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13#include <linux/clk.h>
14#include <linux/fb.h>
15#include <linux/io.h>
16#include <linux/lcd.h>
17#include <linux/module.h>
18#include <linux/of.h>
19#include <linux/platform_device.h>
20#include <linux/regmap.h>
21#include <linux/mfd/syscon.h>
22#include <linux/mfd/syscon/clps711x.h>
23#include <linux/regulator/consumer.h>
24#include <video/of_display_timing.h>
25
26#define CLPS711X_FB_NAME "clps711x-fb"
27#define CLPS711X_FB_BPP_MAX (4)
28
29
30#define CLPS711X_LCDCON (0x0000)
31# define LCDCON_GSEN BIT(30)
32# define LCDCON_GSMD BIT(31)
33#define CLPS711X_PALLSW (0x0280)
34#define CLPS711X_PALMSW (0x02c0)
35#define CLPS711X_FBADDR (0x0d40)
36
37struct clps711x_fb_info {
38 struct clk *clk;
39 void __iomem *base;
40 struct regmap *syscon;
41 resource_size_t buffsize;
42 struct fb_videomode mode;
43 struct regulator *lcd_pwr;
44 u32 ac_prescale;
45 bool cmap_invert;
46};
47
48static int clps711x_fb_setcolreg(u_int regno, u_int red, u_int green,
49 u_int blue, u_int transp, struct fb_info *info)
50{
51 struct clps711x_fb_info *cfb = info->par;
52 u32 level, mask, shift;
53
54 if (regno >= BIT(info->var.bits_per_pixel))
55 return -EINVAL;
56
57 shift = 4 * (regno & 7);
58 mask = 0xf << shift;
59
60 level = (((red * 77 + green * 151 + blue * 28) >> 20) << shift) & mask;
61 if (cfb->cmap_invert)
62 level = 0xf - level;
63
64 regno = (regno < 8) ? CLPS711X_PALLSW : CLPS711X_PALMSW;
65
66 writel((readl(cfb->base + regno) & ~mask) | level, cfb->base + regno);
67
68 return 0;
69}
70
71static int clps711x_fb_check_var(struct fb_var_screeninfo *var,
72 struct fb_info *info)
73{
74 u32 val;
75
76 if (var->bits_per_pixel < 1 ||
77 var->bits_per_pixel > CLPS711X_FB_BPP_MAX)
78 return -EINVAL;
79
80 if (!var->pixclock)
81 return -EINVAL;
82
83 val = DIV_ROUND_UP(var->xres, 16) - 1;
84 if (val < 0x01 || val > 0x3f)
85 return -EINVAL;
86
87 val = DIV_ROUND_UP(var->yres * var->xres * var->bits_per_pixel, 128);
88 val--;
89 if (val < 0x001 || val > 0x1fff)
90 return -EINVAL;
91
92 var->transp.msb_right = 0;
93 var->transp.offset = 0;
94 var->transp.length = 0;
95 var->red.msb_right = 0;
96 var->red.offset = 0;
97 var->red.length = var->bits_per_pixel;
98 var->green = var->red;
99 var->blue = var->red;
100 var->grayscale = var->bits_per_pixel > 1;
101
102 return 0;
103}
104
105static int clps711x_fb_set_par(struct fb_info *info)
106{
107 struct clps711x_fb_info *cfb = info->par;
108 resource_size_t size;
109 u32 lcdcon, pps;
110
111 size = (info->var.xres * info->var.yres * info->var.bits_per_pixel) / 8;
112 if (size > cfb->buffsize)
113 return -EINVAL;
114
115 switch (info->var.bits_per_pixel) {
116 case 1:
117 info->fix.visual = FB_VISUAL_MONO01;
118 break;
119 case 2:
120 case 4:
121 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
122 break;
123 default:
124 return -EINVAL;
125 }
126
127 info->fix.line_length = info->var.xres * info->var.bits_per_pixel / 8;
128 info->fix.smem_len = size;
129
130 lcdcon = (info->var.xres * info->var.yres *
131 info->var.bits_per_pixel) / 128 - 1;
132 lcdcon |= ((info->var.xres / 16) - 1) << 13;
133 lcdcon |= (cfb->ac_prescale & 0x1f) << 25;
134
135 pps = clk_get_rate(cfb->clk) / (PICOS2KHZ(info->var.pixclock) * 1000);
136 if (pps)
137 pps--;
138 lcdcon |= (pps & 0x3f) << 19;
139
140 if (info->var.bits_per_pixel == 4)
141 lcdcon |= LCDCON_GSMD;
142 if (info->var.bits_per_pixel >= 2)
143 lcdcon |= LCDCON_GSEN;
144
145
146 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
147 writel(lcdcon, cfb->base + CLPS711X_LCDCON);
148 regmap_update_bits(cfb->syscon, SYSCON_OFFSET,
149 SYSCON1_LCDEN, SYSCON1_LCDEN);
150
151 return 0;
152}
153
154static int clps711x_fb_blank(int blank, struct fb_info *info)
155{
156
157 return 0;
158}
159
160static struct fb_ops clps711x_fb_ops = {
161 .owner = THIS_MODULE,
162 .fb_setcolreg = clps711x_fb_setcolreg,
163 .fb_check_var = clps711x_fb_check_var,
164 .fb_set_par = clps711x_fb_set_par,
165 .fb_blank = clps711x_fb_blank,
166 .fb_fillrect = sys_fillrect,
167 .fb_copyarea = sys_copyarea,
168 .fb_imageblit = sys_imageblit,
169};
170
171static int clps711x_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi)
172{
173 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
174
175 return (!fi || fi->par == cfb) ? 1 : 0;
176}
177
178static int clps711x_lcd_get_power(struct lcd_device *lcddev)
179{
180 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
181
182 if (!IS_ERR_OR_NULL(cfb->lcd_pwr))
183 if (!regulator_is_enabled(cfb->lcd_pwr))
184 return FB_BLANK_NORMAL;
185
186 return FB_BLANK_UNBLANK;
187}
188
189static int clps711x_lcd_set_power(struct lcd_device *lcddev, int blank)
190{
191 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
192
193 if (!IS_ERR_OR_NULL(cfb->lcd_pwr)) {
194 if (blank == FB_BLANK_UNBLANK) {
195 if (!regulator_is_enabled(cfb->lcd_pwr))
196 return regulator_enable(cfb->lcd_pwr);
197 } else {
198 if (regulator_is_enabled(cfb->lcd_pwr))
199 return regulator_disable(cfb->lcd_pwr);
200 }
201 }
202
203 return 0;
204}
205
206static struct lcd_ops clps711x_lcd_ops = {
207 .check_fb = clps711x_lcd_check_fb,
208 .get_power = clps711x_lcd_get_power,
209 .set_power = clps711x_lcd_set_power,
210};
211
212static int clps711x_fb_probe(struct platform_device *pdev)
213{
214 struct device *dev = &pdev->dev;
215 struct device_node *disp, *np = dev->of_node;
216 struct clps711x_fb_info *cfb;
217 struct lcd_device *lcd;
218 struct fb_info *info;
219 struct resource *res;
220 int ret = -ENOENT;
221 u32 val;
222
223 if (fb_get_options(CLPS711X_FB_NAME, NULL))
224 return -ENODEV;
225
226 info = framebuffer_alloc(sizeof(*cfb), dev);
227 if (!info)
228 return -ENOMEM;
229
230 cfb = info->par;
231 platform_set_drvdata(pdev, info);
232
233 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
234 if (!res)
235 goto out_fb_release;
236 cfb->base = devm_ioremap(dev, res->start, resource_size(res));
237 if (!cfb->base) {
238 ret = -ENOMEM;
239 goto out_fb_release;
240 }
241
242 info->fix.mmio_start = res->start;
243 info->fix.mmio_len = resource_size(res);
244
245 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
246 info->screen_base = devm_ioremap_resource(dev, res);
247 if (IS_ERR(info->screen_base)) {
248 ret = PTR_ERR(info->screen_base);
249 goto out_fb_release;
250 }
251
252
253 if (res->start & 0x0fffffff) {
254 ret = -EINVAL;
255 goto out_fb_release;
256 }
257
258 info->apertures = alloc_apertures(1);
259 if (!info->apertures) {
260 ret = -ENOMEM;
261 goto out_fb_release;
262 }
263
264 cfb->buffsize = resource_size(res);
265 info->fix.smem_start = res->start;
266 info->apertures->ranges[0].base = info->fix.smem_start;
267 info->apertures->ranges[0].size = cfb->buffsize;
268
269 cfb->clk = devm_clk_get(dev, NULL);
270 if (IS_ERR(cfb->clk)) {
271 ret = PTR_ERR(cfb->clk);
272 goto out_fb_release;
273 }
274
275 cfb->syscon =
276 syscon_regmap_lookup_by_compatible("cirrus,clps711x-syscon1");
277 if (IS_ERR(cfb->syscon)) {
278 ret = PTR_ERR(cfb->syscon);
279 goto out_fb_release;
280 }
281
282 disp = of_parse_phandle(np, "display", 0);
283 if (!disp) {
284 dev_err(&pdev->dev, "No display defined\n");
285 ret = -ENODATA;
286 goto out_fb_release;
287 }
288
289 ret = of_get_fb_videomode(disp, &cfb->mode, OF_USE_NATIVE_MODE);
290 if (ret)
291 goto out_fb_release;
292
293 of_property_read_u32(disp, "ac-prescale", &cfb->ac_prescale);
294 cfb->cmap_invert = of_property_read_bool(disp, "cmap-invert");
295
296 ret = of_property_read_u32(disp, "bits-per-pixel",
297 &info->var.bits_per_pixel);
298 if (ret)
299 goto out_fb_release;
300
301
302 if (info->fix.smem_start != (readb(cfb->base + CLPS711X_FBADDR) << 28))
303 regmap_update_bits(cfb->syscon, SYSCON_OFFSET,
304 SYSCON1_LCDEN, 0);
305
306 ret = regmap_read(cfb->syscon, SYSCON_OFFSET, &val);
307 if (ret)
308 goto out_fb_release;
309
310 if (!(val & SYSCON1_LCDEN)) {
311
312 writeb(info->fix.smem_start >> 28, cfb->base + CLPS711X_FBADDR);
313
314 memset_io(info->screen_base, 0, cfb->buffsize);
315 }
316
317 cfb->lcd_pwr = devm_regulator_get(dev, "lcd");
318 if (PTR_ERR(cfb->lcd_pwr) == -EPROBE_DEFER) {
319 ret = -EPROBE_DEFER;
320 goto out_fb_release;
321 }
322
323 info->fbops = &clps711x_fb_ops;
324 info->flags = FBINFO_DEFAULT;
325 info->var.activate = FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
326 info->var.height = -1;
327 info->var.width = -1;
328 info->var.vmode = FB_VMODE_NONINTERLACED;
329 info->fix.type = FB_TYPE_PACKED_PIXELS;
330 info->fix.accel = FB_ACCEL_NONE;
331 strlcpy(info->fix.id, CLPS711X_FB_NAME, sizeof(info->fix.id));
332 fb_videomode_to_var(&info->var, &cfb->mode);
333
334 ret = fb_alloc_cmap(&info->cmap, BIT(CLPS711X_FB_BPP_MAX), 0);
335 if (ret)
336 goto out_fb_release;
337
338 ret = fb_set_var(info, &info->var);
339 if (ret)
340 goto out_fb_dealloc_cmap;
341
342 ret = register_framebuffer(info);
343 if (ret)
344 goto out_fb_dealloc_cmap;
345
346 lcd = devm_lcd_device_register(dev, "clps711x-lcd", dev, cfb,
347 &clps711x_lcd_ops);
348 if (!IS_ERR(lcd))
349 return 0;
350
351 ret = PTR_ERR(lcd);
352 unregister_framebuffer(info);
353
354out_fb_dealloc_cmap:
355 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
356 fb_dealloc_cmap(&info->cmap);
357
358out_fb_release:
359 framebuffer_release(info);
360
361 return ret;
362}
363
364static int clps711x_fb_remove(struct platform_device *pdev)
365{
366 struct fb_info *info = platform_get_drvdata(pdev);
367 struct clps711x_fb_info *cfb = info->par;
368
369 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
370
371 unregister_framebuffer(info);
372 fb_dealloc_cmap(&info->cmap);
373 framebuffer_release(info);
374
375 return 0;
376}
377
378static const struct of_device_id clps711x_fb_dt_ids[] = {
379 { .compatible = "cirrus,clps711x-fb", },
380 { }
381};
382MODULE_DEVICE_TABLE(of, clps711x_fb_dt_ids);
383
384static struct platform_driver clps711x_fb_driver = {
385 .driver = {
386 .name = CLPS711X_FB_NAME,
387 .of_match_table = clps711x_fb_dt_ids,
388 },
389 .probe = clps711x_fb_probe,
390 .remove = clps711x_fb_remove,
391};
392module_platform_driver(clps711x_fb_driver);
393
394MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
395MODULE_DESCRIPTION("Cirrus Logic CLPS711X FB driver");
396MODULE_LICENSE("GPL");
397
