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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ef74d46a AS |
2 | /* |
3 | * Cirrus Logic CLPS711X FB driver | |
4 | * | |
5 | * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru> | |
6 | * Based on driver by Russell King <rmk@arm.linux.org.uk> | |
ef74d46a AS |
7 | */ |
8 | ||
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 | /* Registers relative to LCDCON */ | |
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 | ||
33 | struct 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 | ||
44 | static 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 | /* gray = 0.30*R + 0.58*G + 0.11*B */ | |
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 | ||
67 | static 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 | ||
101 | static 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 | /* LCDCON must only be changed while the LCD is disabled */ | |
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 | ||
150 | static int clps711x_fb_blank(int blank, struct fb_info *info) | |
151 | { | |
152 | /* Return happy */ | |
153 | return 0; | |
154 | } | |
155 | ||
156 | static 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 | ||
167 | static 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 | ||
174 | static 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 | ||
185 | static 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 | ||
202 | static 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 | ||
208 | static 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 | /* Physical address should be aligned to 256 MiB */ | |
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 = | |
564c9741 | 272 | syscon_regmap_lookup_by_compatible("cirrus,ep7209-syscon1"); |
ef74d46a AS |
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); | |
fdac7513 AK |
286 | if (ret) { |
287 | of_node_put(disp); | |
ef74d46a | 288 | goto out_fb_release; |
fdac7513 | 289 | } |
ef74d46a AS |
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); | |
fdac7513 | 296 | of_node_put(disp); |
ef74d46a AS |
297 | if (ret) |
298 | goto out_fb_release; | |
299 | ||
300 | /* Force disable LCD on any mismatch */ | |
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 | /* Setup start FB address */ | |
311 | writeb(info->fix.smem_start >> 28, cfb->base + CLPS711X_FBADDR); | |
312 | /* Clean FB memory */ | |
b1f46dd1 | 313 | memset_io(info->screen_base, 0, cfb->buffsize); |
ef74d46a AS |
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 | ||
353 | out_fb_dealloc_cmap: | |
354 | regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0); | |
355 | fb_dealloc_cmap(&info->cmap); | |
356 | ||
357 | out_fb_release: | |
358 | framebuffer_release(info); | |
359 | ||
360 | return ret; | |
361 | } | |
362 | ||
363 | static 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 | ||
377 | static const struct of_device_id clps711x_fb_dt_ids[] = { | |
564c9741 | 378 | { .compatible = "cirrus,ep7209-fb", }, |
ef74d46a AS |
379 | { } |
380 | }; | |
381 | MODULE_DEVICE_TABLE(of, clps711x_fb_dt_ids); | |
382 | ||
383 | static struct platform_driver clps711x_fb_driver = { | |
384 | .driver = { | |
385 | .name = CLPS711X_FB_NAME, | |
ef74d46a AS |
386 | .of_match_table = clps711x_fb_dt_ids, |
387 | }, | |
388 | .probe = clps711x_fb_probe, | |
389 | .remove = clps711x_fb_remove, | |
390 | }; | |
391 | module_platform_driver(clps711x_fb_driver); | |
392 | ||
393 | MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); | |
394 | MODULE_DESCRIPTION("Cirrus Logic CLPS711X FB driver"); | |
395 | MODULE_LICENSE("GPL"); |