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 #include <linux/acpi.h> 30 31 enum { 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 46 struct 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 57 static 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 73 static 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 80 static int 81 goldfish_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 97 static 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 } 124 125 static 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 } 136 137 138 static 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 } 156 157 static 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 } 171 172 static 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 }; 183 184 185 static 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); /* updates base */ 273 274 ret = register_framebuffer(&fb->fb); 275 if (ret) 276 goto err_register_framebuffer_failed; 277 return 0; 278 279 err_register_framebuffer_failed: 280 free_irq(fb->irq, fb); 281 err_request_irq_failed: 282 err_fb_set_var_failed: 283 dma_free_coherent(&pdev->dev, framesize, 284 (void *)fb->fb.screen_base, 285 fb->fb.fix.smem_start); 286 err_alloc_screen_base_failed: 287 err_no_irq: 288 iounmap(fb->reg_base); 289 err_no_io_base: 290 kfree(fb); 291 err_fb_alloc_failed: 292 return ret; 293 } 294 295 static 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 } 310 311 static const struct of_device_id goldfish_fb_of_match[] = { 312 { .compatible = "google,goldfish-fb", }, 313 {}, 314 }; 315 MODULE_DEVICE_TABLE(of, goldfish_fb_of_match); 316 317 static const struct acpi_device_id goldfish_fb_acpi_match[] = { 318 { "GFSH0004", 0 }, 319 { }, 320 }; 321 MODULE_DEVICE_TABLE(acpi, goldfish_fb_acpi_match); 322 323 static 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 }; 332 333 module_platform_driver(goldfish_fb_driver); 334 335 MODULE_LICENSE("GPL v2"); 336