1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
|
/*
* Copyright (C) 2007 Google, Inc.
* Copyright (C) 2012 Intel, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
enum {
FB_GET_WIDTH = 0x00,
FB_GET_HEIGHT = 0x04,
FB_INT_STATUS = 0x08,
FB_INT_ENABLE = 0x0c,
FB_SET_BASE = 0x10,
FB_SET_ROTATION = 0x14,
FB_SET_BLANK = 0x18,
FB_GET_PHYS_WIDTH = 0x1c,
FB_GET_PHYS_HEIGHT = 0x20,
FB_INT_VSYNC = 1U << 0,
FB_INT_BASE_UPDATE_DONE = 1U << 1
};
struct goldfish_fb {
void __iomem *reg_base;
int irq;
spinlock_t lock;
wait_queue_head_t wait;
int base_update_count;
int rotation;
struct fb_info fb;
u32 cmap[16];
};
static irqreturn_t goldfish_fb_interrupt(int irq, void *dev_id)
{
unsigned long irq_flags;
struct goldfish_fb *fb = dev_id;
u32 status;
spin_lock_irqsave(&fb->lock, irq_flags);
status = readl(fb->reg_base + FB_INT_STATUS);
if (status & FB_INT_BASE_UPDATE_DONE) {
fb->base_update_count++;
wake_up(&fb->wait);
}
spin_unlock_irqrestore(&fb->lock, irq_flags);
return status ? IRQ_HANDLED : IRQ_NONE;
}
static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
{
unsigned int mask = (1 << bf->length) - 1;
return (val >> (16 - bf->length) & mask) << bf->offset;
}
static int
goldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
unsigned int blue, unsigned int transp, struct fb_info *info)
{
struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
if (regno < 16) {
fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
convert_bitfield(blue, &fb->fb.var.blue) |
convert_bitfield(green, &fb->fb.var.green) |
convert_bitfield(red, &fb->fb.var.red);
return 0;
} else {
return 1;
}
}
static int goldfish_fb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
if ((var->rotate & 1) != (info->var.rotate & 1)) {
if ((var->xres != info->var.yres) ||
(var->yres != info->var.xres) ||
(var->xres_virtual != info->var.yres) ||
(var->yres_virtual > info->var.xres * 2) ||
(var->yres_virtual < info->var.xres)) {
return -EINVAL;
}
} else {
if ((var->xres != info->var.xres) ||
(var->yres != info->var.yres) ||
(var->xres_virtual != info->var.xres) ||
(var->yres_virtual > info->var.yres * 2) ||
(var->yres_virtual < info->var.yres)) {
return -EINVAL;
}
}
if ((var->xoffset != info->var.xoffset) ||
(var->bits_per_pixel != info->var.bits_per_pixel) ||
(var->grayscale != info->var.grayscale)) {
return -EINVAL;
}
return 0;
}
static int goldfish_fb_set_par(struct fb_info *info)
{
struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
if (fb->rotation != fb->fb.var.rotate) {
info->fix.line_length = info->var.xres * 2;
fb->rotation = fb->fb.var.rotate;
writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);
}
return 0;
}
static int goldfish_fb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
unsigned long irq_flags;
int base_update_count;
struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
spin_lock_irqsave(&fb->lock, irq_flags);
base_update_count = fb->base_update_count;
writel(fb->fb.fix.smem_start + fb->fb.var.xres * 2 * var->yoffset,
fb->reg_base + FB_SET_BASE);
spin_unlock_irqrestore(&fb->lock, irq_flags);
wait_event_timeout(fb->wait,
fb->base_update_count != base_update_count, HZ / 15);
if (fb->base_update_count == base_update_count)
pr_err("goldfish_fb_pan_display: timeout waiting for base update\n");
return 0;
}
static int goldfish_fb_blank(int blank, struct fb_info *info)
{
struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
switch (blank) {
case FB_BLANK_NORMAL:
writel(1, fb->reg_base + FB_SET_BLANK);
break;
case FB_BLANK_UNBLANK:
writel(0, fb->reg_base + FB_SET_BLANK);
break;
}
return 0;
}
static struct fb_ops goldfish_fb_ops = {
.owner = THIS_MODULE,
.fb_check_var = goldfish_fb_check_var,
.fb_set_par = goldfish_fb_set_par,
.fb_setcolreg = goldfish_fb_setcolreg,
.fb_pan_display = goldfish_fb_pan_display,
.fb_blank = goldfish_fb_blank,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
static int goldfish_fb_probe(struct platform_device *pdev)
{
int ret;
struct resource *r;
struct goldfish_fb *fb;
size_t framesize;
u32 width, height;
dma_addr_t fbpaddr;
fb = kzalloc(sizeof(*fb), GFP_KERNEL);
if (fb == NULL) {
ret = -ENOMEM;
goto err_fb_alloc_failed;
}
spin_lock_init(&fb->lock);
init_waitqueue_head(&fb->wait);
platform_set_drvdata(pdev, fb);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
ret = -ENODEV;
goto err_no_io_base;
}
fb->reg_base = ioremap(r->start, PAGE_SIZE);
if (fb->reg_base == NULL) {
ret = -ENOMEM;
goto err_no_io_base;
}
fb->irq = platform_get_irq(pdev, 0);
if (fb->irq <= 0) {
ret = -ENODEV;
goto err_no_irq;
}
width = readl(fb->reg_base + FB_GET_WIDTH);
height = readl(fb->reg_base + FB_GET_HEIGHT);
fb->fb.fbops = &goldfish_fb_ops;
fb->fb.flags = FBINFO_FLAG_DEFAULT;
fb->fb.pseudo_palette = fb->cmap;
fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
fb->fb.fix.line_length = width * 2;
fb->fb.fix.accel = FB_ACCEL_NONE;
<
|