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x86: Reduce back the alignment of the per-CPU data section
[zen-stable.git] / drivers / video / nuc900fb.c
blobf838d9e277f05e4fb5c9ee724d1f028a560e07a2
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 <mach/fb.h>
42 #include <mach/clkdev.h>
43
44 #include "nuc900fb.h"
45
46
47 /*
48 * Initialize the nuc900 video (dual) buffer address
49 */
50 static void nuc900fb_set_lcdaddr(struct fb_info *info)
51 {
52 struct nuc900fb_info *fbi = info->par;
53 void __iomem *regs = fbi->io;
54 unsigned long vbaddr1, vbaddr2;
55
56 vbaddr1 = info->fix.smem_start;
57 vbaddr2 = info->fix.smem_start;
58 vbaddr2 += info->fix.line_length * info->var.yres;
59
60 /* set frambuffer start phy addr*/
61 writel(vbaddr1, regs + REG_LCM_VA_BADDR0);
62 writel(vbaddr2, regs + REG_LCM_VA_BADDR1);
63
64 writel(fbi->regs.lcd_va_fbctrl, regs + REG_LCM_VA_FBCTRL);
65 writel(fbi->regs.lcd_va_scale, regs + REG_LCM_VA_SCALE);
66 }
67
68 /*
69 * calculate divider for lcd div
70 */
71 static unsigned int nuc900fb_calc_pixclk(struct nuc900fb_info *fbi,
72 unsigned long pixclk)
73 {
74 unsigned long clk = fbi->clk_rate;
75 unsigned long long div;
76
77 /* pixclk is in picseconds. our clock is in Hz*/
78 /* div = (clk * pixclk)/10^12 */
79 div = (unsigned long long)clk * pixclk;
80 div >>= 12;
81 do_div(div, 625 * 625UL * 625);
82
83 dev_dbg(fbi->dev, "pixclk %ld, divisor is %lld\n", pixclk, div);
84
85 return div;
86 }
87
88 /*
89 * Check the video params of 'var'.
90 */
91 static int nuc900fb_check_var(struct fb_var_screeninfo *var,
92 struct fb_info *info)
93 {
94 struct nuc900fb_info *fbi = info->par;
95 struct nuc900fb_mach_info *mach_info = fbi->dev->platform_data;
96 struct nuc900fb_display *display = NULL;
97 struct nuc900fb_display *default_display = mach_info->displays +
98 mach_info->default_display;
99 int i;
100
101 dev_dbg(fbi->dev, "check_var(var=%p, info=%p)\n", var, info);
102
103 /* validate x/y resolution */
104 /* choose default mode if possible */
105 if (var->xres == default_display->xres &&
106 var->yres == default_display->yres &&
107 var->bits_per_pixel == default_display->bpp)
108 display = default_display;
109 else
110 for (i = 0; i < mach_info->num_displays; i++)
111 if (var->xres == mach_info->displays[i].xres &&
112 var->yres == mach_info->displays[i].yres &&
113 var->bits_per_pixel == mach_info->displays[i].bpp) {
114 display = mach_info->displays + i;
115 break;
116 }
117
118 if (display == NULL) {
119 printk(KERN_ERR "wrong resolution or depth %dx%d at %d bit per pixel\n",
120 var->xres, var->yres, var->bits_per_pixel);
121 return -EINVAL;
122 }
123
124 /* it should be the same size as the display */
125 var->xres_virtual = display->xres;
126 var->yres_virtual = display->yres;
127 var->height = display->height;
128 var->width = display->width;
129
130 /* copy lcd settings */
131 var->pixclock = display->pixclock;
132 var->left_margin = display->left_margin;
133 var->right_margin = display->right_margin;
134 var->upper_margin = display->upper_margin;
135 var->lower_margin = display->lower_margin;
136 var->vsync_len = display->vsync_len;
137 var->hsync_len = display->hsync_len;
138
139 var->transp.offset = 0;
140 var->transp.length = 0;
141
142 fbi->regs.lcd_dccs = display->dccs;
143 fbi->regs.lcd_device_ctrl = display->devctl;
144 fbi->regs.lcd_va_fbctrl = display->fbctrl;
145 fbi->regs.lcd_va_scale = display->scale;
146
147 /* set R/G/B possions */
148 switch (var->bits_per_pixel) {
149 case 1:
150 case 2:
151 case 4:
152 case 8:
153 default:
154 var->red.offset = 0;
155 var->red.length = var->bits_per_pixel;
156 var->green = var->red;
157 var->blue = var->red;
158 break;
159 case 12:
160 var->red.length = 4;
161 var->green.length = 4;
162 var->blue.length = 4;
163 var->red.offset = 8;
164 var->green.offset = 4;
165 var->blue.offset = 0;
166 break;
167 case 16:
168 var->red.length = 5;
169 var->green.length = 6;
170 var->blue.length = 5;
171 var->red.offset = 11;
172 var->green.offset = 5;
173 var->blue.offset = 0;
174 break;
175 case 18:
176 var->red.length = 6;
177 var->green.length = 6;
178 var->blue.length = 6;
179 var->red.offset = 12;
180 var->green.offset = 6;
181 var->blue.offset = 0;
182 break;
183 case 32:
184 var->red.length = 8;
185 var->green.length = 8;
186 var->blue.length = 8;
187 var->red.offset = 16;
188 var->green.offset = 8;
189 var->blue.offset = 0;
190 break;
191 }
192
193 return 0;
194 }
195
196 /*
197 * Calculate lcd register values from var setting & save into hw
198 */
199 static void nuc900fb_calculate_lcd_regs(const struct fb_info *info,
200 struct nuc900fb_hw *regs)
201 {
202 const struct fb_var_screeninfo *var = &info->var;
203 int vtt = var->height + var->upper_margin + var->lower_margin;
204 int htt = var->width + var->left_margin + var->right_margin;
205 int hsync = var->width + var->right_margin;
206 int vsync = var->height + var->lower_margin;
207
208 regs->lcd_crtc_size = LCM_CRTC_SIZE_VTTVAL(vtt) |
209 LCM_CRTC_SIZE_HTTVAL(htt);
210 regs->lcd_crtc_dend = LCM_CRTC_DEND_VDENDVAL(var->height) |
211 LCM_CRTC_DEND_HDENDVAL(var->width);
212 regs->lcd_crtc_hr = LCM_CRTC_HR_EVAL(var->width + 5) |
213 LCM_CRTC_HR_SVAL(var->width + 1);
214 regs->lcd_crtc_hsync = LCM_CRTC_HSYNC_EVAL(hsync + var->hsync_len) |
215 LCM_CRTC_HSYNC_SVAL(hsync);
216 regs->lcd_crtc_vr = LCM_CRTC_VR_EVAL(vsync + var->vsync_len) |
217 LCM_CRTC_VR_SVAL(vsync);
218
219 }
220
221 /*
222 * Activate (set) the controller from the given framebuffer
223 * information
224 */
225 static void nuc900fb_activate_var(struct fb_info *info)
226 {
227 struct nuc900fb_info *fbi = info->par;
228 void __iomem *regs = fbi->io;
229 struct fb_var_screeninfo *var = &info->var;
230 int clkdiv;
231
232 clkdiv = nuc900fb_calc_pixclk(fbi, var->pixclock) - 1;
233 if (clkdiv < 0)
234 clkdiv = 0;
235
236 nuc900fb_calculate_lcd_regs(info, &fbi->regs);
237
238 /* set the new lcd registers*/
239
240 dev_dbg(fbi->dev, "new lcd register set:\n");
241 dev_dbg(fbi->dev, "dccs = 0x%08x\n", fbi->regs.lcd_dccs);
242 dev_dbg(fbi->dev, "dev_ctl = 0x%08x\n", fbi->regs.lcd_device_ctrl);
243 dev_dbg(fbi->dev, "crtc_size = 0x%08x\n", fbi->regs.lcd_crtc_size);
244 dev_dbg(fbi->dev, "crtc_dend = 0x%08x\n", fbi->regs.lcd_crtc_dend);
245 dev_dbg(fbi->dev, "crtc_hr = 0x%08x\n", fbi->regs.lcd_crtc_hr);
246 dev_dbg(fbi->dev, "crtc_hsync = 0x%08x\n", fbi->regs.lcd_crtc_hsync);
247 dev_dbg(fbi->dev, "crtc_vr = 0x%08x\n", fbi->regs.lcd_crtc_vr);
248
249 writel(fbi->regs.lcd_device_ctrl, regs + REG_LCM_DEV_CTRL);
250 writel(fbi->regs.lcd_crtc_size, regs + REG_LCM_CRTC_SIZE);
251 writel(fbi->regs.lcd_crtc_dend, regs + REG_LCM_CRTC_DEND);
252 writel(fbi->regs.lcd_crtc_hr, regs + REG_LCM_CRTC_HR);
253 writel(fbi->regs.lcd_crtc_hsync, regs + REG_LCM_CRTC_HSYNC);
254 writel(fbi->regs.lcd_crtc_vr, regs + REG_LCM_CRTC_VR);
255
256 /* set lcd address pointers */
257 nuc900fb_set_lcdaddr(info);
258
259 writel(fbi->regs.lcd_dccs, regs + REG_LCM_DCCS);
260 }
261
262 /*
263 * Alters the hardware state.
264 *
265 */
266 static int nuc900fb_set_par(struct fb_info *info)
267 {
268 struct fb_var_screeninfo *var = &info->var;
269
270 switch (var->bits_per_pixel) {
271 case 32:
272 case 24:
273 case 18:
274 case 16:
275 case 12:
276 info->fix.visual = FB_VISUAL_TRUECOLOR;
277 break;
278 case 1:
279 info->fix.visual = FB_VISUAL_MONO01;
280 break;
281 default:
282 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
283 break;
284 }
285
286 info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
287
288 /* activate this new configuration */
289 nuc900fb_activate_var(info);
290 return 0;
291 }
292
293 static inline unsigned int chan_to_field(unsigned int chan,
294 struct fb_bitfield *bf)
295 {
296 chan &= 0xffff;
297 chan >>= 16 - bf->length;
298 return chan << bf->offset;
299 }
300
301 static int nuc900fb_setcolreg(unsigned regno,
302 unsigned red, unsigned green, unsigned blue,
303 unsigned transp, struct fb_info *info)
304 {
305 unsigned int val;
306
307 switch (info->fix.visual) {
308 case FB_VISUAL_TRUECOLOR:
309 /* true-colour, use pseuo-palette */
310 if (regno < 16) {
311 u32 *pal = info->pseudo_palette;
312
313 val = chan_to_field(red, &info->var.red);
314 val |= chan_to_field(green, &info->var.green);
315 val |= chan_to_field(blue, &info->var.blue);
316 pal[regno] = val;
317 }
318 break;
319
320 default:
321 return 1; /* unknown type */
322 }
323 return 0;
324 }
325
326 /**
327 * nuc900fb_blank
328 *
329 */
330 static int nuc900fb_blank(int blank_mode, struct fb_info *info)
331 {
332
333 return 0;
334 }
335
336 static struct fb_ops nuc900fb_ops = {
337 .owner = THIS_MODULE,
338 .fb_check_var = nuc900fb_check_var,
339 .fb_set_par = nuc900fb_set_par,
340 .fb_blank = nuc900fb_blank,
341 .fb_setcolreg = nuc900fb_setcolreg,
342 .fb_fillrect = cfb_fillrect,
343 .fb_copyarea = cfb_copyarea,
344 .fb_imageblit = cfb_imageblit,
345 };
346
347
348 static inline void modify_gpio(void __iomem *reg,
349 unsigned long set, unsigned long mask)
350 {
351 unsigned long tmp;
352 tmp = readl(reg) & ~mask;
353 writel(tmp | set, reg);
354 }
355
356 /*
357 * Initialise LCD-related registers
358 */
359 static int nuc900fb_init_registers(struct fb_info *info)
360 {
361 struct nuc900fb_info *fbi = info->par;
362 struct nuc900fb_mach_info *mach_info = fbi->dev->platform_data;
363 void __iomem *regs = fbi->io;
364
365 /*reset the display engine*/
366 writel(0, regs + REG_LCM_DCCS);
367 writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_ENG_RST,
368 regs + REG_LCM_DCCS);
369 ndelay(100);
370 writel(readl(regs + REG_LCM_DCCS) & (~LCM_DCCS_ENG_RST),
371 regs + REG_LCM_DCCS);
372 ndelay(100);
373
374 writel(0, regs + REG_LCM_DEV_CTRL);
375
376 /* config gpio output */
377 modify_gpio(W90X900_VA_GPIO + 0x54, mach_info->gpio_dir,
378 mach_info->gpio_dir_mask);
379 modify_gpio(W90X900_VA_GPIO + 0x58, mach_info->gpio_data,
380 mach_info->gpio_data_mask);
381
382 return 0;
383 }
384
385
386 /*
387 * Alloc the SDRAM region of NUC900 for the frame buffer.
388 * The buffer should be a non-cached, non-buffered, memory region
389 * to allow palette and pixel writes without flushing the cache.
390 */
391 static int __init nuc900fb_map_video_memory(struct fb_info *info)
392 {
393 struct nuc900fb_info *fbi = info->par;
394 dma_addr_t map_dma;
395 unsigned long map_size = PAGE_ALIGN(info->fix.smem_len);
396
397 dev_dbg(fbi->dev, "nuc900fb_map_video_memory(fbi=%p) map_size %lu\n",
398 fbi, map_size);
399
400 info->screen_base = dma_alloc_writecombine(fbi->dev, map_size,
401 &map_dma, GFP_KERNEL);
402
403 if (!info->screen_base)
404 return -ENOMEM;
405
406 memset(info->screen_base, 0x00, map_size);
407 info->fix.smem_start = map_dma;
408
409 return 0;
410 }
411
412 static inline void nuc900fb_unmap_video_memory(struct fb_info *info)
413 {
414 struct nuc900fb_info *fbi = info->par;
415 dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
416 info->screen_base, info->fix.smem_start);
417 }
418
419 static irqreturn_t nuc900fb_irqhandler(int irq, void *dev_id)
420 {
421 struct nuc900fb_info *fbi = dev_id;
422 void __iomem *regs = fbi->io;
423 void __iomem *irq_base = fbi->irq_base;
424 unsigned long lcdirq = readl(regs + REG_LCM_INT_CS);
425
426 if (lcdirq & LCM_INT_CS_DISP_F_STATUS) {
427 writel(readl(irq_base) | 1<<30, irq_base);
428
429 /* wait VA_EN low */
430 if ((readl(regs + REG_LCM_DCCS) &
431 LCM_DCCS_SINGLE) == LCM_DCCS_SINGLE)
432 while ((readl(regs + REG_LCM_DCCS) &
433 LCM_DCCS_VA_EN) == LCM_DCCS_VA_EN)
434 ;
435 /* display_out-enable */
436 writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_DISP_OUT_EN,
437 regs + REG_LCM_DCCS);
438 /* va-enable*/
439 writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_VA_EN,
440 regs + REG_LCM_DCCS);
441 } else if (lcdirq & LCM_INT_CS_UNDERRUN_INT) {
442 writel(readl(irq_base) | LCM_INT_CS_UNDERRUN_INT, irq_base);
443 } else if (lcdirq & LCM_INT_CS_BUS_ERROR_INT) {
444 writel(readl(irq_base) | LCM_INT_CS_BUS_ERROR_INT, irq_base);
445 }
446
447 return IRQ_HANDLED;
448 }
449
450 #ifdef CONFIG_CPU_FREQ
451
452 static int nuc900fb_cpufreq_transition(struct notifier_block *nb,
453 unsigned long val, void *data)
454 {
455 struct nuc900fb_info *info;
456 struct fb_info *fbinfo;
457 long delta_f;
458 info = container_of(nb, struct nuc900fb_info, freq_transition);
459 fbinfo = platform_get_drvdata(to_platform_device(info->dev));
460
461 delta_f = info->clk_rate - clk_get_rate(info->clk);
462
463 if ((val == CPUFREQ_POSTCHANGE && delta_f > 0) ||
464 (val == CPUFREQ_PRECHANGE && delta_f < 0)) {
465 info->clk_rate = clk_get_rate(info->clk);
466 nuc900fb_activate_var(fbinfo);
467 }
468
469 return 0;
470 }
471
472 static inline int nuc900fb_cpufreq_register(struct nuc900fb_info *fbi)
473 {
474 fbi->freq_transition.notifier_call = nuc900fb_cpufreq_transition;
475 return cpufreq_register_notifier(&fbi->freq_transition,
476 CPUFREQ_TRANSITION_NOTIFIER);
477 }
478
479 static inline void nuc900fb_cpufreq_deregister(struct nuc900fb_info *fbi)
480 {
481 cpufreq_unregister_notifier(&fbi->freq_transition,
482 CPUFREQ_TRANSITION_NOTIFIER);
483 }
484 #else
485 static inline int nuc900fb_cpufreq_transition(struct notifier_block *nb,
486 unsigned long val, void *data)
487 {
488 return 0;
489 }
490
491 static inline int nuc900fb_cpufreq_register(struct nuc900fb_info *fbi)
492 {
493 return 0;
494 }
495
496 static inline void nuc900fb_cpufreq_deregister(struct nuc900fb_info *info)
497 {
498 }
499 #endif
500
501 static char driver_name[] = "nuc900fb";
502
503 static int __devinit nuc900fb_probe(struct platform_device *pdev)
504 {
505 struct nuc900fb_info *fbi;
506 struct nuc900fb_display *display;
507 struct fb_info *fbinfo;
508 struct nuc900fb_mach_info *mach_info;
509 struct resource *res;
510 int ret;
511 int irq;
512 int i;
513 int size;
514
515 dev_dbg(&pdev->dev, "devinit\n");
516 mach_info = pdev->dev.platform_data;
517 if (mach_info == NULL) {
518 dev_err(&pdev->dev,
519 "no platform data for lcd, cannot attach\n");
520 return -EINVAL;
521 }
522
523 if (mach_info->default_display > mach_info->num_displays) {
524 dev_err(&pdev->dev,
525 "default display No. is %d but only %d displays \n",
526 mach_info->default_display, mach_info->num_displays);
527 return -EINVAL;
528 }
529
530
531 display = mach_info->displays + mach_info->default_display;
532
533 irq = platform_get_irq(pdev, 0);
534 if (irq < 0) {
535 dev_err(&pdev->dev, "no irq for device\n");
536 return -ENOENT;
537 }
538
539 fbinfo = framebuffer_alloc(sizeof(struct nuc900fb_info), &pdev->dev);
540 if (!fbinfo)
541 return -ENOMEM;
542
543 platform_set_drvdata(pdev, fbinfo);
544
545 fbi = fbinfo->par;
546 fbi->dev = &pdev->dev;
547
548 #ifdef CONFIG_CPU_NUC950
549 fbi->drv_type = LCDDRV_NUC950;
550 #endif
551
552 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
553
554 size = (res->end - res->start) + 1;
555 fbi->mem = request_mem_region(res->start, size, pdev->name);
556 if (fbi->mem == NULL) {
557 dev_err(&pdev->dev, "failed to alloc memory region\n");
558 ret = -ENOENT;
559 goto free_fb;
560 }
561
562 fbi->io = ioremap(res->start, size);
563 if (fbi->io == NULL) {
564 dev_err(&pdev->dev, "ioremap() of lcd registers failed\n");
565 ret = -ENXIO;
566 goto release_mem_region;
567 }
568
569 fbi->irq_base = fbi->io + REG_LCM_INT_CS;
570
571
572 /* Stop the LCD */
573 writel(0, fbi->io + REG_LCM_DCCS);
574
575 /* fill the fbinfo*/
576 strcpy(fbinfo->fix.id, driver_name);
577 fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
578 fbinfo->fix.type_aux = 0;
579 fbinfo->fix.xpanstep = 0;
580 fbinfo->fix.ypanstep = 0;
581 fbinfo->fix.ywrapstep = 0;
582 fbinfo->fix.accel = FB_ACCEL_NONE;
583 fbinfo->var.nonstd = 0;
584 fbinfo->var.activate = FB_ACTIVATE_NOW;
585 fbinfo->var.accel_flags = 0;
586 fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
587 fbinfo->fbops = &nuc900fb_ops;
588 fbinfo->flags = FBINFO_FLAG_DEFAULT;
589 fbinfo->pseudo_palette = &fbi->pseudo_pal;
590
591 ret = request_irq(irq, nuc900fb_irqhandler, IRQF_DISABLED,
592 pdev->name, fbinfo);
593 if (ret) {
594 dev_err(&pdev->dev, "cannot register irq handler %d -err %d\n",
595 irq, ret);
596 ret = -EBUSY;
597 goto release_regs;
598 }
599
600 fbi->clk = clk_get(&pdev->dev, NULL);
601 if (IS_ERR(fbi->clk)) {
602 printk(KERN_ERR "nuc900-lcd:failed to get lcd clock source\n");
603 ret = PTR_ERR(fbi->clk);
604 goto release_irq;
605 }
606
607 clk_enable(fbi->clk);
608 dev_dbg(&pdev->dev, "got and enabled clock\n");
609
610 fbi->clk_rate = clk_get_rate(fbi->clk);
611
612 /* calutate the video buffer size */
613 for (i = 0; i < mach_info->num_displays; i++) {
614 unsigned long smem_len = mach_info->displays[i].xres;
615 smem_len *= mach_info->displays[i].yres;
616 smem_len *= mach_info->displays[i].bpp;
617 smem_len >>= 3;
618 if (fbinfo->fix.smem_len < smem_len)
619 fbinfo->fix.smem_len = smem_len;
620 }
621
622 /* Initialize Video Memory */
623 ret = nuc900fb_map_video_memory(fbinfo);
624 if (ret) {
625 printk(KERN_ERR "Failed to allocate video RAM: %x\n", ret);
626 goto release_clock;
627 }
628
629 dev_dbg(&pdev->dev, "got video memory\n");
630
631 fbinfo->var.xres = display->xres;
632 fbinfo->var.yres = display->yres;
633 fbinfo->var.bits_per_pixel = display->bpp;
634
635 nuc900fb_init_registers(fbinfo);
636
637 nuc900fb_check_var(&fbinfo->var, fbinfo);
638
639 ret = nuc900fb_cpufreq_register(fbi);
640 if (ret < 0) {
641 dev_err(&pdev->dev, "Failed to register cpufreq\n");
642 goto free_video_memory;
643 }
644
645 ret = register_framebuffer(fbinfo);
646 if (ret) {
647 printk(KERN_ERR "failed to register framebuffer device: %d\n",
648 ret);
649 goto free_cpufreq;
650 }
651
652 printk(KERN_INFO "fb%d: %s frame buffer device\n",
653 fbinfo->node, fbinfo->fix.id);
654
655 return 0;
656
657 free_cpufreq:
658 nuc900fb_cpufreq_deregister(fbi);
659 free_video_memory:
660 nuc900fb_unmap_video_memory(fbinfo);
661 release_clock:
662 clk_disable(fbi->clk);
663 clk_put(fbi->clk);
664 release_irq:
665 free_irq(irq, fbi);
666 release_regs:
667 iounmap(fbi->io);
668 release_mem_region:
669 release_mem_region(res->start, size);
670 free_fb:
671 framebuffer_release(fbinfo);
672 return ret;
673 }
674
675 /*
676 * shutdown the lcd controller
677 */
678 static void nuc900fb_stop_lcd(struct fb_info *info)
679 {
680 struct nuc900fb_info *fbi = info->par;
681 void __iomem *regs = fbi->io;
682
683 writel((~LCM_DCCS_DISP_INT_EN) | (~LCM_DCCS_VA_EN) | (~LCM_DCCS_OSD_EN),
684 regs + REG_LCM_DCCS);
685 }
686
687 /*
688 * Cleanup
689 */
690 static int nuc900fb_remove(struct platform_device *pdev)
691 {
692 struct fb_info *fbinfo = platform_get_drvdata(pdev);
693 struct nuc900fb_info *fbi = fbinfo->par;
694 int irq;
695
696 nuc900fb_stop_lcd(fbinfo);
697 msleep(1);
698
699 unregister_framebuffer(fbinfo);
700 nuc900fb_cpufreq_deregister(fbi);
701 nuc900fb_unmap_video_memory(fbinfo);
702
703 iounmap(fbi->io);
704
705 irq = platform_get_irq(pdev, 0);
706 free_irq(irq, fbi);
707
708 release_resource(fbi->mem);
709 kfree(fbi->mem);
710
711 platform_set_drvdata(pdev, NULL);
712 framebuffer_release(fbinfo);
713
714 return 0;
715 }
716
717 #ifdef CONFIG_PM
718
719 /*
720 * suspend and resume support for the lcd controller
721 */
722
723 static int nuc900fb_suspend(struct platform_device *dev, pm_message_t state)
724 {
725 struct fb_info *fbinfo = platform_get_drvdata(dev);
726 struct nuc900fb_info *info = fbinfo->par;
727
728 nuc900fb_stop_lcd(fbinfo);
729 msleep(1);
730 clk_disable(info->clk);
731 return 0;
732 }
733
734 static int nuc900fb_resume(struct platform_device *dev)
735 {
736 struct fb_info *fbinfo = platform_get_drvdata(dev);
737 struct nuc900fb_info *fbi = fbinfo->par;
738
739 printk(KERN_INFO "nuc900fb resume\n");
740
741 clk_enable(fbi->clk);
742 msleep(1);
743
744 nuc900fb_init_registers(fbinfo);
745 nuc900fb_activate_var(fbinfo);
746
747 return 0;
748 }
749
750 #else
751 #define nuc900fb_suspend NULL
752 #define nuc900fb_resume NULL
753 #endif
754
755 static struct platform_driver nuc900fb_driver = {
756 .probe = nuc900fb_probe,
757 .remove = nuc900fb_remove,
758 .suspend = nuc900fb_suspend,
759 .resume = nuc900fb_resume,
760 .driver = {
761 .name = "nuc900-lcd",
762 .owner = THIS_MODULE,
763 },
764 };
765
766 int __devinit nuc900fb_init(void)
767 {
768 return platform_driver_register(&nuc900fb_driver);
769 }
770
771 static void __exit nuc900fb_cleanup(void)
772 {
773 platform_driver_unregister(&nuc900fb_driver);
774 }
775
776 module_init(nuc900fb_init);
777 module_exit(nuc900fb_cleanup);
778
779 MODULE_DESCRIPTION("Framebuffer driver for the NUC900");
780 MODULE_LICENSE("GPL");