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Linux/drivers/video/vt8500lcdfb.c

  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/delay.h>
 19 #include <linux/dma-mapping.h>
 20 #include <linux/errno.h>
 21 #include <linux/fb.h>
 22 #include <linux/init.h>
 23 #include <linux/interrupt.h>
 24 #include <linux/io.h>
 25 #include <linux/kernel.h>
 26 #include <linux/mm.h>
 27 #include <linux/module.h>
 28 #include <linux/platform_device.h>
 29 #include <linux/slab.h>
 30 #include <linux/string.h>
 31 #include <linux/wait.h>
 32 #include <video/of_display_timing.h>
 33 
 34 #include "vt8500lcdfb.h"
 35 #include "wmt_ge_rops.h"
 36 
 37 #ifdef CONFIG_OF
 38 #include <linux/of.h>
 39 #include <linux/of_fdt.h>
 40 #include <linux/memblock.h>
 41 #endif
 42 
 43 
 44 #define to_vt8500lcd_info(__info) container_of(__info, \
 45                                                 struct vt8500lcd_info, fb)
 46 
 47 static int vt8500lcd_set_par(struct fb_info *info)
 48 {
 49         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
 50         int reg_bpp = 5; /* 16bpp */
 51         int i;
 52         unsigned long control0;
 53 
 54         if (!fbi)
 55                 return -EINVAL;
 56 
 57         if (info->var.bits_per_pixel <= 8) {
 58                 /* palettized */
 59                 info->var.red.offset    = 0;
 60                 info->var.red.length    = info->var.bits_per_pixel;
 61                 info->var.red.msb_right = 0;
 62 
 63                 info->var.green.offset  = 0;
 64                 info->var.green.length  = info->var.bits_per_pixel;
 65                 info->var.green.msb_right = 0;
 66 
 67                 info->var.blue.offset   = 0;
 68                 info->var.blue.length   = info->var.bits_per_pixel;
 69                 info->var.blue.msb_right = 0;
 70 
 71                 info->var.transp.offset = 0;
 72                 info->var.transp.length = 0;
 73                 info->var.transp.msb_right = 0;
 74 
 75                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 76                 info->fix.line_length = info->var.xres_virtual /
 77                                                 (8/info->var.bits_per_pixel);
 78         } else {
 79                 /* non-palettized */
 80                 info->var.transp.offset = 0;
 81                 info->var.transp.length = 0;
 82                 info->var.transp.msb_right = 0;
 83 
 84                 if (info->var.bits_per_pixel == 16) {
 85                         /* RGB565 */
 86                         info->var.red.offset = 11;
 87                         info->var.red.length = 5;
 88                         info->var.red.msb_right = 0;
 89                         info->var.green.offset = 5;
 90                         info->var.green.length = 6;
 91                         info->var.green.msb_right = 0;
 92                         info->var.blue.offset = 0;
 93                         info->var.blue.length = 5;
 94                         info->var.blue.msb_right = 0;
 95                 } else {
 96                         /* Equal depths per channel */
 97                         info->var.red.offset = info->var.bits_per_pixel
 98                                                         * 2 / 3;
 99                         info->var.red.length = info->var.bits_per_pixel / 3;
100                         info->var.red.msb_right = 0;
101                         info->var.green.offset = info->var.bits_per_pixel / 3;
102                         info->var.green.length = info->var.bits_per_pixel / 3;
103                         info->var.green.msb_right = 0;
104                         info->var.blue.offset = 0;
105                         info->var.blue.length = info->var.bits_per_pixel / 3;
106                         info->var.blue.msb_right = 0;
107                 }
108 
109                 info->fix.visual = FB_VISUAL_TRUECOLOR;
110                 info->fix.line_length = info->var.bits_per_pixel > 16 ?
111                                         info->var.xres_virtual << 2 :
112                                         info->var.xres_virtual << 1;
113         }
114 
115         for (i = 0; i < 8; i++) {
116                 if (bpp_values[i] == info->var.bits_per_pixel) {
117                         reg_bpp = i;
118                         continue;
119                 }
120         }
121 
122         control0 = readl(fbi->regbase) & ~0xf;
123         writel(0, fbi->regbase);
124         while (readl(fbi->regbase + 0x38) & 0x10)
125                 /* wait */;
126         writel((((info->var.hsync_len - 1) & 0x3f) << 26)
127                 | ((info->var.left_margin & 0xff) << 18)
128                 | (((info->var.xres - 1) & 0x3ff) << 8)
129                 | (info->var.right_margin & 0xff), fbi->regbase + 0x4);
130         writel((((info->var.vsync_len - 1) & 0x3f) << 26)
131                 | ((info->var.upper_margin & 0xff) << 18)
132                 | (((info->var.yres - 1) & 0x3ff) << 8)
133                 | (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
134         writel((((info->var.yres - 1) & 0x400) << 2)
135                 | ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
136         writel(0x80000000, fbi->regbase + 0x20);
137         writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);
138 
139         return 0;
140 }
141 
142 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
143 {
144         chan &= 0xffff;
145         chan >>= 16 - bf->length;
146         return chan << bf->offset;
147 }
148 
149 static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
150                            unsigned blue, unsigned transp,
151                            struct fb_info *info) {
152         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
153         int ret = 1;
154         unsigned int val;
155         if (regno >= 256)
156                 return -EINVAL;
157 
158         if (info->var.grayscale)
159                 red = green = blue =
160                         (19595 * red + 38470 * green + 7471 * blue) >> 16;
161 
162         switch (fbi->fb.fix.visual) {
163         case FB_VISUAL_TRUECOLOR:
164                 if (regno < 16) {
165                         u32 *pal = fbi->fb.pseudo_palette;
166 
167                         val  = chan_to_field(red, &fbi->fb.var.red);
168                         val |= chan_to_field(green, &fbi->fb.var.green);
169                         val |= chan_to_field(blue, &fbi->fb.var.blue);
170 
171                         pal[regno] = val;
172                         ret = 0;
173                 }
174                 break;
175 
176         case FB_VISUAL_STATIC_PSEUDOCOLOR:
177         case FB_VISUAL_PSEUDOCOLOR:
178                 writew((red & 0xf800)
179                       | ((green >> 5) & 0x7e0)
180                       | ((blue >> 11) & 0x1f),
181                        fbi->palette_cpu + sizeof(u16) * regno);
182                 break;
183         }
184 
185         return ret;
186 }
187 
188 static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
189                          unsigned long arg)
190 {
191         int ret = 0;
192         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
193 
194         if (cmd == FBIO_WAITFORVSYNC) {
195                 /* Unmask End of Frame interrupt */
196                 writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
197                 ret = wait_event_interruptible_timeout(fbi->wait,
198                         readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
199                 /* Mask back to reduce unwanted interrupt traffic */
200                 writel(0xffffffff, fbi->regbase + 0x3c);
201                 if (ret < 0)
202                         return ret;
203                 if (ret == 0)
204                         return -ETIMEDOUT;
205         }
206 
207         return ret;
208 }
209 
210 static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
211                                 struct fb_info *info)
212 {
213         unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
214         unsigned off = pixlen * var->xoffset
215                       + info->fix.line_length * var->yoffset;
216         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
217 
218         writel((1 << 31)
219              | (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
220              | (off >> 2), fbi->regbase + 0x20);
221         return 0;
222 }
223 
224 /*
225  * vt8500lcd_blank():
226  *      Blank the display by setting all palette values to zero.  Note,
227  *      True Color modes do not really use the palette, so this will not
228  *      blank the display in all modes.
229  */
230 static int vt8500lcd_blank(int blank, struct fb_info *info)
231 {
232         int i;
233 
234         switch (blank) {
235         case FB_BLANK_POWERDOWN:
236         case FB_BLANK_VSYNC_SUSPEND:
237         case FB_BLANK_HSYNC_SUSPEND:
238         case FB_BLANK_NORMAL:
239                 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
240                     info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
241                         for (i = 0; i < 256; i++)
242                                 vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
243         case FB_BLANK_UNBLANK:
244                 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
245                     info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
246                         fb_set_cmap(&info->cmap, info);
247         }
248         return 0;
249 }
250 
251 static struct fb_ops vt8500lcd_ops = {
252         .owner          = THIS_MODULE,
253         .fb_set_par     = vt8500lcd_set_par,
254         .fb_setcolreg   = vt8500lcd_setcolreg,
255         .fb_fillrect    = wmt_ge_fillrect,
256         .fb_copyarea    = wmt_ge_copyarea,
257         .fb_imageblit   = sys_imageblit,
258         .fb_sync        = wmt_ge_sync,
259         .fb_ioctl       = vt8500lcd_ioctl,
260         .fb_pan_display = vt8500lcd_pan_display,
261         .fb_blank       = vt8500lcd_blank,
262 };
263 
264 static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
265 {
266         struct vt8500lcd_info *fbi = dev_id;
267 
268         if (readl(fbi->regbase + 0x38) & (1 << 3))
269                 wake_up_interruptible(&fbi->wait);
270 
271         writel(0xffffffff, fbi->regbase + 0x38);
272         return IRQ_HANDLED;
273 }
274 
275 static int vt8500lcd_probe(struct platform_device *pdev)
276 {
277         struct vt8500lcd_info *fbi;
278         struct resource *res;
279         struct display_timings *disp_timing;
280         void *addr;
281         int irq, ret;
282 
283         struct fb_videomode     of_mode;
284         u32                     bpp;
285         dma_addr_t fb_mem_phys;
286         unsigned long fb_mem_len;
287         void *fb_mem_virt;
288 
289         ret = -ENOMEM;
290         fbi = NULL;
291 
292         fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
293                         + sizeof(u32) * 16, GFP_KERNEL);
294         if (!fbi) {
295                 dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
296                 return -ENOMEM;
297         }
298 
299         strcpy(fbi->fb.fix.id, "VT8500 LCD");
300 
301         fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
302         fbi->fb.fix.xpanstep    = 0;
303         fbi->fb.fix.ypanstep    = 1;
304         fbi->fb.fix.ywrapstep   = 0;
305         fbi->fb.fix.accel       = FB_ACCEL_NONE;
306 
307         fbi->fb.var.nonstd      = 0;
308         fbi->fb.var.activate    = FB_ACTIVATE_NOW;
309         fbi->fb.var.height      = -1;
310         fbi->fb.var.width       = -1;
311         fbi->fb.var.vmode       = FB_VMODE_NONINTERLACED;
312 
313         fbi->fb.fbops           = &vt8500lcd_ops;
314         fbi->fb.flags           = FBINFO_DEFAULT
315                                 | FBINFO_HWACCEL_COPYAREA
316                                 | FBINFO_HWACCEL_FILLRECT
317                                 | FBINFO_HWACCEL_YPAN
318                                 | FBINFO_VIRTFB
319                                 | FBINFO_PARTIAL_PAN_OK;
320         fbi->fb.node            = -1;
321 
322         addr = fbi;
323         addr = addr + sizeof(struct vt8500lcd_info);
324         fbi->fb.pseudo_palette  = addr;
325 
326         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
327         if (res == NULL) {
328                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
329                 return -ENODEV;
330         }
331 
332         res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
333         if (res == NULL) {
334                 dev_err(&pdev->dev, "failed to request I/O memory\n");
335                 return -EBUSY;
336         }
337 
338         fbi->regbase = ioremap(res->start, resource_size(res));
339         if (fbi->regbase == NULL) {
340                 dev_err(&pdev->dev, "failed to map I/O memory\n");
341                 ret = -EBUSY;
342                 goto failed_free_res;
343         }
344 
345         disp_timing = of_get_display_timings(pdev->dev.of_node);
346         if (!disp_timing) {
347                 ret = -EINVAL;
348                 goto failed_free_io;
349         }
350 
351         ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode,
352                                                         OF_USE_NATIVE_MODE);
353         if (ret)
354                 goto failed_free_io;
355 
356         ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
357         if (ret)
358                 goto failed_free_io;
359 
360         /* try allocating the framebuffer */
361         fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
362         fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
363                                 GFP_KERNEL);
364         if (!fb_mem_virt) {
365                 pr_err("%s: Failed to allocate framebuffer\n", __func__);
366                 ret = -ENOMEM;
367                 goto failed_free_io;
368         }
369 
370         fbi->fb.fix.smem_start  = fb_mem_phys;
371         fbi->fb.fix.smem_len    = fb_mem_len;
372         fbi->fb.screen_base     = fb_mem_virt;
373 
374         fbi->palette_size       = PAGE_ALIGN(512);
375         fbi->palette_cpu        = dma_alloc_coherent(&pdev->dev,
376                                                      fbi->palette_size,
377                                                      &fbi->palette_phys,
378                                                      GFP_KERNEL);
379         if (fbi->palette_cpu == NULL) {
380                 dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
381                 ret = -ENOMEM;
382                 goto failed_free_io;
383         }
384 
385         irq = platform_get_irq(pdev, 0);
386         if (irq < 0) {
387                 dev_err(&pdev->dev, "no IRQ defined\n");
388                 ret = -ENODEV;
389                 goto failed_free_palette;
390         }
391 
392         ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
393         if (ret) {
394                 dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
395                 ret = -EBUSY;
396                 goto failed_free_palette;
397         }
398 
399         init_waitqueue_head(&fbi->wait);
400 
401         if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
402                 dev_err(&pdev->dev, "Failed to allocate color map\n");
403                 ret = -ENOMEM;
404                 goto failed_free_irq;
405         }
406 
407         fb_videomode_to_var(&fbi->fb.var, &of_mode);
408 
409         fbi->fb.var.xres_virtual        = of_mode.xres;
410         fbi->fb.var.yres_virtual        = of_mode.yres * 2;
411         fbi->fb.var.bits_per_pixel      = bpp;
412 
413         ret = vt8500lcd_set_par(&fbi->fb);
414         if (ret) {
415                 dev_err(&pdev->dev, "Failed to set parameters\n");
416                 goto failed_free_cmap;
417         }
418 
419         writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
420         writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);
421 
422         platform_set_drvdata(pdev, fbi);
423 
424         ret = register_framebuffer(&fbi->fb);
425         if (ret < 0) {
426                 dev_err(&pdev->dev,
427                         "Failed to register framebuffer device: %d\n", ret);
428                 goto failed_free_cmap;
429         }
430 
431         /*
432          * Ok, now enable the LCD controller
433          */
434         writel(readl(fbi->regbase) | 1, fbi->regbase);
435 
436         return 0;
437 
438 failed_free_cmap:
439         if (fbi->fb.cmap.len)
440                 fb_dealloc_cmap(&fbi->fb.cmap);
441 failed_free_irq:
442         free_irq(irq, fbi);
443 failed_free_palette:
444         dma_free_coherent(&pdev->dev, fbi->palette_size,
445                           fbi->palette_cpu, fbi->palette_phys);
446 failed_free_io:
447         iounmap(fbi->regbase);
448 failed_free_res:
449         release_mem_region(res->start, resource_size(res));
450         return ret;
451 }
452 
453 static int vt8500lcd_remove(struct platform_device *pdev)
454 {
455         struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
456         struct resource *res;
457         int irq;
458 
459         unregister_framebuffer(&fbi->fb);
460 
461         writel(0, fbi->regbase);
462 
463         if (fbi->fb.cmap.len)
464                 fb_dealloc_cmap(&fbi->fb.cmap);
465 
466         irq = platform_get_irq(pdev, 0);
467         free_irq(irq, fbi);
468 
469         dma_free_coherent(&pdev->dev, fbi->palette_size,
470                           fbi->palette_cpu, fbi->palette_phys);
471 
472         iounmap(fbi->regbase);
473 
474         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
475         release_mem_region(res->start, resource_size(res));
476 
477         kfree(fbi);
478 
479         return 0;
480 }
481 
482 static const struct of_device_id via_dt_ids[] = {
483         { .compatible = "via,vt8500-fb", },
484         {}
485 };
486 
487 static struct platform_driver vt8500lcd_driver = {
488         .probe          = vt8500lcd_probe,
489         .remove         = vt8500lcd_remove,
490         .driver         = {
491                 .owner  = THIS_MODULE,
492                 .name   = "vt8500-lcd",
493                 .of_match_table = of_match_ptr(via_dt_ids),
494         },
495 };
496 
497 module_platform_driver(vt8500lcd_driver);
498 
499 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
500 MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
501 MODULE_LICENSE("GPL v2");
502 MODULE_DEVICE_TABLE(of, via_dt_ids);
503 

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