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ext4: fix undefined behavior in ext4_fill_flex_info()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / omap / hwa742.c
blobca51583ec98a8040bbba3d4b0039cf707ae9ef60
1 /*
2 * Epson HWA742 LCD controller driver
3 *
4 * Copyright (C) 2004-2005 Nokia Corporation
5 * Authors: Juha Yrjölä <juha.yrjola@nokia.com>
6 * Imre Deak <imre.deak@nokia.com>
7 * YUV support: Jussi Laako <jussi.laako@nokia.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23 #include <linux/module.h>
24 #include <linux/mm.h>
25 #include <linux/fb.h>
26 #include <linux/delay.h>
27 #include <linux/clk.h>
28
29 #include <mach/dma.h>
30 #include <mach/omapfb.h>
31 #include <mach/hwa742.h>
32
33 #define HWA742_REV_CODE_REG 0x0
34 #define HWA742_CONFIG_REG 0x2
35 #define HWA742_PLL_DIV_REG 0x4
36 #define HWA742_PLL_0_REG 0x6
37 #define HWA742_PLL_1_REG 0x8
38 #define HWA742_PLL_2_REG 0xa
39 #define HWA742_PLL_3_REG 0xc
40 #define HWA742_PLL_4_REG 0xe
41 #define HWA742_CLK_SRC_REG 0x12
42 #define HWA742_PANEL_TYPE_REG 0x14
43 #define HWA742_H_DISP_REG 0x16
44 #define HWA742_H_NDP_REG 0x18
45 #define HWA742_V_DISP_1_REG 0x1a
46 #define HWA742_V_DISP_2_REG 0x1c
47 #define HWA742_V_NDP_REG 0x1e
48 #define HWA742_HS_W_REG 0x20
49 #define HWA742_HP_S_REG 0x22
50 #define HWA742_VS_W_REG 0x24
51 #define HWA742_VP_S_REG 0x26
52 #define HWA742_PCLK_POL_REG 0x28
53 #define HWA742_INPUT_MODE_REG 0x2a
54 #define HWA742_TRANSL_MODE_REG1 0x2e
55 #define HWA742_DISP_MODE_REG 0x34
56 #define HWA742_WINDOW_TYPE 0x36
57 #define HWA742_WINDOW_X_START_0 0x38
58 #define HWA742_WINDOW_X_START_1 0x3a
59 #define HWA742_WINDOW_Y_START_0 0x3c
60 #define HWA742_WINDOW_Y_START_1 0x3e
61 #define HWA742_WINDOW_X_END_0 0x40
62 #define HWA742_WINDOW_X_END_1 0x42
63 #define HWA742_WINDOW_Y_END_0 0x44
64 #define HWA742_WINDOW_Y_END_1 0x46
65 #define HWA742_MEMORY_WRITE_LSB 0x48
66 #define HWA742_MEMORY_WRITE_MSB 0x49
67 #define HWA742_MEMORY_READ_0 0x4a
68 #define HWA742_MEMORY_READ_1 0x4c
69 #define HWA742_MEMORY_READ_2 0x4e
70 #define HWA742_POWER_SAVE 0x56
71 #define HWA742_NDP_CTRL 0x58
72
73 #define HWA742_AUTO_UPDATE_TIME (HZ / 20)
74
75 /* Reserve 4 request slots for requests in irq context */
76 #define REQ_POOL_SIZE 24
77 #define IRQ_REQ_POOL_SIZE 4
78
79 #define REQ_FROM_IRQ_POOL 0x01
80
81 #define REQ_COMPLETE 0
82 #define REQ_PENDING 1
83
84 struct update_param {
85 int x, y, width, height;
86 int color_mode;
87 int flags;
88 };
89
90 struct hwa742_request {
91 struct list_head entry;
92 unsigned int flags;
93
94 int (*handler)(struct hwa742_request *req);
95 void (*complete)(void *data);
96 void *complete_data;
97
98 union {
99 struct update_param update;
100 struct completion *sync;
101 } par;
102 };
103
104 struct {
105 enum omapfb_update_mode update_mode;
106 enum omapfb_update_mode update_mode_before_suspend;
107
108 struct timer_list auto_update_timer;
109 int stop_auto_update;
110 struct omapfb_update_window auto_update_window;
111 unsigned te_connected:1;
112 unsigned vsync_only:1;
113
114 struct hwa742_request req_pool[REQ_POOL_SIZE];
115 struct list_head pending_req_list;
116 struct list_head free_req_list;
117 struct semaphore req_sema;
118 spinlock_t req_lock;
119
120 struct extif_timings reg_timings, lut_timings;
121
122 int prev_color_mode;
123 int prev_flags;
124 int window_type;
125
126 u32 max_transmit_size;
127 u32 extif_clk_period;
128 unsigned long pix_tx_time;
129 unsigned long line_upd_time;
130
131
132 struct omapfb_device *fbdev;
133 struct lcd_ctrl_extif *extif;
134 const struct lcd_ctrl *int_ctrl;
135
136 struct clk *sys_ck;
137 } hwa742;
138
139 struct lcd_ctrl hwa742_ctrl;
140
141 static u8 hwa742_read_reg(u8 reg)
142 {
143 u8 data;
144
145 hwa742.extif->set_bits_per_cycle(8);
146 hwa742.extif->write_command(&reg, 1);
147 hwa742.extif->read_data(&data, 1);
148
149 return data;
150 }
151
152 static void hwa742_write_reg(u8 reg, u8 data)
153 {
154 hwa742.extif->set_bits_per_cycle(8);
155 hwa742.extif->write_command(&reg, 1);
156 hwa742.extif->write_data(&data, 1);
157 }
158
159 static void set_window_regs(int x_start, int y_start, int x_end, int y_end)
160 {
161 u8 tmp[8];
162 u8 cmd;
163
164 x_end--;
165 y_end--;
166 tmp[0] = x_start;
167 tmp[1] = x_start >> 8;
168 tmp[2] = y_start;
169 tmp[3] = y_start >> 8;
170 tmp[4] = x_end;
171 tmp[5] = x_end >> 8;
172 tmp[6] = y_end;
173 tmp[7] = y_end >> 8;
174
175 hwa742.extif->set_bits_per_cycle(8);
176 cmd = HWA742_WINDOW_X_START_0;
177
178 hwa742.extif->write_command(&cmd, 1);
179
180 hwa742.extif->write_data(tmp, 8);
181 }
182
183 static void set_format_regs(int conv, int transl, int flags)
184 {
185 if (flags & OMAPFB_FORMAT_FLAG_DOUBLE) {
186 hwa742.window_type = ((hwa742.window_type & 0xfc) | 0x01);
187 #ifdef VERBOSE
188 dev_dbg(hwa742.fbdev->dev, "hwa742: enabled pixel doubling\n");
189 #endif
190 } else {
191 hwa742.window_type = (hwa742.window_type & 0xfc);
192 #ifdef VERBOSE
193 dev_dbg(hwa742.fbdev->dev, "hwa742: disabled pixel doubling\n");
194 #endif
195 }
196
197 hwa742_write_reg(HWA742_INPUT_MODE_REG, conv);
198 hwa742_write_reg(HWA742_TRANSL_MODE_REG1, transl);
199 hwa742_write_reg(HWA742_WINDOW_TYPE, hwa742.window_type);
200 }
201
202 static void enable_tearsync(int y, int width, int height, int screen_height,
203 int force_vsync)
204 {
205 u8 b;
206
207 b = hwa742_read_reg(HWA742_NDP_CTRL);
208 b |= 1 << 2;
209 hwa742_write_reg(HWA742_NDP_CTRL, b);
210
211 if (likely(hwa742.vsync_only || force_vsync)) {
212 hwa742.extif->enable_tearsync(1, 0);
213 return;
214 }
215
216 if (width * hwa742.pix_tx_time < hwa742.line_upd_time) {
217 hwa742.extif->enable_tearsync(1, 0);
218 return;
219 }
220
221 if ((width * hwa742.pix_tx_time / 1000) * height <
222 (y + height) * (hwa742.line_upd_time / 1000)) {
223 hwa742.extif->enable_tearsync(1, 0);
224 return;
225 }
226
227 hwa742.extif->enable_tearsync(1, y + 1);
228 }
229
230 static void disable_tearsync(void)
231 {
232 u8 b;
233
234 hwa742.extif->enable_tearsync(0, 0);
235
236 b = hwa742_read_reg(HWA742_NDP_CTRL);
237 b &= ~(1 << 2);
238 hwa742_write_reg(HWA742_NDP_CTRL, b);
239 }
240
241 static inline struct hwa742_request *alloc_req(void)
242 {
243 unsigned long flags;
244 struct hwa742_request *req;
245 int req_flags = 0;
246
247 if (!in_interrupt())
248 down(&hwa742.req_sema);
249 else
250 req_flags = REQ_FROM_IRQ_POOL;
251
252 spin_lock_irqsave(&hwa742.req_lock, flags);
253 BUG_ON(list_empty(&hwa742.free_req_list));
254 req = list_entry(hwa742.free_req_list.next,
255 struct hwa742_request, entry);
256 list_del(&req->entry);
257 spin_unlock_irqrestore(&hwa742.req_lock, flags);
258
259 INIT_LIST_HEAD(&req->entry);
260 req->flags = req_flags;
261
262 return req;
263 }
264
265 static inline void free_req(struct hwa742_request *req)
266 {
267 unsigned long flags;
268
269 spin_lock_irqsave(&hwa742.req_lock, flags);
270
271 list_del(&req->entry);
272 list_add(&req->entry, &hwa742.free_req_list);
273 if (!(req->flags & REQ_FROM_IRQ_POOL))
274 up(&hwa742.req_sema);
275
276 spin_unlock_irqrestore(&hwa742.req_lock, flags);
277 }
278
279 static void process_pending_requests(void)
280 {
281 unsigned long flags;
282
283 spin_lock_irqsave(&hwa742.req_lock, flags);
284
285 while (!list_empty(&hwa742.pending_req_list)) {
286 struct hwa742_request *req;
287 void (*complete)(void *);
288 void *complete_data;
289
290 req = list_entry(hwa742.pending_req_list.next,
291 struct hwa742_request, entry);
292 spin_unlock_irqrestore(&hwa742.req_lock, flags);
293
294 if (req->handler(req) == REQ_PENDING)
295 return;
296
297 complete = req->complete;
298 complete_data = req->complete_data;
299 free_req(req);
300
301 if (complete)
302 complete(complete_data);
303
304 spin_lock_irqsave(&hwa742.req_lock, flags);
305 }
306
307 spin_unlock_irqrestore(&hwa742.req_lock, flags);
308 }
309
310 static void submit_req_list(struct list_head *head)
311 {
312 unsigned long flags;
313 int process = 1;
314
315 spin_lock_irqsave(&hwa742.req_lock, flags);
316 if (likely(!list_empty(&hwa742.pending_req_list)))
317 process = 0;
318 list_splice_init(head, hwa742.pending_req_list.prev);
319 spin_unlock_irqrestore(&hwa742.req_lock, flags);
320
321 if (process)
322 process_pending_requests();
323 }
324
325 static void request_complete(void *data)
326 {
327 struct hwa742_request *req = (struct hwa742_request *)data;
328 void (*complete)(void *);
329 void *complete_data;
330
331 complete = req->complete;
332 complete_data = req->complete_data;
333
334 free_req(req);
335
336 if (complete)
337 complete(complete_data);
338
339 process_pending_requests();
340 }
341
342 static int send_frame_handler(struct hwa742_request *req)
343 {
344 struct update_param *par = &req->par.update;
345 int x = par->x;
346 int y = par->y;
347 int w = par->width;
348 int h = par->height;
349 int bpp;
350 int conv, transl;
351 unsigned long offset;
352 int color_mode = par->color_mode;
353 int flags = par->flags;
354 int scr_width = hwa742.fbdev->panel->x_res;
355 int scr_height = hwa742.fbdev->panel->y_res;
356
357 #ifdef VERBOSE
358 dev_dbg(hwa742.fbdev->dev, "x %d y %d w %d h %d scr_width %d "
359 "color_mode %d flags %d\n",
360 x, y, w, h, scr_width, color_mode, flags);
361 #endif
362
363 switch (color_mode) {
364 case OMAPFB_COLOR_YUV422:
365 bpp = 16;
366 conv = 0x08;
367 transl = 0x25;
368 break;
369 case OMAPFB_COLOR_YUV420:
370 bpp = 12;
371 conv = 0x09;
372 transl = 0x25;
373 break;
374 case OMAPFB_COLOR_RGB565:
375 bpp = 16;
376 conv = 0x01;
377 transl = 0x05;
378 break;
379 default:
380 return -EINVAL;
381 }
382
383 if (hwa742.prev_flags != flags ||
384 hwa742.prev_color_mode != color_mode) {
385 set_format_regs(conv, transl, flags);
386 hwa742.prev_color_mode = color_mode;
387 hwa742.prev_flags = flags;
388 }
389 flags = req->par.update.flags;
390 if (flags & OMAPFB_FORMAT_FLAG_TEARSYNC)
391 enable_tearsync(y, scr_width, h, scr_height,
392 flags & OMAPFB_FORMAT_FLAG_FORCE_VSYNC);
393 else
394 disable_tearsync();
395
396 set_window_regs(x, y, x + w, y + h);
397
398 offset = (scr_width * y + x) * bpp / 8;
399
400 hwa742.int_ctrl->setup_plane(OMAPFB_PLANE_GFX,
401 OMAPFB_CHANNEL_OUT_LCD, offset, scr_width, 0, 0, w, h,
402 color_mode);
403
404 hwa742.extif->set_bits_per_cycle(16);
405
406 hwa742.int_ctrl->enable_plane(OMAPFB_PLANE_GFX, 1);
407 hwa742.extif->transfer_area(w, h, request_complete, req);
408
409 return REQ_PENDING;
410 }
411
412 static void send_frame_complete(void *data)
413 {
414 hwa742.int_ctrl->enable_plane(OMAPFB_PLANE_GFX, 0);
415 }
416
417 #define ADD_PREQ(_x, _y, _w, _h) do { \
418 req = alloc_req(); \
419 req->handler = send_frame_handler; \
420 req->complete = send_frame_complete; \
421 req->par.update.x = _x; \
422 req->par.update.y = _y; \
423 req->par.update.width = _w; \
424 req->par.update.height = _h; \
425 req->par.update.color_mode = color_mode;\
426 req->par.update.flags = flags; \
427 list_add_tail(&req->entry, req_head); \
428 } while(0)
429
430 static void create_req_list(struct omapfb_update_window *win,
431 struct list_head *req_head)
432 {
433 struct hwa742_request *req;
434 int x = win->x;
435 int y = win->y;
436 int width = win->width;
437 int height = win->height;
438 int color_mode;
439 int flags;
440
441 flags = win->format & ~OMAPFB_FORMAT_MASK;
442 color_mode = win->format & OMAPFB_FORMAT_MASK;
443
444 if (x & 1) {
445 ADD_PREQ(x, y, 1, height);
446 width--;
447 x++;
448 flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
449 }
450 if (width & ~1) {
451 unsigned int xspan = width & ~1;
452 unsigned int ystart = y;
453 unsigned int yspan = height;
454
455 if (xspan * height * 2 > hwa742.max_transmit_size) {
456 yspan = hwa742.max_transmit_size / (xspan * 2);
457 ADD_PREQ(x, ystart, xspan, yspan);
458 ystart += yspan;
459 yspan = height - yspan;
460 flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
461 }
462
463 ADD_PREQ(x, ystart, xspan, yspan);
464 x += xspan;
465 width -= xspan;
466 flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
467 }
468 if (width)
469 ADD_PREQ(x, y, 1, height);
470 }
471
472 static void auto_update_complete(void *data)
473 {
474 if (!hwa742.stop_auto_update)
475 mod_timer(&hwa742.auto_update_timer,
476 jiffies + HWA742_AUTO_UPDATE_TIME);
477 }
478
479 static void hwa742_update_window_auto(unsigned long arg)
480 {
481 LIST_HEAD(req_list);
482 struct hwa742_request *last;
483
484 create_req_list(&hwa742.auto_update_window, &req_list);
485 last = list_entry(req_list.prev, struct hwa742_request, entry);
486
487 last->complete = auto_update_complete;
488 last->complete_data = NULL;
489
490 submit_req_list(&req_list);
491 }
492
493 int hwa742_update_window_async(struct fb_info *fbi,
494 struct omapfb_update_window *win,
495 void (*complete_callback)(void *arg),
496 void *complete_callback_data)
497 {
498 LIST_HEAD(req_list);
499 struct hwa742_request *last;
500 int r = 0;
501
502 if (hwa742.update_mode != OMAPFB_MANUAL_UPDATE) {
503 dev_dbg(hwa742.fbdev->dev, "invalid update mode\n");
504 r = -EINVAL;
505 goto out;
506 }
507 if (unlikely(win->format &
508 ~(0x03 | OMAPFB_FORMAT_FLAG_DOUBLE |
509 OMAPFB_FORMAT_FLAG_TEARSYNC | OMAPFB_FORMAT_FLAG_FORCE_VSYNC))) {
510 dev_dbg(hwa742.fbdev->dev, "invalid window flag\n");
511 r = -EINVAL;
512 goto out;
513 }
514
515 create_req_list(win, &req_list);
516 last = list_entry(req_list.prev, struct hwa742_request, entry);
517
518 last->complete = complete_callback;
519 last->complete_data = (void *)complete_callback_data;
520
521 submit_req_list(&req_list);
522
523 out:
524 return r;
525 }
526 EXPORT_SYMBOL(hwa742_update_window_async);
527
528 static int hwa742_setup_plane(int plane, int channel_out,
529 unsigned long offset, int screen_width,
530 int pos_x, int pos_y, int width, int height,
531 int color_mode)
532 {
533 if (plane != OMAPFB_PLANE_GFX ||
534 channel_out != OMAPFB_CHANNEL_OUT_LCD)
535 return -EINVAL;
536
537 return 0;
538 }
539
540 static int hwa742_enable_plane(int plane, int enable)
541 {
542 if (plane != 0)
543 return -EINVAL;
544
545 hwa742.int_ctrl->enable_plane(plane, enable);
546
547 return 0;
548 }
549
550 static int sync_handler(struct hwa742_request *req)
551 {
552 complete(req->par.sync);
553 return REQ_COMPLETE;
554 }
555
556 static void hwa742_sync(void)
557 {
558 LIST_HEAD(req_list);
559 struct hwa742_request *req;
560 struct completion comp;
561
562 req = alloc_req();
563
564 req->handler = sync_handler;
565 req->complete = NULL;
566 init_completion(&comp);
567 req->par.sync = &comp;
568
569 list_add(&req->entry, &req_list);
570 submit_req_list(&req_list);
571
572 wait_for_completion(&comp);
573 }
574
575 static void hwa742_bind_client(struct omapfb_notifier_block *nb)
576 {
577 dev_dbg(hwa742.fbdev->dev, "update_mode %d\n", hwa742.update_mode);
578 if (hwa742.update_mode == OMAPFB_MANUAL_UPDATE) {
579 omapfb_notify_clients(hwa742.fbdev, OMAPFB_EVENT_READY);
580 }
581 }
582
583 static int hwa742_set_update_mode(enum omapfb_update_mode mode)
584 {
585 if (mode != OMAPFB_MANUAL_UPDATE && mode != OMAPFB_AUTO_UPDATE &&
586 mode != OMAPFB_UPDATE_DISABLED)
587 return -EINVAL;
588
589 if (mode == hwa742.update_mode)
590 return 0;
591
592 dev_info(hwa742.fbdev->dev, "HWA742: setting update mode to %s\n",
593 mode == OMAPFB_UPDATE_DISABLED ? "disabled" :
594 (mode == OMAPFB_AUTO_UPDATE ? "auto" : "manual"));
595
596 switch (hwa742.update_mode) {
597 case OMAPFB_MANUAL_UPDATE:
598 omapfb_notify_clients(hwa742.fbdev, OMAPFB_EVENT_DISABLED);
599 break;
600 case OMAPFB_AUTO_UPDATE:
601 hwa742.stop_auto_update = 1;
602 del_timer_sync(&hwa742.auto_update_timer);
603 break;
604 case OMAPFB_UPDATE_DISABLED:
605 break;
606 }
607
608 hwa742.update_mode = mode;
609 hwa742_sync();
610 hwa742.stop_auto_update = 0;
611
612 switch (mode) {
613 case OMAPFB_MANUAL_UPDATE:
614 omapfb_notify_clients(hwa742.fbdev, OMAPFB_EVENT_READY);
615 break;
616 case OMAPFB_AUTO_UPDATE:
617 hwa742_update_window_auto(0);
618 break;
619 case OMAPFB_UPDATE_DISABLED:
620 break;
621 }
622
623 return 0;
624 }
625
626 static enum omapfb_update_mode hwa742_get_update_mode(void)
627 {
628 return hwa742.update_mode;
629 }
630
631 static unsigned long round_to_extif_ticks(unsigned long ps, int div)
632 {
633 int bus_tick = hwa742.extif_clk_period * div;
634 return (ps + bus_tick - 1) / bus_tick * bus_tick;
635 }
636
637 static int calc_reg_timing(unsigned long sysclk, int div)
638 {
639 struct extif_timings *t;
640 unsigned long systim;
641
642 /* CSOnTime 0, WEOnTime 2 ns, REOnTime 2 ns,
643 * AccessTime 2 ns + 12.2 ns (regs),
644 * WEOffTime = WEOnTime + 1 ns,
645 * REOffTime = REOnTime + 16 ns (regs),
646 * CSOffTime = REOffTime + 1 ns
647 * ReadCycle = 2ns + 2*SYSCLK (regs),
648 * WriteCycle = 2*SYSCLK + 2 ns,
649 * CSPulseWidth = 10 ns */
650 systim = 1000000000 / (sysclk / 1000);
651 dev_dbg(hwa742.fbdev->dev, "HWA742 systim %lu ps extif_clk_period %u ps"
652 "extif_clk_div %d\n", systim, hwa742.extif_clk_period, div);
653
654 t = &hwa742.reg_timings;
655 memset(t, 0, sizeof(*t));
656 t->clk_div = div;
657 t->cs_on_time = 0;
658 t->we_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
659 t->re_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
660 t->access_time = round_to_extif_ticks(t->re_on_time + 12200, div);
661 t->we_off_time = round_to_extif_ticks(t->we_on_time + 1000, div);
662 t->re_off_time = round_to_extif_ticks(t->re_on_time + 16000, div);
663 t->cs_off_time = round_to_extif_ticks(t->re_off_time + 1000, div);
664 t->we_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
665 if (t->we_cycle_time < t->we_off_time)
666 t->we_cycle_time = t->we_off_time;
667 t->re_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
668 if (t->re_cycle_time < t->re_off_time)
669 t->re_cycle_time = t->re_off_time;
670 t->cs_pulse_width = 0;
671
672 dev_dbg(hwa742.fbdev->dev, "[reg]cson %d csoff %d reon %d reoff %d\n",
673 t->cs_on_time, t->cs_off_time, t->re_on_time, t->re_off_time);
674 dev_dbg(hwa742.fbdev->dev, "[reg]weon %d weoff %d recyc %d wecyc %d\n",
675 t->we_on_time, t->we_off_time, t->re_cycle_time,
676 t->we_cycle_time);
677 dev_dbg(hwa742.fbdev->dev, "[reg]rdaccess %d cspulse %d\n",
678 t->access_time, t->cs_pulse_width);
679
680 return hwa742.extif->convert_timings(t);
681 }
682
683 static int calc_lut_timing(unsigned long sysclk, int div)
684 {
685 struct extif_timings *t;
686 unsigned long systim;
687
688 /* CSOnTime 0, WEOnTime 2 ns, REOnTime 2 ns,
689 * AccessTime 2 ns + 4 * SYSCLK + 26 (lut),
690 * WEOffTime = WEOnTime + 1 ns,
691 * REOffTime = REOnTime + 4*SYSCLK + 26 ns (lut),
692 * CSOffTime = REOffTime + 1 ns
693 * ReadCycle = 2ns + 4*SYSCLK + 26 ns (lut),
694 * WriteCycle = 2*SYSCLK + 2 ns,
695 * CSPulseWidth = 10 ns
696 */
697 systim = 1000000000 / (sysclk / 1000);
698 dev_dbg(hwa742.fbdev->dev, "HWA742 systim %lu ps extif_clk_period %u ps"
699 "extif_clk_div %d\n", systim, hwa742.extif_clk_period, div);
700
701 t = &hwa742.lut_timings;
702 memset(t, 0, sizeof(*t));
703
704 t->clk_div = div;
705
706 t->cs_on_time = 0;
707 t->we_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
708 t->re_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
709 t->access_time = round_to_extif_ticks(t->re_on_time + 4 * systim +
710 26000, div);
711 t->we_off_time = round_to_extif_ticks(t->we_on_time + 1000, div);
712 t->re_off_time = round_to_extif_ticks(t->re_on_time + 4 * systim +
713 26000, div);
714 t->cs_off_time = round_to_extif_ticks(t->re_off_time + 1000, div);
715 t->we_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
716 if (t->we_cycle_time < t->we_off_time)
717 t->we_cycle_time = t->we_off_time;
718 t->re_cycle_time = round_to_extif_ticks(2000 + 4 * systim + 26000, div);
719 if (t->re_cycle_time < t->re_off_time)
720 t->re_cycle_time = t->re_off_time;
721 t->cs_pulse_width = 0;
722
723 dev_dbg(hwa742.fbdev->dev, "[lut]cson %d csoff %d reon %d reoff %d\n",
724 t->cs_on_time, t->cs_off_time, t->re_on_time, t->re_off_time);
725 dev_dbg(hwa742.fbdev->dev, "[lut]weon %d weoff %d recyc %d wecyc %d\n",
726 t->we_on_time, t->we_off_time, t->re_cycle_time,
727 t->we_cycle_time);
728 dev_dbg(hwa742.fbdev->dev, "[lut]rdaccess %d cspulse %d\n",
729 t->access_time, t->cs_pulse_width);
730
731 return hwa742.extif->convert_timings(t);
732 }
733
734 static int calc_extif_timings(unsigned long sysclk, int *extif_mem_div)
735 {
736 int max_clk_div;
737 int div;
738
739 hwa742.extif->get_clk_info(&hwa742.extif_clk_period, &max_clk_div);
740 for (div = 1; div < max_clk_div; div++) {
741 if (calc_reg_timing(sysclk, div) == 0)
742 break;
743 }
744 if (div >= max_clk_div)
745 goto err;
746
747 *extif_mem_div = div;
748
749 for (div = 1; div < max_clk_div; div++) {
750 if (calc_lut_timing(sysclk, div) == 0)
751 break;
752 }
753
754 if (div >= max_clk_div)
755 goto err;
756
757 return 0;
758
759 err:
760 dev_err(hwa742.fbdev->dev, "can't setup timings\n");
761 return -1;
762 }
763
764 static void calc_hwa742_clk_rates(unsigned long ext_clk,
765 unsigned long *sys_clk, unsigned long *pix_clk)
766 {
767 int pix_clk_src;
768 int sys_div = 0, sys_mul = 0;
769 int pix_div;
770
771 pix_clk_src = hwa742_read_reg(HWA742_CLK_SRC_REG);
772 pix_div = ((pix_clk_src >> 3) & 0x1f) + 1;
773 if ((pix_clk_src & (0x3 << 1)) == 0) {
774 /* Source is the PLL */
775 sys_div = (hwa742_read_reg(HWA742_PLL_DIV_REG) & 0x3f) + 1;
776 sys_mul = (hwa742_read_reg(HWA742_PLL_4_REG) & 0x7f) + 1;
777 *sys_clk = ext_clk * sys_mul / sys_div;
778 } else /* else source is ext clk, or oscillator */
779 *sys_clk = ext_clk;
780
781 *pix_clk = *sys_clk / pix_div; /* HZ */
782 dev_dbg(hwa742.fbdev->dev,
783 "ext_clk %ld pix_src %d pix_div %d sys_div %d sys_mul %d\n",
784 ext_clk, pix_clk_src & (0x3 << 1), pix_div, sys_div, sys_mul);
785 dev_dbg(hwa742.fbdev->dev, "sys_clk %ld pix_clk %ld\n",
786 *sys_clk, *pix_clk);
787 }
788
789
790 static int setup_tearsync(unsigned long pix_clk, int extif_div)
791 {
792 int hdisp, vdisp;
793 int hndp, vndp;
794 int hsw, vsw;
795 int hs, vs;
796 int hs_pol_inv, vs_pol_inv;
797 int use_hsvs, use_ndp;
798 u8 b;
799
800 hsw = hwa742_read_reg(HWA742_HS_W_REG);
801 vsw = hwa742_read_reg(HWA742_VS_W_REG);
802 hs_pol_inv = !(hsw & 0x80);
803 vs_pol_inv = !(vsw & 0x80);
804 hsw = hsw & 0x7f;
805 vsw = vsw & 0x3f;
806
807 hdisp = (hwa742_read_reg(HWA742_H_DISP_REG) & 0x7f) * 8;
808 vdisp = hwa742_read_reg(HWA742_V_DISP_1_REG) +
809 ((hwa742_read_reg(HWA742_V_DISP_2_REG) & 0x3) << 8);
810
811 hndp = hwa742_read_reg(HWA742_H_NDP_REG) & 0x7f;
812 vndp = hwa742_read_reg(HWA742_V_NDP_REG);
813
814 /* time to transfer one pixel (16bpp) in ps */
815 hwa742.pix_tx_time = hwa742.reg_timings.we_cycle_time;
816 if (hwa742.extif->get_max_tx_rate != NULL) {
817 /*
818 * The external interface might have a rate limitation,
819 * if so, we have to maximize our transfer rate.
820 */
821 unsigned long min_tx_time;
822 unsigned long max_tx_rate = hwa742.extif->get_max_tx_rate();
823
824 dev_dbg(hwa742.fbdev->dev, "max_tx_rate %ld HZ\n",
825 max_tx_rate);
826 min_tx_time = 1000000000 / (max_tx_rate / 1000); /* ps */
827 if (hwa742.pix_tx_time < min_tx_time)
828 hwa742.pix_tx_time = min_tx_time;
829 }
830
831 /* time to update one line in ps */
832 hwa742.line_upd_time = (hdisp + hndp) * 1000000 / (pix_clk / 1000);
833 hwa742.line_upd_time *= 1000;
834 if (hdisp * hwa742.pix_tx_time > hwa742.line_upd_time)
835 /*
836 * transfer speed too low, we might have to use both
837 * HS and VS
838 */
839 use_hsvs = 1;
840 else
841 /* decent transfer speed, we'll always use only VS */
842 use_hsvs = 0;
843
844 if (use_hsvs && (hs_pol_inv || vs_pol_inv)) {
845 /*
846 * HS or'ed with VS doesn't work, use the active high
847 * TE signal based on HNDP / VNDP
848 */
849 use_ndp = 1;
850 hs_pol_inv = 0;
851 vs_pol_inv = 0;
852 hs = hndp;
853 vs = vndp;
854 } else {
855 /*
856 * Use HS or'ed with VS as a TE signal if both are needed
857 * or VNDP if only vsync is needed.
858 */
859 use_ndp = 0;
860 hs = hsw;
861 vs = vsw;
862 if (!use_hsvs) {
863 hs_pol_inv = 0;
864 vs_pol_inv = 0;
865 }
866 }
867
868 hs = hs * 1000000 / (pix_clk / 1000); /* ps */
869 hs *= 1000;
870
871 vs = vs * (hdisp + hndp) * 1000000 / (pix_clk / 1000); /* ps */
872 vs *= 1000;
873
874 if (vs <= hs)
875 return -EDOM;
876 /* set VS to 120% of HS to minimize VS detection time */
877 vs = hs * 12 / 10;
878 /* minimize HS too */
879 hs = 10000;
880
881 b = hwa742_read_reg(HWA742_NDP_CTRL);
882 b &= ~0x3;
883 b |= use_hsvs ? 1 : 0;
884 b |= (use_ndp && use_hsvs) ? 0 : 2;
885 hwa742_write_reg(HWA742_NDP_CTRL, b);
886
887 hwa742.vsync_only = !use_hsvs;
888
889 dev_dbg(hwa742.fbdev->dev,
890 "pix_clk %ld HZ pix_tx_time %ld ps line_upd_time %ld ps\n",
891 pix_clk, hwa742.pix_tx_time, hwa742.line_upd_time);
892 dev_dbg(hwa742.fbdev->dev,
893 "hs %d ps vs %d ps mode %d vsync_only %d\n",
894 hs, vs, (b & 0x3), !use_hsvs);
895
896 return hwa742.extif->setup_tearsync(1, hs, vs,
897 hs_pol_inv, vs_pol_inv, extif_div);
898 }
899
900 static void hwa742_get_caps(int plane, struct omapfb_caps *caps)
901 {
902 hwa742.int_ctrl->get_caps(plane, caps);
903 caps->ctrl |= OMAPFB_CAPS_MANUAL_UPDATE |
904 OMAPFB_CAPS_WINDOW_PIXEL_DOUBLE;
905 if (hwa742.te_connected)
906 caps->ctrl |= OMAPFB_CAPS_TEARSYNC;
907 caps->wnd_color |= (1 << OMAPFB_COLOR_RGB565) |
908 (1 << OMAPFB_COLOR_YUV420);
909 }
910
911 static void hwa742_suspend(void)
912 {
913 hwa742.update_mode_before_suspend = hwa742.update_mode;
914 hwa742_set_update_mode(OMAPFB_UPDATE_DISABLED);
915 /* Enable sleep mode */
916 hwa742_write_reg(HWA742_POWER_SAVE, 1 << 1);
917 clk_disable(hwa742.sys_ck);
918 }
919
920 static void hwa742_resume(void)
921 {
922 clk_enable(hwa742.sys_ck);
923
924 /* Disable sleep mode */
925 hwa742_write_reg(HWA742_POWER_SAVE, 0);
926 while (1) {
927 /* Loop until PLL output is stabilized */
928 if (hwa742_read_reg(HWA742_PLL_DIV_REG) & (1 << 7))
929 break;
930 set_current_state(TASK_UNINTERRUPTIBLE);
931 schedule_timeout(msecs_to_jiffies(5));
932 }
933 hwa742_set_update_mode(hwa742.update_mode_before_suspend);
934 }
935
936 static int hwa742_init(struct omapfb_device *fbdev, int ext_mode,
937 struct omapfb_mem_desc *req_vram)
938 {
939 int r = 0, i;
940 u8 rev, conf;
941 unsigned long ext_clk;
942 unsigned long sys_clk, pix_clk;
943 int extif_mem_div;
944 struct omapfb_platform_data *omapfb_conf;
945 struct hwa742_platform_data *ctrl_conf;
946
947 BUG_ON(!fbdev->ext_if || !fbdev->int_ctrl);
948
949 hwa742.fbdev = fbdev;
950 hwa742.extif = fbdev->ext_if;
951 hwa742.int_ctrl = fbdev->int_ctrl;
952
953 omapfb_conf = fbdev->dev->platform_data;
954 ctrl_conf = omapfb_conf->ctrl_platform_data;
955
956 if (ctrl_conf == NULL) {
957 dev_err(fbdev->dev, "HWA742: missing platform data\n");
958 r = -ENOENT;
959 goto err1;
960 }
961
962 hwa742.sys_ck = clk_get(NULL, "hwa_sys_ck");
963
964 spin_lock_init(&hwa742.req_lock);
965
966 if ((r = hwa742.int_ctrl->init(fbdev, 1, req_vram)) < 0)
967 goto err1;
968
969 if ((r = hwa742.extif->init(fbdev)) < 0)
970 goto err2;
971
972 ext_clk = clk_get_rate(hwa742.sys_ck);
973 if ((r = calc_extif_timings(ext_clk, &extif_mem_div)) < 0)
974 goto err3;
975 hwa742.extif->set_timings(&hwa742.reg_timings);
976 clk_enable(hwa742.sys_ck);
977
978 calc_hwa742_clk_rates(ext_clk, &sys_clk, &pix_clk);
979 if ((r = calc_extif_timings(sys_clk, &extif_mem_div)) < 0)
980 goto err4;
981 hwa742.extif->set_timings(&hwa742.reg_timings);
982
983 rev = hwa742_read_reg(HWA742_REV_CODE_REG);
984 if ((rev & 0xfc) != 0x80) {
985 dev_err(fbdev->dev, "HWA742: invalid revision %02x\n", rev);
986 r = -ENODEV;
987 goto err4;
988 }
989
990
991 if (!(hwa742_read_reg(HWA742_PLL_DIV_REG) & 0x80)) {
992 dev_err(fbdev->dev,
993 "HWA742: controller not initialized by the bootloader\n");
994 r = -ENODEV;
995 goto err4;
996 }
997
998 if (ctrl_conf->te_connected) {
999 if ((r = setup_tearsync(pix_clk, extif_mem_div)) < 0) {
1000 dev_err(hwa742.fbdev->dev,
1001 "HWA742: can't setup tearing synchronization\n");
1002 goto err4;
1003 }
1004 hwa742.te_connected = 1;
1005 }
1006
1007 hwa742.max_transmit_size = hwa742.extif->max_transmit_size;
1008
1009 hwa742.update_mode = OMAPFB_UPDATE_DISABLED;
1010
1011 hwa742.auto_update_window.x = 0;
1012 hwa742.auto_update_window.y = 0;
1013 hwa742.auto_update_window.width = fbdev->panel->x_res;
1014 hwa742.auto_update_window.height = fbdev->panel->y_res;
1015 hwa742.auto_update_window.format = 0;
1016
1017 init_timer(&hwa742.auto_update_timer);
1018 hwa742.auto_update_timer.function = hwa742_update_window_auto;
1019 hwa742.auto_update_timer.data = 0;
1020
1021 hwa742.prev_color_mode = -1;
1022 hwa742.prev_flags = 0;
1023
1024 hwa742.fbdev = fbdev;
1025
1026 INIT_LIST_HEAD(&hwa742.free_req_list);
1027 INIT_LIST_HEAD(&hwa742.pending_req_list);
1028 for (i = 0; i < ARRAY_SIZE(hwa742.req_pool); i++)
1029 list_add(&hwa742.req_pool[i].entry, &hwa742.free_req_list);
1030 BUG_ON(i <= IRQ_REQ_POOL_SIZE);
1031 sema_init(&hwa742.req_sema, i - IRQ_REQ_POOL_SIZE);
1032
1033 conf = hwa742_read_reg(HWA742_CONFIG_REG);
1034 dev_info(fbdev->dev, ": Epson HWA742 LCD controller rev %d "
1035 "initialized (CNF pins %x)\n", rev & 0x03, conf & 0x07);
1036
1037 return 0;
1038 err4:
1039 clk_disable(hwa742.sys_ck);
1040 err3:
1041 hwa742.extif->cleanup();
1042 err2:
1043 hwa742.int_ctrl->cleanup();
1044 err1:
1045 return r;
1046 }
1047
1048 static void hwa742_cleanup(void)
1049 {
1050 hwa742_set_update_mode(OMAPFB_UPDATE_DISABLED);
1051 hwa742.extif->cleanup();
1052 hwa742.int_ctrl->cleanup();
1053 clk_disable(hwa742.sys_ck);
1054 }
1055
1056 struct lcd_ctrl hwa742_ctrl = {
1057 .name = "hwa742",
1058 .init = hwa742_init,
1059 .cleanup = hwa742_cleanup,
1060 .bind_client = hwa742_bind_client,
1061 .get_caps = hwa742_get_caps,
1062 .set_update_mode = hwa742_set_update_mode,
1063 .get_update_mode = hwa742_get_update_mode,
1064 .setup_plane = hwa742_setup_plane,
1065 .enable_plane = hwa742_enable_plane,
1066 .update_window = hwa742_update_window_async,
1067 .sync = hwa742_sync,
1068 .suspend = hwa742_suspend,
1069 .resume = hwa742_resume,
1070 };
1071
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree