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perf buildid: Fix possible unterminated readlink() result buffer
[linux-2.6/linux-mips.git] / drivers / video / pxa168fb.c
blob18ead6f0184d136dcfc884e21db207748e18a0ef
1 /*
2 * linux/drivers/video/pxa168fb.c -- Marvell PXA168 LCD Controller
3 *
4 * Copyright (C) 2008 Marvell International Ltd.
5 * All rights reserved.
6 *
7 * 2009-02-16 adapted from original version for PXA168/910
8 * Jun Nie <njun@marvell.com>
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file COPYING in the main directory of this archive for
12 * more details.
13 */
14
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/string.h>
19 #include <linux/interrupt.h>
20 #include <linux/slab.h>
21 #include <linux/fb.h>
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/ioport.h>
25 #include <linux/platform_device.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/clk.h>
28 #include <linux/err.h>
29 #include <linux/uaccess.h>
30 #include <video/pxa168fb.h>
31
32 #include "pxa168fb.h"
33
34 #define DEFAULT_REFRESH 60 /* Hz */
35
36 static int determine_best_pix_fmt(struct fb_var_screeninfo *var)
37 {
38 /*
39 * Pseudocolor mode?
40 */
41 if (var->bits_per_pixel == 8)
42 return PIX_FMT_PSEUDOCOLOR;
43
44 /*
45 * Check for 565/1555.
46 */
47 if (var->bits_per_pixel == 16 && var->red.length <= 5 &&
48 var->green.length <= 6 && var->blue.length <= 5) {
49 if (var->transp.length == 0) {
50 if (var->red.offset >= var->blue.offset)
51 return PIX_FMT_RGB565;
52 else
53 return PIX_FMT_BGR565;
54 }
55
56 if (var->transp.length == 1 && var->green.length <= 5) {
57 if (var->red.offset >= var->blue.offset)
58 return PIX_FMT_RGB1555;
59 else
60 return PIX_FMT_BGR1555;
61 }
62
63 /* fall through */
64 }
65
66 /*
67 * Check for 888/A888.
68 */
69 if (var->bits_per_pixel <= 32 && var->red.length <= 8 &&
70 var->green.length <= 8 && var->blue.length <= 8) {
71 if (var->bits_per_pixel == 24 && var->transp.length == 0) {
72 if (var->red.offset >= var->blue.offset)
73 return PIX_FMT_RGB888PACK;
74 else
75 return PIX_FMT_BGR888PACK;
76 }
77
78 if (var->bits_per_pixel == 32 && var->transp.length == 8) {
79 if (var->red.offset >= var->blue.offset)
80 return PIX_FMT_RGBA888;
81 else
82 return PIX_FMT_BGRA888;
83 } else {
84 if (var->red.offset >= var->blue.offset)
85 return PIX_FMT_RGB888UNPACK;
86 else
87 return PIX_FMT_BGR888UNPACK;
88 }
89
90 /* fall through */
91 }
92
93 return -EINVAL;
94 }
95
96 static void set_pix_fmt(struct fb_var_screeninfo *var, int pix_fmt)
97 {
98 switch (pix_fmt) {
99 case PIX_FMT_RGB565:
100 var->bits_per_pixel = 16;
101 var->red.offset = 11; var->red.length = 5;
102 var->green.offset = 5; var->green.length = 6;
103 var->blue.offset = 0; var->blue.length = 5;
104 var->transp.offset = 0; var->transp.length = 0;
105 break;
106 case PIX_FMT_BGR565:
107 var->bits_per_pixel = 16;
108 var->red.offset = 0; var->red.length = 5;
109 var->green.offset = 5; var->green.length = 6;
110 var->blue.offset = 11; var->blue.length = 5;
111 var->transp.offset = 0; var->transp.length = 0;
112 break;
113 case PIX_FMT_RGB1555:
114 var->bits_per_pixel = 16;
115 var->red.offset = 10; var->red.length = 5;
116 var->green.offset = 5; var->green.length = 5;
117 var->blue.offset = 0; var->blue.length = 5;
118 var->transp.offset = 15; var->transp.length = 1;
119 break;
120 case PIX_FMT_BGR1555:
121 var->bits_per_pixel = 16;
122 var->red.offset = 0; var->red.length = 5;
123 var->green.offset = 5; var->green.length = 5;
124 var->blue.offset = 10; var->blue.length = 5;
125 var->transp.offset = 15; var->transp.length = 1;
126 break;
127 case PIX_FMT_RGB888PACK:
128 var->bits_per_pixel = 24;
129 var->red.offset = 16; var->red.length = 8;
130 var->green.offset = 8; var->green.length = 8;
131 var->blue.offset = 0; var->blue.length = 8;
132 var->transp.offset = 0; var->transp.length = 0;
133 break;
134 case PIX_FMT_BGR888PACK:
135 var->bits_per_pixel = 24;
136 var->red.offset = 0; var->red.length = 8;
137 var->green.offset = 8; var->green.length = 8;
138 var->blue.offset = 16; var->blue.length = 8;
139 var->transp.offset = 0; var->transp.length = 0;
140 break;
141 case PIX_FMT_RGBA888:
142 var->bits_per_pixel = 32;
143 var->red.offset = 16; var->red.length = 8;
144 var->green.offset = 8; var->green.length = 8;
145 var->blue.offset = 0; var->blue.length = 8;
146 var->transp.offset = 24; var->transp.length = 8;
147 break;
148 case PIX_FMT_BGRA888:
149 var->bits_per_pixel = 32;
150 var->red.offset = 0; var->red.length = 8;
151 var->green.offset = 8; var->green.length = 8;
152 var->blue.offset = 16; var->blue.length = 8;
153 var->transp.offset = 24; var->transp.length = 8;
154 break;
155 case PIX_FMT_PSEUDOCOLOR:
156 var->bits_per_pixel = 8;
157 var->red.offset = 0; var->red.length = 8;
158 var->green.offset = 0; var->green.length = 8;
159 var->blue.offset = 0; var->blue.length = 8;
160 var->transp.offset = 0; var->transp.length = 0;
161 break;
162 }
163 }
164
165 static void set_mode(struct pxa168fb_info *fbi, struct fb_var_screeninfo *var,
166 struct fb_videomode *mode, int pix_fmt, int ystretch)
167 {
168 struct fb_info *info = fbi->info;
169
170 set_pix_fmt(var, pix_fmt);
171
172 var->xres = mode->xres;
173 var->yres = mode->yres;
174 var->xres_virtual = max(var->xres, var->xres_virtual);
175 if (ystretch)
176 var->yres_virtual = info->fix.smem_len /
177 (var->xres_virtual * (var->bits_per_pixel >> 3));
178 else
179 var->yres_virtual = max(var->yres, var->yres_virtual);
180 var->grayscale = 0;
181 var->accel_flags = FB_ACCEL_NONE;
182 var->pixclock = mode->pixclock;
183 var->left_margin = mode->left_margin;
184 var->right_margin = mode->right_margin;
185 var->upper_margin = mode->upper_margin;
186 var->lower_margin = mode->lower_margin;
187 var->hsync_len = mode->hsync_len;
188 var->vsync_len = mode->vsync_len;
189 var->sync = mode->sync;
190 var->vmode = FB_VMODE_NONINTERLACED;
191 var->rotate = FB_ROTATE_UR;
192 }
193
194 static int pxa168fb_check_var(struct fb_var_screeninfo *var,
195 struct fb_info *info)
196 {
197 struct pxa168fb_info *fbi = info->par;
198 int pix_fmt;
199
200 /*
201 * Determine which pixel format we're going to use.
202 */
203 pix_fmt = determine_best_pix_fmt(var);
204 if (pix_fmt < 0)
205 return pix_fmt;
206 set_pix_fmt(var, pix_fmt);
207 fbi->pix_fmt = pix_fmt;
208
209 /*
210 * Basic geometry sanity checks.
211 */
212 if (var->xoffset + var->xres > var->xres_virtual)
213 return -EINVAL;
214 if (var->yoffset + var->yres > var->yres_virtual)
215 return -EINVAL;
216 if (var->xres + var->right_margin +
217 var->hsync_len + var->left_margin > 2048)
218 return -EINVAL;
219 if (var->yres + var->lower_margin +
220 var->vsync_len + var->upper_margin > 2048)
221 return -EINVAL;
222
223 /*
224 * Check size of framebuffer.
225 */
226 if (var->xres_virtual * var->yres_virtual *
227 (var->bits_per_pixel >> 3) > info->fix.smem_len)
228 return -EINVAL;
229
230 return 0;
231 }
232
233 /*
234 * The hardware clock divider has an integer and a fractional
235 * stage:
236 *
237 * clk2 = clk_in / integer_divider
238 * clk_out = clk2 * (1 - (fractional_divider >> 12))
239 *
240 * Calculate integer and fractional divider for given clk_in
241 * and clk_out.
242 */
243 static void set_clock_divider(struct pxa168fb_info *fbi,
244 const struct fb_videomode *m)
245 {
246 int divider_int;
247 int needed_pixclk;
248 u64 div_result;
249 u32 x = 0;
250
251 /*
252 * Notice: The field pixclock is used by linux fb
253 * is in pixel second. E.g. struct fb_videomode &
254 * struct fb_var_screeninfo
255 */
256
257 /*
258 * Check input values.
259 */
260 if (!m || !m->pixclock || !m->refresh) {
261 dev_err(fbi->dev, "Input refresh or pixclock is wrong.\n");
262 return;
263 }
264
265 /*
266 * Using PLL/AXI clock.
267 */
268 x = 0x80000000;
269
270 /*
271 * Calc divider according to refresh rate.
272 */
273 div_result = 1000000000000ll;
274 do_div(div_result, m->pixclock);
275 needed_pixclk = (u32)div_result;
276
277 divider_int = clk_get_rate(fbi->clk) / needed_pixclk;
278
279 /* check whether divisor is too small. */
280 if (divider_int < 2) {
281 dev_warn(fbi->dev, "Warning: clock source is too slow."
282 "Try smaller resolution\n");
283 divider_int = 2;
284 }
285
286 /*
287 * Set setting to reg.
288 */
289 x |= divider_int;
290 writel(x, fbi->reg_base + LCD_CFG_SCLK_DIV);
291 }
292
293 static void set_dma_control0(struct pxa168fb_info *fbi)
294 {
295 u32 x;
296
297 /*
298 * Set bit to enable graphics DMA.
299 */
300 x = readl(fbi->reg_base + LCD_SPU_DMA_CTRL0);
301 x &= ~CFG_GRA_ENA_MASK;
302 x |= fbi->active ? CFG_GRA_ENA(1) : CFG_GRA_ENA(0);
303
304 /*
305 * If we are in a pseudo-color mode, we need to enable
306 * palette lookup.
307 */
308 if (fbi->pix_fmt == PIX_FMT_PSEUDOCOLOR)
309 x |= 0x10000000;
310
311 /*
312 * Configure hardware pixel format.
313 */
314 x &= ~(0xF << 16);
315 x |= (fbi->pix_fmt >> 1) << 16;
316
317 /*
318 * Check red and blue pixel swap.
319 * 1. source data swap
320 * 2. panel output data swap
321 */
322 x &= ~(1 << 12);
323 x |= ((fbi->pix_fmt & 1) ^ (fbi->panel_rbswap)) << 12;
324
325 writel(x, fbi->reg_base + LCD_SPU_DMA_CTRL0);
326 }
327
328 static void set_dma_control1(struct pxa168fb_info *fbi, int sync)
329 {
330 u32 x;
331
332 /*
333 * Configure default bits: vsync triggers DMA, gated clock
334 * enable, power save enable, configure alpha registers to
335 * display 100% graphics, and set pixel command.
336 */
337 x = readl(fbi->reg_base + LCD_SPU_DMA_CTRL1);
338 x |= 0x2032ff81;
339
340 /*
341 * We trigger DMA on the falling edge of vsync if vsync is
342 * active low, or on the rising edge if vsync is active high.
343 */
344 if (!(sync & FB_SYNC_VERT_HIGH_ACT))
345 x |= 0x08000000;
346
347 writel(x, fbi->reg_base + LCD_SPU_DMA_CTRL1);
348 }
349
350 static void set_graphics_start(struct fb_info *info, int xoffset, int yoffset)
351 {
352 struct pxa168fb_info *fbi = info->par;
353 struct fb_var_screeninfo *var = &info->var;
354 int pixel_offset;
355 unsigned long addr;
356
357 pixel_offset = (yoffset * var->xres_virtual) + xoffset;
358
359 addr = fbi->fb_start_dma + (pixel_offset * (var->bits_per_pixel >> 3));
360 writel(addr, fbi->reg_base + LCD_CFG_GRA_START_ADDR0);
361 }
362
363 static void set_dumb_panel_control(struct fb_info *info)
364 {
365 struct pxa168fb_info *fbi = info->par;
366 struct pxa168fb_mach_info *mi = fbi->dev->platform_data;
367 u32 x;
368
369 /*
370 * Preserve enable flag.
371 */
372 x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL) & 0x00000001;
373
374 x |= (fbi->is_blanked ? 0x7 : mi->dumb_mode) << 28;
375 x |= mi->gpio_output_data << 20;
376 x |= mi->gpio_output_mask << 12;
377 x |= mi->panel_rgb_reverse_lanes ? 0x00000080 : 0;
378 x |= mi->invert_composite_blank ? 0x00000040 : 0;
379 x |= (info->var.sync & FB_SYNC_COMP_HIGH_ACT) ? 0x00000020 : 0;
380 x |= mi->invert_pix_val_ena ? 0x00000010 : 0;
381 x |= (info->var.sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 0x00000008;
382 x |= (info->var.sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 0x00000004;
383 x |= mi->invert_pixclock ? 0x00000002 : 0;
384
385 writel(x, fbi->reg_base + LCD_SPU_DUMB_CTRL);
386 }
387
388 static void set_dumb_screen_dimensions(struct fb_info *info)
389 {
390 struct pxa168fb_info *fbi = info->par;
391 struct fb_var_screeninfo *v = &info->var;
392 int x;
393 int y;
394
395 x = v->xres + v->right_margin + v->hsync_len + v->left_margin;
396 y = v->yres + v->lower_margin + v->vsync_len + v->upper_margin;
397
398 writel((y << 16) | x, fbi->reg_base + LCD_SPUT_V_H_TOTAL);
399 }
400
401 static int pxa168fb_set_par(struct fb_info *info)
402 {
403 struct pxa168fb_info *fbi = info->par;
404 struct fb_var_screeninfo *var = &info->var;
405 struct fb_videomode mode;
406 u32 x;
407 struct pxa168fb_mach_info *mi;
408
409 mi = fbi->dev->platform_data;
410
411 /*
412 * Set additional mode info.
413 */
414 if (fbi->pix_fmt == PIX_FMT_PSEUDOCOLOR)
415 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
416 else
417 info->fix.visual = FB_VISUAL_TRUECOLOR;
418 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
419 info->fix.ypanstep = var->yres;
420
421 /*
422 * Disable panel output while we setup the display.
423 */
424 x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL);
425 writel(x & ~1, fbi->reg_base + LCD_SPU_DUMB_CTRL);
426
427 /*
428 * Configure global panel parameters.
429 */
430 writel((var->yres << 16) | var->xres,
431 fbi->reg_base + LCD_SPU_V_H_ACTIVE);
432
433 /*
434 * convet var to video mode
435 */
436 fb_var_to_videomode(&mode, &info->var);
437
438 /* Calculate clock divisor. */
439 set_clock_divider(fbi, &mode);
440
441 /* Configure dma ctrl regs. */
442 set_dma_control0(fbi);
443 set_dma_control1(fbi, info->var.sync);
444
445 /*
446 * Configure graphics DMA parameters.
447 */
448 x = readl(fbi->reg_base + LCD_CFG_GRA_PITCH);
449 x = (x & ~0xFFFF) | ((var->xres_virtual * var->bits_per_pixel) >> 3);
450 writel(x, fbi->reg_base + LCD_CFG_GRA_PITCH);
451 writel((var->yres << 16) | var->xres,
452 fbi->reg_base + LCD_SPU_GRA_HPXL_VLN);
453 writel((var->yres << 16) | var->xres,
454 fbi->reg_base + LCD_SPU_GZM_HPXL_VLN);
455
456 /*
457 * Configure dumb panel ctrl regs & timings.
458 */
459 set_dumb_panel_control(info);
460 set_dumb_screen_dimensions(info);
461
462 writel((var->left_margin << 16) | var->right_margin,
463 fbi->reg_base + LCD_SPU_H_PORCH);
464 writel((var->upper_margin << 16) | var->lower_margin,
465 fbi->reg_base + LCD_SPU_V_PORCH);
466
467 /*
468 * Re-enable panel output.
469 */
470 x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL);
471 writel(x | 1, fbi->reg_base + LCD_SPU_DUMB_CTRL);
472
473 return 0;
474 }
475
476 static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
477 {
478 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
479 }
480
481 static u32 to_rgb(u16 red, u16 green, u16 blue)
482 {
483 red >>= 8;
484 green >>= 8;
485 blue >>= 8;
486
487 return (red << 16) | (green << 8) | blue;
488 }
489
490 static int
491 pxa168fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
492 unsigned int blue, unsigned int trans, struct fb_info *info)
493 {
494 struct pxa168fb_info *fbi = info->par;
495 u32 val;
496
497 if (info->var.grayscale)
498 red = green = blue = (19595 * red + 38470 * green +
499 7471 * blue) >> 16;
500
501 if (info->fix.visual == FB_VISUAL_TRUECOLOR && regno < 16) {
502 val = chan_to_field(red, &info->var.red);
503 val |= chan_to_field(green, &info->var.green);
504 val |= chan_to_field(blue , &info->var.blue);
505 fbi->pseudo_palette[regno] = val;
506 }
507
508 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
509 val = to_rgb(red, green, blue);
510 writel(val, fbi->reg_base + LCD_SPU_SRAM_WRDAT);
511 writel(0x8300 | regno, fbi->reg_base + LCD_SPU_SRAM_CTRL);
512 }
513
514 return 0;
515 }
516
517 static int pxa168fb_blank(int blank, struct fb_info *info)
518 {
519 struct pxa168fb_info *fbi = info->par;
520
521 fbi->is_blanked = (blank == FB_BLANK_UNBLANK) ? 0 : 1;
522 set_dumb_panel_control(info);
523
524 return 0;
525 }
526
527 static int pxa168fb_pan_display(struct fb_var_screeninfo *var,
528 struct fb_info *info)
529 {
530 set_graphics_start(info, var->xoffset, var->yoffset);
531
532 return 0;
533 }
534
535 static irqreturn_t pxa168fb_handle_irq(int irq, void *dev_id)
536 {
537 struct pxa168fb_info *fbi = dev_id;
538 u32 isr = readl(fbi->reg_base + SPU_IRQ_ISR);
539
540 if ((isr & GRA_FRAME_IRQ0_ENA_MASK)) {
541
542 writel(isr & (~GRA_FRAME_IRQ0_ENA_MASK),
543 fbi->reg_base + SPU_IRQ_ISR);
544
545 return IRQ_HANDLED;
546 }
547 return IRQ_NONE;
548 }
549
550 static struct fb_ops pxa168fb_ops = {
551 .owner = THIS_MODULE,
552 .fb_check_var = pxa168fb_check_var,
553 .fb_set_par = pxa168fb_set_par,
554 .fb_setcolreg = pxa168fb_setcolreg,
555 .fb_blank = pxa168fb_blank,
556 .fb_pan_display = pxa168fb_pan_display,
557 .fb_fillrect = cfb_fillrect,
558 .fb_copyarea = cfb_copyarea,
559 .fb_imageblit = cfb_imageblit,
560 };
561
562 static int __devinit pxa168fb_init_mode(struct fb_info *info,
563 struct pxa168fb_mach_info *mi)
564 {
565 struct pxa168fb_info *fbi = info->par;
566 struct fb_var_screeninfo *var = &info->var;
567 int ret = 0;
568 u32 total_w, total_h, refresh;
569 u64 div_result;
570 const struct fb_videomode *m;
571
572 /*
573 * Set default value
574 */
575 refresh = DEFAULT_REFRESH;
576
577 /* try to find best video mode. */
578 m = fb_find_best_mode(&info->var, &info->modelist);
579 if (m)
580 fb_videomode_to_var(&info->var, m);
581
582 /* Init settings. */
583 var->xres_virtual = var->xres;
584 var->yres_virtual = info->fix.smem_len /
585 (var->xres_virtual * (var->bits_per_pixel >> 3));
586 dev_dbg(fbi->dev, "pxa168fb: find best mode: res = %dx%d\n",
587 var->xres, var->yres);
588
589 /* correct pixclock. */
590 total_w = var->xres + var->left_margin + var->right_margin +
591 var->hsync_len;
592 total_h = var->yres + var->upper_margin + var->lower_margin +
593 var->vsync_len;
594
595 div_result = 1000000000000ll;
596 do_div(div_result, total_w * total_h * refresh);
597 var->pixclock = (u32)div_result;
598
599 return ret;
600 }
601
602 static int __devinit pxa168fb_probe(struct platform_device *pdev)
603 {
604 struct pxa168fb_mach_info *mi;
605 struct fb_info *info = 0;
606 struct pxa168fb_info *fbi = 0;
607 struct resource *res;
608 struct clk *clk;
609 int irq, ret;
610
611 mi = pdev->dev.platform_data;
612 if (mi == NULL) {
613 dev_err(&pdev->dev, "no platform data defined\n");
614 return -EINVAL;
615 }
616
617 clk = clk_get(&pdev->dev, "LCDCLK");
618 if (IS_ERR(clk)) {
619 dev_err(&pdev->dev, "unable to get LCDCLK");
620 return PTR_ERR(clk);
621 }
622
623 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
624 if (res == NULL) {
625 dev_err(&pdev->dev, "no IO memory defined\n");
626 ret = -ENOENT;
627 goto failed_put_clk;
628 }
629
630 irq = platform_get_irq(pdev, 0);
631 if (irq < 0) {
632 dev_err(&pdev->dev, "no IRQ defined\n");
633 ret = -ENOENT;
634 goto failed_put_clk;
635 }
636
637 info = framebuffer_alloc(sizeof(struct pxa168fb_info), &pdev->dev);
638 if (info == NULL) {
639 ret = -ENOMEM;
640 goto failed_put_clk;
641 }
642
643 /* Initialize private data */
644 fbi = info->par;
645 fbi->info = info;
646 fbi->clk = clk;
647 fbi->dev = info->dev = &pdev->dev;
648 fbi->panel_rbswap = mi->panel_rbswap;
649 fbi->is_blanked = 0;
650 fbi->active = mi->active;
651
652 /*
653 * Initialise static fb parameters.
654 */
655 info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK |
656 FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN;
657 info->node = -1;
658 strlcpy(info->fix.id, mi->id, 16);
659 info->fix.type = FB_TYPE_PACKED_PIXELS;
660 info->fix.type_aux = 0;
661 info->fix.xpanstep = 0;
662 info->fix.ypanstep = 0;
663 info->fix.ywrapstep = 0;
664 info->fix.mmio_start = res->start;
665 info->fix.mmio_len = resource_size(res);
666 info->fix.accel = FB_ACCEL_NONE;
667 info->fbops = &pxa168fb_ops;
668 info->pseudo_palette = fbi->pseudo_palette;
669
670 /*
671 * Map LCD controller registers.
672 */
673 fbi->reg_base = ioremap_nocache(res->start, resource_size(res));
674 if (fbi->reg_base == NULL) {
675 ret = -ENOMEM;
676 goto failed_free_info;
677 }
678
679 /*
680 * Allocate framebuffer memory.
681 */
682 info->fix.smem_len = PAGE_ALIGN(DEFAULT_FB_SIZE);
683
684 info->screen_base = dma_alloc_writecombine(fbi->dev, info->fix.smem_len,
685 &fbi->fb_start_dma, GFP_KERNEL);
686 if (info->screen_base == NULL) {
687 ret = -ENOMEM;
688 goto failed_free_info;
689 }
690
691 info->fix.smem_start = (unsigned long)fbi->fb_start_dma;
692 set_graphics_start(info, 0, 0);
693
694 /*
695 * Set video mode according to platform data.
696 */
697 set_mode(fbi, &info->var, mi->modes, mi->pix_fmt, 1);
698
699 fb_videomode_to_modelist(mi->modes, mi->num_modes, &info->modelist);
700
701 /*
702 * init video mode data.
703 */
704 pxa168fb_init_mode(info, mi);
705
706 /*
707 * Fill in sane defaults.
708 */
709 ret = pxa168fb_check_var(&info->var, info);
710 if (ret)
711 goto failed_free_fbmem;
712
713 /*
714 * enable controller clock
715 */
716 clk_enable(fbi->clk);
717
718 pxa168fb_set_par(info);
719
720 /*
721 * Configure default register values.
722 */
723 writel(0, fbi->reg_base + LCD_SPU_BLANKCOLOR);
724 writel(mi->io_pin_allocation_mode, fbi->reg_base + SPU_IOPAD_CONTROL);
725 writel(0, fbi->reg_base + LCD_CFG_GRA_START_ADDR1);
726 writel(0, fbi->reg_base + LCD_SPU_GRA_OVSA_HPXL_VLN);
727 writel(0, fbi->reg_base + LCD_SPU_SRAM_PARA0);
728 writel(CFG_CSB_256x32(0x1)|CFG_CSB_256x24(0x1)|CFG_CSB_256x8(0x1),
729 fbi->reg_base + LCD_SPU_SRAM_PARA1);
730
731 /*
732 * Allocate color map.
733 */
734 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
735 ret = -ENOMEM;
736 goto failed_free_clk;
737 }
738
739 /*
740 * Register irq handler.
741 */
742 ret = request_irq(irq, pxa168fb_handle_irq, IRQF_SHARED,
743 info->fix.id, fbi);
744 if (ret < 0) {
745 dev_err(&pdev->dev, "unable to request IRQ\n");
746 ret = -ENXIO;
747 goto failed_free_cmap;
748 }
749
750 /*
751 * Enable GFX interrupt
752 */
753 writel(GRA_FRAME_IRQ0_ENA(0x1), fbi->reg_base + SPU_IRQ_ENA);
754
755 /*
756 * Register framebuffer.
757 */
758 ret = register_framebuffer(info);
759 if (ret < 0) {
760 dev_err(&pdev->dev, "Failed to register pxa168-fb: %d\n", ret);
761 ret = -ENXIO;
762 goto failed_free_irq;
763 }
764
765 platform_set_drvdata(pdev, fbi);
766 return 0;
767
768 failed_free_irq:
769 free_irq(irq, fbi);
770 failed_free_cmap:
771 fb_dealloc_cmap(&info->cmap);
772 failed_free_clk:
773 clk_disable(fbi->clk);
774 failed_free_fbmem:
775 dma_free_coherent(fbi->dev, info->fix.smem_len,
776 info->screen_base, fbi->fb_start_dma);
777 failed_free_info:
778 kfree(info);
779 failed_put_clk:
780 clk_put(clk);
781
782 dev_err(&pdev->dev, "frame buffer device init failed with %d\n", ret);
783 return ret;
784 }
785
786 static int __devexit pxa168fb_remove(struct platform_device *pdev)
787 {
788 struct pxa168fb_info *fbi = platform_get_drvdata(pdev);
789 struct fb_info *info;
790 int irq;
791 unsigned int data;
792
793 if (!fbi)
794 return 0;
795
796 /* disable DMA transfer */
797 data = readl(fbi->reg_base + LCD_SPU_DMA_CTRL0);
798 data &= ~CFG_GRA_ENA_MASK;
799 writel(data, fbi->reg_base + LCD_SPU_DMA_CTRL0);
800
801 info = fbi->info;
802
803 unregister_framebuffer(info);
804
805 writel(GRA_FRAME_IRQ0_ENA(0x0), fbi->reg_base + SPU_IRQ_ENA);
806
807 if (info->cmap.len)
808 fb_dealloc_cmap(&info->cmap);
809
810 irq = platform_get_irq(pdev, 0);
811 free_irq(irq, fbi);
812
813 dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
814 info->screen_base, info->fix.smem_start);
815
816 iounmap(fbi->reg_base);
817
818 clk_disable(fbi->clk);
819 clk_put(fbi->clk);
820
821 framebuffer_release(info);
822
823 return 0;
824 }
825
826 static struct platform_driver pxa168fb_driver = {
827 .driver = {
828 .name = "pxa168-fb",
829 .owner = THIS_MODULE,
830 },
831 .probe = pxa168fb_probe,
832 .remove = __devexit_p(pxa168fb_remove),
833 };
834
835 static int __init pxa168fb_init(void)
836 {
837 return platform_driver_register(&pxa168fb_driver);
838 }
839 module_init(pxa168fb_init);
840
841 static void __exit pxa168fb_exit(void)
842 {
843 platform_driver_unregister(&pxa168fb_driver);
844 }
845 module_exit(pxa168fb_exit);
846
847 MODULE_AUTHOR("Lennert Buytenhek <buytenh@marvell.com> "
848 "Green Wan <gwan@marvell.com>");
849 MODULE_DESCRIPTION("Framebuffer driver for PXA168/910");
850 MODULE_LICENSE("GPL");
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