Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/video/ep93xx-fb.c |
| 3 | * |
| 4 | * Framebuffer support for the EP93xx series. |
| 5 | * |
| 6 | * Copyright (C) 2007 Bluewater Systems Ltd |
Ryan Mallon | 1c5454e | 2011-06-15 14:45:36 +1000 | [diff] [blame] | 7 | * Author: Ryan Mallon |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 8 | * |
| 9 | * Copyright (c) 2009 H Hartley Sweeten <hsweeten@visionengravers.com> |
| 10 | * |
| 11 | * Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb |
| 12 | * drivers. |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License version 2 as |
| 16 | * published by the Free Software Foundation. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <linux/platform_device.h> |
Paul Gortmaker | 355b200 | 2011-07-03 16:17:28 -0400 | [diff] [blame] | 21 | #include <linux/module.h> |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 22 | #include <linux/dma-mapping.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 23 | #include <linux/slab.h> |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 24 | #include <linux/clk.h> |
| 25 | #include <linux/fb.h> |
| 26 | |
Arnd Bergmann | a3b2924 | 2012-08-24 15:12:11 +0200 | [diff] [blame] | 27 | #include <linux/platform_data/video-ep93xx.h> |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 28 | |
| 29 | /* Vertical Frame Timing Registers */ |
| 30 | #define EP93XXFB_VLINES_TOTAL 0x0000 /* SW locked */ |
| 31 | #define EP93XXFB_VSYNC 0x0004 /* SW locked */ |
| 32 | #define EP93XXFB_VACTIVE 0x0008 /* SW locked */ |
| 33 | #define EP93XXFB_VBLANK 0x0228 /* SW locked */ |
| 34 | #define EP93XXFB_VCLK 0x000c /* SW locked */ |
| 35 | |
| 36 | /* Horizontal Frame Timing Registers */ |
| 37 | #define EP93XXFB_HCLKS_TOTAL 0x0010 /* SW locked */ |
| 38 | #define EP93XXFB_HSYNC 0x0014 /* SW locked */ |
| 39 | #define EP93XXFB_HACTIVE 0x0018 /* SW locked */ |
| 40 | #define EP93XXFB_HBLANK 0x022c /* SW locked */ |
| 41 | #define EP93XXFB_HCLK 0x001c /* SW locked */ |
| 42 | |
| 43 | /* Frame Buffer Memory Configuration Registers */ |
| 44 | #define EP93XXFB_SCREEN_PAGE 0x0028 |
| 45 | #define EP93XXFB_SCREEN_HPAGE 0x002c |
| 46 | #define EP93XXFB_SCREEN_LINES 0x0030 |
| 47 | #define EP93XXFB_LINE_LENGTH 0x0034 |
| 48 | #define EP93XXFB_VLINE_STEP 0x0038 |
| 49 | #define EP93XXFB_LINE_CARRY 0x003c /* SW locked */ |
| 50 | #define EP93XXFB_EOL_OFFSET 0x0230 |
| 51 | |
| 52 | /* Other Video Registers */ |
| 53 | #define EP93XXFB_BRIGHTNESS 0x0020 |
| 54 | #define EP93XXFB_ATTRIBS 0x0024 /* SW locked */ |
| 55 | #define EP93XXFB_SWLOCK 0x007c /* SW locked */ |
| 56 | #define EP93XXFB_AC_RATE 0x0214 |
| 57 | #define EP93XXFB_FIFO_LEVEL 0x0234 |
| 58 | #define EP93XXFB_PIXELMODE 0x0054 |
| 59 | #define EP93XXFB_PIXELMODE_32BPP (0x7 << 0) |
| 60 | #define EP93XXFB_PIXELMODE_24BPP (0x6 << 0) |
| 61 | #define EP93XXFB_PIXELMODE_16BPP (0x4 << 0) |
| 62 | #define EP93XXFB_PIXELMODE_8BPP (0x2 << 0) |
| 63 | #define EP93XXFB_PIXELMODE_SHIFT_1P_24B (0x0 << 3) |
| 64 | #define EP93XXFB_PIXELMODE_SHIFT_1P_18B (0x1 << 3) |
| 65 | #define EP93XXFB_PIXELMODE_COLOR_LUT (0x0 << 10) |
| 66 | #define EP93XXFB_PIXELMODE_COLOR_888 (0x4 << 10) |
| 67 | #define EP93XXFB_PIXELMODE_COLOR_555 (0x5 << 10) |
| 68 | #define EP93XXFB_PARL_IF_OUT 0x0058 |
| 69 | #define EP93XXFB_PARL_IF_IN 0x005c |
| 70 | |
| 71 | /* Blink Control Registers */ |
| 72 | #define EP93XXFB_BLINK_RATE 0x0040 |
| 73 | #define EP93XXFB_BLINK_MASK 0x0044 |
| 74 | #define EP93XXFB_BLINK_PATTRN 0x0048 |
| 75 | #define EP93XXFB_PATTRN_MASK 0x004c |
| 76 | #define EP93XXFB_BKGRND_OFFSET 0x0050 |
| 77 | |
| 78 | /* Hardware Cursor Registers */ |
| 79 | #define EP93XXFB_CURSOR_ADR_START 0x0060 |
| 80 | #define EP93XXFB_CURSOR_ADR_RESET 0x0064 |
| 81 | #define EP93XXFB_CURSOR_SIZE 0x0068 |
| 82 | #define EP93XXFB_CURSOR_COLOR1 0x006c |
| 83 | #define EP93XXFB_CURSOR_COLOR2 0x0070 |
| 84 | #define EP93XXFB_CURSOR_BLINK_COLOR1 0x021c |
| 85 | #define EP93XXFB_CURSOR_BLINK_COLOR2 0x0220 |
| 86 | #define EP93XXFB_CURSOR_XY_LOC 0x0074 |
| 87 | #define EP93XXFB_CURSOR_DSCAN_HY_LOC 0x0078 |
| 88 | #define EP93XXFB_CURSOR_BLINK_RATE_CTRL 0x0224 |
| 89 | |
| 90 | /* LUT Registers */ |
| 91 | #define EP93XXFB_GRY_SCL_LUTR 0x0080 |
| 92 | #define EP93XXFB_GRY_SCL_LUTG 0x0280 |
| 93 | #define EP93XXFB_GRY_SCL_LUTB 0x0300 |
| 94 | #define EP93XXFB_LUT_SW_CONTROL 0x0218 |
| 95 | #define EP93XXFB_LUT_SW_CONTROL_SWTCH (1 << 0) |
| 96 | #define EP93XXFB_LUT_SW_CONTROL_SSTAT (1 << 1) |
| 97 | #define EP93XXFB_COLOR_LUT 0x0400 |
| 98 | |
| 99 | /* Video Signature Registers */ |
| 100 | #define EP93XXFB_VID_SIG_RSLT_VAL 0x0200 |
| 101 | #define EP93XXFB_VID_SIG_CTRL 0x0204 |
| 102 | #define EP93XXFB_VSIG 0x0208 |
| 103 | #define EP93XXFB_HSIG 0x020c |
| 104 | #define EP93XXFB_SIG_CLR_STR 0x0210 |
| 105 | |
| 106 | /* Minimum / Maximum resolutions supported */ |
| 107 | #define EP93XXFB_MIN_XRES 64 |
| 108 | #define EP93XXFB_MIN_YRES 64 |
| 109 | #define EP93XXFB_MAX_XRES 1024 |
| 110 | #define EP93XXFB_MAX_YRES 768 |
| 111 | |
| 112 | struct ep93xx_fbi { |
| 113 | struct ep93xxfb_mach_info *mach_info; |
| 114 | struct clk *clk; |
| 115 | struct resource *res; |
| 116 | void __iomem *mmio_base; |
| 117 | unsigned int pseudo_palette[256]; |
| 118 | }; |
| 119 | |
| 120 | static int check_screenpage_bug = 1; |
| 121 | module_param(check_screenpage_bug, int, 0644); |
| 122 | MODULE_PARM_DESC(check_screenpage_bug, |
| 123 | "Check for bit 27 screen page bug. Default = 1"); |
| 124 | |
| 125 | static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi, |
| 126 | unsigned int off) |
| 127 | { |
| 128 | return __raw_readl(fbi->mmio_base + off); |
| 129 | } |
| 130 | |
| 131 | static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi, |
| 132 | unsigned int val, unsigned int off) |
| 133 | { |
| 134 | __raw_writel(val, fbi->mmio_base + off); |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Write to one of the locked raster registers. |
| 139 | */ |
| 140 | static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi, |
| 141 | unsigned int val, unsigned int reg) |
| 142 | { |
| 143 | /* |
| 144 | * We don't need a lock or delay here since the raster register |
| 145 | * block will remain unlocked until the next access. |
| 146 | */ |
| 147 | ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK); |
| 148 | ep93xxfb_writel(fbi, val, reg); |
| 149 | } |
| 150 | |
| 151 | static void ep93xxfb_set_video_attribs(struct fb_info *info) |
| 152 | { |
| 153 | struct ep93xx_fbi *fbi = info->par; |
| 154 | unsigned int attribs; |
| 155 | |
| 156 | attribs = EP93XXFB_ENABLE; |
| 157 | attribs |= fbi->mach_info->flags; |
| 158 | ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS); |
| 159 | } |
| 160 | |
| 161 | static int ep93xxfb_set_pixelmode(struct fb_info *info) |
| 162 | { |
| 163 | struct ep93xx_fbi *fbi = info->par; |
| 164 | unsigned int val; |
| 165 | |
| 166 | info->var.transp.offset = 0; |
| 167 | info->var.transp.length = 0; |
| 168 | |
| 169 | switch (info->var.bits_per_pixel) { |
| 170 | case 8: |
| 171 | val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT | |
| 172 | EP93XXFB_PIXELMODE_SHIFT_1P_18B; |
| 173 | |
| 174 | info->var.red.offset = 0; |
| 175 | info->var.red.length = 8; |
| 176 | info->var.green.offset = 0; |
| 177 | info->var.green.length = 8; |
| 178 | info->var.blue.offset = 0; |
| 179 | info->var.blue.length = 8; |
| 180 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; |
| 181 | break; |
| 182 | |
| 183 | case 16: |
| 184 | val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 | |
| 185 | EP93XXFB_PIXELMODE_SHIFT_1P_18B; |
| 186 | |
| 187 | info->var.red.offset = 11; |
| 188 | info->var.red.length = 5; |
| 189 | info->var.green.offset = 5; |
| 190 | info->var.green.length = 6; |
| 191 | info->var.blue.offset = 0; |
| 192 | info->var.blue.length = 5; |
| 193 | info->fix.visual = FB_VISUAL_TRUECOLOR; |
| 194 | break; |
| 195 | |
| 196 | case 24: |
| 197 | val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 | |
| 198 | EP93XXFB_PIXELMODE_SHIFT_1P_24B; |
| 199 | |
| 200 | info->var.red.offset = 16; |
| 201 | info->var.red.length = 8; |
| 202 | info->var.green.offset = 8; |
| 203 | info->var.green.length = 8; |
| 204 | info->var.blue.offset = 0; |
| 205 | info->var.blue.length = 8; |
| 206 | info->fix.visual = FB_VISUAL_TRUECOLOR; |
| 207 | break; |
| 208 | |
| 209 | case 32: |
| 210 | val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 | |
| 211 | EP93XXFB_PIXELMODE_SHIFT_1P_24B; |
| 212 | |
| 213 | info->var.red.offset = 16; |
| 214 | info->var.red.length = 8; |
| 215 | info->var.green.offset = 8; |
| 216 | info->var.green.length = 8; |
| 217 | info->var.blue.offset = 0; |
| 218 | info->var.blue.length = 8; |
| 219 | info->fix.visual = FB_VISUAL_TRUECOLOR; |
| 220 | break; |
| 221 | |
| 222 | default: |
| 223 | return -EINVAL; |
| 224 | } |
| 225 | |
| 226 | ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE); |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | static void ep93xxfb_set_timing(struct fb_info *info) |
| 231 | { |
| 232 | struct ep93xx_fbi *fbi = info->par; |
| 233 | unsigned int vlines_total, hclks_total, start, stop; |
| 234 | |
| 235 | vlines_total = info->var.yres + info->var.upper_margin + |
| 236 | info->var.lower_margin + info->var.vsync_len - 1; |
| 237 | |
| 238 | hclks_total = info->var.xres + info->var.left_margin + |
| 239 | info->var.right_margin + info->var.hsync_len - 1; |
| 240 | |
| 241 | ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL); |
| 242 | ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL); |
| 243 | |
| 244 | start = vlines_total; |
| 245 | stop = vlines_total - info->var.vsync_len; |
| 246 | ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC); |
| 247 | |
| 248 | start = vlines_total - info->var.vsync_len - info->var.upper_margin; |
| 249 | stop = info->var.lower_margin - 1; |
| 250 | ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK); |
| 251 | ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE); |
| 252 | |
| 253 | start = vlines_total; |
| 254 | stop = vlines_total + 1; |
| 255 | ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK); |
| 256 | |
| 257 | start = hclks_total; |
| 258 | stop = hclks_total - info->var.hsync_len; |
| 259 | ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC); |
| 260 | |
| 261 | start = hclks_total - info->var.hsync_len - info->var.left_margin; |
| 262 | stop = info->var.right_margin - 1; |
| 263 | ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK); |
| 264 | ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE); |
| 265 | |
| 266 | start = hclks_total; |
| 267 | stop = hclks_total; |
| 268 | ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK); |
| 269 | |
| 270 | ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY); |
| 271 | } |
| 272 | |
| 273 | static int ep93xxfb_set_par(struct fb_info *info) |
| 274 | { |
| 275 | struct ep93xx_fbi *fbi = info->par; |
| 276 | |
| 277 | clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock)); |
| 278 | |
| 279 | ep93xxfb_set_timing(info); |
| 280 | |
| 281 | info->fix.line_length = info->var.xres_virtual * |
| 282 | info->var.bits_per_pixel / 8; |
| 283 | |
| 284 | ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE); |
| 285 | ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES); |
| 286 | ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel) |
| 287 | / 32) - 1, EP93XXFB_LINE_LENGTH); |
| 288 | ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP); |
| 289 | ep93xxfb_set_video_attribs(info); |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static int ep93xxfb_check_var(struct fb_var_screeninfo *var, |
| 294 | struct fb_info *info) |
| 295 | { |
| 296 | int err; |
| 297 | |
| 298 | err = ep93xxfb_set_pixelmode(info); |
| 299 | if (err) |
| 300 | return err; |
| 301 | |
| 302 | var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES); |
| 303 | var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES); |
| 304 | var->xres_virtual = max(var->xres_virtual, var->xres); |
| 305 | |
| 306 | var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES); |
| 307 | var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES); |
| 308 | var->yres_virtual = max(var->yres_virtual, var->yres); |
| 309 | |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma) |
| 314 | { |
| 315 | unsigned int offset = vma->vm_pgoff << PAGE_SHIFT; |
| 316 | |
| 317 | if (offset < info->fix.smem_len) { |
| 318 | return dma_mmap_writecombine(info->dev, vma, info->screen_base, |
| 319 | info->fix.smem_start, |
| 320 | info->fix.smem_len); |
| 321 | } |
| 322 | |
| 323 | return -EINVAL; |
| 324 | } |
| 325 | |
| 326 | static int ep93xxfb_blank(int blank_mode, struct fb_info *info) |
| 327 | { |
| 328 | struct ep93xx_fbi *fbi = info->par; |
| 329 | unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS); |
| 330 | |
| 331 | if (blank_mode) { |
| 332 | if (fbi->mach_info->blank) |
| 333 | fbi->mach_info->blank(blank_mode, info); |
| 334 | ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE, |
| 335 | EP93XXFB_ATTRIBS); |
| 336 | clk_disable(fbi->clk); |
| 337 | } else { |
| 338 | clk_enable(fbi->clk); |
| 339 | ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE, |
| 340 | EP93XXFB_ATTRIBS); |
| 341 | if (fbi->mach_info->blank) |
| 342 | fbi->mach_info->blank(blank_mode, info); |
| 343 | } |
| 344 | |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | static inline int ep93xxfb_convert_color(int val, int width) |
| 349 | { |
| 350 | return ((val << width) + 0x7fff - val) >> 16; |
| 351 | } |
| 352 | |
| 353 | static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red, |
| 354 | unsigned int green, unsigned int blue, |
| 355 | unsigned int transp, struct fb_info *info) |
| 356 | { |
| 357 | struct ep93xx_fbi *fbi = info->par; |
| 358 | unsigned int *pal = info->pseudo_palette; |
| 359 | unsigned int ctrl, i, rgb, lut_current, lut_stat; |
| 360 | |
| 361 | switch (info->fix.visual) { |
| 362 | case FB_VISUAL_PSEUDOCOLOR: |
Krzysztof Helt | 2f39038 | 2009-12-15 16:46:25 -0800 | [diff] [blame] | 363 | if (regno > 255) |
| 364 | return 1; |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 365 | rgb = ((red & 0xff00) << 8) | (green & 0xff00) | |
| 366 | ((blue & 0xff00) >> 8); |
| 367 | |
| 368 | pal[regno] = rgb; |
| 369 | ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2))); |
| 370 | ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL); |
| 371 | lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT); |
| 372 | lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH); |
| 373 | |
| 374 | if (lut_stat == lut_current) { |
| 375 | for (i = 0; i < 256; i++) { |
| 376 | ep93xxfb_writel(fbi, pal[i], |
| 377 | EP93XXFB_COLOR_LUT + (i << 2)); |
| 378 | } |
| 379 | |
| 380 | ep93xxfb_writel(fbi, |
| 381 | ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH, |
| 382 | EP93XXFB_LUT_SW_CONTROL); |
| 383 | } |
| 384 | break; |
| 385 | |
| 386 | case FB_VISUAL_TRUECOLOR: |
| 387 | if (regno > 16) |
| 388 | return 1; |
| 389 | |
| 390 | red = ep93xxfb_convert_color(red, info->var.red.length); |
| 391 | green = ep93xxfb_convert_color(green, info->var.green.length); |
| 392 | blue = ep93xxfb_convert_color(blue, info->var.blue.length); |
| 393 | transp = ep93xxfb_convert_color(transp, |
| 394 | info->var.transp.length); |
| 395 | |
| 396 | pal[regno] = (red << info->var.red.offset) | |
| 397 | (green << info->var.green.offset) | |
| 398 | (blue << info->var.blue.offset) | |
| 399 | (transp << info->var.transp.offset); |
| 400 | break; |
| 401 | |
| 402 | default: |
| 403 | return 1; |
| 404 | } |
| 405 | |
| 406 | return 0; |
| 407 | } |
| 408 | |
| 409 | static struct fb_ops ep93xxfb_ops = { |
| 410 | .owner = THIS_MODULE, |
| 411 | .fb_check_var = ep93xxfb_check_var, |
| 412 | .fb_set_par = ep93xxfb_set_par, |
| 413 | .fb_blank = ep93xxfb_blank, |
| 414 | .fb_fillrect = cfb_fillrect, |
| 415 | .fb_copyarea = cfb_copyarea, |
| 416 | .fb_imageblit = cfb_imageblit, |
| 417 | .fb_setcolreg = ep93xxfb_setcolreg, |
| 418 | .fb_mmap = ep93xxfb_mmap, |
| 419 | }; |
| 420 | |
| 421 | static int __init ep93xxfb_calc_fbsize(struct ep93xxfb_mach_info *mach_info) |
| 422 | { |
| 423 | int i, fb_size = 0; |
| 424 | |
| 425 | if (mach_info->num_modes == EP93XXFB_USE_MODEDB) { |
| 426 | fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES * |
| 427 | mach_info->bpp / 8; |
| 428 | } else { |
| 429 | for (i = 0; i < mach_info->num_modes; i++) { |
| 430 | const struct fb_videomode *mode; |
| 431 | int size; |
| 432 | |
| 433 | mode = &mach_info->modes[i]; |
| 434 | size = mode->xres * mode->yres * mach_info->bpp / 8; |
| 435 | if (size > fb_size) |
| 436 | fb_size = size; |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | return fb_size; |
| 441 | } |
| 442 | |
| 443 | static int __init ep93xxfb_alloc_videomem(struct fb_info *info) |
| 444 | { |
| 445 | struct ep93xx_fbi *fbi = info->par; |
| 446 | char __iomem *virt_addr; |
| 447 | dma_addr_t phys_addr; |
| 448 | unsigned int fb_size; |
| 449 | |
| 450 | fb_size = ep93xxfb_calc_fbsize(fbi->mach_info); |
| 451 | virt_addr = dma_alloc_writecombine(info->dev, fb_size, |
| 452 | &phys_addr, GFP_KERNEL); |
| 453 | if (!virt_addr) |
| 454 | return -ENOMEM; |
| 455 | |
| 456 | /* |
| 457 | * There is a bug in the ep93xx framebuffer which causes problems |
| 458 | * if bit 27 of the physical address is set. |
| 459 | * See: http://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2 |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 460 | * There does not seem to be any official errata for this, but I |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 461 | * have confirmed the problem exists on my hardware (ep9315) at |
| 462 | * least. |
| 463 | */ |
| 464 | if (check_screenpage_bug && phys_addr & (1 << 27)) { |
| 465 | dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) " |
| 466 | "has bit 27 set: cannot init framebuffer\n", |
| 467 | phys_addr); |
| 468 | |
| 469 | dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr); |
| 470 | return -ENOMEM; |
| 471 | } |
| 472 | |
| 473 | info->fix.smem_start = phys_addr; |
| 474 | info->fix.smem_len = fb_size; |
| 475 | info->screen_base = virt_addr; |
| 476 | |
| 477 | return 0; |
| 478 | } |
| 479 | |
| 480 | static void ep93xxfb_dealloc_videomem(struct fb_info *info) |
| 481 | { |
| 482 | if (info->screen_base) |
| 483 | dma_free_coherent(info->dev, info->fix.smem_len, |
| 484 | info->screen_base, info->fix.smem_start); |
| 485 | } |
| 486 | |
Ryan Mallon | c0fdcfa | 2011-01-10 20:49:27 +0100 | [diff] [blame] | 487 | static int __devinit ep93xxfb_probe(struct platform_device *pdev) |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 488 | { |
| 489 | struct ep93xxfb_mach_info *mach_info = pdev->dev.platform_data; |
| 490 | struct fb_info *info; |
| 491 | struct ep93xx_fbi *fbi; |
| 492 | struct resource *res; |
| 493 | char *video_mode; |
| 494 | int err; |
| 495 | |
| 496 | if (!mach_info) |
| 497 | return -EINVAL; |
| 498 | |
| 499 | info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev); |
| 500 | if (!info) |
| 501 | return -ENOMEM; |
| 502 | |
| 503 | info->dev = &pdev->dev; |
| 504 | platform_set_drvdata(pdev, info); |
| 505 | fbi = info->par; |
| 506 | fbi->mach_info = mach_info; |
| 507 | |
| 508 | err = fb_alloc_cmap(&info->cmap, 256, 0); |
| 509 | if (err) |
Julia Lawall | 045dfdb | 2012-04-18 21:37:08 +0200 | [diff] [blame] | 510 | goto failed_cmap; |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 511 | |
| 512 | err = ep93xxfb_alloc_videomem(info); |
| 513 | if (err) |
Julia Lawall | 045dfdb | 2012-04-18 21:37:08 +0200 | [diff] [blame] | 514 | goto failed_videomem; |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 515 | |
| 516 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 517 | if (!res) { |
| 518 | err = -ENXIO; |
Julia Lawall | 045dfdb | 2012-04-18 21:37:08 +0200 | [diff] [blame] | 519 | goto failed_resource; |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 520 | } |
| 521 | |
Ryan Mallon | 0fd1958 | 2012-01-22 20:31:32 +1100 | [diff] [blame] | 522 | /* |
| 523 | * FIXME - We don't do a request_mem_region here because we are |
| 524 | * sharing the register space with the backlight driver (see |
| 525 | * drivers/video/backlight/ep93xx_bl.c) and doing so will cause |
| 526 | * the second loaded driver to return -EBUSY. |
| 527 | * |
| 528 | * NOTE: No locking is required; the backlight does not touch |
| 529 | * any of the framebuffer registers. |
| 530 | */ |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 531 | fbi->res = res; |
Damien Cassou | be86781 | 2012-07-31 15:54:16 +0200 | [diff] [blame] | 532 | fbi->mmio_base = devm_ioremap(&pdev->dev, res->start, |
| 533 | resource_size(res)); |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 534 | if (!fbi->mmio_base) { |
| 535 | err = -ENXIO; |
Julia Lawall | 045dfdb | 2012-04-18 21:37:08 +0200 | [diff] [blame] | 536 | goto failed_resource; |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 537 | } |
| 538 | |
| 539 | strcpy(info->fix.id, pdev->name); |
| 540 | info->fbops = &ep93xxfb_ops; |
| 541 | info->fix.type = FB_TYPE_PACKED_PIXELS; |
| 542 | info->fix.accel = FB_ACCEL_NONE; |
| 543 | info->var.activate = FB_ACTIVATE_NOW; |
| 544 | info->var.vmode = FB_VMODE_NONINTERLACED; |
| 545 | info->flags = FBINFO_DEFAULT; |
| 546 | info->node = -1; |
| 547 | info->state = FBINFO_STATE_RUNNING; |
| 548 | info->pseudo_palette = &fbi->pseudo_palette; |
| 549 | |
| 550 | fb_get_options("ep93xx-fb", &video_mode); |
| 551 | err = fb_find_mode(&info->var, info, video_mode, |
| 552 | fbi->mach_info->modes, fbi->mach_info->num_modes, |
| 553 | fbi->mach_info->default_mode, fbi->mach_info->bpp); |
| 554 | if (err == 0) { |
| 555 | dev_err(info->dev, "No suitable video mode found\n"); |
| 556 | err = -EINVAL; |
Damien Cassou | be86781 | 2012-07-31 15:54:16 +0200 | [diff] [blame] | 557 | goto failed_resource; |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 558 | } |
| 559 | |
| 560 | if (mach_info->setup) { |
| 561 | err = mach_info->setup(pdev); |
| 562 | if (err) |
Damien Cassou | be86781 | 2012-07-31 15:54:16 +0200 | [diff] [blame] | 563 | goto failed_resource; |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | err = ep93xxfb_check_var(&info->var, info); |
| 567 | if (err) |
Julia Lawall | 045dfdb | 2012-04-18 21:37:08 +0200 | [diff] [blame] | 568 | goto failed_check; |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 569 | |
Damien Cassou | be86781 | 2012-07-31 15:54:16 +0200 | [diff] [blame] | 570 | fbi->clk = devm_clk_get(&pdev->dev, NULL); |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 571 | if (IS_ERR(fbi->clk)) { |
| 572 | err = PTR_ERR(fbi->clk); |
| 573 | fbi->clk = NULL; |
Julia Lawall | 045dfdb | 2012-04-18 21:37:08 +0200 | [diff] [blame] | 574 | goto failed_check; |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 575 | } |
| 576 | |
| 577 | ep93xxfb_set_par(info); |
| 578 | clk_enable(fbi->clk); |
| 579 | |
| 580 | err = register_framebuffer(info); |
| 581 | if (err) |
Damien Cassou | be86781 | 2012-07-31 15:54:16 +0200 | [diff] [blame] | 582 | goto failed_check; |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 583 | |
| 584 | dev_info(info->dev, "registered. Mode = %dx%d-%d\n", |
| 585 | info->var.xres, info->var.yres, info->var.bits_per_pixel); |
| 586 | return 0; |
| 587 | |
Julia Lawall | 045dfdb | 2012-04-18 21:37:08 +0200 | [diff] [blame] | 588 | failed_check: |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 589 | if (fbi->mach_info->teardown) |
| 590 | fbi->mach_info->teardown(pdev); |
Julia Lawall | 045dfdb | 2012-04-18 21:37:08 +0200 | [diff] [blame] | 591 | failed_resource: |
| 592 | ep93xxfb_dealloc_videomem(info); |
| 593 | failed_videomem: |
| 594 | fb_dealloc_cmap(&info->cmap); |
| 595 | failed_cmap: |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 596 | kfree(info); |
| 597 | platform_set_drvdata(pdev, NULL); |
| 598 | |
| 599 | return err; |
| 600 | } |
| 601 | |
Ryan Mallon | c0fdcfa | 2011-01-10 20:49:27 +0100 | [diff] [blame] | 602 | static int __devexit ep93xxfb_remove(struct platform_device *pdev) |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 603 | { |
| 604 | struct fb_info *info = platform_get_drvdata(pdev); |
| 605 | struct ep93xx_fbi *fbi = info->par; |
| 606 | |
| 607 | unregister_framebuffer(info); |
| 608 | clk_disable(fbi->clk); |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 609 | ep93xxfb_dealloc_videomem(info); |
| 610 | fb_dealloc_cmap(&info->cmap); |
| 611 | |
| 612 | if (fbi->mach_info->teardown) |
| 613 | fbi->mach_info->teardown(pdev); |
| 614 | |
| 615 | kfree(info); |
| 616 | platform_set_drvdata(pdev, NULL); |
| 617 | |
| 618 | return 0; |
| 619 | } |
| 620 | |
| 621 | static struct platform_driver ep93xxfb_driver = { |
| 622 | .probe = ep93xxfb_probe, |
Ryan Mallon | c0fdcfa | 2011-01-10 20:49:27 +0100 | [diff] [blame] | 623 | .remove = __devexit_p(ep93xxfb_remove), |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 624 | .driver = { |
| 625 | .name = "ep93xx-fb", |
| 626 | .owner = THIS_MODULE, |
| 627 | }, |
| 628 | }; |
| 629 | |
| 630 | static int __devinit ep93xxfb_init(void) |
| 631 | { |
| 632 | return platform_driver_register(&ep93xxfb_driver); |
| 633 | } |
| 634 | |
| 635 | static void __exit ep93xxfb_exit(void) |
| 636 | { |
| 637 | platform_driver_unregister(&ep93xxfb_driver); |
| 638 | } |
| 639 | |
| 640 | module_init(ep93xxfb_init); |
| 641 | module_exit(ep93xxfb_exit); |
| 642 | |
| 643 | MODULE_DESCRIPTION("EP93XX Framebuffer Driver"); |
| 644 | MODULE_ALIAS("platform:ep93xx-fb"); |
Ryan Mallon | 1c5454e | 2011-06-15 14:45:36 +1000 | [diff] [blame] | 645 | MODULE_AUTHOR("Ryan Mallon, " |
Ryan Mallon | 88017bda | 2009-09-22 16:47:09 -0700 | [diff] [blame] | 646 | "H Hartley Sweeten <hsweeten@visionengravers.com"); |
| 647 | MODULE_LICENSE("GPL"); |