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d6ff7d0f AC |
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> | |
e7b99537 TP |
31 | #include <linux/of.h> |
32 | #include <linux/of_fdt.h> | |
33 | #include <linux/memblock.h> | |
d6ff7d0f | 34 | |
19d33101 | 35 | #include <linux/platform_data/video-vt8500lcdfb.h> |
d6ff7d0f AC |
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 | ||
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 | ||
e7b99537 TP |
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); | |
d6ff7d0f AC |
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 | ||
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; | |
623eb156 | 98 | int v_sync = info->var.vsync_len; |
d6ff7d0f AC |
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 | ||
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; | |
e7b99537 TP |
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; | |
d6ff7d0f AC |
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 | ||
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, "%d\n", fbi->contrast); | |
166 | } | |
167 | ||
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 (strict_strtoul(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(contrast, 0644, contrast_show, contrast_store); | |
186 | ||
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 | ||
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 | ||
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 | ||
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 | ||
263 | static int __devinit wm8505fb_probe(struct platform_device *pdev) | |
264 | { | |
265 | struct wm8505fb_info *fbi; | |
266 | struct resource *res; | |
267 | void *addr; | |
d6ff7d0f AC |
268 | int ret; |
269 | ||
e7b99537 TP |
270 | struct fb_videomode of_mode; |
271 | struct device_node *np; | |
272 | u32 bpp; | |
273 | dma_addr_t fb_mem_phys; | |
274 | unsigned long fb_mem_len; | |
275 | void *fb_mem_virt; | |
d6ff7d0f AC |
276 | |
277 | ret = -ENOMEM; | |
278 | fbi = NULL; | |
279 | ||
e7b99537 TP |
280 | fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) + |
281 | sizeof(u32) * 16, GFP_KERNEL); | |
d6ff7d0f AC |
282 | if (!fbi) { |
283 | dev_err(&pdev->dev, "Failed to initialize framebuffer device\n"); | |
284 | ret = -ENOMEM; | |
285 | goto failed; | |
286 | } | |
287 | ||
288 | strcpy(fbi->fb.fix.id, DRIVER_NAME); | |
289 | ||
290 | fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS; | |
291 | fbi->fb.fix.xpanstep = 1; | |
292 | fbi->fb.fix.ypanstep = 1; | |
293 | fbi->fb.fix.ywrapstep = 0; | |
294 | fbi->fb.fix.accel = FB_ACCEL_NONE; | |
295 | ||
296 | fbi->fb.fbops = &wm8505fb_ops; | |
297 | fbi->fb.flags = FBINFO_DEFAULT | |
298 | | FBINFO_HWACCEL_COPYAREA | |
299 | | FBINFO_HWACCEL_FILLRECT | |
300 | | FBINFO_HWACCEL_XPAN | |
301 | | FBINFO_HWACCEL_YPAN | |
302 | | FBINFO_VIRTFB | |
303 | | FBINFO_PARTIAL_PAN_OK; | |
304 | fbi->fb.node = -1; | |
305 | ||
306 | addr = fbi; | |
307 | addr = addr + sizeof(struct wm8505fb_info); | |
308 | fbi->fb.pseudo_palette = addr; | |
309 | ||
310 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
311 | if (res == NULL) { | |
312 | dev_err(&pdev->dev, "no I/O memory resource defined\n"); | |
313 | ret = -ENODEV; | |
314 | goto failed_fbi; | |
315 | } | |
316 | ||
a7f53284 | 317 | res = request_mem_region(res->start, resource_size(res), DRIVER_NAME); |
d6ff7d0f AC |
318 | if (res == NULL) { |
319 | dev_err(&pdev->dev, "failed to request I/O memory\n"); | |
320 | ret = -EBUSY; | |
321 | goto failed_fbi; | |
322 | } | |
323 | ||
324 | fbi->regbase = ioremap(res->start, resource_size(res)); | |
325 | if (fbi->regbase == NULL) { | |
326 | dev_err(&pdev->dev, "failed to map I/O memory\n"); | |
327 | ret = -EBUSY; | |
328 | goto failed_free_res; | |
329 | } | |
330 | ||
e7b99537 TP |
331 | np = of_parse_phandle(pdev->dev.of_node, "default-mode", 0); |
332 | if (!np) { | |
333 | pr_err("%s: No display description in Device Tree\n", __func__); | |
334 | ret = -EINVAL; | |
335 | goto failed_free_res; | |
336 | } | |
337 | ||
338 | /* | |
339 | * This code is copied from Sascha Hauer's of_videomode helper | |
340 | * and can be replaced with a call to the helper once mainlined | |
341 | */ | |
342 | ret = 0; | |
343 | ret |= of_property_read_u32(np, "hactive", &of_mode.xres); | |
344 | ret |= of_property_read_u32(np, "vactive", &of_mode.yres); | |
345 | ret |= of_property_read_u32(np, "hback-porch", &of_mode.left_margin); | |
346 | ret |= of_property_read_u32(np, "hfront-porch", &of_mode.right_margin); | |
347 | ret |= of_property_read_u32(np, "hsync-len", &of_mode.hsync_len); | |
348 | ret |= of_property_read_u32(np, "vback-porch", &of_mode.upper_margin); | |
349 | ret |= of_property_read_u32(np, "vfront-porch", &of_mode.lower_margin); | |
350 | ret |= of_property_read_u32(np, "vsync-len", &of_mode.vsync_len); | |
351 | ret |= of_property_read_u32(np, "bpp", &bpp); | |
352 | if (ret) { | |
353 | pr_err("%s: Unable to read display properties\n", __func__); | |
354 | goto failed_free_res; | |
355 | } | |
356 | ||
357 | of_mode.vmode = FB_VMODE_NONINTERLACED; | |
358 | fb_videomode_to_var(&fbi->fb.var, &of_mode); | |
d6ff7d0f AC |
359 | |
360 | fbi->fb.var.nonstd = 0; | |
361 | fbi->fb.var.activate = FB_ACTIVATE_NOW; | |
362 | ||
363 | fbi->fb.var.height = -1; | |
364 | fbi->fb.var.width = -1; | |
d6ff7d0f | 365 | |
e7b99537 TP |
366 | /* try allocating the framebuffer */ |
367 | fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8); | |
368 | fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys, | |
369 | GFP_KERNEL); | |
370 | if (!fb_mem_virt) { | |
371 | pr_err("%s: Failed to allocate framebuffer\n", __func__); | |
372 | return -ENOMEM; | |
373 | }; | |
374 | ||
375 | fbi->fb.var.xres_virtual = of_mode.xres; | |
376 | fbi->fb.var.yres_virtual = of_mode.yres * 2; | |
377 | fbi->fb.var.bits_per_pixel = bpp; | |
378 | ||
379 | fbi->fb.fix.smem_start = fb_mem_phys; | |
380 | fbi->fb.fix.smem_len = fb_mem_len; | |
381 | fbi->fb.screen_base = fb_mem_virt; | |
382 | fbi->fb.screen_size = fb_mem_len; | |
d6ff7d0f AC |
383 | |
384 | if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) { | |
385 | dev_err(&pdev->dev, "Failed to allocate color map\n"); | |
386 | ret = -ENOMEM; | |
387 | goto failed_free_io; | |
388 | } | |
389 | ||
390 | wm8505fb_init_hw(&fbi->fb); | |
391 | ||
392 | fbi->contrast = 0x80; | |
393 | ret = wm8505fb_set_par(&fbi->fb); | |
394 | if (ret) { | |
395 | dev_err(&pdev->dev, "Failed to set parameters\n"); | |
396 | goto failed_free_cmap; | |
397 | } | |
398 | ||
399 | platform_set_drvdata(pdev, fbi); | |
400 | ||
401 | ret = register_framebuffer(&fbi->fb); | |
402 | if (ret < 0) { | |
403 | dev_err(&pdev->dev, | |
404 | "Failed to register framebuffer device: %d\n", ret); | |
405 | goto failed_free_cmap; | |
406 | } | |
407 | ||
408 | ret = device_create_file(&pdev->dev, &dev_attr_contrast); | |
409 | if (ret < 0) { | |
410 | printk(KERN_WARNING "fb%d: failed to register attributes (%d)\n", | |
411 | fbi->fb.node, ret); | |
412 | } | |
413 | ||
414 | printk(KERN_INFO "fb%d: %s frame buffer at 0x%lx-0x%lx\n", | |
415 | fbi->fb.node, fbi->fb.fix.id, fbi->fb.fix.smem_start, | |
416 | fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1); | |
417 | ||
418 | return 0; | |
419 | ||
420 | failed_free_cmap: | |
421 | if (fbi->fb.cmap.len) | |
422 | fb_dealloc_cmap(&fbi->fb.cmap); | |
423 | failed_free_io: | |
424 | iounmap(fbi->regbase); | |
425 | failed_free_res: | |
426 | release_mem_region(res->start, resource_size(res)); | |
427 | failed_fbi: | |
428 | platform_set_drvdata(pdev, NULL); | |
429 | kfree(fbi); | |
430 | failed: | |
431 | return ret; | |
432 | } | |
433 | ||
434 | static int __devexit wm8505fb_remove(struct platform_device *pdev) | |
435 | { | |
436 | struct wm8505fb_info *fbi = platform_get_drvdata(pdev); | |
437 | struct resource *res; | |
438 | ||
439 | device_remove_file(&pdev->dev, &dev_attr_contrast); | |
440 | ||
441 | unregister_framebuffer(&fbi->fb); | |
442 | ||
443 | writel(0, fbi->regbase); | |
444 | ||
445 | if (fbi->fb.cmap.len) | |
446 | fb_dealloc_cmap(&fbi->fb.cmap); | |
447 | ||
448 | iounmap(fbi->regbase); | |
449 | ||
450 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
451 | release_mem_region(res->start, resource_size(res)); | |
452 | ||
453 | kfree(fbi); | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
e7b99537 TP |
458 | static const struct of_device_id wmt_dt_ids[] = { |
459 | { .compatible = "wm,wm8505-fb", }, | |
460 | {} | |
461 | }; | |
462 | ||
d6ff7d0f AC |
463 | static struct platform_driver wm8505fb_driver = { |
464 | .probe = wm8505fb_probe, | |
465 | .remove = __devexit_p(wm8505fb_remove), | |
466 | .driver = { | |
467 | .owner = THIS_MODULE, | |
468 | .name = DRIVER_NAME, | |
e7b99537 | 469 | .of_match_table = of_match_ptr(wmt_dt_ids), |
d6ff7d0f AC |
470 | }, |
471 | }; | |
472 | ||
4277f2c4 | 473 | module_platform_driver(wm8505fb_driver); |
d6ff7d0f AC |
474 | |
475 | MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>"); | |
476 | MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505"); | |
e7b99537 TP |
477 | MODULE_LICENSE("GPL v2"); |
478 | MODULE_DEVICE_TABLE(of, wmt_dt_ids); |