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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
30enum {
31 FB_GET_WIDTH = 0x00,
32 FB_GET_HEIGHT = 0x04,
33 FB_INT_STATUS = 0x08,
34 FB_INT_ENABLE = 0x0c,
35 FB_SET_BASE = 0x10,
36 FB_SET_ROTATION = 0x14,
37 FB_SET_BLANK = 0x18,
38 FB_GET_PHYS_WIDTH = 0x1c,
39 FB_GET_PHYS_HEIGHT = 0x20,
40
41 FB_INT_VSYNC = 1U << 0,
42 FB_INT_BASE_UPDATE_DONE = 1U << 1
43};
44
45struct goldfish_fb {
46 void __iomem *reg_base;
47 int irq;
48 spinlock_t lock;
49 wait_queue_head_t wait;
50 int base_update_count;
51 int rotation;
52 struct fb_info fb;
53 u32 cmap[16];
54};
55
56static irqreturn_t goldfish_fb_interrupt(int irq, void *dev_id)
57{
58 unsigned long irq_flags;
59 struct goldfish_fb *fb = dev_id;
60 u32 status;
61
62 spin_lock_irqsave(&fb->lock, irq_flags);
63 status = readl(fb->reg_base + FB_INT_STATUS);
64 if (status & FB_INT_BASE_UPDATE_DONE) {
65 fb->base_update_count++;
66 wake_up(&fb->wait);
67 }
68 spin_unlock_irqrestore(&fb->lock, irq_flags);
69 return status ? IRQ_HANDLED : IRQ_NONE;
70}
71
72static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
73{
74 unsigned int mask = (1 << bf->length) - 1;
75
76 return (val >> (16 - bf->length) & mask) << bf->offset;
77}
78
79static int
80goldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
81 unsigned int blue, unsigned int transp, struct fb_info *info)
82{
83 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
84
85 if (regno < 16) {
86 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
87 convert_bitfield(blue, &fb->fb.var.blue) |
88 convert_bitfield(green, &fb->fb.var.green) |
89 convert_bitfield(red, &fb->fb.var.red);
90 return 0;
91 } else {
92 return 1;
93 }
94}
95
96static int goldfish_fb_check_var(struct fb_var_screeninfo *var,
97 struct fb_info *info)
98{
99 if ((var->rotate & 1) != (info->var.rotate & 1)) {
100 if ((var->xres != info->var.yres) ||
101 (var->yres != info->var.xres) ||
102 (var->xres_virtual != info->var.yres) ||
103 (var->yres_virtual > info->var.xres * 2) ||
104 (var->yres_virtual < info->var.xres)) {
105 return -EINVAL;
106 }
107 } else {
108 if ((var->xres != info->var.xres) ||
109 (var->yres != info->var.yres) ||
110 (var->xres_virtual != info->var.xres) ||
111 (var->yres_virtual > info->var.yres * 2) ||
112 (var->yres_virtual < info->var.yres)) {
113 return -EINVAL;
114 }
115 }
116 if ((var->xoffset != info->var.xoffset) ||
117 (var->bits_per_pixel != info->var.bits_per_pixel) ||
118 (var->grayscale != info->var.grayscale)) {
119 return -EINVAL;
120 }
121 return 0;
122}
123
124static int goldfish_fb_set_par(struct fb_info *info)
125{
126 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
127 if (fb->rotation != fb->fb.var.rotate) {
128 info->fix.line_length = info->var.xres * 2;
129 fb->rotation = fb->fb.var.rotate;
130 writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);
131 }
132 return 0;
133}
134
135
136static int goldfish_fb_pan_display(struct fb_var_screeninfo *var,
137 struct fb_info *info)
138{
139 unsigned long irq_flags;
140 int base_update_count;
141 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
142
143 spin_lock_irqsave(&fb->lock, irq_flags);
144 base_update_count = fb->base_update_count;
145 writel(fb->fb.fix.smem_start + fb->fb.var.xres * 2 * var->yoffset,
146 fb->reg_base + FB_SET_BASE);
147 spin_unlock_irqrestore(&fb->lock, irq_flags);
148 wait_event_timeout(fb->wait,
149 fb->base_update_count != base_update_count, HZ / 15);
150 if (fb->base_update_count == base_update_count)
151 pr_err("goldfish_fb_pan_display: timeout waiting for base update\n");
152 return 0;
153}
154
155static int goldfish_fb_blank(int blank, struct fb_info *info)
156{
157 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
158 switch (blank) {
159 case FB_BLANK_NORMAL:
160 writel(1, fb->reg_base + FB_SET_BLANK);
161 break;
162 case FB_BLANK_UNBLANK:
163 writel(0, fb->reg_base + FB_SET_BLANK);
164 break;
165 }
166 return 0;
167}
168
169static struct fb_ops goldfish_fb_ops = {
170 .owner = THIS_MODULE,
171 .fb_check_var = goldfish_fb_check_var,
172 .fb_set_par = goldfish_fb_set_par,
173 .fb_setcolreg = goldfish_fb_setcolreg,
174 .fb_pan_display = goldfish_fb_pan_display,
175 .fb_blank = goldfish_fb_blank,
176 .fb_fillrect = cfb_fillrect,
177 .fb_copyarea = cfb_copyarea,
178 .fb_imageblit = cfb_imageblit,
179};
180
181
182static int goldfish_fb_probe(struct platform_device *pdev)
183{
184 int ret;
185 struct resource *r;
186 struct goldfish_fb *fb;
187 size_t framesize;
188 u32 width, height;
189 dma_addr_t fbpaddr;
190
191 fb = kzalloc(sizeof(*fb), GFP_KERNEL);
192 if (fb == NULL) {
193 ret = -ENOMEM;
194 goto err_fb_alloc_failed;
195 }
196 spin_lock_init(&fb->lock);
197 init_waitqueue_head(&fb->wait);
198 platform_set_drvdata(pdev, fb);
199
200 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
201 if (r == NULL) {
202 ret = -ENODEV;
203 goto err_no_io_base;
204 }
205 fb->reg_base = ioremap(r->start, PAGE_SIZE);
206 if (fb->reg_base == NULL) {
207 ret = -ENOMEM;
208 goto err_no_io_base;
209 }
210
211 fb->irq = platform_get_irq(pdev, 0);
212 if (fb->irq <= 0) {
213 ret = -ENODEV;
214 goto err_no_irq;
215 }
216
217 width = readl(fb->reg_base + FB_GET_WIDTH);
218 height = readl(fb->reg_base + FB_GET_HEIGHT);
219
220 fb->fb.fbops = &goldfish_fb_ops;
221 fb->fb.flags = FBINFO_FLAG_DEFAULT;
222 fb->fb.pseudo_palette = fb->cmap;
223 fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
224 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
225 fb->fb.fix.line_length = width * 2;
226 fb->fb.fix.accel = FB_ACCEL_NONE;
227 fb->fb.fix.ypanstep = 1;
228
229 fb->fb.var.xres = width;
230 fb->fb.var.yres = height;
231 fb->fb.var.xres_virtual = width;
232 fb->fb.var.yres_virtual = height * 2;
233 fb->fb.var.bits_per_pixel = 16;
234 fb->fb.var.activate = FB_ACTIVATE_NOW;
235 fb->fb.var.height = readl(fb->reg_base + FB_GET_PHYS_HEIGHT);
236 fb->fb.var.width = readl(fb->reg_base + FB_GET_PHYS_WIDTH);
237 fb->fb.var.pixclock = 10000;
238
239 fb->fb.var.red.offset = 11;
240 fb->fb.var.red.length = 5;
241 fb->fb.var.green.offset = 5;
242 fb->fb.var.green.length = 6;
243 fb->fb.var.blue.offset = 0;
244 fb->fb.var.blue.length = 5;
245
246 framesize = width * height * 2 * 2;
247 fb->fb.screen_base = (char __force __iomem *)dma_alloc_coherent(
248 &pdev->dev, framesize,
249 &fbpaddr, GFP_KERNEL);
250 pr_debug("allocating frame buffer %d * %d, got %p\n",
251 width, height, fb->fb.screen_base);
252 if (fb->fb.screen_base == NULL) {
253 ret = -ENOMEM;
254 goto err_alloc_screen_base_failed;
255 }
256 fb->fb.fix.smem_start = fbpaddr;
257 fb->fb.fix.smem_len = framesize;
258
259 ret = fb_set_var(&fb->fb, &fb->fb.var);
260 if (ret)
261 goto err_fb_set_var_failed;
262
263 ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED,
264 pdev->name, fb);
265 if (ret)
266 goto err_request_irq_failed;
267
268 writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE);
269 goldfish_fb_pan_display(&fb->fb.var, &fb->fb);
270
271 ret = register_framebuffer(&fb->fb);
272 if (ret)
273 goto err_register_framebuffer_failed;
274 return 0;
275
276err_register_framebuffer_failed:
277 free_irq(fb->irq, fb);
278err_request_irq_failed:
279err_fb_set_var_failed:
280 dma_free_coherent(&pdev->dev, framesize,
281 (void *)fb->fb.screen_base,
282 fb->fb.fix.smem_start);
283err_alloc_screen_base_failed:
284err_no_irq:
285 iounmap(fb->reg_base);
286err_no_io_base:
287 kfree(fb);
288err_fb_alloc_failed:
289 return ret;
290}
291
292static int goldfish_fb_remove(struct platform_device *pdev)
293{
294 size_t framesize;
295 struct goldfish_fb *fb = platform_get_drvdata(pdev);
296
297 framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual * 2;
298 unregister_framebuffer(&fb->fb);
299 free_irq(fb->irq, fb);
300
301 dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base,
302 fb->fb.fix.smem_start);
303 iounmap(fb->reg_base);
304 return 0;
305}
306
307static const struct of_device_id goldfish_fb_of_match[] = {
308 { .compatible = "google,goldfish-fb", },
309 {},
310};
311MODULE_DEVICE_TABLE(of, goldfish_fb_of_match);
312
313static struct platform_driver goldfish_fb_driver = {
314 .probe = goldfish_fb_probe,
315 .remove = goldfish_fb_remove,
316 .driver = {
317 .name = "goldfish_fb",
318 .of_match_table = goldfish_fb_of_match,
319 }
320};
321
322module_platform_driver(goldfish_fb_driver);
323
324MODULE_LICENSE("GPL v2");
325
