--- /dev/null
+/*
+ * linux/drivers/video/x68kfb.c -- X68000 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/platform_device.h>
+
+#include <linux/fb.h>
+#include <linux/init.h>
+#include "core/fb_draw.h"
+
+ /*
+ * RAM we reserve for the frame buffer. This defines the maximum screen
+ * size
+ *
+ * The default can be overridden if the driver is compiled as a module
+ */
+
+#define VIDEOMEMSIZE (2*1024*1024) /* 2 MB */
+
+static void *videomemory;
+static u_long videomemorysize = VIDEOMEMSIZE;
+
+static struct fb_var_screeninfo x68kfb_default = {
+ .xres = 768,
+ .yres = 512,
+ .xres_virtual = 1024,
+ .yres_virtual = 1024,
+ .bits_per_pixel = 16,
+ .red = { 6, 5, 0 },
+ .green = { 11, 5, 0 },
+ .blue = { 1, 5, 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 x68kfb_fix = {
+ .id = "X68k FB",
+ .type = FB_TYPE_PACKED_PIXELS,
+ .visual = FB_VISUAL_PSEUDOCOLOR,
+ .xpanstep = 1,
+ .ypanstep = 1,
+ .ywrapstep = 1,
+ .accel = FB_ACCEL_NONE,
+};
+
+static bool x68kfb_enable __initdata = 0; /* disabled by default */
+module_param(x68kfb_enable, bool, 0);
+
+static int x68kfb_check_var(struct fb_var_screeninfo *var,
+ struct fb_info *info);
+static int x68kfb_set_par(struct fb_info *info);
+static int x68kfb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info);
+static int x68kfb_mmap(struct fb_info *info,
+ struct vm_area_struct *vma);
+static int x68kfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int transp, struct fb_info *info);
+static void x68kfb_imageblit(struct fb_info *p, const struct fb_image *image);
+
+static struct fb_ops x68kfb_ops = {
+ .fb_check_var = x68kfb_check_var,
+ .fb_set_par = x68kfb_set_par,
+ .fb_pan_display = x68kfb_pan_display,
+ .fb_setcolreg = x68kfb_setcolreg,
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = x68kfb_imageblit,
+ .fb_mmap = x68kfb_mmap,
+};
+
+ /*
+ * Internal routines
+ */
+
+static u_long get_line_length(int xres_virtual, int bpp)
+{
+ u_long length;
+
+ length = xres_virtual * bpp / 8;
+ 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 x68kfb_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);
+ printk("line_length = %d %d %d\n", 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.
+ */
+ 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 = 1;
+ 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 x68kfb_set_par(struct fb_info *info)
+{
+ info->fix.line_length = get_line_length(info->var.xres_virtual,
+ info->var.bits_per_pixel);
+ return 0;
+}
+
+static int x68kfb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ if (var->vmode & FB_VMODE_YWRAP) {
+ if (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 x68kfb_mmap(struct fb_info *info,
+ struct vm_area_struct *vma)
+{
+ unsigned long start = vma->vm_start;
+ unsigned long size = vma->vm_end - vma->vm_start;
+ unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+ unsigned long page, pos;
+
+ if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
+ return -EINVAL;
+ if (size > info->fix.smem_len)
+ return -EINVAL;
+ if (offset > info->fix.smem_len - size)
+ return -EINVAL;
+
+ pos = (unsigned long)info->fix.smem_start + offset;
+
+ while (size > 0) {
+ page = vmalloc_to_pfn((void *)pos);
+ if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) {
+ return -EAGAIN;
+ }
+ start += PAGE_SIZE;
+ pos += PAGE_SIZE;
+ if (size > PAGE_SIZE)
+ size -= PAGE_SIZE;
+ else
+ size = 0;
+ }
+
+ return 0;
+
+}
+
+#define PSEUDO_PALETTE_SIZE 16
+
+static int x68kfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int transp, struct fb_info *info)
+{
+ u16 *pal = info->pseudo_palette;
+ u32 cr = red >> (16 - info->var.red.length);
+ u32 cg = green >> (16 - info->var.green.length);
+ u32 cb = blue >> (16 - info->var.blue.length);
+ u16 value;
+
+ if (regno >= PSEUDO_PALETTE_SIZE)
+ return -EINVAL;
+
+ value = (cr << info->var.red.offset) |
+ (cg << info->var.green.offset) |
+ (cb << info->var.blue.offset);
+ if (info->var.transp.length > 0) {
+ u32 mask = (1 << info->var.transp.length) - 1;
+ mask <<= info->var.transp.offset;
+ value |= mask;
+ }
+ pal[regno] = value;
+
+ return 0;
+}
+
+static const u32 x68kfb_tab16_be[] = {
+ 0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
+};
+
+#define FB_WRITEL fb_writel
+#define FB_READL fb_readl
+
+static inline void color_imageblit(const struct fb_image *image,
+ struct fb_info *p, u8 __iomem *dst1,
+ u32 start_index,
+ u32 pitch_index)
+{
+ /* Draw the penguin */
+ u32 __iomem *dst, *dst2;
+ u32 color = 0, val, shift;
+ int i, n, bpp = p->var.bits_per_pixel;
+ u32 null_bits = 32 - bpp;
+ u32 *palette = (u32 *) p->pseudo_palette;
+ const u8 *src = image->data;
+ u32 bswapmask = fb_compute_bswapmask(p);
+
+ dst2 = (u32 __iomem *) dst1;
+ for (i = image->height; i--; ) {
+ n = image->width;
+ dst = (u32 __iomem *) dst1;
+ shift = 0;
+ val = 0;
+
+ if (start_index) {
+ u32 start_mask = ~fb_shifted_pixels_mask_u32(p,
+ start_index, bswapmask);
+ val = FB_READL(dst) & start_mask;
+ shift = start_index;
+ }
+ while (n--) {
+ if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
+ p->fix.visual == FB_VISUAL_DIRECTCOLOR )
+ color = palette[*src];
+ else
+ color = *src;
+ color <<= FB_LEFT_POS(p, bpp);
+ val |= FB_SHIFT_HIGH(p, color, shift ^ bswapmask);
+ if (shift >= null_bits) {
+ FB_WRITEL(val, dst++);
+
+ val = (shift == null_bits) ? 0 :
+ FB_SHIFT_LOW(p, color, 32 - shift);
+ }
+ shift += bpp;
+ shift &= (32 - 1);
+ src++;
+ }
+ if (shift) {
+ u32 end_mask = fb_shifted_pixels_mask_u32(p, shift,
+ bswapmask);
+
+ FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
+ }
+ dst1 += p->fix.line_length;
+ if (pitch_index) {
+ dst2 += p->fix.line_length;
+ dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
+
+ start_index += pitch_index;
+ start_index &= 32 - 1;
+ }
+ }
+}
+
+static inline void fast_imageblit(const struct fb_image *image, struct fb_info *p,
+ u8 __iomem *dst1, u32 fgcolor,
+ u32 bgcolor)
+{
+ u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
+ u32 ppw = 16/bpp, spitch = (image->width + 7)/8;
+ u32 bit_mask, end_mask, eorx, shift;
+ const char *s = image->data, *src;
+ u16 __iomem *dst;
+ const u32 *tab = NULL;
+ int i, j, k;
+
+ tab = x68kfb_tab16_be;
+
+ for (i = ppw-1; i--; ) {
+ fgx <<= bpp;
+ bgx <<= bpp;
+ fgx |= fgcolor;
+ bgx |= bgcolor;
+ }
+
+ bit_mask = (1 << ppw) - 1;
+ eorx = fgx ^ bgx;
+ k = image->width/ppw;
+
+ for (i = image->height; i--; ) {
+ dst = (u16 __iomem *) dst1, shift = 8; src = s;
+
+ for (j = k; j--; ) {
+ shift -= ppw;
+ end_mask = tab[(*src >> shift) & bit_mask];
+ __raw_writew((end_mask & eorx)^bgx, dst++);
+ if (!shift) { shift = 8; src++; }
+ }
+ dst1 += p->fix.line_length;
+ s += spitch;
+ }
+}
+
+static void x68kfb_imageblit(struct fb_info *p, const struct fb_image *image)
+{
+ u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
+ u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
+ u32 dx = image->dx, dy = image->dy;
+ u8 __iomem *dst1;
+
+ if (p->state != FBINFO_STATE_RUNNING)
+ return;
+
+ bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
+ start_index = bitstart & (32 - 1);
+ pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
+
+ bitstart /= 8;
+ bitstart &= ~(bpl - 1);
+ dst1 = p->screen_base + bitstart;
+
+ if (p->fbops->fb_sync)
+ p->fbops->fb_sync(p);
+
+ if (image->depth == 1) {
+ if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
+ p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
+ fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
+ bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
+ } else {
+ fgcolor = image->fg_color;
+ bgcolor = image->bg_color;
+ }
+
+ fast_imageblit(image, p, dst1, fgcolor, bgcolor);
+ } else
+ color_imageblit(image, p, dst1, start_index, pitch_index);
+}
+
+#ifndef MODULE
+/*
+ * The virtual framebuffer driver is only enabled if explicitly
+ * requested by passing 'video=vfb:' (or any actual options).
+ */
+static int __init x68kfb_setup(char *options)
+{
+ char *this_opt;
+
+ x68kfb_enable = 0;
+
+ if (!options)
+ return 1;
+
+ x68kfb_enable = 1;
+
+ if (!*options)
+ return 1;
+
+ while ((this_opt = strsep(&options, ",")) != NULL) {
+ if (!*this_opt)
+ continue;
+ /* Test disable for backwards compatibility */
+ if (!strcmp(this_opt, "disable"))
+ x68kfb_enable = 0;
+ }
+ return 1;
+}
+#endif /* MODULE */
+
+ /*
+ * Initialisation
+ */
+
+static int x68kfb_probe(struct platform_device *dev)
+{
+ struct fb_info *info;
+ int retval = -ENOMEM;
+
+ /*
+ * For real video cards we use ioremap.
+ */
+ if (!(videomemory = ioremap(0xc00000, 0x200000)))
+ return retval;
+
+ info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
+ if (!info)
+ goto err;
+
+ info->screen_base = (char __iomem *)videomemory;
+ info->fbops = &x68kfb_ops;
+
+ info->var = x68kfb_default;
+ x68kfb_fix.smem_start = (unsigned long) videomemory;
+ x68kfb_fix.smem_len = videomemorysize;
+ info->fix = x68kfb_fix;
+ info->pseudo_palette = info->par;
+ info->par = NULL;
+ info->flags = FBINFO_FLAG_DEFAULT;
+ info->pseudo_palette = (void *)0xe82000;;
+
+ retval = fb_alloc_cmap(&info->cmap, 256, 0);
+ if (retval < 0)
+ goto err1;
+
+ retval = register_framebuffer(info);
+ if (retval < 0)
+ goto err2;
+ platform_set_drvdata(dev, info);
+
+ fb_info(info, "X68000 frame buffer device, using %ldK of video memory\n",
+ videomemorysize >> 10);
+ return 0;
+err2:
+ fb_dealloc_cmap(&info->cmap);
+err1:
+ framebuffer_release(info);
+err:
+ iounmap(videomemory);
+ return retval;
+}
+
+static int x68kfb_remove(struct platform_device *dev)
+{
+ struct fb_info *info = platform_get_drvdata(dev);
+
+ if (info) {
+ unregister_framebuffer(info);
+ iounmap(videomemory);
+ fb_dealloc_cmap(&info->cmap);
+ framebuffer_release(info);
+ }
+ return 0;
+}
+
+static struct platform_driver x68kfb_driver = {
+ .probe = x68kfb_probe,
+ .remove = x68kfb_remove,
+ .driver = {
+ .name = "X68kfb",
+ },
+};
+
+static struct platform_device *x68kfb_device;
+
+static int __init x68kfb_init(void)
+{
+ int ret = 0;
+
+#ifndef MODULE
+ char *option = NULL;
+
+ if (fb_get_options("x68kfb", &option))
+ return -ENODEV;
+ x68kfb_setup(option);
+#endif
+
+ if (!x68kfb_enable)
+ return -ENXIO;
+
+ ret = platform_driver_register(&x68kfb_driver);
+
+ if (!ret) {
+ x68kfb_device = platform_device_alloc("X68kfb", 0);
+ if (x68kfb_device)
+ ret = platform_device_add(x68kfb_device);
+ else
+ ret = -ENOMEM;
+
+ if (ret) {
+ platform_device_put(x68kfb_device);
+ platform_driver_unregister(&x68kfb_driver);
+ }
+ }
+
+ return ret;
+}
+
+module_init(x68kfb_init);
+
+#ifdef MODULE
+static void __exit x68kfb_exit(void)
+{
+ platform_device_unregister(x68kfb_device);
+ platform_driver_unregister(&x68kfb_driver);
+}
+
+module_exit(x68kfb_exit);
+
+MODULE_LICENSE("GPL");
+#endif /* MODULE */
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