Blame view
drivers/video/goldfishfb.c
8.27 KB
c289ba2d2
|
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 |
/* * 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) |
07f422588
|
151 152 |
pr_err("goldfish_fb_pan_display: timeout waiting for base update "); |
c289ba2d2
|
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 |
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; fb->fb.fix.ypanstep = 1; fb->fb.var.xres = width; fb->fb.var.yres = height; fb->fb.var.xres_virtual = width; fb->fb.var.yres_virtual = height * 2; fb->fb.var.bits_per_pixel = 16; fb->fb.var.activate = FB_ACTIVATE_NOW; fb->fb.var.height = readl(fb->reg_base + FB_GET_PHYS_HEIGHT); fb->fb.var.width = readl(fb->reg_base + FB_GET_PHYS_WIDTH); fb->fb.var.pixclock = 10000; fb->fb.var.red.offset = 11; fb->fb.var.red.length = 5; fb->fb.var.green.offset = 5; fb->fb.var.green.length = 6; fb->fb.var.blue.offset = 0; fb->fb.var.blue.length = 5; framesize = width * height * 2 * 2; fb->fb.screen_base = (char __force __iomem *)dma_alloc_coherent( &pdev->dev, framesize, &fbpaddr, GFP_KERNEL); pr_debug("allocating frame buffer %d * %d, got %p ", width, height, fb->fb.screen_base); if (fb->fb.screen_base == NULL) { ret = -ENOMEM; goto err_alloc_screen_base_failed; } fb->fb.fix.smem_start = fbpaddr; fb->fb.fix.smem_len = framesize; ret = fb_set_var(&fb->fb, &fb->fb.var); if (ret) goto err_fb_set_var_failed; ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED, pdev->name, fb); if (ret) goto err_request_irq_failed; writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE); goldfish_fb_pan_display(&fb->fb.var, &fb->fb); /* updates base */ ret = register_framebuffer(&fb->fb); if (ret) goto err_register_framebuffer_failed; return 0; err_register_framebuffer_failed: free_irq(fb->irq, fb); err_request_irq_failed: err_fb_set_var_failed: dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base, fb->fb.fix.smem_start); err_alloc_screen_base_failed: err_no_irq: iounmap(fb->reg_base); err_no_io_base: kfree(fb); err_fb_alloc_failed: return ret; } static int goldfish_fb_remove(struct platform_device *pdev) { size_t framesize; struct goldfish_fb *fb = platform_get_drvdata(pdev); framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual * 2; unregister_framebuffer(&fb->fb); free_irq(fb->irq, fb); dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base, fb->fb.fix.smem_start); iounmap(fb->reg_base); return 0; } static struct platform_driver goldfish_fb_driver = { .probe = goldfish_fb_probe, .remove = goldfish_fb_remove, .driver = { .name = "goldfish_fb" } }; module_platform_driver(goldfish_fb_driver); MODULE_LICENSE("GPL v2"); |