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10#include <linux/delay.h>
11#include <linux/dma-mapping.h>
12#include <linux/errno.h>
13#include <linux/fb.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/mm.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <linux/slab.h>
22#include <linux/string.h>
23#include <linux/wait.h>
24#include <video/of_display_timing.h>
25
26#include "vt8500lcdfb.h"
27#include "wmt_ge_rops.h"
28
29#ifdef CONFIG_OF
30#include <linux/of.h>
31#include <linux/of_fdt.h>
32#include <linux/memblock.h>
33#endif
34
35
36#define to_vt8500lcd_info(__info) container_of(__info, \
37 struct vt8500lcd_info, fb)
38
39static int vt8500lcd_set_par(struct fb_info *info)
40{
41 struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
42 int reg_bpp = 5;
43 int i;
44 unsigned long control0;
45
46 if (!fbi)
47 return -EINVAL;
48
49 if (info->var.bits_per_pixel <= 8) {
50
51 info->var.red.offset = 0;
52 info->var.red.length = info->var.bits_per_pixel;
53 info->var.red.msb_right = 0;
54
55 info->var.green.offset = 0;
56 info->var.green.length = info->var.bits_per_pixel;
57 info->var.green.msb_right = 0;
58
59 info->var.blue.offset = 0;
60 info->var.blue.length = info->var.bits_per_pixel;
61 info->var.blue.msb_right = 0;
62
63 info->var.transp.offset = 0;
64 info->var.transp.length = 0;
65 info->var.transp.msb_right = 0;
66
67 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
68 info->fix.line_length = info->var.xres_virtual /
69 (8/info->var.bits_per_pixel);
70 } else {
71
72 info->var.transp.offset = 0;
73 info->var.transp.length = 0;
74 info->var.transp.msb_right = 0;
75
76 if (info->var.bits_per_pixel == 16) {
77
78 info->var.red.offset = 11;
79 info->var.red.length = 5;
80 info->var.red.msb_right = 0;
81 info->var.green.offset = 5;
82 info->var.green.length = 6;
83 info->var.green.msb_right = 0;
84 info->var.blue.offset = 0;
85 info->var.blue.length = 5;
86 info->var.blue.msb_right = 0;
87 } else {
88
89 info->var.red.offset = info->var.bits_per_pixel
90 * 2 / 3;
91 info->var.red.length = info->var.bits_per_pixel / 3;
92 info->var.red.msb_right = 0;
93 info->var.green.offset = info->var.bits_per_pixel / 3;
94 info->var.green.length = info->var.bits_per_pixel / 3;
95 info->var.green.msb_right = 0;
96 info->var.blue.offset = 0;
97 info->var.blue.length = info->var.bits_per_pixel / 3;
98 info->var.blue.msb_right = 0;
99 }
100
101 info->fix.visual = FB_VISUAL_TRUECOLOR;
102 info->fix.line_length = info->var.bits_per_pixel > 16 ?
103 info->var.xres_virtual << 2 :
104 info->var.xres_virtual << 1;
105 }
106
107 for (i = 0; i < 8; i++) {
108 if (bpp_values[i] == info->var.bits_per_pixel)
109 reg_bpp = i;
110 }
111
112 control0 = readl(fbi->regbase) & ~0xf;
113 writel(0, fbi->regbase);
114 while (readl(fbi->regbase + 0x38) & 0x10)
115 ;
116 writel((((info->var.hsync_len - 1) & 0x3f) << 26)
117 | ((info->var.left_margin & 0xff) << 18)
118 | (((info->var.xres - 1) & 0x3ff) << 8)
119 | (info->var.right_margin & 0xff), fbi->regbase + 0x4);
120 writel((((info->var.vsync_len - 1) & 0x3f) << 26)
121 | ((info->var.upper_margin & 0xff) << 18)
122 | (((info->var.yres - 1) & 0x3ff) << 8)
123 | (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
124 writel((((info->var.yres - 1) & 0x400) << 2)
125 | ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
126 writel(0x80000000, fbi->regbase + 0x20);
127 writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);
128
129 return 0;
130}
131
132static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
133{
134 chan &= 0xffff;
135 chan >>= 16 - bf->length;
136 return chan << bf->offset;
137}
138
139static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
140 unsigned blue, unsigned transp,
141 struct fb_info *info) {
142 struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
143 int ret = 1;
144 unsigned int val;
145 if (regno >= 256)
146 return -EINVAL;
147
148 if (info->var.grayscale)
149 red = green = blue =
150 (19595 * red + 38470 * green + 7471 * blue) >> 16;
151
152 switch (fbi->fb.fix.visual) {
153 case FB_VISUAL_TRUECOLOR:
154 if (regno < 16) {
155 u32 *pal = fbi->fb.pseudo_palette;
156
157 val = chan_to_field(red, &fbi->fb.var.red);
158 val |= chan_to_field(green, &fbi->fb.var.green);
159 val |= chan_to_field(blue, &fbi->fb.var.blue);
160
161 pal[regno] = val;
162 ret = 0;
163 }
164 break;
165
166 case FB_VISUAL_STATIC_PSEUDOCOLOR:
167 case FB_VISUAL_PSEUDOCOLOR:
168 writew((red & 0xf800)
169 | ((green >> 5) & 0x7e0)
170 | ((blue >> 11) & 0x1f),
171 fbi->palette_cpu + sizeof(u16) * regno);
172 break;
173 }
174
175 return ret;
176}
177
178static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
179 unsigned long arg)
180{
181 int ret = 0;
182 struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
183
184 if (cmd == FBIO_WAITFORVSYNC) {
185
186 writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
187 ret = wait_event_interruptible_timeout(fbi->wait,
188 readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
189
190 writel(0xffffffff, fbi->regbase + 0x3c);
191 if (ret < 0)
192 return ret;
193 if (ret == 0)
194 return -ETIMEDOUT;
195 }
196
197 return ret;
198}
199
200static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
201 struct fb_info *info)
202{
203 unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
204 unsigned off = pixlen * var->xoffset
205 + info->fix.line_length * var->yoffset;
206 struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
207
208 writel((1 << 31)
209 | (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
210 | (off >> 2), fbi->regbase + 0x20);
211 return 0;
212}
213
214
215
216
217
218
219
220static int vt8500lcd_blank(int blank, struct fb_info *info)
221{
222 int i;
223
224 switch (blank) {
225 case FB_BLANK_POWERDOWN:
226 case FB_BLANK_VSYNC_SUSPEND:
227 case FB_BLANK_HSYNC_SUSPEND:
228 case FB_BLANK_NORMAL:
229 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
230 info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
231 for (i = 0; i < 256; i++)
232 vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
233 case FB_BLANK_UNBLANK:
234 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
235 info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
236 fb_set_cmap(&info->cmap, info);
237 }
238 return 0;
239}
240
241static struct fb_ops vt8500lcd_ops = {
242 .owner = THIS_MODULE,
243 .fb_set_par = vt8500lcd_set_par,
244 .fb_setcolreg = vt8500lcd_setcolreg,
245 .fb_fillrect = wmt_ge_fillrect,
246 .fb_copyarea = wmt_ge_copyarea,
247 .fb_imageblit = sys_imageblit,
248 .fb_sync = wmt_ge_sync,
249 .fb_ioctl = vt8500lcd_ioctl,
250 .fb_pan_display = vt8500lcd_pan_display,
251 .fb_blank = vt8500lcd_blank,
252};
253
254static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
255{
256 struct vt8500lcd_info *fbi = dev_id;
257
258 if (readl(fbi->regbase + 0x38) & (1 << 3))
259 wake_up_interruptible(&fbi->wait);
260
261 writel(0xffffffff, fbi->regbase + 0x38);
262 return IRQ_HANDLED;
263}
264
265static int vt8500lcd_probe(struct platform_device *pdev)
266{
267 struct vt8500lcd_info *fbi;
268 struct resource *res;
269 struct display_timings *disp_timing;
270 void *addr;
271 int irq, ret;
272
273 struct fb_videomode of_mode;
274 u32 bpp;
275 dma_addr_t fb_mem_phys;
276 unsigned long fb_mem_len;
277 void *fb_mem_virt;
278
279 ret = -ENOMEM;
280 fbi = NULL;
281
282 fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
283 + sizeof(u32) * 16, GFP_KERNEL);
284 if (!fbi)
285 return -ENOMEM;
286
287 strcpy(fbi->fb.fix.id, "VT8500 LCD");
288
289 fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
290 fbi->fb.fix.xpanstep = 0;
291 fbi->fb.fix.ypanstep = 1;
292 fbi->fb.fix.ywrapstep = 0;
293 fbi->fb.fix.accel = FB_ACCEL_NONE;
294
295 fbi->fb.var.nonstd = 0;
296 fbi->fb.var.activate = FB_ACTIVATE_NOW;
297 fbi->fb.var.height = -1;
298 fbi->fb.var.width = -1;
299 fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;
300
301 fbi->fb.fbops = &vt8500lcd_ops;
302 fbi->fb.flags = FBINFO_DEFAULT
303 | FBINFO_HWACCEL_COPYAREA
304 | FBINFO_HWACCEL_FILLRECT
305 | FBINFO_HWACCEL_YPAN
306 | FBINFO_VIRTFB
307 | FBINFO_PARTIAL_PAN_OK;
308 fbi->fb.node = -1;
309
310 addr = fbi;
311 addr = addr + sizeof(struct vt8500lcd_info);
312 fbi->fb.pseudo_palette = addr;
313
314 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
315 if (res == NULL) {
316 dev_err(&pdev->dev, "no I/O memory resource defined\n");
317 return -ENODEV;
318 }
319
320 res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
321 if (res == NULL) {
322 dev_err(&pdev->dev, "failed to request I/O memory\n");
323 return -EBUSY;
324 }
325
326 fbi->regbase = ioremap(res->start, resource_size(res));
327 if (fbi->regbase == NULL) {
328 dev_err(&pdev->dev, "failed to map I/O memory\n");
329 ret = -EBUSY;
330 goto failed_free_res;
331 }
332
333 disp_timing = of_get_display_timings(pdev->dev.of_node);
334 if (!disp_timing) {
335 ret = -EINVAL;
336 goto failed_free_io;
337 }
338
339 ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode,
340 OF_USE_NATIVE_MODE);
341 if (ret)
342 goto failed_free_io;
343
344 ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
345 if (ret)
346 goto failed_free_io;
347
348
349 fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
350 fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
351 GFP_KERNEL);
352 if (!fb_mem_virt) {
353 pr_err("%s: Failed to allocate framebuffer\n", __func__);
354 ret = -ENOMEM;
355 goto failed_free_io;
356 }
357
358 fbi->fb.fix.smem_start = fb_mem_phys;
359 fbi->fb.fix.smem_len = fb_mem_len;
360 fbi->fb.screen_base = fb_mem_virt;
361
362 fbi->palette_size = PAGE_ALIGN(512);
363 fbi->palette_cpu = dma_alloc_coherent(&pdev->dev,
364 fbi->palette_size,
365 &fbi->palette_phys,
366 GFP_KERNEL);
367 if (fbi->palette_cpu == NULL) {
368 dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
369 ret = -ENOMEM;
370 goto failed_free_io;
371 }
372
373 irq = platform_get_irq(pdev, 0);
374 if (irq < 0) {
375 dev_err(&pdev->dev, "no IRQ defined\n");
376 ret = -ENODEV;
377 goto failed_free_palette;
378 }
379
380 ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
381 if (ret) {
382 dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
383 ret = -EBUSY;
384 goto failed_free_palette;
385 }
386
387 init_waitqueue_head(&fbi->wait);
388
389 if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
390 dev_err(&pdev->dev, "Failed to allocate color map\n");
391 ret = -ENOMEM;
392 goto failed_free_irq;
393 }
394
395 fb_videomode_to_var(&fbi->fb.var, &of_mode);
396
397 fbi->fb.var.xres_virtual = of_mode.xres;
398 fbi->fb.var.yres_virtual = of_mode.yres * 2;
399 fbi->fb.var.bits_per_pixel = bpp;
400
401 ret = vt8500lcd_set_par(&fbi->fb);
402 if (ret) {
403 dev_err(&pdev->dev, "Failed to set parameters\n");
404 goto failed_free_cmap;
405 }
406
407 writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
408 writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);
409
410 platform_set_drvdata(pdev, fbi);
411
412 ret = register_framebuffer(&fbi->fb);
413 if (ret < 0) {
414 dev_err(&pdev->dev,
415 "Failed to register framebuffer device: %d\n", ret);
416 goto failed_free_cmap;
417 }
418
419
420
421
422 writel(readl(fbi->regbase) | 1, fbi->regbase);
423
424 return 0;
425
426failed_free_cmap:
427 if (fbi->fb.cmap.len)
428 fb_dealloc_cmap(&fbi->fb.cmap);
429failed_free_irq:
430 free_irq(irq, fbi);
431failed_free_palette:
432 dma_free_coherent(&pdev->dev, fbi->palette_size,
433 fbi->palette_cpu, fbi->palette_phys);
434failed_free_io:
435 iounmap(fbi->regbase);
436failed_free_res:
437 release_mem_region(res->start, resource_size(res));
438 return ret;
439}
440
441static int vt8500lcd_remove(struct platform_device *pdev)
442{
443 struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
444 struct resource *res;
445 int irq;
446
447 unregister_framebuffer(&fbi->fb);
448
449 writel(0, fbi->regbase);
450
451 if (fbi->fb.cmap.len)
452 fb_dealloc_cmap(&fbi->fb.cmap);
453
454 irq = platform_get_irq(pdev, 0);
455 free_irq(irq, fbi);
456
457 dma_free_coherent(&pdev->dev, fbi->palette_size,
458 fbi->palette_cpu, fbi->palette_phys);
459
460 iounmap(fbi->regbase);
461
462 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
463 release_mem_region(res->start, resource_size(res));
464
465 return 0;
466}
467
468static const struct of_device_id via_dt_ids[] = {
469 { .compatible = "via,vt8500-fb", },
470 {}
471};
472
473static struct platform_driver vt8500lcd_driver = {
474 .probe = vt8500lcd_probe,
475 .remove = vt8500lcd_remove,
476 .driver = {
477 .name = "vt8500-lcd",
478 .of_match_table = of_match_ptr(via_dt_ids),
479 },
480};
481
482module_platform_driver(vt8500lcd_driver);
483
484MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
485MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
486MODULE_LICENSE("GPL v2");
487MODULE_DEVICE_TABLE(of, via_dt_ids);
488
