framebuffer driver for G364 based graphiccards

1 files changed, 514 insertions, 0 deletions

diff --git a/drivers/video/g364fb.c b/drivers/video/g364fb.c
new file mode 100644
index 000000000..56939ef61
--- /dev/null
+++ b/drivers/video/g364fb.c
@@ -0,0 +1,514 @@
+/*
+ * linux/drivers/video/g364fb.c -- Mips Magnum frame buffer device
+ *
+ * (C) 1998 Thomas Bogendoerfer
+ *
+ *  This driver is based on tgafb.c
+ *
+ *	Copyright (C) 1997 Geert Uytterhoeven 
+ *	Copyright (C) 1995  Jay Estabrook
+ *
+ *  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/config.h>
+#include <linux/module.h>
+#include <linux/sched.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/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/selection.h>
+#include <linux/console.h>
+#include <asm/io.h>
+#include <asm/jazz.h>
+
+#include "fbcon.h"
+#include "fbcon-cfb8.h"
+
+/* 
+ * Various defines for the G364
+ */
+#define G364_MEM_BASE   0xe4400000
+#define G364_PORT_BASE  0xe4000000
+#define ID_REG 		0xe4000000  	/* Read only */
+#define BOOT_REG 	0xe4080000
+#define TIMING_REG 	0xe4080108 	/* to 0x080170 - DON'T TOUCH! */
+#define DISPLAY_REG 	0xe4080118
+#define VDISPLAY_REG 	0xe4080150
+#define MASK_REG 	0xe4080200
+#define CTLA_REG 	0xe4080300
+#define CURS_TOGGLE 	0x800000
+#define BIT_PER_PIX	0x700000	/* bits 22 to 20 of Control A */
+#define DELAY_SAMPLE    0x080000
+#define PORT_INTER	0x040000
+#define PIX_PIPE_DEL	0x030000	/* bits 17 and 16 of Control A */
+#define PIX_PIPE_DEL2	0x008000	/* same as above - don't ask me why */
+#define TR_CYCLE_TOG	0x004000
+#define VRAM_ADR_INC	0x003000	/* bits 13 and 12 of Control A */
+#define BLANK_OFF	0x000800
+#define FORCE_BLANK	0x000400
+#define BLK_FUN_SWTCH	0x000200
+#define BLANK_IO	0x000100
+#define BLANK_LEVEL	0x000080
+#define A_VID_FORM	0x000040
+#define D_SYNC_FORM	0x000020
+#define FRAME_FLY_PAT	0x000010
+#define OP_MODE		0x000008
+#define INTL_STAND	0x000004
+#define SCRN_FORM	0x000002
+#define ENABLE_VTG	0x000001	
+#define TOP_REG 	0xe4080400
+#define CURS_PAL_REG 	0xe4080508 	/* to 0x080518 */
+#define CHKSUM_REG 	0xe4080600 	/* to 0x080610 - unused */
+#define CURS_POS_REG 	0xe4080638
+#define CLR_PAL_REG 	0xe4080800	/* to 0x080ff8 */
+#define CURS_PAT_REG 	0xe4081000	/* to 0x081ff8 */
+#define MON_ID_REG 	0xe4100000 	/* unused */
+#define RESET_REG 	0xe4180000  	/* Write only */
+
+#define arraysize(x)	(sizeof(x)/sizeof(*(x)))
+
+static int currcon = 0;
+static struct display disp;
+static struct fb_info fb_info;
+static struct { u_char red, green, blue, pad; } palette[256];
+
+static struct fb_fix_screeninfo fb_fix = { { "G364 8plane", } };
+static struct fb_var_screeninfo fb_var = { 0, };
+
+
+/*
+ *  Interface used by the world
+ */
+static int g364fb_open(struct fb_info *info);
+static int g364fb_release(struct fb_info *info);
+static int g364fb_get_fix(struct fb_fix_screeninfo *fix, int con,
+			  struct fb_info *info);
+static int g364fb_get_var(struct fb_var_screeninfo *var, int con,
+			  struct fb_info *info);
+static int g364fb_set_var(struct fb_var_screeninfo *var, int con,
+			  struct fb_info *info);
+static int g364fb_pan_display(struct fb_var_screeninfo *var, int con,
+			      struct fb_info *info);
+static int g364fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
+			   struct fb_info *info);
+static int g364fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
+			   struct fb_info *info);
+static int g364fb_ioctl(struct inode *inode, struct file *file, u_int cmd,
+			u_long arg, int con, struct fb_info *info);
+
+
+/*
+ *  Interface to the low level console driver
+ */
+void g364fb_init(void);
+static int g364fbcon_switch(int con, struct fb_info *info);
+static int g364fbcon_updatevar(int con, struct fb_info *info);
+static void g364fbcon_blank(int blank, struct fb_info *info);
+
+
+/*
+ *  Internal routines
+ */
+static int g364fb_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
+			    u_int *transp, struct fb_info *info);
+static int g364fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+			    u_int transp, struct fb_info *info);
+static void do_install_cmap(int con, struct fb_info *info);
+
+
+static struct fb_ops g364fb_ops = {
+    g364fb_open, g364fb_release, g364fb_get_fix, g364fb_get_var, g364fb_set_var,
+    g364fb_get_cmap, g364fb_set_cmap, g364fb_pan_display, g364fb_ioctl
+};
+
+
+void fbcon_g364fb_cursor(struct display *p, int mode, int x, int y)
+{
+    switch (mode) {
+     case CM_ERASE:
+	*(unsigned int *) CTLA_REG |= CURS_TOGGLE;
+	break;
+
+     case CM_MOVE:
+     case CM_DRAW:
+	*(unsigned int *) CTLA_REG &= ~CURS_TOGGLE;
+	*(unsigned int *) CURS_POS_REG = ((x * p->fontwidth) << 12) | ((y * p->fontheight)-p->var.yoffset);
+	break;
+    }
+}
+
+
+static struct display_switch fbcon_g364cfb8 = {
+    fbcon_cfb8_setup, fbcon_cfb8_bmove, fbcon_cfb8_clear, fbcon_cfb8_putc,
+    fbcon_cfb8_putcs, fbcon_cfb8_revc, fbcon_g364fb_cursor
+};
+
+
+/*
+ *  Open/Release the frame buffer device
+ */
+static int g364fb_open(struct fb_info *info)                                       
+{
+    /*                                                                     
+     *  Nothing, only a usage count for the moment                          
+     */                                                                    
+    MOD_INC_USE_COUNT;
+    return(0);                              
+}
+        
+static int g364fb_release(struct fb_info *info)
+{
+    MOD_DEC_USE_COUNT;
+    return(0);                                                    
+}
+
+
+/*
+ *  Get the Fixed Part of the Display
+ */
+static int g364fb_get_fix(struct fb_fix_screeninfo *fix, int con,
+			  struct fb_info *info)
+{
+    memcpy(fix, &fb_fix, sizeof(fb_fix));
+    return 0;
+}
+
+
+/*
+ *  Get the User Defined Part of the Display
+ */
+static int g364fb_get_var(struct fb_var_screeninfo *var, int con,
+			  struct fb_info *info)
+{
+    memcpy(var, &fb_var, sizeof(fb_var));
+    return 0;
+}
+
+
+/*
+ *  Set the User Defined Part of the Display
+ */
+static int g364fb_set_var(struct fb_var_screeninfo *var, int con,
+			  struct fb_info *info)
+{
+    struct display *display;
+    int oldbpp = -1, err;
+
+    if (con >= 0)
+	display = &fb_display[con];
+    else
+	display = &disp;	/* used during initialization */
+
+    if (var->xres > fb_var.xres || var->yres > fb_var.yres ||
+	var->xres_virtual > fb_var.xres_virtual ||
+	var->yres_virtual > fb_var.yres_virtual ||
+	var->bits_per_pixel > fb_var.bits_per_pixel ||
+	var->nonstd ||
+	(var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
+	return -EINVAL;
+    memcpy(var, &fb_var, sizeof(fb_var));
+    
+    if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
+	oldbpp = display->var.bits_per_pixel;
+	display->var = *var;
+	*(unsigned int *)TOP_REG = var->yoffset * var->xres;	
+    }
+    if (oldbpp != var->bits_per_pixel) {
+	if ((err = fb_alloc_cmap(&display->cmap, 0, 0)))
+	    return err;
+	do_install_cmap(con, info);
+    }
+    return 0;
+}
+
+
+/*
+ *  Pan or Wrap the Display
+ *
+ *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
+ */
+static int g364fb_pan_display(struct fb_var_screeninfo *var, int con,
+			      struct fb_info *info)
+{
+    if (var->xoffset || var->yoffset+var->yres > var->yres_virtual)
+	return -EINVAL;
+    
+    *(unsigned int *)TOP_REG = var->yoffset * var->xres;
+    return 0;
+}
+
+/*
+ *  Get the Colormap
+ */
+static int g364fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
+			   struct fb_info *info)
+{
+    if (con == currcon) /* current console? */
+	return fb_get_cmap(cmap, &fb_display[con].var, kspc, g364fb_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 g364fb_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? */
+	err = fb_set_cmap(cmap, &fb_display[con].var, kspc, g364fb_setcolreg,
+			  info);
+	return err;
+    } else
+	fb_copy_cmap(cmap, &fb_display[con].cmap, kspc ? 0 : 1);
+    return 0;
+}
+
+
+static int g364fb_ioctl(struct inode *inode, struct file *file, u_int cmd,
+			u_long arg, int con, struct fb_info *info)
+{
+    return -EINVAL;
+}
+
+
+/*
+ *  Initialisation
+ */
+__initfunc(void g364fb_init(void))
+{
+    int err;
+    int i,j;
+    volatile unsigned int *pal_ptr = (volatile unsigned int *) CLR_PAL_REG;
+    volatile unsigned int *curs_pal_ptr = (volatile unsigned int *) CURS_PAL_REG;
+    unsigned int xres, yres;
+    int mem;
+    
+    /* TBD: G364 detection */
+    
+    /* get the resolution set by ARC console */
+    *(volatile unsigned int *)CTLA_REG &= ~ENABLE_VTG;
+    xres = (*((volatile unsigned int*)DISPLAY_REG) & 0x00ffffff) * 4;
+    yres = (*((volatile unsigned int*)VDISPLAY_REG) & 0x00ffffff) / 2;
+    *(volatile unsigned int *)CTLA_REG |= ENABLE_VTG;    
+
+    /* initialise color palette */
+    for (i = 0; i < 16; i++) {
+	j = color_table[i];
+	palette[i].red=default_red[j];
+	palette[i].green=default_grn[j];
+	palette[i].blue=default_blu[j];
+	pal_ptr[i << 1] = (palette[i].red << 16) | (palette[i].green << 8) | palette[i].blue;
+    }
+    
+    /* setup cursor */
+    curs_pal_ptr[0] |= 0x00ffffff;
+    curs_pal_ptr[2] |= 0x00ffffff;
+    curs_pal_ptr[4] |= 0x00ffffff;
+
+    /*
+     * first set the whole cursor to transparent
+     */
+    for (i = 0; i < 512; i++)
+	*(unsigned short *)(CURS_PAT_REG+i*8) = 0;
+
+    /*
+     * switch the last two lines to cursor palette 3
+     * we assume here, that FONTSIZE_X is 8
+     */
+    *(unsigned short *)(CURS_PAT_REG + 14*64) = 0xffff;
+    *(unsigned short *)(CURS_PAT_REG + 15*64) = 0xffff;			    
+
+    fb_var.bits_per_pixel = 8;
+    fb_var.xres = fb_var.xres_virtual = xres;
+    fb_var.yres = yres;
+
+    fb_fix.line_length = (xres / 8) * fb_var.bits_per_pixel;
+    fb_fix.smem_start = (char *)0x40000000; /* physical address */
+    /* get size of video memory; this is special for the JAZZ hardware */
+    mem = (r4030_read_reg32(JAZZ_R4030_CONFIG) >> 8) & 3;
+    fb_fix.smem_len = (1 << (mem*2)) * 512 * 1024;
+    fb_fix.type = FB_TYPE_PACKED_PIXELS;
+    fb_fix.type_aux = 0;
+    fb_fix.visual = FB_VISUAL_PSEUDOCOLOR;    
+    fb_fix.xpanstep = 0;
+    fb_fix.ypanstep = 1;
+    fb_fix.ywrapstep = 0;
+    fb_fix.mmio_start = NULL;
+    fb_fix.mmio_len = 0;
+    fb_fix.accel = FB_ACCEL_NONE;
+    
+    fb_var.yres_virtual = fb_fix.smem_len / xres;
+    fb_var.xoffset = fb_var.yoffset = 0;
+    fb_var.grayscale = 0;
+
+    fb_var.red.offset = 0;
+    fb_var.green.offset = 0;
+    fb_var.blue.offset = 0;
+
+    fb_var.red.length = fb_var.green.length = fb_var.blue.length = 8;
+    fb_var.red.msb_right = fb_var.green.msb_right = fb_var.blue.msb_right = 0;
+    fb_var.transp.offset = fb_var.transp.length = fb_var.transp.msb_right = 0;
+    fb_var.nonstd = 0;
+    fb_var.activate = 0;
+    fb_var.height = fb_var.width = -1;
+    fb_var.accel_flags = 0;
+    fb_var.pixclock = 39722;
+    fb_var.left_margin = 40;
+    fb_var.right_margin = 24;
+    fb_var.upper_margin = 32;
+    fb_var.lower_margin = 11;
+    fb_var.hsync_len = 96;
+    fb_var.vsync_len = 2;
+    fb_var.sync = 0;
+    fb_var.vmode = FB_VMODE_NONINTERLACED;
+
+    disp.var = fb_var;
+    disp.cmap.start = 0;
+    disp.cmap.len = 0;
+    disp.cmap.red = disp.cmap.green = disp.cmap.blue = disp.cmap.transp = NULL;
+    disp.screen_base = G364_MEM_BASE; /* virtual kernel address */
+    disp.visual = fb_fix.visual;
+    disp.type = fb_fix.type;
+    disp.type_aux = fb_fix.type_aux;
+    disp.ypanstep = fb_fix.ypanstep;
+    disp.ywrapstep = fb_fix.ywrapstep;
+    disp.line_length = fb_fix.line_length;
+    disp.can_soft_blank = 1;
+    disp.inverse = 0;
+    disp.dispsw = &fbcon_g364cfb8;
+
+    strcpy(fb_info.modename, fb_fix.id);
+    fb_info.node = -1;
+    fb_info.fbops = &g364fb_ops;
+    fb_info.disp = &disp;
+    fb_info.fontname[0] = '\0';
+    fb_info.changevar = NULL;
+    fb_info.switch_con = &g364fbcon_switch;
+    fb_info.updatevar = &g364fbcon_updatevar;
+    fb_info.blank = &g364fbcon_blank;
+
+    err = register_framebuffer(&fb_info);
+    if (err < 0)
+	return;
+
+    g364fb_set_var(&fb_var, -1, &fb_info);
+
+    printk("fb%d: %s frame buffer device\n", GET_FB_IDX(fb_info.node),
+	   fb_fix.id);
+}
+
+
+static int g364fbcon_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, &fb_display[currcon].var, 1,
+		    g364fb_getcolreg, info);
+
+    currcon = con;
+    /* Install new colormap */
+    do_install_cmap(con, info);
+    g364fbcon_updatevar(con, info);    
+    return 0;
+}
+
+/*
+ *  Update the `var' structure (called by fbcon.c)
+ */
+static int g364fbcon_updatevar(int con, struct fb_info *info)
+{
+    if (con == currcon) {
+	struct fb_var_screeninfo *var = &fb_display[currcon].var;
+
+	/* hardware scrolling */
+	*(unsigned int *)TOP_REG = var->yoffset * var->xres;	
+    }
+    return 0;
+}
+
+/*
+ *  Blank the display.
+ */
+static void g364fbcon_blank(int blank, struct fb_info *info)
+{
+    if (blank)
+	*(unsigned int *) CTLA_REG |= FORCE_BLANK;	
+    else
+	*(unsigned int *) CTLA_REG &= ~FORCE_BLANK;	
+}
+
+/*
+ *  Read a single color register and split it into
+ *  colors/transparent. Return != 0 for invalid regno.
+ */
+static int g364fb_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;
+    return 0;
+}
+
+/*
+ *  Set a single color register. The values supplied are already
+ *  rounded down to the hardware's capabilities (according to the
+ *  entries in the var structure). Return != 0 for invalid regno.
+ */
+static int g364fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+			    u_int transp, struct fb_info *info)
+{
+    volatile unsigned int *ptr = (volatile unsigned int *) CLR_PAL_REG;
+
+    if (regno > 255)
+	return 1;
+    palette[regno].red = red;
+    palette[regno].green = green;
+    palette[regno].blue = blue;
+    
+    ptr[regno << 1] = (red << 16) | (green << 8) | blue;
+
+    return 0;
+}
+
+
+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, &fb_display[con].var, 1,
+		    g364fb_setcolreg, info);
+    else
+	fb_set_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel),
+				    &fb_display[con].var, 1, g364fb_setcolreg,
+				    info);
+}