1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * linux/drivers/video/ep93xx-fb.c 4 * 5 * Framebuffer support for the EP93xx series. 6 * 7 * Copyright (C) 2007 Bluewater Systems Ltd 8 * Author: Ryan Mallon 9 * 10 * Copyright (c) 2009 H Hartley Sweeten <hsweeten@visionengravers.com> 11 * 12 * Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb 13 * drivers. 14 */ 15 16#include <linux/platform_device.h> 17#include <linux/module.h> 18#include <linux/dma-mapping.h> 19#include <linux/slab.h> 20#include <linux/clk.h> 21#include <linux/fb.h> 22#include <linux/io.h> 23 24#include <linux/platform_data/video-ep93xx.h> 25 26/* Vertical Frame Timing Registers */ 27#define EP93XXFB_VLINES_TOTAL 0x0000 /* SW locked */ 28#define EP93XXFB_VSYNC 0x0004 /* SW locked */ 29#define EP93XXFB_VACTIVE 0x0008 /* SW locked */ 30#define EP93XXFB_VBLANK 0x0228 /* SW locked */ 31#define EP93XXFB_VCLK 0x000c /* SW locked */ 32 33/* Horizontal Frame Timing Registers */ 34#define EP93XXFB_HCLKS_TOTAL 0x0010 /* SW locked */ 35#define EP93XXFB_HSYNC 0x0014 /* SW locked */ 36#define EP93XXFB_HACTIVE 0x0018 /* SW locked */ 37#define EP93XXFB_HBLANK 0x022c /* SW locked */ 38#define EP93XXFB_HCLK 0x001c /* SW locked */ 39 40/* Frame Buffer Memory Configuration Registers */ 41#define EP93XXFB_SCREEN_PAGE 0x0028 42#define EP93XXFB_SCREEN_HPAGE 0x002c 43#define EP93XXFB_SCREEN_LINES 0x0030 44#define EP93XXFB_LINE_LENGTH 0x0034 45#define EP93XXFB_VLINE_STEP 0x0038 46#define EP93XXFB_LINE_CARRY 0x003c /* SW locked */ 47#define EP93XXFB_EOL_OFFSET 0x0230 48 49/* Other Video Registers */ 50#define EP93XXFB_BRIGHTNESS 0x0020 51#define EP93XXFB_ATTRIBS 0x0024 /* SW locked */ 52#define EP93XXFB_SWLOCK 0x007c /* SW locked */ 53#define EP93XXFB_AC_RATE 0x0214 54#define EP93XXFB_FIFO_LEVEL 0x0234 55#define EP93XXFB_PIXELMODE 0x0054 56#define EP93XXFB_PIXELMODE_32BPP (0x7 << 0) 57#define EP93XXFB_PIXELMODE_24BPP (0x6 << 0) 58#define EP93XXFB_PIXELMODE_16BPP (0x4 << 0) 59#define EP93XXFB_PIXELMODE_8BPP (0x2 << 0) 60#define EP93XXFB_PIXELMODE_SHIFT_1P_24B (0x0 << 3) 61#define EP93XXFB_PIXELMODE_SHIFT_1P_18B (0x1 << 3) 62#define EP93XXFB_PIXELMODE_COLOR_LUT (0x0 << 10) 63#define EP93XXFB_PIXELMODE_COLOR_888 (0x4 << 10) 64#define EP93XXFB_PIXELMODE_COLOR_555 (0x5 << 10) 65#define EP93XXFB_PARL_IF_OUT 0x0058 66#define EP93XXFB_PARL_IF_IN 0x005c 67 68/* Blink Control Registers */ 69#define EP93XXFB_BLINK_RATE 0x0040 70#define EP93XXFB_BLINK_MASK 0x0044 71#define EP93XXFB_BLINK_PATTRN 0x0048 72#define EP93XXFB_PATTRN_MASK 0x004c 73#define EP93XXFB_BKGRND_OFFSET 0x0050 74 75/* Hardware Cursor Registers */ 76#define EP93XXFB_CURSOR_ADR_START 0x0060 77#define EP93XXFB_CURSOR_ADR_RESET 0x0064 78#define EP93XXFB_CURSOR_SIZE 0x0068 79#define EP93XXFB_CURSOR_COLOR1 0x006c 80#define EP93XXFB_CURSOR_COLOR2 0x0070 81#define EP93XXFB_CURSOR_BLINK_COLOR1 0x021c 82#define EP93XXFB_CURSOR_BLINK_COLOR2 0x0220 83#define EP93XXFB_CURSOR_XY_LOC 0x0074 84#define EP93XXFB_CURSOR_DSCAN_HY_LOC 0x0078 85#define EP93XXFB_CURSOR_BLINK_RATE_CTRL 0x0224 86 87/* LUT Registers */ 88#define EP93XXFB_GRY_SCL_LUTR 0x0080 89#define EP93XXFB_GRY_SCL_LUTG 0x0280 90#define EP93XXFB_GRY_SCL_LUTB 0x0300 91#define EP93XXFB_LUT_SW_CONTROL 0x0218 92#define EP93XXFB_LUT_SW_CONTROL_SWTCH (1 << 0) 93#define EP93XXFB_LUT_SW_CONTROL_SSTAT (1 << 1) 94#define EP93XXFB_COLOR_LUT 0x0400 95 96/* Video Signature Registers */ 97#define EP93XXFB_VID_SIG_RSLT_VAL 0x0200 98#define EP93XXFB_VID_SIG_CTRL 0x0204 99#define EP93XXFB_VSIG 0x0208 100#define EP93XXFB_HSIG 0x020c 101#define EP93XXFB_SIG_CLR_STR 0x0210 102 103/* Minimum / Maximum resolutions supported */ 104#define EP93XXFB_MIN_XRES 64 105#define EP93XXFB_MIN_YRES 64 106#define EP93XXFB_MAX_XRES 1024 107#define EP93XXFB_MAX_YRES 768 108 109struct ep93xx_fbi { 110 struct ep93xxfb_mach_info *mach_info; 111 struct clk *clk; 112 struct resource *res; 113 void __iomem *mmio_base; 114 unsigned int pseudo_palette[256]; 115}; 116 117static int check_screenpage_bug = 1; 118module_param(check_screenpage_bug, int, 0644); 119MODULE_PARM_DESC(check_screenpage_bug, 120 "Check for bit 27 screen page bug. Default = 1"); 121 122static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi, 123 unsigned int off) 124{ 125 return __raw_readl(fbi->mmio_base + off); 126} 127 128static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi, 129 unsigned int val, unsigned int off) 130{ 131 __raw_writel(val, fbi->mmio_base + off); 132} 133 134/* 135 * Write to one of the locked raster registers. 136 */ 137static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi, 138 unsigned int val, unsigned int reg) 139{ 140 /* 141 * We don't need a lock or delay here since the raster register 142 * block will remain unlocked until the next access. 143 */ 144 ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK); 145 ep93xxfb_writel(fbi, val, reg); 146} 147 148static void ep93xxfb_set_video_attribs(struct fb_info *info) 149{ 150 struct ep93xx_fbi *fbi = info->par; 151 unsigned int attribs; 152 153 attribs = EP93XXFB_ENABLE; 154 attribs |= fbi->mach_info->flags; 155 ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS); 156} 157 158static int ep93xxfb_set_pixelmode(struct fb_info *info) 159{ 160 struct ep93xx_fbi *fbi = info->par; 161 unsigned int val; 162 163 info->var.transp.offset = 0; 164 info->var.transp.length = 0; 165 166 switch (info->var.bits_per_pixel) { 167 case 8: 168 val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT | 169 EP93XXFB_PIXELMODE_SHIFT_1P_18B; 170 171 info->var.red.offset = 0; 172 info->var.red.length = 8; 173 info->var.green.offset = 0; 174 info->var.green.length = 8; 175 info->var.blue.offset = 0; 176 info->var.blue.length = 8; 177 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 178 break; 179 180 case 16: 181 val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 | 182 EP93XXFB_PIXELMODE_SHIFT_1P_18B; 183 184 info->var.red.offset = 11; 185 info->var.red.length = 5; 186 info->var.green.offset = 5; 187 info->var.green.length = 6; 188 info->var.blue.offset = 0; 189 info->var.blue.length = 5; 190 info->fix.visual = FB_VISUAL_TRUECOLOR; 191 break; 192 193 case 24: 194 val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 | 195 EP93XXFB_PIXELMODE_SHIFT_1P_24B; 196 197 info->var.red.offset = 16; 198 info->var.red.length = 8; 199 info->var.green.offset = 8; 200 info->var.green.length = 8; 201 info->var.blue.offset = 0; 202 info->var.blue.length = 8; 203 info->fix.visual = FB_VISUAL_TRUECOLOR; 204 break; 205 206 case 32: 207 val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 | 208 EP93XXFB_PIXELMODE_SHIFT_1P_24B; 209 210 info->var.red.offset = 16; 211 info->var.red.length = 8; 212 info->var.green.offset = 8; 213 info->var.green.length = 8; 214 info->var.blue.offset = 0; 215 info->var.blue.length = 8; 216 info->fix.visual = FB_VISUAL_TRUECOLOR; 217 break; 218 219 default: 220 return -EINVAL; 221 } 222 223 ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE); 224 return 0; 225} 226 227static void ep93xxfb_set_timing(struct fb_info *info) 228{ 229 struct ep93xx_fbi *fbi = info->par; 230 unsigned int vlines_total, hclks_total, start, stop; 231 232 vlines_total = info->var.yres + info->var.upper_margin + 233 info->var.lower_margin + info->var.vsync_len - 1; 234 235 hclks_total = info->var.xres + info->var.left_margin + 236 info->var.right_margin + info->var.hsync_len - 1; 237 238 ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL); 239 ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL); 240 241 start = vlines_total; 242 stop = vlines_total - info->var.vsync_len; 243 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC); 244 245 start = vlines_total - info->var.vsync_len - info->var.upper_margin; 246 stop = info->var.lower_margin - 1; 247 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK); 248 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE); 249 250 start = vlines_total; 251 stop = vlines_total + 1; 252 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK); 253 254 start = hclks_total; 255 stop = hclks_total - info->var.hsync_len; 256 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC); 257 258 start = hclks_total - info->var.hsync_len - info->var.left_margin; 259 stop = info->var.right_margin - 1; 260 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK); 261 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE); 262 263 start = hclks_total; 264 stop = hclks_total; 265 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK); 266 267 ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY); 268} 269 270static int ep93xxfb_set_par(struct fb_info *info) 271{ 272 struct ep93xx_fbi *fbi = info->par; 273 274 clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock)); 275 276 ep93xxfb_set_timing(info); 277 278 info->fix.line_length = info->var.xres_virtual * 279 info->var.bits_per_pixel / 8; 280 281 ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE); 282 ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES); 283 ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel) 284 / 32) - 1, EP93XXFB_LINE_LENGTH); 285 ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP); 286 ep93xxfb_set_video_attribs(info); 287 return 0; 288} 289 290static int ep93xxfb_check_var(struct fb_var_screeninfo *var, 291 struct fb_info *info) 292{ 293 int err; 294 295 err = ep93xxfb_set_pixelmode(info); 296 if (err) 297 return err; 298 299 var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES); 300 var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES); 301 var->xres_virtual = max(var->xres_virtual, var->xres); 302 303 var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES); 304 var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES); 305 var->yres_virtual = max(var->yres_virtual, var->yres); 306 307 return 0; 308} 309 310static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma) 311{ 312 unsigned int offset = vma->vm_pgoff << PAGE_SHIFT; 313 314 if (offset < info->fix.smem_len) { 315 return dma_mmap_wc(info->device, vma, info->screen_base, 316 info->fix.smem_start, info->fix.smem_len); 317 } 318 319 return -EINVAL; 320} 321 322static int ep93xxfb_blank(int blank_mode, struct fb_info *info) 323{ 324 struct ep93xx_fbi *fbi = info->par; 325 unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS); 326 327 if (blank_mode) { 328 if (fbi->mach_info->blank) 329 fbi->mach_info->blank(blank_mode, info); 330 ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE, 331 EP93XXFB_ATTRIBS); 332 clk_disable(fbi->clk); 333 } else { 334 clk_enable(fbi->clk); 335 ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE, 336 EP93XXFB_ATTRIBS); 337 if (fbi->mach_info->blank) 338 fbi->mach_info->blank(blank_mode, info); 339 } 340 341 return 0; 342} 343 344static inline int ep93xxfb_convert_color(int val, int width) 345{ 346 return ((val << width) + 0x7fff - val) >> 16; 347} 348 349static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red, 350 unsigned int green, unsigned int blue, 351 unsigned int transp, struct fb_info *info) 352{ 353 struct ep93xx_fbi *fbi = info->par; 354 unsigned int *pal = info->pseudo_palette; 355 unsigned int ctrl, i, rgb, lut_current, lut_stat; 356 357 switch (info->fix.visual) { 358 case FB_VISUAL_PSEUDOCOLOR: 359 if (regno > 255) 360 return 1; 361 rgb = ((red & 0xff00) << 8) | (green & 0xff00) | 362 ((blue & 0xff00) >> 8); 363 364 pal[regno] = rgb; 365 ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2))); 366 ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL); 367 lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT); 368 lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH); 369 370 if (lut_stat == lut_current) { 371 for (i = 0; i < 256; i++) { 372 ep93xxfb_writel(fbi, pal[i], 373 EP93XXFB_COLOR_LUT + (i << 2)); 374 } 375 376 ep93xxfb_writel(fbi, 377 ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH, 378 EP93XXFB_LUT_SW_CONTROL); 379 } 380 break; 381 382 case FB_VISUAL_TRUECOLOR: 383 if (regno > 16) 384 return 1; 385 386 red = ep93xxfb_convert_color(red, info->var.red.length); 387 green = ep93xxfb_convert_color(green, info->var.green.length); 388 blue = ep93xxfb_convert_color(blue, info->var.blue.length); 389 transp = ep93xxfb_convert_color(transp, 390 info->var.transp.length); 391 392 pal[regno] = (red << info->var.red.offset) | 393 (green << info->var.green.offset) | 394 (blue << info->var.blue.offset) | 395 (transp << info->var.transp.offset); 396 break; 397 398 default: 399 return 1; 400 } 401 402 return 0; 403} 404 405static const struct fb_ops ep93xxfb_ops = { 406 .owner = THIS_MODULE, 407 .fb_check_var = ep93xxfb_check_var, 408 .fb_set_par = ep93xxfb_set_par, 409 .fb_blank = ep93xxfb_blank, 410 .fb_fillrect = cfb_fillrect, 411 .fb_copyarea = cfb_copyarea, 412 .fb_imageblit = cfb_imageblit, 413 .fb_setcolreg = ep93xxfb_setcolreg, 414 .fb_mmap = ep93xxfb_mmap, 415}; 416 417static int ep93xxfb_alloc_videomem(struct fb_info *info) 418{ 419 char __iomem *virt_addr; 420 dma_addr_t phys_addr; 421 unsigned int fb_size; 422 423 /* Maximum 16bpp -> used memory is maximum x*y*2 bytes */ 424 fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES * 2; 425 426 virt_addr = dma_alloc_wc(info->device, fb_size, &phys_addr, GFP_KERNEL); 427 if (!virt_addr) 428 return -ENOMEM; 429 430 /* 431 * There is a bug in the ep93xx framebuffer which causes problems 432 * if bit 27 of the physical address is set. 433 * See: https://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2 434 * There does not seem to be any official errata for this, but I 435 * have confirmed the problem exists on my hardware (ep9315) at 436 * least. 437 */ 438 if (check_screenpage_bug && phys_addr & (1 << 27)) { 439 fb_err(info, "ep93xx framebuffer bug. phys addr (0x%x) " 440 "has bit 27 set: cannot init framebuffer\n", 441 phys_addr); 442 443 dma_free_coherent(info->device, fb_size, virt_addr, phys_addr); 444 return -ENOMEM; 445 } 446 447 info->fix.smem_start = phys_addr; 448 info->fix.smem_len = fb_size; 449 info->screen_base = virt_addr; 450 451 return 0; 452} 453 454static void ep93xxfb_dealloc_videomem(struct fb_info *info) 455{ 456 if (info->screen_base) 457 dma_free_coherent(info->device, info->fix.smem_len, 458 info->screen_base, info->fix.smem_start); 459} 460 461static int ep93xxfb_probe(struct platform_device *pdev) 462{ 463 struct ep93xxfb_mach_info *mach_info = dev_get_platdata(&pdev->dev); 464 struct fb_info *info; 465 struct ep93xx_fbi *fbi; 466 struct resource *res; 467 char *video_mode; 468 int err; 469 470 if (!mach_info) 471 return -EINVAL; 472 473 info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev); 474 if (!info) 475 return -ENOMEM; 476 477 platform_set_drvdata(pdev, info); 478 fbi = info->par; 479 fbi->mach_info = mach_info; 480 481 err = fb_alloc_cmap(&info->cmap, 256, 0); 482 if (err) 483 goto failed_cmap; 484 485 err = ep93xxfb_alloc_videomem(info); 486 if (err) 487 goto failed_videomem; 488 489 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 490 if (!res) { 491 err = -ENXIO; 492 goto failed_resource; 493 } 494 495 /* 496 * FIXME - We don't do a request_mem_region here because we are 497 * sharing the register space with the backlight driver (see 498 * drivers/video/backlight/ep93xx_bl.c) and doing so will cause 499 * the second loaded driver to return -EBUSY. 500 * 501 * NOTE: No locking is required; the backlight does not touch 502 * any of the framebuffer registers. 503 */ 504 fbi->res = res; 505 fbi->mmio_base = devm_ioremap(&pdev->dev, res->start, 506 resource_size(res)); 507 if (!fbi->mmio_base) { 508 err = -ENXIO; 509 goto failed_resource; 510 } 511 512 strcpy(info->fix.id, pdev->name); 513 info->fbops = &ep93xxfb_ops; 514 info->fix.type = FB_TYPE_PACKED_PIXELS; 515 info->fix.accel = FB_ACCEL_NONE; 516 info->var.activate = FB_ACTIVATE_NOW; 517 info->var.vmode = FB_VMODE_NONINTERLACED; 518 info->node = -1; 519 info->state = FBINFO_STATE_RUNNING; 520 info->pseudo_palette = &fbi->pseudo_palette; 521 522 fb_get_options("ep93xx-fb", &video_mode); 523 err = fb_find_mode(&info->var, info, video_mode, 524 NULL, 0, NULL, 16); 525 if (err == 0) { 526 fb_err(info, "No suitable video mode found\n"); 527 err = -EINVAL; 528 goto failed_resource; 529 } 530 531 if (mach_info->setup) { 532 err = mach_info->setup(pdev); 533 if (err) 534 goto failed_resource; 535 } 536 537 err = ep93xxfb_check_var(&info->var, info); 538 if (err) 539 goto failed_check; 540 541 fbi->clk = devm_clk_get(&pdev->dev, NULL); 542 if (IS_ERR(fbi->clk)) { 543 err = PTR_ERR(fbi->clk); 544 fbi->clk = NULL; 545 goto failed_check; 546 } 547 548 ep93xxfb_set_par(info); 549 err = clk_prepare_enable(fbi->clk); 550 if (err) 551 goto failed_check; 552 553 err = register_framebuffer(info); 554 if (err) 555 goto failed_framebuffer; 556 557 fb_info(info, "registered. Mode = %dx%d-%d\n", 558 info->var.xres, info->var.yres, info->var.bits_per_pixel); 559 return 0; 560 561failed_framebuffer: 562 clk_disable_unprepare(fbi->clk); 563failed_check: 564 if (fbi->mach_info->teardown) 565 fbi->mach_info->teardown(pdev); 566failed_resource: 567 ep93xxfb_dealloc_videomem(info); 568failed_videomem: 569 fb_dealloc_cmap(&info->cmap); 570failed_cmap: 571 kfree(info); 572 573 return err; 574} 575 576static void ep93xxfb_remove(struct platform_device *pdev) 577{ 578 struct fb_info *info = platform_get_drvdata(pdev); 579 struct ep93xx_fbi *fbi = info->par; 580 581 unregister_framebuffer(info); 582 clk_disable_unprepare(fbi->clk); 583 ep93xxfb_dealloc_videomem(info); 584 fb_dealloc_cmap(&info->cmap); 585 586 if (fbi->mach_info->teardown) 587 fbi->mach_info->teardown(pdev); 588 589 kfree(info); 590} 591 592static struct platform_driver ep93xxfb_driver = { 593 .probe = ep93xxfb_probe, 594 .remove_new = ep93xxfb_remove, 595 .driver = { 596 .name = "ep93xx-fb", 597 }, 598}; 599module_platform_driver(ep93xxfb_driver); 600 601MODULE_DESCRIPTION("EP93XX Framebuffer Driver"); 602MODULE_ALIAS("platform:ep93xx-fb"); 603MODULE_AUTHOR("Ryan Mallon, " 604 "H Hartley Sweeten <hsweeten@visionengravers.com"); 605MODULE_LICENSE("GPL"); 606