1 /*
2 * WonderMedia WM8505 Frame Buffer device driver
3 *
4 * Copyright (C) 2010 Ed Spiridonov <edo.rus@gmail.com>
5 * Based on vt8500lcdfb.c
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/string.h>
21 #include <linux/mm.h>
22 #include <linux/slab.h>
23 #include <linux/delay.h>
24 #include <linux/fb.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/io.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/platform_device.h>
30 #include <linux/wait.h>
31
32 #include <mach/vt8500fb.h>
33
34 #include "wm8505fb_regs.h"
35 #include "wmt_ge_rops.h"
36
37 #define DRIVER_NAME "wm8505-fb"
38
39 #define to_wm8505fb_info(__info) container_of(__info, \
40 struct wm8505fb_info, fb)
41 struct wm8505fb_info {
42 struct fb_info fb;
43 void __iomem *regbase;
44 unsigned int contrast;
45 };
46
47
wm8505fb_init_hw(struct fb_info * info)48 static int wm8505fb_init_hw(struct fb_info *info)
49 {
50 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
51
52 int i;
53
54 /* I know the purpose only of few registers, so clear unknown */
55 for (i = 0; i < 0x200; i += 4)
56 writel(0, fbi->regbase + i);
57
58 /* Set frame buffer address */
59 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
60 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);
61
62 /* Set in-memory picture format to RGB 32bpp */
63 writel(0x1c, fbi->regbase + WMT_GOVR_COLORSPACE);
64 writel(1, fbi->regbase + WMT_GOVR_COLORSPACE1);
65
66 /* Virtual buffer size */
67 writel(info->var.xres, fbi->regbase + WMT_GOVR_XRES);
68 writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);
69
70 /* black magic ;) */
71 writel(0xf, fbi->regbase + WMT_GOVR_FHI);
72 writel(4, fbi->regbase + WMT_GOVR_DVO_SET);
73 writel(1, fbi->regbase + WMT_GOVR_MIF_ENABLE);
74 writel(1, fbi->regbase + WMT_GOVR_REG_UPDATE);
75
76 return 0;
77 }
78
wm8505fb_set_timing(struct fb_info * info)79 static int wm8505fb_set_timing(struct fb_info *info)
80 {
81 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
82
83 int h_start = info->var.left_margin;
84 int h_end = h_start + info->var.xres;
85 int h_all = h_end + info->var.right_margin;
86 int h_sync = info->var.hsync_len;
87
88 int v_start = info->var.upper_margin;
89 int v_end = v_start + info->var.yres;
90 int v_all = v_end + info->var.lower_margin;
91 int v_sync = info->var.vsync_len;
92
93 writel(0, fbi->regbase + WMT_GOVR_TG);
94
95 writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);
96 writel(h_end, fbi->regbase + WMT_GOVR_TIMING_H_END);
97 writel(h_all, fbi->regbase + WMT_GOVR_TIMING_H_ALL);
98 writel(h_sync, fbi->regbase + WMT_GOVR_TIMING_H_SYNC);
99
100 writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);
101 writel(v_end, fbi->regbase + WMT_GOVR_TIMING_V_END);
102 writel(v_all, fbi->regbase + WMT_GOVR_TIMING_V_ALL);
103 writel(v_sync, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
104
105 writel(1, fbi->regbase + WMT_GOVR_TG);
106
107 return 0;
108 }
109
110
wm8505fb_set_par(struct fb_info * info)111 static int wm8505fb_set_par(struct fb_info *info)
112 {
113 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
114
115 if (!fbi)
116 return -EINVAL;
117
118 if (info->var.bits_per_pixel == 32) {
119 info->var.red.offset = 16;
120 info->var.red.length = 8;
121 info->var.red.msb_right = 0;
122 info->var.green.offset = 8;
123 info->var.green.length = 8;
124 info->var.green.msb_right = 0;
125 info->var.blue.offset = 0;
126 info->var.blue.length = 8;
127 info->var.blue.msb_right = 0;
128 info->fix.visual = FB_VISUAL_TRUECOLOR;
129 info->fix.line_length = info->var.xres_virtual << 2;
130 }
131
132 wm8505fb_set_timing(info);
133
134 writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast,
135 fbi->regbase + WMT_GOVR_CONTRAST);
136
137 return 0;
138 }
139
contrast_show(struct device * dev,struct device_attribute * attr,char * buf)140 static ssize_t contrast_show(struct device *dev,
141 struct device_attribute *attr, char *buf)
142 {
143 struct fb_info *info = dev_get_drvdata(dev);
144 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
145
146 return sprintf(buf, "%d\n", fbi->contrast);
147 }
148
contrast_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)149 static ssize_t contrast_store(struct device *dev,
150 struct device_attribute *attr,
151 const char *buf, size_t count)
152 {
153 struct fb_info *info = dev_get_drvdata(dev);
154 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
155 unsigned long tmp;
156
157 if (strict_strtoul(buf, 10, &tmp) || (tmp > 0xff))
158 return -EINVAL;
159 fbi->contrast = tmp;
160
161 wm8505fb_set_par(info);
162
163 return count;
164 }
165
166 static DEVICE_ATTR(contrast, 0644, contrast_show, contrast_store);
167
chan_to_field(u_int chan,struct fb_bitfield * bf)168 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
169 {
170 chan &= 0xffff;
171 chan >>= 16 - bf->length;
172 return chan << bf->offset;
173 }
174
wm8505fb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)175 static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green,
176 unsigned blue, unsigned transp,
177 struct fb_info *info) {
178 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
179 int ret = 1;
180 unsigned int val;
181 if (regno >= 256)
182 return -EINVAL;
183
184 if (info->var.grayscale)
185 red = green = blue =
186 (19595 * red + 38470 * green + 7471 * blue) >> 16;
187
188 switch (fbi->fb.fix.visual) {
189 case FB_VISUAL_TRUECOLOR:
190 if (regno < 16) {
191 u32 *pal = info->pseudo_palette;
192
193 val = chan_to_field(red, &fbi->fb.var.red);
194 val |= chan_to_field(green, &fbi->fb.var.green);
195 val |= chan_to_field(blue, &fbi->fb.var.blue);
196
197 pal[regno] = val;
198 ret = 0;
199 }
200 break;
201 }
202
203 return ret;
204 }
205
wm8505fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)206 static int wm8505fb_pan_display(struct fb_var_screeninfo *var,
207 struct fb_info *info)
208 {
209 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
210
211 writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN);
212 writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN);
213 return 0;
214 }
215
wm8505fb_blank(int blank,struct fb_info * info)216 static int wm8505fb_blank(int blank, struct fb_info *info)
217 {
218 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
219
220 switch (blank) {
221 case FB_BLANK_UNBLANK:
222 wm8505fb_set_timing(info);
223 break;
224 default:
225 writel(0, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
226 break;
227 }
228
229 return 0;
230 }
231
232 static struct fb_ops wm8505fb_ops = {
233 .owner = THIS_MODULE,
234 .fb_set_par = wm8505fb_set_par,
235 .fb_setcolreg = wm8505fb_setcolreg,
236 .fb_fillrect = wmt_ge_fillrect,
237 .fb_copyarea = wmt_ge_copyarea,
238 .fb_imageblit = sys_imageblit,
239 .fb_sync = wmt_ge_sync,
240 .fb_pan_display = wm8505fb_pan_display,
241 .fb_blank = wm8505fb_blank,
242 };
243
wm8505fb_probe(struct platform_device * pdev)244 static int __devinit wm8505fb_probe(struct platform_device *pdev)
245 {
246 struct wm8505fb_info *fbi;
247 struct resource *res;
248 void *addr;
249 struct vt8500fb_platform_data *pdata;
250 int ret;
251
252 pdata = pdev->dev.platform_data;
253
254 ret = -ENOMEM;
255 fbi = NULL;
256
257 fbi = kzalloc(sizeof(struct wm8505fb_info) + sizeof(u32) * 16,
258 GFP_KERNEL);
259 if (!fbi) {
260 dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
261 ret = -ENOMEM;
262 goto failed;
263 }
264
265 strcpy(fbi->fb.fix.id, DRIVER_NAME);
266
267 fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
268 fbi->fb.fix.xpanstep = 1;
269 fbi->fb.fix.ypanstep = 1;
270 fbi->fb.fix.ywrapstep = 0;
271 fbi->fb.fix.accel = FB_ACCEL_NONE;
272
273 fbi->fb.fbops = &wm8505fb_ops;
274 fbi->fb.flags = FBINFO_DEFAULT
275 | FBINFO_HWACCEL_COPYAREA
276 | FBINFO_HWACCEL_FILLRECT
277 | FBINFO_HWACCEL_XPAN
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 wm8505fb_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), DRIVER_NAME);
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 fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
309
310 fbi->fb.var.nonstd = 0;
311 fbi->fb.var.activate = FB_ACTIVATE_NOW;
312
313 fbi->fb.var.height = -1;
314 fbi->fb.var.width = -1;
315 fbi->fb.var.xres_virtual = pdata->xres_virtual;
316 fbi->fb.var.yres_virtual = pdata->yres_virtual;
317 fbi->fb.var.bits_per_pixel = pdata->bpp;
318
319 fbi->fb.fix.smem_start = pdata->video_mem_phys;
320 fbi->fb.fix.smem_len = pdata->video_mem_len;
321 fbi->fb.screen_base = pdata->video_mem_virt;
322 fbi->fb.screen_size = pdata->video_mem_len;
323
324 if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
325 dev_err(&pdev->dev, "Failed to allocate color map\n");
326 ret = -ENOMEM;
327 goto failed_free_io;
328 }
329
330 wm8505fb_init_hw(&fbi->fb);
331
332 fbi->contrast = 0x80;
333 ret = wm8505fb_set_par(&fbi->fb);
334 if (ret) {
335 dev_err(&pdev->dev, "Failed to set parameters\n");
336 goto failed_free_cmap;
337 }
338
339 platform_set_drvdata(pdev, fbi);
340
341 ret = register_framebuffer(&fbi->fb);
342 if (ret < 0) {
343 dev_err(&pdev->dev,
344 "Failed to register framebuffer device: %d\n", ret);
345 goto failed_free_cmap;
346 }
347
348 ret = device_create_file(&pdev->dev, &dev_attr_contrast);
349 if (ret < 0) {
350 printk(KERN_WARNING "fb%d: failed to register attributes (%d)\n",
351 fbi->fb.node, ret);
352 }
353
354 printk(KERN_INFO "fb%d: %s frame buffer at 0x%lx-0x%lx\n",
355 fbi->fb.node, fbi->fb.fix.id, fbi->fb.fix.smem_start,
356 fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);
357
358 return 0;
359
360 failed_free_cmap:
361 if (fbi->fb.cmap.len)
362 fb_dealloc_cmap(&fbi->fb.cmap);
363 failed_free_io:
364 iounmap(fbi->regbase);
365 failed_free_res:
366 release_mem_region(res->start, resource_size(res));
367 failed_fbi:
368 platform_set_drvdata(pdev, NULL);
369 kfree(fbi);
370 failed:
371 return ret;
372 }
373
wm8505fb_remove(struct platform_device * pdev)374 static int __devexit wm8505fb_remove(struct platform_device *pdev)
375 {
376 struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
377 struct resource *res;
378
379 device_remove_file(&pdev->dev, &dev_attr_contrast);
380
381 unregister_framebuffer(&fbi->fb);
382
383 writel(0, fbi->regbase);
384
385 if (fbi->fb.cmap.len)
386 fb_dealloc_cmap(&fbi->fb.cmap);
387
388 iounmap(fbi->regbase);
389
390 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
391 release_mem_region(res->start, resource_size(res));
392
393 kfree(fbi);
394
395 return 0;
396 }
397
398 static struct platform_driver wm8505fb_driver = {
399 .probe = wm8505fb_probe,
400 .remove = __devexit_p(wm8505fb_remove),
401 .driver = {
402 .owner = THIS_MODULE,
403 .name = DRIVER_NAME,
404 },
405 };
406
407 module_platform_driver(wm8505fb_driver);
408
409 MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
410 MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
411 MODULE_LICENSE("GPL");
412