arkfb: new framebuffer driver for ARK Logic cards

This patch adds fbdev driver for graphics cards with ARK Logic 2000PV graphics
chip with ICS 5342 ramdac.

[adaplas@gmail.com: build fixes]
Signed-off-by: Ondrej Zajicek <santiago@crfreenet.org>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 1214 insertions, 0 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 7e5010dcaff5..9a256d2ff9dc 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1415,6 +1415,20 @@ config FB_TRIDENT_ACCEL
         This will compile the Trident frame buffer device with
         acceleration functions.
 
+config FB_ARK
+        tristate "ARK 2000PV support"
+        depends on FB && PCI
+        select FB_CFB_FILLRECT
+        select FB_CFB_COPYAREA
+        select FB_CFB_IMAGEBLIT
+        select FB_TILEBLITTING
+        select FB_SVGALIB
+        select VGASTATE
+        select FONT_8x16 if FRAMEBUFFER_CONSOLE
+        ---help---
+          Driver for PCI graphics boards with ARK 2000PV chip
+          and ICS 5342 RAMDAC.
+
 config FB_PM3
         tristate "Permedia3 support"
         depends on FB && PCI && BROKEN
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index c0c61468094d..0b70567458fb 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -59,6 +59,7 @@ obj-$(CONFIG_FB_CYBLA)            += cyblafb.o
 obj-$(CONFIG_FB_TRIDENT)          += tridentfb.o
 obj-$(CONFIG_FB_LE80578)          += vermilion/
 obj-$(CONFIG_FB_S3)               += s3fb.o
+obj-$(CONFIG_FB_ARK)              += arkfb.o
 obj-$(CONFIG_FB_STI)              += stifb.o
 obj-$(CONFIG_FB_FFB)              += ffb.o sbuslib.o
 obj-$(CONFIG_FB_CG6)              += cg6.o sbuslib.o
diff --git a/drivers/video/arkfb.c b/drivers/video/arkfb.c
new file mode 100644
index 000000000000..9288dd11dcef
--- /dev/null
+++ b/drivers/video/arkfb.c
@@ -0,0 +1,1199 @@
+/*
+ *  linux/drivers/video/arkfb.c -- Frame buffer device driver for ARK 2000PV
+ *  with ICS 5342 dac (it is easy to add support for different dacs).
+ *
+ *  Copyright (c) 2007 Ondrej Zajicek <santiago@crfreenet.org>
+ *
+ *  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.
+ *
+ *  Code is based on s3fb
+ */
+
+#include <linux/version.h>
+#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/svga.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/console.h> /* Why should fb driver call console functions? because acquire_console_sem() */
+#include <video/vga.h>
+
+#ifdef CONFIG_MTRR
+#include <asm/mtrr.h>
+#endif
+
+struct arkfb_info {
+        int mclk_freq;
+        int mtrr_reg;
+
+        struct dac_info *dac;
+        struct vgastate state;
+        struct mutex open_lock;
+        unsigned int ref_count;
+        u32 pseudo_palette[16];
+};
+
+
+/* ------------------------------------------------------------------------- */
+
+
+static const struct svga_fb_format arkfb_formats[] = {
+        { 0,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 0,
+                FB_TYPE_TEXT, FB_AUX_TEXT_SVGA_STEP4,   FB_VISUAL_PSEUDOCOLOR, 8, 8},
+        { 4,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 0,
+                FB_TYPE_PACKED_PIXELS, 0,               FB_VISUAL_PSEUDOCOLOR, 8, 16},
+        { 4,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 1,
+                FB_TYPE_INTERLEAVED_PLANES, 1,          FB_VISUAL_PSEUDOCOLOR, 8, 16},
+        { 8,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 0,
+                FB_TYPE_PACKED_PIXELS, 0,               FB_VISUAL_PSEUDOCOLOR, 8, 8},
+        {16,  {10, 5, 0}, {5, 5, 0},  {0, 5, 0}, {0, 0, 0}, 0,
+                FB_TYPE_PACKED_PIXELS, 0,               FB_VISUAL_TRUECOLOR, 4, 4},
+        {16,  {11, 5, 0}, {5, 6, 0},  {0, 5, 0}, {0, 0, 0}, 0,
+                FB_TYPE_PACKED_PIXELS, 0,               FB_VISUAL_TRUECOLOR, 4, 4},
+        {24,  {16, 8, 0}, {8, 8, 0},  {0, 8, 0}, {0, 0, 0}, 0,
+                FB_TYPE_PACKED_PIXELS, 0,               FB_VISUAL_TRUECOLOR, 8, 8},
+        {32,  {16, 8, 0}, {8, 8, 0},  {0, 8, 0}, {0, 0, 0}, 0,
+                FB_TYPE_PACKED_PIXELS, 0,               FB_VISUAL_TRUECOLOR, 2, 2},
+        SVGA_FORMAT_END
+};
+
+
+/* CRT timing register sets */
+
+static const struct vga_regset ark_h_total_regs[]        = {{0x00, 0, 7}, {0x41, 7, 7}, VGA_REGSET_END};
+static const struct vga_regset ark_h_display_regs[]      = {{0x01, 0, 7}, {0x41, 6, 6}, VGA_REGSET_END};
+static const struct vga_regset ark_h_blank_start_regs[]  = {{0x02, 0, 7}, {0x41, 5, 5}, VGA_REGSET_END};
+static const struct vga_regset ark_h_blank_end_regs[]    = {{0x03, 0, 4}, {0x05, 7, 7   }, VGA_REGSET_END};
+static const struct vga_regset ark_h_sync_start_regs[]   = {{0x04, 0, 7}, {0x41, 4, 4}, VGA_REGSET_END};
+static const struct vga_regset ark_h_sync_end_regs[]     = {{0x05, 0, 4}, VGA_REGSET_END};
+
+static const struct vga_regset ark_v_total_regs[]        = {{0x06, 0, 7}, {0x07, 0, 0}, {0x07, 5, 5}, {0x40, 7, 7}, VGA_REGSET_END};
+static const struct vga_regset ark_v_display_regs[]      = {{0x12, 0, 7}, {0x07, 1, 1}, {0x07, 6, 6}, {0x40, 6, 6}, VGA_REGSET_END};
+static const struct vga_regset ark_v_blank_start_regs[]  = {{0x15, 0, 7}, {0x07, 3, 3}, {0x09, 5, 5}, {0x40, 5, 5}, VGA_REGSET_END};
+// const struct vga_regset ark_v_blank_end_regs[]    = {{0x16, 0, 6}, VGA_REGSET_END};
+static const struct vga_regset ark_v_blank_end_regs[]    = {{0x16, 0, 7}, VGA_REGSET_END};
+static const struct vga_regset ark_v_sync_start_regs[]   = {{0x10, 0, 7}, {0x07, 2, 2}, {0x07, 7, 7}, {0x40, 4, 4}, VGA_REGSET_END};
+static const struct vga_regset ark_v_sync_end_regs[]     = {{0x11, 0, 3}, VGA_REGSET_END};
+
+static const struct vga_regset ark_line_compare_regs[]   = {{0x18, 0, 7}, {0x07, 4, 4}, {0x09, 6, 6}, VGA_REGSET_END};
+static const struct vga_regset ark_start_address_regs[]  = {{0x0d, 0, 7}, {0x0c, 0, 7}, {0x40, 0, 2}, VGA_REGSET_END};
+static const struct vga_regset ark_offset_regs[]         = {{0x13, 0, 7}, {0x41, 3, 3}, VGA_REGSET_END};
+
+static const struct svga_timing_regs ark_timing_regs     = {
+        ark_h_total_regs, ark_h_display_regs, ark_h_blank_start_regs,
+        ark_h_blank_end_regs, ark_h_sync_start_regs, ark_h_sync_end_regs,
+        ark_v_total_regs, ark_v_display_regs, ark_v_blank_start_regs,
+        ark_v_blank_end_regs, ark_v_sync_start_regs, ark_v_sync_end_regs,
+};
+
+
+/* ------------------------------------------------------------------------- */
+
+
+/* Module parameters */
+
+static char *mode = "640x480-8@60";
+
+#ifdef CONFIG_MTRR
+static int mtrr = 1;
+#endif
+
+MODULE_AUTHOR("(c) 2007 Ondrej Zajicek <santiago@crfreenet.org>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("fbdev driver for ARK 2000PV");
+
+module_param(mode, charp, 0444);
+MODULE_PARM_DESC(mode, "Default video mode ('640x480-8@60', etc)");
+
+#ifdef CONFIG_MTRR
+module_param(mtrr, int, 0444);
+MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)");
+#endif
+
+static int threshold = 4;
+
+module_param(threshold, int, 0644);
+MODULE_PARM_DESC(threshold, "FIFO threshold");
+
+
+/* ------------------------------------------------------------------------- */
+
+
+static void arkfb_settile(struct fb_info *info, struct fb_tilemap *map)
+{
+        const u8 *font = map->data;
+        u8 __iomem *fb = (u8 __iomem *)info->screen_base;
+        int i, c;
+
+        if ((map->width != 8) || (map->height != 16) ||
+            (map->depth != 1) || (map->length != 256)) {
+                printk(KERN_ERR "fb%d: unsupported font parameters: width %d, "
+                       "height %d, depth %d, length %d\n", info->node,
+                       map->width, map->height, map->depth, map->length);
+                return;
+        }
+
+        fb += 2;
+        for (c = 0; c < map->length; c++) {
+                for (i = 0; i < map->height; i++) {
+                        fb_writeb(font[i], &fb[i * 4]);
+                        fb_writeb(font[i], &fb[i * 4 + (128 * 8)]);
+                }
+                fb += 128;
+
+                if ((c % 8) == 7)
+                        fb += 128*8;
+
+                font += map->height;
+        }
+}
+
+static struct fb_tile_ops arkfb_tile_ops = {
+        .fb_settile     = arkfb_settile,
+        .fb_tilecopy    = svga_tilecopy,
+        .fb_tilefill    = svga_tilefill,
+        .fb_tileblit    = svga_tileblit,
+        .fb_tilecursor  = svga_tilecursor,
+        .fb_get_tilemax = svga_get_tilemax,
+};
+
+
+/* ------------------------------------------------------------------------- */
+
+
+/* image data is MSB-first, fb structure is MSB-first too */
+static inline u32 expand_color(u32 c)
+{
+        return ((c & 1) | ((c & 2) << 7) | ((c & 4) << 14) | ((c & 8) << 21)) * 0xFF;
+}
+
+/* arkfb_iplan_imageblit silently assumes that almost everything is 8-pixel aligned */
+static void arkfb_iplan_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+        u32 fg = expand_color(image->fg_color);
+        u32 bg = expand_color(image->bg_color);
+        const u8 *src1, *src;
+        u8 __iomem *dst1;
+        u32 __iomem *dst;
+        u32 val;
+        int x, y;
+
+        src1 = image->data;
+        dst1 = info->screen_base + (image->dy * info->fix.line_length)
+                 + ((image->dx / 8) * 4);
+
+        for (y = 0; y < image->height; y++) {
+                src = src1;
+                dst = (u32 __iomem *) dst1;
+                for (x = 0; x < image->width; x += 8) {
+                        val = *(src++) * 0x01010101;
+                        val = (val & fg) | (~val & bg);
+                        fb_writel(val, dst++);
+                }
+                src1 += image->width / 8;
+                dst1 += info->fix.line_length;
+        }
+
+}
+
+/* arkfb_iplan_fillrect silently assumes that almost everything is 8-pixel aligned */
+static void arkfb_iplan_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
+{
+        u32 fg = expand_color(rect->color);
+        u8 __iomem *dst1;
+        u32 __iomem *dst;
+        int x, y;
+
+        dst1 = info->screen_base + (rect->dy * info->fix.line_length)
+                 + ((rect->dx / 8) * 4);
+
+        for (y = 0; y < rect->height; y++) {
+                dst = (u32 __iomem *) dst1;
+                for (x = 0; x < rect->width; x += 8) {
+                        fb_writel(fg, dst++);
+                }
+                dst1 += info->fix.line_length;
+        }
+
+}
+
+
+/* image data is MSB-first, fb structure is high-nibble-in-low-byte-first */
+static inline u32 expand_pixel(u32 c)
+{
+        return (((c &  1) << 24) | ((c &  2) << 27) | ((c &  4) << 14) | ((c &   8) << 17) |
+                ((c & 16) <<  4) | ((c & 32) <<  7) | ((c & 64) >>  6) | ((c & 128) >>  3)) * 0xF;
+}
+
+/* arkfb_cfb4_imageblit silently assumes that almost everything is 8-pixel aligned */
+static void arkfb_cfb4_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+        u32 fg = image->fg_color * 0x11111111;
+        u32 bg = image->bg_color * 0x11111111;
+        const u8 *src1, *src;
+        u8 __iomem *dst1;
+        u32 __iomem *dst;
+        u32 val;
+        int x, y;
+
+        src1 = image->data;
+        dst1 = info->screen_base + (image->dy * info->fix.line_length)
+                 + ((image->dx / 8) * 4);
+
+        for (y = 0; y < image->height; y++) {
+                src = src1;
+                dst = (u32 __iomem *) dst1;
+                for (x = 0; x < image->width; x += 8) {
+                        val = expand_pixel(*(src++));
+                        val = (val & fg) | (~val & bg);
+                        fb_writel(val, dst++);
+                }
+                src1 += image->width / 8;
+                dst1 += info->fix.line_length;
+        }
+
+}
+
+static void arkfb_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+        if ((info->var.bits_per_pixel == 4) && (image->depth == 1)
+            && ((image->width % 8) == 0) && ((image->dx % 8) == 0)) {
+                if (info->fix.type == FB_TYPE_INTERLEAVED_PLANES)
+                        arkfb_iplan_imageblit(info, image);
+                else
+                        arkfb_cfb4_imageblit(info, image);
+        } else
+                cfb_imageblit(info, image);
+}
+
+static void arkfb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
+{
+        if ((info->var.bits_per_pixel == 4)
+            && ((rect->width % 8) == 0) && ((rect->dx % 8) == 0)
+            && (info->fix.type == FB_TYPE_INTERLEAVED_PLANES))
+                arkfb_iplan_fillrect(info, rect);
+         else
+                cfb_fillrect(info, rect);
+}
+
+
+/* ------------------------------------------------------------------------- */
+
+
+enum
+{
+        DAC_PSEUDO8_8,
+        DAC_RGB1555_8,
+        DAC_RGB0565_8,
+        DAC_RGB0888_8,
+        DAC_RGB8888_8,
+        DAC_PSEUDO8_16,
+        DAC_RGB1555_16,
+        DAC_RGB0565_16,
+        DAC_RGB0888_16,
+        DAC_RGB8888_16,
+        DAC_MAX
+};
+
+struct dac_ops {
+        int (*dac_get_mode)(struct dac_info *info);
+        int (*dac_set_mode)(struct dac_info *info, int mode);
+        int (*dac_get_freq)(struct dac_info *info, int channel);
+        int (*dac_set_freq)(struct dac_info *info, int channel, u32 freq);
+        void (*dac_release)(struct dac_info *info);
+};
+
+typedef void (*dac_read_regs_t)(void *data, u8 *code, int count);
+typedef void (*dac_write_regs_t)(void *data, u8 *code, int count);
+
+struct dac_info
+{
+        struct dac_ops *dacops;
+        dac_read_regs_t dac_read_regs;
+        dac_write_regs_t dac_write_regs;
+        void *data;
+};
+
+
+static inline u8 dac_read_reg(struct dac_info *info, u8 reg)
+{
+        u8 code[2] = {reg, 0};
+        info->dac_read_regs(info->data, code, 1);
+        return code[1];
+}
+
+static inline void dac_read_regs(struct dac_info *info, u8 *code, int count)
+{
+        info->dac_read_regs(info->data, code, count);
+}
+
+static inline void dac_write_reg(struct dac_info *info, u8 reg, u8 val)
+{
+        u8 code[2] = {reg, val};
+        info->dac_write_regs(info->data, code, 1);
+}
+
+static inline void dac_write_regs(struct dac_info *info, u8 *code, int count)
+{
+        info->dac_write_regs(info->data, code, count);
+}
+
+static inline int dac_set_mode(struct dac_info *info, int mode)
+{
+        return info->dacops->dac_set_mode(info, mode);
+}
+
+static inline int dac_set_freq(struct dac_info *info, int channel, u32 freq)
+{
+        return info->dacops->dac_set_freq(info, channel, freq);
+}
+
+static inline void dac_release(struct dac_info *info)
+{
+        info->dacops->dac_release(info);
+}
+
+
+/* ------------------------------------------------------------------------- */
+
+
+/* ICS5342 DAC */
+
+struct ics5342_info
+{
+        struct dac_info dac;
+        u8 mode;
+};
+
+#define DAC_PAR(info) ((struct ics5342_info *) info)
+
+/* LSB is set to distinguish unused slots */
+static const u8 ics5342_mode_table[DAC_MAX] = {
+        [DAC_PSEUDO8_8]  = 0x01, [DAC_RGB1555_8]  = 0x21, [DAC_RGB0565_8]  = 0x61,
+        [DAC_RGB0888_8]  = 0x41, [DAC_PSEUDO8_16] = 0x11, [DAC_RGB1555_16] = 0x31,
+        [DAC_RGB0565_16] = 0x51, [DAC_RGB0888_16] = 0x91, [DAC_RGB8888_16] = 0x71
+};
+
+static int ics5342_set_mode(struct dac_info *info, int mode)
+{
+        u8 code;
+
+        if (mode >= DAC_MAX)
+                return -EINVAL;
+
+        code = ics5342_mode_table[mode];
+
+        if (! code)
+                return -EINVAL;
+
+        dac_write_reg(info, 6, code & 0xF0);
+        DAC_PAR(info)->mode = mode;
+
+        return 0;
+}
+
+static const struct svga_pll ics5342_pll = {3, 129, 3, 33, 0, 3,
+        60000, 250000, 14318};
+
+/* pd4 - allow only posdivider 4 (r=2) */
+static const struct svga_pll ics5342_pll_pd4 = {3, 129, 3, 33, 2, 2,
+        60000, 335000, 14318};
+
+/* 270 MHz should be upper bound for VCO clock according to specs,
+   but that is too restrictive in pd4 case */
+
+static int ics5342_set_freq(struct dac_info *info, int channel, u32 freq)
+{
+        u16 m, n, r;
+
+        /* only postdivider 4 (r=2) is valid in mode DAC_PSEUDO8_16 */
+        int rv = svga_compute_pll((DAC_PAR(info)->mode == DAC_PSEUDO8_16)
+                                  ? &ics5342_pll_pd4 : &ics5342_pll,
+                                  freq, &m, &n, &r, 0);
+
+        if (rv < 0) {
+                return -EINVAL;
+        } else {
+                u8 code[6] = {4, 3, 5, m-2, 5, (n-2) | (r << 5)};
+                dac_write_regs(info, code, 3);
+                return 0;
+        }
+}
+
+static void ics5342_release(struct dac_info *info)
+{
+        ics5342_set_mode(info, DAC_PSEUDO8_8);
+        kfree(info);
+}
+
+static struct dac_ops ics5342_ops = {
+        .dac_set_mode   = ics5342_set_mode,
+        .dac_set_freq   = ics5342_set_freq,
+        .dac_release    = ics5342_release
+};
+
+
+static struct dac_info * ics5342_init(dac_read_regs_t drr, dac_write_regs_t dwr, void *data)
+{
+        struct dac_info *info = kzalloc(sizeof(struct ics5342_info), GFP_KERNEL);
+
+        if (! info)
+                return NULL;
+
+        info->dacops = &ics5342_ops;
+        info->dac_read_regs = drr;
+        info->dac_write_regs = dwr;
+        info->data = data;
+        DAC_PAR(info)->mode = DAC_PSEUDO8_8; /* estimation */
+        return info;
+}
+
+
+/* ------------------------------------------------------------------------- */
+
+
+static unsigned short dac_regs[4] = {0x3c8, 0x3c9, 0x3c6, 0x3c7};
+
+static void ark_dac_read_regs(void *data, u8 *code, int count)
+{
+        u8 regval = vga_rseq(NULL, 0x1C);
+
+        while (count != 0)
+        {
+                vga_wseq(NULL, 0x1C, regval | (code[0] & 4) ? 0x80 : 0);
+                code[1] = vga_r(NULL, dac_regs[code[0] & 3]);
+                count--;
+                code += 2;
+        }
+
+        vga_wseq(NULL, 0x1C, regval);
+}
+
+static void ark_dac_write_regs(void *data, u8 *code, int count)
+{
+        u8 regval = vga_rseq(NULL, 0x1C);
+
+        while (count != 0)
+        {
+                vga_wseq(NULL, 0x1C, regval | (code[0] & 4) ? 0x80 : 0);
+                vga_w(NULL, dac_regs[code[0] & 3], code[1]);
+                count--;
+                code += 2;
+        }
+
+        vga_wseq(NULL, 0x1C, regval);
+}
+
+
+static void ark_set_pixclock(struct fb_info *info, u32 pixclock)
+{
+        struct arkfb_info *par = info->par;
+        u8 regval;
+
+        int rv = dac_set_freq(par->dac, 0, 1000000000 / pixclock);
+        if (rv < 0) {
+                printk(KERN_ERR "fb%d: cannot set requested pixclock, keeping old value\n", info->node);
+                return;
+        }
+
+        /* Set VGA misc register  */
+        regval = vga_r(NULL, VGA_MIS_R);
+        vga_w(NULL, VGA_MIS_W, regval | VGA_MIS_ENB_PLL_LOAD);
+}
+
+
+/* Open framebuffer */
+
+static int arkfb_open(struct fb_info *info, int user)
+{
+        struct arkfb_info *par = info->par;
+
+        mutex_lock(&(par->open_lock));
+        if (par->ref_count == 0) {
+                memset(&(par->state), 0, sizeof(struct vgastate));
+                par->state.flags = VGA_SAVE_MODE | VGA_SAVE_FONTS | VGA_SAVE_CMAP;
+                par->state.num_crtc = 0x60;
+                par->state.num_seq = 0x30;
+                save_vga(&(par->state));
+        }
+
+        par->ref_count++;
+        mutex_unlock(&(par->open_lock));
+
+        return 0;
+}
+
+/* Close framebuffer */
+
+static int arkfb_release(struct fb_info *info, int user)
+{
+        struct arkfb_info *par = info->par;
+
+        mutex_lock(&(par->open_lock));
+        if (par->ref_count == 0) {
+                mutex_unlock(&(par->open_lock));
+                return -EINVAL;
+        }
+
+        if (par->ref_count == 1) {
+                restore_vga(&(par->state));
+                dac_set_mode(par->dac, DAC_PSEUDO8_8);
+        }
+
+        par->ref_count--;
+        mutex_unlock(&(par->open_lock));
+
+        return 0;
+}
+
+/* Validate passed in var */
+
+static int arkfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+        int rv, mem, step;
+
+        /* Find appropriate format */
+        rv = svga_match_format (arkfb_formats, var, NULL);
+        if (rv < 0)
+        {
+                printk(KERN_ERR "fb%d: unsupported mode requested\n", info->node);
+                return rv;
+        }
+
+        /* Do not allow to have real resoulution larger than virtual */
+        if (var->xres > var->xres_virtual)
+                var->xres_virtual = var->xres;
+
+        if (var->yres > var->yres_virtual)
+                var->yres_virtual = var->yres;
+
+        /* Round up xres_virtual to have proper alignment of lines */
+        step = arkfb_formats[rv].xresstep - 1;
+        var->xres_virtual = (var->xres_virtual+step) & ~step;
+
+
+        /* Check whether have enough memory */
+        mem = ((var->bits_per_pixel * var->xres_virtual) >> 3) * var->yres_virtual;
+        if (mem > info->screen_size)
+        {
+                printk(KERN_ERR "fb%d: not enough framebuffer memory (%d kB requested , %d kB available)\n", info->node, mem >> 10, (unsigned int) (info->screen_size >> 10));
+                return -EINVAL;
+        }
+
+        rv = svga_check_timings (&ark_timing_regs, var, info->node);
+        if (rv < 0)
+        {
+                printk(KERN_ERR "fb%d: invalid timings requested\n", info->node);
+                return rv;
+        }
+
+        /* Interlaced mode is broken */
+        if (var->vmode & FB_VMODE_INTERLACED)
+                return -EINVAL;
+
+        return 0;
+}
+
+/* Set video mode from par */
+
+static int arkfb_set_par(struct fb_info *info)
+{
+        struct arkfb_info *par = info->par;
+        u32 value, mode, hmul, hdiv, offset_value, screen_size;
+        u32 bpp = info->var.bits_per_pixel;
+        u8 regval;
+
+        if (bpp != 0) {
+                info->fix.ypanstep = 1;
+                info->fix.line_length = (info->var.xres_virtual * bpp) / 8;
+
+                info->flags &= ~FBINFO_MISC_TILEBLITTING;
+                info->tileops = NULL;
+
+                /* in 4bpp supports 8p wide tiles only, any tiles otherwise */
+                info->pixmap.blit_x = (bpp == 4) ? (1 << (8 - 1)) : (~(u32)0);
+                info->pixmap.blit_y = ~(u32)0;
+
+                offset_value = (info->var.xres_virtual * bpp) / 64;
+                screen_size = info->var.yres_virtual * info->fix.line_length;
+        } else {
+                info->fix.ypanstep = 16;
+                info->fix.line_length = 0;
+
+                info->flags |= FBINFO_MISC_TILEBLITTING;
+                info->tileops = &arkfb_tile_ops;
+
+                /* supports 8x16 tiles only */
+                info->pixmap.blit_x = 1 << (8 - 1);
+                info->pixmap.blit_y = 1 << (16 - 1);
+
+                offset_value = info->var.xres_virtual / 16;
+                screen_size = (info->var.xres_virtual * info->var.yres_virtual) / 64;
+        }
+
+        info->var.xoffset = 0;
+        info->var.yoffset = 0;
+        info->var.activate = FB_ACTIVATE_NOW;
+
+        /* Unlock registers */
+        svga_wcrt_mask(0x11, 0x00, 0x80);
+
+        /* Blank screen and turn off sync */
+        svga_wseq_mask(0x01, 0x20, 0x20);
+        svga_wcrt_mask(0x17, 0x00, 0x80);
+
+        /* Set default values */
+        svga_set_default_gfx_regs();
+        svga_set_default_atc_regs();
+        svga_set_default_seq_regs();
+        svga_set_default_crt_regs();
+        svga_wcrt_multi(ark_line_compare_regs, 0xFFFFFFFF);
+        svga_wcrt_multi(ark_start_address_regs, 0);
+
+        /* ARK specific initialization */
+        svga_wseq_mask(0x10, 0x1F, 0x1F); /* enable linear framebuffer and full memory access */
+        svga_wseq_mask(0x12, 0x03, 0x03); /* 4 MB linear framebuffer size */
+
+        vga_wseq(NULL, 0x13, info->fix.smem_start >> 16);
+        vga_wseq(NULL, 0x14, info->fix.smem_start >> 24);
+        vga_wseq(NULL, 0x15, 0);
+        vga_wseq(NULL, 0x16, 0);
+
+        /* Set the FIFO threshold register */
+        /* It is fascinating way to store 5-bit value in 8-bit register */
+        regval = 0x10 | ((threshold & 0x0E) >> 1) | (threshold & 0x01) << 7 | (threshold & 0x10) << 1;
+        vga_wseq(NULL, 0x18, regval);
+
+        /* Set the offset register */
+        pr_debug("fb%d: offset register       : %d\n", info->node, offset_value);
+        svga_wcrt_multi(ark_offset_regs, offset_value);
+
+        /* fix for hi-res textmode */
+        svga_wcrt_mask(0x40, 0x08, 0x08);
+
+        if (info->var.vmode & FB_VMODE_DOUBLE)
+                svga_wcrt_mask(0x09, 0x80, 0x80);
+        else
+                svga_wcrt_mask(0x09, 0x00, 0x80);
+
+        if (info->var.vmode & FB_VMODE_INTERLACED)
+                svga_wcrt_mask(0x44, 0x04, 0x04);
+        else
+                svga_wcrt_mask(0x44, 0x00, 0x04);
+
+        hmul = 1;
+        hdiv = 1;
+        mode = svga_match_format(arkfb_formats, &(info->var), &(info->fix));
+
+        /* Set mode-specific register values */
+        switch (mode) {
+        case 0:
+                pr_debug("fb%d: text mode\n", info->node);
+                svga_set_textmode_vga_regs();
+
+                vga_wseq(NULL, 0x11, 0x10); /* basic VGA mode */
+                svga_wcrt_mask(0x46, 0x00, 0x04); /* 8bit pixel path */
+                dac_set_mode(par->dac, DAC_PSEUDO8_8);
+
+                break;
+        case 1:
+                pr_debug("fb%d: 4 bit pseudocolor\n", info->node);
+                vga_wgfx(NULL, VGA_GFX_MODE, 0x40);
+
+                vga_wseq(NULL, 0x11, 0x10); /* basic VGA mode */
+                svga_wcrt_mask(0x46, 0x00, 0x04); /* 8bit pixel path */
+                dac_set_mode(par->dac, DAC_PSEUDO8_8);
+                break;
+        case 2:
+                pr_debug("fb%d: 4 bit pseudocolor, planar\n", info->node);
+
+                vga_wseq(NULL, 0x11, 0x10); /* basic VGA mode */
+                svga_wcrt_mask(0x46, 0x00, 0x04); /* 8bit pixel path */
+                dac_set_mode(par->dac, DAC_PSEUDO8_8);
+                break;
+        case 3:
+                pr_debug("fb%d: 8 bit pseudocolor\n", info->node);
+
+                vga_wseq(NULL, 0x11, 0x16); /* 8bpp accel mode */
+
+                if (info->var.pixclock > 20000) {
+                        pr_debug("fb%d: not using multiplex\n", info->node);
+                        svga_wcrt_mask(0x46, 0x00, 0x04); /* 8bit pixel path */
+                        dac_set_mode(par->dac, DAC_PSEUDO8_8);
+                } else {
+                        pr_debug("fb%d: using multiplex\n", info->node);
+                        svga_wcrt_mask(0x46, 0x04, 0x04); /* 16bit pixel path */
+                        dac_set_mode(par->dac, DAC_PSEUDO8_16);
+                        hdiv = 2;
+                }
+                break;
+        case 4:
+                pr_debug("fb%d: 5/5/5 truecolor\n", info->node);
+
+                vga_wseq(NULL, 0x11, 0x1A); /* 16bpp accel mode */
+                svga_wcrt_mask(0x46, 0x04, 0x04); /* 16bit pixel path */
+                dac_set_mode(par->dac, DAC_RGB1555_16);
+                break;
+        case 5:
+                pr_debug("fb%d: 5/6/5 truecolor\n", info->node);
+
+                vga_wseq(NULL, 0x11, 0x1A); /* 16bpp accel mode */
+                svga_wcrt_mask(0x46, 0x04, 0x04); /* 16bit pixel path */
+                dac_set_mode(par->dac, DAC_RGB0565_16);
+                break;
+        case 6:
+                pr_debug("fb%d: 8/8/8 truecolor\n", info->node);
+
+                vga_wseq(NULL, 0x11, 0x16); /* 8bpp accel mode ??? */
+                svga_wcrt_mask(0x46, 0x04, 0x04); /* 16bit pixel path */
+                dac_set_mode(par->dac, DAC_RGB0888_16);
+                hmul = 3;
+                hdiv = 2;
+                break;
+        case 7:
+                pr_debug("fb%d: 8/8/8/8 truecolor\n", info->node);
+
+                vga_wseq(NULL, 0x11, 0x1E); /* 32bpp accel mode */
+                svga_wcrt_mask(0x46, 0x04, 0x04); /* 16bit pixel path */
+                dac_set_mode(par->dac, DAC_RGB8888_16);
+                hmul = 2;
+                break;
+        default:
+                printk(KERN_ERR "fb%d: unsupported mode - bug\n", info->node);
+                return -EINVAL;
+        }
+
+        ark_set_pixclock(info, (hdiv * info->var.pixclock) / hmul);
+        svga_set_timings(&ark_timing_regs, &(info->var), hmul, hdiv,
+                         (info->var.vmode & FB_VMODE_DOUBLE)     ? 2 : 1,
+                         (info->var.vmode & FB_VMODE_INTERLACED) ? 2 : 1,
+                          hmul, info->node);
+
+        /* Set interlaced mode start/end register */
+        value = info->var.xres + info->var.left_margin + info->var.right_margin + info->var.hsync_len;
+        value = ((value * hmul / hdiv) / 8) - 5;
+        vga_wcrt(NULL, 0x42, (value + 1) / 2);
+
+        memset_io(info->screen_base, 0x00, screen_size);
+        /* Device and screen back on */
+        svga_wcrt_mask(0x17, 0x80, 0x80);
+        svga_wseq_mask(0x01, 0x00, 0x20);
+
+        return 0;
+}
+
+/* Set a colour register */
+
+static int arkfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+                                u_int transp, struct fb_info *fb)
+{
+        switch (fb->var.bits_per_pixel) {
+        case 0:
+        case 4:
+                if (regno >= 16)
+                        return -EINVAL;
+
+                if ((fb->var.bits_per_pixel == 4) &&
+                    (fb->var.nonstd == 0)) {
+                        outb(0xF0, VGA_PEL_MSK);
+                        outb(regno*16, VGA_PEL_IW);
+                } else {
+                        outb(0x0F, VGA_PEL_MSK);
+                        outb(regno, VGA_PEL_IW);
+                }
+                outb(red >> 10, VGA_PEL_D);
+                outb(green >> 10, VGA_PEL_D);
+                outb(blue >> 10, VGA_PEL_D);
+                break;
+        case 8:
+                if (regno >= 256)
+                        return -EINVAL;
+
+                outb(0xFF, VGA_PEL_MSK);
+                outb(regno, VGA_PEL_IW);
+                outb(red >> 10, VGA_PEL_D);
+                outb(green >> 10, VGA_PEL_D);
+                outb(blue >> 10, VGA_PEL_D);
+                break;
+        case 16:
+                if (regno >= 16)
+                        return 0;
+
+                if (fb->var.green.length == 5)
+                        ((u32*)fb->pseudo_palette)[regno] = ((red & 0xF800) >> 1) |
+                                ((green & 0xF800) >> 6) | ((blue & 0xF800) >> 11);
+                else if (fb->var.green.length == 6)
+                        ((u32*)fb->pseudo_palette)[regno] = (red & 0xF800) |
+                                ((green & 0xFC00) >> 5) | ((blue & 0xF800) >> 11);
+                else
+                        return -EINVAL;
+                break;
+        case 24:
+        case 32:
+                if (regno >= 16)
+                        return 0;
+
+                ((u32*)fb->pseudo_palette)[regno] = ((red & 0xFF00) << 8) |
+                        (green & 0xFF00) | ((blue & 0xFF00) >> 8);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+/* Set the display blanking state */
+
+static int arkfb_blank(int blank_mode, struct fb_info *info)
+{
+        switch (blank_mode) {
+        case FB_BLANK_UNBLANK:
+                pr_debug("fb%d: unblank\n", info->node);
+                svga_wseq_mask(0x01, 0x00, 0x20);
+                svga_wcrt_mask(0x17, 0x80, 0x80);
+                break;
+        case FB_BLANK_NORMAL:
+                pr_debug("fb%d: blank\n", info->node);
+                svga_wseq_mask(0x01, 0x20, 0x20);
+                svga_wcrt_mask(0x17, 0x80, 0x80);
+                break;
+        case FB_BLANK_POWERDOWN:
+        case FB_BLANK_HSYNC_SUSPEND:
+        case FB_BLANK_VSYNC_SUSPEND:
+                pr_debug("fb%d: sync down\n", info->node);
+                svga_wseq_mask(0x01, 0x20, 0x20);
+                svga_wcrt_mask(0x17, 0x00, 0x80);
+                break;
+        }
+        return 0;
+}
+
+
+/* Pan the display */
+
+static int arkfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+        unsigned int offset;
+
+        /* Calculate the offset */
+        if (var->bits_per_pixel == 0) {
+                offset = (var->yoffset / 16) * (var->xres_virtual / 2) + (var->xoffset / 2);
+                offset = offset >> 2;
+        } else {
+                offset = (var->yoffset * info->fix.line_length) +
+                         (var->xoffset * var->bits_per_pixel / 8);
+                offset = offset >> ((var->bits_per_pixel == 4) ? 2 : 3);
+        }
+
+        /* Set the offset */
+        svga_wcrt_multi(ark_start_address_regs, offset);
+
+        return 0;
+}
+
+
+/* ------------------------------------------------------------------------- */
+
+
+/* Frame buffer operations */
+
+static struct fb_ops arkfb_ops = {
+        .owner          = THIS_MODULE,
+        .fb_open        = arkfb_open,
+        .fb_release     = arkfb_release,
+        .fb_check_var   = arkfb_check_var,
+        .fb_set_par     = arkfb_set_par,
+        .fb_setcolreg   = arkfb_setcolreg,
+        .fb_blank       = arkfb_blank,
+        .fb_pan_display = arkfb_pan_display,
+        .fb_fillrect    = arkfb_fillrect,
+        .fb_copyarea    = cfb_copyarea,
+        .fb_imageblit   = arkfb_imageblit,
+};
+
+
+/* ------------------------------------------------------------------------- */
+
+
+/* PCI probe */
+static int __devinit ark_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+        struct fb_info *info;
+        struct arkfb_info *par;
+        int rc;
+        u8 regval;
+
+        /* Ignore secondary VGA device because there is no VGA arbitration */
+        if (! svga_primary_device(dev)) {
+                dev_info(&(dev->dev), "ignoring secondary device\n");
+                return -ENODEV;
+        }
+
+        /* Allocate and fill driver data structure */
+        info = framebuffer_alloc(sizeof(struct arkfb_info), NULL);
+        if (! info) {
+                dev_err(&(dev->dev), "cannot allocate memory\n");
+                return -ENOMEM;
+        }
+
+        par = info->par;
+        mutex_init(&par->open_lock);
+
+        info->flags = FBINFO_PARTIAL_PAN_OK | FBINFO_HWACCEL_YPAN;
+        info->fbops = &arkfb_ops;
+
+        /* Prepare PCI device */
+        rc = pci_enable_device(dev);
+        if (rc < 0) {
+                dev_err(&(dev->dev), "cannot enable PCI device\n");
+                goto err_enable_device;
+        }
+
+        rc = pci_request_regions(dev, "arkfb");
+        if (rc < 0) {
+                dev_err(&(dev->dev), "cannot reserve framebuffer region\n");
+                goto err_request_regions;
+        }
+
+        par->dac = ics5342_init(ark_dac_read_regs, ark_dac_write_regs, info);
+        if (! par->dac) {
+                rc = -ENOMEM;
+                dev_err(&(dev->dev), "RAMDAC initialization failed\n");
+                goto err_dac;
+        }
+
+        info->fix.smem_start = pci_resource_start(dev, 0);
+        info->fix.smem_len = pci_resource_len(dev, 0);
+
+        /* Map physical IO memory address into kernel space */
+        info->screen_base = pci_iomap(dev, 0, 0);
+        if (! info->screen_base) {
+                rc = -ENOMEM;
+                dev_err(&(dev->dev), "iomap for framebuffer failed\n");
+                goto err_iomap;
+        }
+
+        /* FIXME get memsize */
+        regval = vga_rseq(NULL, 0x10);
+        info->screen_size = (1 << (regval >> 6)) << 20;
+        info->fix.smem_len = info->screen_size;
+
+        strcpy(info->fix.id, "ARK 2000PV");
+        info->fix.mmio_start = 0;
+        info->fix.mmio_len = 0;
+        info->fix.type = FB_TYPE_PACKED_PIXELS;
+        info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+        info->fix.ypanstep = 0;
+        info->fix.accel = FB_ACCEL_NONE;
+        info->pseudo_palette = (void*) (par->pseudo_palette);
+
+        /* Prepare startup mode */
+        rc = fb_find_mode(&(info->var), info, mode, NULL, 0, NULL, 8);
+        if (! ((rc == 1) || (rc == 2))) {
+                rc = -EINVAL;
+                dev_err(&(dev->dev), "mode %s not found\n", mode);
+                goto err_find_mode;
+        }
+
+        rc = fb_alloc_cmap(&info->cmap, 256, 0);
+        if (rc < 0) {
+                dev_err(&(dev->dev), "cannot allocate colormap\n");
+                goto err_alloc_cmap;
+        }
+
+        rc = register_framebuffer(info);
+        if (rc < 0) {
+                dev_err(&(dev->dev), "cannot register framebugger\n");
+                goto err_reg_fb;
+        }
+
+        printk(KERN_INFO "fb%d: %s on %s, %d MB RAM\n", info->node, info->fix.id,
+                 pci_name(dev), info->fix.smem_len >> 20);
+
+        /* Record a reference to the driver data */
+        pci_set_drvdata(dev, info);
+
+#ifdef CONFIG_MTRR
+        if (mtrr) {
+                par->mtrr_reg = -1;
+                par->mtrr_reg = mtrr_add(info->fix.smem_start, info->fix.smem_len, MTRR_TYPE_WRCOMB, 1);
+        }
+#endif
+
+        return 0;
+
+        /* Error handling */
+err_reg_fb:
+        fb_dealloc_cmap(&info->cmap);
+err_alloc_cmap:
+err_find_mode:
+        pci_iounmap(dev, info->screen_base);
+err_iomap:
+        dac_release(par->dac);
+err_dac:
+        pci_release_regions(dev);
+err_request_regions:
+/*      pci_disable_device(dev); */
+err_enable_device:
+        framebuffer_release(info);
+        return rc;
+}
+
+/* PCI remove */
+
+static void __devexit ark_pci_remove(struct pci_dev *dev)
+{
+        struct fb_info *info = pci_get_drvdata(dev);
+        struct arkfb_info *par = info->par;
+
+        if (info) {
+#ifdef CONFIG_MTRR
+                if (par->mtrr_reg >= 0) {
+                        mtrr_del(par->mtrr_reg, 0, 0);
+                        par->mtrr_reg = -1;
+                }
+#endif
+
+                dac_release(par->dac);
+                unregister_framebuffer(info);
+                fb_dealloc_cmap(&info->cmap);
+
+                pci_iounmap(dev, info->screen_base);
+                pci_release_regions(dev);
+/*              pci_disable_device(dev); */
+
+                pci_set_drvdata(dev, NULL);
+                framebuffer_release(info);
+        }
+}
+
+
+#ifdef CONFIG_PM
+/* PCI suspend */
+
+static int ark_pci_suspend (struct pci_dev* dev, pm_message_t state)
+{
+        struct fb_info *info = pci_get_drvdata(dev);
+        struct arkfb_info *par = info->par;
+
+        dev_info(&(dev->dev), "suspend\n");
+
+        acquire_console_sem();
+        mutex_lock(&(par->open_lock));
+
+        if ((state.event == PM_EVENT_FREEZE) || (par->ref_count == 0)) {
+                mutex_unlock(&(par->open_lock));
+                release_console_sem();
+                return 0;
+        }
+
+        fb_set_suspend(info, 1);
+
+        pci_save_state(dev);
+        pci_disable_device(dev);
+        pci_set_power_state(dev, pci_choose_state(dev, state));
+
+        mutex_unlock(&(par->open_lock));
+        release_console_sem();
+
+        return 0;
+}
+
+
+/* PCI resume */
+
+static int ark_pci_resume (struct pci_dev* dev)
+{
+        struct fb_info *info = pci_get_drvdata(dev);
+        struct arkfb_info *par = info->par;
+
+        dev_info(&(dev->dev), "resume\n");
+
+        acquire_console_sem();
+        mutex_lock(&(par->open_lock));
+
+        if (par->ref_count == 0) {
+                mutex_unlock(&(par->open_lock));
+                release_console_sem();
+                return 0;
+        }
+
+        pci_set_power_state(dev, PCI_D0);
+        pci_restore_state(dev);
+
+        if (pci_enable_device(dev))
+                goto fail;
+
+        pci_set_master(dev);
+
+        arkfb_set_par(info);
+        fb_set_suspend(info, 0);
+
+        mutex_unlock(&(par->open_lock));
+fail:
+        release_console_sem();
+        return 0;
+}
+#else
+#define ark_pci_suspend NULL
+#define ark_pci_resume NULL
+#endif /* CONFIG_PM */
+
+/* List of boards that we are trying to support */
+
+static struct pci_device_id ark_devices[] __devinitdata = {
+        {PCI_DEVICE(0xEDD8, 0xA099)},
+        {0, 0, 0, 0, 0, 0, 0}
+};
+
+
+MODULE_DEVICE_TABLE(pci, ark_devices);
+
+static struct pci_driver arkfb_pci_driver = {
+        .name           = "arkfb",
+        .id_table       = ark_devices,
+        .probe          = ark_pci_probe,
+        .remove         = __devexit_p(ark_pci_remove),
+        .suspend        = ark_pci_suspend,
+        .resume         = ark_pci_resume,
+};
+
+/* Cleanup */
+
+static void __exit arkfb_cleanup(void)
+{
+        pr_debug("arkfb: cleaning up\n");
+        pci_unregister_driver(&arkfb_pci_driver);
+}
+
+/* Driver Initialisation */
+
+static int __init arkfb_init(void)
+{
+
+#ifndef MODULE
+        char *option = NULL;
+
+        if (fb_get_options("arkfb", &option))
+                return -ENODEV;
+
+        if (option && *option)
+                mode = option;
+#endif
+
+        pr_debug("arkfb: initializing\n");
+        return pci_register_driver(&arkfb_pci_driver);
+}
+
+module_init(arkfb_init);
+module_exit(arkfb_cleanup);