--- /dev/null
+/*
+ * 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 <asm/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 struct fb_fix_screeninfo mc68x328fb_fix __initdata = {
+ .id = "68328fb",
+ .type = FB_TYPE_PACKED_PIXELS,
+ .xpanstep = 1,
+ .ypanstep = 1,
+ .ywrapstep = 1,
+ .accel = FB_ACCEL_NONE,
+};
+
+ /*
+ * Interface used by the world
+ */
+int mc68x328fb_init(void);
+int mc68x328fb_setup(char *);
+
+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 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
+}
+
+int __init mc68x328fb_setup(char *options)
+{
+#if 0
+ char *this_opt;
+#endif
+
+ if (!options || !*options)
+ return 1;
+#if 0
+ while ((this_opt = strsep(&options, ",")) != NULL) {
+ if (!*this_opt)
+ continue;
+ if (!strncmp(this_opt, "disable", 7))
+ mc68x328fb_enable = 0;
+ }
+#endif
+ return 1;
+}
+
+ /*
+ * Initialisation
+ */
+
+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 */
Code Review / kvmfornfv.git / blobdiff