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UBI: dump stack when switching to R/O mode
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / vt8500lcdfb.c
blob0e120d67eb65074eb0f337ff9d29e10cdae134a3
1 /*
2 * linux/drivers/video/vt8500lcdfb.c
3 *
4 * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
5 *
6 * Based on skeletonfb.c and pxafb.c
7 *
8 * This software is licensed under the terms of the GNU General Public
9 * License version 2, as published by the Free Software Foundation, and
10 * may be copied, distributed, and modified under those terms.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/errno.h>
21 #include <linux/string.h>
22 #include <linux/mm.h>
23 #include <linux/slab.h>
24 #include <linux/delay.h>
25 #include <linux/fb.h>
26 #include <linux/init.h>
27 #include <linux/interrupt.h>
28 #include <linux/io.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/platform_device.h>
31 #include <linux/wait.h>
32
33 #include <mach/vt8500fb.h>
34
35 #include "vt8500lcdfb.h"
36 #include "wmt_ge_rops.h"
37
38 #define to_vt8500lcd_info(__info) container_of(__info, \
39 struct vt8500lcd_info, fb)
40
41 static int vt8500lcd_set_par(struct fb_info *info)
42 {
43 struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
44 int reg_bpp = 5; /* 16bpp */
45 int i;
46 unsigned long control0;
47
48 if (!fbi)
49 return -EINVAL;
50
51 if (info->var.bits_per_pixel <= 8) {
52 /* palettized */
53 info->var.red.offset = 0;
54 info->var.red.length = info->var.bits_per_pixel;
55 info->var.red.msb_right = 0;
56
57 info->var.green.offset = 0;
58 info->var.green.length = info->var.bits_per_pixel;
59 info->var.green.msb_right = 0;
60
61 info->var.blue.offset = 0;
62 info->var.blue.length = info->var.bits_per_pixel;
63 info->var.blue.msb_right = 0;
64
65 info->var.transp.offset = 0;
66 info->var.transp.length = 0;
67 info->var.transp.msb_right = 0;
68
69 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
70 info->fix.line_length = info->var.xres_virtual /
71 (8/info->var.bits_per_pixel);
72 } else {
73 /* non-palettized */
74 info->var.transp.offset = 0;
75 info->var.transp.length = 0;
76 info->var.transp.msb_right = 0;
77
78 if (info->var.bits_per_pixel == 16) {
79 /* RGB565 */
80 info->var.red.offset = 11;
81 info->var.red.length = 5;
82 info->var.red.msb_right = 0;
83 info->var.green.offset = 5;
84 info->var.green.length = 6;
85 info->var.green.msb_right = 0;
86 info->var.blue.offset = 0;
87 info->var.blue.length = 5;
88 info->var.blue.msb_right = 0;
89 } else {
90 /* Equal depths per channel */
91 info->var.red.offset = info->var.bits_per_pixel
92 * 2 / 3;
93 info->var.red.length = info->var.bits_per_pixel / 3;
94 info->var.red.msb_right = 0;
95 info->var.green.offset = info->var.bits_per_pixel / 3;
96 info->var.green.length = info->var.bits_per_pixel / 3;
97 info->var.green.msb_right = 0;
98 info->var.blue.offset = 0;
99 info->var.blue.length = info->var.bits_per_pixel / 3;
100 info->var.blue.msb_right = 0;
101 }
102
103 info->fix.visual = FB_VISUAL_TRUECOLOR;
104 info->fix.line_length = info->var.bits_per_pixel > 16 ?
105 info->var.xres_virtual << 2 :
106 info->var.xres_virtual << 1;
107 }
108
109 for (i = 0; i < 8; i++) {
110 if (bpp_values[i] == info->var.bits_per_pixel) {
111 reg_bpp = i;
112 continue;
113 }
114 }
115
116 control0 = readl(fbi->regbase) & ~0xf;
117 writel(0, fbi->regbase);
118 while (readl(fbi->regbase + 0x38) & 0x10)
119 /* wait */;
120 writel((((info->var.hsync_len - 1) & 0x3f) << 26)
121 | ((info->var.left_margin & 0xff) << 18)
122 | (((info->var.xres - 1) & 0x3ff) << 8)
123 | (info->var.right_margin & 0xff), fbi->regbase + 0x4);
124 writel((((info->var.vsync_len - 1) & 0x3f) << 26)
125 | ((info->var.upper_margin & 0xff) << 18)
126 | (((info->var.yres - 1) & 0x3ff) << 8)
127 | (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
128 writel((((info->var.yres - 1) & 0x400) << 2)
129 | ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
130 writel(0x80000000, fbi->regbase + 0x20);
131 writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);
132
133 return 0;
134 }
135
136 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
137 {
138 chan &= 0xffff;
139 chan >>= 16 - bf->length;
140 return chan << bf->offset;
141 }
142
143 static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
144 unsigned blue, unsigned transp,
145 struct fb_info *info) {
146 struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
147 int ret = 1;
148 unsigned int val;
149 if (regno >= 256)
150 return -EINVAL;
151
152 if (info->var.grayscale)
153 red = green = blue =
154 (19595 * red + 38470 * green + 7471 * blue) >> 16;
155
156 switch (fbi->fb.fix.visual) {
157 case FB_VISUAL_TRUECOLOR:
158 if (regno < 16) {
159 u32 *pal = fbi->fb.pseudo_palette;
160
161 val = chan_to_field(red, &fbi->fb.var.red);
162 val |= chan_to_field(green, &fbi->fb.var.green);
163 val |= chan_to_field(blue, &fbi->fb.var.blue);
164
165 pal[regno] = val;
166 ret = 0;
167 }
168 break;
169
170 case FB_VISUAL_STATIC_PSEUDOCOLOR:
171 case FB_VISUAL_PSEUDOCOLOR:
172 writew((red & 0xf800)
173 | ((green >> 5) & 0x7e0)
174 | ((blue >> 11) & 0x1f),
175 fbi->palette_cpu + sizeof(u16) * regno);
176 break;
177 }
178
179 return ret;
180 }
181
182 static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
183 unsigned long arg)
184 {
185 int ret = 0;
186 struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
187
188 if (cmd == FBIO_WAITFORVSYNC) {
189 /* Unmask End of Frame interrupt */
190 writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
191 ret = wait_event_interruptible_timeout(fbi->wait,
192 readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
193 /* Mask back to reduce unwanted interrupt traffic */
194 writel(0xffffffff, fbi->regbase + 0x3c);
195 if (ret < 0)
196 return ret;
197 if (ret == 0)
198 return -ETIMEDOUT;
199 }
200
201 return ret;
202 }
203
204 static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
205 struct fb_info *info)
206 {
207 unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
208 unsigned off = pixlen * var->xoffset
209 + info->fix.line_length * var->yoffset;
210 struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
211
212 writel((1 << 31)
213 | (((var->xres_virtual - var->xres) * pixlen / 4) << 20)
214 | (off >> 2), fbi->regbase + 0x20);
215 return 0;
216 }
217
218 /*
219 * vt8500lcd_blank():
220 * Blank the display by setting all palette values to zero. Note,
221 * True Color modes do not really use the palette, so this will not
222 * blank the display in all modes.
223 */
224 static int vt8500lcd_blank(int blank, struct fb_info *info)
225 {
226 int i;
227
228 switch (blank) {
229 case FB_BLANK_POWERDOWN:
230 case FB_BLANK_VSYNC_SUSPEND:
231 case FB_BLANK_HSYNC_SUSPEND:
232 case FB_BLANK_NORMAL:
233 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
234 info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
235 for (i = 0; i < 256; i++)
236 vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
237 case FB_BLANK_UNBLANK:
238 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
239 info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
240 fb_set_cmap(&info->cmap, info);
241 }
242 return 0;
243 }
244
245 static struct fb_ops vt8500lcd_ops = {
246 .owner = THIS_MODULE,
247 .fb_set_par = vt8500lcd_set_par,
248 .fb_setcolreg = vt8500lcd_setcolreg,
249 .fb_fillrect = wmt_ge_fillrect,
250 .fb_copyarea = wmt_ge_copyarea,
251 .fb_imageblit = sys_imageblit,
252 .fb_sync = wmt_ge_sync,
253 .fb_ioctl = vt8500lcd_ioctl,
254 .fb_pan_display = vt8500lcd_pan_display,
255 .fb_blank = vt8500lcd_blank,
256 };
257
258 static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
259 {
260 struct vt8500lcd_info *fbi = dev_id;
261
262 if (readl(fbi->regbase + 0x38) & (1 << 3))
263 wake_up_interruptible(&fbi->wait);
264
265 writel(0xffffffff, fbi->regbase + 0x38);
266 return IRQ_HANDLED;
267 }
268
269 static int __devinit vt8500lcd_probe(struct platform_device *pdev)
270 {
271 struct vt8500lcd_info *fbi;
272 struct resource *res;
273 struct vt8500fb_platform_data *pdata = pdev->dev.platform_data;
274 void *addr;
275 int irq, ret;
276
277 ret = -ENOMEM;
278 fbi = NULL;
279
280 fbi = kzalloc(sizeof(struct vt8500lcd_info) + sizeof(u32) * 16,
281 GFP_KERNEL);
282 if (!fbi) {
283 dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
284 ret = -ENOMEM;
285 goto failed;
286 }
287
288 strcpy(fbi->fb.fix.id, "VT8500 LCD");
289
290 fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
291 fbi->fb.fix.xpanstep = 0;
292 fbi->fb.fix.ypanstep = 1;
293 fbi->fb.fix.ywrapstep = 0;
294 fbi->fb.fix.accel = FB_ACCEL_NONE;
295
296 fbi->fb.var.nonstd = 0;
297 fbi->fb.var.activate = FB_ACTIVATE_NOW;
298 fbi->fb.var.height = -1;
299 fbi->fb.var.width = -1;
300 fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;
301
302 fbi->fb.fbops = &vt8500lcd_ops;
303 fbi->fb.flags = FBINFO_DEFAULT
304 | FBINFO_HWACCEL_COPYAREA
305 | FBINFO_HWACCEL_FILLRECT
306 | FBINFO_HWACCEL_YPAN
307 | FBINFO_VIRTFB
308 | FBINFO_PARTIAL_PAN_OK;
309 fbi->fb.node = -1;
310
311 addr = fbi;
312 addr = addr + sizeof(struct vt8500lcd_info);
313 fbi->fb.pseudo_palette = addr;
314
315 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
316 if (res == NULL) {
317 dev_err(&pdev->dev, "no I/O memory resource defined\n");
318 ret = -ENODEV;
319 goto failed_fbi;
320 }
321
322 res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
323 if (res == NULL) {
324 dev_err(&pdev->dev, "failed to request I/O memory\n");
325 ret = -EBUSY;
326 goto failed_fbi;
327 }
328
329 fbi->regbase = ioremap(res->start, resource_size(res));
330 if (fbi->regbase == NULL) {
331 dev_err(&pdev->dev, "failed to map I/O memory\n");
332 ret = -EBUSY;
333 goto failed_free_res;
334 }
335
336 fbi->fb.fix.smem_start = pdata->video_mem_phys;
337 fbi->fb.fix.smem_len = pdata->video_mem_len;
338 fbi->fb.screen_base = pdata->video_mem_virt;
339
340 fbi->palette_size = PAGE_ALIGN(512);
341 fbi->palette_cpu = dma_alloc_coherent(&pdev->dev,
342 fbi->palette_size,
343 &fbi->palette_phys,
344 GFP_KERNEL);
345 if (fbi->palette_cpu == NULL) {
346 dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
347 ret = -ENOMEM;
348 goto failed_free_io;
349 }
350
351 irq = platform_get_irq(pdev, 0);
352 if (irq < 0) {
353 dev_err(&pdev->dev, "no IRQ defined\n");
354 ret = -ENODEV;
355 goto failed_free_palette;
356 }
357
358 ret = request_irq(irq, vt8500lcd_handle_irq, IRQF_DISABLED, "LCD", fbi);
359 if (ret) {
360 dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
361 ret = -EBUSY;
362 goto failed_free_palette;
363 }
364
365 init_waitqueue_head(&fbi->wait);
366
367 if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
368 dev_err(&pdev->dev, "Failed to allocate color map\n");
369 ret = -ENOMEM;
370 goto failed_free_irq;
371 }
372
373 fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
374 fbi->fb.var.bits_per_pixel = pdata->bpp;
375 fbi->fb.var.xres_virtual = pdata->xres_virtual;
376 fbi->fb.var.yres_virtual = pdata->yres_virtual;
377
378 ret = vt8500lcd_set_par(&fbi->fb);
379 if (ret) {
380 dev_err(&pdev->dev, "Failed to set parameters\n");
381 goto failed_free_cmap;
382 }
383
384 writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
385 writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);
386
387 platform_set_drvdata(pdev, fbi);
388
389 ret = register_framebuffer(&fbi->fb);
390 if (ret < 0) {
391 dev_err(&pdev->dev,
392 "Failed to register framebuffer device: %d\n", ret);
393 goto failed_free_cmap;
394 }
395
396 /*
397 * Ok, now enable the LCD controller
398 */
399 writel(readl(fbi->regbase) | 1, fbi->regbase);
400
401 return 0;
402
403 failed_free_cmap:
404 if (fbi->fb.cmap.len)
405 fb_dealloc_cmap(&fbi->fb.cmap);
406 failed_free_irq:
407 free_irq(irq, fbi);
408 failed_free_palette:
409 dma_free_coherent(&pdev->dev, fbi->palette_size,
410 fbi->palette_cpu, fbi->palette_phys);
411 failed_free_io:
412 iounmap(fbi->regbase);
413 failed_free_res:
414 release_mem_region(res->start, resource_size(res));
415 failed_fbi:
416 platform_set_drvdata(pdev, NULL);
417 kfree(fbi);
418 failed:
419 return ret;
420 }
421
422 static int __devexit vt8500lcd_remove(struct platform_device *pdev)
423 {
424 struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
425 struct resource *res;
426 int irq;
427
428 unregister_framebuffer(&fbi->fb);
429
430 writel(0, fbi->regbase);
431
432 if (fbi->fb.cmap.len)
433 fb_dealloc_cmap(&fbi->fb.cmap);
434
435 irq = platform_get_irq(pdev, 0);
436 free_irq(irq, fbi);
437
438 dma_free_coherent(&pdev->dev, fbi->palette_size,
439 fbi->palette_cpu, fbi->palette_phys);
440
441 iounmap(fbi->regbase);
442
443 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
444 release_mem_region(res->start, resource_size(res));
445
446 kfree(fbi);
447
448 return 0;
449 }
450
451 static struct platform_driver vt8500lcd_driver = {
452 .probe = vt8500lcd_probe,
453 .remove = __devexit_p(vt8500lcd_remove),
454 .driver = {
455 .owner = THIS_MODULE,
456 .name = "vt8500-lcd",
457 },
458 };
459
460 static int __init vt8500lcd_init(void)
461 {
462 return platform_driver_register(&vt8500lcd_driver);
463 }
464
465 static void __exit vt8500lcd_exit(void)
466 {
467 platform_driver_unregister(&vt8500lcd_driver);
468 }
469
470 module_init(vt8500lcd_init);
471 module_exit(vt8500lcd_exit);
472
473 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
474 MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
475 MODULE_LICENSE("GPL");
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