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26549c8d SW |
1 | /* |
2 | * Simplest possible simple frame-buffer driver, as a platform device | |
3 | * | |
4 | * Copyright (c) 2013, Stephen Warren | |
5 | * | |
6 | * Based on q40fb.c, which was: | |
7 | * Copyright (C) 2001 Richard Zidlicky <rz@linux-m68k.org> | |
8 | * | |
9 | * Also based on offb.c, which was: | |
10 | * Copyright (C) 1997 Geert Uytterhoeven | |
11 | * Copyright (C) 1996 Paul Mackerras | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms and conditions of the GNU General Public License, | |
15 | * version 2, as published by the Free Software Foundation. | |
16 | * | |
17 | * This program is distributed in the hope it will be useful, but WITHOUT | |
18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
20 | * more details. | |
21 | */ | |
22 | ||
23 | #include <linux/errno.h> | |
24 | #include <linux/fb.h> | |
25 | #include <linux/io.h> | |
26 | #include <linux/module.h> | |
5ef76da6 | 27 | #include <linux/platform_data/simplefb.h> |
26549c8d SW |
28 | #include <linux/platform_device.h> |
29 | ||
30 | static struct fb_fix_screeninfo simplefb_fix = { | |
31 | .id = "simple", | |
32 | .type = FB_TYPE_PACKED_PIXELS, | |
33 | .visual = FB_VISUAL_TRUECOLOR, | |
34 | .accel = FB_ACCEL_NONE, | |
35 | }; | |
36 | ||
37 | static struct fb_var_screeninfo simplefb_var = { | |
38 | .height = -1, | |
39 | .width = -1, | |
40 | .activate = FB_ACTIVATE_NOW, | |
41 | .vmode = FB_VMODE_NONINTERLACED, | |
42 | }; | |
43 | ||
44 | static int simplefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
45 | u_int transp, struct fb_info *info) | |
46 | { | |
47 | u32 *pal = info->pseudo_palette; | |
48 | u32 cr = red >> (16 - info->var.red.length); | |
49 | u32 cg = green >> (16 - info->var.green.length); | |
50 | u32 cb = blue >> (16 - info->var.blue.length); | |
51 | u32 value; | |
52 | ||
53 | if (regno >= 16) | |
54 | return -EINVAL; | |
55 | ||
56 | value = (cr << info->var.red.offset) | | |
57 | (cg << info->var.green.offset) | | |
58 | (cb << info->var.blue.offset); | |
59 | if (info->var.transp.length > 0) { | |
60 | u32 mask = (1 << info->var.transp.length) - 1; | |
61 | mask <<= info->var.transp.offset; | |
62 | value |= mask; | |
63 | } | |
64 | pal[regno] = value; | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
498f6d36 DH |
69 | static void simplefb_destroy(struct fb_info *info) |
70 | { | |
71 | if (info->screen_base) | |
72 | iounmap(info->screen_base); | |
73 | } | |
74 | ||
26549c8d SW |
75 | static struct fb_ops simplefb_ops = { |
76 | .owner = THIS_MODULE, | |
498f6d36 | 77 | .fb_destroy = simplefb_destroy, |
26549c8d SW |
78 | .fb_setcolreg = simplefb_setcolreg, |
79 | .fb_fillrect = cfb_fillrect, | |
80 | .fb_copyarea = cfb_copyarea, | |
81 | .fb_imageblit = cfb_imageblit, | |
82 | }; | |
83 | ||
5ef76da6 | 84 | static struct simplefb_format simplefb_formats[] = SIMPLEFB_FORMATS; |
26549c8d SW |
85 | |
86 | struct simplefb_params { | |
87 | u32 width; | |
88 | u32 height; | |
89 | u32 stride; | |
90 | struct simplefb_format *format; | |
91 | }; | |
92 | ||
93 | static int simplefb_parse_dt(struct platform_device *pdev, | |
94 | struct simplefb_params *params) | |
95 | { | |
96 | struct device_node *np = pdev->dev.of_node; | |
97 | int ret; | |
98 | const char *format; | |
99 | int i; | |
100 | ||
101 | ret = of_property_read_u32(np, "width", ¶ms->width); | |
102 | if (ret) { | |
103 | dev_err(&pdev->dev, "Can't parse width property\n"); | |
104 | return ret; | |
105 | } | |
106 | ||
107 | ret = of_property_read_u32(np, "height", ¶ms->height); | |
108 | if (ret) { | |
109 | dev_err(&pdev->dev, "Can't parse height property\n"); | |
110 | return ret; | |
111 | } | |
112 | ||
113 | ret = of_property_read_u32(np, "stride", ¶ms->stride); | |
114 | if (ret) { | |
115 | dev_err(&pdev->dev, "Can't parse stride property\n"); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | ret = of_property_read_string(np, "format", &format); | |
120 | if (ret) { | |
121 | dev_err(&pdev->dev, "Can't parse format property\n"); | |
122 | return ret; | |
123 | } | |
124 | params->format = NULL; | |
125 | for (i = 0; i < ARRAY_SIZE(simplefb_formats); i++) { | |
126 | if (strcmp(format, simplefb_formats[i].name)) | |
127 | continue; | |
128 | params->format = &simplefb_formats[i]; | |
129 | break; | |
130 | } | |
131 | if (!params->format) { | |
132 | dev_err(&pdev->dev, "Invalid format value\n"); | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
5ef76da6 DH |
139 | static int simplefb_parse_pd(struct platform_device *pdev, |
140 | struct simplefb_params *params) | |
141 | { | |
129f1be4 | 142 | struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev); |
5ef76da6 DH |
143 | int i; |
144 | ||
145 | params->width = pd->width; | |
146 | params->height = pd->height; | |
147 | params->stride = pd->stride; | |
148 | ||
149 | params->format = NULL; | |
150 | for (i = 0; i < ARRAY_SIZE(simplefb_formats); i++) { | |
151 | if (strcmp(pd->format, simplefb_formats[i].name)) | |
152 | continue; | |
153 | ||
154 | params->format = &simplefb_formats[i]; | |
155 | break; | |
156 | } | |
157 | ||
158 | if (!params->format) { | |
159 | dev_err(&pdev->dev, "Invalid format value\n"); | |
160 | return -EINVAL; | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
26549c8d SW |
166 | static int simplefb_probe(struct platform_device *pdev) |
167 | { | |
168 | int ret; | |
169 | struct simplefb_params params; | |
170 | struct fb_info *info; | |
171 | struct resource *mem; | |
172 | ||
173 | if (fb_get_options("simplefb", NULL)) | |
174 | return -ENODEV; | |
175 | ||
5ef76da6 | 176 | ret = -ENODEV; |
129f1be4 | 177 | if (dev_get_platdata(&pdev->dev)) |
5ef76da6 DH |
178 | ret = simplefb_parse_pd(pdev, ¶ms); |
179 | else if (pdev->dev.of_node) | |
180 | ret = simplefb_parse_dt(pdev, ¶ms); | |
181 | ||
26549c8d SW |
182 | if (ret) |
183 | return ret; | |
184 | ||
185 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
186 | if (!mem) { | |
187 | dev_err(&pdev->dev, "No memory resource\n"); | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | info = framebuffer_alloc(sizeof(u32) * 16, &pdev->dev); | |
192 | if (!info) | |
193 | return -ENOMEM; | |
194 | platform_set_drvdata(pdev, info); | |
195 | ||
196 | info->fix = simplefb_fix; | |
197 | info->fix.smem_start = mem->start; | |
198 | info->fix.smem_len = resource_size(mem); | |
199 | info->fix.line_length = params.stride; | |
200 | ||
201 | info->var = simplefb_var; | |
202 | info->var.xres = params.width; | |
203 | info->var.yres = params.height; | |
204 | info->var.xres_virtual = params.width; | |
205 | info->var.yres_virtual = params.height; | |
206 | info->var.bits_per_pixel = params.format->bits_per_pixel; | |
207 | info->var.red = params.format->red; | |
208 | info->var.green = params.format->green; | |
209 | info->var.blue = params.format->blue; | |
210 | info->var.transp = params.format->transp; | |
211 | ||
df0960ab DH |
212 | info->apertures = alloc_apertures(1); |
213 | if (!info->apertures) { | |
214 | framebuffer_release(info); | |
215 | return -ENOMEM; | |
216 | } | |
217 | info->apertures->ranges[0].base = info->fix.smem_start; | |
218 | info->apertures->ranges[0].size = info->fix.smem_len; | |
219 | ||
26549c8d | 220 | info->fbops = &simplefb_ops; |
df0960ab | 221 | info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE; |
9e210be6 DH |
222 | info->screen_base = ioremap_wc(info->fix.smem_start, |
223 | info->fix.smem_len); | |
26549c8d SW |
224 | if (!info->screen_base) { |
225 | framebuffer_release(info); | |
226 | return -ENODEV; | |
227 | } | |
228 | info->pseudo_palette = (void *)(info + 1); | |
229 | ||
9f192a92 TG |
230 | dev_info(&pdev->dev, "framebuffer at 0x%lx, 0x%x bytes, mapped to 0x%p\n", |
231 | info->fix.smem_start, info->fix.smem_len, | |
232 | info->screen_base); | |
233 | dev_info(&pdev->dev, "format=%s, mode=%dx%dx%d, linelength=%d\n", | |
234 | params.format->name, | |
235 | info->var.xres, info->var.yres, | |
236 | info->var.bits_per_pixel, info->fix.line_length); | |
237 | ||
26549c8d SW |
238 | ret = register_framebuffer(info); |
239 | if (ret < 0) { | |
240 | dev_err(&pdev->dev, "Unable to register simplefb: %d\n", ret); | |
498f6d36 | 241 | iounmap(info->screen_base); |
26549c8d SW |
242 | framebuffer_release(info); |
243 | return ret; | |
244 | } | |
245 | ||
246 | dev_info(&pdev->dev, "fb%d: simplefb registered!\n", info->node); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static int simplefb_remove(struct platform_device *pdev) | |
252 | { | |
253 | struct fb_info *info = platform_get_drvdata(pdev); | |
254 | ||
255 | unregister_framebuffer(info); | |
256 | framebuffer_release(info); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static const struct of_device_id simplefb_of_match[] = { | |
262 | { .compatible = "simple-framebuffer", }, | |
263 | { }, | |
264 | }; | |
265 | MODULE_DEVICE_TABLE(of, simplefb_of_match); | |
266 | ||
267 | static struct platform_driver simplefb_driver = { | |
268 | .driver = { | |
269 | .name = "simple-framebuffer", | |
270 | .owner = THIS_MODULE, | |
271 | .of_match_table = simplefb_of_match, | |
272 | }, | |
273 | .probe = simplefb_probe, | |
274 | .remove = simplefb_remove, | |
275 | }; | |
276 | module_platform_driver(simplefb_driver); | |
277 | ||
278 | MODULE_AUTHOR("Stephen Warren <swarren@wwwdotorg.org>"); | |
279 | MODULE_DESCRIPTION("Simple framebuffer driver"); | |
280 | MODULE_LICENSE("GPL v2"); |