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d6ff7d0f AC |
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 | ||
e41f1a98 AC |
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 | ||
d6ff7d0f AC |
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, | |
e41f1a98 | 255 | .fb_blank = vt8500lcd_blank, |
d6ff7d0f AC |
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"); |