/* * linux/drivers/video/pxafb.c * * Copyright (C) 1999 Eric A. Thomas. * Copyright (C) 2004 Jean-Frederic Clere. * Copyright (C) 2004 Ian Campbell. * Copyright (C) 2004 Jeff Lackey. * Based on sa1100fb.c Copyright (C) 1999 Eric A. Thomas * which in turn is * Based on acornfb.c Copyright (C) Russell King. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive for * more details. * * Intel PXA250/210 LCD Controller Frame Buffer Driver * * Please direct your questions and comments on this driver to the following * email address: * * linux-arm-kernel@lists.arm.linux.org.uk * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Complain if VAR is out of range. */ #define DEBUG_VAR 1 #include "pxafb.h" /* Bits which should not be set in machine configuration structures */ #define LCCR0_INVALID_CONFIG_MASK (LCCR0_OUM | LCCR0_BM | LCCR0_QDM |\ LCCR0_DIS | LCCR0_EFM | LCCR0_IUM |\ LCCR0_SFM | LCCR0_LDM | LCCR0_ENB) #define LCCR3_INVALID_CONFIG_MASK (LCCR3_HSP | LCCR3_VSP |\ LCCR3_PCD | LCCR3_BPP) static void (*pxafb_backlight_power)(int); static void (*pxafb_lcd_power)(int, struct fb_var_screeninfo *); static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *); static void set_ctrlr_state(struct pxafb_info *fbi, u_int state); static inline void pxafb_schedule_work(struct pxafb_info *fbi, u_int state) { unsigned long flags; local_irq_save(flags); /* * We need to handle two requests being made at the same time. * There are two important cases: * 1. When we are changing VT (C_REENABLE) while unblanking * (C_ENABLE) We must perform the unblanking, which will * do our REENABLE for us. * 2. When we are blanking, but immediately unblank before * we have blanked. We do the "REENABLE" thing here as * well, just to be sure. */ if (fbi->task_state == C_ENABLE && state == C_REENABLE) state = (u_int) -1; if (fbi->task_state == C_DISABLE && state == C_ENABLE) state = C_REENABLE; if (state != (u_int)-1) { fbi->task_state = state; schedule_work(&fbi->task); } local_irq_restore(flags); } static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) { chan &= 0xffff; chan >>= 16 - bf->length; return chan << bf->offset; } static int pxafb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue, u_int trans, struct fb_info *info) { struct pxafb_info *fbi = (struct pxafb_info *)info; u_int val; if (regno >= fbi->palette_size) return 1; if (fbi->fb.var.grayscale) { fbi->palette_cpu[regno] = ((blue >> 8) & 0x00ff); return 0; } switch (fbi->lccr4 & LCCR4_PAL_FOR_MASK) { case LCCR4_PAL_FOR_0: val = ((red >> 0) & 0xf800); val |= ((green >> 5) & 0x07e0); val |= ((blue >> 11) & 0x001f); fbi->palette_cpu[regno] = val; break; case LCCR4_PAL_FOR_1: val = ((red << 8) & 0x00f80000); val |= ((green >> 0) & 0x0000fc00); val |= ((blue >> 8) & 0x000000f8); ((u32 *)(fbi->palette_cpu))[regno] = val; break; case LCCR4_PAL_FOR_2: val = ((red << 8) & 0x00fc0000); val |= ((green >> 0) & 0x0000fc00); val |= ((blue >> 8) & 0x000000fc); ((u32 *)(fbi->palette_cpu))[regno] = val; break; } return 0; } static int pxafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, u_int trans, struct fb_info *info) { struct pxafb_info *fbi = (struct pxafb_info *)info; unsigned int val; int ret = 1; /* * If inverse mode was selected, invert all the colours * rather than the register number. The register number * is what you poke into the framebuffer to produce the * colour you requested. */ if (fbi->cmap_inverse) { red = 0xffff - red; green = 0xffff - green; blue = 0xffff - blue; } /* * If greyscale is true, then we convert the RGB value * to greyscale no matter what visual we are using. */ if (fbi->fb.var.grayscale) red = green = blue = (19595 * red + 38470 * green + 7471 * blue) >> 16; switch (fbi->fb.fix.visual) { case FB_VISUAL_TRUECOLOR: /* * 16-bit True Colour. We encode the RGB value * according to the RGB bitfield information. */ if (regno < 16) { u32 *pal = fbi->fb.pseudo_palette; val = chan_to_field(red, &fbi->fb.var.red); val |= chan_to_field(green, &fbi->fb.var.green); val |= chan_to_field(blue, &fbi->fb.var.blue); pal[regno] = val; ret = 0; } break; case FB_VISUAL_STATIC_PSEUDOCOLOR: case FB_VISUAL_PSEUDOCOLOR: ret = pxafb_setpalettereg(regno, red, green, blue, trans, info); break; } return ret; } /* * pxafb_bpp_to_lccr3(): * Convert a bits per pixel value to the correct bit pattern for LCCR3 */ static int pxafb_bpp_to_lccr3(struct fb_var_screeninfo *var) { int ret = 0; switch (var->bits_per_pixel) { case 1: ret = LCCR3_1BPP; break; case 2: ret = LCCR3_2BPP; break; case 4: ret = LCCR3_4BPP; break; case 8: ret = LCCR3_8BPP; break; case 16: ret = LCCR3_16BPP; break; } return ret; } #ifdef CONFIG_CPU_FREQ /* * pxafb_display_dma_period() * Calculate the minimum period (in picoseconds) between two DMA * requests for the LCD controller. If we hit this, it means we're * doing nothing but LCD DMA. */ static unsigned int pxafb_display_dma_period(struct fb_var_screeninfo *var) { /* * Period = pixclock * bits_per_byte * bytes_per_transfer * / memory_bits_per_pixel; */ return var->pixclock * 8 * 16 / var->bits_per_pixel; } #endif /* * Select the smallest mode that allows the desired resolution to be * displayed. If desired parameters can be rounded up. */ static struct pxafb_mode_info *pxafb_getmode(struct pxafb_mach_info *mach, struct fb_var_screeninfo *var) { struct pxafb_mode_info *mode = NULL; struct pxafb_mode_info *modelist = mach->modes; unsigned int best_x = 0xffffffff, best_y = 0xffffffff; unsigned int i; for (i = 0; i < mach->num_modes; i++) { if (modelist[i].xres >= var->xres && modelist[i].yres >= var->yres && modelist[i].xres < best_x && modelist[i].yres < best_y && modelist[i].bpp >= var->bits_per_pixel) { best_x = modelist[i].xres; best_y = modelist[i].yres; mode = &modelist[i]; } } return mode; } static void pxafb_setmode(struct fb_var_screeninfo *var, struct pxafb_mode_info *mode) { var->xres = mode->xres; var->yres = mode->yres; var->bits_per_pixel = mode->bpp; var->pixclock = mode->pixclock; var->hsync_len = mode->hsync_len; var->left_margin = mode->left_margin; var->right_margin = mode->right_margin; var->vsync_len = mode->vsync_len; var->upper_margin = mode->upper_margin; var->lower_margin = mode->lower_margin; var->sync = mode->sync; var->grayscale = mode->cmap_greyscale; var->xres_virtual = var->xres; var->yres_virtual = var->yres; } /* * pxafb_check_var(): * Get the video params out of 'var'. If a value doesn't fit, round it up, * if it's too big, return -EINVAL. * * Round up in the following order: bits_per_pixel, xres, * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale, * bitfields, horizontal timing, vertical timing. */ static int pxafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { struct pxafb_info *fbi = (struct pxafb_info *)info; struct pxafb_mach_info *inf = fbi->dev->platform_data; if (var->xres < MIN_XRES) var->xres = MIN_XRES; if (var->yres < MIN_YRES) var->yres = MIN_YRES; if (inf->fixed_modes) { struct pxafb_mode_info *mode; mode = pxafb_getmode(inf, var); if (!mode) return -EINVAL; pxafb_setmode(var, mode); } else { if (var->xres > inf->modes->xres) return -EINVAL; if (var->yres > inf->modes->yres) return -EINVAL; if (var->bits_per_pixel > inf->modes->bpp) return -EINVAL; } var->xres_virtual = max(var->xres_virtual, var->xres); var->yres_virtual = max(var->yres_virtual, var->yres); /* * Setup the RGB parameters for this display. * * The pixel packing format is described on page 7-11 of the * PXA2XX Developer's Manual. */ if (var->bits_per_pixel == 16) { var->red.offset = 11; var->red.length = 5; var->green.offset = 5; var->green.length = 6; var->blue.offset = 0; var->blue.length = 5; var->transp.offset = var->transp.length = 0; } else { var->red.offset = var->green.offset = 0; var->blue.offset = var->transp.offset = 0; var->red.length = 8; var->green.length = 8; var->blue.length = 8; var->transp.length = 0; } #ifdef CONFIG_CPU_FREQ pr_debug("pxafb: dma period = %d ps, clock = %d kHz\n", pxafb_display_dma_period(var), get_clk_frequency_khz(0)); #endif return 0; } static inline void pxafb_set_truecolor(u_int is_true_color) { /* do your machine-specific setup if needed */ } /* * pxafb_set_par(): * Set the user defined part of the display for the specified console */ static int pxafb_set_par(struct fb_info *info) { struct pxafb_info *fbi = (struct pxafb_info *)info; struct fb_var_screeninfo *var = &info->var; unsigned long palette_mem_size; if (var->bits_per_pixel == 16) fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR; else if (!fbi->cmap_static) fbi->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR; else { /* * Some people have weird ideas about wanting static * pseudocolor maps. I suspect their user space * applications are broken. */ fbi->fb.fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; } fbi->fb.fix.line_length = var->xres_virtual * var->bits_per_pixel / 8; if (var->bits_per_pixel == 16) fbi->palette_size = 0; else fbi->palette_size = var->bits_per_pixel == 1 ? 4 : 1 << var->bits_per_pixel; if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0) palette_mem_size = fbi->palette_size * sizeof(u16); else palette_mem_size = fbi->palette_size * sizeof(u32); fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size); fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size; /* * Set (any) board control register to handle new color depth */ pxafb_set_truecolor(fbi->fb.fix.visual == FB_VISUAL_TRUECOLOR); if (fbi->fb.var.bits_per_pixel == 16) fb_dealloc_cmap(&fbi->fb.cmap); else fb_alloc_cmap(&fbi->fb.cmap, 1<fb.var.bits_per_pixel, 0); pxafb_activate_var(var, fbi); return 0; } /* * pxafb_blank(): * Blank the display by setting all palette values to zero. Note, the * 16 bpp mode does not really use the palette, so this will not * blank the display in all modes. */ static int pxafb_blank(int blank, struct fb_info *info) { struct pxafb_info *fbi = (struct pxafb_info *)info; int i; switch (blank) { case FB_BLANK_POWERDOWN: case FB_BLANK_VSYNC_SUSPEND: case FB_BLANK_HSYNC_SUSPEND: case FB_BLANK_NORMAL: if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR || fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) for (i = 0; i < fbi->palette_size; i++) pxafb_setpalettereg(i, 0, 0, 0, 0, info); pxafb_schedule_work(fbi, C_DISABLE); /* TODO if (pxafb_blank_helper) pxafb_blank_helper(blank); */ break; case FB_BLANK_UNBLANK: /* TODO if (pxafb_blank_helper) pxafb_blank_helper(blank); */ if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR || fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) fb_set_cmap(&fbi->fb.cmap, info); pxafb_schedule_work(fbi, C_ENABLE); } return 0; } static int pxafb_mmap(struct fb_info *info, struct vm_area_struct *vma) { struct pxafb_info *fbi = (struct pxafb_info *)info; unsigned long off = vma->vm_pgoff << PAGE_SHIFT; if (off < info->fix.smem_len) { vma->vm_pgoff += 1; return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu, fbi->map_dma, fbi->map_size); } return -EINVAL; } static struct fb_ops pxafb_ops = { .owner = THIS_MODULE, .fb_check_var = pxafb_check_var, .fb_set_par = pxafb_set_par, .fb_setcolreg = pxafb_setcolreg, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, .fb_blank = pxafb_blank, .fb_mmap = pxafb_mmap, }; /* * Calculate the PCD value from the clock rate (in picoseconds). * We take account of the PPCR clock setting. * From PXA Developer's Manual: * * PixelClock = LCLK * ------------- * 2 ( PCD + 1 ) * * PCD = LCLK * ------------- - 1 * 2(PixelClock) * * Where: * LCLK = LCD/Memory Clock * PCD = LCCR3[7:0] * * PixelClock here is in Hz while the pixclock argument given is the * period in picoseconds. Hence PixelClock = 1 / ( pixclock * 10^-12 ) * * The function get_lclk_frequency_10khz returns LCLK in units of * 10khz. Calling the result of this function lclk gives us the * following * * PCD = (lclk * 10^4 ) * ( pixclock * 10^-12 ) * -------------------------------------- - 1 * 2 * * Factoring the 10^4 and 10^-12 out gives 10^-8 == 1 / 100000000 as used below. */ static inline unsigned int get_pcd(struct pxafb_info *fbi, unsigned int pixclock) { unsigned long long pcd; /* FIXME: Need to take into account Double Pixel Clock mode * (DPC) bit? or perhaps set it based on the various clock * speeds */ pcd = (unsigned long long)(clk_get_rate(fbi->clk) / 10000); pcd *= pixclock; do_div(pcd, 100000000 * 2); /* no need for this, since we should subtract 1 anyway. they cancel */ /* pcd += 1; */ /* make up for integer math truncations */ return (unsigned int)pcd; } /* * Some touchscreens need hsync information from the video driver to * function correctly. We export it here. Note that 'hsync_time' and * the value returned from pxafb_get_hsync_time() is the *reciprocal* * of the hsync period in seconds. */ static inline void set_hsync_time(struct pxafb_info *fbi, unsigned int pcd) { unsigned long htime; if ((pcd == 0) || (fbi->fb.var.hsync_len == 0)) { fbi->hsync_time = 0; return; } htime = clk_get_rate(fbi->clk) / (pcd * fbi->fb.var.hsync_len); fbi->hsync_time = htime; } unsigned long pxafb_get_hsync_time(struct device *dev) { struct pxafb_info *fbi = dev_get_drvdata(dev); /* If display is blanked/suspended, hsync isn't active */ if (!fbi || (fbi->state != C_ENABLE)) return 0; return fbi->hsync_time; } EXPORT_SYMBOL(pxafb_get_hsync_time); /* * pxafb_activate_var(): * Configures LCD Controller based on entries in var parameter. * Settings are only written to the controller if changes were made. */ static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *fbi) { struct pxafb_lcd_reg new_regs; u_long flags; u_int lines_per_panel, pcd = get_pcd(fbi, var->pixclock); #if DEBUG_VAR if (var->xres < 16 || var->xres > 1024) printk(KERN_ERR "%s: invalid xres %d\n", fbi->fb.fix.id, var->xres); switch (var->bits_per_pixel) { case 1: case 2: case 4: case 8: case 16: break; default: printk(KERN_ERR "%s: invalid bit depth %d\n", fbi->fb.fix.id, var->bits_per_pixel); break; } if (var->hsync_len < 1 || var->hsync_len > 64) printk(KERN_ERR "%s: invalid hsync_len %d\n", fbi->fb.fix.id, var->hsync_len); if (var->left_margin < 1 || var->left_margin > 255) printk(KERN_ERR "%s: invalid left_margin %d\n", fbi->fb.fix.id, var->left_margin); if (var->right_margin < 1 || var->right_margin > 255) printk(KERN_ERR "%s: invalid right_margin %d\n", fbi->fb.fix.id, var->right_margin); if (var->yres < 1 || var->yres > 1024) printk(KERN_ERR "%s: invalid yres %d\n", fbi->fb.fix.id, var->yres); if (var->vsync_len < 1 || var->vsync_len > 64) printk(KERN_ERR "%s: invalid vsync_len %d\n", fbi->fb.fix.id, var->vsync_len); if (var->upper_margin < 0 || var->upper_margin > 255) printk(KERN_ERR "%s: invalid upper_margin %d\n", fbi->fb.fix.id, var->upper_margin); if (var->lower_margin < 0 || var->lower_margin > 255) printk(KERN_ERR "%s: invalid lower_margin %d\n", fbi->fb.fix.id, var->lower_margin); #endif new_regs.lccr0 = fbi->lccr0 | (LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM | LCCR0_QDM | LCCR0_BM | LCCR0_OUM); new_regs.lccr1 = LCCR1_DisWdth(var->xres) + LCCR1_HorSnchWdth(var->hsync_len) + LCCR1_BegLnDel(var->left_margin) + LCCR1_EndLnDel(var->right_margin); /* * If we have a dual scan LCD, we need to halve * the YRES parameter. */ lines_per_panel = var->yres; if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual) lines_per_panel /= 2; new_regs.lccr2 = LCCR2_DisHght(lines_per_panel) + LCCR2_VrtSnchWdth(var->vsync_len) + LCCR2_BegFrmDel(var->upper_margin) + LCCR2_EndFrmDel(var->lower_margin); new_regs.lccr3 = fbi->lccr3 | pxafb_bpp_to_lccr3(var) | (var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) | (var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL); if (pcd) new_regs.lccr3 |= LCCR3_PixClkDiv(pcd); /* Update shadow copy atomically */ local_irq_save(flags); /* setup dma descriptors */ fbi->dmadesc_fblow_cpu = (struct pxafb_dma_descriptor *) ((unsigned int)fbi->palette_cpu - 3*16); fbi->dmadesc_fbhigh_cpu = (struct pxafb_dma_descriptor *) ((unsigned int)fbi->palette_cpu - 2*16); fbi->dmadesc_palette_cpu = (struct pxafb_dma_descriptor *) ((unsigned int)fbi->palette_cpu - 1*16); fbi->dmadesc_fblow_dma = fbi->palette_dma - 3*16; fbi->dmadesc_fbhigh_dma = fbi->palette_dma - 2*16; fbi->dmadesc_palette_dma = fbi->palette_dma - 1*16; #define BYTES_PER_PANEL (lines_per_panel * fbi->fb.fix.line_length) /* populate descriptors */ fbi->dmadesc_fblow_cpu->fdadr = fbi->dmadesc_fblow_dma; fbi->dmadesc_fblow_cpu->fsadr = fbi->screen_dma + BYTES_PER_PANEL; fbi->dmadesc_fblow_cpu->fidr = 0; fbi->dmadesc_fblow_cpu->ldcmd = BYTES_PER_PANEL; fbi->fdadr1 = fbi->dmadesc_fblow_dma; /* only used in dual-panel mode */ fbi->dmadesc_fbhigh_cpu->fsadr = fbi->screen_dma; fbi->dmadesc_fbhigh_cpu->fidr = 0; fbi->dmadesc_fbhigh_cpu->ldcmd = BYTES_PER_PANEL; fbi->dmadesc_palette_cpu->fsadr = fbi->palette_dma; fbi->dmadesc_palette_cpu->fidr = 0; if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0) fbi->dmadesc_palette_cpu->ldcmd = fbi->palette_size * sizeof(u16); else fbi->dmadesc_palette_cpu->ldcmd = fbi->palette_size * sizeof(u32); fbi->dmadesc_palette_cpu->ldcmd |= LDCMD_PAL; if (var->bits_per_pixel == 16) { /* palette shouldn't be loaded in true-color mode */ fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_fbhigh_dma; fbi->fdadr0 = fbi->dmadesc_fbhigh_dma; /* no pal just fbhigh */ /* init it to something, even though we won't be using it */ fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_palette_dma; } else { /* flips back and forth between pal and fbhigh */ fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_fbhigh_dma; fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_palette_dma; fbi->fdadr0 = fbi->dmadesc_palette_dma; } fbi->reg_lccr0 = new_regs.lccr0; fbi->reg_lccr1 = new_regs.lccr1; fbi->reg_lccr2 = new_regs.lccr2; fbi->reg_lccr3 = new_regs.lccr3; fbi->reg_lccr4 = LCCR4 & (~LCCR4_PAL_FOR_MASK); fbi->reg_lccr4 |= (fbi->lccr4 & LCCR4_PAL_FOR_MASK); set_hsync_time(fbi, pcd); local_irq_restore(flags); /* * Only update the registers if the controller is enabled * and something has changed. */ if ((LCCR0 != fbi->reg_lccr0) || (LCCR1 != fbi->reg_lccr1) || (LCCR2 != fbi->reg_lccr2) || (LCCR3 != fbi->reg_lccr3) || (FDADR0 != fbi->fdadr0) || (FDADR1 != fbi->fdadr1)) pxafb_schedule_work(fbi, C_REENABLE); return 0; } /* * NOTE! The following functions are purely helpers for set_ctrlr_state. * Do not call them directly; set_ctrlr_state does the correct serialisation * to ensure that things happen in the right way 100% of time time. * -- rmk */ static inline void __pxafb_backlight_power(struct pxafb_info *fbi, int on) { pr_debug("pxafb: backlight o%s\n", on ? "n" : "ff"); if (pxafb_backlight_power) pxafb_backlight_power(on); } static inline void __pxafb_lcd_power(struct pxafb_info *fbi, int on) { pr_debug("pxafb: LCD power o%s\n", on ? "n" : "ff"); if (pxafb_lcd_power) pxafb_lcd_power(on, &fbi->fb.var); } static void pxafb_setup_gpio(struct pxafb_info *fbi) { int gpio, ldd_bits; unsigned int lccr0 = fbi->lccr0; /* * setup is based on type of panel supported */ /* 4 bit interface */ if ((lccr0 & LCCR0_CMS) == LCCR0_Mono && (lccr0 & LCCR0_SDS) == LCCR0_Sngl && (lccr0 & LCCR0_DPD) == LCCR0_4PixMono) ldd_bits = 4; /* 8 bit interface */ else if (((lccr0 & LCCR0_CMS) == LCCR0_Mono && ((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_DPD) == LCCR0_8PixMono)) || ((lccr0 & LCCR0_CMS) == LCCR0_Color && (lccr0 & LCCR0_PAS) == LCCR0_Pas && (lccr0 & LCCR0_SDS) == LCCR0_Sngl)) ldd_bits = 8; /* 16 bit interface */ else if ((lccr0 & LCCR0_CMS) == LCCR0_Color && ((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_PAS) == LCCR0_Act)) ldd_bits = 16; else { printk(KERN_ERR "pxafb_setup_gpio: unable to determine " "bits per pixel\n"); return; } for (gpio = 58; ldd_bits; gpio++, ldd_bits--) pxa_gpio_mode(gpio | GPIO_ALT_FN_2_OUT); pxa_gpio_mode(GPIO74_LCD_FCLK_MD); pxa_gpio_mode(GPIO75_LCD_LCLK_MD); pxa_gpio_mode(GPIO76_LCD_PCLK_MD); pxa_gpio_mode(GPIO77_LCD_ACBIAS_MD); } static void pxafb_enable_controller(struct pxafb_info *fbi) { pr_debug("pxafb: Enabling LCD controller\n"); pr_debug("fdadr0 0x%08x\n", (unsigned int) fbi->fdadr0); pr_debug("fdadr1 0x%08x\n", (unsigned int) fbi->fdadr1); pr_debug("reg_lccr0 0x%08x\n", (unsigned int) fbi->reg_lccr0); pr_debug("reg_lccr1 0x%08x\n", (unsigned int) fbi->reg_lccr1); pr_debug("reg_lccr2 0x%08x\n", (unsigned int) fbi->reg_lccr2); pr_debug("reg_lccr3 0x%08x\n", (unsigned int) fbi->reg_lccr3); /* enable LCD controller clock */ clk_enable(fbi->clk); /* Sequence from 11.7.10 */ LCCR3 = fbi->reg_lccr3; LCCR2 = fbi->reg_lccr2; LCCR1 = fbi->reg_lccr1; LCCR0 = fbi->reg_lccr0 & ~LCCR0_ENB; FDADR0 = fbi->fdadr0; FDADR1 = fbi->fdadr1; LCCR0 |= LCCR0_ENB; } static void pxafb_disable_controller(struct pxafb_info *fbi) { DECLARE_WAITQUEUE(wait, current); set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&fbi->ctrlr_wait, &wait); LCSR = 0xffffffff; /* Clear LCD Status Register */ LCCR0 &= ~LCCR0_LDM; /* Enable LCD Disable Done Interrupt */ LCCR0 |= LCCR0_DIS; /* Disable LCD Controller */ schedule_timeout(200 * HZ / 1000); remove_wait_queue(&fbi->ctrlr_wait, &wait); /* disable LCD controller clock */ clk_disable(fbi->clk); } /* * pxafb_handle_irq: Handle 'LCD DONE' interrupts. */ static irqreturn_t pxafb_handle_irq(int irq, void *dev_id) { struct pxafb_info *fbi = dev_id; unsigned int lcsr = LCSR; if (lcsr & LCSR_LDD) { LCCR0 |= LCCR0_LDM; wake_up(&fbi->ctrlr_wait); } LCSR = lcsr; return IRQ_HANDLED; } /* * This function must be called from task context only, since it will * sleep when disabling the LCD controller, or if we get two contending * processes trying to alter state. */ static void set_ctrlr_state(struct pxafb_info *fbi, u_int state) { u_int old_state; down(&fbi->ctrlr_sem); old_state = fbi->state; /* * Hack around fbcon initialisation. */ if (old_state == C_STARTUP && state == C_REENABLE) state = C_ENABLE; switch (state) { case C_DISABLE_CLKCHANGE: /* * Disable controller for clock change. If the * controller is already disabled, then do nothing. */ if (old_state != C_DISABLE && old_state != C_DISABLE_PM) { fbi->state = state; /* TODO __pxafb_lcd_power(fbi, 0); */ pxafb_disable_controller(fbi); } break; case C_DISABLE_PM: case C_DISABLE: /* * Disable controller */ if (old_state != C_DISABLE) { fbi->state = state; __pxafb_backlight_power(fbi, 0); __pxafb_lcd_power(fbi, 0); if (old_state != C_DISABLE_CLKCHANGE) pxafb_disable_controller(fbi); } break; case C_ENABLE_CLKCHANGE: /* * Enable the controller after clock change. Only * do this if we were disabled for the clock change. */ if (old_state == C_DISABLE_CLKCHANGE) { fbi->state = C_ENABLE; pxafb_enable_controller(fbi); /* TODO __pxafb_lcd_power(fbi, 1); */ } break; case C_REENABLE: /* * Re-enable the controller only if it was already * enabled. This is so we reprogram the control * registers. */ if (old_state == C_ENABLE) { __pxafb_lcd_power(fbi, 0); pxafb_disable_controller(fbi); pxafb_setup_gpio(fbi); pxafb_enable_controller(fbi); __pxafb_lcd_power(fbi, 1); } break; case C_ENABLE_PM: /* * Re-enable the controller after PM. This is not * perfect - think about the case where we were doing * a clock change, and we suspended half-way through. */ if (old_state != C_DISABLE_PM) break; /* fall through */ case C_ENABLE: /* * Power up the LCD screen, enable controller, and * turn on the backlight. */ if (old_state != C_ENABLE) { fbi->state = C_ENABLE; pxafb_setup_gpio(fbi); pxafb_enable_controller(fbi); __pxafb_lcd_power(fbi, 1); __pxafb_backlight_power(fbi, 1); } break; } up(&fbi->ctrlr_sem); } /* * Our LCD controller task (which is called when we blank or unblank) * via keventd. */ static void pxafb_task(struct work_struct *work) { struct pxafb_info *fbi = container_of(work, struct pxafb_info, task); u_int state = xchg(&fbi->task_state, -1); set_ctrlr_state(fbi, state); } #ifdef CONFIG_CPU_FREQ /* * CPU clock speed change handler. We need to adjust the LCD timing * parameters when the CPU clock is adjusted by the power management * subsystem. * * TODO: Determine why f->new != 10*get_lclk_frequency_10khz() */ static int pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data) { struct pxafb_info *fbi = TO_INF(nb, freq_transition); /* TODO struct cpufreq_freqs *f = data; */ u_int pcd; switch (val) { case CPUFREQ_PRECHANGE: set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE); break; case CPUFREQ_POSTCHANGE: pcd = get_pcd(fbi, fbi->fb.var.pixclock); set_hsync_time(fbi, pcd); fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd); set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE); break; } return 0; } static int pxafb_freq_policy(struct notifier_block *nb, unsigned long val, void *data) { struct pxafb_info *fbi = TO_INF(nb, freq_policy); struct fb_var_screeninfo *var = &fbi->fb.var; struct cpufreq_policy *policy = data; switch (val) { case CPUFREQ_ADJUST: case CPUFREQ_INCOMPATIBLE: pr_debug("min dma period: %d ps, " "new clock %d kHz\n", pxafb_display_dma_period(var), policy->max); /* TODO: fill in min/max values */ break; } return 0; } #endif #ifdef CONFIG_PM /* * Power management hooks. Note that we won't be called from IRQ context, * unlike the blank functions above, so we may sleep. */ static int pxafb_suspend(struct platform_device *dev, pm_message_t state) { struct pxafb_info *fbi = platform_get_drvdata(dev); set_ctrlr_state(fbi, C_DISABLE_PM); return 0; } static int pxafb_resume(struct platform_device *dev) { struct pxafb_info *fbi = platform_get_drvdata(dev); set_ctrlr_state(fbi, C_ENABLE_PM); return 0; } #else #define pxafb_suspend NULL #define pxafb_resume NULL #endif /* * pxafb_map_video_memory(): * Allocates the DRAM memory for the frame buffer. This buffer is * remapped into a non-cached, non-buffered, memory region to * allow palette and pixel writes to occur without flushing the * cache. Once this area is remapped, all virtual memory * access to the video memory should occur at the new region. */ static int __init pxafb_map_video_memory(struct pxafb_info *fbi) { u_long palette_mem_size; /* * We reserve one page for the palette, plus the size * of the framebuffer. */ fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE); fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size, &fbi->map_dma, GFP_KERNEL); if (fbi->map_cpu) { /* prevent initial garbage on screen */ memset(fbi->map_cpu, 0, fbi->map_size); fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE; fbi->screen_dma = fbi->map_dma + PAGE_SIZE; /* * FIXME: this is actually the wrong thing to place in * smem_start. But fbdev suffers from the problem that * it needs an API which doesn't exist (in this case, * dma_writecombine_mmap) */ fbi->fb.fix.smem_start = fbi->screen_dma; fbi->palette_size = fbi->fb.var.bits_per_pixel == 8 ? 256 : 16; if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0) palette_mem_size = fbi->palette_size * sizeof(u16); else palette_mem_size = fbi->palette_size * sizeof(u32); fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size); fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size; } return fbi->map_cpu ? 0 : -ENOMEM; } static struct pxafb_info * __init pxafb_init_fbinfo(struct device *dev) { struct pxafb_info *fbi; void *addr; struct pxafb_mach_info *inf = dev->platform_data; struct pxafb_mode_info *mode = inf->modes; int i, smemlen; /* Alloc the pxafb_info and pseudo_palette in one step */ fbi = kmalloc(sizeof(struct pxafb_info) + sizeof(u32) * 16, GFP_KERNEL); if (!fbi) return NULL; memset(fbi, 0, sizeof(struct pxafb_info)); fbi->dev = dev; fbi->clk = clk_get(dev, "LCDCLK"); if (IS_ERR(fbi->clk)) { kfree(fbi); return NULL; } strcpy(fbi->fb.fix.id, PXA_NAME); fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS; fbi->fb.fix.type_aux = 0; fbi->fb.fix.xpanstep = 0; fbi->fb.fix.ypanstep = 0; fbi->fb.fix.ywrapstep = 0; fbi->fb.fix.accel = FB_ACCEL_NONE; fbi->fb.var.nonstd = 0; fbi->fb.var.activate = FB_ACTIVATE_NOW; fbi->fb.var.height = -1; fbi->fb.var.width = -1; fbi->fb.var.accel_flags = 0; fbi->fb.var.vmode = FB_VMODE_NONINTERLACED; fbi->fb.fbops = &pxafb_ops; fbi->fb.flags = FBINFO_DEFAULT; fbi->fb.node = -1; addr = fbi; addr = addr + sizeof(struct pxafb_info); fbi->fb.pseudo_palette = addr; pxafb_setmode(&fbi->fb.var, mode); fbi->cmap_inverse = inf->cmap_inverse; fbi->cmap_static = inf->cmap_static; fbi->lccr0 = inf->lccr0; fbi->lccr3 = inf->lccr3; fbi->lccr4 = inf->lccr4; fbi->state = C_STARTUP; fbi->task_state = (u_char)-1; for (i = 0; i < inf->num_modes; i++) { smemlen = mode[i].xres * mode[i].yres * mode[i].bpp / 8; if (smemlen > fbi->fb.fix.smem_len) fbi->fb.fix.smem_len = smemlen; } init_waitqueue_head(&fbi->ctrlr_wait); INIT_WORK(&fbi->task, pxafb_task); init_MUTEX(&fbi->ctrlr_sem); return fbi; } #ifdef CONFIG_FB_PXA_PARAMETERS static int __init parse_opt_mode(struct device *dev, const char *this_opt) { struct pxafb_mach_info *inf = dev->platform_data; const char *name = this_opt+5; unsigned int namelen = strlen(name); int res_specified = 0, bpp_specified = 0; unsigned int xres = 0, yres = 0, bpp = 0; int yres_specified = 0; int i; for (i = namelen-1; i >= 0; i--) { switch (name[i]) { case '-': namelen = i; if (!bpp_specified && !yres_specified) { bpp = simple_strtoul(&name[i+1], NULL, 0); bpp_specified = 1; } else goto done; break; case 'x': if (!yres_specified) { yres = simple_strtoul(&name[i+1], NULL, 0); yres_specified = 1; } else goto done; break; case '0' ... '9': break; default: goto done; } } if (i < 0 && yres_specified) { xres = simple_strtoul(name, NULL, 0); res_specified = 1; } done: if (res_specified) { dev_info(dev, "overriding resolution: %dx%d\n", xres, yres); inf->modes[0].xres = xres; inf->modes[0].yres = yres; } if (bpp_specified) switch (bpp) { case 1: case 2: case 4: case 8: case 16: inf->modes[0].bpp = bpp; dev_info(dev, "overriding bit depth: %d\n", bpp); break; default: dev_err(dev, "Depth %d is not valid\n", bpp); return -EINVAL; } return 0; } static int __init parse_opt(struct device *dev, char *this_opt) { struct pxafb_mach_info *inf = dev->platform_data; struct pxafb_mode_info *mode = &inf->modes[0]; char s[64]; s[0] = '\0'; if (!strncmp(this_opt, "mode:", 5)) { return parse_opt_mode(dev, this_opt); } else if (!strncmp(this_opt, "pixclock:", 9)) { mode->pixclock = simple_strtoul(this_opt+9, NULL, 0); sprintf(s, "pixclock: %ld\n", mode->pixclock); } else if (!strncmp(this_opt, "left:", 5)) { mode->left_margin = simple_strtoul(this_opt+5, NULL, 0); sprintf(s, "left: %u\n", mode->left_margin); } else if (!strncmp(this_opt, "right:", 6)) { mode->right_margin = simple_strtoul(this_opt+6, NULL, 0); sprintf(s, "right: %u\n", mode->right_margin); } else if (!strncmp(this_opt, "upper:", 6)) { mode->upper_margin = simple_strtoul(this_opt+6, NULL, 0); sprintf(s, "upper: %u\n", mode->upper_margin); } else if (!strncmp(this_opt, "lower:", 6)) { mode->lower_margin = simple_strtoul(this_opt+6, NULL, 0); sprintf(s, "lower: %u\n", mode->lower_margin); } else if (!strncmp(this_opt, "hsynclen:", 9)) { mode->hsync_len = simple_strtoul(this_opt+9, NULL, 0); sprintf(s, "hsynclen: %u\n", mode->hsync_len); } else if (!strncmp(this_opt, "vsynclen:", 9)) { mode->vsync_len = simple_strtoul(this_opt+9, NULL, 0); sprintf(s, "vsynclen: %u\n", mode->vsync_len); } else if (!strncmp(this_opt, "hsync:", 6)) { if (simple_strtoul(this_opt+6, NULL, 0) == 0) { sprintf(s, "hsync: Active Low\n"); mode->sync &= ~FB_SYNC_HOR_HIGH_ACT; } else { sprintf(s, "hsync: Active High\n"); mode->sync |= FB_SYNC_HOR_HIGH_ACT; } } else if (!strncmp(this_opt, "vsync:", 6)) { if (simple_strtoul(this_opt+6, NULL, 0) == 0) { sprintf(s, "vsync: Active Low\n"); mode->sync &= ~FB_SYNC_VERT_HIGH_ACT; } else { sprintf(s, "vsync: Active High\n"); mode->sync |= FB_SYNC_VERT_HIGH_ACT; } } else if (!strncmp(this_opt, "dpc:", 4)) { if (simple_strtoul(this_opt+4, NULL, 0) == 0) { sprintf(s, "double pixel clock: false\n"); inf->lccr3 &= ~LCCR3_DPC; } else { sprintf(s, "double pixel clock: true\n"); inf->lccr3 |= LCCR3_DPC; } } else if (!strncmp(this_opt, "outputen:", 9)) { if (simple_strtoul(this_opt+9, NULL, 0) == 0) { sprintf(s, "output enable: active low\n"); inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnL; } else { sprintf(s, "output enable: active high\n"); inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnH; } } else if (!strncmp(this_opt, "pixclockpol:", 12)) { if (simple_strtoul(this_opt+12, NULL, 0) == 0) { sprintf(s, "pixel clock polarity: falling edge\n"); inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixFlEdg; } else { sprintf(s, "pixel clock polarity: rising edge\n"); inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixRsEdg; } } else if (!strncmp(this_opt, "color", 5)) { inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Color; } else if (!strncmp(this_opt, "mono", 4)) { inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Mono; } else if (!strncmp(this_opt, "active", 6)) { inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Act; } else if (!strncmp(this_opt, "passive", 7)) { inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Pas; } else if (!strncmp(this_opt, "single", 6)) { inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Sngl; } else if (!strncmp(this_opt, "dual", 4)) { inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Dual; } else if (!strncmp(this_opt, "4pix", 4)) { inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_4PixMono; } else if (!strncmp(this_opt, "8pix", 4)) { inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_8PixMono; } else { dev_err(dev, "unknown option: %s\n", this_opt); return -EINVAL; } if (s[0] != '\0') dev_info(dev, "override %s", s); return 0; } static int __init pxafb_parse_options(struct device *dev, char *options) { char *this_opt; int ret; if (!options || !*options) return 0; dev_dbg(dev, "options are \"%s\"\n", options ? options : "null"); /* could be made table driven or similar?... */ while ((this_opt = strsep(&options, ",")) != NULL) { ret = parse_opt(dev, this_opt); if (ret) return ret; } return 0; } static char g_options[256] __devinitdata = ""; #ifndef CONFIG_MODULES static int __devinit pxafb_setup_options(void) { char *options = NULL; if (fb_get_options("pxafb", &options)) return -ENODEV; if (options) strlcpy(g_options, options, sizeof(g_options)); return 0; } #else #define pxafb_setup_options() (0) module_param_string(options, g_options, sizeof(g_options), 0); MODULE_PARM_DESC(options, "LCD parameters (see Documentation/fb/pxafb.txt)"); #endif #else #define pxafb_parse_options(...) (0) #define pxafb_setup_options() (0) #endif static int __init pxafb_probe(struct platform_device *dev) { struct pxafb_info *fbi; struct pxafb_mach_info *inf; int ret; dev_dbg(&dev->dev, "pxafb_probe\n"); inf = dev->dev.platform_data; ret = -ENOMEM; fbi = NULL; if (!inf) goto failed; ret = pxafb_parse_options(&dev->dev, g_options); if (ret < 0) goto failed; #ifdef DEBUG_VAR /* Check for various illegal bit-combinations. Currently only * a warning is given. */ if (inf->lccr0 & LCCR0_INVALID_CONFIG_MASK) dev_warn(&dev->dev, "machine LCCR0 setting contains " "illegal bits: %08x\n", inf->lccr0 & LCCR0_INVALID_CONFIG_MASK); if (inf->lccr3 & LCCR3_INVALID_CONFIG_MASK) dev_warn(&dev->dev, "machine LCCR3 setting contains " "illegal bits: %08x\n", inf->lccr3 & LCCR3_INVALID_CONFIG_MASK); if (inf->lccr0 & LCCR0_DPD && ((inf->lccr0 & LCCR0_PAS) != LCCR0_Pas || (inf->lccr0 & LCCR0_SDS) != LCCR0_Sngl || (inf->lccr0 & LCCR0_CMS) != LCCR0_Mono)) dev_warn(&dev->dev, "Double Pixel Data (DPD) mode is " "only valid in passive mono" " single panel mode\n"); if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Act && (inf->lccr0 & LCCR0_SDS) == LCCR0_Dual) dev_warn(&dev->dev, "Dual panel only valid in passive mode\n"); if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Pas && (inf->modes->upper_margin || inf->modes->lower_margin)) dev_warn(&dev->dev, "Upper and lower margins must be 0 in " "passive mode\n"); #endif dev_dbg(&dev->dev, "got a %dx%dx%d LCD\n", inf->modes->xres, inf->modes->yres, inf->modes->bpp); if (inf->modes->xres == 0 || inf->modes->yres == 0 || inf->modes->bpp == 0) { dev_err(&dev->dev, "Invalid resolution or bit depth\n"); ret = -EINVAL; goto failed; } pxafb_backlight_power = inf->pxafb_backlight_power; pxafb_lcd_power = inf->pxafb_lcd_power; fbi = pxafb_init_fbinfo(&dev->dev); if (!fbi) { /* only reason for pxafb_init_fbinfo to fail is kmalloc */ dev_err(&dev->dev, "Failed to initialize framebuffer device\n"); ret = -ENOMEM; goto failed; } /* Initialize video memory */ ret = pxafb_map_video_memory(fbi); if (ret) { dev_err(&dev->dev, "Failed to allocate video RAM: %d\n", ret); ret = -ENOMEM; goto failed; } ret = request_irq(IRQ_LCD, pxafb_handle_irq, IRQF_DISABLED, "LCD", fbi); if (ret) { dev_err(&dev->dev, "request_irq failed: %d\n", ret); ret = -EBUSY; goto failed; } /* * This makes sure that our colour bitfield * descriptors are correctly initialised. */ pxafb_check_var(&fbi->fb.var, &fbi->fb); pxafb_set_par(&fbi->fb); platform_set_drvdata(dev, fbi); ret = register_framebuffer(&fbi->fb); if (ret < 0) { dev_err(&dev->dev, "Failed to register framebuffer device: %d\n", ret); goto failed; } #ifdef CONFIG_CPU_FREQ fbi->freq_transition.notifier_call = pxafb_freq_transition; fbi->freq_policy.notifier_call = pxafb_freq_policy; cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER); cpufreq_register_notifier(&fbi->freq_policy, CPUFREQ_POLICY_NOTIFIER); #endif /* * Ok, now enable the LCD controller */ set_ctrlr_state(fbi, C_ENABLE); return 0; failed: platform_set_drvdata(dev, NULL); kfree(fbi); return ret; } static struct platform_driver pxafb_driver = { .probe = pxafb_probe, .suspend = pxafb_suspend, .resume = pxafb_resume, .driver = { .name = "pxa2xx-fb", }, }; static int __devinit pxafb_init(void) { if (pxafb_setup_options()) return -EINVAL; return platform_driver_register(&pxafb_driver); } module_init(pxafb_init); MODULE_DESCRIPTION("loadable framebuffer driver for PXA"); MODULE_LICENSE("GPL");