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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#include <linux/acpi.h>
30
31enum {
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
42 FB_INT_VSYNC = 1U << 0,
43 FB_INT_BASE_UPDATE_DONE = 1U << 1
44};
45
46struct goldfish_fb {
47 void __iomem *reg_base;
48 int irq;
49 spinlock_t lock;
50 wait_queue_head_t wait;
51 int base_update_count;
52 int rotation;
53 struct fb_info fb;
54 u32 cmap[16];
55};
56
57static irqreturn_t goldfish_fb_interrupt(int irq, void *dev_id)
58{
59 unsigned long irq_flags;
60 struct goldfish_fb *fb = dev_id;
61 u32 status;
62
63 spin_lock_irqsave(&fb->lock, irq_flags);
64 status = readl(fb->reg_base + FB_INT_STATUS);
65 if (status & FB_INT_BASE_UPDATE_DONE) {
66 fb->base_update_count++;
67 wake_up(&fb->wait);
68 }
69 spin_unlock_irqrestore(&fb->lock, irq_flags);
70 return status ? IRQ_HANDLED : IRQ_NONE;
71}
72
73static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
74{
75 unsigned int mask = (1 << bf->length) - 1;
76
77 return (val >> (16 - bf->length) & mask) << bf->offset;
78}
79
80static int
81goldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
82 unsigned int blue, unsigned int transp, struct fb_info *info)
83{
84 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
85
86 if (regno < 16) {
87 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
88 convert_bitfield(blue, &fb->fb.var.blue) |
89 convert_bitfield(green, &fb->fb.var.green) |
90 convert_bitfield(red, &fb->fb.var.red);
91 return 0;
92 } else {
93 return 1;
94 }
95}
96
97static int goldfish_fb_check_var(struct fb_var_screeninfo *var,
98 struct fb_info *info)
99{
100 if ((var->rotate & 1) != (info->var.rotate & 1)) {
101 if ((var->xres != info->var.yres) ||
102 (var->yres != info->var.xres) ||
103 (var->xres_virtual != info->var.yres) ||
104 (var->yres_virtual > info->var.xres * 2) ||
105 (var->yres_virtual < info->var.xres)) {
106 return -EINVAL;
107 }
108 } else {
109 if ((var->xres != info->var.xres) ||
110 (var->yres != info->var.yres) ||
111 (var->xres_virtual != info->var.xres) ||
112 (var->yres_virtual > info->var.yres * 2) ||
113 (var->yres_virtual < info->var.yres)) {
114 return -EINVAL;
115 }
116 }
117 if ((var->xoffset != info->var.xoffset) ||
118 (var->bits_per_pixel != info->var.bits_per_pixel) ||
119 (var->grayscale != info->var.grayscale)) {
120 return -EINVAL;
121 }
122 return 0;
123}
124
125static int goldfish_fb_set_par(struct fb_info *info)
126{
127 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
128
129 if (fb->rotation != fb->fb.var.rotate) {
130 info->fix.line_length = info->var.xres * 2;
131 fb->rotation = fb->fb.var.rotate;
132 writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);
133 }
134 return 0;
135}
136
137
138static int goldfish_fb_pan_display(struct fb_var_screeninfo *var,
139 struct fb_info *info)
140{
141 unsigned long irq_flags;
142 int base_update_count;
143 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
144
145 spin_lock_irqsave(&fb->lock, irq_flags);
146 base_update_count = fb->base_update_count;
147 writel(fb->fb.fix.smem_start + fb->fb.var.xres * 2 * var->yoffset,
148 fb->reg_base + FB_SET_BASE);
149 spin_unlock_irqrestore(&fb->lock, irq_flags);
150 wait_event_timeout(fb->wait,
151 fb->base_update_count != base_update_count, HZ / 15);
152 if (fb->base_update_count == base_update_count)
153 pr_err("%s: timeout waiting for base update\n", __func__);
154 return 0;
155}
156
157static int goldfish_fb_blank(int blank, struct fb_info *info)
158{
159 struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
160
161 switch (blank) {
162 case FB_BLANK_NORMAL:
163 writel(1, fb->reg_base + FB_SET_BLANK);
164 break;
165 case FB_BLANK_UNBLANK:
166 writel(0, fb->reg_base + FB_SET_BLANK);
167 break;
168 }
169 return 0;
170}
171
172static struct fb_ops goldfish_fb_ops = {
173 .owner = THIS_MODULE,
174 .fb_check_var = goldfish_fb_check_var,
175 .fb_set_par = goldfish_fb_set_par,
176 .fb_setcolreg = goldfish_fb_setcolreg,
177 .fb_pan_display = goldfish_fb_pan_display,
178 .fb_blank = goldfish_fb_blank,
179 .fb_fillrect = cfb_fillrect,
180 .fb_copyarea = cfb_copyarea,
181 .fb_imageblit = cfb_imageblit,
182};
183
184
185static int goldfish_fb_probe(struct platform_device *pdev)
186{
187 int ret;
188 struct resource *r;
189 struct goldfish_fb *fb;
190 size_t framesize;
191 u32 width, height;
192 dma_addr_t fbpaddr;
193
194 fb = kzalloc(sizeof(*fb), GFP_KERNEL);
195 if (fb == NULL) {
196 ret = -ENOMEM;
197 goto err_fb_alloc_failed;
198 }
199 spin_lock_init(&fb->lock);
200 init_waitqueue_head(&fb->wait);
201 platform_set_drvdata(pdev, fb);
202
203 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
204 if (r == NULL) {
205 ret = -ENODEV;
206 goto err_no_io_base;
207 }
208 fb->reg_base = ioremap(r->start, PAGE_SIZE);
209 if (fb->reg_base == NULL) {
210 ret = -ENOMEM;
211 goto err_no_io_base;
212 }
213
214 fb->irq = platform_get_irq(pdev, 0);
215 if (fb->irq <= 0) {
216 ret = -ENODEV;
217 goto err_no_irq;
218 }
219
220 width = readl(fb->reg_base + FB_GET_WIDTH);
221 height = readl(fb->reg_base + FB_GET_HEIGHT);
222
223 fb->fb.fbops = &goldfish_fb_ops;
224 fb->fb.flags = FBINFO_FLAG_DEFAULT;
225 fb->fb.pseudo_palette = fb->cmap;
226 fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
227 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
228 fb->fb.fix.line_length = width * 2;
229 fb->fb.fix.accel = FB_ACCEL_NONE;
230 fb->fb.fix.ypanstep = 1;
231
232 fb->fb.var.xres = width;
233 fb->fb.var.yres = height;
234 fb->fb.var.xres_virtual = width;
235 fb->fb.var.yres_virtual = height * 2;
236 fb->fb.var.bits_per_pixel = 16;
237 fb->fb.var.activate = FB_ACTIVATE_NOW;
238 fb->fb.var.height = readl(fb->reg_base + FB_GET_PHYS_HEIGHT);
239 fb->fb.var.width = readl(fb->reg_base + FB_GET_PHYS_WIDTH);
240 fb->fb.var.pixclock = 0;
241
242 fb->fb.var.red.offset = 11;
243 fb->fb.var.red.length = 5;
244 fb->fb.var.green.offset = 5;
245 fb->fb.var.green.length = 6;
246 fb->fb.var.blue.offset = 0;
247 fb->fb.var.blue.length = 5;
248
249 framesize = width * height * 2 * 2;
250 fb->fb.screen_base = (char __force __iomem *)dma_alloc_coherent(
251 &pdev->dev, framesize,
252 &fbpaddr, GFP_KERNEL);
253 pr_debug("allocating frame buffer %d * %d, got %p\n",
254 width, height, fb->fb.screen_base);
255 if (fb->fb.screen_base == NULL) {
256 ret = -ENOMEM;
257 goto err_alloc_screen_base_failed;
258 }
259 fb->fb.fix.smem_start = fbpaddr;
260 fb->fb.fix.smem_len = framesize;
261
262 ret = fb_set_var(&fb->fb, &fb->fb.var);
263 if (ret)
264 goto err_fb_set_var_failed;
265
266 ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED,
267 pdev->name, fb);
268 if (ret)
269 goto err_request_irq_failed;
270
271 writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE);
272 goldfish_fb_pan_display(&fb->fb.var, &fb->fb);
273
274 ret = register_framebuffer(&fb->fb);
275 if (ret)
276 goto err_register_framebuffer_failed;
277 return 0;
278
279err_register_framebuffer_failed:
280 free_irq(fb->irq, fb);
281err_request_irq_failed:
282err_fb_set_var_failed:
283 dma_free_coherent(&pdev->dev, framesize,
284 (void *)fb->fb.screen_base,
285 fb->fb.fix.smem_start);
286err_alloc_screen_base_failed:
287err_no_irq:
288 iounmap(fb->reg_base);
289err_no_io_base:
290 kfree(fb);
291err_fb_alloc_failed:
292 return ret;
293}
294
295static int goldfish_fb_remove(struct platform_device *pdev)
296{
297 size_t framesize;
298 struct goldfish_fb *fb = platform_get_drvdata(pdev);
299
300 framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual * 2;
301 unregister_framebuffer(&fb->fb);
302 free_irq(fb->irq, fb);
303
304 dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base,
305 fb->fb.fix.smem_start);
306 iounmap(fb->reg_base);
307 kfree(fb);
308 return 0;
309}
310
311static const struct of_device_id goldfish_fb_of_match[] = {
312 { .compatible = "google,goldfish-fb", },
313 {},
314};
315MODULE_DEVICE_TABLE(of, goldfish_fb_of_match);
316
317static const struct acpi_device_id goldfish_fb_acpi_match[] = {
318 { "GFSH0004", 0 },
319 { },
320};
321MODULE_DEVICE_TABLE(acpi, goldfish_fb_acpi_match);
322
323static struct platform_driver goldfish_fb_driver = {
324 .probe = goldfish_fb_probe,
325 .remove = goldfish_fb_remove,
326 .driver = {
327 .name = "goldfish_fb",
328 .of_match_table = goldfish_fb_of_match,
329 .acpi_match_table = ACPI_PTR(goldfish_fb_acpi_match),
330 }
331};
332
333module_platform_driver(goldfish_fb_driver);
334
335MODULE_LICENSE("GPL v2");
336
