect,
853         .fb_copyarea    = cfb_copyarea,
854         .fb_imageblit   = cfb_imageblit,
855         .fb_blank       = sa1100fb_blank,
856         .fb_cursor      = soft_cursor,
857         .fb_mmap        = sa1100fb_mmap,
858 };
859
860 /*
861  * Calculate the PCD value from the clock rate (in picoseconds).
862  * We take account of the PPCR clock setting.
863  */
864 static inline unsigned int get_pcd(unsigned int pixclock, unsigned int cpuclock)
865 {
866         unsigned int pcd = cpuclock / 100;
867
868         pcd *= pixclock;
869         pcd /= 10000000;
870
871         return pcd + 1; /* make up for integer math truncations */
872 }
873
874 /*
875  * sa1100fb_activate_var():
876  *      Configures LCD Controller based on entries in var parameter.  Settings are      
877  *      only written to the controller if changes were made.  
878  */
879 static int sa1100fb_activate_var(struct fb_var_screeninfo *var, struct sa1100fb_info *fbi)
880 {
881         struct sa1100fb_lcd_reg new_regs;
882         u_int half_screen_size, yres, pcd;
883         u_long flags;
884
885         DPRINTK("Configuring SA1100 LCD\n");
886
887         DPRINTK("var: xres=%d hslen=%d lm=%d rm=%d\n",
888                 var->xres, var->hsync_len,
889                 var->left_margin, var->right_margin);
890         DPRINTK("var: yres=%d vslen=%d um=%d bm=%d\n",
891                 var->yres, var->vsync_len,
892                 var->upper_margin, var->lower_margin);
893
894 #if DEBUG_VAR
895         if (var->xres < 16        || var->xres > 1024)
896                 printk(KERN_ERR "%s: invalid xres %d\n",
897                         fbi->fb.fix.id, var->xres);
898         if (var->hsync_len < 1    || var->hsync_len > 64)
899                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
900                         fbi->fb.fix.id, var->hsync_len);
901         if (var->left_margin < 1  || var->left_margin > 255)
902                 printk(KERN_ERR "%s: invalid left_margin %d\n",
903                         fbi->fb.fix.id, var->left_margin);
904         if (var->right_margin < 1 || var->right_margin > 255)
905                 printk(KERN_ERR "%s: invalid right_margin %d\n",
906                         fbi->fb.fix.id, var->right_margin);
907         if (var->yres < 1         || var->yres > 1024)
908                 printk(KERN_ERR "%s: invalid yres %d\n",
909                         fbi->fb.fix.id, var->yres);
910         if (var->vsync_len < 1    || var->vsync_len > 64)
911                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
912                         fbi->fb.fix.id, var->vsync_len);
913         if (var->upper_margin < 0 || var->upper_margin > 255)
914                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
915                         fbi->fb.fix.id, var->upper_margin);
916         if (var->lower_margin < 0 || var->lower_margin > 255)
917                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
918                         fbi->fb.fix.id, var->lower_margin);
919 #endif
920
921         new_regs.lccr0 = fbi->lccr0 |
922                 LCCR0_LEN | LCCR0_LDM | LCCR0_BAM |
923                 LCCR0_ERM | LCCR0_LtlEnd | LCCR0_DMADel(0);
924
925         new_regs.lccr1 =
926                 LCCR1_DisWdth(var->xres) +
927                 LCCR1_HorSnchWdth(var->hsync_len) +
928                 LCCR1_BegLnDel(var->left_margin) +
929                 LCCR1_EndLnDel(var->right_margin);
930
931         /*
932          * If we have a dual scan LCD, then we need to halve
933          * the YRES parameter.
934          */
935         yres = var->yres;
936         if (fbi->lccr0 & LCCR0_Dual)
937                 yres /= 2;
938
939         new_regs.lccr2 =
940                 LCCR2_DisHght(yres) +
941                 LCCR2_VrtSnchWdth(var->vsync_len) +
942                 LCCR2_BegFrmDel(var->upper_margin) +
943                 LCCR2_EndFrmDel(var->lower_margin);
944
945         pcd = get_pcd(var->pixclock, cpufreq_get(0));
946         new_regs.lccr3 = LCCR3_PixClkDiv(pcd) | fbi->lccr3 |
947                 (var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) |
948                 (var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL);
949
950         DPRINTK("nlccr0 = 0x%08lx\n", new_regs.lccr0);
951         DPRINTK("nlccr1 = 0x%08lx\n", new_regs.lccr1);
952         DPRINTK("nlccr2 = 0x%08lx\n", new_regs.lccr2);
953         DPRINTK("nlccr3 = 0x%08lx\n", new_regs.lccr3);
954
955         half_screen_size = var->bits_per_pixel;
956         half_screen_size = half_screen_size * var->xres * var->yres / 16;
957
958         /* Update shadow copy atomically */
959         local_irq_save(flags);
960         fbi->dbar1 = fbi->palette_dma;
961         fbi->dbar2 = fbi->screen_dma + half_screen_size;
962
963         fbi->reg_lccr0 = new_regs.lccr0;
964         fbi->reg_lccr1 = new_regs.lccr1;
965         fbi->reg_lccr2 = new_regs.lccr2;
966         fbi->reg_lccr3 = new_regs.lccr3;
967         local_irq_restore(flags);
968
969         /*
970          * Only update the registers if the controller is enabled
971          * and something has changed.
972          */
973         if ((LCCR0 != fbi->reg_lccr0)       || (LCCR1 != fbi->reg_lccr1) ||
974             (LCCR2 != fbi->reg_lccr2)       || (LCCR3 != fbi->reg_lccr3) ||
975             (DBAR1 != fbi->dbar1) || (DBAR2 != fbi->dbar2))
976                 sa1100fb_schedule_work(fbi, C_REENABLE);
977
978         return 0;
979 }
980
981 /*
982  * NOTE!  The following functions are purely helpers for set_ctrlr_state.
983  * Do not call them directly; set_ctrlr_state does the correct serialisation
984  * to ensure that things happen in the right way 100% of time time.
985  *      -- rmk
986  */
987 static inline void __sa1100fb_backlight_power(struct sa1100fb_info *fbi, int on)
988 {
989         DPRINTK("backlight o%s\n", on ? "n" : "ff");
990
991         if (sa1100fb_backlight_power)
992                 sa1100fb_backlight_power(on);
993 }
994
995 static inline void __sa1100fb_lcd_power(struct sa1100fb_info *fbi, int on)
996 {
997         DPRINTK("LCD power o%s\n", on ? "n" : "ff");
998
999         if (sa1100fb_lcd_power)
1000                 sa1100fb_lcd_power(on);
1001 }
1002
1003 static void sa1100fb_setup_gpio(struct sa1100fb_info *fbi)
1004 {
1005         u_int mask = 0;
1006
1007         /*
1008          * Enable GPIO<9:2> for LCD use if:
1009          *  1. Active display, or
1010          *  2. Color Dual Passive display
1011          *
1012          * see table 11.8 on page 11-27 in the SA1100 manual
1013          *   -- Erik.
1014          *
1015          * SA1110 spec update nr. 25 says we can and should
1016          * clear LDD15 to 12 for 4 or 8bpp modes with active
1017          * panels.  
1018          */
1019         if ((fbi->reg_lccr0 & LCCR0_CMS) == LCCR0_Color &&
1020             (fbi->reg_lccr0 & (LCCR0_Dual|LCCR0_Act)) != 0) {
1021                 mask = GPIO_LDD11 | GPIO_LDD10 | GPIO_LDD9  | GPIO_LDD8;
1022
1023                 if (fbi->fb.var.bits_per_pixel > 8 ||
1024                     (fbi->reg_lccr0 & (LCCR0_Dual|LCCR0_Act)) == LCCR0_Dual)
1025                         mask |= GPIO_LDD15 | GPIO_LDD14 | GPIO_LDD13 | GPIO_LDD12;
1026
1027         }
1028
1029         if (mask) {
1030                 GPDR |= mask;
1031                 GAFR |= mask;
1032         }
1033 }
1034
1035 static void sa1100fb_enable_controller(struct sa1100fb_info *fbi)
1036 {
1037         DPRINTK("Enabling LCD controller\n");
1038
1039         /*
1040          * Make sure the mode bits are present in the first palette entry
1041          */
1042         fbi->palette_cpu[0] &= 0xcfff;
1043         fbi->palette_cpu[0] |= palette_pbs(&fbi->fb.var);
1044
1045         /* Sequence from 11.7.10 */
1046         LCCR3 = fbi->reg_lccr3;
1047         LCCR2 = fbi->reg_lccr2;
1048         LCCR1 = fbi->reg_lccr1;
1049         LCCR0 = fbi->reg_lccr0 & ~LCCR0_LEN;
1050         DBAR1 = fbi->dbar1;
1051         DBAR2 = fbi->dbar2;
1052         LCCR0 |= LCCR0_LEN;
1053
1054         if (machine_is_shannon()) {
1055                 GPDR |= SHANNON_GPIO_DISP_EN;
1056                 GPSR |= SHANNON_GPIO_DISP_EN;
1057         }
1058
1059         DPRINTK("DBAR1 = 0x%08x\n", DBAR1);
1060         DPRINTK("DBAR2 = 0x%08x\n", DBAR2);
1061         DPRINTK("LCCR0 = 0x%08x\n", LCCR0);
1062         DPRINTK("LCCR1 = 0x%08x\n", LCCR1);
1063         DPRINTK("LCCR2 = 0x%08x\n", LCCR2);
1064         DPRINTK("LCCR3 = 0x%08x\n", LCCR3);
1065 }
1066
1067 static void sa1100fb_disable_controller(struct sa1100fb_info *fbi)
1068 {
1069         DECLARE_WAITQUEUE(wait, current);
1070
1071         DPRINTK("Disabling LCD controller\n");
1072
1073         if (machine_is_shannon()) {
1074                 GPCR |= SHANNON_GPIO_DISP_EN;
1075         }       
1076
1077         set_current_state(TASK_UNINTERRUPTIBLE);
1078         add_wait_queue(&fbi->ctrlr_wait, &wait);
1079
1080         LCSR = 0xffffffff;      /* Clear LCD Status Register */
1081         LCCR0 &= ~LCCR0_LDM;    /* Enable LCD Disable Done Interrupt */
1082         LCCR0 &= ~LCCR0_LEN;    /* Disable LCD Controller */
1083
1084         schedule_timeout(20 * HZ / 1000);
1085         remove_wait_queue(&fbi->ctrlr_wait, &wait);
1086 }
1087
1088 /*
1089  *  sa1100fb_handle_irq: Handle 'LCD DONE' interrupts.
1090  */
1091 static irqreturn_t sa1100fb_handle_irq(int irq, void *dev_id, struct pt_regs *regs)
1092 {
1093         struct sa1100fb_info *fbi = dev_id;
1094         unsigned int lcsr = LCSR;
1095
1096         if (lcsr & LCSR_LDD) {
1097                 LCCR0 |= LCCR0_LDM;
1098                 wake_up(&fbi->ctrlr_wait);
1099         }
1100
1101         LCSR = lcsr;
1102         return IRQ_HANDLED;
1103 }
1104
1105 /*
1106  * This function must be called from task context only, since it will
1107  * sleep when disabling the LCD controller, or if we get two contending
1108  * processes trying to alter state.
1109  */
1110 static void set_ctrlr_state(struct sa1100fb_info *fbi, u_int state)
1111 {
1112         u_int old_state;
1113
1114         down(&fbi->ctrlr_sem);
1115
1116         old_state = fbi->state;
1117
1118         /*
1119          * Hack around fbcon initialisation.
1120          */
1121         if (old_state == C_STARTUP && state == C_REENABLE)
1122                 state = C_ENABLE;
1123
1124         switch (state) {
1125         case C_DISABLE_CLKCHANGE:
1126                 /*
1127                  * Disable controller for clock change.  If the
1128                  * controller is already disabled, then do nothing.
1129                  */
1130                 if (old_state != C_DISABLE && old_state != C_DISABLE_PM) {
1131                         fbi->state = state;
1132                         sa1100fb_disable_controller(fbi);
1133                 }
1134                 break;
1135
1136         case C_DISABLE_PM:
1137         case C_DISABLE:
1138                 /*
1139                  * Disable controller
1140                  */
1141                 if (old_state != C_DISABLE) {
1142                         fbi->state = state;
1143
1144                         __sa1100fb_backlight_power(fbi, 0);
1145                         if (old_state != C_DISABLE_CLKCHANGE)
1146                                 sa1100fb_disable_controller(fbi);
1147                         __sa1100fb_lcd_power(fbi, 0);
1148                 }
1149                 break;
1150
1151         case C_ENABLE_CLKCHANGE:
1152                 /*
1153                  * Enable the controller after clock change.  Only
1154                  * do this if we were disabled for the clock change.
1155                  */
1156                 if (old_state == C_DISABLE_CLKCHANGE) {
1157                         fbi->state = C_ENABLE;
1158                         sa1100fb_enable_controller(fbi);
1159                 }
1160                 break;
1161
1162         case C_REENABLE:
1163                 /*
1164                  * Re-enable the controller only if it was already
1165                  * enabled.  This is so we reprogram the control
1166                  * registers.
1167                  */
1168                 if (old_state == C_ENABLE) {
1169                         sa1100fb_disable_controller(fbi);
1170                         sa1100fb_setup_gpio(fbi);
1171                         sa1100fb_enable_controller(fbi);
1172                 }
1173                 break;
1174
1175         case C_ENABLE_PM:
1176                 /*
1177                  * Re-enable the controller after PM.  This is not
1178                  * perfect - think about the case where we were doing
1179                  * a clock change, and we suspended half-way through.
1180                  */
1181                 if (old_state != C_DISABLE_PM)
1182                         break;
1183                 /* fall through */
1184
1185         case C_ENABLE:
1186                 /*
1187                  * Power up the LCD screen, enable controller, and
1188                  * turn on the backlight.
1189                  */
1190                 if (old_state != C_ENABLE) {
1191                         fbi->state = C_ENABLE;
1192                         sa1100fb_setup_gpio(fbi);
1193                         __sa1100fb_lcd_power(fbi, 1);
1194                         sa1100fb_enable_controller(fbi);
1195                         __sa1100fb_backlight_power(fbi, 1);
1196                 }
1197                 break;
1198         }
1199         up(&fbi->ctrlr_sem);
1200 }
1201
1202 /*
1203  * Our LCD controller task (which is called when we blank or unblank)
1204  * via keventd.
1205  */
1206 static void sa1100fb_task(void *dummy)
1207 {
1208         struct sa1100fb_info *fbi = dummy;
1209         u_int state = xchg(&fbi->task_state, -1);
1210
1211         set_ctrlr_state(fbi, state);
1212 }
1213
1214 #ifdef CONFIG_CPU_FREQ
1215 /*
1216  * Calculate the minimum DMA period over all displays that we own.
1217  * This, together with the SDRAM bandwidth defines the slowest CPU
1218  * frequency that can be selected.
1219  */
1220 static unsigned int sa1100fb_min_dma_period(struct sa1100fb_info *fbi)
1221 {
1222 #if 0
1223         unsigned int min_period = (unsigned int)-1;
1224         int i;
1225
1226         for (i = 0; i < MAX_NR_CONSOLES; i++) {
1227                 struct display *disp = &fb_display[i];
1228                 unsigned int period;
1229
1230                 /*
1231                  * Do we own this display?
1232                  */
1233                 if (disp->fb_info != &fbi->fb)
1234                         continue;
1235
1236                 /*
1237                  * Ok, calculate its DMA period
1238                  */
1239                 period = sa1100fb_display_dma_period(&disp->var);
1240                 if (period < min_period)
1241                         min_period = period;
1242         }
1243
1244         return min_period;
1245 #else
1246         /*
1247          * FIXME: we need to verify _all_ consoles.
1248          */
1249         return sa1100fb_display_dma_period(&fbi->fb.var);
1250 #endif
1251 }
1252
1253 /*
1254  * CPU clock speed change handler.  We need to adjust the LCD timing
1255  * parameters when the CPU clock is adjusted by the power management
1256  * subsystem.
1257  */
1258 static int
1259 sa1100fb_freq_transition(struct notifier_block *nb, unsigned long val,
1260                          void *data)
1261 {
1262         struct sa1100fb_info *fbi = TO_INF(nb, freq_transition);
1263         struct cpufreq_freqs *f = data;
1264         u_int pcd;
1265
1266         switch (val) {
1267         case CPUFREQ_PRECHANGE:
1268                 set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
1269                 break;
1270
1271         case CPUFREQ_POSTCHANGE:
1272                 pcd = get_pcd(fbi->fb.var.pixclock, f->new);
1273                 fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
1274                 set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
1275                 break;
1276         }
1277         return 0;
1278 }
1279
1280 static int
1281 sa1100fb_freq_policy(struct notifier_block *nb, unsigned long val,
1282                      void *data)
1283 {
1284         struct sa1100fb_info *fbi = TO_INF(nb, freq_policy);
1285         struct cpufreq_policy *policy = data;
1286
1287         switch (val) {
1288         case CPUFREQ_ADJUST:
1289         case CPUFREQ_INCOMPATIBLE:
1290                 printk(KERN_DEBUG "min dma period: %d ps, "
1291                         "new clock %d kHz\n", sa1100fb_min_dma_period(fbi),
1292                         policy->max);
1293                 /* todo: fill in min/max values */
1294                 break;
1295         case CPUFREQ_NOTIFY:
1296                 do {} while(0);
1297                 /* todo: panic if min/max values aren't fulfilled 
1298                  * [can't really happen unless there's a bug in the
1299                  * CPU policy verififcation process *
1300                  */
1301                 break;
1302         }
1303         return 0;
1304 }
1305 #endif
1306
1307 #ifdef CONFIG_PM
1308 /*
1309  * Power management hooks.  Note that we won't be called from IRQ context,
1310  * unlike the blank functions above, so we may sleep.
1311  */
1312 static int sa1100fb_suspend(struct device *dev, pm_message_t state)
1313 {
1314         struct sa1100fb_info *fbi = dev_get_drvdata(dev);
1315
1316         set_ctrlr_state(fbi, C_DISABLE_PM);
1317         return 0;
1318 }
1319
1320 static int sa1100fb_resume(struct device *dev)
1321 {
1322         struct sa1100fb_info *fbi = dev_get_drvdata(dev);
1323
1324         set_ctrlr_state(fbi, C_ENABLE_PM);
1325         return 0;
1326 }
1327 #else
1328 #define sa1100fb_suspend        NULL
1329 #define sa1100fb_resume         NULL
1330 #endif
1331
1332 /*
1333  * sa1100fb_map_video_memory():
1334  *      Allocates the DRAM memory for the frame buffer.  This buffer is  
1335  *      remapped into a non-cached, non-buffered, memory region to  
1336  *      allow palette and pixel writes to occur without flushing the 
1337  *      cache.  Once this area is remapped, all virtual memory
1338  *      access to the video memory should occur at the new region.
1339  */
1340 static int __init sa1100fb_map_video_memory(struct sa1100fb_info *fbi)
1341 {
1342         /*
1343          * We reserve one page for the palette, plus the size
1344          * of the framebuffer.
1345          */
1346         fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE);
1347         fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
1348                                               &fbi->map_dma, GFP_KERNEL);
1349
1350         if (fbi->map_cpu) {
1351                 fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE;
1352                 fbi->screen_dma = fbi->map_dma + PAGE_SIZE;
1353                 /*
1354                  * FIXME: this is actually the wrong thing to place in
1355                  * smem_start.  But fbdev suffers from the problem that
1356                  * it needs an API which doesn't exist (in this case,
1357                  * dma_writecombine_mmap)
1358                  */
1359                 fbi->fb.fix.smem_start = fbi->screen_dma;
1360         }
1361
1362         return fbi->map_cpu ? 0 : -ENOMEM;
1363 }
1364
1365 /* Fake monspecs to fill in fbinfo structure */
1366 static struct fb_monspecs monspecs __initdata = {
1367         .hfmin  = 30000,
1368         .hfmax  = 70000,
1369         .vfmin  = 50,
1370         .vfmax  = 65,
1371 };
1372
1373
1374 static struct sa1100fb_info * __init sa1100fb_init_fbinfo(struct device *dev)
1375 {
1376         struct sa1100fb_mach_info *inf;
1377         struct sa1100fb_info *fbi;
1378
1379         fbi = kmalloc(sizeof(struct sa1100fb_info) + sizeof(u32) * 16,
1380                       GFP_KERNEL);
1381         if (!fbi)
1382                 return NULL;
1383
1384         memset(fbi, 0, sizeof(struct sa1100fb_info));
1385         fbi->dev = dev;
1386
1387         strcpy(fbi->fb.fix.id, SA1100_NAME);
1388
1389         fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
1390         fbi->fb.fix.type_aux    = 0;
1391         fbi->fb.fix.xpanstep    = 0;
1392         fbi->fb.fix.ypanstep    = 0;
1393         fbi->fb.fix.ywrapstep   = 0;
1394         fbi->fb.fix.accel       = FB_ACCEL_NONE;
1395
1396         fbi->fb.var.nonstd      = 0;
1397         fbi->fb.var.activate    = FB_ACTIVATE_NOW;
1398         fbi->fb.var.height      = -1;
1399         fbi->fb.var.width       = -1;
1400         fbi->fb.var.accel_flags = 0;
1401         fbi->fb.var.vmode       = FB_VMODE_NONINTERLACED;
1402
1403         fbi->fb.fbops           = &sa1100fb_ops;
1404         fbi->fb.flags           = FBINFO_DEFAULT;
1405         fbi->fb.monspecs        = monspecs;
1406         fbi->fb.pseudo_palette  = (fbi + 1);
1407
1408         fbi->rgb[RGB_8]         = &rgb_8;
1409         fbi->rgb[RGB_16]        = &def_rgb_16;
1410
1411         inf = sa1100fb_get_machine_info(fbi);
1412
1413         /*
1414          * People just don't seem to get this.  We don't support
1415          * anything but correct entries now, so panic if someone
1416          * does something stupid.
1417          */
1418         if (inf->lccr3 & (LCCR3_VrtSnchL|LCCR3_HorSnchL|0xff) ||
1419             inf->pixclock == 0)
1420                 panic("sa1100fb error: invalid LCCR3 fields set or zero "
1421                         "pixclock.");
1422
1423         fbi->max_xres                   = inf->xres;
1424         fbi->fb.var.xres                = inf->xres;
1425         fbi->fb.var.xres_virtual        = inf->xres;
1426         fbi->max_yres                   = inf->yres;
1427         fbi->fb.var.yres                = inf->yres;
1428         fbi->fb.var.yres_virtual        = inf->yres;
1429         fbi->max_bpp                    = inf->bpp;
1430         fbi->fb.var.bits_per_pixel      = inf->bpp;
1431         fbi->fb.var.pixclock            = inf->pixclock;
1432         fbi->fb.var.hsync_len           = inf->hsync_len;
1433         fbi->fb.var.left_margin         = inf->left_margin;
1434         fbi->fb.var.right_margin        = inf->right_margin;
1435         fbi->fb.var.vsync_len           = inf->vsync_len;
1436         fbi->fb.var.upper_margin        = inf->upper_margin;
1437         fbi->fb.var.lower_margin        = inf->lower_margin;
1438         fbi->fb.var.sync                = inf->sync;
1439         fbi->fb.var.grayscale           = inf->cmap_greyscale;
1440         fbi->cmap_inverse               = inf->cmap_inverse;
1441         fbi->cmap_static                = inf->cmap_static;
1442         fbi->lccr0                      = inf->lccr0;
1443         fbi->lccr3                      = inf->lccr3;
1444         fbi->state                      = C_STARTUP;
1445         fbi->task_state                 = (u_char)-1;
1446         fbi->fb.fix.smem_len            = fbi->max_xres * fbi->max_yres *
1447                                           fbi->max_bpp / 8;
1448
1449         init_waitqueue_head(&fbi->ctrlr_wait);
1450         INIT_WORK(&fbi->task, sa1100fb_task, fbi);
1451         init_MUTEX(&fbi->ctrlr_sem);
1452
1453         return fbi;
1454 }
1455
1456 static int __init sa1100fb_probe(struct device *dev)
1457 {
1458         struct sa1100fb_info *fbi;
1459         int ret;
1460
1461         if (!request_mem_region(0xb0100000, 0x10000, "LCD"))
1462                 return -EBUSY;
1463
1464         fbi = sa1100fb_init_fbinfo(dev);
1465         ret = -ENOMEM;
1466         if (!fbi)
1467                 goto failed;
1468
1469         /* Initialize video memory */
1470         ret = sa1100fb_map_video_memory(fbi);
1471         if (ret)
1472                 goto failed;
1473
1474         ret = request_irq(IRQ_LCD, sa1100fb_handle_irq, SA_INTERRUPT,
1475                           "LCD", fbi);
1476         if (ret) {
1477                 printk(KERN_ERR "sa1100fb: request_irq failed: %d\n", ret);
1478                 goto failed;
1479         }
1480
1481 #ifdef ASSABET_PAL_VIDEO
1482         if (machine_is_assabet())
1483                 ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
1484 #endif
1485
1486         /*
1487          * This makes sure that our colour bitfield
1488          * descriptors are correctly initialised.
1489          */
1490         sa1100fb_check_var(&fbi->fb.var, &fbi->fb);
1491
1492         dev_set_drvdata(dev, fbi);
1493
1494         ret = register_framebuffer(&fbi->fb);
1495         if (ret < 0)
1496                 goto failed;
1497
1498 #ifdef CONFIG_CPU_FREQ
1499         fbi->freq_transition.notifier_call = sa1100fb_freq_transition;
1500         fbi->freq_policy.notifier_call = sa1100fb_freq_policy;
1501         cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
1502         cpufreq_register_notifier(&fbi->freq_policy, CPUFREQ_POLICY_NOTIFIER);
1503 #endif
1504
1505         /* This driver cannot be unloaded at the moment */
1506         return 0;
1507
1508 failed:
1509         dev_set_drvdata(dev, NULL);
1510         kfree(fbi);
1511         release_mem_region(0xb0100000, 0x10000);
1512         return ret;
1513 }
1514
1515 static struct device_driver sa1100fb_driver = {
1516         .name           = "sa11x0-fb",
1517         .bus            = &platform_bus_type,
1518         .probe          = sa1100fb_probe,
1519         .suspend        = sa1100fb_suspend,
1520         .resume         = sa1100fb_resume,
1521 };
1522
1523 int __init sa1100fb_init(void)
1524 {
1525         if (fb_get_options("sa1100fb", NULL))
1526                 return -ENODEV;
1527
1528         return driver_register(&sa1100fb_driver);
1529 }
1530
1531 int __init sa1100fb_setup(char *options)
1532 {
1533 #if 0
1534         char *this_opt;
1535
1536         if (!options || !*options)
1537                 return 0;
1538
1539         while ((this_opt = strsep(&options, ",")) != NULL) {
1540
1541                 if (!strncmp(this_opt, "bpp:", 4))
1542                         current_par.max_bpp =
1543                             simple_strtoul(this_opt + 4, NULL, 0);
1544
1545                 if (!strncmp(this_opt, "lccr0:", 6))
1546                         lcd_shadow.lccr0 =
1547                             simple_strtoul(this_opt + 6, NULL, 0);
1548                 if (!strncmp(this_opt, "lccr1:", 6)) {
1549                         lcd_shadow.lccr1 =
1550                             simple_strtoul(this_opt + 6, NULL, 0);
1551                         current_par.max_xres =
1552                             (lcd_shadow.lccr1 & 0x3ff) + 16;
1553                 }
1554                 if (!strncmp(this_opt, "lccr2:", 6)) {
1555                         lcd_shadow.lccr2 =
1556                             simple_strtoul(this_opt + 6, NULL, 0);
1557                         current_par.max_yres =
1558                             (lcd_shadow.
1559                              lccr0 & LCCR0_SDS) ? ((lcd_shadow.
1560                                                     lccr2 & 0x3ff) +
1561                                                    1) *
1562                             2 : ((lcd_shadow.lccr2 & 0x3ff) + 1);
1563                 }
1564                 if (!strncmp(this_opt, "lccr3:", 6))
1565                         lcd_shadow.lccr3 =
1566                             simple_strtoul(this_opt + 6, NULL, 0);
1567         }
1568 #endif
1569         return 0;
1570 }
1571
1572 module_init(sa1100fb_init);
1573 MODULE_DESCRIPTION("StrongARM-1100/1110 framebuffer driver");
1574 MODULE_LICENSE("GPL");