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-rw-r--r--drivers/video/vga16fb.c1444
1 files changed, 1444 insertions, 0 deletions
diff --git a/drivers/video/vga16fb.c b/drivers/video/vga16fb.c
new file mode 100644
index 0000000..b46454c
--- /dev/null
+++ b/drivers/video/vga16fb.c
@@ -0,0 +1,1444 @@
+/*
+ * linux/drivers/video/vga16.c -- VGA 16-color framebuffer driver
+ *
+ * Copyright 1999 Ben Pfaff <pfaffben@debian.org> and Petr Vandrovec <VANDROVE@vc.cvut.cz>
+ * Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm
+ * Based on VESA framebuffer (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
+ *
+ * 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/tty.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <video/vga.h>
+
+#define GRAPHICS_ADDR_REG VGA_GFX_I /* Graphics address register. */
+#define GRAPHICS_DATA_REG VGA_GFX_D /* Graphics data register. */
+
+#define SET_RESET_INDEX VGA_GFX_SR_VALUE /* Set/Reset Register index. */
+#define ENABLE_SET_RESET_INDEX VGA_GFX_SR_ENABLE /* Enable Set/Reset Register index. */
+#define DATA_ROTATE_INDEX VGA_GFX_DATA_ROTATE /* Data Rotate Register index. */
+#define GRAPHICS_MODE_INDEX VGA_GFX_MODE /* Graphics Mode Register index. */
+#define BIT_MASK_INDEX VGA_GFX_BIT_MASK /* Bit Mask Register index. */
+
+#define dac_reg (VGA_PEL_IW)
+#define dac_val (VGA_PEL_D)
+
+#define VGA_FB_PHYS 0xA0000
+#define VGA_FB_PHYS_LEN 65536
+
+#define MODE_SKIP4 1
+#define MODE_8BPP 2
+#define MODE_CFB 4
+#define MODE_TEXT 8
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * card parameters
+ */
+
+static struct fb_info vga16fb;
+
+static struct vga16fb_par {
+ /* structure holding original VGA register settings when the
+ screen is blanked */
+ struct {
+ unsigned char SeqCtrlIndex; /* Sequencer Index reg. */
+ unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */
+ unsigned char CrtMiscIO; /* Miscellaneous register */
+ unsigned char HorizontalTotal; /* CRT-Controller:00h */
+ unsigned char HorizDisplayEnd; /* CRT-Controller:01h */
+ unsigned char StartHorizRetrace; /* CRT-Controller:04h */
+ unsigned char EndHorizRetrace; /* CRT-Controller:05h */
+ unsigned char Overflow; /* CRT-Controller:07h */
+ unsigned char StartVertRetrace; /* CRT-Controller:10h */
+ unsigned char EndVertRetrace; /* CRT-Controller:11h */
+ unsigned char ModeControl; /* CRT-Controller:17h */
+ unsigned char ClockingMode; /* Seq-Controller:01h */
+ } vga_state;
+ struct vgastate state;
+ atomic_t ref_count;
+ int palette_blanked, vesa_blanked, mode, isVGA;
+ u8 misc, pel_msk, vss, clkdiv;
+ u8 crtc[VGA_CRT_C];
+} vga16_par;
+
+/* --------------------------------------------------------------------- */
+
+static struct fb_var_screeninfo vga16fb_defined = {
+ .xres = 640,
+ .yres = 480,
+ .xres_virtual = 640,
+ .yres_virtual = 480,
+ .bits_per_pixel = 4,
+ .activate = FB_ACTIVATE_TEST,
+ .height = -1,
+ .width = -1,
+ .pixclock = 39721,
+ .left_margin = 48,
+ .right_margin = 16,
+ .upper_margin = 33,
+ .lower_margin = 10,
+ .hsync_len = 96,
+ .vsync_len = 2,
+ .vmode = FB_VMODE_NONINTERLACED,
+};
+
+/* name should not depend on EGA/VGA */
+static struct fb_fix_screeninfo vga16fb_fix __initdata = {
+ .id = "VGA16 VGA",
+ .smem_start = VGA_FB_PHYS,
+ .smem_len = VGA_FB_PHYS_LEN,
+ .type = FB_TYPE_VGA_PLANES,
+ .type_aux = FB_AUX_VGA_PLANES_VGA4,
+ .visual = FB_VISUAL_PSEUDOCOLOR,
+ .xpanstep = 8,
+ .ypanstep = 1,
+ .line_length = 640/8,
+ .accel = FB_ACCEL_NONE
+};
+
+/* The VGA's weird architecture often requires that we read a byte and
+ write a byte to the same location. It doesn't matter *what* byte
+ we write, however. This is because all the action goes on behind
+ the scenes in the VGA's 32-bit latch register, and reading and writing
+ video memory just invokes latch behavior.
+
+ To avoid race conditions (is this necessary?), reading and writing
+ the memory byte should be done with a single instruction. One
+ suitable instruction is the x86 bitwise OR. The following
+ read-modify-write routine should optimize to one such bitwise
+ OR. */
+static inline void rmw(volatile char __iomem *p)
+{
+ readb(p);
+ writeb(1, p);
+}
+
+/* Set the Graphics Mode Register, and return its previous value.
+ Bits 0-1 are write mode, bit 3 is read mode. */
+static inline int setmode(int mode)
+{
+ int oldmode;
+
+ vga_io_w(GRAPHICS_ADDR_REG, GRAPHICS_MODE_INDEX);
+ oldmode = vga_io_r(GRAPHICS_DATA_REG);
+ vga_io_w(GRAPHICS_DATA_REG, mode);
+ return oldmode;
+}
+
+/* Select the Bit Mask Register and return its value. */
+static inline int selectmask(void)
+{
+ return vga_io_rgfx(BIT_MASK_INDEX);
+}
+
+/* Set the value of the Bit Mask Register. It must already have been
+ selected with selectmask(). */
+static inline void setmask(int mask)
+{
+ vga_io_w(GRAPHICS_DATA_REG, mask);
+}
+
+/* Set the Data Rotate Register and return its old value.
+ Bits 0-2 are rotate count, bits 3-4 are logical operation
+ (0=NOP, 1=AND, 2=OR, 3=XOR). */
+static inline int setop(int op)
+{
+ int oldop;
+
+ vga_io_w(GRAPHICS_ADDR_REG, DATA_ROTATE_INDEX);
+ oldop = vga_io_r(GRAPHICS_DATA_REG);
+ vga_io_w(GRAPHICS_DATA_REG, op);
+ return oldop;
+}
+
+/* Set the Enable Set/Reset Register and return its old value.
+ The code here always uses value 0xf for thsi register. */
+static inline int setsr(int sr)
+{
+ int oldsr;
+
+ vga_io_w(GRAPHICS_ADDR_REG, ENABLE_SET_RESET_INDEX);
+ oldsr = vga_io_r(GRAPHICS_DATA_REG);
+ vga_io_w(GRAPHICS_DATA_REG, sr);
+ return oldsr;
+}
+
+/* Set the Set/Reset Register and return its old value. */
+static inline int setcolor(int color)
+{
+ int oldcolor;
+
+ vga_io_w(GRAPHICS_ADDR_REG, SET_RESET_INDEX);
+ oldcolor = vga_io_r(GRAPHICS_DATA_REG);
+ vga_io_w(GRAPHICS_DATA_REG, color);
+ return oldcolor;
+}
+
+/* Return the value in the Graphics Address Register. */
+static inline int getindex(void)
+{
+ return vga_io_r(GRAPHICS_ADDR_REG);
+}
+
+/* Set the value in the Graphics Address Register. */
+static inline void setindex(int index)
+{
+ vga_io_w(GRAPHICS_ADDR_REG, index);
+}
+
+static void vga16fb_pan_var(struct fb_info *info,
+ struct fb_var_screeninfo *var)
+{
+ struct vga16fb_par *par = (struct vga16fb_par *) info->par;
+ u32 xoffset, pos;
+
+ xoffset = var->xoffset;
+ if (info->var.bits_per_pixel == 8) {
+ pos = (info->var.xres_virtual * var->yoffset + xoffset) >> 2;
+ } else if (par->mode & MODE_TEXT) {
+ int fh = 16; // FIXME !!! font height. Fugde for now.
+ pos = (info->var.xres_virtual * (var->yoffset / fh) + xoffset) >> 3;
+ } else {
+ if (info->var.nonstd)
+ xoffset--;
+ pos = (info->var.xres_virtual * var->yoffset + xoffset) >> 3;
+ }
+ vga_io_wcrt(VGA_CRTC_START_HI, pos >> 8);
+ vga_io_wcrt(VGA_CRTC_START_LO, pos & 0xFF);
+ /* if we support CFB4, then we must! support xoffset with pixel
+ * granularity if someone supports xoffset in bit resolution */
+ vga_io_r(VGA_IS1_RC); /* reset flip-flop */
+ vga_io_w(VGA_ATT_IW, VGA_ATC_PEL);
+ if (var->bits_per_pixel == 8)
+ vga_io_w(VGA_ATT_IW, (xoffset & 3) << 1);
+ else
+ vga_io_w(VGA_ATT_IW, xoffset & 7);
+ vga_io_r(VGA_IS1_RC);
+ vga_io_w(VGA_ATT_IW, 0x20);
+}
+
+static void vga16fb_update_fix(struct fb_info *info)
+{
+ if (info->var.bits_per_pixel == 4) {
+ if (info->var.nonstd) {
+ info->fix.type = FB_TYPE_PACKED_PIXELS;
+ info->fix.line_length = info->var.xres_virtual / 2;
+ } else {
+ info->fix.type = FB_TYPE_VGA_PLANES;
+ info->fix.type_aux = FB_AUX_VGA_PLANES_VGA4;
+ info->fix.line_length = info->var.xres_virtual / 8;
+ }
+ } else if (info->var.bits_per_pixel == 0) {
+ info->fix.type = FB_TYPE_TEXT;
+ info->fix.type_aux = FB_AUX_TEXT_CGA;
+ info->fix.line_length = info->var.xres_virtual / 4;
+ } else { /* 8bpp */
+ if (info->var.nonstd) {
+ info->fix.type = FB_TYPE_VGA_PLANES;
+ info->fix.type_aux = FB_AUX_VGA_PLANES_CFB8;
+ info->fix.line_length = info->var.xres_virtual / 4;
+ } else {
+ info->fix.type = FB_TYPE_PACKED_PIXELS;
+ info->fix.line_length = info->var.xres_virtual;
+ }
+ }
+}
+
+static void vga16fb_clock_chip(struct vga16fb_par *par,
+ unsigned int pixclock,
+ const struct fb_info *info,
+ int mul, int div)
+{
+ static struct {
+ u32 pixclock;
+ u8 misc;
+ u8 seq_clock_mode;
+ } *ptr, *best, vgaclocks[] = {
+ { 79442 /* 12.587 */, 0x00, 0x08},
+ { 70616 /* 14.161 */, 0x04, 0x08},
+ { 39721 /* 25.175 */, 0x00, 0x00},
+ { 35308 /* 28.322 */, 0x04, 0x00},
+ { 0 /* bad */, 0x00, 0x00}};
+ int err;
+
+ pixclock = (pixclock * mul) / div;
+ best = vgaclocks;
+ err = pixclock - best->pixclock;
+ if (err < 0) err = -err;
+ for (ptr = vgaclocks + 1; ptr->pixclock; ptr++) {
+ int tmp;
+
+ tmp = pixclock - ptr->pixclock;
+ if (tmp < 0) tmp = -tmp;
+ if (tmp < err) {
+ err = tmp;
+ best = ptr;
+ }
+ }
+ par->misc |= best->misc;
+ par->clkdiv = best->seq_clock_mode;
+ pixclock = (best->pixclock * div) / mul;
+}
+
+#define FAIL(X) return -EINVAL
+
+static int vga16fb_open(struct fb_info *info, int user)
+{
+ struct vga16fb_par *par = (struct vga16fb_par *) info->par;
+ int cnt = atomic_read(&par->ref_count);
+
+ if (!cnt) {
+ memset(&par->state, 0, sizeof(struct vgastate));
+ par->state.flags = VGA_SAVE_FONTS | VGA_SAVE_MODE |
+ VGA_SAVE_CMAP;
+ save_vga(&par->state);
+ }
+ atomic_inc(&par->ref_count);
+ return 0;
+}
+
+static int vga16fb_release(struct fb_info *info, int user)
+{
+ struct vga16fb_par *par = (struct vga16fb_par *) info->par;
+ int cnt = atomic_read(&par->ref_count);
+
+ if (!cnt)
+ return -EINVAL;
+ if (cnt == 1)
+ restore_vga(&par->state);
+ atomic_dec(&par->ref_count);
+
+ return 0;
+}
+
+static int vga16fb_check_var(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ struct vga16fb_par *par = (struct vga16fb_par *) info->par;
+ u32 xres, right, hslen, left, xtotal;
+ u32 yres, lower, vslen, upper, ytotal;
+ u32 vxres, xoffset, vyres, yoffset;
+ u32 pos;
+ u8 r7, rMode;
+ int shift;
+ int mode;
+ u32 maxmem;
+
+ par->pel_msk = 0xFF;
+
+ if (var->bits_per_pixel == 4) {
+ if (var->nonstd) {
+ if (!par->isVGA)
+ return -EINVAL;
+ shift = 3;
+ mode = MODE_SKIP4 | MODE_CFB;
+ maxmem = 16384;
+ par->pel_msk = 0x0F;
+ } else {
+ shift = 3;
+ mode = 0;
+ maxmem = 65536;
+ }
+ } else if (var->bits_per_pixel == 8) {
+ if (!par->isVGA)
+ return -EINVAL; /* no support on EGA */
+ shift = 2;
+ if (var->nonstd) {
+ mode = MODE_8BPP | MODE_CFB;
+ maxmem = 65536;
+ } else {
+ mode = MODE_SKIP4 | MODE_8BPP | MODE_CFB;
+ maxmem = 16384;
+ }
+ } else
+ return -EINVAL;
+
+ xres = (var->xres + 7) & ~7;
+ vxres = (var->xres_virtual + 0xF) & ~0xF;
+ xoffset = (var->xoffset + 7) & ~7;
+ left = (var->left_margin + 7) & ~7;
+ right = (var->right_margin + 7) & ~7;
+ hslen = (var->hsync_len + 7) & ~7;
+
+ if (vxres < xres)
+ vxres = xres;
+ if (xres + xoffset > vxres)
+ xoffset = vxres - xres;
+
+ var->xres = xres;
+ var->right_margin = right;
+ var->hsync_len = hslen;
+ var->left_margin = left;
+ var->xres_virtual = vxres;
+ var->xoffset = xoffset;
+
+ xres >>= shift;
+ right >>= shift;
+ hslen >>= shift;
+ left >>= shift;
+ vxres >>= shift;
+ xtotal = xres + right + hslen + left;
+ if (xtotal >= 256)
+ FAIL("xtotal too big");
+ if (hslen > 32)
+ FAIL("hslen too big");
+ if (right + hslen + left > 64)
+ FAIL("hblank too big");
+ par->crtc[VGA_CRTC_H_TOTAL] = xtotal - 5;
+ par->crtc[VGA_CRTC_H_BLANK_START] = xres - 1;
+ par->crtc[VGA_CRTC_H_DISP] = xres - 1;
+ pos = xres + right;
+ par->crtc[VGA_CRTC_H_SYNC_START] = pos;
+ pos += hslen;
+ par->crtc[VGA_CRTC_H_SYNC_END] = pos & 0x1F;
+ pos += left - 2; /* blank_end + 2 <= total + 5 */
+ par->crtc[VGA_CRTC_H_BLANK_END] = (pos & 0x1F) | 0x80;
+ if (pos & 0x20)
+ par->crtc[VGA_CRTC_H_SYNC_END] |= 0x80;
+
+ yres = var->yres;
+ lower = var->lower_margin;
+ vslen = var->vsync_len;
+ upper = var->upper_margin;
+ vyres = var->yres_virtual;
+ yoffset = var->yoffset;
+
+ if (yres > vyres)
+ vyres = yres;
+ if (vxres * vyres > maxmem) {
+ vyres = maxmem / vxres;
+ if (vyres < yres)
+ return -ENOMEM;
+ }
+ if (yoffset + yres > vyres)
+ yoffset = vyres - yres;
+ var->yres = yres;
+ var->lower_margin = lower;
+ var->vsync_len = vslen;
+ var->upper_margin = upper;
+ var->yres_virtual = vyres;
+ var->yoffset = yoffset;
+
+ if (var->vmode & FB_VMODE_DOUBLE) {
+ yres <<= 1;
+ lower <<= 1;
+ vslen <<= 1;
+ upper <<= 1;
+ }
+ ytotal = yres + lower + vslen + upper;
+ if (ytotal > 1024) {
+ ytotal >>= 1;
+ yres >>= 1;
+ lower >>= 1;
+ vslen >>= 1;
+ upper >>= 1;
+ rMode = 0x04;
+ } else
+ rMode = 0x00;
+ if (ytotal > 1024)
+ FAIL("ytotal too big");
+ if (vslen > 16)
+ FAIL("vslen too big");
+ par->crtc[VGA_CRTC_V_TOTAL] = ytotal - 2;
+ r7 = 0x10; /* disable linecompare */
+ if (ytotal & 0x100) r7 |= 0x01;
+ if (ytotal & 0x200) r7 |= 0x20;
+ par->crtc[VGA_CRTC_PRESET_ROW] = 0;
+ par->crtc[VGA_CRTC_MAX_SCAN] = 0x40; /* 1 scanline, no linecmp */
+ if (var->vmode & FB_VMODE_DOUBLE)
+ par->crtc[VGA_CRTC_MAX_SCAN] |= 0x80;
+ par->crtc[VGA_CRTC_CURSOR_START] = 0x20;
+ par->crtc[VGA_CRTC_CURSOR_END] = 0x00;
+ if ((mode & (MODE_CFB | MODE_8BPP)) == MODE_CFB)
+ xoffset--;
+ pos = yoffset * vxres + (xoffset >> shift);
+ par->crtc[VGA_CRTC_START_HI] = pos >> 8;
+ par->crtc[VGA_CRTC_START_LO] = pos & 0xFF;
+ par->crtc[VGA_CRTC_CURSOR_HI] = 0x00;
+ par->crtc[VGA_CRTC_CURSOR_LO] = 0x00;
+ pos = yres - 1;
+ par->crtc[VGA_CRTC_V_DISP_END] = pos & 0xFF;
+ par->crtc[VGA_CRTC_V_BLANK_START] = pos & 0xFF;
+ if (pos & 0x100)
+ r7 |= 0x0A; /* 0x02 -> DISP_END, 0x08 -> BLANK_START */
+ if (pos & 0x200) {
+ r7 |= 0x40; /* 0x40 -> DISP_END */
+ par->crtc[VGA_CRTC_MAX_SCAN] |= 0x20; /* BLANK_START */
+ }
+ pos += lower;
+ par->crtc[VGA_CRTC_V_SYNC_START] = pos & 0xFF;
+ if (pos & 0x100)
+ r7 |= 0x04;
+ if (pos & 0x200)
+ r7 |= 0x80;
+ pos += vslen;
+ par->crtc[VGA_CRTC_V_SYNC_END] = (pos & 0x0F) & ~0x10; /* disabled IRQ */
+ pos += upper - 1; /* blank_end + 1 <= ytotal + 2 */
+ par->crtc[VGA_CRTC_V_BLANK_END] = pos & 0xFF; /* 0x7F for original VGA,
+ but some SVGA chips requires all 8 bits to set */
+ if (vxres >= 512)
+ FAIL("vxres too long");
+ par->crtc[VGA_CRTC_OFFSET] = vxres >> 1;
+ if (mode & MODE_SKIP4)
+ par->crtc[VGA_CRTC_UNDERLINE] = 0x5F; /* 256, cfb8 */
+ else
+ par->crtc[VGA_CRTC_UNDERLINE] = 0x1F; /* 16, vgap */
+ par->crtc[VGA_CRTC_MODE] = rMode | ((mode & MODE_TEXT) ? 0xA3 : 0xE3);
+ par->crtc[VGA_CRTC_LINE_COMPARE] = 0xFF;
+ par->crtc[VGA_CRTC_OVERFLOW] = r7;
+
+ par->vss = 0x00; /* 3DA */
+
+ par->misc = 0xE3; /* enable CPU, ports 0x3Dx, positive sync */
+ if (var->sync & FB_SYNC_HOR_HIGH_ACT)
+ par->misc &= ~0x40;
+ if (var->sync & FB_SYNC_VERT_HIGH_ACT)
+ par->misc &= ~0x80;
+
+ par->mode = mode;
+
+ if (mode & MODE_8BPP)
+ /* pixel clock == vga clock / 2 */
+ vga16fb_clock_chip(par, var->pixclock, info, 1, 2);
+ else
+ /* pixel clock == vga clock */
+ vga16fb_clock_chip(par, var->pixclock, info, 1, 1);
+
+ var->red.offset = var->green.offset = var->blue.offset =
+ var->transp.offset = 0;
+ var->red.length = var->green.length = var->blue.length =
+ (par->isVGA) ? 6 : 2;
+ var->transp.length = 0;
+ var->activate = FB_ACTIVATE_NOW;
+ var->height = -1;
+ var->width = -1;
+ var->accel_flags = 0;
+ return 0;
+}
+#undef FAIL
+
+static int vga16fb_set_par(struct fb_info *info)
+{
+ struct vga16fb_par *par = (struct vga16fb_par *) info->par;
+ u8 gdc[VGA_GFX_C];
+ u8 seq[VGA_SEQ_C];
+ u8 atc[VGA_ATT_C];
+ int fh, i;
+
+ seq[VGA_SEQ_CLOCK_MODE] = 0x01 | par->clkdiv;
+ if (par->mode & MODE_TEXT)
+ seq[VGA_SEQ_PLANE_WRITE] = 0x03;
+ else
+ seq[VGA_SEQ_PLANE_WRITE] = 0x0F;
+ seq[VGA_SEQ_CHARACTER_MAP] = 0x00;
+ if (par->mode & MODE_TEXT)
+ seq[VGA_SEQ_MEMORY_MODE] = 0x03;
+ else if (par->mode & MODE_SKIP4)
+ seq[VGA_SEQ_MEMORY_MODE] = 0x0E;
+ else
+ seq[VGA_SEQ_MEMORY_MODE] = 0x06;
+
+ gdc[VGA_GFX_SR_VALUE] = 0x00;
+ gdc[VGA_GFX_SR_ENABLE] = 0x00;
+ gdc[VGA_GFX_COMPARE_VALUE] = 0x00;
+ gdc[VGA_GFX_DATA_ROTATE] = 0x00;
+ gdc[VGA_GFX_PLANE_READ] = 0;
+ if (par->mode & MODE_TEXT) {
+ gdc[VGA_GFX_MODE] = 0x10;
+ gdc[VGA_GFX_MISC] = 0x06;
+ } else {
+ if (par->mode & MODE_CFB)
+ gdc[VGA_GFX_MODE] = 0x40;
+ else
+ gdc[VGA_GFX_MODE] = 0x00;
+ gdc[VGA_GFX_MISC] = 0x05;
+ }
+ gdc[VGA_GFX_COMPARE_MASK] = 0x0F;
+ gdc[VGA_GFX_BIT_MASK] = 0xFF;
+
+ for (i = 0x00; i < 0x10; i++)
+ atc[i] = i;
+ if (par->mode & MODE_TEXT)
+ atc[VGA_ATC_MODE] = 0x04;
+ else if (par->mode & MODE_8BPP)
+ atc[VGA_ATC_MODE] = 0x41;
+ else
+ atc[VGA_ATC_MODE] = 0x81;
+ atc[VGA_ATC_OVERSCAN] = 0x00; /* 0 for EGA, 0xFF for VGA */
+ atc[VGA_ATC_PLANE_ENABLE] = 0x0F;
+ if (par->mode & MODE_8BPP)
+ atc[VGA_ATC_PEL] = (info->var.xoffset & 3) << 1;
+ else
+ atc[VGA_ATC_PEL] = info->var.xoffset & 7;
+ atc[VGA_ATC_COLOR_PAGE] = 0x00;
+
+ if (par->mode & MODE_TEXT) {
+ fh = 16; // FIXME !!! Fudge font height.
+ par->crtc[VGA_CRTC_MAX_SCAN] = (par->crtc[VGA_CRTC_MAX_SCAN]
+ & ~0x1F) | (fh - 1);
+ }
+
+ vga_io_w(VGA_MIS_W, vga_io_r(VGA_MIS_R) | 0x01);
+
+ /* Enable graphics register modification */
+ if (!par->isVGA) {
+ vga_io_w(EGA_GFX_E0, 0x00);
+ vga_io_w(EGA_GFX_E1, 0x01);
+ }
+
+ /* update misc output register */
+ vga_io_w(VGA_MIS_W, par->misc);
+
+ /* synchronous reset on */
+ vga_io_wseq(0x00, 0x01);
+
+ if (par->isVGA)
+ vga_io_w(VGA_PEL_MSK, par->pel_msk);
+
+ /* write sequencer registers */
+ vga_io_wseq(VGA_SEQ_CLOCK_MODE, seq[VGA_SEQ_CLOCK_MODE] | 0x20);
+ for (i = 2; i < VGA_SEQ_C; i++) {
+ vga_io_wseq(i, seq[i]);
+ }
+
+ /* synchronous reset off */
+ vga_io_wseq(0x00, 0x03);
+
+ /* deprotect CRT registers 0-7 */
+ vga_io_wcrt(VGA_CRTC_V_SYNC_END, par->crtc[VGA_CRTC_V_SYNC_END]);
+
+ /* write CRT registers */
+ for (i = 0; i < VGA_CRTC_REGS; i++) {
+ vga_io_wcrt(i, par->crtc[i]);
+ }
+
+ /* write graphics controller registers */
+ for (i = 0; i < VGA_GFX_C; i++) {
+ vga_io_wgfx(i, gdc[i]);
+ }
+
+ /* write attribute controller registers */
+ for (i = 0; i < VGA_ATT_C; i++) {
+ vga_io_r(VGA_IS1_RC); /* reset flip-flop */
+ vga_io_wattr(i, atc[i]);
+ }
+
+ /* Wait for screen to stabilize. */
+ mdelay(50);
+
+ vga_io_wseq(VGA_SEQ_CLOCK_MODE, seq[VGA_SEQ_CLOCK_MODE]);
+
+ vga_io_r(VGA_IS1_RC);
+ vga_io_w(VGA_ATT_IW, 0x20);
+
+ vga16fb_update_fix(info);
+ return 0;
+}
+
+static void ega16_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
+{
+ static unsigned char map[] = { 000, 001, 010, 011 };
+ int val;
+
+ if (regno >= 16)
+ return;
+ val = map[red>>14] | ((map[green>>14]) << 1) | ((map[blue>>14]) << 2);
+ vga_io_r(VGA_IS1_RC); /* ! 0x3BA */
+ vga_io_wattr(regno, val);
+ vga_io_r(VGA_IS1_RC); /* some clones need it */
+ vga_io_w(VGA_ATT_IW, 0x20); /* unblank screen */
+}
+
+static void vga16_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
+{
+ outb(regno, dac_reg);
+ outb(red >> 10, dac_val);
+ outb(green >> 10, dac_val);
+ outb(blue >> 10, dac_val);
+}
+
+static int vga16fb_setcolreg(unsigned regno, unsigned red, unsigned green,
+ unsigned blue, unsigned transp,
+ struct fb_info *info)
+{
+ struct vga16fb_par *par = (struct vga16fb_par *) info->par;
+ int gray;
+
+ /*
+ * 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.
+ */
+
+ if (regno >= 256)
+ return 1;
+
+ gray = info->var.grayscale;
+
+ if (gray) {
+ /* gray = 0.30*R + 0.59*G + 0.11*B */
+ red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
+ }
+ if (par->isVGA)
+ vga16_setpalette(regno,red,green,blue);
+ else
+ ega16_setpalette(regno,red,green,blue);
+ return 0;
+}
+
+static int vga16fb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ if (var->xoffset + info->var.xres > info->var.xres_virtual ||
+ var->yoffset + info->var.yres > info->var.yres_virtual)
+ return -EINVAL;
+
+ vga16fb_pan_var(info, var);
+
+ info->var.xoffset = var->xoffset;
+ info->var.yoffset = var->yoffset;
+ info->var.vmode &= ~FB_VMODE_YWRAP;
+ return 0;
+}
+
+/* The following VESA blanking code is taken from vgacon.c. The VGA
+ blanking code was originally by Huang shi chao, and modified by
+ Christoph Rimek (chrimek@toppoint.de) and todd j. derr
+ (tjd@barefoot.org) for Linux. */
+#define attrib_port VGA_ATC_IW
+#define seq_port_reg VGA_SEQ_I
+#define seq_port_val VGA_SEQ_D
+#define gr_port_reg VGA_GFX_I
+#define gr_port_val VGA_GFX_D
+#define video_misc_rd VGA_MIS_R
+#define video_misc_wr VGA_MIS_W
+#define vga_video_port_reg VGA_CRT_IC
+#define vga_video_port_val VGA_CRT_DC
+
+static void vga_vesa_blank(struct vga16fb_par *par, int mode)
+{
+ unsigned char SeqCtrlIndex;
+ unsigned char CrtCtrlIndex;
+
+ //cli();
+ SeqCtrlIndex = vga_io_r(seq_port_reg);
+ CrtCtrlIndex = vga_io_r(vga_video_port_reg);
+
+ /* save original values of VGA controller registers */
+ if(!par->vesa_blanked) {
+ par->vga_state.CrtMiscIO = vga_io_r(video_misc_rd);
+ //sti();
+
+ par->vga_state.HorizontalTotal = vga_io_rcrt(0x00); /* HorizontalTotal */
+ par->vga_state.HorizDisplayEnd = vga_io_rcrt(0x01); /* HorizDisplayEnd */
+ par->vga_state.StartHorizRetrace = vga_io_rcrt(0x04); /* StartHorizRetrace */
+ par->vga_state.EndHorizRetrace = vga_io_rcrt(0x05); /* EndHorizRetrace */
+ par->vga_state.Overflow = vga_io_rcrt(0x07); /* Overflow */
+ par->vga_state.StartVertRetrace = vga_io_rcrt(0x10); /* StartVertRetrace */
+ par->vga_state.EndVertRetrace = vga_io_rcrt(0x11); /* EndVertRetrace */
+ par->vga_state.ModeControl = vga_io_rcrt(0x17); /* ModeControl */
+ par->vga_state.ClockingMode = vga_io_rseq(0x01); /* ClockingMode */
+ }
+
+ /* assure that video is enabled */
+ /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */
+ //cli();
+ vga_io_wseq(0x01, par->vga_state.ClockingMode | 0x20);
+
+ /* test for vertical retrace in process.... */
+ if ((par->vga_state.CrtMiscIO & 0x80) == 0x80)
+ vga_io_w(video_misc_wr, par->vga_state.CrtMiscIO & 0xef);
+
+ /*
+ * Set <End of vertical retrace> to minimum (0) and
+ * <Start of vertical Retrace> to maximum (incl. overflow)
+ * Result: turn off vertical sync (VSync) pulse.
+ */
+ if (mode & FB_BLANK_VSYNC_SUSPEND) {
+ outb_p(0x10,vga_video_port_reg); /* StartVertRetrace */
+ outb_p(0xff,vga_video_port_val); /* maximum value */
+ outb_p(0x11,vga_video_port_reg); /* EndVertRetrace */
+ outb_p(0x40,vga_video_port_val); /* minimum (bits 0..3) */
+ outb_p(0x07,vga_video_port_reg); /* Overflow */
+ outb_p(par->vga_state.Overflow | 0x84,vga_video_port_val); /* bits 9,10 of vert. retrace */
+ }
+
+ if (mode & FB_BLANK_HSYNC_SUSPEND) {
+ /*
+ * Set <End of horizontal retrace> to minimum (0) and
+ * <Start of horizontal Retrace> to maximum
+ * Result: turn off horizontal sync (HSync) pulse.
+ */
+ outb_p(0x04,vga_video_port_reg); /* StartHorizRetrace */
+ outb_p(0xff,vga_video_port_val); /* maximum */
+ outb_p(0x05,vga_video_port_reg); /* EndHorizRetrace */
+ outb_p(0x00,vga_video_port_val); /* minimum (0) */
+ }
+
+ /* restore both index registers */
+ outb_p(SeqCtrlIndex,seq_port_reg);
+ outb_p(CrtCtrlIndex,vga_video_port_reg);
+ //sti();
+}
+
+static void vga_vesa_unblank(struct vga16fb_par *par)
+{
+ unsigned char SeqCtrlIndex;
+ unsigned char CrtCtrlIndex;
+
+ //cli();
+ SeqCtrlIndex = vga_io_r(seq_port_reg);
+ CrtCtrlIndex = vga_io_r(vga_video_port_reg);
+
+ /* restore original values of VGA controller registers */
+ vga_io_w(video_misc_wr, par->vga_state.CrtMiscIO);
+
+ /* HorizontalTotal */
+ vga_io_wcrt(0x00, par->vga_state.HorizontalTotal);
+ /* HorizDisplayEnd */
+ vga_io_wcrt(0x01, par->vga_state.HorizDisplayEnd);
+ /* StartHorizRetrace */
+ vga_io_wcrt(0x04, par->vga_state.StartHorizRetrace);
+ /* EndHorizRetrace */
+ vga_io_wcrt(0x05, par->vga_state.EndHorizRetrace);
+ /* Overflow */
+ vga_io_wcrt(0x07, par->vga_state.Overflow);
+ /* StartVertRetrace */
+ vga_io_wcrt(0x10, par->vga_state.StartVertRetrace);
+ /* EndVertRetrace */
+ vga_io_wcrt(0x11, par->vga_state.EndVertRetrace);
+ /* ModeControl */
+ vga_io_wcrt(0x17, par->vga_state.ModeControl);
+ /* ClockingMode */
+ vga_io_wseq(0x01, par->vga_state.ClockingMode);
+
+ /* restore index/control registers */
+ vga_io_w(seq_port_reg, SeqCtrlIndex);
+ vga_io_w(vga_video_port_reg, CrtCtrlIndex);
+ //sti();
+}
+
+static void vga_pal_blank(void)
+{
+ int i;
+
+ for (i=0; i<16; i++) {
+ outb_p (i, dac_reg) ;
+ outb_p (0, dac_val) ;
+ outb_p (0, dac_val) ;
+ outb_p (0, dac_val) ;
+ }
+}
+
+/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
+static int vga16fb_blank(int blank, struct fb_info *info)
+{
+ struct vga16fb_par *par = (struct vga16fb_par *) info->par;
+
+ switch (blank) {
+ case FB_BLANK_UNBLANK: /* Unblank */
+ if (par->vesa_blanked) {
+ vga_vesa_unblank(par);
+ par->vesa_blanked = 0;
+ }
+ if (par->palette_blanked) {
+ par->palette_blanked = 0;
+ }
+ break;
+ case FB_BLANK_NORMAL: /* blank */
+ vga_pal_blank();
+ par->palette_blanked = 1;
+ break;
+ default: /* VESA blanking */
+ vga_vesa_blank(par, blank);
+ par->vesa_blanked = 1;
+ break;
+ }
+ return 0;
+}
+
+static void vga_8planes_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
+{
+ u32 dx = rect->dx, width = rect->width;
+ char oldindex = getindex();
+ char oldmode = setmode(0x40);
+ char oldmask = selectmask();
+ int line_ofs, height;
+ char oldop, oldsr;
+ char __iomem *where;
+
+ dx /= 4;
+ where = info->screen_base + dx + rect->dy * info->fix.line_length;
+
+ if (rect->rop == ROP_COPY) {
+ oldop = setop(0);
+ oldsr = setsr(0);
+
+ width /= 4;
+ line_ofs = info->fix.line_length - width;
+ setmask(0xff);
+
+ height = rect->height;
+
+ while (height--) {
+ int x;
+
+ /* we can do memset... */
+ for (x = width; x > 0; --x) {
+ writeb(rect->color, where);
+ where++;
+ }
+ where += line_ofs;
+ }
+ } else {
+ char oldcolor = setcolor(0xf);
+ int y;
+
+ oldop = setop(0x18);
+ oldsr = setsr(0xf);
+ setmask(0x0F);
+ for (y = 0; y < rect->height; y++) {
+ rmw(where);
+ rmw(where+1);
+ where += info->fix.line_length;
+ }
+ setcolor(oldcolor);
+ }
+ setmask(oldmask);
+ setsr(oldsr);
+ setop(oldop);
+ setmode(oldmode);
+ setindex(oldindex);
+}
+
+static void vga16fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
+{
+ int x, x2, y2, vxres, vyres, width, height, line_ofs;
+ char __iomem *dst;
+
+ vxres = info->var.xres_virtual;
+ vyres = info->var.yres_virtual;
+
+ if (!rect->width || !rect->height || rect->dx > vxres || rect->dy > vyres)
+ return;
+
+ /* We could use hardware clipping but on many cards you get around
+ * hardware clipping by writing to framebuffer directly. */
+
+ x2 = rect->dx + rect->width;
+ y2 = rect->dy + rect->height;
+ x2 = x2 < vxres ? x2 : vxres;
+ y2 = y2 < vyres ? y2 : vyres;
+ width = x2 - rect->dx;
+
+ switch (info->fix.type) {
+ case FB_TYPE_VGA_PLANES:
+ if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
+
+ height = y2 - rect->dy;
+ width = rect->width/8;
+
+ line_ofs = info->fix.line_length - width;
+ dst = info->screen_base + (rect->dx/8) + rect->dy * info->fix.line_length;
+
+ switch (rect->rop) {
+ case ROP_COPY:
+ setmode(0);
+ setop(0);
+ setsr(0xf);
+ setcolor(rect->color);
+ selectmask();
+
+ setmask(0xff);
+
+ while (height--) {
+ for (x = 0; x < width; x++) {
+ writeb(0, dst);
+ dst++;
+ }
+ dst += line_ofs;
+ }
+ break;
+ case ROP_XOR:
+ setmode(0);
+ setop(0x18);
+ setsr(0xf);
+ setcolor(0xf);
+ selectmask();
+
+ setmask(0xff);
+ while (height--) {
+ for (x = 0; x < width; x++) {
+ rmw(dst);
+ dst++;
+ }
+ dst += line_ofs;
+ }
+ break;
+ }
+ } else
+ vga_8planes_fillrect(info, rect);
+ break;
+ case FB_TYPE_PACKED_PIXELS:
+ default:
+ cfb_fillrect(info, rect);
+ break;
+ }
+}
+
+static void vga_8planes_copyarea(struct fb_info *info, const struct fb_copyarea *area)
+{
+ char oldindex = getindex();
+ char oldmode = setmode(0x41);
+ char oldop = setop(0);
+ char oldsr = setsr(0xf);
+ int height, line_ofs, x;
+ u32 sx, dx, width;
+ char __iomem *dest;
+ char __iomem *src;
+
+ height = area->height;
+
+ sx = area->sx / 4;
+ dx = area->dx / 4;
+ width = area->width / 4;
+
+ if (area->dy < area->sy || (area->dy == area->sy && dx < sx)) {
+ line_ofs = info->fix.line_length - width;
+ dest = info->screen_base + dx + area->dy * info->fix.line_length;
+ src = info->screen_base + sx + area->sy * info->fix.line_length;
+ while (height--) {
+ for (x = 0; x < width; x++) {
+ readb(src);
+ writeb(0, dest);
+ src++;
+ dest++;
+ }
+ src += line_ofs;
+ dest += line_ofs;
+ }
+ } else {
+ line_ofs = info->fix.line_length - width;
+ dest = info->screen_base + dx + width +
+ (area->dy + height - 1) * info->fix.line_length;
+ src = info->screen_base + sx + width +
+ (area->sy + height - 1) * info->fix.line_length;
+ while (height--) {
+ for (x = 0; x < width; x++) {
+ --src;
+ --dest;
+ readb(src);
+ writeb(0, dest);
+ }
+ src -= line_ofs;
+ dest -= line_ofs;
+ }
+ }
+
+ setsr(oldsr);
+ setop(oldop);
+ setmode(oldmode);
+ setindex(oldindex);
+}
+
+static void vga16fb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
+{
+ u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy;
+ int x, x2, y2, old_dx, old_dy, vxres, vyres;
+ int height, width, line_ofs;
+ char __iomem *dst = NULL;
+ char __iomem *src = NULL;
+
+ vxres = info->var.xres_virtual;
+ vyres = info->var.yres_virtual;
+
+ if (area->dx > vxres || area->sx > vxres || area->dy > vyres ||
+ area->sy > vyres)
+ return;
+
+ /* clip the destination */
+ old_dx = area->dx;
+ old_dy = area->dy;
+
+ /*
+ * We could use hardware clipping but on many cards you get around
+ * hardware clipping by writing to framebuffer directly.
+ */
+ x2 = area->dx + area->width;
+ y2 = area->dy + area->height;
+ dx = area->dx > 0 ? area->dx : 0;
+ dy = area->dy > 0 ? area->dy : 0;
+ x2 = x2 < vxres ? x2 : vxres;
+ y2 = y2 < vyres ? y2 : vyres;
+ width = x2 - dx;
+ height = y2 - dy;
+
+ /* update sx1,sy1 */
+ sx += (dx - old_dx);
+ sy += (dy - old_dy);
+
+ /* the source must be completely inside the virtual screen */
+ if (sx < 0 || sy < 0 || (sx + width) > vxres || (sy + height) > vyres)
+ return;
+
+ switch (info->fix.type) {
+ case FB_TYPE_VGA_PLANES:
+ if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
+ width = width/8;
+ height = height;
+ line_ofs = info->fix.line_length - width;
+
+ setmode(1);
+ setop(0);
+ setsr(0xf);
+
+ if (dy < sy || (dy == sy && dx < sx)) {
+ dst = info->screen_base + (dx/8) + dy * info->fix.line_length;
+ src = info->screen_base + (sx/8) + sy * info->fix.line_length;
+ while (height--) {
+ for (x = 0; x < width; x++) {
+ readb(src);
+ writeb(0, dst);
+ dst++;
+ src++;
+ }
+ src += line_ofs;
+ dst += line_ofs;
+ }
+ } else {
+ dst = info->screen_base + (dx/8) + width +
+ (dy + height - 1) * info->fix.line_length;
+ src = info->screen_base + (sx/8) + width +
+ (sy + height - 1) * info->fix.line_length;
+ while (height--) {
+ for (x = 0; x < width; x++) {
+ dst--;
+ src--;
+ readb(src);
+ writeb(0, dst);
+ }
+ src -= line_ofs;
+ dst -= line_ofs;
+ }
+ }
+ } else
+ vga_8planes_copyarea(info, area);
+ break;
+ case FB_TYPE_PACKED_PIXELS:
+ default:
+ cfb_copyarea(info, area);
+ break;
+ }
+}
+
+#ifdef __LITTLE_ENDIAN
+static unsigned int transl_l[] =
+{0x0,0x8,0x4,0xC,0x2,0xA,0x6,0xE,0x1,0x9,0x5,0xD,0x3,0xB,0x7,0xF};
+static unsigned int transl_h[] =
+{0x000, 0x800, 0x400, 0xC00, 0x200, 0xA00, 0x600, 0xE00,
+ 0x100, 0x900, 0x500, 0xD00, 0x300, 0xB00, 0x700, 0xF00};
+#else
+#ifdef __BIG_ENDIAN
+static unsigned int transl_h[] =
+{0x0,0x8,0x4,0xC,0x2,0xA,0x6,0xE,0x1,0x9,0x5,0xD,0x3,0xB,0x7,0xF};
+static unsigned int transl_l[] =
+{0x000, 0x800, 0x400, 0xC00, 0x200, 0xA00, 0x600, 0xE00,
+ 0x100, 0x900, 0x500, 0xD00, 0x300, 0xB00, 0x700, 0xF00};
+#else
+#error "Only __BIG_ENDIAN and __LITTLE_ENDIAN are supported in vga-planes"
+#endif
+#endif
+
+static void vga_8planes_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+ char oldindex = getindex();
+ char oldmode = setmode(0x40);
+ char oldop = setop(0);
+ char oldsr = setsr(0);
+ char oldmask = selectmask();
+ const char *cdat = image->data;
+ u32 dx = image->dx;
+ char __iomem *where;
+ int y;
+
+ dx /= 4;
+ where = info->screen_base + dx + image->dy * info->fix.line_length;
+
+ setmask(0xff);
+ writeb(image->bg_color, where);
+ readb(where);
+ selectmask();
+ setmask(image->fg_color ^ image->bg_color);
+ setmode(0x42);
+ setop(0x18);
+ for (y = 0; y < image->height; y++, where += info->fix.line_length)
+ writew(transl_h[cdat[y]&0xF] | transl_l[cdat[y] >> 4], where);
+ setmask(oldmask);
+ setsr(oldsr);
+ setop(oldop);
+ setmode(oldmode);
+ setindex(oldindex);
+}
+
+static void vga_imageblit_expand(struct fb_info *info, const struct fb_image *image)
+{
+ char __iomem *where = info->screen_base + (image->dx/8) +
+ image->dy * info->fix.line_length;
+ struct vga16fb_par *par = (struct vga16fb_par *) info->par;
+ char *cdat = (char *) image->data;
+ char __iomem *dst;
+ int x, y;
+
+ switch (info->fix.type) {
+ case FB_TYPE_VGA_PLANES:
+ if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
+ if (par->isVGA) {
+ setmode(2);
+ setop(0);
+ setsr(0xf);
+ setcolor(image->fg_color);
+ selectmask();
+
+ setmask(0xff);
+ writeb(image->bg_color, where);
+ rmb();
+ readb(where); /* fill latches */
+ setmode(3);
+ wmb();
+ for (y = 0; y < image->height; y++) {
+ dst = where;
+ for (x = image->width/8; x--;)
+ writeb(*cdat++, dst++);
+ where += info->fix.line_length;
+ }
+ wmb();
+ } else {
+ setmode(0);
+ setop(0);
+ setsr(0xf);
+ setcolor(image->bg_color);
+ selectmask();
+
+ setmask(0xff);
+ for (y = 0; y < image->height; y++) {
+ dst = where;
+ for (x=image->width/8; x--;){
+ rmw(dst);
+ setcolor(image->fg_color);
+ selectmask();
+ if (*cdat) {
+ setmask(*cdat++);
+ rmw(dst++);
+ }
+ }
+ where += info->fix.line_length;
+ }
+ }
+ } else
+ vga_8planes_imageblit(info, image);
+ break;
+ case FB_TYPE_PACKED_PIXELS:
+ default:
+ cfb_imageblit(info, image);
+ break;
+ }
+}
+
+static void vga_imageblit_color(struct fb_info *info, const struct fb_image *image)
+{
+ /*
+ * Draw logo
+ */
+ struct vga16fb_par *par = (struct vga16fb_par *) info->par;
+ char __iomem *where =
+ info->screen_base + image->dy * info->fix.line_length +
+ image->dx/8;
+ const char *cdat = image->data;
+ char __iomem *dst;
+ int x, y;
+
+ switch (info->fix.type) {
+ case FB_TYPE_VGA_PLANES:
+ if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4 &&
+ par->isVGA) {
+ setsr(0xf);
+ setop(0);
+ setmode(0);
+
+ for (y = 0; y < image->height; y++) {
+ for (x = 0; x < image->width; x++) {
+ dst = where + x/8;
+
+ setcolor(*cdat);
+ selectmask();
+ setmask(1 << (7 - (x % 8)));
+ fb_readb(dst);
+ fb_writeb(0, dst);
+
+ cdat++;
+ }
+ where += info->fix.line_length;
+ }
+ }
+ break;
+ case FB_TYPE_PACKED_PIXELS:
+ cfb_imageblit(info, image);
+ break;
+ default:
+ break;
+ }
+}
+
+static void vga16fb_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+ if (image->depth == 1)
+ vga_imageblit_expand(info, image);
+ else
+ vga_imageblit_color(info, image);
+}
+
+static struct fb_ops vga16fb_ops = {
+ .owner = THIS_MODULE,
+ .fb_open = vga16fb_open,
+ .fb_release = vga16fb_release,
+ .fb_check_var = vga16fb_check_var,
+ .fb_set_par = vga16fb_set_par,
+ .fb_setcolreg = vga16fb_setcolreg,
+ .fb_pan_display = vga16fb_pan_display,
+ .fb_blank = vga16fb_blank,
+ .fb_fillrect = vga16fb_fillrect,
+ .fb_copyarea = vga16fb_copyarea,
+ .fb_imageblit = vga16fb_imageblit,
+ .fb_cursor = soft_cursor,
+};
+
+#ifndef MODULE
+static int vga16fb_setup(char *options)
+{
+ char *this_opt;
+
+ if (!options || !*options)
+ return 0;
+
+ while ((this_opt = strsep(&options, ",")) != NULL) {
+ if (!*this_opt) continue;
+ }
+ return 0;
+}
+#endif
+
+static int __init vga16fb_init(void)
+{
+ int i;
+ int ret;
+#ifndef MODULE
+ char *option = NULL;
+
+ if (fb_get_options("vga16fb", &option))
+ return -ENODEV;
+
+ vga16fb_setup(option);
+#endif
+ printk(KERN_DEBUG "vga16fb: initializing\n");
+
+ /* XXX share VGA_FB_PHYS and I/O region with vgacon and others */
+
+ vga16fb.screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS);
+ if (!vga16fb.screen_base) {
+ printk(KERN_ERR "vga16fb: unable to map device\n");
+ ret = -ENOMEM;
+ goto err_ioremap;
+ }
+ printk(KERN_INFO "vga16fb: mapped to 0x%p\n", vga16fb.screen_base);
+
+ vga16_par.isVGA = ORIG_VIDEO_ISVGA;
+ vga16_par.palette_blanked = 0;
+ vga16_par.vesa_blanked = 0;
+
+ i = vga16_par.isVGA? 6 : 2;
+
+ vga16fb_defined.red.length = i;
+ vga16fb_defined.green.length = i;
+ vga16fb_defined.blue.length = i;
+
+ /* name should not depend on EGA/VGA */
+ vga16fb.fbops = &vga16fb_ops;
+ vga16fb.var = vga16fb_defined;
+ vga16fb.fix = vga16fb_fix;
+ vga16fb.par = &vga16_par;
+ vga16fb.flags = FBINFO_FLAG_DEFAULT |
+ FBINFO_HWACCEL_YPAN;
+
+ i = (vga16fb_defined.bits_per_pixel == 8) ? 256 : 16;
+ ret = fb_alloc_cmap(&vga16fb.cmap, i, 0);
+ if (ret) {
+ printk(KERN_ERR "vga16fb: unable to allocate colormap\n");
+ ret = -ENOMEM;
+ goto err_alloc_cmap;
+ }
+
+ if (vga16fb_check_var(&vga16fb.var, &vga16fb)) {
+ printk(KERN_ERR "vga16fb: unable to validate variable\n");
+ ret = -EINVAL;
+ goto err_check_var;
+ }
+
+ vga16fb_update_fix(&vga16fb);
+
+ if (register_framebuffer(&vga16fb) < 0) {
+ printk(KERN_ERR "vga16fb: unable to register framebuffer\n");
+ ret = -EINVAL;
+ goto err_check_var;
+ }
+
+ printk(KERN_INFO "fb%d: %s frame buffer device\n",
+ vga16fb.node, vga16fb.fix.id);
+
+ return 0;
+
+ err_check_var:
+ fb_dealloc_cmap(&vga16fb.cmap);
+ err_alloc_cmap:
+ iounmap(vga16fb.screen_base);
+ err_ioremap:
+ return ret;
+}
+
+static void __exit vga16fb_exit(void)
+{
+ unregister_framebuffer(&vga16fb);
+ iounmap(vga16fb.screen_base);
+ fb_dealloc_cmap(&vga16fb.cmap);
+ /* XXX unshare VGA regions */
+}
+
+MODULE_LICENSE("GPL");
+module_init(vga16fb_init);
+module_exit(vga16fb_exit);
+
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
+
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