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Diffstat (limited to '')
| -rw-r--r-- | drivers/video/fbdev/68328fb.c | 482 |
1 files changed, 482 insertions, 0 deletions
diff --git a/drivers/video/fbdev/68328fb.c b/drivers/video/fbdev/68328fb.c new file mode 100644 index 000000000..7db03ed77 --- /dev/null +++ b/drivers/video/fbdev/68328fb.c @@ -0,0 +1,482 @@ +/* + * linux/drivers/video/68328fb.c -- Low level implementation of the + * mc68x328 LCD frame buffer device + * + * Copyright (C) 2003 Georges Menie + * + * This driver assumes an already configured controller (e.g. from config.c) + * Keep the code clean of board specific initialization. + * + * This code has not been tested with colors, colormap management functions + * are minimal (no colormap data written to the 68328 registers...) + * + * initial version of this driver: + * Copyright (C) 1998,1999 Kenneth Albanowski <kjahds@kjahds.com>, + * The Silver Hammer Group, Ltd. + * + * this version is based on : + * + * linux/drivers/video/vfb.c -- Virtual frame buffer device + * + * Copyright (C) 2002 James Simmons + * + * Copyright (C) 1997 Geert Uytterhoeven + * + * 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. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/vmalloc.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/uaccess.h> +#include <linux/fb.h> +#include <linux/init.h> + +#if defined(CONFIG_M68VZ328) +#include <asm/MC68VZ328.h> +#elif defined(CONFIG_M68EZ328) +#include <asm/MC68EZ328.h> +#elif defined(CONFIG_M68328) +#include <asm/MC68328.h> +#else +#error wrong architecture for the MC68x328 frame buffer device +#endif + +static u_long videomemory; +static u_long videomemorysize; + +static struct fb_info fb_info; +static u32 mc68x328fb_pseudo_palette[16]; + +static struct fb_var_screeninfo mc68x328fb_default __initdata = { + .red = { 0, 8, 0 }, + .green = { 0, 8, 0 }, + .blue = { 0, 8, 0 }, + .activate = FB_ACTIVATE_TEST, + .height = -1, + .width = -1, + .pixclock = 20000, + .left_margin = 64, + .right_margin = 64, + .upper_margin = 32, + .lower_margin = 32, + .hsync_len = 64, + .vsync_len = 2, + .vmode = FB_VMODE_NONINTERLACED, +}; + +static const struct fb_fix_screeninfo mc68x328fb_fix __initconst = { + .id = "68328fb", + .type = FB_TYPE_PACKED_PIXELS, + .xpanstep = 1, + .ypanstep = 1, + .ywrapstep = 1, + .accel = FB_ACCEL_NONE, +}; + + /* + * Interface used by the world + */ +static int mc68x328fb_check_var(struct fb_var_screeninfo *var, + struct fb_info *info); +static int mc68x328fb_set_par(struct fb_info *info); +static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, + u_int transp, struct fb_info *info); +static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, + struct fb_info *info); +static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma); + +static const struct fb_ops mc68x328fb_ops = { + .fb_check_var = mc68x328fb_check_var, + .fb_set_par = mc68x328fb_set_par, + .fb_setcolreg = mc68x328fb_setcolreg, + .fb_pan_display = mc68x328fb_pan_display, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, + .fb_mmap = mc68x328fb_mmap, +}; + + /* + * Internal routines + */ + +static u_long get_line_length(int xres_virtual, int bpp) +{ + u_long length; + + length = xres_virtual * bpp; + length = (length + 31) & ~31; + length >>= 3; + return (length); +} + + /* + * Setting the video mode has been split into two parts. + * First part, xxxfb_check_var, must not write anything + * to hardware, it should only verify and adjust var. + * This means it doesn't alter par but it does use hardware + * data from it to check this var. + */ + +static int mc68x328fb_check_var(struct fb_var_screeninfo *var, + struct fb_info *info) +{ + u_long line_length; + + /* + * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal! + * as FB_VMODE_SMOOTH_XPAN is only used internally + */ + + if (var->vmode & FB_VMODE_CONUPDATE) { + var->vmode |= FB_VMODE_YWRAP; + var->xoffset = info->var.xoffset; + var->yoffset = info->var.yoffset; + } + + /* + * Some very basic checks + */ + if (!var->xres) + var->xres = 1; + if (!var->yres) + var->yres = 1; + if (var->xres > var->xres_virtual) + var->xres_virtual = var->xres; + if (var->yres > var->yres_virtual) + var->yres_virtual = var->yres; + if (var->bits_per_pixel <= 1) + var->bits_per_pixel = 1; + else if (var->bits_per_pixel <= 8) + var->bits_per_pixel = 8; + else if (var->bits_per_pixel <= 16) + var->bits_per_pixel = 16; + else if (var->bits_per_pixel <= 24) + var->bits_per_pixel = 24; + else if (var->bits_per_pixel <= 32) + var->bits_per_pixel = 32; + else + return -EINVAL; + + if (var->xres_virtual < var->xoffset + var->xres) + var->xres_virtual = var->xoffset + var->xres; + if (var->yres_virtual < var->yoffset + var->yres) + var->yres_virtual = var->yoffset + var->yres; + + /* + * Memory limit + */ + line_length = + get_line_length(var->xres_virtual, var->bits_per_pixel); + if (line_length * var->yres_virtual > videomemorysize) + return -ENOMEM; + + /* + * Now that we checked it we alter var. The reason being is that the video + * mode passed in might not work but slight changes to it might make it + * work. This way we let the user know what is acceptable. + */ + switch (var->bits_per_pixel) { + case 1: + var->red.offset = 0; + var->red.length = 1; + var->green.offset = 0; + var->green.length = 1; + var->blue.offset = 0; + var->blue.length = 1; + var->transp.offset = 0; + var->transp.length = 0; + break; + case 8: + var->red.offset = 0; + var->red.length = 8; + var->green.offset = 0; + var->green.length = 8; + var->blue.offset = 0; + var->blue.length = 8; + var->transp.offset = 0; + var->transp.length = 0; + break; + case 16: /* RGBA 5551 */ + if (var->transp.length) { + var->red.offset = 0; + var->red.length = 5; + var->green.offset = 5; + var->green.length = 5; + var->blue.offset = 10; + var->blue.length = 5; + var->transp.offset = 15; + var->transp.length = 1; + } else { /* RGB 565 */ + var->red.offset = 0; + var->red.length = 5; + var->green.offset = 5; + var->green.length = 6; + var->blue.offset = 11; + var->blue.length = 5; + var->transp.offset = 0; + var->transp.length = 0; + } + break; + case 24: /* RGB 888 */ + var->red.offset = 0; + var->red.length = 8; + var->green.offset = 8; + var->green.length = 8; + var->blue.offset = 16; + var->blue.length = 8; + var->transp.offset = 0; + var->transp.length = 0; + break; + case 32: /* RGBA 8888 */ + var->red.offset = 0; + var->red.length = 8; + var->green.offset = 8; + var->green.length = 8; + var->blue.offset = 16; + var->blue.length = 8; + var->transp.offset = 24; + var->transp.length = 8; + break; + } + var->red.msb_right = 0; + var->green.msb_right = 0; + var->blue.msb_right = 0; + var->transp.msb_right = 0; + + return 0; +} + +/* This routine actually sets the video mode. It's in here where we + * the hardware state info->par and fix which can be affected by the + * change in par. For this driver it doesn't do much. + */ +static int mc68x328fb_set_par(struct fb_info *info) +{ + info->fix.line_length = get_line_length(info->var.xres_virtual, + info->var.bits_per_pixel); + return 0; +} + + /* + * Set a single color register. The values supplied are already + * rounded down to the hardware's capabilities (according to the + * entries in the var structure). Return != 0 for invalid regno. + */ + +static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, + u_int transp, struct fb_info *info) +{ + if (regno >= 256) /* no. of hw registers */ + return 1; + /* + * Program hardware... do anything you want with transp + */ + + /* grayscale works only partially under directcolor */ + if (info->var.grayscale) { + /* grayscale = 0.30*R + 0.59*G + 0.11*B */ + red = green = blue = + (red * 77 + green * 151 + blue * 28) >> 8; + } + + /* Directcolor: + * var->{color}.offset contains start of bitfield + * var->{color}.length contains length of bitfield + * {hardwarespecific} contains width of RAMDAC + * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset) + * RAMDAC[X] is programmed to (red, green, blue) + * + * Pseudocolor: + * uses offset = 0 && length = RAMDAC register width. + * var->{color}.offset is 0 + * var->{color}.length contains width of DAC + * cmap is not used + * RAMDAC[X] is programmed to (red, green, blue) + * Truecolor: + * does not use DAC. Usually 3 are present. + * var->{color}.offset contains start of bitfield + * var->{color}.length contains length of bitfield + * cmap is programmed to (red << red.offset) | (green << green.offset) | + * (blue << blue.offset) | (transp << transp.offset) + * RAMDAC does not exist + */ +#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) + switch (info->fix.visual) { + case FB_VISUAL_TRUECOLOR: + case FB_VISUAL_PSEUDOCOLOR: + red = CNVT_TOHW(red, info->var.red.length); + green = CNVT_TOHW(green, info->var.green.length); + blue = CNVT_TOHW(blue, info->var.blue.length); + transp = CNVT_TOHW(transp, info->var.transp.length); + break; + case FB_VISUAL_DIRECTCOLOR: + red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */ + green = CNVT_TOHW(green, 8); + blue = CNVT_TOHW(blue, 8); + /* hey, there is bug in transp handling... */ + transp = CNVT_TOHW(transp, 8); + break; + } +#undef CNVT_TOHW + /* Truecolor has hardware independent palette */ + if (info->fix.visual == FB_VISUAL_TRUECOLOR) { + u32 v; + + if (regno >= 16) + return 1; + + v = (red << info->var.red.offset) | + (green << info->var.green.offset) | + (blue << info->var.blue.offset) | + (transp << info->var.transp.offset); + switch (info->var.bits_per_pixel) { + case 8: + break; + case 16: + ((u32 *) (info->pseudo_palette))[regno] = v; + break; + case 24: + case 32: + ((u32 *) (info->pseudo_palette))[regno] = v; + break; + } + return 0; + } + return 0; +} + + /* + * Pan or Wrap the Display + * + * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag + */ + +static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, + struct fb_info *info) +{ + if (var->vmode & FB_VMODE_YWRAP) { + if (var->yoffset < 0 + || var->yoffset >= info->var.yres_virtual + || var->xoffset) + return -EINVAL; + } else { + if (var->xoffset + info->var.xres > info->var.xres_virtual || + var->yoffset + info->var.yres > info->var.yres_virtual) + return -EINVAL; + } + info->var.xoffset = var->xoffset; + info->var.yoffset = var->yoffset; + if (var->vmode & FB_VMODE_YWRAP) + info->var.vmode |= FB_VMODE_YWRAP; + else + info->var.vmode &= ~FB_VMODE_YWRAP; + return 0; +} + + /* + * Most drivers don't need their own mmap function + */ + +static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ +#ifndef MMU + /* this is uClinux (no MMU) specific code */ + + vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; + vma->vm_start = videomemory; + + return 0; +#else + return -EINVAL; +#endif +} + +static int __init mc68x328fb_setup(char *options) +{ + if (!options || !*options) + return 1; + return 1; +} + + /* + * Initialisation + */ + +static int __init mc68x328fb_init(void) +{ +#ifndef MODULE + char *option = NULL; + + if (fb_get_options("68328fb", &option)) + return -ENODEV; + mc68x328fb_setup(option); +#endif + /* + * initialize the default mode from the LCD controller registers + */ + mc68x328fb_default.xres = LXMAX; + mc68x328fb_default.yres = LYMAX+1; + mc68x328fb_default.xres_virtual = mc68x328fb_default.xres; + mc68x328fb_default.yres_virtual = mc68x328fb_default.yres; + mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01); + videomemory = LSSA; + videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 * + mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel; + + fb_info.screen_base = (void *)videomemory; + fb_info.fbops = &mc68x328fb_ops; + fb_info.var = mc68x328fb_default; + fb_info.fix = mc68x328fb_fix; + fb_info.fix.smem_start = videomemory; + fb_info.fix.smem_len = videomemorysize; + fb_info.fix.line_length = + get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel); + fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ? + FB_VISUAL_MONO10 : FB_VISUAL_PSEUDOCOLOR; + if (fb_info.var.bits_per_pixel == 1) { + fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1; + fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0; + } + fb_info.pseudo_palette = &mc68x328fb_pseudo_palette; + fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN; + + if (fb_alloc_cmap(&fb_info.cmap, 256, 0)) + return -ENOMEM; + + if (register_framebuffer(&fb_info) < 0) { + fb_dealloc_cmap(&fb_info.cmap); + return -EINVAL; + } + + fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id); + fb_info(&fb_info, "%dx%dx%d at 0x%08lx\n", + mc68x328fb_default.xres_virtual, + mc68x328fb_default.yres_virtual, + 1 << mc68x328fb_default.bits_per_pixel, videomemory); + + return 0; +} + +module_init(mc68x328fb_init); + +#ifdef MODULE + +static void __exit mc68x328fb_cleanup(void) +{ + unregister_framebuffer(&fb_info); + fb_dealloc_cmap(&fb_info.cmap); +} + +module_exit(mc68x328fb_cleanup); + +MODULE_LICENSE("GPL"); +#endif /* MODULE */ |