1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * WonderMedia WM8505 Frame Buffer device driver
4 *
5 * Copyright (C) 2010 Ed Spiridonov <edo.rus@gmail.com>
6 * Based on vt8500lcdfb.c
7 */
8
9 #include <linux/delay.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/fb.h>
12 #include <linux/errno.h>
13 #include <linux/err.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/io.h>
17 #include <linux/kernel.h>
18 #include <linux/memblock.h>
19 #include <linux/mm.h>
20 #include <linux/module.h>
21 #include <linux/of.h>
22 #include <linux/of_fdt.h>
23 #include <linux/platform_device.h>
24 #include <linux/slab.h>
25 #include <linux/string.h>
26 #include <linux/wait.h>
27 #include <video/of_display_timing.h>
28
29 #include "wm8505fb_regs.h"
30 #include "wmt_ge_rops.h"
31
32 #define DRIVER_NAME "wm8505-fb"
33
34 #define to_wm8505fb_info(__info) container_of(__info, \
35 struct wm8505fb_info, fb)
36 struct wm8505fb_info {
37 struct fb_info fb;
38 void __iomem *regbase;
39 unsigned int contrast;
40 };
41
42
wm8505fb_init_hw(struct fb_info * info)43 static int wm8505fb_init_hw(struct fb_info *info)
44 {
45 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
46
47 int i;
48
49 /* I know the purpose only of few registers, so clear unknown */
50 for (i = 0; i < 0x200; i += 4)
51 writel(0, fbi->regbase + i);
52
53 /* Set frame buffer address */
54 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
55 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);
56
57 /*
58 * Set in-memory picture format to RGB
59 * 0x31C sets the correct color mode (RGB565) for WM8650
60 * Bit 8+9 (0x300) are ignored on WM8505 as reserved
61 */
62 writel(0x31c, fbi->regbase + WMT_GOVR_COLORSPACE);
63 writel(1, fbi->regbase + WMT_GOVR_COLORSPACE1);
64
65 /* Virtual buffer size */
66 writel(info->var.xres, fbi->regbase + WMT_GOVR_XRES);
67 writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);
68
69 /* black magic ;) */
70 writel(0xf, fbi->regbase + WMT_GOVR_FHI);
71 writel(4, fbi->regbase + WMT_GOVR_DVO_SET);
72 writel(1, fbi->regbase + WMT_GOVR_MIF_ENABLE);
73 writel(1, fbi->regbase + WMT_GOVR_REG_UPDATE);
74
75 return 0;
76 }
77
wm8505fb_set_timing(struct fb_info * info)78 static int wm8505fb_set_timing(struct fb_info *info)
79 {
80 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
81
82 int h_start = info->var.left_margin;
83 int h_end = h_start + info->var.xres;
84 int h_all = h_end + info->var.right_margin;
85 int h_sync = info->var.hsync_len;
86
87 int v_start = info->var.upper_margin;
88 int v_end = v_start + info->var.yres;
89 int v_all = v_end + info->var.lower_margin;
90 int v_sync = info->var.vsync_len;
91
92 writel(0, fbi->regbase + WMT_GOVR_TG);
93
94 writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);
95 writel(h_end, fbi->regbase + WMT_GOVR_TIMING_H_END);
96 writel(h_all, fbi->regbase + WMT_GOVR_TIMING_H_ALL);
97 writel(h_sync, fbi->regbase + WMT_GOVR_TIMING_H_SYNC);
98
99 writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);
100 writel(v_end, fbi->regbase + WMT_GOVR_TIMING_V_END);
101 writel(v_all, fbi->regbase + WMT_GOVR_TIMING_V_ALL);
102 writel(v_sync, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
103
104 writel(1, fbi->regbase + WMT_GOVR_TG);
105
106 return 0;
107 }
108
109
wm8505fb_set_par(struct fb_info * info)110 static int wm8505fb_set_par(struct fb_info *info)
111 {
112 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
113
114 if (!fbi)
115 return -EINVAL;
116
117 if (info->var.bits_per_pixel == 32) {
118 info->var.red.offset = 16;
119 info->var.red.length = 8;
120 info->var.red.msb_right = 0;
121 info->var.green.offset = 8;
122 info->var.green.length = 8;
123 info->var.green.msb_right = 0;
124 info->var.blue.offset = 0;
125 info->var.blue.length = 8;
126 info->var.blue.msb_right = 0;
127 info->fix.visual = FB_VISUAL_TRUECOLOR;
128 info->fix.line_length = info->var.xres_virtual << 2;
129 } else if (info->var.bits_per_pixel == 16) {
130 info->var.red.offset = 11;
131 info->var.red.length = 5;
132 info->var.red.msb_right = 0;
133 info->var.green.offset = 5;
134 info->var.green.length = 6;
135 info->var.green.msb_right = 0;
136 info->var.blue.offset = 0;
137 info->var.blue.length = 5;
138 info->var.blue.msb_right = 0;
139 info->fix.visual = FB_VISUAL_TRUECOLOR;
140 info->fix.line_length = info->var.xres_virtual << 1;
141 }
142
143 wm8505fb_set_timing(info);
144
145 writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast,
146 fbi->regbase + WMT_GOVR_CONTRAST);
147
148 return 0;
149 }
150
contrast_show(struct device * dev,struct device_attribute * attr,char * buf)151 static ssize_t contrast_show(struct device *dev,
152 struct device_attribute *attr, char *buf)
153 {
154 struct fb_info *info = dev_get_drvdata(dev);
155 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
156
157 return sprintf(buf, "%u\n", fbi->contrast);
158 }
159
contrast_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)160 static ssize_t contrast_store(struct device *dev,
161 struct device_attribute *attr,
162 const char *buf, size_t count)
163 {
164 struct fb_info *info = dev_get_drvdata(dev);
165 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
166 unsigned long tmp;
167
168 if (kstrtoul(buf, 10, &tmp) || (tmp > 0xff))
169 return -EINVAL;
170 fbi->contrast = tmp;
171
172 wm8505fb_set_par(info);
173
174 return count;
175 }
176
177 static DEVICE_ATTR_RW(contrast);
178
179 static struct attribute *wm8505fb_attrs[] = {
180 &dev_attr_contrast.attr,
181 NULL,
182 };
183 ATTRIBUTE_GROUPS(wm8505fb);
184
chan_to_field(u_int chan,struct fb_bitfield * bf)185 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
186 {
187 chan &= 0xffff;
188 chan >>= 16 - bf->length;
189 return chan << bf->offset;
190 }
191
wm8505fb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)192 static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green,
193 unsigned blue, unsigned transp,
194 struct fb_info *info) {
195 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
196 int ret = 1;
197 unsigned int val;
198 if (regno >= 256)
199 return -EINVAL;
200
201 if (info->var.grayscale)
202 red = green = blue =
203 (19595 * red + 38470 * green + 7471 * blue) >> 16;
204
205 switch (fbi->fb.fix.visual) {
206 case FB_VISUAL_TRUECOLOR:
207 if (regno < 16) {
208 u32 *pal = info->pseudo_palette;
209
210 val = chan_to_field(red, &fbi->fb.var.red);
211 val |= chan_to_field(green, &fbi->fb.var.green);
212 val |= chan_to_field(blue, &fbi->fb.var.blue);
213
214 pal[regno] = val;
215 ret = 0;
216 }
217 break;
218 }
219
220 return ret;
221 }
222
wm8505fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)223 static int wm8505fb_pan_display(struct fb_var_screeninfo *var,
224 struct fb_info *info)
225 {
226 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
227
228 writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN);
229 writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN);
230 return 0;
231 }
232
wm8505fb_blank(int blank,struct fb_info * info)233 static int wm8505fb_blank(int blank, struct fb_info *info)
234 {
235 struct wm8505fb_info *fbi = to_wm8505fb_info(info);
236
237 switch (blank) {
238 case FB_BLANK_UNBLANK:
239 wm8505fb_set_timing(info);
240 break;
241 default:
242 writel(0, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
243 break;
244 }
245
246 return 0;
247 }
248
249 static const struct fb_ops wm8505fb_ops = {
250 .owner = THIS_MODULE,
251 .fb_set_par = wm8505fb_set_par,
252 .fb_setcolreg = wm8505fb_setcolreg,
253 .fb_fillrect = wmt_ge_fillrect,
254 .fb_copyarea = wmt_ge_copyarea,
255 .fb_imageblit = sys_imageblit,
256 .fb_sync = wmt_ge_sync,
257 .fb_pan_display = wm8505fb_pan_display,
258 .fb_blank = wm8505fb_blank,
259 };
260
wm8505fb_probe(struct platform_device * pdev)261 static int wm8505fb_probe(struct platform_device *pdev)
262 {
263 struct wm8505fb_info *fbi;
264 struct resource *res;
265 struct display_timings *disp_timing;
266 void *addr;
267 int ret;
268
269 struct fb_videomode mode;
270 u32 bpp;
271 dma_addr_t fb_mem_phys;
272 unsigned long fb_mem_len;
273 void *fb_mem_virt;
274
275 fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) +
276 sizeof(u32) * 16, GFP_KERNEL);
277 if (!fbi)
278 return -ENOMEM;
279
280 strcpy(fbi->fb.fix.id, DRIVER_NAME);
281
282 fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
283 fbi->fb.fix.xpanstep = 1;
284 fbi->fb.fix.ypanstep = 1;
285 fbi->fb.fix.ywrapstep = 0;
286 fbi->fb.fix.accel = FB_ACCEL_NONE;
287
288 fbi->fb.fbops = &wm8505fb_ops;
289 fbi->fb.flags = FBINFO_DEFAULT
290 | FBINFO_HWACCEL_COPYAREA
291 | FBINFO_HWACCEL_FILLRECT
292 | FBINFO_HWACCEL_XPAN
293 | FBINFO_HWACCEL_YPAN
294 | FBINFO_VIRTFB
295 | FBINFO_PARTIAL_PAN_OK;
296 fbi->fb.node = -1;
297
298 addr = fbi;
299 addr = addr + sizeof(struct wm8505fb_info);
300 fbi->fb.pseudo_palette = addr;
301
302 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
303 fbi->regbase = devm_ioremap_resource(&pdev->dev, res);
304 if (IS_ERR(fbi->regbase))
305 return PTR_ERR(fbi->regbase);
306
307 disp_timing = of_get_display_timings(pdev->dev.of_node);
308 if (!disp_timing)
309 return -EINVAL;
310
311 ret = of_get_fb_videomode(pdev->dev.of_node, &mode, OF_USE_NATIVE_MODE);
312 if (ret)
313 return ret;
314
315 ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
316 if (ret)
317 return ret;
318
319 fb_videomode_to_var(&fbi->fb.var, &mode);
320
321 fbi->fb.var.nonstd = 0;
322 fbi->fb.var.activate = FB_ACTIVATE_NOW;
323
324 fbi->fb.var.height = -1;
325 fbi->fb.var.width = -1;
326
327 /* try allocating the framebuffer */
328 fb_mem_len = mode.xres * mode.yres * 2 * (bpp / 8);
329 fb_mem_virt = dmam_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
330 GFP_KERNEL);
331 if (!fb_mem_virt) {
332 pr_err("%s: Failed to allocate framebuffer\n", __func__);
333 return -ENOMEM;
334 }
335
336 fbi->fb.var.xres_virtual = mode.xres;
337 fbi->fb.var.yres_virtual = mode.yres * 2;
338 fbi->fb.var.bits_per_pixel = bpp;
339
340 fbi->fb.fix.smem_start = fb_mem_phys;
341 fbi->fb.fix.smem_len = fb_mem_len;
342 fbi->fb.screen_buffer = fb_mem_virt;
343 fbi->fb.screen_size = fb_mem_len;
344
345 fbi->contrast = 0x10;
346 ret = wm8505fb_set_par(&fbi->fb);
347 if (ret) {
348 dev_err(&pdev->dev, "Failed to set parameters\n");
349 return ret;
350 }
351
352 if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
353 dev_err(&pdev->dev, "Failed to allocate color map\n");
354 return -ENOMEM;
355 }
356
357 wm8505fb_init_hw(&fbi->fb);
358
359 platform_set_drvdata(pdev, fbi);
360
361 ret = register_framebuffer(&fbi->fb);
362 if (ret < 0) {
363 dev_err(&pdev->dev,
364 "Failed to register framebuffer device: %d\n", ret);
365 if (fbi->fb.cmap.len)
366 fb_dealloc_cmap(&fbi->fb.cmap);
367 return ret;
368 }
369
370 fb_info(&fbi->fb, "%s frame buffer at 0x%lx-0x%lx\n",
371 fbi->fb.fix.id, fbi->fb.fix.smem_start,
372 fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);
373
374 return 0;
375 }
376
wm8505fb_remove(struct platform_device * pdev)377 static int wm8505fb_remove(struct platform_device *pdev)
378 {
379 struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
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 return 0;
389 }
390
391 static const struct of_device_id wmt_dt_ids[] = {
392 { .compatible = "wm,wm8505-fb", },
393 {}
394 };
395
396 static struct platform_driver wm8505fb_driver = {
397 .probe = wm8505fb_probe,
398 .remove = wm8505fb_remove,
399 .driver = {
400 .name = DRIVER_NAME,
401 .of_match_table = wmt_dt_ids,
402 .dev_groups = wm8505fb_groups,
403 },
404 };
405
406 module_platform_driver(wm8505fb_driver);
407
408 MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
409 MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
410 MODULE_LICENSE("GPL v2");
411 MODULE_DEVICE_TABLE(of, wmt_dt_ids);
412