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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 | ||
30 | enum { | |
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 | ||
45 | struct 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 | ||
56 | static 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 | ||
72 | static 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 | ||
79 | static int | |
80 | goldfish_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 | ||
96 | static 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 | ||
124 | static 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 | ||
136 | static 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) | |
07f42258 | 151 | pr_err("goldfish_fb_pan_display: timeout waiting for base update\n"); |
c289ba2d AH |
152 | return 0; |
153 | } | |
154 | ||
155 | static 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 | ||
169 | static 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 | ||
182 | static 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); /* updates base */ | |
270 | ||
271 | ret = register_framebuffer(&fb->fb); | |
272 | if (ret) | |
273 | goto err_register_framebuffer_failed; | |
274 | return 0; | |
275 | ||
276 | err_register_framebuffer_failed: | |
277 | free_irq(fb->irq, fb); | |
278 | err_request_irq_failed: | |
279 | err_fb_set_var_failed: | |
280 | dma_free_coherent(&pdev->dev, framesize, | |
281 | (void *)fb->fb.screen_base, | |
282 | fb->fb.fix.smem_start); | |
283 | err_alloc_screen_base_failed: | |
284 | err_no_irq: | |
285 | iounmap(fb->reg_base); | |
286 | err_no_io_base: | |
287 | kfree(fb); | |
288 | err_fb_alloc_failed: | |
289 | return ret; | |
290 | } | |
291 | ||
292 | static 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 | ||
307 | ||
308 | static struct platform_driver goldfish_fb_driver = { | |
309 | .probe = goldfish_fb_probe, | |
310 | .remove = goldfish_fb_remove, | |
311 | .driver = { | |
312 | .name = "goldfish_fb" | |
313 | } | |
314 | }; | |
315 | ||
316 | module_platform_driver(goldfish_fb_driver); | |
317 | ||
318 | MODULE_LICENSE("GPL v2"); |