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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 | ||
218 | static struct fb_ops vt8500lcd_ops = { | |
219 | .owner = THIS_MODULE, | |
220 | .fb_set_par = vt8500lcd_set_par, | |
221 | .fb_setcolreg = vt8500lcd_setcolreg, | |
222 | .fb_fillrect = wmt_ge_fillrect, | |
223 | .fb_copyarea = wmt_ge_copyarea, | |
224 | .fb_imageblit = sys_imageblit, | |
225 | .fb_sync = wmt_ge_sync, | |
226 | .fb_ioctl = vt8500lcd_ioctl, | |
227 | .fb_pan_display = vt8500lcd_pan_display, | |
228 | }; | |
229 | ||
230 | static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id) | |
231 | { | |
232 | struct vt8500lcd_info *fbi = dev_id; | |
233 | ||
234 | if (readl(fbi->regbase + 0x38) & (1 << 3)) | |
235 | wake_up_interruptible(&fbi->wait); | |
236 | ||
237 | writel(0xffffffff, fbi->regbase + 0x38); | |
238 | return IRQ_HANDLED; | |
239 | } | |
240 | ||
241 | static int __devinit vt8500lcd_probe(struct platform_device *pdev) | |
242 | { | |
243 | struct vt8500lcd_info *fbi; | |
244 | struct resource *res; | |
245 | struct vt8500fb_platform_data *pdata = pdev->dev.platform_data; | |
246 | void *addr; | |
247 | int irq, ret; | |
248 | ||
249 | ret = -ENOMEM; | |
250 | fbi = NULL; | |
251 | ||
252 | fbi = kzalloc(sizeof(struct vt8500lcd_info) + sizeof(u32) * 16, | |
253 | GFP_KERNEL); | |
254 | if (!fbi) { | |
255 | dev_err(&pdev->dev, "Failed to initialize framebuffer device\n"); | |
256 | ret = -ENOMEM; | |
257 | goto failed; | |
258 | } | |
259 | ||
260 | strcpy(fbi->fb.fix.id, "VT8500 LCD"); | |
261 | ||
262 | fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS; | |
263 | fbi->fb.fix.xpanstep = 0; | |
264 | fbi->fb.fix.ypanstep = 1; | |
265 | fbi->fb.fix.ywrapstep = 0; | |
266 | fbi->fb.fix.accel = FB_ACCEL_NONE; | |
267 | ||
268 | fbi->fb.var.nonstd = 0; | |
269 | fbi->fb.var.activate = FB_ACTIVATE_NOW; | |
270 | fbi->fb.var.height = -1; | |
271 | fbi->fb.var.width = -1; | |
272 | fbi->fb.var.vmode = FB_VMODE_NONINTERLACED; | |
273 | ||
274 | fbi->fb.fbops = &vt8500lcd_ops; | |
275 | fbi->fb.flags = FBINFO_DEFAULT | |
276 | | FBINFO_HWACCEL_COPYAREA | |
277 | | FBINFO_HWACCEL_FILLRECT | |
278 | | FBINFO_HWACCEL_YPAN | |
279 | | FBINFO_VIRTFB | |
280 | | FBINFO_PARTIAL_PAN_OK; | |
281 | fbi->fb.node = -1; | |
282 | ||
283 | addr = fbi; | |
284 | addr = addr + sizeof(struct vt8500lcd_info); | |
285 | fbi->fb.pseudo_palette = addr; | |
286 | ||
287 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
288 | if (res == NULL) { | |
289 | dev_err(&pdev->dev, "no I/O memory resource defined\n"); | |
290 | ret = -ENODEV; | |
291 | goto failed_fbi; | |
292 | } | |
293 | ||
294 | res = request_mem_region(res->start, resource_size(res), "vt8500lcd"); | |
295 | if (res == NULL) { | |
296 | dev_err(&pdev->dev, "failed to request I/O memory\n"); | |
297 | ret = -EBUSY; | |
298 | goto failed_fbi; | |
299 | } | |
300 | ||
301 | fbi->regbase = ioremap(res->start, resource_size(res)); | |
302 | if (fbi->regbase == NULL) { | |
303 | dev_err(&pdev->dev, "failed to map I/O memory\n"); | |
304 | ret = -EBUSY; | |
305 | goto failed_free_res; | |
306 | } | |
307 | ||
308 | fbi->fb.fix.smem_start = pdata->video_mem_phys; | |
309 | fbi->fb.fix.smem_len = pdata->video_mem_len; | |
310 | fbi->fb.screen_base = pdata->video_mem_virt; | |
311 | ||
312 | fbi->palette_size = PAGE_ALIGN(512); | |
313 | fbi->palette_cpu = dma_alloc_coherent(&pdev->dev, | |
314 | fbi->palette_size, | |
315 | &fbi->palette_phys, | |
316 | GFP_KERNEL); | |
317 | if (fbi->palette_cpu == NULL) { | |
318 | dev_err(&pdev->dev, "Failed to allocate palette buffer\n"); | |
319 | ret = -ENOMEM; | |
320 | goto failed_free_io; | |
321 | } | |
322 | ||
323 | irq = platform_get_irq(pdev, 0); | |
324 | if (irq < 0) { | |
325 | dev_err(&pdev->dev, "no IRQ defined\n"); | |
326 | ret = -ENODEV; | |
327 | goto failed_free_palette; | |
328 | } | |
329 | ||
330 | ret = request_irq(irq, vt8500lcd_handle_irq, IRQF_DISABLED, "LCD", fbi); | |
331 | if (ret) { | |
332 | dev_err(&pdev->dev, "request_irq failed: %d\n", ret); | |
333 | ret = -EBUSY; | |
334 | goto failed_free_palette; | |
335 | } | |
336 | ||
337 | init_waitqueue_head(&fbi->wait); | |
338 | ||
339 | if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) { | |
340 | dev_err(&pdev->dev, "Failed to allocate color map\n"); | |
341 | ret = -ENOMEM; | |
342 | goto failed_free_irq; | |
343 | } | |
344 | ||
345 | fb_videomode_to_var(&fbi->fb.var, &pdata->mode); | |
346 | fbi->fb.var.bits_per_pixel = pdata->bpp; | |
347 | fbi->fb.var.xres_virtual = pdata->xres_virtual; | |
348 | fbi->fb.var.yres_virtual = pdata->yres_virtual; | |
349 | ||
350 | ret = vt8500lcd_set_par(&fbi->fb); | |
351 | if (ret) { | |
352 | dev_err(&pdev->dev, "Failed to set parameters\n"); | |
353 | goto failed_free_cmap; | |
354 | } | |
355 | ||
356 | writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c); | |
357 | writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18); | |
358 | ||
359 | platform_set_drvdata(pdev, fbi); | |
360 | ||
361 | ret = register_framebuffer(&fbi->fb); | |
362 | if (ret < 0) { | |
363 | dev_err(&pdev->dev, | |
364 | "Failed to register framebuffer device: %d\n", ret); | |
365 | goto failed_free_cmap; | |
366 | } | |
367 | ||
368 | /* | |
369 | * Ok, now enable the LCD controller | |
370 | */ | |
371 | writel(readl(fbi->regbase) | 1, fbi->regbase); | |
372 | ||
373 | return 0; | |
374 | ||
375 | failed_free_cmap: | |
376 | if (fbi->fb.cmap.len) | |
377 | fb_dealloc_cmap(&fbi->fb.cmap); | |
378 | failed_free_irq: | |
379 | free_irq(irq, fbi); | |
380 | failed_free_palette: | |
381 | dma_free_coherent(&pdev->dev, fbi->palette_size, | |
382 | fbi->palette_cpu, fbi->palette_phys); | |
383 | failed_free_io: | |
384 | iounmap(fbi->regbase); | |
385 | failed_free_res: | |
386 | release_mem_region(res->start, resource_size(res)); | |
387 | failed_fbi: | |
388 | platform_set_drvdata(pdev, NULL); | |
389 | kfree(fbi); | |
390 | failed: | |
391 | return ret; | |
392 | } | |
393 | ||
394 | static int __devexit vt8500lcd_remove(struct platform_device *pdev) | |
395 | { | |
396 | struct vt8500lcd_info *fbi = platform_get_drvdata(pdev); | |
397 | struct resource *res; | |
398 | int irq; | |
399 | ||
400 | unregister_framebuffer(&fbi->fb); | |
401 | ||
402 | writel(0, fbi->regbase); | |
403 | ||
404 | if (fbi->fb.cmap.len) | |
405 | fb_dealloc_cmap(&fbi->fb.cmap); | |
406 | ||
407 | irq = platform_get_irq(pdev, 0); | |
408 | free_irq(irq, fbi); | |
409 | ||
410 | dma_free_coherent(&pdev->dev, fbi->palette_size, | |
411 | fbi->palette_cpu, fbi->palette_phys); | |
412 | ||
413 | iounmap(fbi->regbase); | |
414 | ||
415 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
416 | release_mem_region(res->start, resource_size(res)); | |
417 | ||
418 | kfree(fbi); | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
423 | static struct platform_driver vt8500lcd_driver = { | |
424 | .probe = vt8500lcd_probe, | |
425 | .remove = __devexit_p(vt8500lcd_remove), | |
426 | .driver = { | |
427 | .owner = THIS_MODULE, | |
428 | .name = "vt8500-lcd", | |
429 | }, | |
430 | }; | |
431 | ||
432 | static int __init vt8500lcd_init(void) | |
433 | { | |
434 | return platform_driver_register(&vt8500lcd_driver); | |
435 | } | |
436 | ||
437 | static void __exit vt8500lcd_exit(void) | |
438 | { | |
439 | platform_driver_unregister(&vt8500lcd_driver); | |
440 | } | |
441 | ||
442 | module_init(vt8500lcd_init); | |
443 | module_exit(vt8500lcd_exit); | |
444 | ||
445 | MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>"); | |
446 | MODULE_DESCRIPTION("LCD controller driver for VIA VT8500"); | |
447 | MODULE_LICENSE("GPL"); |