1 /*
2 * Copyright (C) 2007 Google, Inc.
3 * Copyright (C) 2012 Intel, Inc.
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/errno.h>
20 #include <linux/string.h>
21 #include <linux/slab.h>
22 #include <linux/delay.h>
23 #include <linux/mm.h>
24 #include <linux/fb.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/ioport.h>
28 #include <linux/platform_device.h>
29 #include <linux/acpi.h>
30
31 enum {
32 FB_GET_WIDTH = 0x00,
33 FB_GET_HEIGHT = 0x04,
34 FB_INT_STATUS = 0x08,
35 FB_INT_ENABLE = 0x0c,
36 FB_SET_BASE = 0x10,
37 FB_SET_ROTATION = 0x14,
38 FB_SET_BLANK = 0x18,
39 FB_GET_PHYS_WIDTH = 0x1c,
40 FB_GET_PHYS_HEIGHT = 0x20,
41 FB_GET_FORMAT = 0x24,
42
43 FB_INT_VSYNC = 1U << 0,
44 FB_INT_BASE_UPDATE_DONE = 1U << 1
45 };
46
47 /* These values *must* match the platform definitions found under
48 * <system/graphics.h>
49 */
50 enum {
51 HAL_PIXEL_FORMAT_RGBA_8888 = 1,
52 HAL_PIXEL_FORMAT_RGBX_8888 = 2,
53 HAL_PIXEL_FORMAT_RGB_888 = 3,
54 HAL_PIXEL_FORMAT_RGB_565 = 4,
55 HAL_PIXEL_FORMAT_BGRA_8888 = 5,
56 };
57
58 struct framebuffer_config {
59 u8 bytes_per_pixel;
60 u8 red_offset;
61 u8 red_length;
62 u8 green_offset;
63 u8 green_length;
64 u8 blue_offset;
65 u8 blue_length;
66 u8 transp_offset;
67 u8 transp_length;
68 };
69
get_fb_config_from_format(int format)70 static const struct framebuffer_config* get_fb_config_from_format(int format) {
71 static const struct framebuffer_config fb_configs[] = {
72 { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* Invalid, assume RGB_565 */
73 { 4, 0, 8, 8, 8, 16, 8, 24, 8 }, /* HAL_PIXEL_FORMAT_RGBA_8888 */
74 { 4, 0, 8, 8, 8, 16, 8, 0, 0 }, /* HAL_PIXEL_FORMAT_RGBX_8888 */
75 { 3, 0, 8, 8, 8, 16, 8, 0, 0 }, /* HAL_PIXEL_FORMAT_RGB_888 */
76 { 2, 11, 5, 5, 6, 0, 5, 0, 0 }, /* HAL_PIXEL_FORMAT_RGB_565 */
77 { 4, 16, 8, 8, 8, 0, 8, 24, 8 }, /* HAL_PIXEL_FORMAT_BGRA_8888 */
78 };
79
80 if (format > 0 &&
81 format < sizeof(fb_configs) / sizeof(struct framebuffer_config)) {
82 return &fb_configs[format];
83 }
84
85 return &fb_configs[HAL_PIXEL_FORMAT_RGB_565]; /* legacy default */
86 }
87
88 struct goldfish_fb {
89 void __iomem *reg_base;
90 int irq;
91 spinlock_t lock;
92 wait_queue_head_t wait;
93 int base_update_count;
94 int rotation;
95 struct fb_info fb;
96 u32 cmap[16];
97 };
98
goldfish_fb_interrupt(int irq,void * dev_id)99 static irqreturn_t goldfish_fb_interrupt(int irq, void *dev_id)
100 {
101 unsigned long irq_flags;
102 struct goldfish_fb *fb = dev_id;
103 u32 status;
104
105 spin_lock_irqsave(&fb->lock, irq_flags);
106 status = readl(fb->reg_base + FB_INT_STATUS);
107 if (status & FB_INT_BASE_UPDATE_DONE) {
108 fb->base_update_count++;
109 wake_up(&fb->wait);
110 }
111 spin_unlock_irqrestore(&fb->lock, irq_flags);
112 return status ? IRQ_HANDLED : IRQ_NONE;
113 }
114
convert_bitfield(int val,struct fb_bitfield * bf)115 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
116 {
117 unsigned int mask = (1 << bf->length) - 1;
118
119 return (val >> (16 - bf->length) & mask) << bf->offset;
120 }
121
122 static int
goldfish_fb_setcolreg(unsigned int regno,unsigned int red,unsigned int green,unsigned int blue,unsigned int transp,struct fb_info * info)123 goldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
124 unsigned int blue, unsigned int transp, struct fb_info *info)
125 {
126 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
127
128 if (regno < 16) {
129 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
130 convert_bitfield(blue, &fb->fb.var.blue) |
131 convert_bitfield(green, &fb->fb.var.green) |
132 convert_bitfield(red, &fb->fb.var.red);
133 return 0;
134 } else {
135 return 1;
136 }
137 }
138
goldfish_fb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)139 static int goldfish_fb_check_var(struct fb_var_screeninfo *var,
140 struct fb_info *info)
141 {
142 if ((var->rotate & 1) != (info->var.rotate & 1)) {
143 if ((var->xres != info->var.yres) ||
144 (var->yres != info->var.xres) ||
145 (var->xres_virtual != info->var.yres) ||
146 (var->yres_virtual > info->var.xres * 2) ||
147 (var->yres_virtual < info->var.xres)) {
148 return -EINVAL;
149 }
150 } else {
151 if ((var->xres != info->var.xres) ||
152 (var->yres != info->var.yres) ||
153 (var->xres_virtual != info->var.xres) ||
154 (var->yres_virtual > info->var.yres * 2) ||
155 (var->yres_virtual < info->var.yres)) {
156 return -EINVAL;
157 }
158 }
159 if ((var->xoffset != info->var.xoffset) ||
160 (var->bits_per_pixel != info->var.bits_per_pixel) ||
161 (var->grayscale != info->var.grayscale)) {
162 return -EINVAL;
163 }
164 return 0;
165 }
166
goldfish_fb_set_par(struct fb_info * info)167 static int goldfish_fb_set_par(struct fb_info *info)
168 {
169 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
170 if (fb->rotation != fb->fb.var.rotate) {
171 info->fix.line_length = info->var.xres *
172 (fb->fb.var.bits_per_pixel / 8);
173 fb->rotation = fb->fb.var.rotate;
174 writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);
175 }
176 return 0;
177 }
178
179
goldfish_fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)180 static int goldfish_fb_pan_display(struct fb_var_screeninfo *var,
181 struct fb_info *info)
182 {
183 unsigned long irq_flags;
184 int base_update_count;
185 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
186
187 spin_lock_irqsave(&fb->lock, irq_flags);
188 base_update_count = fb->base_update_count;
189 writel(fb->fb.fix.smem_start +
190 fb->fb.var.xres * (fb->fb.var.bits_per_pixel / 8) * var->yoffset,
191 fb->reg_base + FB_SET_BASE);
192 spin_unlock_irqrestore(&fb->lock, irq_flags);
193 wait_event_timeout(fb->wait,
194 fb->base_update_count != base_update_count, HZ / 15);
195 if (fb->base_update_count == base_update_count)
196 pr_err("goldfish_fb_pan_display: timeout waiting for base update\n");
197 return 0;
198 }
199
goldfish_fb_blank(int blank,struct fb_info * info)200 static int goldfish_fb_blank(int blank, struct fb_info *info)
201 {
202 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
203 switch (blank) {
204 case FB_BLANK_NORMAL:
205 writel(1, fb->reg_base + FB_SET_BLANK);
206 break;
207 case FB_BLANK_UNBLANK:
208 writel(0, fb->reg_base + FB_SET_BLANK);
209 break;
210 }
211 return 0;
212 }
213
214 static struct fb_ops goldfish_fb_ops = {
215 .owner = THIS_MODULE,
216 .fb_check_var = goldfish_fb_check_var,
217 .fb_set_par = goldfish_fb_set_par,
218 .fb_setcolreg = goldfish_fb_setcolreg,
219 .fb_pan_display = goldfish_fb_pan_display,
220 .fb_blank = goldfish_fb_blank,
221 .fb_fillrect = cfb_fillrect,
222 .fb_copyarea = cfb_copyarea,
223 .fb_imageblit = cfb_imageblit,
224 };
225
226
goldfish_fb_probe(struct platform_device * pdev)227 static int goldfish_fb_probe(struct platform_device *pdev)
228 {
229 int ret;
230 struct resource *r;
231 struct goldfish_fb *fb;
232 size_t framesize;
233 u32 width, height, format;
234 int bytes_per_pixel;
235 dma_addr_t fbpaddr;
236 const struct framebuffer_config* fb_config;
237
238 fb = kzalloc(sizeof(*fb), GFP_KERNEL);
239 if (fb == NULL) {
240 ret = -ENOMEM;
241 goto err_fb_alloc_failed;
242 }
243 spin_lock_init(&fb->lock);
244 init_waitqueue_head(&fb->wait);
245 platform_set_drvdata(pdev, fb);
246
247 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
248 if (r == NULL) {
249 ret = -ENODEV;
250 goto err_no_io_base;
251 }
252 fb->reg_base = ioremap(r->start, PAGE_SIZE);
253 if (fb->reg_base == NULL) {
254 ret = -ENOMEM;
255 goto err_no_io_base;
256 }
257
258 fb->irq = platform_get_irq(pdev, 0);
259 if (fb->irq <= 0) {
260 ret = -ENODEV;
261 goto err_no_irq;
262 }
263
264 width = readl(fb->reg_base + FB_GET_WIDTH);
265 height = readl(fb->reg_base + FB_GET_HEIGHT);
266 format = readl(fb->reg_base + FB_GET_FORMAT);
267 fb_config = get_fb_config_from_format(format);
268 if (!fb_config) {
269 ret = -EINVAL;
270 goto err_no_irq;
271 }
272 bytes_per_pixel = fb_config->bytes_per_pixel;
273
274 fb->fb.fbops = &goldfish_fb_ops;
275 fb->fb.flags = FBINFO_FLAG_DEFAULT;
276 fb->fb.pseudo_palette = fb->cmap;
277 fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
278 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
279 fb->fb.fix.line_length = width * bytes_per_pixel;
280 fb->fb.fix.accel = FB_ACCEL_NONE;
281 fb->fb.fix.ypanstep = 1;
282
283 fb->fb.var.xres = width;
284 fb->fb.var.yres = height;
285 fb->fb.var.xres_virtual = width;
286 fb->fb.var.yres_virtual = height * 2;
287 fb->fb.var.bits_per_pixel = bytes_per_pixel * 8;
288 fb->fb.var.activate = FB_ACTIVATE_NOW;
289 fb->fb.var.height = readl(fb->reg_base + FB_GET_PHYS_HEIGHT);
290 fb->fb.var.width = readl(fb->reg_base + FB_GET_PHYS_WIDTH);
291 fb->fb.var.pixclock = 0;
292
293 fb->fb.var.red.offset = fb_config->red_offset;
294 fb->fb.var.red.length = fb_config->red_length;
295 fb->fb.var.green.offset = fb_config->green_offset;
296 fb->fb.var.green.length = fb_config->green_length;
297 fb->fb.var.blue.offset = fb_config->blue_offset;
298 fb->fb.var.blue.length = fb_config->blue_length;
299 fb->fb.var.transp.offset = fb_config->transp_offset;
300 fb->fb.var.transp.length = fb_config->transp_length;
301
302 framesize = width * height * 2 * bytes_per_pixel;
303 fb->fb.screen_base = (char __force __iomem *)dma_alloc_coherent(
304 &pdev->dev, framesize,
305 &fbpaddr, GFP_KERNEL);
306 pr_debug("allocating frame buffer %d * %d, got %p\n",
307 width, height, fb->fb.screen_base);
308 if (fb->fb.screen_base == NULL) {
309 ret = -ENOMEM;
310 goto err_alloc_screen_base_failed;
311 }
312 fb->fb.fix.smem_start = fbpaddr;
313 fb->fb.fix.smem_len = framesize;
314
315 ret = fb_set_var(&fb->fb, &fb->fb.var);
316 if (ret)
317 goto err_fb_set_var_failed;
318
319 ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED,
320 pdev->name, fb);
321 if (ret)
322 goto err_request_irq_failed;
323
324 writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE);
325 goldfish_fb_pan_display(&fb->fb.var, &fb->fb); /* updates base */
326
327 ret = register_framebuffer(&fb->fb);
328 if (ret)
329 goto err_register_framebuffer_failed;
330 return 0;
331
332 err_register_framebuffer_failed:
333 free_irq(fb->irq, fb);
334 err_request_irq_failed:
335 err_fb_set_var_failed:
336 dma_free_coherent(&pdev->dev, framesize,
337 (void *)fb->fb.screen_base,
338 fb->fb.fix.smem_start);
339 err_alloc_screen_base_failed:
340 err_no_irq:
341 iounmap(fb->reg_base);
342 err_no_io_base:
343 kfree(fb);
344 err_fb_alloc_failed:
345 return ret;
346 }
347
goldfish_fb_remove(struct platform_device * pdev)348 static int goldfish_fb_remove(struct platform_device *pdev)
349 {
350 size_t framesize;
351 struct goldfish_fb *fb = platform_get_drvdata(pdev);
352
353 framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual *
354 (fb->fb.var.bits_per_pixel / 8);
355 unregister_framebuffer(&fb->fb);
356 free_irq(fb->irq, fb);
357
358 dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base,
359 fb->fb.fix.smem_start);
360 iounmap(fb->reg_base);
361 return 0;
362 }
363
364 static const struct of_device_id goldfish_fb_of_match[] = {
365 { .compatible = "generic,goldfish-fb", },
366 {},
367 };
368 MODULE_DEVICE_TABLE(of, goldfish_fb_of_match);
369
370 static const struct acpi_device_id goldfish_fb_acpi_match[] = {
371 { "GFSH0004", 0 },
372 { },
373 };
374 MODULE_DEVICE_TABLE(acpi, goldfish_fb_acpi_match);
375
376 static struct platform_driver goldfish_fb_driver = {
377 .probe = goldfish_fb_probe,
378 .remove = goldfish_fb_remove,
379 .driver = {
380 .name = "goldfish_fb",
381 .owner = THIS_MODULE,
382 .of_match_table = goldfish_fb_of_match,
383 .acpi_match_table = ACPI_PTR(goldfish_fb_acpi_match),
384 }
385 };
386
387 module_platform_driver(goldfish_fb_driver);
388
389 MODULE_LICENSE("GPL v2");
390