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485 lines
13 KiB
485 lines
13 KiB
/* |
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* linux/drivers/video/68328fb.c -- Low level implementation of the |
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* mc68x328 LCD frame buffer device |
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* |
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* Copyright (C) 2003 Georges Menie |
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* |
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* This driver assumes an already configured controller (e.g. from config.c) |
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* Keep the code clean of board specific initialization. |
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* |
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* This code has not been tested with colors, colormap management functions |
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* are minimal (no colormap data written to the 68328 registers...) |
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* |
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* initial version of this driver: |
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* Copyright (C) 1998,1999 Kenneth Albanowski <[email protected]>, |
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* The Silver Hammer Group, Ltd. |
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* |
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* this version is based on : |
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* |
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* linux/drivers/video/vfb.c -- Virtual frame buffer device |
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* |
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* Copyright (C) 2002 James Simmons |
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* |
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* Copyright (C) 1997 Geert Uytterhoeven |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive for |
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* more details. |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/string.h> |
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#include <linux/mm.h> |
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#include <linux/vmalloc.h> |
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#include <linux/delay.h> |
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#include <linux/interrupt.h> |
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#include <linux/uaccess.h> |
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#include <linux/fb.h> |
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#include <linux/init.h> |
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#if defined(CONFIG_M68VZ328) |
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#include <asm/MC68VZ328.h> |
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#elif defined(CONFIG_M68EZ328) |
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#include <asm/MC68EZ328.h> |
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#elif defined(CONFIG_M68328) |
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#include <asm/MC68328.h> |
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#else |
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#error wrong architecture for the MC68x328 frame buffer device |
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#endif |
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static u_long videomemory; |
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static u_long videomemorysize; |
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static struct fb_info fb_info; |
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static u32 mc68x328fb_pseudo_palette[16]; |
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static struct fb_var_screeninfo mc68x328fb_default __initdata = { |
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.red = { 0, 8, 0 }, |
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.green = { 0, 8, 0 }, |
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.blue = { 0, 8, 0 }, |
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.activate = FB_ACTIVATE_TEST, |
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.height = -1, |
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.width = -1, |
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.pixclock = 20000, |
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.left_margin = 64, |
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.right_margin = 64, |
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.upper_margin = 32, |
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.lower_margin = 32, |
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.hsync_len = 64, |
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.vsync_len = 2, |
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.vmode = FB_VMODE_NONINTERLACED, |
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}; |
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static const struct fb_fix_screeninfo mc68x328fb_fix __initconst = { |
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.id = "68328fb", |
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.type = FB_TYPE_PACKED_PIXELS, |
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.xpanstep = 1, |
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.ypanstep = 1, |
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.ywrapstep = 1, |
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.accel = FB_ACCEL_NONE, |
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}; |
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/* |
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* Interface used by the world |
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*/ |
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int mc68x328fb_init(void); |
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int mc68x328fb_setup(char *); |
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static int mc68x328fb_check_var(struct fb_var_screeninfo *var, |
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struct fb_info *info); |
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static int mc68x328fb_set_par(struct fb_info *info); |
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static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, |
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u_int transp, struct fb_info *info); |
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static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, |
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struct fb_info *info); |
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static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma); |
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static const struct fb_ops mc68x328fb_ops = { |
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.fb_check_var = mc68x328fb_check_var, |
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.fb_set_par = mc68x328fb_set_par, |
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.fb_setcolreg = mc68x328fb_setcolreg, |
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.fb_pan_display = mc68x328fb_pan_display, |
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.fb_fillrect = cfb_fillrect, |
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.fb_copyarea = cfb_copyarea, |
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.fb_imageblit = cfb_imageblit, |
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.fb_mmap = mc68x328fb_mmap, |
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}; |
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/* |
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* Internal routines |
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*/ |
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static u_long get_line_length(int xres_virtual, int bpp) |
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{ |
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u_long length; |
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length = xres_virtual * bpp; |
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length = (length + 31) & ~31; |
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length >>= 3; |
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return (length); |
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} |
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/* |
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* Setting the video mode has been split into two parts. |
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* First part, xxxfb_check_var, must not write anything |
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* to hardware, it should only verify and adjust var. |
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* This means it doesn't alter par but it does use hardware |
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* data from it to check this var. |
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*/ |
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static int mc68x328fb_check_var(struct fb_var_screeninfo *var, |
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struct fb_info *info) |
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{ |
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u_long line_length; |
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/* |
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* FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal! |
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* as FB_VMODE_SMOOTH_XPAN is only used internally |
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*/ |
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if (var->vmode & FB_VMODE_CONUPDATE) { |
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var->vmode |= FB_VMODE_YWRAP; |
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var->xoffset = info->var.xoffset; |
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var->yoffset = info->var.yoffset; |
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} |
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/* |
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* Some very basic checks |
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*/ |
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if (!var->xres) |
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var->xres = 1; |
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if (!var->yres) |
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var->yres = 1; |
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if (var->xres > var->xres_virtual) |
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var->xres_virtual = var->xres; |
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if (var->yres > var->yres_virtual) |
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var->yres_virtual = var->yres; |
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if (var->bits_per_pixel <= 1) |
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var->bits_per_pixel = 1; |
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else if (var->bits_per_pixel <= 8) |
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var->bits_per_pixel = 8; |
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else if (var->bits_per_pixel <= 16) |
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var->bits_per_pixel = 16; |
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else if (var->bits_per_pixel <= 24) |
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var->bits_per_pixel = 24; |
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else if (var->bits_per_pixel <= 32) |
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var->bits_per_pixel = 32; |
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else |
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return -EINVAL; |
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if (var->xres_virtual < var->xoffset + var->xres) |
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var->xres_virtual = var->xoffset + var->xres; |
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if (var->yres_virtual < var->yoffset + var->yres) |
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var->yres_virtual = var->yoffset + var->yres; |
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/* |
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* Memory limit |
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*/ |
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line_length = |
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get_line_length(var->xres_virtual, var->bits_per_pixel); |
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if (line_length * var->yres_virtual > videomemorysize) |
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return -ENOMEM; |
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/* |
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* Now that we checked it we alter var. The reason being is that the video |
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* mode passed in might not work but slight changes to it might make it |
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* work. This way we let the user know what is acceptable. |
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*/ |
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switch (var->bits_per_pixel) { |
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case 1: |
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var->red.offset = 0; |
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var->red.length = 1; |
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var->green.offset = 0; |
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var->green.length = 1; |
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var->blue.offset = 0; |
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var->blue.length = 1; |
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var->transp.offset = 0; |
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var->transp.length = 0; |
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break; |
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case 8: |
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var->red.offset = 0; |
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var->red.length = 8; |
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var->green.offset = 0; |
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var->green.length = 8; |
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var->blue.offset = 0; |
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var->blue.length = 8; |
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var->transp.offset = 0; |
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var->transp.length = 0; |
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break; |
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case 16: /* RGBA 5551 */ |
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if (var->transp.length) { |
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var->red.offset = 0; |
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var->red.length = 5; |
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var->green.offset = 5; |
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var->green.length = 5; |
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var->blue.offset = 10; |
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var->blue.length = 5; |
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var->transp.offset = 15; |
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var->transp.length = 1; |
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} else { /* RGB 565 */ |
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var->red.offset = 0; |
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var->red.length = 5; |
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var->green.offset = 5; |
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var->green.length = 6; |
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var->blue.offset = 11; |
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var->blue.length = 5; |
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var->transp.offset = 0; |
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var->transp.length = 0; |
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} |
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break; |
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case 24: /* RGB 888 */ |
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var->red.offset = 0; |
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var->red.length = 8; |
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var->green.offset = 8; |
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var->green.length = 8; |
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var->blue.offset = 16; |
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var->blue.length = 8; |
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var->transp.offset = 0; |
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var->transp.length = 0; |
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break; |
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case 32: /* RGBA 8888 */ |
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var->red.offset = 0; |
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var->red.length = 8; |
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var->green.offset = 8; |
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var->green.length = 8; |
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var->blue.offset = 16; |
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var->blue.length = 8; |
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var->transp.offset = 24; |
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var->transp.length = 8; |
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break; |
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} |
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var->red.msb_right = 0; |
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var->green.msb_right = 0; |
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var->blue.msb_right = 0; |
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var->transp.msb_right = 0; |
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return 0; |
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} |
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/* This routine actually sets the video mode. It's in here where we |
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* the hardware state info->par and fix which can be affected by the |
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* change in par. For this driver it doesn't do much. |
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*/ |
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static int mc68x328fb_set_par(struct fb_info *info) |
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{ |
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info->fix.line_length = get_line_length(info->var.xres_virtual, |
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info->var.bits_per_pixel); |
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return 0; |
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} |
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/* |
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* Set a single color register. The values supplied are already |
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* rounded down to the hardware's capabilities (according to the |
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* entries in the var structure). Return != 0 for invalid regno. |
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*/ |
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static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, |
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u_int transp, struct fb_info *info) |
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{ |
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if (regno >= 256) /* no. of hw registers */ |
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return 1; |
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/* |
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* Program hardware... do anything you want with transp |
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*/ |
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/* grayscale works only partially under directcolor */ |
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if (info->var.grayscale) { |
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/* grayscale = 0.30*R + 0.59*G + 0.11*B */ |
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red = green = blue = |
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(red * 77 + green * 151 + blue * 28) >> 8; |
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} |
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/* Directcolor: |
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* var->{color}.offset contains start of bitfield |
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* var->{color}.length contains length of bitfield |
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* {hardwarespecific} contains width of RAMDAC |
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* cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset) |
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* RAMDAC[X] is programmed to (red, green, blue) |
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* |
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* Pseudocolor: |
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* uses offset = 0 && length = RAMDAC register width. |
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* var->{color}.offset is 0 |
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* var->{color}.length contains width of DAC |
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* cmap is not used |
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* RAMDAC[X] is programmed to (red, green, blue) |
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* Truecolor: |
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* does not use DAC. Usually 3 are present. |
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* var->{color}.offset contains start of bitfield |
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* var->{color}.length contains length of bitfield |
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* cmap is programmed to (red << red.offset) | (green << green.offset) | |
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* (blue << blue.offset) | (transp << transp.offset) |
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* RAMDAC does not exist |
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*/ |
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#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) |
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switch (info->fix.visual) { |
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case FB_VISUAL_TRUECOLOR: |
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case FB_VISUAL_PSEUDOCOLOR: |
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red = CNVT_TOHW(red, info->var.red.length); |
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green = CNVT_TOHW(green, info->var.green.length); |
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blue = CNVT_TOHW(blue, info->var.blue.length); |
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transp = CNVT_TOHW(transp, info->var.transp.length); |
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break; |
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case FB_VISUAL_DIRECTCOLOR: |
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red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */ |
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green = CNVT_TOHW(green, 8); |
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blue = CNVT_TOHW(blue, 8); |
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/* hey, there is bug in transp handling... */ |
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transp = CNVT_TOHW(transp, 8); |
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break; |
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} |
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#undef CNVT_TOHW |
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/* Truecolor has hardware independent palette */ |
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if (info->fix.visual == FB_VISUAL_TRUECOLOR) { |
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u32 v; |
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if (regno >= 16) |
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return 1; |
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v = (red << info->var.red.offset) | |
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(green << info->var.green.offset) | |
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(blue << info->var.blue.offset) | |
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(transp << info->var.transp.offset); |
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switch (info->var.bits_per_pixel) { |
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case 8: |
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break; |
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case 16: |
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((u32 *) (info->pseudo_palette))[regno] = v; |
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break; |
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case 24: |
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case 32: |
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((u32 *) (info->pseudo_palette))[regno] = v; |
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break; |
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} |
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return 0; |
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} |
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return 0; |
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} |
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/* |
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* Pan or Wrap the Display |
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* |
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* This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag |
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*/ |
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static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, |
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struct fb_info *info) |
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{ |
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if (var->vmode & FB_VMODE_YWRAP) { |
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if (var->yoffset < 0 |
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|| var->yoffset >= info->var.yres_virtual |
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|| var->xoffset) |
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return -EINVAL; |
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} else { |
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if (var->xoffset + info->var.xres > info->var.xres_virtual || |
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var->yoffset + info->var.yres > info->var.yres_virtual) |
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return -EINVAL; |
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} |
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info->var.xoffset = var->xoffset; |
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info->var.yoffset = var->yoffset; |
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if (var->vmode & FB_VMODE_YWRAP) |
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info->var.vmode |= FB_VMODE_YWRAP; |
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else |
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info->var.vmode &= ~FB_VMODE_YWRAP; |
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return 0; |
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} |
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/* |
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* Most drivers don't need their own mmap function |
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*/ |
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static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma) |
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{ |
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#ifndef MMU |
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/* this is uClinux (no MMU) specific code */ |
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vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
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vma->vm_start = videomemory; |
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return 0; |
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#else |
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return -EINVAL; |
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#endif |
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} |
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int __init mc68x328fb_setup(char *options) |
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{ |
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if (!options || !*options) |
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return 1; |
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return 1; |
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} |
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/* |
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* Initialisation |
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*/ |
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int __init mc68x328fb_init(void) |
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{ |
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#ifndef MODULE |
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char *option = NULL; |
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if (fb_get_options("68328fb", &option)) |
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return -ENODEV; |
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mc68x328fb_setup(option); |
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#endif |
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/* |
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* initialize the default mode from the LCD controller registers |
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*/ |
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mc68x328fb_default.xres = LXMAX; |
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mc68x328fb_default.yres = LYMAX+1; |
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mc68x328fb_default.xres_virtual = mc68x328fb_default.xres; |
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mc68x328fb_default.yres_virtual = mc68x328fb_default.yres; |
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mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01); |
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videomemory = LSSA; |
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videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 * |
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mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel; |
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fb_info.screen_base = (void *)videomemory; |
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fb_info.fbops = &mc68x328fb_ops; |
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fb_info.var = mc68x328fb_default; |
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fb_info.fix = mc68x328fb_fix; |
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fb_info.fix.smem_start = videomemory; |
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fb_info.fix.smem_len = videomemorysize; |
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fb_info.fix.line_length = |
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get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel); |
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fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ? |
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FB_VISUAL_MONO10 : FB_VISUAL_PSEUDOCOLOR; |
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if (fb_info.var.bits_per_pixel == 1) { |
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fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1; |
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fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0; |
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} |
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fb_info.pseudo_palette = &mc68x328fb_pseudo_palette; |
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fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN; |
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if (fb_alloc_cmap(&fb_info.cmap, 256, 0)) |
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return -ENOMEM; |
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if (register_framebuffer(&fb_info) < 0) { |
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fb_dealloc_cmap(&fb_info.cmap); |
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return -EINVAL; |
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} |
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fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id); |
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fb_info(&fb_info, "%dx%dx%d at 0x%08lx\n", |
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mc68x328fb_default.xres_virtual, |
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mc68x328fb_default.yres_virtual, |
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1 << mc68x328fb_default.bits_per_pixel, videomemory); |
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return 0; |
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} |
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module_init(mc68x328fb_init); |
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#ifdef MODULE |
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static void __exit mc68x328fb_cleanup(void) |
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{ |
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unregister_framebuffer(&fb_info); |
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fb_dealloc_cmap(&fb_info.cmap); |
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} |
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module_exit(mc68x328fb_cleanup); |
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MODULE_LICENSE("GPL"); |
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#endif /* MODULE */
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