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/delay.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/fb.h>
20 #include <linux/errno.h>
21 #include <linux/err.h>
22 #include <linux/init.h>
23 #include <linux/interrupt.h>
24 #include <linux/io.h>
25 #include <linux/kernel.h>
26 #include <linux/memblock.h>
27 #include <linux/mm.h>
28 #include <linux/module.h>
29 #include <linux/of.h>
30 #include <linux/of_fdt.h>
31 #include <linux/platform_device.h>
32 #include <linux/slab.h>
33 #include <linux/string.h>
34 #include <linux/wait.h>
35 #include <video/of_display_timing.h>
36
37 #include "wm8505fb_regs.h"
38 #include "wmt_ge_rops.h"
39
40 #define DRIVER_NAME "wm8505-fb"
41
42 #define to_wm8505fb_info(__info) container_of(__info, \
43 struct wm8505fb_info, fb)
44 struct wm8505fb_info {
45 struct fb_info fb;
46 void __iomem *regbase;
47 unsigned int contrast;
48 };
49
50
wm8505fb_init_hw(struct fb_info * info)51 static int wm8505fb_init_hw(struct fb_info *info)
52 {
53 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
54
55 int i;
56
57 /* I know the purpose only of few registers, so clear unknown */
58 for (i = 0; i < 0x200; i += 4)
59 writel(0, fbi->regbase + i);
60
61 /* Set frame buffer address */
62 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
63 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);
64
65 /*
66 * Set in-memory picture format to RGB
67 * 0x31C sets the correct color mode (RGB565) for WM8650
68 * Bit 8+9 (0x300) are ignored on WM8505 as reserved
69 */
70 writel(0x31c, fbi->regbase + WMT_GOVR_COLORSPACE);
71 writel(1, fbi->regbase + WMT_GOVR_COLORSPACE1);
72
73 /* Virtual buffer size */
74 writel(info->var.xres, fbi->regbase + WMT_GOVR_XRES);
75 writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);
76
77 /* black magic ;) */
78 writel(0xf, fbi->regbase + WMT_GOVR_FHI);
79 writel(4, fbi->regbase + WMT_GOVR_DVO_SET);
80 writel(1, fbi->regbase + WMT_GOVR_MIF_ENABLE);
81 writel(1, fbi->regbase + WMT_GOVR_REG_UPDATE);
82
83 return 0;
84 }
85
wm8505fb_set_timing(struct fb_info * info)86 static int wm8505fb_set_timing(struct fb_info *info)
87 {
88 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
89
90 int h_start = info->var.left_margin;
91 int h_end = h_start + info->var.xres;
92 int h_all = h_end + info->var.right_margin;
93 int h_sync = info->var.hsync_len;
94
95 int v_start = info->var.upper_margin;
96 int v_end = v_start + info->var.yres;
97 int v_all = v_end + info->var.lower_margin;
98 int v_sync = info->var.vsync_len;
99
100 writel(0, fbi->regbase + WMT_GOVR_TG);
101
102 writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);
103 writel(h_end, fbi->regbase + WMT_GOVR_TIMING_H_END);
104 writel(h_all, fbi->regbase + WMT_GOVR_TIMING_H_ALL);
105 writel(h_sync, fbi->regbase + WMT_GOVR_TIMING_H_SYNC);
106
107 writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);
108 writel(v_end, fbi->regbase + WMT_GOVR_TIMING_V_END);
109 writel(v_all, fbi->regbase + WMT_GOVR_TIMING_V_ALL);
110 writel(v_sync, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
111
112 writel(1, fbi->regbase + WMT_GOVR_TG);
113
114 return 0;
115 }
116
117
wm8505fb_set_par(struct fb_info * info)118 static int wm8505fb_set_par(struct fb_info *info)
119 {
120 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
121
122 if (!fbi)
123 return -EINVAL;
124
125 if (info->var.bits_per_pixel == 32) {
126 info->var.red.offset = 16;
127 info->var.red.length = 8;
128 info->var.red.msb_right = 0;
129 info->var.green.offset = 8;
130 info->var.green.length = 8;
131 info->var.green.msb_right = 0;
132 info->var.blue.offset = 0;
133 info->var.blue.length = 8;
134 info->var.blue.msb_right = 0;
135 info->fix.visual = FB_VISUAL_TRUECOLOR;
136 info->fix.line_length = info->var.xres_virtual << 2;
137 } else if (info->var.bits_per_pixel == 16) {
138 info->var.red.offset = 11;
139 info->var.red.length = 5;
140 info->var.red.msb_right = 0;
141 info->var.green.offset = 5;
142 info->var.green.length = 6;
143 info->var.green.msb_right = 0;
144 info->var.blue.offset = 0;
145 info->var.blue.length = 5;
146 info->var.blue.msb_right = 0;
147 info->fix.visual = FB_VISUAL_TRUECOLOR;
148 info->fix.line_length = info->var.xres_virtual << 1;
149 }
150
151 wm8505fb_set_timing(info);
152
153 writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast,
154 fbi->regbase + WMT_GOVR_CONTRAST);
155
156 return 0;
157 }
158
contrast_show(struct device * dev,struct device_attribute * attr,char * buf)159 static ssize_t contrast_show(struct device *dev,
160 struct device_attribute *attr, char *buf)
161 {
162 struct fb_info *info = dev_get_drvdata(dev);
163 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
164
165 return sprintf(buf, "%u\n", fbi->contrast);
166 }
167
contrast_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)168 static ssize_t contrast_store(struct device *dev,
169 struct device_attribute *attr,
170 const char *buf, size_t count)
171 {
172 struct fb_info *info = dev_get_drvdata(dev);
173 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
174 unsigned long tmp;
175
176 if (kstrtoul(buf, 10, &tmp) || (tmp > 0xff))
177 return -EINVAL;
178 fbi->contrast = tmp;
179
180 wm8505fb_set_par(info);
181
182 return count;
183 }
184
185 static DEVICE_ATTR_RW(contrast);
186
chan_to_field(u_int chan,struct fb_bitfield * bf)187 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
188 {
189 chan &= 0xffff;
190 chan >>= 16 - bf->length;
191 return chan << bf->offset;
192 }
193
wm8505fb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)194 static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green,
195 unsigned blue, unsigned transp,
196 struct fb_info *info) {
197 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
198 int ret = 1;
199 unsigned int val;
200 if (regno >= 256)
201 return -EINVAL;
202
203 if (info->var.grayscale)
204 red = green = blue =
205 (19595 * red + 38470 * green + 7471 * blue) >> 16;
206
207 switch (fbi->fb.fix.visual) {
208 case FB_VISUAL_TRUECOLOR:
209 if (regno < 16) {
210 u32 *pal = info->pseudo_palette;
211
212 val = chan_to_field(red, &fbi->fb.var.red);
213 val |= chan_to_field(green, &fbi->fb.var.green);
214 val |= chan_to_field(blue, &fbi->fb.var.blue);
215
216 pal[regno] = val;
217 ret = 0;
218 }
219 break;
220 }
221
222 return ret;
223 }
224
wm8505fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)225 static int wm8505fb_pan_display(struct fb_var_screeninfo *var,
226 struct fb_info *info)
227 {
228 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
229
230 writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN);
231 writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN);
232 return 0;
233 }
234
wm8505fb_blank(int blank,struct fb_info * info)235 static int wm8505fb_blank(int blank, struct fb_info *info)
236 {
237 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
238
239 switch (blank) {
240 case FB_BLANK_UNBLANK:
241 wm8505fb_set_timing(info);
242 break;
243 default:
244 writel(0, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
245 break;
246 }
247
248 return 0;
249 }
250
251 static struct fb_ops wm8505fb_ops = {
252 .owner = THIS_MODULE,
253 .fb_set_par = wm8505fb_set_par,
254 .fb_setcolreg = wm8505fb_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_pan_display = wm8505fb_pan_display,
260 .fb_blank = wm8505fb_blank,
261 };
262
wm8505fb_probe(struct platform_device * pdev)263 static int wm8505fb_probe(struct platform_device *pdev)
264 {
265 struct wm8505fb_info *fbi;
266 struct resource *res;
267 struct display_timings *disp_timing;
268 void *addr;
269 int ret;
270
271 struct fb_videomode mode;
272 u32 bpp;
273 dma_addr_t fb_mem_phys;
274 unsigned long fb_mem_len;
275 void *fb_mem_virt;
276
277 fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) +
278 sizeof(u32) * 16, GFP_KERNEL);
279 if (!fbi)
280 return -ENOMEM;
281
282 strcpy(fbi->fb.fix.id, DRIVER_NAME);
283
284 fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
285 fbi->fb.fix.xpanstep = 1;
286 fbi->fb.fix.ypanstep = 1;
287 fbi->fb.fix.ywrapstep = 0;
288 fbi->fb.fix.accel = FB_ACCEL_NONE;
289
290 fbi->fb.fbops = &wm8505fb_ops;
291 fbi->fb.flags = FBINFO_DEFAULT
292 | FBINFO_HWACCEL_COPYAREA
293 | FBINFO_HWACCEL_FILLRECT
294 | FBINFO_HWACCEL_XPAN
295 | FBINFO_HWACCEL_YPAN
296 | FBINFO_VIRTFB
297 | FBINFO_PARTIAL_PAN_OK;
298 fbi->fb.node = -1;
299
300 addr = fbi;
301 addr = addr + sizeof(struct wm8505fb_info);
302 fbi->fb.pseudo_palette = addr;
303
304 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
305 fbi->regbase = devm_ioremap_resource(&pdev->dev, res);
306 if (IS_ERR(fbi->regbase))
307 return PTR_ERR(fbi->regbase);
308
309 disp_timing = of_get_display_timings(pdev->dev.of_node);
310 if (!disp_timing)
311 return -EINVAL;
312
313 ret = of_get_fb_videomode(pdev->dev.of_node, &mode, OF_USE_NATIVE_MODE);
314 if (ret)
315 return ret;
316
317 ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
318 if (ret)
319 return ret;
320
321 fb_videomode_to_var(&fbi->fb.var, &mode);
322
323 fbi->fb.var.nonstd = 0;
324 fbi->fb.var.activate = FB_ACTIVATE_NOW;
325
326 fbi->fb.var.height = -1;
327 fbi->fb.var.width = -1;
328
329 /* try allocating the framebuffer */
330 fb_mem_len = mode.xres * mode.yres * 2 * (bpp / 8);
331 fb_mem_virt = dmam_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
332 GFP_KERNEL);
333 if (!fb_mem_virt) {
334 pr_err("%s: Failed to allocate framebuffer\n", __func__);
335 return -ENOMEM;
336 }
337
338 fbi->fb.var.xres_virtual = mode.xres;
339 fbi->fb.var.yres_virtual = mode.yres * 2;
340 fbi->fb.var.bits_per_pixel = bpp;
341
342 fbi->fb.fix.smem_start = fb_mem_phys;
343 fbi->fb.fix.smem_len = fb_mem_len;
344 fbi->fb.screen_base = fb_mem_virt;
345 fbi->fb.screen_size = fb_mem_len;
346
347 fbi->contrast = 0x10;
348 ret = wm8505fb_set_par(&fbi->fb);
349 if (ret) {
350 dev_err(&pdev->dev, "Failed to set parameters\n");
351 return ret;
352 }
353
354 if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
355 dev_err(&pdev->dev, "Failed to allocate color map\n");
356 return -ENOMEM;
357 }
358
359 wm8505fb_init_hw(&fbi->fb);
360
361 platform_set_drvdata(pdev, fbi);
362
363 ret = register_framebuffer(&fbi->fb);
364 if (ret < 0) {
365 dev_err(&pdev->dev,
366 "Failed to register framebuffer device: %d\n", ret);
367 if (fbi->fb.cmap.len)
368 fb_dealloc_cmap(&fbi->fb.cmap);
369 return ret;
370 }
371
372 ret = device_create_file(&pdev->dev, &dev_attr_contrast);
373 if (ret < 0)
374 fb_warn(&fbi->fb, "failed to register attributes (%d)\n", ret);
375
376 fb_info(&fbi->fb, "%s frame buffer at 0x%lx-0x%lx\n",
377 fbi->fb.fix.id, fbi->fb.fix.smem_start,
378 fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);
379
380 return 0;
381 }
382
wm8505fb_remove(struct platform_device * pdev)383 static int wm8505fb_remove(struct platform_device *pdev)
384 {
385 struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
386
387 device_remove_file(&pdev->dev, &dev_attr_contrast);
388
389 unregister_framebuffer(&fbi->fb);
390
391 writel(0, fbi->regbase);
392
393 if (fbi->fb.cmap.len)
394 fb_dealloc_cmap(&fbi->fb.cmap);
395
396 return 0;
397 }
398
399 static const struct of_device_id wmt_dt_ids[] = {
400 { .compatible = "wm,wm8505-fb", },
401 {}
402 };
403
404 static struct platform_driver wm8505fb_driver = {
405 .probe = wm8505fb_probe,
406 .remove = wm8505fb_remove,
407 .driver = {
408 .name = DRIVER_NAME,
409 .of_match_table = wmt_dt_ids,
410 },
411 };
412
413 module_platform_driver(wm8505fb_driver);
414
415 MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
416 MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
417 MODULE_LICENSE("GPL v2");
418 MODULE_DEVICE_TABLE(of, wmt_dt_ids);
419
