patch-2.4.4 linux/drivers/video/pmag-ba-fb.c

• Lines: 432
• Date: Wed Apr 18 11:49:12 2001
• Orig file: v2.4.3/linux/drivers/video/pmag-ba-fb.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/drivers/video/pmag-ba-fb.c linux/drivers/video/pmag-ba-fb.c
@@ -0,0 +1,431 @@
+/*
+ *      linux/drivers/video/pmag-ba-fb.c
+ *
+ *	PMAG-BA TurboChannel framebuffer card support ... derived from:
+ *	"HP300 Topcat framebuffer support (derived from macfb of all things)
+ *	Phil Blundell <philb@gnu.org> 1998", the original code can be
+ *      found in the file hpfb.c in the same directory.
+ *
+ *	Based on digital document:
+ * 	"PMAG-BA TURBOchannel Color Frame Buffer
+ *	 Functional Specification", Revision 1.2, August 27, 1990
+ *
+ *      DECstation related code Copyright (C) 1999, 2000, 2001 by
+ *      Michael Engel <engel@unix-ag.org>, 
+ *      Karsten Merker <merker@linuxtag.org> and
+ *	Harald Koerfgen <harald@unix-ag.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.
+ *
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/malloc.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/fb.h>
+#include <asm/bootinfo.h>
+#include <asm/dec/machtype.h>
+#include <asm/dec/tc.h>
+#include "pmag-ba-fb.h"
+
+#include <video/fbcon.h>
+#include <video/fbcon-mfb.h>
+#include <video/fbcon-cfb2.h>
+#include <video/fbcon-cfb4.h>
+#include <video/fbcon-cfb8.h>
+
+#define arraysize(x)    (sizeof(x)/sizeof(*(x)))
+
+struct pmag_ba_ramdac_regs {
+	unsigned char addr_low;
+	unsigned char pad0[3];
+	unsigned char addr_hi;
+	unsigned char pad1[3];
+	unsigned char data;
+	unsigned char pad2[3];
+	unsigned char cmap;
+};
+
+struct pmag_ba_my_fb_info {
+	struct fb_info info;
+	struct pmag_ba_ramdac_regs *bt459_regs;
+	unsigned long pmagba_fb_start;
+	unsigned long pmagba_fb_size;
+	unsigned long pmagba_fb_line_length;
+};
+
+static struct display disp;
+/*
+ * Max 3 TURBOchannel slots -> max 3 PMAG-BA :)
+ */
+static struct pmag_ba_my_fb_info pmagba_fb_info[3];
+
+static struct fb_var_screeninfo pmagbafb_defined = {
+	0, 0, 0, 0,		/* W,H, W, H (virtual) load xres,xres_virtual */
+	0, 0,			/* virtual -> visible no offset */
+	0,			/* depth -> load bits_per_pixel */
+	0,			/* greyscale ? */
+	{0, 0, 0},		/* R */
+	{0, 0, 0},		/* G */
+	{0, 0, 0},		/* B */
+	{0, 0, 0},		/* transparency */
+	0,			/* standard pixel format */
+	FB_ACTIVATE_NOW,
+	274, 195,		/* 14" monitor */
+	FB_ACCEL_NONE,
+	0L, 0L, 0L, 0L, 0L,
+	0L, 0L, 0,		/* No sync info */
+	FB_VMODE_NONINTERLACED,
+	{0, 0, 0, 0, 0, 0}
+};
+
+struct pmagbafb_par {
+};
+
+static int currcon = 0;
+struct pmagbafb_par current_par;
+
+static void pmagbafb_encode_var(struct fb_var_screeninfo *var,
+				struct pmagbafb_par *par)
+{
+	int i = 0;
+	var->xres = 1024;
+	var->yres = 864;
+	var->xres_virtual = 1024;
+	var->yres_virtual = 864;
+	var->xoffset = 0;
+	var->yoffset = 0;
+	var->bits_per_pixel = 8;
+	var->grayscale = 0;
+	var->transp.offset = 0;
+	var->transp.length = 0;
+	var->transp.msb_right = 0;
+	var->nonstd = 0;
+	var->activate = 1;
+	var->height = -1;
+	var->width = -1;
+	var->vmode = FB_VMODE_NONINTERLACED;
+	var->pixclock = 0;
+	var->sync = 0;
+	var->left_margin = 0;
+	var->right_margin = 0;
+	var->upper_margin = 0;
+	var->lower_margin = 0;
+	var->hsync_len = 0;
+	var->vsync_len = 0;
+	for (i = 0; i < arraysize(var->reserved); i++)
+		var->reserved[i] = 0;
+}
+
+static void pmagbafb_get_par(struct pmagbafb_par *par)
+{
+	*par = current_par;
+}
+
+static int pmagba_fb_update_var(int con, struct fb_info *info)
+{
+	return 0;
+}
+
+static int pmagba_do_fb_set_var(struct fb_var_screeninfo *var,
+				int isactive)
+{
+	struct pmagbafb_par par;
+
+	pmagbafb_get_par(&par);
+	pmagbafb_encode_var(var, &par);
+	return 0;
+}
+
+/*
+ * Turn hardware cursor off
+ */
+void pmagbafb_erase_cursor(struct pmag_ba_my_fb_info *info)
+{
+	info->bt459_regs->addr_low = 0;
+	info->bt459_regs->addr_hi = 3;
+	info->bt459_regs->data = 0;
+}
+
+/*
+ * Write to a Bt459 color map register
+ */
+void pmag_ba_bt459_write_colormap(struct pmag_ba_my_fb_info *info,
+				  int reg, __u8 red, __u8 green, __u8 blue)
+{
+	info->bt459_regs->addr_low = (__u8) reg;
+	info->bt459_regs->addr_hi = 0;
+	info->bt459_regs->cmap = red;
+	info->bt459_regs->cmap = green;
+	info->bt459_regs->cmap = blue;
+}
+
+/*
+ * Get the palette
+ */
+
+static int pmagbafb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
+			     struct fb_info *info)
+{
+	unsigned int i;
+	unsigned int length;
+
+	if (((cmap->start) + (cmap->len)) >= 256) {
+		length = 256 - (cmap->start);
+	} else {
+		length = cmap->len;
+	}
+	for (i = 0; i < length; i++) {
+		/*
+		 * TODO
+		 */
+	}
+	return 0;
+}
+
+/*
+ * Set the palette. 
+ */
+static int pmagbafb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
+			     struct fb_info *info)
+{
+	unsigned int i;
+	__u8 cmap_red, cmap_green, cmap_blue;
+	unsigned int length;
+
+	if (((cmap->start) + (cmap->len)) >= 256)
+		length = 256 - (cmap->start);
+	else
+		length = cmap->len;
+
+	for (i = 0; i < length; i++) {
+		cmap_red = ((cmap->red[i]) >> 8);	/* The cmap fields are 16 bits    */
+		cmap_green = ((cmap->green[i]) >> 8);	/* wide, but the harware colormap */
+		cmap_blue = ((cmap->blue[i]) >> 8);	/* registers are only 8 bits wide */
+
+		pmag_ba_bt459_write_colormap((struct pmag_ba_my_fb_info *)
+					     info, cmap->start + i,
+					     cmap_red, cmap_green,
+					     cmap_blue);
+	}
+	return 0;
+}
+
+static int pmagbafb_get_var(struct fb_var_screeninfo *var, int con,
+			    struct fb_info *info)
+{
+	struct pmagbafb_par par;
+	if (con == -1) {
+		pmagbafb_get_par(&par);
+		pmagbafb_encode_var(var, &par);
+	} else
+		*var = fb_display[con].var;
+	return 0;
+}
+
+
+static int pmagbafb_set_var(struct fb_var_screeninfo *var, int con,
+			    struct fb_info *info)
+{
+	int err;
+
+	if ((err = pmagba_do_fb_set_var(var, 1)))
+		return err;
+	return 0;
+}
+
+static void pmagbafb_encode_fix(struct fb_fix_screeninfo *fix,
+				struct pmagbafb_par *par,
+				struct pmag_ba_my_fb_info *info)
+{
+	memset(fix, 0, sizeof(struct fb_fix_screeninfo));
+	strcpy(fix->id, "PMAG-BA");
+
+	fix->smem_start = info->pmagba_fb_start;
+	fix->smem_len = info->pmagba_fb_size;
+	fix->type = FB_TYPE_PACKED_PIXELS;
+	fix->visual = FB_VISUAL_PSEUDOCOLOR;
+	fix->xpanstep = 0;
+	fix->ypanstep = 0;
+	fix->ywrapstep = 0;
+	fix->line_length = info->pmagba_fb_line_length;
+}
+
+static int pmagbafb_get_fix(struct fb_fix_screeninfo *fix, int con,
+			    struct fb_info *info)
+{
+	struct pmagbafb_par par;
+
+	pmagbafb_get_par(&par);
+	pmagbafb_encode_fix(fix, &par, (struct pmag_ba_my_fb_info *) info);
+
+	return 0;
+}
+
+
+static int pmagbafb_ioctl(struct inode *inode, struct file *file,
+			  unsigned int cmd, unsigned long arg, int con,
+			  struct fb_info *info)
+{
+	return -EINVAL;
+}
+
+static int pmagbafb_switch(int con, struct fb_info *info)
+{
+	pmagba_do_fb_set_var(&fb_display[con].var, 1);
+	currcon = con;
+
+	return 0;
+}
+
+/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
+
+static void pmagbafb_blank(int blank, struct fb_info *info)
+{
+	/* Not supported */
+}
+
+static int pmagbafb_open(struct fb_info *info, int user)
+{
+	/*
+	 * Nothing, only a usage count for the moment
+	 */
+	MOD_INC_USE_COUNT;
+	return (0);
+}
+
+static void pmagbafb_set_disp(int con, struct pmag_ba_my_fb_info *info)
+{
+	struct fb_fix_screeninfo fix;
+	struct display *display;
+
+	if (con >= 0)
+		display = &fb_display[con];
+	else
+		display = &disp;	/* used during initialization */
+
+	pmagbafb_get_fix(&fix, con, (struct fb_info *) info);
+
+	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->next_line = fix.line_length;
+	display->can_soft_blank = 0;
+	display->inverse = 0;
+
+	display->dispsw = &fbcon_cfb8;
+}
+
+static int pmagbafb_release(struct fb_info *info, int user)
+{
+	MOD_DEC_USE_COUNT;
+	return (0);
+}
+
+static struct fb_ops pmagbafb_ops = {
+	owner:THIS_MODULE,
+	fb_open:pmagbafb_open,
+	fb_release:pmagbafb_release,
+	fb_get_fix:pmagbafb_get_fix,
+	fb_get_var:pmagbafb_get_var,
+	fb_set_var:pmagbafb_set_var,
+	fb_get_cmap:pmagbafb_get_cmap,
+	fb_set_cmap:pmagbafb_set_cmap,
+	fb_ioctl:pmagbafb_ioctl,
+	fb_mmap:0,
+	fb_rasterimg:0
+};
+
+int __init pmagbafb_init_one(int slot)
+{
+	unsigned long base_addr = get_tc_base_addr(slot);
+	struct pmag_ba_my_fb_info *ip =
+	    (struct pmag_ba_my_fb_info *) &pmagba_fb_info[slot];
+
+	printk("PMAG-BA framebuffer in slot %d\n", slot);
+
+	/*
+	 * Framebuffer display memory base address and friends
+	 */
+	ip->bt459_regs =
+	    (struct pmag_ba_ramdac_regs *) (base_addr +
+					    PMAG_BA_BT459_OFFSET);
+	ip->pmagba_fb_start = base_addr + PMAG_BA_ONBOARD_FBMEM_OFFSET;
+	ip->pmagba_fb_size = 1024 * 864;
+	ip->pmagba_fb_line_length = 1024;
+
+	/*
+	 * Configure the Bt459 RAM DAC
+	 */
+	pmagbafb_erase_cursor(ip);
+
+	/*
+	 *      Fill in the available video resolution
+	 */
+
+	pmagbafb_defined.xres = 1024;
+	pmagbafb_defined.yres = 864;
+	pmagbafb_defined.xres_virtual = 1024;
+	pmagbafb_defined.yres_virtual = 864;
+	pmagbafb_defined.bits_per_pixel = 8;
+
+	/*
+	 *      Let there be consoles..
+	 */
+	strcpy(ip->info.modename, "PMAG-BA");
+	ip->info.changevar = NULL;
+	ip->info.node = -1;
+	ip->info.fbops = &pmagbafb_ops;
+	ip->info.disp = &disp;
+	ip->info.switch_con = &pmagbafb_switch;
+	ip->info.updatevar = &pmagba_fb_update_var;
+	ip->info.blank = &pmagbafb_blank;
+	ip->info.flags = FBINFO_FLAG_DEFAULT;
+
+	pmagba_do_fb_set_var(&pmagbafb_defined, 1);
+	pmagbafb_get_var(&disp.var, -1, (struct fb_info *) ip);
+	pmagbafb_set_disp(-1, ip);
+
+	if (register_framebuffer((struct fb_info *) ip) < 0)
+		return 1;
+
+	return 0;
+}
+
+/* 
+ * Initialise the framebuffer
+ */
+
+int __init pmagbafb_init(void)
+{
+	int sid;
+	int found = 0;
+
+	if (TURBOCHANNEL) {
+		while ((sid = search_tc_card("PMAG-BA")) >= 0) {
+			found = 1;
+			claim_tc_card(sid);
+			pmagbafb_init_one(sid);
+		}
+		return found ? 0 : -ENODEV;
+	} else {
+		return -ENODEV;
+	}
+}
+
+int __init pmagbafb_setup(char *options)
+{
+	return 0;
+}