patch-2.4.7 linux/drivers/video/pvr2fb.c
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- Lines: 1172
- Date:
Tue Jul 10 20:16:30 2001
- Orig file:
v2.4.6/linux/drivers/video/pvr2fb.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.6/linux/drivers/video/pvr2fb.c linux/drivers/video/pvr2fb.c
@@ -0,0 +1,1171 @@
+/* drivers/video/pvr2fb.c
+ *
+ * Frame buffer and fbcon support for the NEC PowerVR2 found within the Sega
+ * Dreamcast.
+ *
+ * Copyright (c) 2001 M. R. Brown <mrbrown@0xd6.org>
+ * Copyright (c) 2001 Paul Mundt <lethal@chaoticdreams.org>
+ *
+ * This file is part of the LinuxDC project (linuxdc.sourceforge.net).
+ *
+ */
+
+/*
+ * This driver is mostly based on the excellent amifb and vfb sources. It uses
+ * an odd scheme for converting hardware values to/from framebuffer values, here are
+ * some hacked-up formulas:
+ *
+ * The Dreamcast has screen offsets from each side of it's four borders and the start
+ * offsets of the display window. I used these values to calculate 'pseudo' values
+ * (think of them as placeholders) for the fb video mode, so that when it came time
+ * to convert these values back into their hardware values, I could just add mode-
+ * specific offsets to get the correct mode settings:
+ *
+ * left_margin = diwstart_h - borderstart_h;
+ * right_margin = borderstop_h - (diwstart_h + xres);
+ * upper_margin = diwstart_v - borderstart_v;
+ * lower_margin = borderstop_v - (diwstart_h + yres);
+ *
+ * hsync_len = borderstart_h + (hsync_total - borderstop_h);
+ * vsync_len = borderstart_v + (vsync_total - borderstop_v);
+ *
+ * Then, when it's time to convert back to hardware settings, the only constants
+ * are the borderstart_* offsets, all other values are derived from the fb video
+ * mode:
+ *
+ * // PAL
+ * borderstart_h = 116;
+ * borderstart_v = 44;
+ * ...
+ * borderstop_h = borderstart_h + hsync_total - hsync_len;
+ * ...
+ * diwstart_v = borderstart_v - upper_margin;
+ *
+ * However, in the current implementation, the borderstart values haven't had
+ * the benefit of being fully researched, so some modes may be broken.
+ */
+
+#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/malloc.h>
+#include <linux/delay.h>
+#include <linux/config.h>
+#include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/console.h>
+
+#ifdef CONFIG_SH_DREAMCAST
+#include <asm/io.h>
+#include <asm/machvec.h>
+#include <asm/dc_sysasic.h>
+#endif
+
+#ifdef CONFIG_MTRR
+ #include <asm/mtrr.h>
+#endif
+
+#include <video/fbcon.h>
+#include <video/fbcon-cfb16.h>
+#include <video/fbcon-cfb24.h>
+#include <video/fbcon-cfb32.h>
+
+#ifdef CONFIG_FB_PVR2_DEBUG
+# define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
+#else
+# define DPRINTK(fmt, args...)
+#endif
+
+/* 2D video registers */
+#define DISP_BASE 0xa05f8000
+
+#define DISP_BRDRCOLR (DISP_BASE + 0x40)
+#define DISP_DIWMODE (DISP_BASE + 0x44)
+#define DISP_DIWADDRL (DISP_BASE + 0x50)
+#define DISP_DIWADDRS (DISP_BASE + 0x54)
+#define DISP_DIWSIZE (DISP_BASE + 0x5c)
+#define DISP_SYNCCONF (DISP_BASE + 0xd0)
+#define DISP_BRDRHORZ (DISP_BASE + 0xd4)
+#define DISP_SYNCSIZE (DISP_BASE + 0xd8)
+#define DISP_BRDRVERT (DISP_BASE + 0xdc)
+#define DISP_DIWCONF (DISP_BASE + 0xe8)
+#define DISP_DIWHSTRT (DISP_BASE + 0xec)
+#define DISP_DIWVSTRT (DISP_BASE + 0xf0)
+
+/* Pixel clocks, one for TV output, doubled for VGA output */
+#define TV_CLK 74239
+#define VGA_CLK 37119
+
+/* This is for 60Hz - the VTOTAL is doubled for interlaced modes */
+#define PAL_HTOTAL 863
+#define PAL_VTOTAL 312
+#define NTSC_HTOTAL 857
+#define NTSC_VTOTAL 262
+
+enum { CT_VGA, CT_NONE, CT_RGB, CT_COMPOSITE };
+
+enum { VO_PAL, VO_NTSC, VO_VGA };
+
+struct pvr2_params { u_short val; char *name; };
+static struct pvr2_params cables[] __initdata = {
+ { CT_VGA, "VGA" }, { CT_RGB, "RGB" }, { CT_COMPOSITE, "COMPOSITE" },
+};
+
+static struct pvr2_params outputs[] __initdata = {
+ { VO_PAL, "PAL" }, { VO_NTSC, "NTSC" }, { VO_VGA, "VGA" },
+};
+
+/*
+ * This describes the current video mode
+ */
+
+static struct pvr2fb_par {
+
+ int xres;
+ int yres;
+ int vxres;
+ int vyres;
+ int xoffset;
+ int yoffset;
+ u_short bpp;
+
+ u_long pixclock;
+ u_short hsync_total; /* Clocks/line */
+ u_short vsync_total; /* Lines/field */
+ u_short borderstart_h;
+ u_short borderstop_h;
+ u_short borderstart_v;
+ u_short borderstop_v;
+ u_short diwstart_h; /* Horizontal offset of the display field */
+ u_short diwstart_v; /* Vertical offset of the display field, for
+ interlaced modes, this is the long field */
+ u_long disp_start; /* Address of image within VRAM */
+
+ u_long next_line; /* Modulo for next line */
+
+ u_char is_interlaced; /* Is the display interlaced? */
+ u_char is_doublescan; /* Are scanlines output twice? (doublescan) */
+ u_char is_lowres; /* Is horizontal pixel-doubling enabled? */
+
+ u_long bordercolor; /* RGB888 format border color */
+
+ u_long vmode;
+
+} currentpar;
+
+static int currcon = 0;
+static int currbpp;
+static struct display disp;
+static struct fb_info fb_info;
+static int pvr2fb_inverse = 0;
+
+static struct { u_short red, green, blue, alpha; } palette[256];
+static union {
+#ifdef FBCON_HAS_CFB16
+ u16 cfb16[16];
+#endif
+#ifdef FBCON_HAS_CFB24
+ u32 cfb24[16];
+#endif
+#ifdef FBCON_HAS_CFB32
+ u32 cfb32[16];
+#endif
+} fbcon_cmap;
+
+static char pvr2fb_name[16] = "NEC PowerVR2";
+
+#define VIDEOMEMSIZE (8*1024*1024)
+static u_long videomemory = 0xa5000000, videomemorysize = VIDEOMEMSIZE;
+static int cable_type = -1;
+static int video_output = -1;
+
+#ifdef CONFIG_MTRR
+static int enable_mtrr = 1;
+static int mtrr_handle;
+#endif
+
+/*
+ * We do all updating, blanking, etc. during the vertical retrace period
+ */
+
+static u_short do_vmode_full = 0; /* Change the video mode */
+static u_short do_vmode_pan = 0; /* Update the video mode */
+static short do_blank = 0; /* (Un)Blank the screen */
+
+static u_short is_blanked = 0; /* Is the screen blanked? */
+
+/* Interface used by the world */
+
+int pvr2fb_setup(char*);
+
+static int pvr2fb_get_fix(struct fb_fix_screeninfo *fix, int con,
+ struct fb_info *info);
+static int pvr2fb_get_var(struct fb_var_screeninfo *var, int con,
+ struct fb_info *info);
+static int pvr2fb_set_var(struct fb_var_screeninfo *var, int con,
+ struct fb_info *info);
+static int pvr2fb_pan_display(struct fb_var_screeninfo *var, int con,
+ struct fb_info *info);
+static int pvr2fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
+ struct fb_info *info);
+static int pvr2fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
+ struct fb_info *info);
+
+ /*
+ * Interface to the low level console driver
+ */
+
+static int pvr2fbcon_switch(int con, struct fb_info *info);
+static int pvr2fbcon_updatevar(int con, struct fb_info *info);
+static void pvr2fbcon_blank(int blank, struct fb_info *info);
+
+ /*
+ * Internal/hardware-specific routines
+ */
+
+static void do_install_cmap(int con, struct fb_info *info);
+static u_long get_line_length(int xres_virtual, int bpp);
+static void set_color_bitfields(struct fb_var_screeninfo *var);
+static int pvr2_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
+ u_int *transp, struct fb_info *info);
+static int pvr2_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int transp, struct fb_info *info);
+
+static int pvr2_encode_fix(struct fb_fix_screeninfo *fix,
+ struct pvr2fb_par *par);
+static int pvr2_decode_var(struct fb_var_screeninfo *var,
+ struct pvr2fb_par *par);
+static int pvr2_encode_var(struct fb_var_screeninfo *var,
+ struct pvr2fb_par *par);
+static void pvr2_get_par(struct pvr2fb_par *par);
+static void pvr2_set_var(struct fb_var_screeninfo *var);
+static void pvr2_pan_var(struct fb_var_screeninfo *var);
+static int pvr2_update_par(void);
+static void pvr2_update_display(void);
+static void pvr2_init_display(void);
+static void pvr2_do_blank(void);
+static void pvr2fb_interrupt(int irq, void *dev_id, struct pt_regs *fp);
+static int pvr2_init_cable(void);
+static int pvr2_get_param(const struct pvr2_params *p, const char *s,
+ int val, int size);
+
+static struct fb_ops pvr2fb_ops = {
+ owner: THIS_MODULE,
+ fb_get_fix: pvr2fb_get_fix,
+ fb_get_var: pvr2fb_get_var,
+ fb_set_var: pvr2fb_set_var,
+ fb_get_cmap: pvr2fb_get_cmap,
+ fb_set_cmap: pvr2fb_set_cmap,
+ fb_pan_display: pvr2fb_pan_display,
+};
+
+static struct fb_videomode pvr2_modedb[] __initdata = {
+
+ /*
+ * Broadcast video modes (PAL and NTSC). I'm unfamiliar with
+ * PAL-M and PAL-N, but from what I've read both modes parallel PAL and
+ * NTSC, so it shouldn't be a problem (I hope).
+ */
+
+ {
+ /* 640x480 @ 60Hz interlaced (NTSC) */
+ "ntsc_640x480i", 60, 640, 480, TV_CLK, 38, 33, 0, 18, 146, 26,
+ FB_SYNC_BROADCAST, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
+ },
+
+ {
+ /* 640x240 @ 60Hz (NTSC) */
+ /* XXX: Broken! Don't use... */
+ "ntsc_640x240", 60, 640, 240, TV_CLK, 38, 33, 0, 0, 146, 22,
+ FB_SYNC_BROADCAST, FB_VMODE_YWRAP
+ },
+
+ {
+ /* 640x480 @ 60hz (VGA) */
+ "vga_640x480", 60, 640, 480, 38, 33, 0, 18, 146, 26,
+ 0, FB_VMODE_YWRAP
+ },
+
+};
+
+#define NUM_TOTAL_MODES ARRAY_SIZE(pvr2_modedb)
+
+#define DEFMODE_NTSC 0
+#define DEFMODE_PAL 0
+#define DEFMODE_VGA 2
+
+static int defmode = DEFMODE_NTSC;
+static const char *mode_option __initdata = NULL;
+
+/* Get the fixed part of the display */
+
+static int pvr2fb_get_fix(struct fb_fix_screeninfo *fix, int con,
+ struct fb_info *info)
+{
+ struct pvr2fb_par par;
+
+ if (con == -1)
+ pvr2_get_par(&par);
+ else {
+ int err;
+
+ if ((err = pvr2_decode_var(&fb_display[con].var, &par)))
+ return err;
+ }
+ return pvr2_encode_fix(fix, &par);
+}
+
+/* Get the user-defined part of the display */
+
+static int pvr2fb_get_var(struct fb_var_screeninfo *var, int con,
+ struct fb_info *info)
+{
+ int err = 0;
+
+ if (con == -1) {
+ struct pvr2fb_par par;
+
+ pvr2_get_par(&par);
+ err = pvr2_encode_var(var, &par);
+ } else
+ *var = fb_display[con].var;
+
+ return err;
+}
+
+/* Set the user-defined part of the display */
+
+static int pvr2fb_set_var(struct fb_var_screeninfo *var, int con,
+ struct fb_info *info)
+{
+ int err, activate = var->activate;
+ int oldxres, oldyres, oldvxres, oldvyres, oldbpp;
+ struct pvr2fb_par par;
+
+ struct display *display;
+ if (con >= 0)
+ display = &fb_display[con];
+ else
+ display = &disp; /* used during initialization */
+
+ /*
+ * 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 = display->var.xoffset;
+ var->yoffset = display->var.yoffset;
+ }
+ if ((err = pvr2_decode_var(var, &par)))
+ return err;
+ pvr2_encode_var(var, &par);
+
+ /* Do memory check and bitfield set here?? */
+
+ if ((activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
+ oldxres = display->var.xres;
+ oldyres = display->var.yres;
+ oldvxres = display->var.xres_virtual;
+ oldvyres = display->var.yres_virtual;
+ oldbpp = display->var.bits_per_pixel;
+ display->var = *var;
+ if (oldxres != var->xres || oldyres != var->yres ||
+ oldvxres != var->xres_virtual || oldvyres != var->yres_virtual ||
+ oldbpp != var->bits_per_pixel) {
+ struct fb_fix_screeninfo fix;
+
+ pvr2_encode_fix(&fix, &par);
+ display->screen_base = (char *)fix.smem_start;
+ display->visual = fix.visual;
+ display->type = fix.type;
+ display->type_aux = fix.type_aux;
+ display->ypanstep = fix.ypanstep;
+ display->ywrapstep = fix.ywrapstep;
+ display->line_length = fix.line_length;
+ display->can_soft_blank = 1;
+ display->inverse = pvr2fb_inverse;
+ switch (var->bits_per_pixel) {
+#ifdef FBCON_HAS_CFB16
+ case 16:
+ display->dispsw = &fbcon_cfb16;
+ display->dispsw_data = fbcon_cmap.cfb16;
+ break;
+#endif
+#ifdef FBCON_HAS_CFB24
+ case 24:
+ display->dispsw = &fbcon_cfb24;
+ display->dispsw_data = fbcon_cmap.cfb24;
+ break;
+#endif
+#ifdef FBCON_HAS_CFB32
+ case 32:
+ display->dispsw = &fbcon_cfb32;
+ display->dispsw_data = fbcon_cmap.cfb32;
+ break;
+#endif
+ default:
+ display->dispsw = &fbcon_dummy;
+ break;
+ }
+ if (fb_info.changevar)
+ (*fb_info.changevar)(con);
+ }
+ if (oldbpp != var->bits_per_pixel) {
+ if ((err = fb_alloc_cmap(&display->cmap, 0, 0)))
+ return err;
+ do_install_cmap(con, info);
+ }
+ if (con == currcon)
+ pvr2_set_var(&display->var);
+ }
+
+ return 0;
+}
+
+/*
+ * Pan or wrap the display.
+ * This call looks only at xoffset, yoffset and the FB_VMODE_YRAP flag
+ */
+
+static int pvr2fb_pan_display(struct fb_var_screeninfo *var, int con,
+ struct fb_info *info)
+{
+ if (var->vmode & FB_VMODE_YWRAP) {
+ if (var->yoffset<0 || var->yoffset >=
+ fb_display[con].var.yres_virtual || var->xoffset)
+ return -EINVAL;
+ } else {
+ if (var->xoffset+fb_display[con].var.xres >
+ fb_display[con].var.xres_virtual ||
+ var->yoffset+fb_display[con].var.yres >
+ fb_display[con].var.yres_virtual)
+ return -EINVAL;
+ }
+ if (con == currcon)
+ pvr2_pan_var(var);
+ fb_display[con].var.xoffset = var->xoffset;
+ fb_display[con].var.yoffset = var->yoffset;
+ if (var->vmode & FB_VMODE_YWRAP)
+ fb_display[con].var.vmode |= FB_VMODE_YWRAP;
+ else
+ fb_display[con].var.vmode &= ~FB_VMODE_YWRAP;
+
+ return 0;
+}
+
+/* Get the colormap */
+
+static int pvr2fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
+ struct fb_info *info)
+{
+ if (con == currcon) /* current console? */
+ return fb_get_cmap(cmap, kspc, pvr2_getcolreg, info);
+ else if (fb_display[con].cmap.len) /* non default colormap? */
+ fb_copy_cmap(&fb_display[con].cmap, cmap, kspc ? 0 : 2);
+ else
+ fb_copy_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel),
+ cmap, kspc ? 0 : 2);
+ return 0;
+}
+
+/* Set the colormap */
+
+static int pvr2fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
+ struct fb_info *info)
+{
+ int err;
+
+ if (!fb_display[con].cmap.len) { /* no colormap allocated? */
+ if ((err = fb_alloc_cmap(&fb_display[con].cmap,
+ 1<<fb_display[con].var.bits_per_pixel,
+ 0)))
+ return err;
+ }
+ if (con == currcon) /* current console? */
+ return fb_set_cmap(cmap, kspc, pvr2_setcolreg, info);
+ else
+ fb_copy_cmap(cmap, &fb_display[con].cmap, kspc ? 0 : 1);
+
+ return 0;
+}
+
+static int pvr2fbcon_switch(int con, struct fb_info *info)
+{
+ /* Do we have to save the colormap? */
+ if (fb_display[currcon].cmap.len)
+ fb_get_cmap(&fb_display[currcon].cmap, 1, pvr2_getcolreg, info);
+
+ currcon = con;
+ pvr2_set_var(&fb_display[con].var);
+ /* Install new colormap */
+ do_install_cmap(con, info);
+ return 0;
+}
+
+static int pvr2fbcon_updatevar(int con, struct fb_info *info)
+{
+ pvr2_pan_var(&fb_display[con].var);
+ return 0;
+}
+
+static void pvr2fbcon_blank(int blank, struct fb_info *info)
+{
+ do_blank = blank ? blank : -1;
+}
+
+/* Setup the colormap */
+
+static void do_install_cmap(int con, struct fb_info *info)
+{
+ if (con != currcon)
+ return;
+ if (fb_display[con].cmap.len)
+ fb_set_cmap(&fb_display[con].cmap, 1, pvr2_setcolreg, info);
+ else
+ fb_set_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel),
+ 1, pvr2_setcolreg, info);
+}
+
+static inline u_long get_line_length(int xres_virtual, int bpp)
+{
+ return (u_long)((((xres_virtual*bpp)+31)&~31) >> 3);
+}
+
+static void set_color_bitfields(struct fb_var_screeninfo *var)
+{
+ switch (var->bits_per_pixel) {
+ case 16: /* RGB 565 */
+ var->red.offset = 11; var->red.length = 5;
+ var->green.offset = 5; var->green.length = 6;
+ var->blue.offset = 0; var->blue.length = 5;
+ var->transp.offset = 0; var->transp.length = 0;
+ break;
+ case 24: /* RGB 888 */
+ var->red.offset = 16; var->red.length = 8;
+ var->green.offset = 8; var->green.length = 8;
+ var->blue.offset = 0; var->blue.length = 8;
+ var->transp.offset = 0; var->transp.length = 0;
+ break;
+ case 32: /* ARGB 8888 */
+ var->red.offset = 16; var->red.length = 8;
+ var->green.offset = 8; var->green.length = 8;
+ var->blue.offset = 0; var->blue.length = 8;
+ var->transp.offset = 24; var->transp.length = 8;
+ break;
+ }
+}
+
+static int pvr2_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
+ u_int *transp, struct fb_info *info)
+{
+ if (regno > 255)
+ return 1;
+
+ *red = palette[regno].red;
+ *green = palette[regno].green;
+ *blue = palette[regno].blue;
+ *transp = 0;
+ return 0;
+}
+
+static int pvr2_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int transp, struct fb_info *info)
+{
+ if (regno > 255)
+ return 1;
+
+ palette[regno].red = red;
+ palette[regno].green = green;
+ palette[regno].blue = blue;
+
+ if (regno < 16) {
+ switch (currbpp) {
+#ifdef FBCON_HAS_CFB16
+ case 16: /* RGB 565 */
+ fbcon_cmap.cfb16[regno] = (red & 0xf800) |
+ ((green & 0xf800) >> 6) |
+ ((blue & 0xf800) >> 11);
+ break;
+#endif
+#ifdef FBCON_HAS_CFB24
+ case 24: /* RGB 888 */
+ red >>= 8; green >>= 8; blue >>= 8;
+ fbcon_cmap.cfb24[regno] = (red << 16) | (green << 8) | blue;
+ break;
+#endif
+#ifdef FBCON_HAS_CFB32
+ case 32: /* ARGB 8888 */
+ red >>= 8; green >>= 8; blue >>= 8;
+ fbcon_cmap.cfb32[regno] = (red << 16) | (green << 8) | blue;
+ break;
+#endif
+ default:
+ DPRINTK("Invalid bit depth %d?!?\n", currbpp);
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+
+static int pvr2_encode_fix(struct fb_fix_screeninfo *fix,
+ struct pvr2fb_par *par)
+{
+ memset(fix, 0, sizeof(struct fb_fix_screeninfo));
+ strcpy(fix->id, pvr2fb_name);
+ fix->smem_start = videomemory;
+ fix->smem_len = videomemorysize;
+ fix->type = FB_TYPE_PACKED_PIXELS;
+ fix->type_aux = 0;
+ fix->visual = FB_VISUAL_TRUECOLOR;
+
+ if (par->vmode & FB_VMODE_YWRAP) {
+ fix->ywrapstep = 1;
+ fix->xpanstep = fix->ypanstep = 0;
+ } else {
+ fix->ywrapstep = 0;
+ fix->xpanstep = 1;
+ fix->ypanstep = 1;
+ }
+ fix->line_length = par->next_line;
+
+ return 0;
+}
+
+/*
+ * Create a hardware video mode using the framebuffer values. If a value needs
+ * to be clipped or constrained it's done here. This routine needs a bit more
+ * work to make sure we're doing the right tests at the right time.
+ */
+static int pvr2_decode_var(struct fb_var_screeninfo *var,
+ struct pvr2fb_par *par)
+{
+ u_long line_length;
+ u_short vtotal;
+
+ if (var->pixclock != TV_CLK && var->pixclock != VGA_CLK) {
+ DPRINTK("Invalid pixclock value %d\n", var->pixclock);
+ return -EINVAL;
+ }
+ par->pixclock = var->pixclock;
+
+ if ((par->xres = var->xres) < 320)
+ par->xres = 320;
+ if ((par->yres = var->yres) < 240)
+ par->yres = 240;
+ if ((par->vxres = var->xres_virtual) < par->xres)
+ par->vxres = par->xres;
+ if ((par->vyres = var->yres_virtual) < par->yres)
+ par->vyres = par->yres;
+
+ if ((par->bpp = var->bits_per_pixel) <= 16)
+ par->bpp = 16;
+ else if ((par->bpp = var->bits_per_pixel) <= 24)
+ par->bpp = 24;
+ else if ((par->bpp = var->bits_per_pixel) <= 32)
+ par->bpp = 32;
+
+ currbpp = par->bpp;
+
+ /*
+ * XXX: It's possible that a user could use a VGA box, change the cable
+ * type in hardware (i.e. switch from VGA<->composite), then change modes
+ * (i.e. switching to another VT). If that happens we should automagically
+ * change the output format to cope, but currently I don't have a VGA box
+ * to make sure this works properly.
+ */
+ cable_type = pvr2_init_cable();
+ if (cable_type == CT_VGA && video_output != VO_VGA)
+ video_output = VO_VGA;
+
+ par->vmode = var->vmode & FB_VMODE_MASK;
+ if (par->vmode & FB_VMODE_INTERLACED && video_output != VO_VGA)
+ par->is_interlaced = 1;
+ /*
+ * XXX: Need to be more creative with this (i.e. allow doublecan for
+ * PAL/NTSC output).
+ */
+ par->is_doublescan = (par->yres < 480 && video_output == VO_VGA);
+
+ par->hsync_total = var->left_margin + var->xres + var->right_margin +
+ var->hsync_len;
+ par->vsync_total = var->upper_margin + var->yres + var->lower_margin +
+ var->vsync_len;
+
+ if (var->sync & FB_SYNC_BROADCAST) {
+ vtotal = par->vsync_total;
+ if (par->is_interlaced)
+ vtotal /= 2;
+ if (vtotal > (PAL_VTOTAL + NTSC_VTOTAL)/2) {
+ /* PAL video output */
+ /* XXX: Should be using a range here ... ? */
+ if (par->hsync_total != PAL_HTOTAL) {
+ DPRINTK("invalid hsync total for PAL\n");
+ return -EINVAL;
+ }
+ /* XXX: Check for start values here... */
+ /* XXX: Check hardware for PAL-compatibility */
+ par->borderstart_h = 116;
+ par->borderstart_v = 44;
+ } else {
+ /* NTSC video output */
+ if (par->hsync_total != NTSC_HTOTAL) {
+ DPRINTK("invalid hsync total for NTSC\n");
+ return -EINVAL;
+ }
+ par->borderstart_h = 126;
+ par->borderstart_v = 18;
+ }
+ } else {
+ /* VGA mode */
+ /* XXX: What else needs to be checked? */
+ /*
+ * XXX: We have a little freedom in VGA modes, what ranges should
+ * be here (i.e. hsync/vsync totals, etc.)?
+ */
+ par->borderstart_h = 126;
+ par->borderstart_v = 40;
+ }
+
+ /* Calculate the remainding offsets */
+ par->borderstop_h = par->borderstart_h + par->hsync_total -
+ var->hsync_len;
+ par->borderstop_v = par->borderstart_v + par->vsync_total -
+ var->vsync_len;
+ par->diwstart_h = par->borderstart_h + var->left_margin;
+ par->diwstart_v = par->borderstart_v + var->upper_margin;
+ if (!par->is_interlaced)
+ par->borderstop_v /= 2;
+
+ if (par->xres < 640)
+ par->is_lowres = 1;
+
+ /* XXX: Needs testing. */
+ if (!((par->vmode ^ var->vmode) & FB_VMODE_YWRAP)) {
+ par->xoffset = var->xoffset;
+ par->yoffset = var->yoffset;
+ if (par->vmode & FB_VMODE_YWRAP) {
+ if (par->xoffset || par->yoffset < 0 || par->yoffset >=
+ par->vyres)
+ par->xoffset = par->yoffset = 0;
+ } else {
+ if (par->xoffset < 0 || par->xoffset > par->vxres-par->xres ||
+ par->yoffset < 0 || par->yoffset > par->vyres-par->yres)
+ par->xoffset = par->yoffset = 0;
+ }
+ } else
+ par->xoffset = par->yoffset = 0;
+
+ /* Check memory sizes */
+ line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
+ if (line_length * var->yres_virtual > videomemorysize)
+ return -ENOMEM;
+ par->disp_start = videomemory + (get_line_length(par->vxres, par->bpp) *
+ par->yoffset) * get_line_length(par->xoffset, par->bpp);
+ par->next_line = line_length;
+
+ return 0;
+}
+
+static int pvr2_encode_var(struct fb_var_screeninfo *var,
+ struct pvr2fb_par *par)
+{
+ memset(var, 0, sizeof(struct fb_var_screeninfo));
+
+ var->xres = par->xres;
+ var->yres = par->yres;
+ var->xres_virtual = par->vxres;
+ var->yres_virtual = par->vyres;
+ var->xoffset = par->xoffset;
+ var->yoffset = par->yoffset;
+
+ var->bits_per_pixel = par->bpp;
+ set_color_bitfields(var);
+
+ var->activate = FB_ACTIVATE_NOW;
+ var->height = -1;
+ var->width = -1;
+
+ var->pixclock = par->pixclock;
+
+ if (par->is_doublescan)
+ var->vmode = FB_VMODE_DOUBLE;
+
+ if (par->is_interlaced)
+ var->vmode |= FB_VMODE_INTERLACED;
+ else
+ var->vmode |= FB_VMODE_NONINTERLACED;
+
+ var->right_margin = par->borderstop_h - (par->diwstart_h + par->xres);
+ var->left_margin = par->diwstart_h - par->borderstart_h;
+ var->hsync_len = par->borderstart_h + (par->hsync_total - par->borderstop_h);
+ var->upper_margin = par->diwstart_v - par->borderstart_v;
+ var->lower_margin = par->borderstop_v - (par->diwstart_v + par->yres);
+ var->vsync_len = par->borderstart_v + (par->vsync_total - par->borderstop_v);
+ if (video_output != VO_VGA)
+ var->sync = FB_SYNC_BROADCAST;
+
+ if (par->vmode & FB_VMODE_YWRAP)
+ var->vmode |= FB_VMODE_YWRAP;
+
+ return 0;
+}
+
+static void pvr2_get_par(struct pvr2fb_par *par)
+{
+ *par = currentpar;
+}
+
+/* Setup the new videomode in hardware */
+
+static void pvr2_set_var(struct fb_var_screeninfo *var)
+{
+ do_vmode_pan = 0;
+ do_vmode_full = 0;
+ pvr2_decode_var(var, ¤tpar);
+
+ do_vmode_full = 1;
+}
+
+/*
+ * Pan or wrap the display
+ * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag in `var'.
+ */
+static void pvr2_pan_var(struct fb_var_screeninfo *var)
+{
+ struct pvr2fb_par *par = ¤tpar;
+
+ par->xoffset = var->xoffset;
+ par->yoffset = var->yoffset;
+ if (var->vmode & FB_VMODE_YWRAP)
+ par->vmode |= FB_VMODE_YWRAP;
+ else
+ par->vmode &= ~FB_VMODE_YWRAP;
+
+ do_vmode_pan = 0;
+ pvr2_update_par();
+ do_vmode_pan = 1;
+}
+
+static int pvr2_update_par(void)
+{
+ struct pvr2fb_par *par = ¤tpar;
+ u_long move;
+
+ move = get_line_length(par->xoffset, par->bpp);
+ if (par->yoffset) {
+ par->disp_start += (par->next_line * par->yoffset) + move;
+ } else
+ par->disp_start += move;
+
+ return 0;
+}
+
+static void pvr2_update_display(void)
+{
+ struct pvr2fb_par *par = ¤tpar;
+
+ /* Update the start address of the display image */
+ ctrl_outl(par->disp_start, DISP_DIWADDRL);
+ ctrl_outl(par->disp_start +
+ get_line_length(par->xoffset + par->xres, par->bpp),
+ DISP_DIWADDRS);
+}
+
+/*
+ * Initialize the video mode. Currently, the 16bpp and 24bpp modes aren't
+ * very stable. It's probably due to the fact that a lot of the 2D video
+ * registers are still undocumented.
+ */
+
+static void pvr2_init_display(void)
+{
+ struct pvr2fb_par *par = ¤tpar;
+ u_short diw_height, diw_width, diw_modulo = 1;
+ u_short bytesperpixel = par->bpp / 8;
+
+ /* hsync and vsync totals */
+ ctrl_outl((par->vsync_total << 16) | par->hsync_total, DISP_SYNCSIZE);
+
+ /* column height, modulo, row width */
+ /* since we're "panning" within vram, we need to offset things based
+ * on the offset from the virtual x start to our real gfx. */
+ if (video_output != VO_VGA && par->is_interlaced)
+ diw_modulo += par->next_line / 4;
+ diw_height = (par->is_interlaced ? par->yres / 2 : par->yres);
+ diw_width = get_line_length(par->xres, par->bpp) / 4;
+ ctrl_outl((diw_modulo << 20) | (--diw_height << 10) | --diw_width,
+ DISP_DIWSIZE);
+
+ /* display address, long and short fields */
+ ctrl_outl(par->disp_start, DISP_DIWADDRL);
+ ctrl_outl(par->disp_start +
+ get_line_length(par->xoffset + par->xres, par->bpp),
+ DISP_DIWADDRS);
+
+ /* border horizontal, border vertical, border color */
+ ctrl_outl((par->borderstart_h << 16) | par->borderstop_h, DISP_BRDRHORZ);
+ ctrl_outl((par->borderstart_v << 16) | par->borderstop_v, DISP_BRDRVERT);
+ ctrl_outl(0, DISP_BRDRCOLR);
+
+ /* display window start position */
+ ctrl_outl(par->diwstart_h, DISP_DIWHSTRT);
+ ctrl_outl((par->diwstart_v << 16) | par->diwstart_v, DISP_DIWVSTRT);
+
+ /* misc. settings */
+ ctrl_outl((0x16 << 16) | par->is_lowres, DISP_DIWCONF);
+
+ /* clock doubler (for VGA), scan doubler, display enable */
+ ctrl_outl(((video_output == VO_VGA) << 23) |
+ (par->is_doublescan << 1) | 1, DISP_DIWMODE);
+
+ /* bits per pixel */
+ ctrl_outl(ctrl_inl(DISP_DIWMODE) | (--bytesperpixel << 2), DISP_DIWMODE);
+
+ /* video enable, color sync, interlace,
+ * hsync and vsync polarity (currently unused) */
+ ctrl_outl(0x100 | ((par->is_interlaced /*|4*/) << 4), DISP_SYNCCONF);
+
+}
+
+/* Simulate blanking by making the border cover the entire screen */
+
+#define BLANK_BIT (1<<3)
+
+static void pvr2_do_blank(void)
+{
+ u_long diwconf;
+
+ diwconf = ctrl_inl(DISP_DIWCONF);
+ if (do_blank > 0)
+ ctrl_outl(diwconf | BLANK_BIT, DISP_DIWCONF);
+ else
+ ctrl_outl(diwconf & ~BLANK_BIT, DISP_DIWCONF);
+
+ is_blanked = do_blank > 0 ? do_blank : 0;
+}
+
+static void pvr2fb_interrupt(int irq, void *dev_id, struct pt_regs *fp)
+{
+ if (do_vmode_pan || do_vmode_full)
+ pvr2_update_display();
+
+ if (do_vmode_full)
+ pvr2_init_display();
+
+ if (do_vmode_pan)
+ do_vmode_pan = 0;
+
+ if (do_blank) {
+ pvr2_do_blank();
+ do_blank = 0;
+ }
+
+ if (do_vmode_full) {
+ do_vmode_full = 0;
+ }
+}
+
+/*
+ * Determine the cable type and initialize the cable output format. Don't do
+ * anything if the cable type has been overidden (via "cable:XX").
+ */
+
+#define PCTRA 0xff80002c
+#define PDTRA 0xff800030
+#define VOUTC 0xa0702c00
+
+static int pvr2_init_cable(void)
+{
+ if (cable_type < 0) {
+ ctrl_outl((ctrl_inl(PCTRA) & 0xfff0ffff) | 0x000a0000,
+ PCTRA);
+ cable_type = (ctrl_inw(PDTRA) >> 8) & 3;
+ }
+
+ /* Now select the output format (either composite or other) */
+ /* XXX: Save the previous val first, as this reg is also AICA
+ related */
+ if (cable_type == CT_COMPOSITE)
+ ctrl_outl(3 << 8, VOUTC);
+ else
+ ctrl_outl(0, VOUTC);
+
+ return cable_type;
+}
+
+int __init pvr2fb_init(void)
+{
+ struct fb_var_screeninfo var;
+ u_long modememused;
+
+ if (!MACH_DREAMCAST)
+ return -ENXIO;
+
+ /* Make a guess at the monitor based on the attached cable */
+ if (pvr2_init_cable() == CT_VGA) {
+ fb_info.monspecs.hfmin = 30000;
+ fb_info.monspecs.hfmax = 70000;
+ fb_info.monspecs.vfmin = 60;
+ fb_info.monspecs.vfmax = 60;
+ }
+ else { /* Not VGA, using a TV (taken from acornfb) */
+ fb_info.monspecs.hfmin = 15469;
+ fb_info.monspecs.hfmax = 15781;
+ fb_info.monspecs.vfmin = 49;
+ fb_info.monspecs.vfmax = 51;
+ }
+
+ /* XXX: This needs to pull default video output via BIOS or other means */
+ if (video_output < 0) {
+ if (cable_type == CT_VGA)
+ video_output = VO_VGA;
+ else
+ video_output = VO_NTSC;
+ }
+
+ strcpy(fb_info.modename, pvr2fb_name);
+ fb_info.changevar = NULL;
+ fb_info.node = -1;
+ fb_info.fbops = &pvr2fb_ops;
+ fb_info.disp = &disp;
+ fb_info.switch_con = &pvr2fbcon_switch;
+ fb_info.updatevar = &pvr2fbcon_updatevar;
+ fb_info.blank = &pvr2fbcon_blank;
+ fb_info.flags = FBINFO_FLAG_DEFAULT;
+ memset(&var, 0, sizeof(var));
+
+ if (video_output == VO_VGA)
+ defmode = DEFMODE_VGA;
+
+ if (!fb_find_mode(&var, &fb_info, mode_option, pvr2_modedb,
+ NUM_TOTAL_MODES, &pvr2_modedb[defmode], 16)) {
+ return -EINVAL;
+ }
+
+ if (request_irq(HW_EVENT_VSYNC, pvr2fb_interrupt, 0,
+ "pvr2 VBL handler", ¤tpar)) {
+ DPRINTK("couldn't register VBL int\n");
+ return -EBUSY;
+ }
+
+#ifdef CONFIG_MTRR
+ if (enable_mtrr) {
+ mtrr_handle = mtrr_add(videomemory, videomemorysize, MTRR_TYPE_WRCOMB, 1);
+ printk("pvr2fb: MTRR turned on\n");
+ }
+#endif
+
+ pvr2fb_set_var(&var, -1, &fb_info);
+
+ if (register_framebuffer(&fb_info) < 0)
+ return -EINVAL;
+
+ modememused = get_line_length(var.xres_virtual, var.bits_per_pixel);
+ modememused *= var.yres_virtual;
+ printk("fb%d: %s frame buffer device, using %ldk/%ldk of video memory\n",
+ GET_FB_IDX(fb_info.node), fb_info.modename, modememused>>10,
+ videomemorysize>>10);
+ printk("fb%d: Mode %dx%d-%d pitch = %ld cable: %s video output: %s\n",
+ GET_FB_IDX(fb_info.node), var.xres, var.yres, var.bits_per_pixel,
+ get_line_length(var.xres, var.bits_per_pixel),
+ (char *)pvr2_get_param(cables, NULL, cable_type, 6),
+ (char *)pvr2_get_param(outputs, NULL, video_output, 6));
+
+ return 0;
+}
+
+static void __exit pvr2fb_exit(void)
+{
+#ifdef CONFIG_MTRR
+ if (enable_mtrr) {
+ mtrr_del(mtrr_handle, videomemory, videomemorysize);
+ printk("pvr2fb: MTRR turned off\n");
+ }
+#endif
+ unregister_framebuffer(&fb_info);
+}
+
+static int __init pvr2_get_param(const struct pvr2_params *p, const char *s,
+ int val, int size)
+{
+ int i;
+
+ for (i = 0 ; i < size ; i++ ) {
+ if (s != NULL) {
+ if (!strnicmp(p[i].name, s, strlen(s)))
+ return p[i].val;
+ } else {
+ if (p[i].val == val)
+ return (int)p[i].name;
+ }
+ }
+ return -1;
+}
+
+/*
+ * Parse command arguments. Supported arguments are:
+ * inverse Use inverse color maps
+ * nomtrr Disable MTRR usage
+ * font:<fontname> Specify console font
+ * cable:composite|rgb|vga Override the video cable type
+ * output:NTSC|PAL|VGA Override the video output format
+ *
+ * <xres>x<yres>[-<bpp>][@<refresh>] or,
+ * <name>[-<bpp>][@<refresh>] Startup using this video mode
+ */
+
+#ifndef MODULE
+int __init pvr2fb_setup(char *options)
+{
+ char *this_opt;
+ char cable_arg[80];
+ char output_arg[80];
+
+ fb_info.fontname[0] = '\0';
+
+ if (!options || !*options)
+ return 0;
+
+ while ((this_opt = strsep(&options, ","))) {
+ if (!*this_opt)
+ continue;
+ if (!strcmp(this_opt, "inverse")) {
+ pvr2fb_inverse = 1;
+ fb_invert_cmaps();
+ } else if (!strncmp(this_opt, "font:", 5))
+ strcpy(fb_info.fontname, this_opt + 5);
+ else if (!strncmp(this_opt, "cable:", 6))
+ strcpy(cable_arg, this_opt + 6);
+ else if (!strncmp(this_opt, "output:", 7))
+ strcpy(output_arg, this_opt + 7);
+#ifdef CONFIG_MTRR
+ else if (!strncmp(this_opt, "nomtrr", 6))
+ enable_mtrr = 0;
+#endif
+ else
+ mode_option = this_opt;
+ }
+
+ if (*cable_arg)
+ cable_type = pvr2_get_param(cables, cable_arg, 0, 6);
+
+ if (*output_arg)
+ video_output = pvr2_get_param(outputs, output_arg, 0, 6);
+
+ return 0;
+}
+#endif
+
+#ifdef MODULE
+module_init(pvr2fb_init);
+#endif
+module_exit(pvr2fb_exit);
+
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TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)