1 /*
2 * Freescale i.MX Frame Buffer device driver
3 *
4 * Copyright (C) 2004 Sascha Hauer, Pengutronix
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 * Please direct your questions and comments on this driver to the following
12 * email address:
13 *
14 * linux-arm-kernel@lists.arm.linux.org.uk
15 */
16
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/string.h>
21 #include <linux/interrupt.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/fb.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/ioport.h>
28 #include <linux/cpufreq.h>
29 #include <linux/clk.h>
30 #include <linux/platform_device.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/io.h>
33 #include <linux/math64.h>
34
35 #include <mach/imxfb.h>
36 #include <mach/hardware.h>
37
38 /*
39 * Complain if VAR is out of range.
40 */
41 #define DEBUG_VAR 1
42
43 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
44 (defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) && \
45 defined(CONFIG_FB_IMX_MODULE))
46 #define PWMR_BACKLIGHT_AVAILABLE
47 #endif
48
49 #define DRIVER_NAME "imx-fb"
50
51 #define LCDC_SSA 0x00
52
53 #define LCDC_SIZE 0x04
54 #define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20)
55
56 #define YMAX_MASK (cpu_is_mx1() ? 0x1ff : 0x3ff)
57 #define SIZE_YMAX(y) ((y) & YMAX_MASK)
58
59 #define LCDC_VPW 0x08
60 #define VPW_VPW(x) ((x) & 0x3ff)
61
62 #define LCDC_CPOS 0x0C
63 #define CPOS_CC1 (1<<31)
64 #define CPOS_CC0 (1<<30)
65 #define CPOS_OP (1<<28)
66 #define CPOS_CXP(x) (((x) & 3ff) << 16)
67
68 #define LCDC_LCWHB 0x10
69 #define LCWHB_BK_EN (1<<31)
70 #define LCWHB_CW(w) (((w) & 0x1f) << 24)
71 #define LCWHB_CH(h) (((h) & 0x1f) << 16)
72 #define LCWHB_BD(x) ((x) & 0xff)
73
74 #define LCDC_LCHCC 0x14
75
76 #define LCDC_PCR 0x18
77
78 #define LCDC_HCR 0x1C
79 #define HCR_H_WIDTH(x) (((x) & 0x3f) << 26)
80 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
81 #define HCR_H_WAIT_2(x) ((x) & 0xff)
82
83 #define LCDC_VCR 0x20
84 #define VCR_V_WIDTH(x) (((x) & 0x3f) << 26)
85 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
86 #define VCR_V_WAIT_2(x) ((x) & 0xff)
87
88 #define LCDC_POS 0x24
89 #define POS_POS(x) ((x) & 1f)
90
91 #define LCDC_LSCR1 0x28
92 /* bit fields in imxfb.h */
93
94 #define LCDC_PWMR 0x2C
95 /* bit fields in imxfb.h */
96
97 #define LCDC_DMACR 0x30
98 /* bit fields in imxfb.h */
99
100 #define LCDC_RMCR 0x34
101
102 #define RMCR_LCDC_EN_MX1 (1<<1)
103
104 #define RMCR_SELF_REF (1<<0)
105
106 #define LCDC_LCDICR 0x38
107 #define LCDICR_INT_SYN (1<<2)
108 #define LCDICR_INT_CON (1)
109
110 #define LCDC_LCDISR 0x40
111 #define LCDISR_UDR_ERR (1<<3)
112 #define LCDISR_ERR_RES (1<<2)
113 #define LCDISR_EOF (1<<1)
114 #define LCDISR_BOF (1<<0)
115
116 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
117 static const char *fb_mode;
118
119
120 /*
121 * These are the bitfields for each
122 * display depth that we support.
123 */
124 struct imxfb_rgb {
125 struct fb_bitfield red;
126 struct fb_bitfield green;
127 struct fb_bitfield blue;
128 struct fb_bitfield transp;
129 };
130
131 struct imxfb_info {
132 struct platform_device *pdev;
133 void __iomem *regs;
134 struct clk *clk;
135
136 /*
137 * These are the addresses we mapped
138 * the framebuffer memory region to.
139 */
140 dma_addr_t map_dma;
141 u_char *map_cpu;
142 u_int map_size;
143
144 u_char *screen_cpu;
145 dma_addr_t screen_dma;
146 u_int palette_size;
147
148 dma_addr_t dbar1;
149 dma_addr_t dbar2;
150
151 u_int pcr;
152 u_int pwmr;
153 u_int lscr1;
154 u_int dmacr;
155 u_int cmap_inverse:1,
156 cmap_static:1,
157 unused:30;
158
159 struct imx_fb_videomode *mode;
160 int num_modes;
161 #ifdef PWMR_BACKLIGHT_AVAILABLE
162 struct backlight_device *bl;
163 #endif
164
165 void (*lcd_power)(int);
166 void (*backlight_power)(int);
167 };
168
169 #define IMX_NAME "IMX"
170
171 /*
172 * Minimum X and Y resolutions
173 */
174 #define MIN_XRES 64
175 #define MIN_YRES 64
176
177 /* Actually this really is 18bit support, the lowest 2 bits of each colour
178 * are unused in hardware. We claim to have 24bit support to make software
179 * like X work, which does not support 18bit.
180 */
181 static struct imxfb_rgb def_rgb_18 = {
182 .red = {.offset = 16, .length = 8,},
183 .green = {.offset = 8, .length = 8,},
184 .blue = {.offset = 0, .length = 8,},
185 .transp = {.offset = 0, .length = 0,},
186 };
187
188 static struct imxfb_rgb def_rgb_16_tft = {
189 .red = {.offset = 11, .length = 5,},
190 .green = {.offset = 5, .length = 6,},
191 .blue = {.offset = 0, .length = 5,},
192 .transp = {.offset = 0, .length = 0,},
193 };
194
195 static struct imxfb_rgb def_rgb_16_stn = {
196 .red = {.offset = 8, .length = 4,},
197 .green = {.offset = 4, .length = 4,},
198 .blue = {.offset = 0, .length = 4,},
199 .transp = {.offset = 0, .length = 0,},
200 };
201
202 static struct imxfb_rgb def_rgb_8 = {
203 .red = {.offset = 0, .length = 8,},
204 .green = {.offset = 0, .length = 8,},
205 .blue = {.offset = 0, .length = 8,},
206 .transp = {.offset = 0, .length = 0,},
207 };
208
209 static int imxfb_activate_var(struct fb_var_screeninfo *var,
210 struct fb_info *info);
211
chan_to_field(u_int chan,struct fb_bitfield * bf)212 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
213 {
214 chan &= 0xffff;
215 chan >>= 16 - bf->length;
216 return chan << bf->offset;
217 }
218
imxfb_setpalettereg(u_int regno,u_int red,u_int green,u_int blue,u_int trans,struct fb_info * info)219 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
220 u_int trans, struct fb_info *info)
221 {
222 struct imxfb_info *fbi = info->par;
223 u_int val, ret = 1;
224
225 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
226 if (regno < fbi->palette_size) {
227 val = (CNVT_TOHW(red, 4) << 8) |
228 (CNVT_TOHW(green,4) << 4) |
229 CNVT_TOHW(blue, 4);
230
231 writel(val, fbi->regs + 0x800 + (regno << 2));
232 ret = 0;
233 }
234 return ret;
235 }
236
imxfb_setcolreg(u_int regno,u_int red,u_int green,u_int blue,u_int trans,struct fb_info * info)237 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
238 u_int trans, struct fb_info *info)
239 {
240 struct imxfb_info *fbi = info->par;
241 unsigned int val;
242 int ret = 1;
243
244 /*
245 * If inverse mode was selected, invert all the colours
246 * rather than the register number. The register number
247 * is what you poke into the framebuffer to produce the
248 * colour you requested.
249 */
250 if (fbi->cmap_inverse) {
251 red = 0xffff - red;
252 green = 0xffff - green;
253 blue = 0xffff - blue;
254 }
255
256 /*
257 * If greyscale is true, then we convert the RGB value
258 * to greyscale no mater what visual we are using.
259 */
260 if (info->var.grayscale)
261 red = green = blue = (19595 * red + 38470 * green +
262 7471 * blue) >> 16;
263
264 switch (info->fix.visual) {
265 case FB_VISUAL_TRUECOLOR:
266 /*
267 * 12 or 16-bit True Colour. We encode the RGB value
268 * according to the RGB bitfield information.
269 */
270 if (regno < 16) {
271 u32 *pal = info->pseudo_palette;
272
273 val = chan_to_field(red, &info->var.red);
274 val |= chan_to_field(green, &info->var.green);
275 val |= chan_to_field(blue, &info->var.blue);
276
277 pal[regno] = val;
278 ret = 0;
279 }
280 break;
281
282 case FB_VISUAL_STATIC_PSEUDOCOLOR:
283 case FB_VISUAL_PSEUDOCOLOR:
284 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
285 break;
286 }
287
288 return ret;
289 }
290
imxfb_find_mode(struct imxfb_info * fbi)291 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
292 {
293 struct imx_fb_videomode *m;
294 int i;
295
296 for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
297 if (!strcmp(m->mode.name, fb_mode))
298 return m;
299 }
300 return NULL;
301 }
302
303 /*
304 * imxfb_check_var():
305 * Round up in the following order: bits_per_pixel, xres,
306 * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
307 * bitfields, horizontal timing, vertical timing.
308 */
imxfb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)309 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
310 {
311 struct imxfb_info *fbi = info->par;
312 struct imxfb_rgb *rgb;
313 const struct imx_fb_videomode *imxfb_mode;
314 unsigned long lcd_clk;
315 unsigned long long tmp;
316 u32 pcr = 0;
317
318 if (var->xres < MIN_XRES)
319 var->xres = MIN_XRES;
320 if (var->yres < MIN_YRES)
321 var->yres = MIN_YRES;
322
323 imxfb_mode = imxfb_find_mode(fbi);
324 if (!imxfb_mode)
325 return -EINVAL;
326
327 var->xres = imxfb_mode->mode.xres;
328 var->yres = imxfb_mode->mode.yres;
329 var->bits_per_pixel = imxfb_mode->bpp;
330 var->pixclock = imxfb_mode->mode.pixclock;
331 var->hsync_len = imxfb_mode->mode.hsync_len;
332 var->left_margin = imxfb_mode->mode.left_margin;
333 var->right_margin = imxfb_mode->mode.right_margin;
334 var->vsync_len = imxfb_mode->mode.vsync_len;
335 var->upper_margin = imxfb_mode->mode.upper_margin;
336 var->lower_margin = imxfb_mode->mode.lower_margin;
337 var->sync = imxfb_mode->mode.sync;
338 var->xres_virtual = max(var->xres_virtual, var->xres);
339 var->yres_virtual = max(var->yres_virtual, var->yres);
340
341 pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
342
343 lcd_clk = clk_get_rate(fbi->clk);
344
345 tmp = var->pixclock * (unsigned long long)lcd_clk;
346
347 do_div(tmp, 1000000);
348
349 if (do_div(tmp, 1000000) > 500000)
350 tmp++;
351
352 pcr = (unsigned int)tmp;
353
354 if (--pcr > 0x3F) {
355 pcr = 0x3F;
356 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
357 lcd_clk / pcr);
358 }
359
360 switch (var->bits_per_pixel) {
361 case 32:
362 pcr |= PCR_BPIX_18;
363 rgb = &def_rgb_18;
364 break;
365 case 16:
366 default:
367 if (cpu_is_mx1())
368 pcr |= PCR_BPIX_12;
369 else
370 pcr |= PCR_BPIX_16;
371
372 if (imxfb_mode->pcr & PCR_TFT)
373 rgb = &def_rgb_16_tft;
374 else
375 rgb = &def_rgb_16_stn;
376 break;
377 case 8:
378 pcr |= PCR_BPIX_8;
379 rgb = &def_rgb_8;
380 break;
381 }
382
383 /* add sync polarities */
384 pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
385
386 fbi->pcr = pcr;
387
388 /*
389 * Copy the RGB parameters for this display
390 * from the machine specific parameters.
391 */
392 var->red = rgb->red;
393 var->green = rgb->green;
394 var->blue = rgb->blue;
395 var->transp = rgb->transp;
396
397 pr_debug("RGBT length = %d:%d:%d:%d\n",
398 var->red.length, var->green.length, var->blue.length,
399 var->transp.length);
400
401 pr_debug("RGBT offset = %d:%d:%d:%d\n",
402 var->red.offset, var->green.offset, var->blue.offset,
403 var->transp.offset);
404
405 return 0;
406 }
407
408 /*
409 * imxfb_set_par():
410 * Set the user defined part of the display for the specified console
411 */
imxfb_set_par(struct fb_info * info)412 static int imxfb_set_par(struct fb_info *info)
413 {
414 struct imxfb_info *fbi = info->par;
415 struct fb_var_screeninfo *var = &info->var;
416
417 if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
418 info->fix.visual = FB_VISUAL_TRUECOLOR;
419 else if (!fbi->cmap_static)
420 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
421 else {
422 /*
423 * Some people have weird ideas about wanting static
424 * pseudocolor maps. I suspect their user space
425 * applications are broken.
426 */
427 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
428 }
429
430 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
431 fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
432
433 imxfb_activate_var(var, info);
434
435 return 0;
436 }
437
438 #ifdef PWMR_BACKLIGHT_AVAILABLE
imxfb_bl_get_brightness(struct backlight_device * bl)439 static int imxfb_bl_get_brightness(struct backlight_device *bl)
440 {
441 struct imxfb_info *fbi = bl_get_data(bl);
442
443 return readl(fbi->regs + LCDC_PWMR) & 0xFF;
444 }
445
imxfb_bl_update_status(struct backlight_device * bl)446 static int imxfb_bl_update_status(struct backlight_device *bl)
447 {
448 struct imxfb_info *fbi = bl_get_data(bl);
449 int brightness = bl->props.brightness;
450
451 if (bl->props.power != FB_BLANK_UNBLANK)
452 brightness = 0;
453 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
454 brightness = 0;
455
456 fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
457
458 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
459 clk_enable(fbi->clk);
460 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
461 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
462 clk_disable(fbi->clk);
463
464 return 0;
465 }
466
467 static const struct backlight_ops imxfb_lcdc_bl_ops = {
468 .update_status = imxfb_bl_update_status,
469 .get_brightness = imxfb_bl_get_brightness,
470 };
471
imxfb_init_backlight(struct imxfb_info * fbi)472 static void imxfb_init_backlight(struct imxfb_info *fbi)
473 {
474 struct backlight_properties props;
475 struct backlight_device *bl;
476
477 if (fbi->bl)
478 return;
479
480 memset(&props, 0, sizeof(struct backlight_properties));
481 props.max_brightness = 0xff;
482 props.type = BACKLIGHT_RAW;
483 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
484
485 bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
486 &imxfb_lcdc_bl_ops, &props);
487 if (IS_ERR(bl)) {
488 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
489 PTR_ERR(bl));
490 return;
491 }
492
493 fbi->bl = bl;
494 bl->props.power = FB_BLANK_UNBLANK;
495 bl->props.fb_blank = FB_BLANK_UNBLANK;
496 bl->props.brightness = imxfb_bl_get_brightness(bl);
497 }
498
imxfb_exit_backlight(struct imxfb_info * fbi)499 static void imxfb_exit_backlight(struct imxfb_info *fbi)
500 {
501 if (fbi->bl)
502 backlight_device_unregister(fbi->bl);
503 }
504 #endif
505
imxfb_enable_controller(struct imxfb_info * fbi)506 static void imxfb_enable_controller(struct imxfb_info *fbi)
507 {
508 pr_debug("Enabling LCD controller\n");
509
510 writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
511
512 /* panning offset 0 (0 pixel offset) */
513 writel(0x00000000, fbi->regs + LCDC_POS);
514
515 /* disable hardware cursor */
516 writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
517 fbi->regs + LCDC_CPOS);
518
519 /*
520 * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
521 * on other SoCs
522 */
523 writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
524
525 clk_enable(fbi->clk);
526
527 if (fbi->backlight_power)
528 fbi->backlight_power(1);
529 if (fbi->lcd_power)
530 fbi->lcd_power(1);
531 }
532
imxfb_disable_controller(struct imxfb_info * fbi)533 static void imxfb_disable_controller(struct imxfb_info *fbi)
534 {
535 pr_debug("Disabling LCD controller\n");
536
537 if (fbi->backlight_power)
538 fbi->backlight_power(0);
539 if (fbi->lcd_power)
540 fbi->lcd_power(0);
541
542 clk_disable(fbi->clk);
543
544 writel(0, fbi->regs + LCDC_RMCR);
545 }
546
imxfb_blank(int blank,struct fb_info * info)547 static int imxfb_blank(int blank, struct fb_info *info)
548 {
549 struct imxfb_info *fbi = info->par;
550
551 pr_debug("imxfb_blank: blank=%d\n", blank);
552
553 switch (blank) {
554 case FB_BLANK_POWERDOWN:
555 case FB_BLANK_VSYNC_SUSPEND:
556 case FB_BLANK_HSYNC_SUSPEND:
557 case FB_BLANK_NORMAL:
558 imxfb_disable_controller(fbi);
559 break;
560
561 case FB_BLANK_UNBLANK:
562 imxfb_enable_controller(fbi);
563 break;
564 }
565 return 0;
566 }
567
568 static struct fb_ops imxfb_ops = {
569 .owner = THIS_MODULE,
570 .fb_check_var = imxfb_check_var,
571 .fb_set_par = imxfb_set_par,
572 .fb_setcolreg = imxfb_setcolreg,
573 .fb_fillrect = cfb_fillrect,
574 .fb_copyarea = cfb_copyarea,
575 .fb_imageblit = cfb_imageblit,
576 .fb_blank = imxfb_blank,
577 };
578
579 /*
580 * imxfb_activate_var():
581 * Configures LCD Controller based on entries in var parameter. Settings are
582 * only written to the controller if changes were made.
583 */
imxfb_activate_var(struct fb_var_screeninfo * var,struct fb_info * info)584 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
585 {
586 struct imxfb_info *fbi = info->par;
587
588 pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
589 var->xres, var->hsync_len,
590 var->left_margin, var->right_margin);
591 pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
592 var->yres, var->vsync_len,
593 var->upper_margin, var->lower_margin);
594
595 #if DEBUG_VAR
596 if (var->xres < 16 || var->xres > 1024)
597 printk(KERN_ERR "%s: invalid xres %d\n",
598 info->fix.id, var->xres);
599 if (var->hsync_len < 1 || var->hsync_len > 64)
600 printk(KERN_ERR "%s: invalid hsync_len %d\n",
601 info->fix.id, var->hsync_len);
602 if (var->left_margin > 255)
603 printk(KERN_ERR "%s: invalid left_margin %d\n",
604 info->fix.id, var->left_margin);
605 if (var->right_margin > 255)
606 printk(KERN_ERR "%s: invalid right_margin %d\n",
607 info->fix.id, var->right_margin);
608 if (var->yres < 1 || var->yres > YMAX_MASK)
609 printk(KERN_ERR "%s: invalid yres %d\n",
610 info->fix.id, var->yres);
611 if (var->vsync_len > 100)
612 printk(KERN_ERR "%s: invalid vsync_len %d\n",
613 info->fix.id, var->vsync_len);
614 if (var->upper_margin > 63)
615 printk(KERN_ERR "%s: invalid upper_margin %d\n",
616 info->fix.id, var->upper_margin);
617 if (var->lower_margin > 255)
618 printk(KERN_ERR "%s: invalid lower_margin %d\n",
619 info->fix.id, var->lower_margin);
620 #endif
621
622 /* physical screen start address */
623 writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
624 fbi->regs + LCDC_VPW);
625
626 writel(HCR_H_WIDTH(var->hsync_len - 1) |
627 HCR_H_WAIT_1(var->right_margin - 1) |
628 HCR_H_WAIT_2(var->left_margin - 3),
629 fbi->regs + LCDC_HCR);
630
631 writel(VCR_V_WIDTH(var->vsync_len) |
632 VCR_V_WAIT_1(var->lower_margin) |
633 VCR_V_WAIT_2(var->upper_margin),
634 fbi->regs + LCDC_VCR);
635
636 writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
637 fbi->regs + LCDC_SIZE);
638
639 writel(fbi->pcr, fbi->regs + LCDC_PCR);
640 #ifndef PWMR_BACKLIGHT_AVAILABLE
641 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
642 #endif
643 writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
644 writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
645
646 return 0;
647 }
648
649 #ifdef CONFIG_PM
650 /*
651 * Power management hooks. Note that we won't be called from IRQ context,
652 * unlike the blank functions above, so we may sleep.
653 */
imxfb_suspend(struct platform_device * dev,pm_message_t state)654 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
655 {
656 struct fb_info *info = platform_get_drvdata(dev);
657 struct imxfb_info *fbi = info->par;
658
659 pr_debug("%s\n", __func__);
660
661 imxfb_disable_controller(fbi);
662 return 0;
663 }
664
imxfb_resume(struct platform_device * dev)665 static int imxfb_resume(struct platform_device *dev)
666 {
667 struct fb_info *info = platform_get_drvdata(dev);
668 struct imxfb_info *fbi = info->par;
669
670 pr_debug("%s\n", __func__);
671
672 imxfb_enable_controller(fbi);
673 return 0;
674 }
675 #else
676 #define imxfb_suspend NULL
677 #define imxfb_resume NULL
678 #endif
679
imxfb_init_fbinfo(struct platform_device * pdev)680 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
681 {
682 struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
683 struct fb_info *info = dev_get_drvdata(&pdev->dev);
684 struct imxfb_info *fbi = info->par;
685 struct imx_fb_videomode *m;
686 int i;
687
688 pr_debug("%s\n",__func__);
689
690 info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
691 if (!info->pseudo_palette)
692 return -ENOMEM;
693
694 memset(fbi, 0, sizeof(struct imxfb_info));
695
696 strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
697
698 info->fix.type = FB_TYPE_PACKED_PIXELS;
699 info->fix.type_aux = 0;
700 info->fix.xpanstep = 0;
701 info->fix.ypanstep = 0;
702 info->fix.ywrapstep = 0;
703 info->fix.accel = FB_ACCEL_NONE;
704
705 info->var.nonstd = 0;
706 info->var.activate = FB_ACTIVATE_NOW;
707 info->var.height = -1;
708 info->var.width = -1;
709 info->var.accel_flags = 0;
710 info->var.vmode = FB_VMODE_NONINTERLACED;
711
712 info->fbops = &imxfb_ops;
713 info->flags = FBINFO_FLAG_DEFAULT |
714 FBINFO_READS_FAST;
715 info->var.grayscale = pdata->cmap_greyscale;
716 fbi->cmap_inverse = pdata->cmap_inverse;
717 fbi->cmap_static = pdata->cmap_static;
718 fbi->lscr1 = pdata->lscr1;
719 fbi->dmacr = pdata->dmacr;
720 fbi->pwmr = pdata->pwmr;
721 fbi->lcd_power = pdata->lcd_power;
722 fbi->backlight_power = pdata->backlight_power;
723
724 for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
725 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
726 m->mode.xres * m->mode.yres * m->bpp / 8);
727
728 return 0;
729 }
730
imxfb_probe(struct platform_device * pdev)731 static int __init imxfb_probe(struct platform_device *pdev)
732 {
733 struct imxfb_info *fbi;
734 struct fb_info *info;
735 struct imx_fb_platform_data *pdata;
736 struct resource *res;
737 int ret, i;
738
739 dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
740
741 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
742 if (!res)
743 return -ENODEV;
744
745 pdata = pdev->dev.platform_data;
746 if (!pdata) {
747 dev_err(&pdev->dev,"No platform_data available\n");
748 return -ENOMEM;
749 }
750
751 info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
752 if (!info)
753 return -ENOMEM;
754
755 fbi = info->par;
756
757 if (!fb_mode)
758 fb_mode = pdata->mode[0].mode.name;
759
760 platform_set_drvdata(pdev, info);
761
762 ret = imxfb_init_fbinfo(pdev);
763 if (ret < 0)
764 goto failed_init;
765
766 res = request_mem_region(res->start, resource_size(res),
767 DRIVER_NAME);
768 if (!res) {
769 ret = -EBUSY;
770 goto failed_req;
771 }
772
773 fbi->clk = clk_get(&pdev->dev, NULL);
774 if (IS_ERR(fbi->clk)) {
775 ret = PTR_ERR(fbi->clk);
776 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
777 goto failed_getclock;
778 }
779
780 fbi->regs = ioremap(res->start, resource_size(res));
781 if (fbi->regs == NULL) {
782 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
783 goto failed_ioremap;
784 }
785
786 if (!pdata->fixed_screen_cpu) {
787 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
788 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
789 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
790
791 if (!fbi->map_cpu) {
792 dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
793 ret = -ENOMEM;
794 goto failed_map;
795 }
796
797 info->screen_base = fbi->map_cpu;
798 fbi->screen_cpu = fbi->map_cpu;
799 fbi->screen_dma = fbi->map_dma;
800 info->fix.smem_start = fbi->screen_dma;
801 } else {
802 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
803 fbi->map_cpu = pdata->fixed_screen_cpu;
804 fbi->map_dma = pdata->fixed_screen_dma;
805 info->screen_base = fbi->map_cpu;
806 fbi->screen_cpu = fbi->map_cpu;
807 fbi->screen_dma = fbi->map_dma;
808 info->fix.smem_start = fbi->screen_dma;
809 }
810
811 if (pdata->init) {
812 ret = pdata->init(fbi->pdev);
813 if (ret)
814 goto failed_platform_init;
815 }
816
817 fbi->mode = pdata->mode;
818 fbi->num_modes = pdata->num_modes;
819
820 INIT_LIST_HEAD(&info->modelist);
821 for (i = 0; i < pdata->num_modes; i++)
822 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
823
824 /*
825 * This makes sure that our colour bitfield
826 * descriptors are correctly initialised.
827 */
828 imxfb_check_var(&info->var, info);
829
830 ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
831 if (ret < 0)
832 goto failed_cmap;
833
834 imxfb_set_par(info);
835 ret = register_framebuffer(info);
836 if (ret < 0) {
837 dev_err(&pdev->dev, "failed to register framebuffer\n");
838 goto failed_register;
839 }
840
841 imxfb_enable_controller(fbi);
842 fbi->pdev = pdev;
843 #ifdef PWMR_BACKLIGHT_AVAILABLE
844 imxfb_init_backlight(fbi);
845 #endif
846
847 return 0;
848
849 failed_register:
850 fb_dealloc_cmap(&info->cmap);
851 failed_cmap:
852 if (pdata->exit)
853 pdata->exit(fbi->pdev);
854 failed_platform_init:
855 if (!pdata->fixed_screen_cpu)
856 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
857 fbi->map_dma);
858 failed_map:
859 iounmap(fbi->regs);
860 failed_ioremap:
861 clk_put(fbi->clk);
862 failed_getclock:
863 release_mem_region(res->start, resource_size(res));
864 failed_req:
865 kfree(info->pseudo_palette);
866 failed_init:
867 platform_set_drvdata(pdev, NULL);
868 framebuffer_release(info);
869 return ret;
870 }
871
imxfb_remove(struct platform_device * pdev)872 static int __devexit imxfb_remove(struct platform_device *pdev)
873 {
874 struct imx_fb_platform_data *pdata;
875 struct fb_info *info = platform_get_drvdata(pdev);
876 struct imxfb_info *fbi = info->par;
877 struct resource *res;
878
879 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
880
881 imxfb_disable_controller(fbi);
882
883 #ifdef PWMR_BACKLIGHT_AVAILABLE
884 imxfb_exit_backlight(fbi);
885 #endif
886 unregister_framebuffer(info);
887
888 pdata = pdev->dev.platform_data;
889 if (pdata->exit)
890 pdata->exit(fbi->pdev);
891
892 fb_dealloc_cmap(&info->cmap);
893 kfree(info->pseudo_palette);
894 framebuffer_release(info);
895
896 iounmap(fbi->regs);
897 release_mem_region(res->start, resource_size(res));
898 clk_disable(fbi->clk);
899 clk_put(fbi->clk);
900
901 platform_set_drvdata(pdev, NULL);
902
903 return 0;
904 }
905
imxfb_shutdown(struct platform_device * dev)906 void imxfb_shutdown(struct platform_device * dev)
907 {
908 struct fb_info *info = platform_get_drvdata(dev);
909 struct imxfb_info *fbi = info->par;
910 imxfb_disable_controller(fbi);
911 }
912
913 static struct platform_driver imxfb_driver = {
914 .suspend = imxfb_suspend,
915 .resume = imxfb_resume,
916 .remove = __devexit_p(imxfb_remove),
917 .shutdown = imxfb_shutdown,
918 .driver = {
919 .name = DRIVER_NAME,
920 },
921 };
922
imxfb_setup(void)923 static int imxfb_setup(void)
924 {
925 #ifndef MODULE
926 char *opt, *options = NULL;
927
928 if (fb_get_options("imxfb", &options))
929 return -ENODEV;
930
931 if (!options || !*options)
932 return 0;
933
934 while ((opt = strsep(&options, ",")) != NULL) {
935 if (!*opt)
936 continue;
937 else
938 fb_mode = opt;
939 }
940 #endif
941 return 0;
942 }
943
imxfb_init(void)944 int __init imxfb_init(void)
945 {
946 int ret = imxfb_setup();
947
948 if (ret < 0)
949 return ret;
950
951 return platform_driver_probe(&imxfb_driver, imxfb_probe);
952 }
953
imxfb_cleanup(void)954 static void __exit imxfb_cleanup(void)
955 {
956 platform_driver_unregister(&imxfb_driver);
957 }
958
959 module_init(imxfb_init);
960 module_exit(imxfb_cleanup);
961
962 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
963 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
964 MODULE_LICENSE("GPL");
965