Arnaud Patard | 20fd576 | 2005-09-09 13:10:07 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/video/s3c2410fb.c |
| 3 | * Copyright (c) Arnaud Patard, Ben Dooks |
| 4 | * |
| 5 | * This file is subject to the terms and conditions of the GNU General Public |
| 6 | * License. See the file COPYING in the main directory of this archive for |
| 7 | * more details. |
| 8 | * |
| 9 | * S3C2410 LCD Controller Frame Buffer Driver |
| 10 | * based on skeletonfb.c, sa1100fb.c and others |
| 11 | * |
| 12 | * ChangeLog |
| 13 | * 2005-04-07: Arnaud Patard <arnaud.patard@rtp-net.org> |
| 14 | * - u32 state -> pm_message_t state |
| 15 | * - S3C2410_{VA,SZ}_LCD -> S3C24XX |
| 16 | * |
| 17 | * 2005-03-15: Arnaud Patard <arnaud.patard@rtp-net.org> |
| 18 | * - Removed the ioctl |
| 19 | * - use readl/writel instead of __raw_writel/__raw_readl |
| 20 | * |
| 21 | * 2004-12-04: Arnaud Patard <arnaud.patard@rtp-net.org> |
| 22 | * - Added the possibility to set on or off the |
| 23 | * debugging mesaages |
| 24 | * - Replaced 0 and 1 by on or off when reading the |
| 25 | * /sys files |
| 26 | * |
| 27 | * 2005-03-23: Ben Dooks <ben-linux@fluff.org> |
| 28 | * - added non 16bpp modes |
| 29 | * - updated platform information for range of x/y/bpp |
| 30 | * - add code to ensure palette is written correctly |
| 31 | * - add pixel clock divisor control |
| 32 | * |
| 33 | * 2004-11-11: Arnaud Patard <arnaud.patard@rtp-net.org> |
| 34 | * - Removed the use of currcon as it no more exist |
| 35 | * - Added LCD power sysfs interface |
| 36 | * |
| 37 | * 2004-11-03: Ben Dooks <ben-linux@fluff.org> |
| 38 | * - minor cleanups |
| 39 | * - add suspend/resume support |
| 40 | * - s3c2410fb_setcolreg() not valid in >8bpp modes |
| 41 | * - removed last CONFIG_FB_S3C2410_FIXED |
| 42 | * - ensure lcd controller stopped before cleanup |
| 43 | * - added sysfs interface for backlight power |
| 44 | * - added mask for gpio configuration |
| 45 | * - ensured IRQs disabled during GPIO configuration |
| 46 | * - disable TPAL before enabling video |
| 47 | * |
| 48 | * 2004-09-20: Arnaud Patard <arnaud.patard@rtp-net.org> |
| 49 | * - Suppress command line options |
| 50 | * |
| 51 | * 2004-09-15: Arnaud Patard <arnaud.patard@rtp-net.org> |
| 52 | * - code cleanup |
| 53 | * |
| 54 | * 2004-09-07: Arnaud Patard <arnaud.patard@rtp-net.org> |
| 55 | * - Renamed from h1940fb.c to s3c2410fb.c |
| 56 | * - Add support for different devices |
| 57 | * - Backlight support |
| 58 | * |
| 59 | * 2004-09-05: Herbert Pötzl <herbert@13thfloor.at> |
| 60 | * - added clock (de-)allocation code |
| 61 | * - added fixem fbmem option |
| 62 | * |
| 63 | * 2004-07-27: Arnaud Patard <arnaud.patard@rtp-net.org> |
| 64 | * - code cleanup |
| 65 | * - added a forgotten return in h1940fb_init |
| 66 | * |
| 67 | * 2004-07-19: Herbert Pötzl <herbert@13thfloor.at> |
| 68 | * - code cleanup and extended debugging |
| 69 | * |
| 70 | * 2004-07-15: Arnaud Patard <arnaud.patard@rtp-net.org> |
| 71 | * - First version |
| 72 | */ |
| 73 | |
| 74 | #include <linux/module.h> |
| 75 | #include <linux/kernel.h> |
| 76 | #include <linux/errno.h> |
| 77 | #include <linux/string.h> |
| 78 | #include <linux/mm.h> |
| 79 | #include <linux/tty.h> |
| 80 | #include <linux/slab.h> |
| 81 | #include <linux/delay.h> |
| 82 | #include <linux/fb.h> |
| 83 | #include <linux/init.h> |
| 84 | #include <linux/dma-mapping.h> |
| 85 | #include <linux/string.h> |
| 86 | #include <linux/interrupt.h> |
| 87 | #include <linux/workqueue.h> |
| 88 | #include <linux/wait.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 89 | #include <linux/platform_device.h> |
Arnaud Patard | 20fd576 | 2005-09-09 13:10:07 -0700 | [diff] [blame] | 90 | |
| 91 | #include <asm/io.h> |
| 92 | #include <asm/uaccess.h> |
| 93 | #include <asm/div64.h> |
| 94 | |
| 95 | #include <asm/mach/map.h> |
| 96 | #include <asm/arch/regs-lcd.h> |
| 97 | #include <asm/arch/regs-gpio.h> |
| 98 | #include <asm/arch/fb.h> |
| 99 | #include <asm/hardware/clock.h> |
| 100 | |
| 101 | #ifdef CONFIG_PM |
| 102 | #include <linux/pm.h> |
| 103 | #endif |
| 104 | |
| 105 | #include "s3c2410fb.h" |
| 106 | |
| 107 | |
| 108 | static struct s3c2410fb_mach_info *mach_info; |
| 109 | |
| 110 | /* Debugging stuff */ |
| 111 | #ifdef CONFIG_FB_S3C2410_DEBUG |
| 112 | static int debug = 1; |
| 113 | #else |
| 114 | static int debug = 0; |
| 115 | #endif |
| 116 | |
| 117 | #define dprintk(msg...) if (debug) { printk(KERN_DEBUG "s3c2410fb: " msg); } |
| 118 | |
| 119 | /* useful functions */ |
| 120 | |
| 121 | /* s3c2410fb_set_lcdaddr |
| 122 | * |
| 123 | * initialise lcd controller address pointers |
| 124 | */ |
| 125 | |
| 126 | static void s3c2410fb_set_lcdaddr(struct s3c2410fb_info *fbi) |
| 127 | { |
| 128 | struct fb_var_screeninfo *var = &fbi->fb->var; |
| 129 | unsigned long saddr1, saddr2, saddr3; |
| 130 | |
| 131 | saddr1 = fbi->fb->fix.smem_start >> 1; |
| 132 | saddr2 = fbi->fb->fix.smem_start; |
| 133 | saddr2 += (var->xres * var->yres * var->bits_per_pixel)/8; |
| 134 | saddr2>>= 1; |
| 135 | |
| 136 | saddr3 = S3C2410_OFFSIZE(0) | S3C2410_PAGEWIDTH(var->xres); |
| 137 | |
| 138 | dprintk("LCDSADDR1 = 0x%08lx\n", saddr1); |
| 139 | dprintk("LCDSADDR2 = 0x%08lx\n", saddr2); |
| 140 | dprintk("LCDSADDR3 = 0x%08lx\n", saddr3); |
| 141 | |
| 142 | writel(saddr1, S3C2410_LCDSADDR1); |
| 143 | writel(saddr2, S3C2410_LCDSADDR2); |
| 144 | writel(saddr3, S3C2410_LCDSADDR3); |
| 145 | } |
| 146 | |
| 147 | /* s3c2410fb_calc_pixclk() |
| 148 | * |
| 149 | * calculate divisor for clk->pixclk |
| 150 | */ |
| 151 | |
| 152 | static unsigned int s3c2410fb_calc_pixclk(struct s3c2410fb_info *fbi, |
| 153 | unsigned long pixclk) |
| 154 | { |
| 155 | unsigned long clk = clk_get_rate(fbi->clk); |
| 156 | unsigned long long div; |
| 157 | |
| 158 | /* pixclk is in picoseoncds, our clock is in Hz |
| 159 | * |
| 160 | * Hz -> picoseconds is / 10^-12 |
| 161 | */ |
| 162 | |
| 163 | div = (unsigned long long)clk * pixclk; |
| 164 | do_div(div,1000000UL); |
| 165 | do_div(div,1000000UL); |
| 166 | |
| 167 | dprintk("pixclk %ld, divisor is %ld\n", pixclk, (long)div); |
| 168 | return div; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * s3c2410fb_check_var(): |
| 173 | * Get the video params out of 'var'. If a value doesn't fit, round it up, |
| 174 | * if it's too big, return -EINVAL. |
| 175 | * |
| 176 | */ |
| 177 | static int s3c2410fb_check_var(struct fb_var_screeninfo *var, |
| 178 | struct fb_info *info) |
| 179 | { |
| 180 | struct s3c2410fb_info *fbi = info->par; |
| 181 | |
| 182 | dprintk("check_var(var=%p, info=%p)\n", var, info); |
| 183 | |
| 184 | /* validate x/y resolution */ |
| 185 | |
| 186 | if (var->yres > fbi->mach_info->yres.max) |
| 187 | var->yres = fbi->mach_info->yres.max; |
| 188 | else if (var->yres < fbi->mach_info->yres.min) |
| 189 | var->yres = fbi->mach_info->yres.min; |
| 190 | |
| 191 | if (var->xres > fbi->mach_info->xres.max) |
| 192 | var->yres = fbi->mach_info->xres.max; |
| 193 | else if (var->xres < fbi->mach_info->xres.min) |
| 194 | var->xres = fbi->mach_info->xres.min; |
| 195 | |
| 196 | /* validate bpp */ |
| 197 | |
| 198 | if (var->bits_per_pixel > fbi->mach_info->bpp.max) |
| 199 | var->bits_per_pixel = fbi->mach_info->bpp.max; |
| 200 | else if (var->bits_per_pixel < fbi->mach_info->bpp.min) |
| 201 | var->bits_per_pixel = fbi->mach_info->bpp.min; |
| 202 | |
| 203 | /* set r/g/b positions */ |
| 204 | |
| 205 | if (var->bits_per_pixel == 16) { |
| 206 | var->red.offset = 11; |
| 207 | var->green.offset = 5; |
| 208 | var->blue.offset = 0; |
| 209 | var->red.length = 5; |
| 210 | var->green.length = 6; |
| 211 | var->blue.length = 5; |
| 212 | var->transp.length = 0; |
| 213 | } else { |
| 214 | var->red.length = var->bits_per_pixel; |
| 215 | var->red.offset = 0; |
| 216 | var->green.length = var->bits_per_pixel; |
| 217 | var->green.offset = 0; |
| 218 | var->blue.length = var->bits_per_pixel; |
| 219 | var->blue.offset = 0; |
| 220 | var->transp.length = 0; |
| 221 | } |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | /* s3c2410fb_activate_var |
| 227 | * |
| 228 | * activate (set) the controller from the given framebuffer |
| 229 | * information |
| 230 | */ |
| 231 | |
Ben Dooks | fe984bb | 2005-09-29 05:24:38 +0800 | [diff] [blame] | 232 | static void s3c2410fb_activate_var(struct s3c2410fb_info *fbi, |
| 233 | struct fb_var_screeninfo *var) |
Arnaud Patard | 20fd576 | 2005-09-09 13:10:07 -0700 | [diff] [blame] | 234 | { |
| 235 | fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_MODEMASK; |
| 236 | |
| 237 | dprintk("%s: var->xres = %d\n", __FUNCTION__, var->xres); |
| 238 | dprintk("%s: var->yres = %d\n", __FUNCTION__, var->yres); |
| 239 | dprintk("%s: var->bpp = %d\n", __FUNCTION__, var->bits_per_pixel); |
| 240 | |
| 241 | switch (var->bits_per_pixel) { |
| 242 | case 1: |
| 243 | fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT1BPP; |
| 244 | break; |
| 245 | case 2: |
| 246 | fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT2BPP; |
| 247 | break; |
| 248 | case 4: |
| 249 | fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT4BPP; |
| 250 | break; |
| 251 | case 8: |
| 252 | fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT8BPP; |
| 253 | break; |
| 254 | case 16: |
| 255 | fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT16BPP; |
| 256 | break; |
| 257 | } |
| 258 | |
| 259 | /* check to see if we need to update sync/borders */ |
| 260 | |
| 261 | if (!fbi->mach_info->fixed_syncs) { |
| 262 | dprintk("setting vert: up=%d, low=%d, sync=%d\n", |
| 263 | var->upper_margin, var->lower_margin, |
| 264 | var->vsync_len); |
| 265 | |
| 266 | dprintk("setting horz: lft=%d, rt=%d, sync=%d\n", |
| 267 | var->left_margin, var->right_margin, |
| 268 | var->hsync_len); |
| 269 | |
| 270 | fbi->regs.lcdcon2 = |
| 271 | S3C2410_LCDCON2_VBPD(var->upper_margin - 1) | |
| 272 | S3C2410_LCDCON2_VFPD(var->lower_margin - 1) | |
| 273 | S3C2410_LCDCON2_VSPW(var->vsync_len - 1); |
| 274 | |
| 275 | fbi->regs.lcdcon3 = |
| 276 | S3C2410_LCDCON3_HBPD(var->right_margin - 1) | |
| 277 | S3C2410_LCDCON3_HFPD(var->left_margin - 1); |
| 278 | |
| 279 | fbi->regs.lcdcon4 &= ~S3C2410_LCDCON4_HSPW(0xff); |
| 280 | fbi->regs.lcdcon4 |= S3C2410_LCDCON4_HSPW(var->hsync_len - 1); |
| 281 | } |
| 282 | |
| 283 | /* update X/Y info */ |
| 284 | |
| 285 | fbi->regs.lcdcon2 &= ~S3C2410_LCDCON2_LINEVAL(0x3ff); |
| 286 | fbi->regs.lcdcon2 |= S3C2410_LCDCON2_LINEVAL(var->yres - 1); |
| 287 | |
| 288 | fbi->regs.lcdcon3 &= ~S3C2410_LCDCON3_HOZVAL(0x7ff); |
| 289 | fbi->regs.lcdcon3 |= S3C2410_LCDCON3_HOZVAL(var->xres - 1); |
| 290 | |
| 291 | if (var->pixclock > 0) { |
| 292 | int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock); |
| 293 | |
| 294 | clkdiv = (clkdiv / 2) -1; |
| 295 | if (clkdiv < 0) |
| 296 | clkdiv = 0; |
| 297 | |
| 298 | fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_CLKVAL(0x3ff); |
| 299 | fbi->regs.lcdcon1 |= S3C2410_LCDCON1_CLKVAL(clkdiv); |
| 300 | } |
| 301 | |
| 302 | /* write new registers */ |
| 303 | |
| 304 | dprintk("new register set:\n"); |
| 305 | dprintk("lcdcon[1] = 0x%08lx\n", fbi->regs.lcdcon1); |
| 306 | dprintk("lcdcon[2] = 0x%08lx\n", fbi->regs.lcdcon2); |
| 307 | dprintk("lcdcon[3] = 0x%08lx\n", fbi->regs.lcdcon3); |
| 308 | dprintk("lcdcon[4] = 0x%08lx\n", fbi->regs.lcdcon4); |
| 309 | dprintk("lcdcon[5] = 0x%08lx\n", fbi->regs.lcdcon5); |
| 310 | |
| 311 | writel(fbi->regs.lcdcon1 & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1); |
| 312 | writel(fbi->regs.lcdcon2, S3C2410_LCDCON2); |
| 313 | writel(fbi->regs.lcdcon3, S3C2410_LCDCON3); |
| 314 | writel(fbi->regs.lcdcon4, S3C2410_LCDCON4); |
| 315 | writel(fbi->regs.lcdcon5, S3C2410_LCDCON5); |
| 316 | |
| 317 | /* set lcd address pointers */ |
| 318 | s3c2410fb_set_lcdaddr(fbi); |
| 319 | |
| 320 | writel(fbi->regs.lcdcon1, S3C2410_LCDCON1); |
| 321 | } |
| 322 | |
| 323 | |
| 324 | /* |
| 325 | * s3c2410fb_set_par - Optional function. Alters the hardware state. |
| 326 | * @info: frame buffer structure that represents a single frame buffer |
| 327 | * |
| 328 | */ |
| 329 | static int s3c2410fb_set_par(struct fb_info *info) |
| 330 | { |
| 331 | struct s3c2410fb_info *fbi = info->par; |
| 332 | struct fb_var_screeninfo *var = &info->var; |
| 333 | |
| 334 | if (var->bits_per_pixel == 16) |
| 335 | fbi->fb->fix.visual = FB_VISUAL_TRUECOLOR; |
| 336 | else |
| 337 | fbi->fb->fix.visual = FB_VISUAL_PSEUDOCOLOR; |
| 338 | |
| 339 | fbi->fb->fix.line_length = (var->width*var->bits_per_pixel)/8; |
| 340 | |
| 341 | /* activate this new configuration */ |
| 342 | |
| 343 | s3c2410fb_activate_var(fbi, var); |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | static void schedule_palette_update(struct s3c2410fb_info *fbi, |
| 348 | unsigned int regno, unsigned int val) |
| 349 | { |
| 350 | unsigned long flags; |
| 351 | unsigned long irqen; |
| 352 | |
| 353 | local_irq_save(flags); |
| 354 | |
| 355 | fbi->palette_buffer[regno] = val; |
| 356 | |
| 357 | if (!fbi->palette_ready) { |
| 358 | fbi->palette_ready = 1; |
| 359 | |
| 360 | /* enable IRQ */ |
| 361 | irqen = readl(S3C2410_LCDINTMSK); |
| 362 | irqen &= ~S3C2410_LCDINT_FRSYNC; |
| 363 | writel(irqen, S3C2410_LCDINTMSK); |
| 364 | } |
| 365 | |
| 366 | local_irq_restore(flags); |
| 367 | } |
| 368 | |
| 369 | /* from pxafb.c */ |
| 370 | static inline unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf) |
| 371 | { |
| 372 | chan &= 0xffff; |
| 373 | chan >>= 16 - bf->length; |
| 374 | return chan << bf->offset; |
| 375 | } |
| 376 | |
| 377 | static int s3c2410fb_setcolreg(unsigned regno, |
| 378 | unsigned red, unsigned green, unsigned blue, |
| 379 | unsigned transp, struct fb_info *info) |
| 380 | { |
| 381 | struct s3c2410fb_info *fbi = info->par; |
| 382 | unsigned int val; |
| 383 | |
| 384 | /* dprintk("setcol: regno=%d, rgb=%d,%d,%d\n", regno, red, green, blue); */ |
| 385 | |
| 386 | switch (fbi->fb->fix.visual) { |
| 387 | case FB_VISUAL_TRUECOLOR: |
| 388 | /* true-colour, use pseuo-palette */ |
| 389 | |
| 390 | if (regno < 16) { |
| 391 | u32 *pal = fbi->fb->pseudo_palette; |
| 392 | |
| 393 | val = chan_to_field(red, &fbi->fb->var.red); |
| 394 | val |= chan_to_field(green, &fbi->fb->var.green); |
| 395 | val |= chan_to_field(blue, &fbi->fb->var.blue); |
| 396 | |
| 397 | pal[regno] = val; |
| 398 | } |
| 399 | break; |
| 400 | |
| 401 | case FB_VISUAL_PSEUDOCOLOR: |
| 402 | if (regno < 256) { |
| 403 | /* currently assume RGB 5-6-5 mode */ |
| 404 | |
| 405 | val = ((red >> 0) & 0xf800); |
| 406 | val |= ((green >> 5) & 0x07e0); |
| 407 | val |= ((blue >> 11) & 0x001f); |
| 408 | |
| 409 | writel(val, S3C2410_TFTPAL(regno)); |
| 410 | schedule_palette_update(fbi, regno, val); |
| 411 | } |
| 412 | |
| 413 | break; |
| 414 | |
| 415 | default: |
| 416 | return 1; /* unknown type */ |
| 417 | } |
| 418 | |
| 419 | return 0; |
| 420 | } |
| 421 | |
| 422 | |
| 423 | /** |
| 424 | * s3c2410fb_blank |
| 425 | * @blank_mode: the blank mode we want. |
| 426 | * @info: frame buffer structure that represents a single frame buffer |
| 427 | * |
| 428 | * Blank the screen if blank_mode != 0, else unblank. Return 0 if |
| 429 | * blanking succeeded, != 0 if un-/blanking failed due to e.g. a |
| 430 | * video mode which doesn't support it. Implements VESA suspend |
| 431 | * and powerdown modes on hardware that supports disabling hsync/vsync: |
| 432 | * blank_mode == 2: suspend vsync |
| 433 | * blank_mode == 3: suspend hsync |
| 434 | * blank_mode == 4: powerdown |
| 435 | * |
| 436 | * Returns negative errno on error, or zero on success. |
| 437 | * |
| 438 | */ |
| 439 | static int s3c2410fb_blank(int blank_mode, struct fb_info *info) |
| 440 | { |
| 441 | dprintk("blank(mode=%d, info=%p)\n", blank_mode, info); |
| 442 | |
| 443 | if (mach_info == NULL) |
| 444 | return -EINVAL; |
| 445 | |
| 446 | if (blank_mode == FB_BLANK_UNBLANK) |
| 447 | writel(0x0, S3C2410_TPAL); |
| 448 | else { |
| 449 | dprintk("setting TPAL to output 0x000000\n"); |
| 450 | writel(S3C2410_TPAL_EN, S3C2410_TPAL); |
| 451 | } |
| 452 | |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | static int s3c2410fb_debug_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 457 | { |
| 458 | return snprintf(buf, PAGE_SIZE, "%s\n", debug ? "on" : "off"); |
| 459 | } |
| 460 | static int s3c2410fb_debug_store(struct device *dev, struct device_attribute *attr, |
| 461 | const char *buf, size_t len) |
| 462 | { |
| 463 | if (mach_info == NULL) |
| 464 | return -EINVAL; |
| 465 | |
| 466 | if (len < 1) |
| 467 | return -EINVAL; |
| 468 | |
| 469 | if (strnicmp(buf, "on", 2) == 0 || |
| 470 | strnicmp(buf, "1", 1) == 0) { |
| 471 | debug = 1; |
| 472 | printk(KERN_DEBUG "s3c2410fb: Debug On"); |
| 473 | } else if (strnicmp(buf, "off", 3) == 0 || |
| 474 | strnicmp(buf, "0", 1) == 0) { |
| 475 | debug = 0; |
| 476 | printk(KERN_DEBUG "s3c2410fb: Debug Off"); |
| 477 | } else { |
| 478 | return -EINVAL; |
| 479 | } |
| 480 | |
| 481 | return len; |
| 482 | } |
| 483 | |
| 484 | |
| 485 | static DEVICE_ATTR(debug, 0666, |
| 486 | s3c2410fb_debug_show, |
| 487 | s3c2410fb_debug_store); |
| 488 | |
| 489 | static struct fb_ops s3c2410fb_ops = { |
| 490 | .owner = THIS_MODULE, |
| 491 | .fb_check_var = s3c2410fb_check_var, |
| 492 | .fb_set_par = s3c2410fb_set_par, |
| 493 | .fb_blank = s3c2410fb_blank, |
| 494 | .fb_setcolreg = s3c2410fb_setcolreg, |
| 495 | .fb_fillrect = cfb_fillrect, |
| 496 | .fb_copyarea = cfb_copyarea, |
| 497 | .fb_imageblit = cfb_imageblit, |
| 498 | .fb_cursor = soft_cursor, |
| 499 | }; |
| 500 | |
| 501 | |
| 502 | /* |
| 503 | * s3c2410fb_map_video_memory(): |
| 504 | * Allocates the DRAM memory for the frame buffer. This buffer is |
| 505 | * remapped into a non-cached, non-buffered, memory region to |
| 506 | * allow palette and pixel writes to occur without flushing the |
| 507 | * cache. Once this area is remapped, all virtual memory |
| 508 | * access to the video memory should occur at the new region. |
| 509 | */ |
| 510 | static int __init s3c2410fb_map_video_memory(struct s3c2410fb_info *fbi) |
| 511 | { |
| 512 | dprintk("map_video_memory(fbi=%p)\n", fbi); |
| 513 | |
| 514 | fbi->map_size = PAGE_ALIGN(fbi->fb->fix.smem_len + PAGE_SIZE); |
| 515 | fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size, |
| 516 | &fbi->map_dma, GFP_KERNEL); |
| 517 | |
| 518 | fbi->map_size = fbi->fb->fix.smem_len; |
| 519 | |
| 520 | if (fbi->map_cpu) { |
| 521 | /* prevent initial garbage on screen */ |
| 522 | dprintk("map_video_memory: clear %p:%08x\n", |
| 523 | fbi->map_cpu, fbi->map_size); |
| 524 | memset(fbi->map_cpu, 0xf0, fbi->map_size); |
| 525 | |
| 526 | fbi->screen_dma = fbi->map_dma; |
| 527 | fbi->fb->screen_base = fbi->map_cpu; |
| 528 | fbi->fb->fix.smem_start = fbi->screen_dma; |
| 529 | |
| 530 | dprintk("map_video_memory: dma=%08x cpu=%p size=%08x\n", |
| 531 | fbi->map_dma, fbi->map_cpu, fbi->fb->fix.smem_len); |
| 532 | } |
| 533 | |
| 534 | return fbi->map_cpu ? 0 : -ENOMEM; |
| 535 | } |
| 536 | |
| 537 | static inline void s3c2410fb_unmap_video_memory(struct s3c2410fb_info *fbi) |
| 538 | { |
| 539 | dma_free_writecombine(fbi->dev,fbi->map_size,fbi->map_cpu, fbi->map_dma); |
| 540 | } |
| 541 | |
| 542 | static inline void modify_gpio(void __iomem *reg, |
| 543 | unsigned long set, unsigned long mask) |
| 544 | { |
| 545 | unsigned long tmp; |
| 546 | |
| 547 | tmp = readl(reg) & ~mask; |
| 548 | writel(tmp | set, reg); |
| 549 | } |
| 550 | |
| 551 | |
| 552 | /* |
| 553 | * s3c2410fb_init_registers - Initialise all LCD-related registers |
| 554 | */ |
| 555 | |
| 556 | int s3c2410fb_init_registers(struct s3c2410fb_info *fbi) |
| 557 | { |
| 558 | unsigned long flags; |
| 559 | |
| 560 | /* Initialise LCD with values from haret */ |
| 561 | |
| 562 | local_irq_save(flags); |
| 563 | |
| 564 | /* modify the gpio(s) with interrupts set (bjd) */ |
| 565 | |
| 566 | modify_gpio(S3C2410_GPCUP, mach_info->gpcup, mach_info->gpcup_mask); |
| 567 | modify_gpio(S3C2410_GPCCON, mach_info->gpccon, mach_info->gpccon_mask); |
| 568 | modify_gpio(S3C2410_GPDUP, mach_info->gpdup, mach_info->gpdup_mask); |
| 569 | modify_gpio(S3C2410_GPDCON, mach_info->gpdcon, mach_info->gpdcon_mask); |
| 570 | |
| 571 | local_irq_restore(flags); |
| 572 | |
| 573 | writel(fbi->regs.lcdcon1, S3C2410_LCDCON1); |
| 574 | writel(fbi->regs.lcdcon2, S3C2410_LCDCON2); |
| 575 | writel(fbi->regs.lcdcon3, S3C2410_LCDCON3); |
| 576 | writel(fbi->regs.lcdcon4, S3C2410_LCDCON4); |
| 577 | writel(fbi->regs.lcdcon5, S3C2410_LCDCON5); |
| 578 | |
| 579 | s3c2410fb_set_lcdaddr(fbi); |
| 580 | |
| 581 | dprintk("LPCSEL = 0x%08lx\n", mach_info->lpcsel); |
| 582 | writel(mach_info->lpcsel, S3C2410_LPCSEL); |
| 583 | |
| 584 | dprintk("replacing TPAL %08x\n", readl(S3C2410_TPAL)); |
| 585 | |
| 586 | /* ensure temporary palette disabled */ |
| 587 | writel(0x00, S3C2410_TPAL); |
| 588 | |
| 589 | /* Enable video by setting the ENVID bit to 1 */ |
| 590 | fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID; |
| 591 | writel(fbi->regs.lcdcon1, S3C2410_LCDCON1); |
| 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | static void s3c2410fb_write_palette(struct s3c2410fb_info *fbi) |
| 596 | { |
| 597 | unsigned int i; |
| 598 | unsigned long ent; |
| 599 | |
| 600 | fbi->palette_ready = 0; |
| 601 | |
| 602 | for (i = 0; i < 256; i++) { |
| 603 | if ((ent = fbi->palette_buffer[i]) == PALETTE_BUFF_CLEAR) |
| 604 | continue; |
| 605 | |
| 606 | writel(ent, S3C2410_TFTPAL(i)); |
| 607 | |
| 608 | /* it seems the only way to know exactly |
| 609 | * if the palette wrote ok, is to check |
| 610 | * to see if the value verifies ok |
| 611 | */ |
| 612 | |
| 613 | if (readw(S3C2410_TFTPAL(i)) == ent) |
| 614 | fbi->palette_buffer[i] = PALETTE_BUFF_CLEAR; |
| 615 | else |
| 616 | fbi->palette_ready = 1; /* retry */ |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | static irqreturn_t s3c2410fb_irq(int irq, void *dev_id, struct pt_regs *r) |
| 621 | { |
| 622 | struct s3c2410fb_info *fbi = dev_id; |
| 623 | unsigned long lcdirq = readl(S3C2410_LCDINTPND); |
| 624 | |
| 625 | if (lcdirq & S3C2410_LCDINT_FRSYNC) { |
| 626 | if (fbi->palette_ready) |
| 627 | s3c2410fb_write_palette(fbi); |
| 628 | |
| 629 | writel(S3C2410_LCDINT_FRSYNC, S3C2410_LCDINTPND); |
| 630 | writel(S3C2410_LCDINT_FRSYNC, S3C2410_LCDSRCPND); |
| 631 | } |
| 632 | |
| 633 | return IRQ_HANDLED; |
| 634 | } |
| 635 | |
| 636 | static char driver_name[]="s3c2410fb"; |
| 637 | |
| 638 | int __init s3c2410fb_probe(struct device *dev) |
| 639 | { |
| 640 | struct s3c2410fb_info *info; |
| 641 | struct fb_info *fbinfo; |
| 642 | struct platform_device *pdev = to_platform_device(dev); |
| 643 | struct s3c2410fb_hw *mregs; |
| 644 | int ret; |
| 645 | int irq; |
| 646 | int i; |
| 647 | |
| 648 | mach_info = dev->platform_data; |
| 649 | if (mach_info == NULL) { |
| 650 | dev_err(dev,"no platform data for lcd, cannot attach\n"); |
| 651 | return -EINVAL; |
| 652 | } |
| 653 | |
| 654 | mregs = &mach_info->regs; |
| 655 | |
| 656 | irq = platform_get_irq(pdev, 0); |
| 657 | if (irq < 0) { |
| 658 | dev_err(dev, "no irq for device\n"); |
| 659 | return -ENOENT; |
| 660 | } |
| 661 | |
| 662 | fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), dev); |
| 663 | if (!fbinfo) { |
| 664 | return -ENOMEM; |
| 665 | } |
| 666 | |
| 667 | |
| 668 | info = fbinfo->par; |
| 669 | info->fb = fbinfo; |
| 670 | dev_set_drvdata(dev, fbinfo); |
| 671 | |
| 672 | s3c2410fb_init_registers(info); |
| 673 | |
| 674 | dprintk("devinit\n"); |
| 675 | |
| 676 | strcpy(fbinfo->fix.id, driver_name); |
| 677 | |
| 678 | memcpy(&info->regs, &mach_info->regs, sizeof(info->regs)); |
| 679 | |
| 680 | info->mach_info = dev->platform_data; |
| 681 | |
| 682 | fbinfo->fix.type = FB_TYPE_PACKED_PIXELS; |
| 683 | fbinfo->fix.type_aux = 0; |
| 684 | fbinfo->fix.xpanstep = 0; |
| 685 | fbinfo->fix.ypanstep = 0; |
| 686 | fbinfo->fix.ywrapstep = 0; |
| 687 | fbinfo->fix.accel = FB_ACCEL_NONE; |
| 688 | |
| 689 | fbinfo->var.nonstd = 0; |
| 690 | fbinfo->var.activate = FB_ACTIVATE_NOW; |
| 691 | fbinfo->var.height = mach_info->height; |
| 692 | fbinfo->var.width = mach_info->width; |
| 693 | fbinfo->var.accel_flags = 0; |
| 694 | fbinfo->var.vmode = FB_VMODE_NONINTERLACED; |
| 695 | |
| 696 | fbinfo->fbops = &s3c2410fb_ops; |
| 697 | fbinfo->flags = FBINFO_FLAG_DEFAULT; |
| 698 | fbinfo->pseudo_palette = &info->pseudo_pal; |
| 699 | |
| 700 | fbinfo->var.xres = mach_info->xres.defval; |
| 701 | fbinfo->var.xres_virtual = mach_info->xres.defval; |
| 702 | fbinfo->var.yres = mach_info->yres.defval; |
| 703 | fbinfo->var.yres_virtual = mach_info->yres.defval; |
| 704 | fbinfo->var.bits_per_pixel = mach_info->bpp.defval; |
| 705 | |
| 706 | fbinfo->var.upper_margin = S3C2410_LCDCON2_GET_VBPD(mregs->lcdcon2) +1; |
| 707 | fbinfo->var.lower_margin = S3C2410_LCDCON2_GET_VFPD(mregs->lcdcon2) +1; |
| 708 | fbinfo->var.vsync_len = S3C2410_LCDCON2_GET_VSPW(mregs->lcdcon2) + 1; |
| 709 | |
| 710 | fbinfo->var.left_margin = S3C2410_LCDCON3_GET_HFPD(mregs->lcdcon3) + 1; |
| 711 | fbinfo->var.right_margin = S3C2410_LCDCON3_GET_HBPD(mregs->lcdcon3) + 1; |
| 712 | fbinfo->var.hsync_len = S3C2410_LCDCON4_GET_HSPW(mregs->lcdcon4) + 1; |
| 713 | |
| 714 | fbinfo->var.red.offset = 11; |
| 715 | fbinfo->var.green.offset = 5; |
| 716 | fbinfo->var.blue.offset = 0; |
| 717 | fbinfo->var.transp.offset = 0; |
| 718 | fbinfo->var.red.length = 5; |
| 719 | fbinfo->var.green.length = 6; |
| 720 | fbinfo->var.blue.length = 5; |
| 721 | fbinfo->var.transp.length = 0; |
| 722 | fbinfo->fix.smem_len = mach_info->xres.max * |
| 723 | mach_info->yres.max * |
| 724 | mach_info->bpp.max / 8; |
| 725 | |
| 726 | for (i = 0; i < 256; i++) |
| 727 | info->palette_buffer[i] = PALETTE_BUFF_CLEAR; |
| 728 | |
| 729 | if (!request_mem_region((unsigned long)S3C24XX_VA_LCD, SZ_1M, "s3c2410-lcd")) { |
| 730 | ret = -EBUSY; |
| 731 | goto dealloc_fb; |
| 732 | } |
| 733 | |
| 734 | |
| 735 | dprintk("got LCD region\n"); |
| 736 | |
| 737 | ret = request_irq(irq, s3c2410fb_irq, SA_INTERRUPT, pdev->name, info); |
| 738 | if (ret) { |
| 739 | dev_err(dev, "cannot get irq %d - err %d\n", irq, ret); |
| 740 | ret = -EBUSY; |
| 741 | goto release_mem; |
| 742 | } |
| 743 | |
| 744 | info->clk = clk_get(NULL, "lcd"); |
| 745 | if (!info->clk || IS_ERR(info->clk)) { |
| 746 | printk(KERN_ERR "failed to get lcd clock source\n"); |
| 747 | ret = -ENOENT; |
| 748 | goto release_irq; |
| 749 | } |
| 750 | |
| 751 | clk_use(info->clk); |
| 752 | clk_enable(info->clk); |
| 753 | dprintk("got and enabled clock\n"); |
| 754 | |
| 755 | msleep(1); |
| 756 | |
| 757 | /* Initialize video memory */ |
| 758 | ret = s3c2410fb_map_video_memory(info); |
| 759 | if (ret) { |
| 760 | printk( KERN_ERR "Failed to allocate video RAM: %d\n", ret); |
| 761 | ret = -ENOMEM; |
| 762 | goto release_clock; |
| 763 | } |
| 764 | dprintk("got video memory\n"); |
| 765 | |
| 766 | ret = s3c2410fb_init_registers(info); |
| 767 | |
| 768 | ret = s3c2410fb_check_var(&fbinfo->var, fbinfo); |
| 769 | |
| 770 | ret = register_framebuffer(fbinfo); |
| 771 | if (ret < 0) { |
| 772 | printk(KERN_ERR "Failed to register framebuffer device: %d\n", ret); |
| 773 | goto free_video_memory; |
| 774 | } |
| 775 | |
| 776 | /* create device files */ |
| 777 | device_create_file(dev, &dev_attr_debug); |
| 778 | |
| 779 | printk(KERN_INFO "fb%d: %s frame buffer device\n", |
| 780 | fbinfo->node, fbinfo->fix.id); |
| 781 | |
| 782 | return 0; |
| 783 | |
| 784 | free_video_memory: |
| 785 | s3c2410fb_unmap_video_memory(info); |
| 786 | release_clock: |
| 787 | clk_disable(info->clk); |
| 788 | clk_unuse(info->clk); |
| 789 | clk_put(info->clk); |
| 790 | release_irq: |
| 791 | free_irq(irq,info); |
| 792 | release_mem: |
| 793 | release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD); |
| 794 | dealloc_fb: |
| 795 | framebuffer_release(fbinfo); |
| 796 | return ret; |
| 797 | } |
| 798 | |
| 799 | /* s3c2410fb_stop_lcd |
| 800 | * |
| 801 | * shutdown the lcd controller |
| 802 | */ |
| 803 | |
| 804 | static void s3c2410fb_stop_lcd(void) |
| 805 | { |
| 806 | unsigned long flags; |
| 807 | unsigned long tmp; |
| 808 | |
| 809 | local_irq_save(flags); |
| 810 | |
| 811 | tmp = readl(S3C2410_LCDCON1); |
| 812 | writel(tmp & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1); |
| 813 | |
| 814 | local_irq_restore(flags); |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * Cleanup |
| 819 | */ |
| 820 | static int s3c2410fb_remove(struct device *dev) |
| 821 | { |
| 822 | struct platform_device *pdev = to_platform_device(dev); |
| 823 | struct fb_info *fbinfo = dev_get_drvdata(dev); |
| 824 | struct s3c2410fb_info *info = fbinfo->par; |
| 825 | int irq; |
| 826 | |
| 827 | s3c2410fb_stop_lcd(); |
| 828 | msleep(1); |
| 829 | |
| 830 | s3c2410fb_unmap_video_memory(info); |
| 831 | |
| 832 | if (info->clk) { |
| 833 | clk_disable(info->clk); |
| 834 | clk_unuse(info->clk); |
| 835 | clk_put(info->clk); |
| 836 | info->clk = NULL; |
| 837 | } |
| 838 | |
| 839 | irq = platform_get_irq(pdev, 0); |
| 840 | free_irq(irq,info); |
| 841 | release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD); |
| 842 | unregister_framebuffer(fbinfo); |
| 843 | |
| 844 | return 0; |
| 845 | } |
| 846 | |
| 847 | #ifdef CONFIG_PM |
| 848 | |
| 849 | /* suspend and resume support for the lcd controller */ |
| 850 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 851 | static int s3c2410fb_suspend(struct device *dev, pm_message_t state) |
Arnaud Patard | 20fd576 | 2005-09-09 13:10:07 -0700 | [diff] [blame] | 852 | { |
| 853 | struct fb_info *fbinfo = dev_get_drvdata(dev); |
| 854 | struct s3c2410fb_info *info = fbinfo->par; |
| 855 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 856 | s3c2410fb_stop_lcd(); |
Arnaud Patard | 20fd576 | 2005-09-09 13:10:07 -0700 | [diff] [blame] | 857 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 858 | /* sleep before disabling the clock, we need to ensure |
| 859 | * the LCD DMA engine is not going to get back on the bus |
| 860 | * before the clock goes off again (bjd) */ |
Arnaud Patard | 20fd576 | 2005-09-09 13:10:07 -0700 | [diff] [blame] | 861 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 862 | msleep(1); |
| 863 | clk_disable(info->clk); |
Arnaud Patard | 20fd576 | 2005-09-09 13:10:07 -0700 | [diff] [blame] | 864 | |
| 865 | return 0; |
| 866 | } |
| 867 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 868 | static int s3c2410fb_resume(struct device *dev) |
Arnaud Patard | 20fd576 | 2005-09-09 13:10:07 -0700 | [diff] [blame] | 869 | { |
| 870 | struct fb_info *fbinfo = dev_get_drvdata(dev); |
| 871 | struct s3c2410fb_info *info = fbinfo->par; |
| 872 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 873 | clk_enable(info->clk); |
| 874 | msleep(1); |
Arnaud Patard | 20fd576 | 2005-09-09 13:10:07 -0700 | [diff] [blame] | 875 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 876 | s3c2410fb_init_registers(info); |
Arnaud Patard | 20fd576 | 2005-09-09 13:10:07 -0700 | [diff] [blame] | 877 | |
| 878 | return 0; |
| 879 | } |
| 880 | |
| 881 | #else |
| 882 | #define s3c2410fb_suspend NULL |
| 883 | #define s3c2410fb_resume NULL |
| 884 | #endif |
| 885 | |
| 886 | static struct device_driver s3c2410fb_driver = { |
| 887 | .name = "s3c2410-lcd", |
| 888 | .bus = &platform_bus_type, |
| 889 | .probe = s3c2410fb_probe, |
| 890 | .suspend = s3c2410fb_suspend, |
| 891 | .resume = s3c2410fb_resume, |
| 892 | .remove = s3c2410fb_remove |
| 893 | }; |
| 894 | |
| 895 | int __devinit s3c2410fb_init(void) |
| 896 | { |
| 897 | return driver_register(&s3c2410fb_driver); |
| 898 | } |
| 899 | |
| 900 | static void __exit s3c2410fb_cleanup(void) |
| 901 | { |
| 902 | driver_unregister(&s3c2410fb_driver); |
| 903 | } |
| 904 | |
| 905 | |
| 906 | module_init(s3c2410fb_init); |
| 907 | module_exit(s3c2410fb_cleanup); |
| 908 | |
| 909 | MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, Ben Dooks <ben-linux@fluff.org>"); |
| 910 | MODULE_DESCRIPTION("Framebuffer driver for the s3c2410"); |
| 911 | MODULE_LICENSE("GPL"); |