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sysctl: restrict write access to dmesg_restrict
[linux/fpc-iii.git] / drivers / video / da8xx-fb.c
blob8d61ef96eedd5b7942346950223513eaf4ed52e9
1 /*
2 * Copyright (C) 2008-2009 MontaVista Software Inc.
3 * Copyright (C) 2008-2009 Texas Instruments Inc
4 *
5 * Based on the LCD driver for TI Avalanche processors written by
6 * Ajay Singh and Shalom Hai.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option)any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/fb.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/device.h>
27 #include <linux/platform_device.h>
28 #include <linux/uaccess.h>
29 #include <linux/interrupt.h>
30 #include <linux/clk.h>
31 #include <linux/cpufreq.h>
32 #include <linux/console.h>
33 #include <linux/slab.h>
34 #include <video/da8xx-fb.h>
35
36 #define DRIVER_NAME "da8xx_lcdc"
37
38 /* LCD Status Register */
39 #define LCD_END_OF_FRAME1 BIT(9)
40 #define LCD_END_OF_FRAME0 BIT(8)
41 #define LCD_PL_LOAD_DONE BIT(6)
42 #define LCD_FIFO_UNDERFLOW BIT(5)
43 #define LCD_SYNC_LOST BIT(2)
44
45 /* LCD DMA Control Register */
46 #define LCD_DMA_BURST_SIZE(x) ((x) << 4)
47 #define LCD_DMA_BURST_1 0x0
48 #define LCD_DMA_BURST_2 0x1
49 #define LCD_DMA_BURST_4 0x2
50 #define LCD_DMA_BURST_8 0x3
51 #define LCD_DMA_BURST_16 0x4
52 #define LCD_END_OF_FRAME_INT_ENA BIT(2)
53 #define LCD_DUAL_FRAME_BUFFER_ENABLE BIT(0)
54
55 /* LCD Control Register */
56 #define LCD_CLK_DIVISOR(x) ((x) << 8)
57 #define LCD_RASTER_MODE 0x01
58
59 /* LCD Raster Control Register */
60 #define LCD_PALETTE_LOAD_MODE(x) ((x) << 20)
61 #define PALETTE_AND_DATA 0x00
62 #define PALETTE_ONLY 0x01
63 #define DATA_ONLY 0x02
64
65 #define LCD_MONO_8BIT_MODE BIT(9)
66 #define LCD_RASTER_ORDER BIT(8)
67 #define LCD_TFT_MODE BIT(7)
68 #define LCD_UNDERFLOW_INT_ENA BIT(6)
69 #define LCD_PL_ENABLE BIT(4)
70 #define LCD_MONOCHROME_MODE BIT(1)
71 #define LCD_RASTER_ENABLE BIT(0)
72 #define LCD_TFT_ALT_ENABLE BIT(23)
73 #define LCD_STN_565_ENABLE BIT(24)
74
75 /* LCD Raster Timing 2 Register */
76 #define LCD_AC_BIAS_TRANSITIONS_PER_INT(x) ((x) << 16)
77 #define LCD_AC_BIAS_FREQUENCY(x) ((x) << 8)
78 #define LCD_SYNC_CTRL BIT(25)
79 #define LCD_SYNC_EDGE BIT(24)
80 #define LCD_INVERT_PIXEL_CLOCK BIT(22)
81 #define LCD_INVERT_LINE_CLOCK BIT(21)
82 #define LCD_INVERT_FRAME_CLOCK BIT(20)
83
84 /* LCD Block */
85 #define LCD_CTRL_REG 0x4
86 #define LCD_STAT_REG 0x8
87 #define LCD_RASTER_CTRL_REG 0x28
88 #define LCD_RASTER_TIMING_0_REG 0x2C
89 #define LCD_RASTER_TIMING_1_REG 0x30
90 #define LCD_RASTER_TIMING_2_REG 0x34
91 #define LCD_DMA_CTRL_REG 0x40
92 #define LCD_DMA_FRM_BUF_BASE_ADDR_0_REG 0x44
93 #define LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG 0x48
94 #define LCD_DMA_FRM_BUF_BASE_ADDR_1_REG 0x4C
95 #define LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG 0x50
96
97 #define LCD_NUM_BUFFERS 2
98
99 #define WSI_TIMEOUT 50
100 #define PALETTE_SIZE 256
101 #define LEFT_MARGIN 64
102 #define RIGHT_MARGIN 64
103 #define UPPER_MARGIN 32
104 #define LOWER_MARGIN 32
105
106 static resource_size_t da8xx_fb_reg_base;
107 static struct resource *lcdc_regs;
108
109 static inline unsigned int lcdc_read(unsigned int addr)
110 {
111 return (unsigned int)__raw_readl(da8xx_fb_reg_base + (addr));
112 }
113
114 static inline void lcdc_write(unsigned int val, unsigned int addr)
115 {
116 __raw_writel(val, da8xx_fb_reg_base + (addr));
117 }
118
119 struct da8xx_fb_par {
120 resource_size_t p_palette_base;
121 unsigned char *v_palette_base;
122 dma_addr_t vram_phys;
123 unsigned long vram_size;
124 void *vram_virt;
125 unsigned int dma_start;
126 unsigned int dma_end;
127 struct clk *lcdc_clk;
128 int irq;
129 unsigned short pseudo_palette[16];
130 unsigned int palette_sz;
131 unsigned int pxl_clk;
132 int blank;
133 wait_queue_head_t vsync_wait;
134 int vsync_flag;
135 int vsync_timeout;
136 #ifdef CONFIG_CPU_FREQ
137 struct notifier_block freq_transition;
138 #endif
139 void (*panel_power_ctrl)(int);
140 };
141
142 /* Variable Screen Information */
143 static struct fb_var_screeninfo da8xx_fb_var __devinitdata = {
144 .xoffset = 0,
145 .yoffset = 0,
146 .transp = {0, 0, 0},
147 .nonstd = 0,
148 .activate = 0,
149 .height = -1,
150 .width = -1,
151 .pixclock = 46666, /* 46us - AUO display */
152 .accel_flags = 0,
153 .left_margin = LEFT_MARGIN,
154 .right_margin = RIGHT_MARGIN,
155 .upper_margin = UPPER_MARGIN,
156 .lower_margin = LOWER_MARGIN,
157 .sync = 0,
158 .vmode = FB_VMODE_NONINTERLACED
159 };
160
161 static struct fb_fix_screeninfo da8xx_fb_fix __devinitdata = {
162 .id = "DA8xx FB Drv",
163 .type = FB_TYPE_PACKED_PIXELS,
164 .type_aux = 0,
165 .visual = FB_VISUAL_PSEUDOCOLOR,
166 .xpanstep = 0,
167 .ypanstep = 1,
168 .ywrapstep = 0,
169 .accel = FB_ACCEL_NONE
170 };
171
172 struct da8xx_panel {
173 const char name[25]; /* Full name <vendor>_<model> */
174 unsigned short width;
175 unsigned short height;
176 int hfp; /* Horizontal front porch */
177 int hbp; /* Horizontal back porch */
178 int hsw; /* Horizontal Sync Pulse Width */
179 int vfp; /* Vertical front porch */
180 int vbp; /* Vertical back porch */
181 int vsw; /* Vertical Sync Pulse Width */
182 unsigned int pxl_clk; /* Pixel clock */
183 unsigned char invert_pxl_clk; /* Invert Pixel clock */
184 };
185
186 static struct da8xx_panel known_lcd_panels[] = {
187 /* Sharp LCD035Q3DG01 */
188 [0] = {
189 .name = "Sharp_LCD035Q3DG01",
190 .width = 320,
191 .height = 240,
192 .hfp = 8,
193 .hbp = 6,
194 .hsw = 0,
195 .vfp = 2,
196 .vbp = 2,
197 .vsw = 0,
198 .pxl_clk = 4608000,
199 .invert_pxl_clk = 1,
200 },
201 /* Sharp LK043T1DG01 */
202 [1] = {
203 .name = "Sharp_LK043T1DG01",
204 .width = 480,
205 .height = 272,
206 .hfp = 2,
207 .hbp = 2,
208 .hsw = 41,
209 .vfp = 2,
210 .vbp = 2,
211 .vsw = 10,
212 .pxl_clk = 7833600,
213 .invert_pxl_clk = 0,
214 },
215 };
216
217 /* Enable the Raster Engine of the LCD Controller */
218 static inline void lcd_enable_raster(void)
219 {
220 u32 reg;
221
222 reg = lcdc_read(LCD_RASTER_CTRL_REG);
223 if (!(reg & LCD_RASTER_ENABLE))
224 lcdc_write(reg | LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
225 }
226
227 /* Disable the Raster Engine of the LCD Controller */
228 static inline void lcd_disable_raster(void)
229 {
230 u32 reg;
231
232 reg = lcdc_read(LCD_RASTER_CTRL_REG);
233 if (reg & LCD_RASTER_ENABLE)
234 lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
235 }
236
237 static void lcd_blit(int load_mode, struct da8xx_fb_par *par)
238 {
239 u32 start;
240 u32 end;
241 u32 reg_ras;
242 u32 reg_dma;
243
244 /* init reg to clear PLM (loading mode) fields */
245 reg_ras = lcdc_read(LCD_RASTER_CTRL_REG);
246 reg_ras &= ~(3 << 20);
247
248 reg_dma = lcdc_read(LCD_DMA_CTRL_REG);
249
250 if (load_mode == LOAD_DATA) {
251 start = par->dma_start;
252 end = par->dma_end;
253
254 reg_ras |= LCD_PALETTE_LOAD_MODE(DATA_ONLY);
255 reg_dma |= LCD_END_OF_FRAME_INT_ENA;
256 reg_dma |= LCD_DUAL_FRAME_BUFFER_ENABLE;
257
258 lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
259 lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
260 lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
261 lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
262 } else if (load_mode == LOAD_PALETTE) {
263 start = par->p_palette_base;
264 end = start + par->palette_sz - 1;
265
266 reg_ras |= LCD_PALETTE_LOAD_MODE(PALETTE_ONLY);
267 reg_ras |= LCD_PL_ENABLE;
268
269 lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
270 lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
271 }
272
273 lcdc_write(reg_dma, LCD_DMA_CTRL_REG);
274 lcdc_write(reg_ras, LCD_RASTER_CTRL_REG);
275
276 /*
277 * The Raster enable bit must be set after all other control fields are
278 * set.
279 */
280 lcd_enable_raster();
281 }
282
283 /* Configure the Burst Size of DMA */
284 static int lcd_cfg_dma(int burst_size)
285 {
286 u32 reg;
287
288 reg = lcdc_read(LCD_DMA_CTRL_REG) & 0x00000001;
289 switch (burst_size) {
290 case 1:
291 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_1);
292 break;
293 case 2:
294 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_2);
295 break;
296 case 4:
297 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_4);
298 break;
299 case 8:
300 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_8);
301 break;
302 case 16:
303 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);
304 break;
305 default:
306 return -EINVAL;
307 }
308 lcdc_write(reg, LCD_DMA_CTRL_REG);
309
310 return 0;
311 }
312
313 static void lcd_cfg_ac_bias(int period, int transitions_per_int)
314 {
315 u32 reg;
316
317 /* Set the AC Bias Period and Number of Transisitons per Interrupt */
318 reg = lcdc_read(LCD_RASTER_TIMING_2_REG) & 0xFFF00000;
319 reg |= LCD_AC_BIAS_FREQUENCY(period) |
320 LCD_AC_BIAS_TRANSITIONS_PER_INT(transitions_per_int);
321 lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
322 }
323
324 static void lcd_cfg_horizontal_sync(int back_porch, int pulse_width,
325 int front_porch)
326 {
327 u32 reg;
328
329 reg = lcdc_read(LCD_RASTER_TIMING_0_REG) & 0xf;
330 reg |= ((back_porch & 0xff) << 24)
331 | ((front_porch & 0xff) << 16)
332 | ((pulse_width & 0x3f) << 10);
333 lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
334 }
335
336 static void lcd_cfg_vertical_sync(int back_porch, int pulse_width,
337 int front_porch)
338 {
339 u32 reg;
340
341 reg = lcdc_read(LCD_RASTER_TIMING_1_REG) & 0x3ff;
342 reg |= ((back_porch & 0xff) << 24)
343 | ((front_porch & 0xff) << 16)
344 | ((pulse_width & 0x3f) << 10);
345 lcdc_write(reg, LCD_RASTER_TIMING_1_REG);
346 }
347
348 static int lcd_cfg_display(const struct lcd_ctrl_config *cfg)
349 {
350 u32 reg;
351
352 reg = lcdc_read(LCD_RASTER_CTRL_REG) & ~(LCD_TFT_MODE |
353 LCD_MONO_8BIT_MODE |
354 LCD_MONOCHROME_MODE);
355
356 switch (cfg->p_disp_panel->panel_shade) {
357 case MONOCHROME:
358 reg |= LCD_MONOCHROME_MODE;
359 if (cfg->mono_8bit_mode)
360 reg |= LCD_MONO_8BIT_MODE;
361 break;
362 case COLOR_ACTIVE:
363 reg |= LCD_TFT_MODE;
364 if (cfg->tft_alt_mode)
365 reg |= LCD_TFT_ALT_ENABLE;
366 break;
367
368 case COLOR_PASSIVE:
369 if (cfg->stn_565_mode)
370 reg |= LCD_STN_565_ENABLE;
371 break;
372
373 default:
374 return -EINVAL;
375 }
376
377 /* enable additional interrupts here */
378 reg |= LCD_UNDERFLOW_INT_ENA;
379
380 lcdc_write(reg, LCD_RASTER_CTRL_REG);
381
382 reg = lcdc_read(LCD_RASTER_TIMING_2_REG);
383
384 if (cfg->sync_ctrl)
385 reg |= LCD_SYNC_CTRL;
386 else
387 reg &= ~LCD_SYNC_CTRL;
388
389 if (cfg->sync_edge)
390 reg |= LCD_SYNC_EDGE;
391 else
392 reg &= ~LCD_SYNC_EDGE;
393
394 if (cfg->invert_line_clock)
395 reg |= LCD_INVERT_LINE_CLOCK;
396 else
397 reg &= ~LCD_INVERT_LINE_CLOCK;
398
399 if (cfg->invert_frm_clock)
400 reg |= LCD_INVERT_FRAME_CLOCK;
401 else
402 reg &= ~LCD_INVERT_FRAME_CLOCK;
403
404 lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
405
406 return 0;
407 }
408
409 static int lcd_cfg_frame_buffer(struct da8xx_fb_par *par, u32 width, u32 height,
410 u32 bpp, u32 raster_order)
411 {
412 u32 reg;
413
414 /* Set the Panel Width */
415 /* Pixels per line = (PPL + 1)*16 */
416 /*0x3F in bits 4..9 gives max horisontal resolution = 1024 pixels*/
417 width &= 0x3f0;
418 reg = lcdc_read(LCD_RASTER_TIMING_0_REG);
419 reg &= 0xfffffc00;
420 reg |= ((width >> 4) - 1) << 4;
421 lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
422
423 /* Set the Panel Height */
424 reg = lcdc_read(LCD_RASTER_TIMING_1_REG);
425 reg = ((height - 1) & 0x3ff) | (reg & 0xfffffc00);
426 lcdc_write(reg, LCD_RASTER_TIMING_1_REG);
427
428 /* Set the Raster Order of the Frame Buffer */
429 reg = lcdc_read(LCD_RASTER_CTRL_REG) & ~(1 << 8);
430 if (raster_order)
431 reg |= LCD_RASTER_ORDER;
432 lcdc_write(reg, LCD_RASTER_CTRL_REG);
433
434 switch (bpp) {
435 case 1:
436 case 2:
437 case 4:
438 case 16:
439 par->palette_sz = 16 * 2;
440 break;
441
442 case 8:
443 par->palette_sz = 256 * 2;
444 break;
445
446 default:
447 return -EINVAL;
448 }
449
450 return 0;
451 }
452
453 static int fb_setcolreg(unsigned regno, unsigned red, unsigned green,
454 unsigned blue, unsigned transp,
455 struct fb_info *info)
456 {
457 struct da8xx_fb_par *par = info->par;
458 unsigned short *palette = (unsigned short *) par->v_palette_base;
459 u_short pal;
460 int update_hw = 0;
461
462 if (regno > 255)
463 return 1;
464
465 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR)
466 return 1;
467
468 if (info->var.bits_per_pixel == 8) {
469 red >>= 4;
470 green >>= 8;
471 blue >>= 12;
472
473 pal = (red & 0x0f00);
474 pal |= (green & 0x00f0);
475 pal |= (blue & 0x000f);
476
477 if (palette[regno] != pal) {
478 update_hw = 1;
479 palette[regno] = pal;
480 }
481 } else if ((info->var.bits_per_pixel == 16) && regno < 16) {
482 red >>= (16 - info->var.red.length);
483 red <<= info->var.red.offset;
484
485 green >>= (16 - info->var.green.length);
486 green <<= info->var.green.offset;
487
488 blue >>= (16 - info->var.blue.length);
489 blue <<= info->var.blue.offset;
490
491 par->pseudo_palette[regno] = red | green | blue;
492
493 if (palette[0] != 0x4000) {
494 update_hw = 1;
495 palette[0] = 0x4000;
496 }
497 }
498
499 /* Update the palette in the h/w as needed. */
500 if (update_hw)
501 lcd_blit(LOAD_PALETTE, par);
502
503 return 0;
504 }
505
506 static void lcd_reset(struct da8xx_fb_par *par)
507 {
508 /* Disable the Raster if previously Enabled */
509 lcd_disable_raster();
510
511 /* DMA has to be disabled */
512 lcdc_write(0, LCD_DMA_CTRL_REG);
513 lcdc_write(0, LCD_RASTER_CTRL_REG);
514 }
515
516 static void lcd_calc_clk_divider(struct da8xx_fb_par *par)
517 {
518 unsigned int lcd_clk, div;
519
520 lcd_clk = clk_get_rate(par->lcdc_clk);
521 div = lcd_clk / par->pxl_clk;
522
523 /* Configure the LCD clock divisor. */
524 lcdc_write(LCD_CLK_DIVISOR(div) |
525 (LCD_RASTER_MODE & 0x1), LCD_CTRL_REG);
526 }
527
528 static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
529 struct da8xx_panel *panel)
530 {
531 u32 bpp;
532 int ret = 0;
533
534 lcd_reset(par);
535
536 /* Calculate the divider */
537 lcd_calc_clk_divider(par);
538
539 if (panel->invert_pxl_clk)
540 lcdc_write((lcdc_read(LCD_RASTER_TIMING_2_REG) |
541 LCD_INVERT_PIXEL_CLOCK), LCD_RASTER_TIMING_2_REG);
542 else
543 lcdc_write((lcdc_read(LCD_RASTER_TIMING_2_REG) &
544 ~LCD_INVERT_PIXEL_CLOCK), LCD_RASTER_TIMING_2_REG);
545
546 /* Configure the DMA burst size. */
547 ret = lcd_cfg_dma(cfg->dma_burst_sz);
548 if (ret < 0)
549 return ret;
550
551 /* Configure the AC bias properties. */
552 lcd_cfg_ac_bias(cfg->ac_bias, cfg->ac_bias_intrpt);
553
554 /* Configure the vertical and horizontal sync properties. */
555 lcd_cfg_vertical_sync(panel->vbp, panel->vsw, panel->vfp);
556 lcd_cfg_horizontal_sync(panel->hbp, panel->hsw, panel->hfp);
557
558 /* Configure for disply */
559 ret = lcd_cfg_display(cfg);
560 if (ret < 0)
561 return ret;
562
563 if (QVGA != cfg->p_disp_panel->panel_type)
564 return -EINVAL;
565
566 if (cfg->bpp <= cfg->p_disp_panel->max_bpp &&
567 cfg->bpp >= cfg->p_disp_panel->min_bpp)
568 bpp = cfg->bpp;
569 else
570 bpp = cfg->p_disp_panel->max_bpp;
571 if (bpp == 12)
572 bpp = 16;
573 ret = lcd_cfg_frame_buffer(par, (unsigned int)panel->width,
574 (unsigned int)panel->height, bpp,
575 cfg->raster_order);
576 if (ret < 0)
577 return ret;
578
579 /* Configure FDD */
580 lcdc_write((lcdc_read(LCD_RASTER_CTRL_REG) & 0xfff00fff) |
581 (cfg->fdd << 12), LCD_RASTER_CTRL_REG);
582
583 return 0;
584 }
585
586 static irqreturn_t lcdc_irq_handler(int irq, void *arg)
587 {
588 struct da8xx_fb_par *par = arg;
589 u32 stat = lcdc_read(LCD_STAT_REG);
590 u32 reg_ras;
591
592 if ((stat & LCD_SYNC_LOST) && (stat & LCD_FIFO_UNDERFLOW)) {
593 lcd_disable_raster();
594 lcdc_write(stat, LCD_STAT_REG);
595 lcd_enable_raster();
596 } else if (stat & LCD_PL_LOAD_DONE) {
597 /*
598 * Must disable raster before changing state of any control bit.
599 * And also must be disabled before clearing the PL loading
600 * interrupt via the following write to the status register. If
601 * this is done after then one gets multiple PL done interrupts.
602 */
603 lcd_disable_raster();
604
605 lcdc_write(stat, LCD_STAT_REG);
606
607 /* Disable PL completion inerrupt */
608 reg_ras = lcdc_read(LCD_RASTER_CTRL_REG);
609 reg_ras &= ~LCD_PL_ENABLE;
610 lcdc_write(reg_ras, LCD_RASTER_CTRL_REG);
611
612 /* Setup and start data loading mode */
613 lcd_blit(LOAD_DATA, par);
614 } else {
615 lcdc_write(stat, LCD_STAT_REG);
616
617 if (stat & LCD_END_OF_FRAME0) {
618 lcdc_write(par->dma_start,
619 LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
620 lcdc_write(par->dma_end,
621 LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
622 par->vsync_flag = 1;
623 wake_up_interruptible(&par->vsync_wait);
624 }
625
626 if (stat & LCD_END_OF_FRAME1) {
627 lcdc_write(par->dma_start,
628 LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
629 lcdc_write(par->dma_end,
630 LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
631 par->vsync_flag = 1;
632 wake_up_interruptible(&par->vsync_wait);
633 }
634 }
635
636 return IRQ_HANDLED;
637 }
638
639 static int fb_check_var(struct fb_var_screeninfo *var,
640 struct fb_info *info)
641 {
642 int err = 0;
643
644 switch (var->bits_per_pixel) {
645 case 1:
646 case 8:
647 var->red.offset = 0;
648 var->red.length = 8;
649 var->green.offset = 0;
650 var->green.length = 8;
651 var->blue.offset = 0;
652 var->blue.length = 8;
653 var->transp.offset = 0;
654 var->transp.length = 0;
655 break;
656 case 4:
657 var->red.offset = 0;
658 var->red.length = 4;
659 var->green.offset = 0;
660 var->green.length = 4;
661 var->blue.offset = 0;
662 var->blue.length = 4;
663 var->transp.offset = 0;
664 var->transp.length = 0;
665 break;
666 case 16: /* RGB 565 */
667 var->red.offset = 11;
668 var->red.length = 5;
669 var->green.offset = 5;
670 var->green.length = 6;
671 var->blue.offset = 0;
672 var->blue.length = 5;
673 var->transp.offset = 0;
674 var->transp.length = 0;
675 break;
676 default:
677 err = -EINVAL;
678 }
679
680 var->red.msb_right = 0;
681 var->green.msb_right = 0;
682 var->blue.msb_right = 0;
683 var->transp.msb_right = 0;
684 return err;
685 }
686
687 #ifdef CONFIG_CPU_FREQ
688 static int lcd_da8xx_cpufreq_transition(struct notifier_block *nb,
689 unsigned long val, void *data)
690 {
691 struct da8xx_fb_par *par;
692
693 par = container_of(nb, struct da8xx_fb_par, freq_transition);
694 if (val == CPUFREQ_PRECHANGE) {
695 lcd_disable_raster();
696 } else if (val == CPUFREQ_POSTCHANGE) {
697 lcd_calc_clk_divider(par);
698 lcd_enable_raster();
699 }
700
701 return 0;
702 }
703
704 static inline int lcd_da8xx_cpufreq_register(struct da8xx_fb_par *par)
705 {
706 par->freq_transition.notifier_call = lcd_da8xx_cpufreq_transition;
707
708 return cpufreq_register_notifier(&par->freq_transition,
709 CPUFREQ_TRANSITION_NOTIFIER);
710 }
711
712 static inline void lcd_da8xx_cpufreq_deregister(struct da8xx_fb_par *par)
713 {
714 cpufreq_unregister_notifier(&par->freq_transition,
715 CPUFREQ_TRANSITION_NOTIFIER);
716 }
717 #endif
718
719 static int __devexit fb_remove(struct platform_device *dev)
720 {
721 struct fb_info *info = dev_get_drvdata(&dev->dev);
722
723 if (info) {
724 struct da8xx_fb_par *par = info->par;
725
726 #ifdef CONFIG_CPU_FREQ
727 lcd_da8xx_cpufreq_deregister(par);
728 #endif
729 if (par->panel_power_ctrl)
730 par->panel_power_ctrl(0);
731
732 lcd_disable_raster();
733 lcdc_write(0, LCD_RASTER_CTRL_REG);
734
735 /* disable DMA */
736 lcdc_write(0, LCD_DMA_CTRL_REG);
737
738 unregister_framebuffer(info);
739 fb_dealloc_cmap(&info->cmap);
740 dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
741 par->p_palette_base);
742 dma_free_coherent(NULL, par->vram_size, par->vram_virt,
743 par->vram_phys);
744 free_irq(par->irq, par);
745 clk_disable(par->lcdc_clk);
746 clk_put(par->lcdc_clk);
747 framebuffer_release(info);
748 iounmap((void __iomem *)da8xx_fb_reg_base);
749 release_mem_region(lcdc_regs->start, resource_size(lcdc_regs));
750
751 }
752 return 0;
753 }
754
755 /*
756 * Function to wait for vertical sync which for this LCD peripheral
757 * translates into waiting for the current raster frame to complete.
758 */
759 static int fb_wait_for_vsync(struct fb_info *info)
760 {
761 struct da8xx_fb_par *par = info->par;
762 int ret;
763
764 /*
765 * Set flag to 0 and wait for isr to set to 1. It would seem there is a
766 * race condition here where the ISR could have occured just before or
767 * just after this set. But since we are just coarsely waiting for
768 * a frame to complete then that's OK. i.e. if the frame completed
769 * just before this code executed then we have to wait another full
770 * frame time but there is no way to avoid such a situation. On the
771 * other hand if the frame completed just after then we don't need
772 * to wait long at all. Either way we are guaranteed to return to the
773 * user immediately after a frame completion which is all that is
774 * required.
775 */
776 par->vsync_flag = 0;
777 ret = wait_event_interruptible_timeout(par->vsync_wait,
778 par->vsync_flag != 0,
779 par->vsync_timeout);
780 if (ret < 0)
781 return ret;
782 if (ret == 0)
783 return -ETIMEDOUT;
784
785 return 0;
786 }
787
788 static int fb_ioctl(struct fb_info *info, unsigned int cmd,
789 unsigned long arg)
790 {
791 struct lcd_sync_arg sync_arg;
792
793 switch (cmd) {
794 case FBIOGET_CONTRAST:
795 case FBIOPUT_CONTRAST:
796 case FBIGET_BRIGHTNESS:
797 case FBIPUT_BRIGHTNESS:
798 case FBIGET_COLOR:
799 case FBIPUT_COLOR:
800 return -ENOTTY;
801 case FBIPUT_HSYNC:
802 if (copy_from_user(&sync_arg, (char *)arg,
803 sizeof(struct lcd_sync_arg)))
804 return -EFAULT;
805 lcd_cfg_horizontal_sync(sync_arg.back_porch,
806 sync_arg.pulse_width,
807 sync_arg.front_porch);
808 break;
809 case FBIPUT_VSYNC:
810 if (copy_from_user(&sync_arg, (char *)arg,
811 sizeof(struct lcd_sync_arg)))
812 return -EFAULT;
813 lcd_cfg_vertical_sync(sync_arg.back_porch,
814 sync_arg.pulse_width,
815 sync_arg.front_porch);
816 break;
817 case FBIO_WAITFORVSYNC:
818 return fb_wait_for_vsync(info);
819 default:
820 return -EINVAL;
821 }
822 return 0;
823 }
824
825 static int cfb_blank(int blank, struct fb_info *info)
826 {
827 struct da8xx_fb_par *par = info->par;
828 int ret = 0;
829
830 if (par->blank == blank)
831 return 0;
832
833 par->blank = blank;
834 switch (blank) {
835 case FB_BLANK_UNBLANK:
836 if (par->panel_power_ctrl)
837 par->panel_power_ctrl(1);
838
839 lcd_enable_raster();
840 break;
841 case FB_BLANK_POWERDOWN:
842 if (par->panel_power_ctrl)
843 par->panel_power_ctrl(0);
844
845 lcd_disable_raster();
846 break;
847 default:
848 ret = -EINVAL;
849 }
850
851 return ret;
852 }
853
854 /*
855 * Set new x,y offsets in the virtual display for the visible area and switch
856 * to the new mode.
857 */
858 static int da8xx_pan_display(struct fb_var_screeninfo *var,
859 struct fb_info *fbi)
860 {
861 int ret = 0;
862 struct fb_var_screeninfo new_var;
863 struct da8xx_fb_par *par = fbi->par;
864 struct fb_fix_screeninfo *fix = &fbi->fix;
865 unsigned int end;
866 unsigned int start;
867
868 if (var->xoffset != fbi->var.xoffset ||
869 var->yoffset != fbi->var.yoffset) {
870 memcpy(&new_var, &fbi->var, sizeof(new_var));
871 new_var.xoffset = var->xoffset;
872 new_var.yoffset = var->yoffset;
873 if (fb_check_var(&new_var, fbi))
874 ret = -EINVAL;
875 else {
876 memcpy(&fbi->var, &new_var, sizeof(new_var));
877
878 start = fix->smem_start +
879 new_var.yoffset * fix->line_length +
880 new_var.xoffset * var->bits_per_pixel / 8;
881 end = start + var->yres * fix->line_length - 1;
882 par->dma_start = start;
883 par->dma_end = end;
884 }
885 }
886
887 return ret;
888 }
889
890 static struct fb_ops da8xx_fb_ops = {
891 .owner = THIS_MODULE,
892 .fb_check_var = fb_check_var,
893 .fb_setcolreg = fb_setcolreg,
894 .fb_pan_display = da8xx_pan_display,
895 .fb_ioctl = fb_ioctl,
896 .fb_fillrect = cfb_fillrect,
897 .fb_copyarea = cfb_copyarea,
898 .fb_imageblit = cfb_imageblit,
899 .fb_blank = cfb_blank,
900 };
901
902 static int __init fb_probe(struct platform_device *device)
903 {
904 struct da8xx_lcdc_platform_data *fb_pdata =
905 device->dev.platform_data;
906 struct lcd_ctrl_config *lcd_cfg;
907 struct da8xx_panel *lcdc_info;
908 struct fb_info *da8xx_fb_info;
909 struct clk *fb_clk = NULL;
910 struct da8xx_fb_par *par;
911 resource_size_t len;
912 int ret, i;
913
914 if (fb_pdata == NULL) {
915 dev_err(&device->dev, "Can not get platform data\n");
916 return -ENOENT;
917 }
918
919 lcdc_regs = platform_get_resource(device, IORESOURCE_MEM, 0);
920 if (!lcdc_regs) {
921 dev_err(&device->dev,
922 "Can not get memory resource for LCD controller\n");
923 return -ENOENT;
924 }
925
926 len = resource_size(lcdc_regs);
927
928 lcdc_regs = request_mem_region(lcdc_regs->start, len, lcdc_regs->name);
929 if (!lcdc_regs)
930 return -EBUSY;
931
932 da8xx_fb_reg_base = (resource_size_t)ioremap(lcdc_regs->start, len);
933 if (!da8xx_fb_reg_base) {
934 ret = -EBUSY;
935 goto err_request_mem;
936 }
937
938 fb_clk = clk_get(&device->dev, NULL);
939 if (IS_ERR(fb_clk)) {
940 dev_err(&device->dev, "Can not get device clock\n");
941 ret = -ENODEV;
942 goto err_ioremap;
943 }
944 ret = clk_enable(fb_clk);
945 if (ret)
946 goto err_clk_put;
947
948 for (i = 0, lcdc_info = known_lcd_panels;
949 i < ARRAY_SIZE(known_lcd_panels);
950 i++, lcdc_info++) {
951 if (strcmp(fb_pdata->type, lcdc_info->name) == 0)
952 break;
953 }
954
955 if (i == ARRAY_SIZE(known_lcd_panels)) {
956 dev_err(&device->dev, "GLCD: No valid panel found\n");
957 ret = -ENODEV;
958 goto err_clk_disable;
959 } else
960 dev_info(&device->dev, "GLCD: Found %s panel\n",
961 fb_pdata->type);
962
963 lcd_cfg = (struct lcd_ctrl_config *)fb_pdata->controller_data;
964
965 da8xx_fb_info = framebuffer_alloc(sizeof(struct da8xx_fb_par),
966 &device->dev);
967 if (!da8xx_fb_info) {
968 dev_dbg(&device->dev, "Memory allocation failed for fb_info\n");
969 ret = -ENOMEM;
970 goto err_clk_disable;
971 }
972
973 par = da8xx_fb_info->par;
974 par->lcdc_clk = fb_clk;
975 par->pxl_clk = lcdc_info->pxl_clk;
976 if (fb_pdata->panel_power_ctrl) {
977 par->panel_power_ctrl = fb_pdata->panel_power_ctrl;
978 par->panel_power_ctrl(1);
979 }
980
981 if (lcd_init(par, lcd_cfg, lcdc_info) < 0) {
982 dev_err(&device->dev, "lcd_init failed\n");
983 ret = -EFAULT;
984 goto err_release_fb;
985 }
986
987 /* allocate frame buffer */
988 par->vram_size = lcdc_info->width * lcdc_info->height * lcd_cfg->bpp;
989 par->vram_size = PAGE_ALIGN(par->vram_size/8);
990 par->vram_size = par->vram_size * LCD_NUM_BUFFERS;
991
992 par->vram_virt = dma_alloc_coherent(NULL,
993 par->vram_size,
994 (resource_size_t *) &par->vram_phys,
995 GFP_KERNEL | GFP_DMA);
996 if (!par->vram_virt) {
997 dev_err(&device->dev,
998 "GLCD: kmalloc for frame buffer failed\n");
999 ret = -EINVAL;
1000 goto err_release_fb;
1001 }
1002
1003 da8xx_fb_info->screen_base = (char __iomem *) par->vram_virt;
1004 da8xx_fb_fix.smem_start = par->vram_phys;
1005 da8xx_fb_fix.smem_len = par->vram_size;
1006 da8xx_fb_fix.line_length = (lcdc_info->width * lcd_cfg->bpp) / 8;
1007
1008 par->dma_start = par->vram_phys;
1009 par->dma_end = par->dma_start + lcdc_info->height *
1010 da8xx_fb_fix.line_length - 1;
1011
1012 /* allocate palette buffer */
1013 par->v_palette_base = dma_alloc_coherent(NULL,
1014 PALETTE_SIZE,
1015 (resource_size_t *)
1016 &par->p_palette_base,
1017 GFP_KERNEL | GFP_DMA);
1018 if (!par->v_palette_base) {
1019 dev_err(&device->dev,
1020 "GLCD: kmalloc for palette buffer failed\n");
1021 ret = -EINVAL;
1022 goto err_release_fb_mem;
1023 }
1024 memset(par->v_palette_base, 0, PALETTE_SIZE);
1025
1026 par->irq = platform_get_irq(device, 0);
1027 if (par->irq < 0) {
1028 ret = -ENOENT;
1029 goto err_release_pl_mem;
1030 }
1031
1032 /* Initialize par */
1033 da8xx_fb_info->var.bits_per_pixel = lcd_cfg->bpp;
1034
1035 da8xx_fb_var.xres = lcdc_info->width;
1036 da8xx_fb_var.xres_virtual = lcdc_info->width;
1037
1038 da8xx_fb_var.yres = lcdc_info->height;
1039 da8xx_fb_var.yres_virtual = lcdc_info->height * LCD_NUM_BUFFERS;
1040
1041 da8xx_fb_var.grayscale =
1042 lcd_cfg->p_disp_panel->panel_shade == MONOCHROME ? 1 : 0;
1043 da8xx_fb_var.bits_per_pixel = lcd_cfg->bpp;
1044
1045 da8xx_fb_var.hsync_len = lcdc_info->hsw;
1046 da8xx_fb_var.vsync_len = lcdc_info->vsw;
1047
1048 /* Initialize fbinfo */
1049 da8xx_fb_info->flags = FBINFO_FLAG_DEFAULT;
1050 da8xx_fb_info->fix = da8xx_fb_fix;
1051 da8xx_fb_info->var = da8xx_fb_var;
1052 da8xx_fb_info->fbops = &da8xx_fb_ops;
1053 da8xx_fb_info->pseudo_palette = par->pseudo_palette;
1054 da8xx_fb_info->fix.visual = (da8xx_fb_info->var.bits_per_pixel <= 8) ?
1055 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1056
1057 ret = fb_alloc_cmap(&da8xx_fb_info->cmap, PALETTE_SIZE, 0);
1058 if (ret)
1059 goto err_release_pl_mem;
1060 da8xx_fb_info->cmap.len = par->palette_sz;
1061
1062 /* initialize var_screeninfo */
1063 da8xx_fb_var.activate = FB_ACTIVATE_FORCE;
1064 fb_set_var(da8xx_fb_info, &da8xx_fb_var);
1065
1066 dev_set_drvdata(&device->dev, da8xx_fb_info);
1067
1068 /* initialize the vsync wait queue */
1069 init_waitqueue_head(&par->vsync_wait);
1070 par->vsync_timeout = HZ / 5;
1071
1072 /* Register the Frame Buffer */
1073 if (register_framebuffer(da8xx_fb_info) < 0) {
1074 dev_err(&device->dev,
1075 "GLCD: Frame Buffer Registration Failed!\n");
1076 ret = -EINVAL;
1077 goto err_dealloc_cmap;
1078 }
1079
1080 #ifdef CONFIG_CPU_FREQ
1081 ret = lcd_da8xx_cpufreq_register(par);
1082 if (ret) {
1083 dev_err(&device->dev, "failed to register cpufreq\n");
1084 goto err_cpu_freq;
1085 }
1086 #endif
1087
1088 ret = request_irq(par->irq, lcdc_irq_handler, 0, DRIVER_NAME, par);
1089 if (ret)
1090 goto irq_freq;
1091 return 0;
1092
1093 irq_freq:
1094 #ifdef CONFIG_CPU_FREQ
1095 lcd_da8xx_cpufreq_deregister(par);
1096 #endif
1097 err_cpu_freq:
1098 unregister_framebuffer(da8xx_fb_info);
1099
1100 err_dealloc_cmap:
1101 fb_dealloc_cmap(&da8xx_fb_info->cmap);
1102
1103 err_release_pl_mem:
1104 dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
1105 par->p_palette_base);
1106
1107 err_release_fb_mem:
1108 dma_free_coherent(NULL, par->vram_size, par->vram_virt, par->vram_phys);
1109
1110 err_release_fb:
1111 framebuffer_release(da8xx_fb_info);
1112
1113 err_clk_disable:
1114 clk_disable(fb_clk);
1115
1116 err_clk_put:
1117 clk_put(fb_clk);
1118
1119 err_ioremap:
1120 iounmap((void __iomem *)da8xx_fb_reg_base);
1121
1122 err_request_mem:
1123 release_mem_region(lcdc_regs->start, len);
1124
1125 return ret;
1126 }
1127
1128 #ifdef CONFIG_PM
1129 static int fb_suspend(struct platform_device *dev, pm_message_t state)
1130 {
1131 struct fb_info *info = platform_get_drvdata(dev);
1132 struct da8xx_fb_par *par = info->par;
1133
1134 console_lock();
1135 if (par->panel_power_ctrl)
1136 par->panel_power_ctrl(0);
1137
1138 fb_set_suspend(info, 1);
1139 lcd_disable_raster();
1140 clk_disable(par->lcdc_clk);
1141 console_unlock();
1142
1143 return 0;
1144 }
1145 static int fb_resume(struct platform_device *dev)
1146 {
1147 struct fb_info *info = platform_get_drvdata(dev);
1148 struct da8xx_fb_par *par = info->par;
1149
1150 console_lock();
1151 if (par->panel_power_ctrl)
1152 par->panel_power_ctrl(1);
1153
1154 clk_enable(par->lcdc_clk);
1155 lcd_enable_raster();
1156 fb_set_suspend(info, 0);
1157 console_unlock();
1158
1159 return 0;
1160 }
1161 #else
1162 #define fb_suspend NULL
1163 #define fb_resume NULL
1164 #endif
1165
1166 static struct platform_driver da8xx_fb_driver = {
1167 .probe = fb_probe,
1168 .remove = fb_remove,
1169 .suspend = fb_suspend,
1170 .resume = fb_resume,
1171 .driver = {
1172 .name = DRIVER_NAME,
1173 .owner = THIS_MODULE,
1174 },
1175 };
1176
1177 static int __init da8xx_fb_init(void)
1178 {
1179 return platform_driver_register(&da8xx_fb_driver);
1180 }
1181
1182 static void __exit da8xx_fb_cleanup(void)
1183 {
1184 platform_driver_unregister(&da8xx_fb_driver);
1185 }
1186
1187 module_init(da8xx_fb_init);
1188 module_exit(da8xx_fb_cleanup);
1189
1190 MODULE_DESCRIPTION("Framebuffer driver for TI da8xx/omap-l1xx");
1191 MODULE_AUTHOR("Texas Instruments");
1192 MODULE_LICENSE("GPL");
Linux with added FPC-III support