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1/*2 * BRIEF MODULE DESCRIPTION3 * Au1100 LCD Driver.4 *5 * Rewritten for 2.6 by Embedded Alley Solutions6 * <source@embeddedalley.com>, based on submissions by7 * Karl Lessard <klessard@sunrisetelecom.com>8 * <c.pellegrin@exadron.com>9 *10 * PM support added by Rodolfo Giometti <giometti@linux.it>11 * Cursor enable/disable by Rodolfo Giometti <giometti@linux.it>12 *13 * Copyright 2002 MontaVista Software14 * Author: MontaVista Software, Inc.15 * ppopov@mvista.com or source@mvista.com16 *17 * Copyright 2002 Alchemy Semiconductor18 * Author: Alchemy Semiconductor19 *20 * Based on:21 * linux/drivers/video/skeletonfb.c -- Skeleton for a frame buffer device22 * Created 28 Dec 1997 by Geert Uytterhoeven23 *24 * This program is free software; you can redistribute it and/or modify it25 * under the terms of the GNU General Public License as published by the26 * Free Software Foundation; either version 2 of the License, or (at your27 * option) any later version.28 *29 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED30 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF31 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN32 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF35 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON36 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.39 *40 * You should have received a copy of the GNU General Public License along41 * with this program; if not, write to the Free Software Foundation, Inc.,42 * 675 Mass Ave, Cambridge, MA 02139, USA.43 */44#include <linux/clk.h>45#include <linux/module.h>46#include <linux/kernel.h>47#include <linux/errno.h>48#include <linux/string.h>49#include <linux/mm.h>50#include <linux/fb.h>51#include <linux/init.h>52#include <linux/interrupt.h>53#include <linux/ctype.h>54#include <linux/dma-mapping.h>55#include <linux/platform_device.h>56#include <linux/slab.h>57 58#include <asm/mach-au1x00/au1000.h>59 60#define DEBUG 061 62#include "au1100fb.h"63 64#define DRIVER_NAME "au1100fb"65#define DRIVER_DESC "LCD controller driver for AU1100 processors"66 67#define to_au1100fb_device(_info) \68 (_info ? container_of(_info, struct au1100fb_device, info) : NULL);69 70/* Bitfields format supported by the controller. Note that the order of formats71 * SHOULD be the same as in the LCD_CONTROL_SBPPF field, so we can retrieve the72 * right pixel format by doing rgb_bitfields[LCD_CONTROL_SBPPF_XXX >> LCD_CONTROL_SBPPF]73 */74struct fb_bitfield rgb_bitfields[][4] =75{76 /* Red, Green, Blue, Transp */77 { { 10, 6, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },78 { { 11, 5, 0 }, { 5, 6, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },79 { { 11, 5, 0 }, { 6, 5, 0 }, { 0, 6, 0 }, { 0, 0, 0 } },80 { { 10, 5, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 15, 1, 0 } },81 { { 11, 5, 0 }, { 6, 5, 0 }, { 1, 5, 0 }, { 0, 1, 0 } },82 83 /* The last is used to describe 12bpp format */84 { { 8, 4, 0 }, { 4, 4, 0 }, { 0, 4, 0 }, { 0, 0, 0 } },85};86 87static struct fb_fix_screeninfo au1100fb_fix = {88 .id = "AU1100 FB",89 .xpanstep = 1,90 .ypanstep = 1,91 .type = FB_TYPE_PACKED_PIXELS,92 .accel = FB_ACCEL_NONE,93};94 95static struct fb_var_screeninfo au1100fb_var = {96 .activate = FB_ACTIVATE_NOW,97 .height = -1,98 .width = -1,99 .vmode = FB_VMODE_NONINTERLACED,100};101 102/* fb_blank103 * Blank the screen. Depending on the mode, the screen will be104 * activated with the backlight color, or desactivated105 */106static int au1100fb_fb_blank(int blank_mode, struct fb_info *fbi)107{108 struct au1100fb_device *fbdev = to_au1100fb_device(fbi);109 110 print_dbg("fb_blank %d %p", blank_mode, fbi);111 112 switch (blank_mode) {113 114 case VESA_NO_BLANKING:115 /* Turn on panel */116 fbdev->regs->lcd_control |= LCD_CONTROL_GO;117 wmb(); /* drain writebuffer */118 break;119 120 case VESA_VSYNC_SUSPEND:121 case VESA_HSYNC_SUSPEND:122 case VESA_POWERDOWN:123 /* Turn off panel */124 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;125 wmb(); /* drain writebuffer */126 break;127 default:128 break;129 130 }131 return 0;132}133 134/*135 * Set hardware with var settings. This will enable the controller with a specific136 * mode, normally validated with the fb_check_var method137 */138int au1100fb_setmode(struct au1100fb_device *fbdev)139{140 struct fb_info *info = &fbdev->info;141 u32 words;142 int index;143 144 if (!fbdev)145 return -EINVAL;146 147 /* Update var-dependent FB info */148 if (panel_is_active(fbdev->panel) || panel_is_color(fbdev->panel)) {149 if (info->var.bits_per_pixel <= 8) {150 /* palettized */151 info->var.red.offset = 0;152 info->var.red.length = info->var.bits_per_pixel;153 info->var.red.msb_right = 0;154 155 info->var.green.offset = 0;156 info->var.green.length = info->var.bits_per_pixel;157 info->var.green.msb_right = 0;158 159 info->var.blue.offset = 0;160 info->var.blue.length = info->var.bits_per_pixel;161 info->var.blue.msb_right = 0;162 163 info->var.transp.offset = 0;164 info->var.transp.length = 0;165 info->var.transp.msb_right = 0;166 167 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;168 info->fix.line_length = info->var.xres_virtual /169 (8/info->var.bits_per_pixel);170 } else {171 /* non-palettized */172 index = (fbdev->panel->control_base & LCD_CONTROL_SBPPF_MASK) >> LCD_CONTROL_SBPPF_BIT;173 info->var.red = rgb_bitfields[index][0];174 info->var.green = rgb_bitfields[index][1];175 info->var.blue = rgb_bitfields[index][2];176 info->var.transp = rgb_bitfields[index][3];177 178 info->fix.visual = FB_VISUAL_TRUECOLOR;179 info->fix.line_length = info->var.xres_virtual << 1; /* depth=16 */180 }181 } else {182 /* mono */183 info->fix.visual = FB_VISUAL_MONO10;184 info->fix.line_length = info->var.xres_virtual / 8;185 }186 187 info->screen_size = info->fix.line_length * info->var.yres_virtual;188 info->var.rotate = ((fbdev->panel->control_base&LCD_CONTROL_SM_MASK) \189 >> LCD_CONTROL_SM_BIT) * 90;190 191 /* Determine BPP mode and format */192 fbdev->regs->lcd_control = fbdev->panel->control_base;193 fbdev->regs->lcd_horztiming = fbdev->panel->horztiming;194 fbdev->regs->lcd_verttiming = fbdev->panel->verttiming;195 fbdev->regs->lcd_clkcontrol = fbdev->panel->clkcontrol_base;196 fbdev->regs->lcd_intenable = 0;197 fbdev->regs->lcd_intstatus = 0;198 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(fbdev->fb_phys);199 200 if (panel_is_dual(fbdev->panel)) {201 /* Second panel display seconf half of screen if possible,202 * otherwise display the same as the first panel */203 if (info->var.yres_virtual >= (info->var.yres << 1)) {204 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys +205 (info->fix.line_length *206 (info->var.yres_virtual >> 1)));207 } else {208 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys);209 }210 }211 212 words = info->fix.line_length / sizeof(u32);213 if (!info->var.rotate || (info->var.rotate == 180)) {214 words *= info->var.yres_virtual;215 if (info->var.rotate /* 180 */) {216 words -= (words % 8); /* should be divisable by 8 */217 }218 }219 fbdev->regs->lcd_words = LCD_WRD_WRDS_N(words);220 221 fbdev->regs->lcd_pwmdiv = 0;222 fbdev->regs->lcd_pwmhi = 0;223 224 /* Resume controller */225 fbdev->regs->lcd_control |= LCD_CONTROL_GO;226 mdelay(10);227 au1100fb_fb_blank(VESA_NO_BLANKING, info);228 229 return 0;230}231 232/* fb_setcolreg233 * Set color in LCD palette.234 */235int au1100fb_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi)236{237 struct au1100fb_device *fbdev;238 u32 *palette;239 u32 value;240 241 fbdev = to_au1100fb_device(fbi);242 palette = fbdev->regs->lcd_palettebase;243 244 if (regno > (AU1100_LCD_NBR_PALETTE_ENTRIES - 1))245 return -EINVAL;246 247 if (fbi->var.grayscale) {248 /* Convert color to grayscale */249 red = green = blue =250 (19595 * red + 38470 * green + 7471 * blue) >> 16;251 }252 253 if (fbi->fix.visual == FB_VISUAL_TRUECOLOR) {254 /* Place color in the pseudopalette */255 if (regno > 16)256 return -EINVAL;257 258 palette = (u32*)fbi->pseudo_palette;259 260 red >>= (16 - fbi->var.red.length);261 green >>= (16 - fbi->var.green.length);262 blue >>= (16 - fbi->var.blue.length);263 264 value = (red << fbi->var.red.offset) |265 (green << fbi->var.green.offset)|266 (blue << fbi->var.blue.offset);267 value &= 0xFFFF;268 269 } else if (panel_is_active(fbdev->panel)) {270 /* COLOR TFT PALLETTIZED (use RGB 565) */271 value = (red & 0xF800)|((green >> 5) & 0x07E0)|((blue >> 11) & 0x001F);272 value &= 0xFFFF;273 274 } else if (panel_is_color(fbdev->panel)) {275 /* COLOR STN MODE */276 value = (((panel_swap_rgb(fbdev->panel) ? blue : red) >> 12) & 0x000F) |277 ((green >> 8) & 0x00F0) |278 (((panel_swap_rgb(fbdev->panel) ? red : blue) >> 4) & 0x0F00);279 value &= 0xFFF;280 } else {281 /* MONOCHROME MODE */282 value = (green >> 12) & 0x000F;283 value &= 0xF;284 }285 286 palette[regno] = value;287 288 return 0;289}290 291/* fb_pan_display292 * Pan display in x and/or y as specified293 */294int au1100fb_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)295{296 struct au1100fb_device *fbdev;297 int dy;298 299 fbdev = to_au1100fb_device(fbi);300 301 print_dbg("fb_pan_display %p %p", var, fbi);302 303 if (!var || !fbdev) {304 return -EINVAL;305 }306 307 if (var->xoffset - fbi->var.xoffset) {308 /* No support for X panning for now! */309 return -EINVAL;310 }311 312 print_dbg("fb_pan_display 2 %p %p", var, fbi);313 dy = var->yoffset - fbi->var.yoffset;314 if (dy) {315 316 u32 dmaaddr;317 318 print_dbg("Panning screen of %d lines", dy);319 320 dmaaddr = fbdev->regs->lcd_dmaaddr0;321 dmaaddr += (fbi->fix.line_length * dy);322 323 /* TODO: Wait for current frame to finished */324 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);325 326 if (panel_is_dual(fbdev->panel)) {327 dmaaddr = fbdev->regs->lcd_dmaaddr1;328 dmaaddr += (fbi->fix.line_length * dy);329 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);330 }331 }332 print_dbg("fb_pan_display 3 %p %p", var, fbi);333 334 return 0;335}336 337/* fb_mmap338 * Map video memory in user space. We don't use the generic fb_mmap method mainly339 * to allow the use of the TLB streaming flag (CCA=6)340 */341int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)342{343 struct au1100fb_device *fbdev = to_au1100fb_device(fbi);344 345 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);346 347 pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6348 349 return dma_mmap_coherent(fbdev->dev, vma, fbdev->fb_mem, fbdev->fb_phys,350 fbdev->fb_len);351}352 353static const struct fb_ops au1100fb_ops = {354 .owner = THIS_MODULE,355 __FB_DEFAULT_IOMEM_OPS_RDWR,356 .fb_setcolreg = au1100fb_fb_setcolreg,357 .fb_blank = au1100fb_fb_blank,358 .fb_pan_display = au1100fb_fb_pan_display,359 __FB_DEFAULT_IOMEM_OPS_DRAW,360 .fb_mmap = au1100fb_fb_mmap,361};362 363 364/*-------------------------------------------------------------------------*/365 366static int au1100fb_setup(struct au1100fb_device *fbdev)367{368 char *this_opt, *options;369 int num_panels = ARRAY_SIZE(known_lcd_panels);370 371 if (num_panels <= 0) {372 print_err("No LCD panels supported by driver!");373 return -ENODEV;374 }375 376 if (fb_get_options(DRIVER_NAME, &options))377 return -ENODEV;378 if (!options)379 return -ENODEV;380 381 while ((this_opt = strsep(&options, ",")) != NULL) {382 /* Panel option */383 if (!strncmp(this_opt, "panel:", 6)) {384 int i;385 this_opt += 6;386 for (i = 0; i < num_panels; i++) {387 if (!strncmp(this_opt, known_lcd_panels[i].name,388 strlen(this_opt))) {389 fbdev->panel = &known_lcd_panels[i];390 fbdev->panel_idx = i;391 break;392 }393 }394 if (i >= num_panels) {395 print_warn("Panel '%s' not supported!", this_opt);396 return -ENODEV;397 }398 }399 /* Unsupported option */400 else401 print_warn("Unsupported option \"%s\"", this_opt);402 }403 404 print_info("Panel=%s", fbdev->panel->name);405 406 return 0;407}408 409static int au1100fb_drv_probe(struct platform_device *dev)410{411 struct au1100fb_device *fbdev;412 struct resource *regs_res;413 struct clk *c;414 415 /* Allocate new device private */416 fbdev = devm_kzalloc(&dev->dev, sizeof(*fbdev), GFP_KERNEL);417 if (!fbdev)418 return -ENOMEM;419 420 if (au1100fb_setup(fbdev))421 goto failed;422 423 platform_set_drvdata(dev, (void *)fbdev);424 fbdev->dev = &dev->dev;425 426 /* Allocate region for our registers and map them */427 regs_res = platform_get_resource(dev, IORESOURCE_MEM, 0);428 if (!regs_res) {429 print_err("fail to retrieve registers resource");430 return -EFAULT;431 }432 433 au1100fb_fix.mmio_start = regs_res->start;434 au1100fb_fix.mmio_len = resource_size(regs_res);435 436 if (!devm_request_mem_region(&dev->dev,437 au1100fb_fix.mmio_start,438 au1100fb_fix.mmio_len,439 DRIVER_NAME)) {440 print_err("fail to lock memory region at 0x%08lx",441 au1100fb_fix.mmio_start);442 return -EBUSY;443 }444 445 fbdev->regs = (struct au1100fb_regs*)KSEG1ADDR(au1100fb_fix.mmio_start);446 447 print_dbg("Register memory map at %p", fbdev->regs);448 print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len);449 450 c = clk_get(NULL, "lcd_intclk");451 if (!IS_ERR(c)) {452 fbdev->lcdclk = c;453 clk_set_rate(c, 48000000);454 clk_prepare_enable(c);455 }456 457 /* Allocate the framebuffer to the maximum screen size * nbr of video buffers */458 fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres *459 (fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS;460 461 fbdev->fb_mem = dmam_alloc_coherent(&dev->dev,462 PAGE_ALIGN(fbdev->fb_len),463 &fbdev->fb_phys, GFP_KERNEL);464 if (!fbdev->fb_mem) {465 print_err("fail to allocate framebuffer (size: %dK))",466 fbdev->fb_len / 1024);467 return -ENOMEM;468 }469 470 au1100fb_fix.smem_start = fbdev->fb_phys;471 au1100fb_fix.smem_len = fbdev->fb_len;472 473 print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);474 print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);475 476 /* load the panel info into the var struct */477 au1100fb_var.bits_per_pixel = fbdev->panel->bpp;478 au1100fb_var.xres = fbdev->panel->xres;479 au1100fb_var.xres_virtual = au1100fb_var.xres;480 au1100fb_var.yres = fbdev->panel->yres;481 au1100fb_var.yres_virtual = au1100fb_var.yres;482 483 fbdev->info.screen_base = fbdev->fb_mem;484 fbdev->info.fbops = &au1100fb_ops;485 fbdev->info.fix = au1100fb_fix;486 487 fbdev->info.pseudo_palette =488 devm_kcalloc(&dev->dev, 16, sizeof(u32), GFP_KERNEL);489 if (!fbdev->info.pseudo_palette)490 return -ENOMEM;491 492 if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {493 print_err("Fail to allocate colormap (%d entries)",494 AU1100_LCD_NBR_PALETTE_ENTRIES);495 return -EFAULT;496 }497 498 fbdev->info.var = au1100fb_var;499 500 /* Set h/w registers */501 au1100fb_setmode(fbdev);502 503 /* Register new framebuffer */504 if (register_framebuffer(&fbdev->info) < 0) {505 print_err("cannot register new framebuffer");506 goto failed;507 }508 509 return 0;510 511failed:512 if (fbdev->lcdclk) {513 clk_disable_unprepare(fbdev->lcdclk);514 clk_put(fbdev->lcdclk);515 }516 if (fbdev->info.cmap.len != 0) {517 fb_dealloc_cmap(&fbdev->info.cmap);518 }519 520 return -ENODEV;521}522 523void au1100fb_drv_remove(struct platform_device *dev)524{525 struct au1100fb_device *fbdev = NULL;526 527 fbdev = platform_get_drvdata(dev);528 529#if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)530 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);531#endif532 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;533 534 /* Clean up all probe data */535 unregister_framebuffer(&fbdev->info);536 537 fb_dealloc_cmap(&fbdev->info.cmap);538 539 if (fbdev->lcdclk) {540 clk_disable_unprepare(fbdev->lcdclk);541 clk_put(fbdev->lcdclk);542 }543}544 545#ifdef CONFIG_PM546static struct au1100fb_regs fbregs;547 548int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)549{550 struct au1100fb_device *fbdev = platform_get_drvdata(dev);551 552 if (!fbdev)553 return 0;554 555 /* Blank the LCD */556 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);557 558 clk_disable(fbdev->lcdclk);559 560 memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));561 562 return 0;563}564 565int au1100fb_drv_resume(struct platform_device *dev)566{567 struct au1100fb_device *fbdev = platform_get_drvdata(dev);568 569 if (!fbdev)570 return 0;571 572 memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));573 574 clk_enable(fbdev->lcdclk);575 576 /* Unblank the LCD */577 au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);578 579 return 0;580}581#else582#define au1100fb_drv_suspend NULL583#define au1100fb_drv_resume NULL584#endif585 586static struct platform_driver au1100fb_driver = {587 .driver = {588 .name = "au1100-lcd",589 },590 .probe = au1100fb_drv_probe,591 .remove = au1100fb_drv_remove,592 .suspend = au1100fb_drv_suspend,593 .resume = au1100fb_drv_resume,594};595module_platform_driver(au1100fb_driver);596 597MODULE_DESCRIPTION(DRIVER_DESC);598MODULE_LICENSE("GPL");599