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9#include <linux/clk.h>
10#include <linux/fb.h>
11#include <linux/io.h>
12#include <linux/lcd.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16#include <linux/regmap.h>
17#include <linux/mfd/syscon.h>
18#include <linux/mfd/syscon/clps711x.h>
19#include <linux/regulator/consumer.h>
20#include <video/of_display_timing.h>
21
22#define CLPS711X_FB_NAME "clps711x-fb"
23#define CLPS711X_FB_BPP_MAX (4)
24
25
26#define CLPS711X_LCDCON (0x0000)
27# define LCDCON_GSEN BIT(30)
28# define LCDCON_GSMD BIT(31)
29#define CLPS711X_PALLSW (0x0280)
30#define CLPS711X_PALMSW (0x02c0)
31#define CLPS711X_FBADDR (0x0d40)
32
33struct clps711x_fb_info {
34 struct clk *clk;
35 void __iomem *base;
36 struct regmap *syscon;
37 resource_size_t buffsize;
38 struct fb_videomode mode;
39 struct regulator *lcd_pwr;
40 u32 ac_prescale;
41 bool cmap_invert;
42};
43
44static int clps711x_fb_setcolreg(u_int regno, u_int red, u_int green,
45 u_int blue, u_int transp, struct fb_info *info)
46{
47 struct clps711x_fb_info *cfb = info->par;
48 u32 level, mask, shift;
49
50 if (regno >= BIT(info->var.bits_per_pixel))
51 return -EINVAL;
52
53 shift = 4 * (regno & 7);
54 mask = 0xf << shift;
55
56 level = (((red * 77 + green * 151 + blue * 28) >> 20) << shift) & mask;
57 if (cfb->cmap_invert)
58 level = 0xf - level;
59
60 regno = (regno < 8) ? CLPS711X_PALLSW : CLPS711X_PALMSW;
61
62 writel((readl(cfb->base + regno) & ~mask) | level, cfb->base + regno);
63
64 return 0;
65}
66
67static int clps711x_fb_check_var(struct fb_var_screeninfo *var,
68 struct fb_info *info)
69{
70 u32 val;
71
72 if (var->bits_per_pixel < 1 ||
73 var->bits_per_pixel > CLPS711X_FB_BPP_MAX)
74 return -EINVAL;
75
76 if (!var->pixclock)
77 return -EINVAL;
78
79 val = DIV_ROUND_UP(var->xres, 16) - 1;
80 if (val < 0x01 || val > 0x3f)
81 return -EINVAL;
82
83 val = DIV_ROUND_UP(var->yres * var->xres * var->bits_per_pixel, 128);
84 val--;
85 if (val < 0x001 || val > 0x1fff)
86 return -EINVAL;
87
88 var->transp.msb_right = 0;
89 var->transp.offset = 0;
90 var->transp.length = 0;
91 var->red.msb_right = 0;
92 var->red.offset = 0;
93 var->red.length = var->bits_per_pixel;
94 var->green = var->red;
95 var->blue = var->red;
96 var->grayscale = var->bits_per_pixel > 1;
97
98 return 0;
99}
100
101static int clps711x_fb_set_par(struct fb_info *info)
102{
103 struct clps711x_fb_info *cfb = info->par;
104 resource_size_t size;
105 u32 lcdcon, pps;
106
107 size = (info->var.xres * info->var.yres * info->var.bits_per_pixel) / 8;
108 if (size > cfb->buffsize)
109 return -EINVAL;
110
111 switch (info->var.bits_per_pixel) {
112 case 1:
113 info->fix.visual = FB_VISUAL_MONO01;
114 break;
115 case 2:
116 case 4:
117 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
118 break;
119 default:
120 return -EINVAL;
121 }
122
123 info->fix.line_length = info->var.xres * info->var.bits_per_pixel / 8;
124 info->fix.smem_len = size;
125
126 lcdcon = (info->var.xres * info->var.yres *
127 info->var.bits_per_pixel) / 128 - 1;
128 lcdcon |= ((info->var.xres / 16) - 1) << 13;
129 lcdcon |= (cfb->ac_prescale & 0x1f) << 25;
130
131 pps = clk_get_rate(cfb->clk) / (PICOS2KHZ(info->var.pixclock) * 1000);
132 if (pps)
133 pps--;
134 lcdcon |= (pps & 0x3f) << 19;
135
136 if (info->var.bits_per_pixel == 4)
137 lcdcon |= LCDCON_GSMD;
138 if (info->var.bits_per_pixel >= 2)
139 lcdcon |= LCDCON_GSEN;
140
141
142 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
143 writel(lcdcon, cfb->base + CLPS711X_LCDCON);
144 regmap_update_bits(cfb->syscon, SYSCON_OFFSET,
145 SYSCON1_LCDEN, SYSCON1_LCDEN);
146
147 return 0;
148}
149
150static int clps711x_fb_blank(int blank, struct fb_info *info)
151{
152
153 return 0;
154}
155
156static const struct fb_ops clps711x_fb_ops = {
157 .owner = THIS_MODULE,
158 .fb_setcolreg = clps711x_fb_setcolreg,
159 .fb_check_var = clps711x_fb_check_var,
160 .fb_set_par = clps711x_fb_set_par,
161 .fb_blank = clps711x_fb_blank,
162 .fb_fillrect = sys_fillrect,
163 .fb_copyarea = sys_copyarea,
164 .fb_imageblit = sys_imageblit,
165};
166
167static int clps711x_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi)
168{
169 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
170
171 return (!fi || fi->par == cfb) ? 1 : 0;
172}
173
174static int clps711x_lcd_get_power(struct lcd_device *lcddev)
175{
176 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
177
178 if (!IS_ERR_OR_NULL(cfb->lcd_pwr))
179 if (!regulator_is_enabled(cfb->lcd_pwr))
180 return FB_BLANK_NORMAL;
181
182 return FB_BLANK_UNBLANK;
183}
184
185static int clps711x_lcd_set_power(struct lcd_device *lcddev, int blank)
186{
187 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
188
189 if (!IS_ERR_OR_NULL(cfb->lcd_pwr)) {
190 if (blank == FB_BLANK_UNBLANK) {
191 if (!regulator_is_enabled(cfb->lcd_pwr))
192 return regulator_enable(cfb->lcd_pwr);
193 } else {
194 if (regulator_is_enabled(cfb->lcd_pwr))
195 return regulator_disable(cfb->lcd_pwr);
196 }
197 }
198
199 return 0;
200}
201
202static struct lcd_ops clps711x_lcd_ops = {
203 .check_fb = clps711x_lcd_check_fb,
204 .get_power = clps711x_lcd_get_power,
205 .set_power = clps711x_lcd_set_power,
206};
207
208static int clps711x_fb_probe(struct platform_device *pdev)
209{
210 struct device *dev = &pdev->dev;
211 struct device_node *disp, *np = dev->of_node;
212 struct clps711x_fb_info *cfb;
213 struct lcd_device *lcd;
214 struct fb_info *info;
215 struct resource *res;
216 int ret = -ENOENT;
217 u32 val;
218
219 if (fb_get_options(CLPS711X_FB_NAME, NULL))
220 return -ENODEV;
221
222 info = framebuffer_alloc(sizeof(*cfb), dev);
223 if (!info)
224 return -ENOMEM;
225
226 cfb = info->par;
227 platform_set_drvdata(pdev, info);
228
229 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
230 if (!res)
231 goto out_fb_release;
232 cfb->base = devm_ioremap(dev, res->start, resource_size(res));
233 if (!cfb->base) {
234 ret = -ENOMEM;
235 goto out_fb_release;
236 }
237
238 info->fix.mmio_start = res->start;
239 info->fix.mmio_len = resource_size(res);
240
241 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
242 info->screen_base = devm_ioremap_resource(dev, res);
243 if (IS_ERR(info->screen_base)) {
244 ret = PTR_ERR(info->screen_base);
245 goto out_fb_release;
246 }
247
248
249 if (res->start & 0x0fffffff) {
250 ret = -EINVAL;
251 goto out_fb_release;
252 }
253
254 info->apertures = alloc_apertures(1);
255 if (!info->apertures) {
256 ret = -ENOMEM;
257 goto out_fb_release;
258 }
259
260 cfb->buffsize = resource_size(res);
261 info->fix.smem_start = res->start;
262 info->apertures->ranges[0].base = info->fix.smem_start;
263 info->apertures->ranges[0].size = cfb->buffsize;
264
265 cfb->clk = devm_clk_get(dev, NULL);
266 if (IS_ERR(cfb->clk)) {
267 ret = PTR_ERR(cfb->clk);
268 goto out_fb_release;
269 }
270
271 cfb->syscon =
272 syscon_regmap_lookup_by_compatible("cirrus,ep7209-syscon1");
273 if (IS_ERR(cfb->syscon)) {
274 ret = PTR_ERR(cfb->syscon);
275 goto out_fb_release;
276 }
277
278 disp = of_parse_phandle(np, "display", 0);
279 if (!disp) {
280 dev_err(&pdev->dev, "No display defined\n");
281 ret = -ENODATA;
282 goto out_fb_release;
283 }
284
285 ret = of_get_fb_videomode(disp, &cfb->mode, OF_USE_NATIVE_MODE);
286 if (ret) {
287 of_node_put(disp);
288 goto out_fb_release;
289 }
290
291 of_property_read_u32(disp, "ac-prescale", &cfb->ac_prescale);
292 cfb->cmap_invert = of_property_read_bool(disp, "cmap-invert");
293
294 ret = of_property_read_u32(disp, "bits-per-pixel",
295 &info->var.bits_per_pixel);
296 of_node_put(disp);
297 if (ret)
298 goto out_fb_release;
299
300
301 if (info->fix.smem_start != (readb(cfb->base + CLPS711X_FBADDR) << 28))
302 regmap_update_bits(cfb->syscon, SYSCON_OFFSET,
303 SYSCON1_LCDEN, 0);
304
305 ret = regmap_read(cfb->syscon, SYSCON_OFFSET, &val);
306 if (ret)
307 goto out_fb_release;
308
309 if (!(val & SYSCON1_LCDEN)) {
310
311 writeb(info->fix.smem_start >> 28, cfb->base + CLPS711X_FBADDR);
312
313 memset_io(info->screen_base, 0, cfb->buffsize);
314 }
315
316 cfb->lcd_pwr = devm_regulator_get(dev, "lcd");
317 if (PTR_ERR(cfb->lcd_pwr) == -EPROBE_DEFER) {
318 ret = -EPROBE_DEFER;
319 goto out_fb_release;
320 }
321
322 info->fbops = &clps711x_fb_ops;
323 info->flags = FBINFO_DEFAULT;
324 info->var.activate = FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
325 info->var.height = -1;
326 info->var.width = -1;
327 info->var.vmode = FB_VMODE_NONINTERLACED;
328 info->fix.type = FB_TYPE_PACKED_PIXELS;
329 info->fix.accel = FB_ACCEL_NONE;
330 strlcpy(info->fix.id, CLPS711X_FB_NAME, sizeof(info->fix.id));
331 fb_videomode_to_var(&info->var, &cfb->mode);
332
333 ret = fb_alloc_cmap(&info->cmap, BIT(CLPS711X_FB_BPP_MAX), 0);
334 if (ret)
335 goto out_fb_release;
336
337 ret = fb_set_var(info, &info->var);
338 if (ret)
339 goto out_fb_dealloc_cmap;
340
341 ret = register_framebuffer(info);
342 if (ret)
343 goto out_fb_dealloc_cmap;
344
345 lcd = devm_lcd_device_register(dev, "clps711x-lcd", dev, cfb,
346 &clps711x_lcd_ops);
347 if (!IS_ERR(lcd))
348 return 0;
349
350 ret = PTR_ERR(lcd);
351 unregister_framebuffer(info);
352
353out_fb_dealloc_cmap:
354 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
355 fb_dealloc_cmap(&info->cmap);
356
357out_fb_release:
358 framebuffer_release(info);
359
360 return ret;
361}
362
363static int clps711x_fb_remove(struct platform_device *pdev)
364{
365 struct fb_info *info = platform_get_drvdata(pdev);
366 struct clps711x_fb_info *cfb = info->par;
367
368 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
369
370 unregister_framebuffer(info);
371 fb_dealloc_cmap(&info->cmap);
372 framebuffer_release(info);
373
374 return 0;
375}
376
377static const struct of_device_id clps711x_fb_dt_ids[] = {
378 { .compatible = "cirrus,ep7209-fb", },
379 { }
380};
381MODULE_DEVICE_TABLE(of, clps711x_fb_dt_ids);
382
383static struct platform_driver clps711x_fb_driver = {
384 .driver = {
385 .name = CLPS711X_FB_NAME,
386 .of_match_table = clps711x_fb_dt_ids,
387 },
388 .probe = clps711x_fb_probe,
389 .remove = clps711x_fb_remove,
390};
391module_platform_driver(clps711x_fb_driver);
392
393MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
394MODULE_DESCRIPTION("Cirrus Logic CLPS711X FB driver");
395MODULE_LICENSE("GPL");
396
