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Linux 4.16.11
[linux/fpc-iii.git] / drivers / video / fbdev / nuc900fb.c
blob6680edae4696d1b0dc4dff547dda27ca8c159ab5
1 /*
2 *
3 * Copyright (c) 2009 Nuvoton technology corporation
4 * All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * Description:
12 * Nuvoton LCD Controller Driver
13 * Author:
14 * Wang Qiang (rurality.linux@gmail.com) 2009/12/11
15 */
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/err.h>
19 #include <linux/errno.h>
20 #include <linux/string.h>
21 #include <linux/mm.h>
22 #include <linux/tty.h>
23 #include <linux/slab.h>
24 #include <linux/delay.h>
25 #include <linux/fb.h>
26 #include <linux/init.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/interrupt.h>
29 #include <linux/workqueue.h>
30 #include <linux/wait.h>
31 #include <linux/platform_device.h>
32 #include <linux/clk.h>
33 #include <linux/cpufreq.h>
34 #include <linux/io.h>
35 #include <linux/pm.h>
36 #include <linux/device.h>
37
38 #include <mach/map.h>
39 #include <mach/regs-clock.h>
40 #include <mach/regs-ldm.h>
41 #include <linux/platform_data/video-nuc900fb.h>
42
43 #include "nuc900fb.h"
44
45
46 /*
47 * Initialize the nuc900 video (dual) buffer address
48 */
49 static void nuc900fb_set_lcdaddr(struct fb_info *info)
50 {
51 struct nuc900fb_info *fbi = info->par;
52 void __iomem *regs = fbi->io;
53 unsigned long vbaddr1, vbaddr2;
54
55 vbaddr1 = info->fix.smem_start;
56 vbaddr2 = info->fix.smem_start;
57 vbaddr2 += info->fix.line_length * info->var.yres;
58
59 /* set frambuffer start phy addr*/
60 writel(vbaddr1, regs + REG_LCM_VA_BADDR0);
61 writel(vbaddr2, regs + REG_LCM_VA_BADDR1);
62
63 writel(fbi->regs.lcd_va_fbctrl, regs + REG_LCM_VA_FBCTRL);
64 writel(fbi->regs.lcd_va_scale, regs + REG_LCM_VA_SCALE);
65 }
66
67 /*
68 * calculate divider for lcd div
69 */
70 static unsigned int nuc900fb_calc_pixclk(struct nuc900fb_info *fbi,
71 unsigned long pixclk)
72 {
73 unsigned long clk = fbi->clk_rate;
74 unsigned long long div;
75
76 /* pixclk is in picseconds. our clock is in Hz*/
77 /* div = (clk * pixclk)/10^12 */
78 div = (unsigned long long)clk * pixclk;
79 div >>= 12;
80 do_div(div, 625 * 625UL * 625);
81
82 dev_dbg(fbi->dev, "pixclk %ld, divisor is %lld\n", pixclk, div);
83
84 return div;
85 }
86
87 /*
88 * Check the video params of 'var'.
89 */
90 static int nuc900fb_check_var(struct fb_var_screeninfo *var,
91 struct fb_info *info)
92 {
93 struct nuc900fb_info *fbi = info->par;
94 struct nuc900fb_mach_info *mach_info = dev_get_platdata(fbi->dev);
95 struct nuc900fb_display *display = NULL;
96 struct nuc900fb_display *default_display = mach_info->displays +
97 mach_info->default_display;
98 int i;
99
100 dev_dbg(fbi->dev, "check_var(var=%p, info=%p)\n", var, info);
101
102 /* validate x/y resolution */
103 /* choose default mode if possible */
104 if (var->xres == default_display->xres &&
105 var->yres == default_display->yres &&
106 var->bits_per_pixel == default_display->bpp)
107 display = default_display;
108 else
109 for (i = 0; i < mach_info->num_displays; i++)
110 if (var->xres == mach_info->displays[i].xres &&
111 var->yres == mach_info->displays[i].yres &&
112 var->bits_per_pixel == mach_info->displays[i].bpp) {
113 display = mach_info->displays + i;
114 break;
115 }
116
117 if (display == NULL) {
118 printk(KERN_ERR "wrong resolution or depth %dx%d at %d bit per pixel\n",
119 var->xres, var->yres, var->bits_per_pixel);
120 return -EINVAL;
121 }
122
123 /* it should be the same size as the display */
124 var->xres_virtual = display->xres;
125 var->yres_virtual = display->yres;
126 var->height = display->height;
127 var->width = display->width;
128
129 /* copy lcd settings */
130 var->pixclock = display->pixclock;
131 var->left_margin = display->left_margin;
132 var->right_margin = display->right_margin;
133 var->upper_margin = display->upper_margin;
134 var->lower_margin = display->lower_margin;
135 var->vsync_len = display->vsync_len;
136 var->hsync_len = display->hsync_len;
137
138 var->transp.offset = 0;
139 var->transp.length = 0;
140
141 fbi->regs.lcd_dccs = display->dccs;
142 fbi->regs.lcd_device_ctrl = display->devctl;
143 fbi->regs.lcd_va_fbctrl = display->fbctrl;
144 fbi->regs.lcd_va_scale = display->scale;
145
146 /* set R/G/B possions */
147 switch (var->bits_per_pixel) {
148 case 1:
149 case 2:
150 case 4:
151 case 8:
152 default:
153 var->red.offset = 0;
154 var->red.length = var->bits_per_pixel;
155 var->green = var->red;
156 var->blue = var->red;
157 break;
158 case 12:
159 var->red.length = 4;
160 var->green.length = 4;
161 var->blue.length = 4;
162 var->red.offset = 8;
163 var->green.offset = 4;
164 var->blue.offset = 0;
165 break;
166 case 16:
167 var->red.length = 5;
168 var->green.length = 6;
169 var->blue.length = 5;
170 var->red.offset = 11;
171 var->green.offset = 5;
172 var->blue.offset = 0;
173 break;
174 case 18:
175 var->red.length = 6;
176 var->green.length = 6;
177 var->blue.length = 6;
178 var->red.offset = 12;
179 var->green.offset = 6;
180 var->blue.offset = 0;
181 break;
182 case 32:
183 var->red.length = 8;
184 var->green.length = 8;
185 var->blue.length = 8;
186 var->red.offset = 16;
187 var->green.offset = 8;
188 var->blue.offset = 0;
189 break;
190 }
191
192 return 0;
193 }
194
195 /*
196 * Calculate lcd register values from var setting & save into hw
197 */
198 static void nuc900fb_calculate_lcd_regs(const struct fb_info *info,
199 struct nuc900fb_hw *regs)
200 {
201 const struct fb_var_screeninfo *var = &info->var;
202 int vtt = var->height + var->upper_margin + var->lower_margin;
203 int htt = var->width + var->left_margin + var->right_margin;
204 int hsync = var->width + var->right_margin;
205 int vsync = var->height + var->lower_margin;
206
207 regs->lcd_crtc_size = LCM_CRTC_SIZE_VTTVAL(vtt) |
208 LCM_CRTC_SIZE_HTTVAL(htt);
209 regs->lcd_crtc_dend = LCM_CRTC_DEND_VDENDVAL(var->height) |
210 LCM_CRTC_DEND_HDENDVAL(var->width);
211 regs->lcd_crtc_hr = LCM_CRTC_HR_EVAL(var->width + 5) |
212 LCM_CRTC_HR_SVAL(var->width + 1);
213 regs->lcd_crtc_hsync = LCM_CRTC_HSYNC_EVAL(hsync + var->hsync_len) |
214 LCM_CRTC_HSYNC_SVAL(hsync);
215 regs->lcd_crtc_vr = LCM_CRTC_VR_EVAL(vsync + var->vsync_len) |
216 LCM_CRTC_VR_SVAL(vsync);
217
218 }
219
220 /*
221 * Activate (set) the controller from the given framebuffer
222 * information
223 */
224 static void nuc900fb_activate_var(struct fb_info *info)
225 {
226 struct nuc900fb_info *fbi = info->par;
227 void __iomem *regs = fbi->io;
228 struct fb_var_screeninfo *var = &info->var;
229 int clkdiv;
230
231 clkdiv = nuc900fb_calc_pixclk(fbi, var->pixclock) - 1;
232 if (clkdiv < 0)
233 clkdiv = 0;
234
235 nuc900fb_calculate_lcd_regs(info, &fbi->regs);
236
237 /* set the new lcd registers*/
238
239 dev_dbg(fbi->dev, "new lcd register set:\n");
240 dev_dbg(fbi->dev, "dccs = 0x%08x\n", fbi->regs.lcd_dccs);
241 dev_dbg(fbi->dev, "dev_ctl = 0x%08x\n", fbi->regs.lcd_device_ctrl);
242 dev_dbg(fbi->dev, "crtc_size = 0x%08x\n", fbi->regs.lcd_crtc_size);
243 dev_dbg(fbi->dev, "crtc_dend = 0x%08x\n", fbi->regs.lcd_crtc_dend);
244 dev_dbg(fbi->dev, "crtc_hr = 0x%08x\n", fbi->regs.lcd_crtc_hr);
245 dev_dbg(fbi->dev, "crtc_hsync = 0x%08x\n", fbi->regs.lcd_crtc_hsync);
246 dev_dbg(fbi->dev, "crtc_vr = 0x%08x\n", fbi->regs.lcd_crtc_vr);
247
248 writel(fbi->regs.lcd_device_ctrl, regs + REG_LCM_DEV_CTRL);
249 writel(fbi->regs.lcd_crtc_size, regs + REG_LCM_CRTC_SIZE);
250 writel(fbi->regs.lcd_crtc_dend, regs + REG_LCM_CRTC_DEND);
251 writel(fbi->regs.lcd_crtc_hr, regs + REG_LCM_CRTC_HR);
252 writel(fbi->regs.lcd_crtc_hsync, regs + REG_LCM_CRTC_HSYNC);
253 writel(fbi->regs.lcd_crtc_vr, regs + REG_LCM_CRTC_VR);
254
255 /* set lcd address pointers */
256 nuc900fb_set_lcdaddr(info);
257
258 writel(fbi->regs.lcd_dccs, regs + REG_LCM_DCCS);
259 }
260
261 /*
262 * Alters the hardware state.
263 *
264 */
265 static int nuc900fb_set_par(struct fb_info *info)
266 {
267 struct fb_var_screeninfo *var = &info->var;
268
269 switch (var->bits_per_pixel) {
270 case 32:
271 case 24:
272 case 18:
273 case 16:
274 case 12:
275 info->fix.visual = FB_VISUAL_TRUECOLOR;
276 break;
277 case 1:
278 info->fix.visual = FB_VISUAL_MONO01;
279 break;
280 default:
281 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
282 break;
283 }
284
285 info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
286
287 /* activate this new configuration */
288 nuc900fb_activate_var(info);
289 return 0;
290 }
291
292 static inline unsigned int chan_to_field(unsigned int chan,
293 struct fb_bitfield *bf)
294 {
295 chan &= 0xffff;
296 chan >>= 16 - bf->length;
297 return chan << bf->offset;
298 }
299
300 static int nuc900fb_setcolreg(unsigned regno,
301 unsigned red, unsigned green, unsigned blue,
302 unsigned transp, struct fb_info *info)
303 {
304 unsigned int val;
305
306 switch (info->fix.visual) {
307 case FB_VISUAL_TRUECOLOR:
308 /* true-colour, use pseuo-palette */
309 if (regno < 16) {
310 u32 *pal = info->pseudo_palette;
311
312 val = chan_to_field(red, &info->var.red);
313 val |= chan_to_field(green, &info->var.green);
314 val |= chan_to_field(blue, &info->var.blue);
315 pal[regno] = val;
316 }
317 break;
318
319 default:
320 return 1; /* unknown type */
321 }
322 return 0;
323 }
324
325 /**
326 * nuc900fb_blank
327 *
328 */
329 static int nuc900fb_blank(int blank_mode, struct fb_info *info)
330 {
331
332 return 0;
333 }
334
335 static struct fb_ops nuc900fb_ops = {
336 .owner = THIS_MODULE,
337 .fb_check_var = nuc900fb_check_var,
338 .fb_set_par = nuc900fb_set_par,
339 .fb_blank = nuc900fb_blank,
340 .fb_setcolreg = nuc900fb_setcolreg,
341 .fb_fillrect = cfb_fillrect,
342 .fb_copyarea = cfb_copyarea,
343 .fb_imageblit = cfb_imageblit,
344 };
345
346
347 static inline void modify_gpio(void __iomem *reg,
348 unsigned long set, unsigned long mask)
349 {
350 unsigned long tmp;
351 tmp = readl(reg) & ~mask;
352 writel(tmp | set, reg);
353 }
354
355 /*
356 * Initialise LCD-related registers
357 */
358 static int nuc900fb_init_registers(struct fb_info *info)
359 {
360 struct nuc900fb_info *fbi = info->par;
361 struct nuc900fb_mach_info *mach_info = dev_get_platdata(fbi->dev);
362 void __iomem *regs = fbi->io;
363
364 /*reset the display engine*/
365 writel(0, regs + REG_LCM_DCCS);
366 writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_ENG_RST,
367 regs + REG_LCM_DCCS);
368 ndelay(100);
369 writel(readl(regs + REG_LCM_DCCS) & (~LCM_DCCS_ENG_RST),
370 regs + REG_LCM_DCCS);
371 ndelay(100);
372
373 writel(0, regs + REG_LCM_DEV_CTRL);
374
375 /* config gpio output */
376 modify_gpio(W90X900_VA_GPIO + 0x54, mach_info->gpio_dir,
377 mach_info->gpio_dir_mask);
378 modify_gpio(W90X900_VA_GPIO + 0x58, mach_info->gpio_data,
379 mach_info->gpio_data_mask);
380
381 return 0;
382 }
383
384
385 /*
386 * Alloc the SDRAM region of NUC900 for the frame buffer.
387 * The buffer should be a non-cached, non-buffered, memory region
388 * to allow palette and pixel writes without flushing the cache.
389 */
390 static int nuc900fb_map_video_memory(struct fb_info *info)
391 {
392 struct nuc900fb_info *fbi = info->par;
393 dma_addr_t map_dma;
394 unsigned long map_size = PAGE_ALIGN(info->fix.smem_len);
395
396 dev_dbg(fbi->dev, "nuc900fb_map_video_memory(fbi=%p) map_size %lu\n",
397 fbi, map_size);
398
399 info->screen_base = dma_alloc_wc(fbi->dev, map_size, &map_dma,
400 GFP_KERNEL);
401
402 if (!info->screen_base)
403 return -ENOMEM;
404
405 memset(info->screen_base, 0x00, map_size);
406 info->fix.smem_start = map_dma;
407
408 return 0;
409 }
410
411 static inline void nuc900fb_unmap_video_memory(struct fb_info *info)
412 {
413 struct nuc900fb_info *fbi = info->par;
414 dma_free_wc(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
415 info->screen_base, info->fix.smem_start);
416 }
417
418 static irqreturn_t nuc900fb_irqhandler(int irq, void *dev_id)
419 {
420 struct nuc900fb_info *fbi = dev_id;
421 void __iomem *regs = fbi->io;
422 void __iomem *irq_base = fbi->irq_base;
423 unsigned long lcdirq = readl(regs + REG_LCM_INT_CS);
424
425 if (lcdirq & LCM_INT_CS_DISP_F_STATUS) {
426 writel(readl(irq_base) | 1<<30, irq_base);
427
428 /* wait VA_EN low */
429 if ((readl(regs + REG_LCM_DCCS) &
430 LCM_DCCS_SINGLE) == LCM_DCCS_SINGLE)
431 while ((readl(regs + REG_LCM_DCCS) &
432 LCM_DCCS_VA_EN) == LCM_DCCS_VA_EN)
433 ;
434 /* display_out-enable */
435 writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_DISP_OUT_EN,
436 regs + REG_LCM_DCCS);
437 /* va-enable*/
438 writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_VA_EN,
439 regs + REG_LCM_DCCS);
440 } else if (lcdirq & LCM_INT_CS_UNDERRUN_INT) {
441 writel(readl(irq_base) | LCM_INT_CS_UNDERRUN_INT, irq_base);
442 } else if (lcdirq & LCM_INT_CS_BUS_ERROR_INT) {
443 writel(readl(irq_base) | LCM_INT_CS_BUS_ERROR_INT, irq_base);
444 }
445
446 return IRQ_HANDLED;
447 }
448
449 #ifdef CONFIG_CPU_FREQ
450
451 static int nuc900fb_cpufreq_transition(struct notifier_block *nb,
452 unsigned long val, void *data)
453 {
454 struct nuc900fb_info *info;
455 struct fb_info *fbinfo;
456 long delta_f;
457 info = container_of(nb, struct nuc900fb_info, freq_transition);
458 fbinfo = platform_get_drvdata(to_platform_device(info->dev));
459
460 delta_f = info->clk_rate - clk_get_rate(info->clk);
461
462 if ((val == CPUFREQ_POSTCHANGE && delta_f > 0) ||
463 (val == CPUFREQ_PRECHANGE && delta_f < 0)) {
464 info->clk_rate = clk_get_rate(info->clk);
465 nuc900fb_activate_var(fbinfo);
466 }
467
468 return 0;
469 }
470
471 static inline int nuc900fb_cpufreq_register(struct nuc900fb_info *fbi)
472 {
473 fbi->freq_transition.notifier_call = nuc900fb_cpufreq_transition;
474 return cpufreq_register_notifier(&fbi->freq_transition,
475 CPUFREQ_TRANSITION_NOTIFIER);
476 }
477
478 static inline void nuc900fb_cpufreq_deregister(struct nuc900fb_info *fbi)
479 {
480 cpufreq_unregister_notifier(&fbi->freq_transition,
481 CPUFREQ_TRANSITION_NOTIFIER);
482 }
483 #else
484 static inline int nuc900fb_cpufreq_transition(struct notifier_block *nb,
485 unsigned long val, void *data)
486 {
487 return 0;
488 }
489
490 static inline int nuc900fb_cpufreq_register(struct nuc900fb_info *fbi)
491 {
492 return 0;
493 }
494
495 static inline void nuc900fb_cpufreq_deregister(struct nuc900fb_info *info)
496 {
497 }
498 #endif
499
500 static char driver_name[] = "nuc900fb";
501
502 static int nuc900fb_probe(struct platform_device *pdev)
503 {
504 struct nuc900fb_info *fbi;
505 struct nuc900fb_display *display;
506 struct fb_info *fbinfo;
507 struct nuc900fb_mach_info *mach_info;
508 struct resource *res;
509 int ret;
510 int irq;
511 int i;
512 int size;
513
514 dev_dbg(&pdev->dev, "devinit\n");
515 mach_info = dev_get_platdata(&pdev->dev);
516 if (mach_info == NULL) {
517 dev_err(&pdev->dev,
518 "no platform data for lcd, cannot attach\n");
519 return -EINVAL;
520 }
521
522 if (mach_info->default_display > mach_info->num_displays) {
523 dev_err(&pdev->dev,
524 "default display No. is %d but only %d displays \n",
525 mach_info->default_display, mach_info->num_displays);
526 return -EINVAL;
527 }
528
529
530 display = mach_info->displays + mach_info->default_display;
531
532 irq = platform_get_irq(pdev, 0);
533 if (irq < 0) {
534 dev_err(&pdev->dev, "no irq for device\n");
535 return -ENOENT;
536 }
537
538 fbinfo = framebuffer_alloc(sizeof(struct nuc900fb_info), &pdev->dev);
539 if (!fbinfo)
540 return -ENOMEM;
541
542 platform_set_drvdata(pdev, fbinfo);
543
544 fbi = fbinfo->par;
545 fbi->dev = &pdev->dev;
546
547 #ifdef CONFIG_CPU_NUC950
548 fbi->drv_type = LCDDRV_NUC950;
549 #endif
550
551 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
552
553 size = resource_size(res);
554 fbi->mem = request_mem_region(res->start, size, pdev->name);
555 if (fbi->mem == NULL) {
556 dev_err(&pdev->dev, "failed to alloc memory region\n");
557 ret = -ENOENT;
558 goto free_fb;
559 }
560
561 fbi->io = ioremap(res->start, size);
562 if (fbi->io == NULL) {
563 dev_err(&pdev->dev, "ioremap() of lcd registers failed\n");
564 ret = -ENXIO;
565 goto release_mem_region;
566 }
567
568 fbi->irq_base = fbi->io + REG_LCM_INT_CS;
569
570
571 /* Stop the LCD */
572 writel(0, fbi->io + REG_LCM_DCCS);
573
574 /* fill the fbinfo*/
575 strcpy(fbinfo->fix.id, driver_name);
576 fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
577 fbinfo->fix.type_aux = 0;
578 fbinfo->fix.xpanstep = 0;
579 fbinfo->fix.ypanstep = 0;
580 fbinfo->fix.ywrapstep = 0;
581 fbinfo->fix.accel = FB_ACCEL_NONE;
582 fbinfo->var.nonstd = 0;
583 fbinfo->var.activate = FB_ACTIVATE_NOW;
584 fbinfo->var.accel_flags = 0;
585 fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
586 fbinfo->fbops = &nuc900fb_ops;
587 fbinfo->flags = FBINFO_FLAG_DEFAULT;
588 fbinfo->pseudo_palette = &fbi->pseudo_pal;
589
590 ret = request_irq(irq, nuc900fb_irqhandler, 0, pdev->name, fbi);
591 if (ret) {
592 dev_err(&pdev->dev, "cannot register irq handler %d -err %d\n",
593 irq, ret);
594 ret = -EBUSY;
595 goto release_regs;
596 }
597
598 fbi->clk = clk_get(&pdev->dev, NULL);
599 if (IS_ERR(fbi->clk)) {
600 printk(KERN_ERR "nuc900-lcd:failed to get lcd clock source\n");
601 ret = PTR_ERR(fbi->clk);
602 goto release_irq;
603 }
604
605 clk_enable(fbi->clk);
606 dev_dbg(&pdev->dev, "got and enabled clock\n");
607
608 fbi->clk_rate = clk_get_rate(fbi->clk);
609
610 /* calutate the video buffer size */
611 for (i = 0; i < mach_info->num_displays; i++) {
612 unsigned long smem_len = mach_info->displays[i].xres;
613 smem_len *= mach_info->displays[i].yres;
614 smem_len *= mach_info->displays[i].bpp;
615 smem_len >>= 3;
616 if (fbinfo->fix.smem_len < smem_len)
617 fbinfo->fix.smem_len = smem_len;
618 }
619
620 /* Initialize Video Memory */
621 ret = nuc900fb_map_video_memory(fbinfo);
622 if (ret) {
623 printk(KERN_ERR "Failed to allocate video RAM: %x\n", ret);
624 goto release_clock;
625 }
626
627 dev_dbg(&pdev->dev, "got video memory\n");
628
629 fbinfo->var.xres = display->xres;
630 fbinfo->var.yres = display->yres;
631 fbinfo->var.bits_per_pixel = display->bpp;
632
633 nuc900fb_init_registers(fbinfo);
634
635 nuc900fb_check_var(&fbinfo->var, fbinfo);
636
637 ret = nuc900fb_cpufreq_register(fbi);
638 if (ret < 0) {
639 dev_err(&pdev->dev, "Failed to register cpufreq\n");
640 goto free_video_memory;
641 }
642
643 ret = register_framebuffer(fbinfo);
644 if (ret) {
645 printk(KERN_ERR "failed to register framebuffer device: %d\n",
646 ret);
647 goto free_cpufreq;
648 }
649
650 fb_info(fbinfo, "%s frame buffer device\n", fbinfo->fix.id);
651
652 return 0;
653
654 free_cpufreq:
655 nuc900fb_cpufreq_deregister(fbi);
656 free_video_memory:
657 nuc900fb_unmap_video_memory(fbinfo);
658 release_clock:
659 clk_disable(fbi->clk);
660 clk_put(fbi->clk);
661 release_irq:
662 free_irq(irq, fbi);
663 release_regs:
664 iounmap(fbi->io);
665 release_mem_region:
666 release_mem_region(res->start, size);
667 free_fb:
668 framebuffer_release(fbinfo);
669 return ret;
670 }
671
672 /*
673 * shutdown the lcd controller
674 */
675 static void nuc900fb_stop_lcd(struct fb_info *info)
676 {
677 struct nuc900fb_info *fbi = info->par;
678 void __iomem *regs = fbi->io;
679
680 writel((~LCM_DCCS_DISP_INT_EN) | (~LCM_DCCS_VA_EN) | (~LCM_DCCS_OSD_EN),
681 regs + REG_LCM_DCCS);
682 }
683
684 /*
685 * Cleanup
686 */
687 static int nuc900fb_remove(struct platform_device *pdev)
688 {
689 struct fb_info *fbinfo = platform_get_drvdata(pdev);
690 struct nuc900fb_info *fbi = fbinfo->par;
691 int irq;
692
693 nuc900fb_stop_lcd(fbinfo);
694 msleep(1);
695
696 unregister_framebuffer(fbinfo);
697 nuc900fb_cpufreq_deregister(fbi);
698 nuc900fb_unmap_video_memory(fbinfo);
699
700 iounmap(fbi->io);
701
702 irq = platform_get_irq(pdev, 0);
703 free_irq(irq, fbi);
704
705 release_resource(fbi->mem);
706 kfree(fbi->mem);
707
708 framebuffer_release(fbinfo);
709
710 return 0;
711 }
712
713 #ifdef CONFIG_PM
714
715 /*
716 * suspend and resume support for the lcd controller
717 */
718
719 static int nuc900fb_suspend(struct platform_device *dev, pm_message_t state)
720 {
721 struct fb_info *fbinfo = platform_get_drvdata(dev);
722 struct nuc900fb_info *info = fbinfo->par;
723
724 nuc900fb_stop_lcd(fbinfo);
725 msleep(1);
726 clk_disable(info->clk);
727 return 0;
728 }
729
730 static int nuc900fb_resume(struct platform_device *dev)
731 {
732 struct fb_info *fbinfo = platform_get_drvdata(dev);
733 struct nuc900fb_info *fbi = fbinfo->par;
734
735 printk(KERN_INFO "nuc900fb resume\n");
736
737 clk_enable(fbi->clk);
738 msleep(1);
739
740 nuc900fb_init_registers(fbinfo);
741 nuc900fb_activate_var(fbinfo);
742
743 return 0;
744 }
745
746 #else
747 #define nuc900fb_suspend NULL
748 #define nuc900fb_resume NULL
749 #endif
750
751 static struct platform_driver nuc900fb_driver = {
752 .probe = nuc900fb_probe,
753 .remove = nuc900fb_remove,
754 .suspend = nuc900fb_suspend,
755 .resume = nuc900fb_resume,
756 .driver = {
757 .name = "nuc900-lcd",
758 },
759 };
760
761 module_platform_driver(nuc900fb_driver);
762
763 MODULE_DESCRIPTION("Framebuffer driver for the NUC900");
764 MODULE_LICENSE("GPL");
Linux with added FPC-III support