patch-2.1.16 linux/drivers/sbus/char/bwtwo.c

• Lines: 109
• Date: Fri Dec 13 11:37:32 1996
• Orig file: v2.1.15/linux/drivers/sbus/char/bwtwo.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.15/linux/drivers/sbus/char/bwtwo.c linux/drivers/sbus/char/bwtwo.c
@@ -0,0 +1,108 @@
+/* $Id: bwtwo.c,v 1.8 1996/11/23 19:54:05 ecd Exp $
+ * bwtwo.c: bwtwo console driver
+ *
+ * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
+ */
+
+#include <linux/kd.h>
+#include <linux/tty.h>
+#include <linux/malloc.h>
+
+#include <asm/sbus.h>
+#include <asm/io.h>
+#include <asm/fbio.h>
+#include <asm/pgtable.h>
+
+#include "../../char/vt_kern.h"
+#include "../../char/selection.h"
+#include "../../char/console_struct.h"
+#include "fb.h"
+#include "cg_common.h"
+
+/* OBio addresses for the bwtwo registers */
+#define BWTWO_REGISTER_OFFSET 0x400000
+
+struct bwtwo_regs {
+	__volatile__ struct bt_regs	bt;
+	__volatile__ __u8		control;
+	__volatile__ __u8		status;
+	__volatile__ __u8		cursor_start;
+	__volatile__ __u8		cursor_end;
+	__volatile__ __u8		vcontrol[12];
+};
+
+/* Control Register Constants */
+#define BWTWO_CTL_ENABLE_INTS   0x80
+#define BWTWO_CTL_ENABLE_VIDEO  0x40
+#define BWTWO_CTL_ENABLE_TIMING 0x20
+#define BWTWO_CTL_ENABLE_CURCMP 0x10
+#define BWTWO_CTL_XTAL_MASK     0x0C
+#define BWTWO_CTL_DIVISOR_MASK  0x03
+
+/* Status Register Constants */
+#define BWTWO_STAT_PENDING_INT  0x80
+#define BWTWO_STAT_MSENSE_MASK  0x70
+#define BWTWO_STAT_ID_MASK      0x0f
+
+
+static int
+bwtwo_mmap (struct inode *inode, struct file *file, struct vm_area_struct *vma,
+	    long base, fbinfo_t *fb)
+{
+	uint size, map_offset, r;
+	int map_size;
+	
+	map_size = size = vma->vm_end - vma->vm_start;
+	
+	if (vma->vm_offset & ~PAGE_MASK)
+		return -ENXIO;
+
+	/* To stop the swapper from even considering these pages */
+	vma->vm_flags |= FB_MMAP_VM_FLAGS;
+
+	/* This routine should also map the register if asked for,
+	 * but we don't do that yet.
+	 */
+	map_offset = get_phys ((uint) fb->base);
+	r = io_remap_page_range (vma->vm_start, map_offset, map_size,
+				 vma->vm_page_prot, fb->space);
+	if (r) return -EAGAIN;
+	vma->vm_inode = inode;
+	inode->i_count++;
+	return 0;
+}
+
+static void
+bwtwo_blank (fbinfo_t *fb)
+{
+	fb->info.bwtwo.regs->control &= ~BWTWO_CTL_ENABLE_VIDEO;
+}
+
+static void
+bwtwo_unblank (fbinfo_t *fb)
+{
+	fb->info.bwtwo.regs->control |= BWTWO_CTL_ENABLE_VIDEO;
+}
+
+__initfunc(void bwtwo_setup (fbinfo_t *fb, int slot, uint bwtwo, int bw2_io))
+{
+	printk ("bwtwo%d at 0x%8.8x\n", slot, bwtwo);
+	fb->type.fb_cmsize = 0;
+	fb->mmap = bwtwo_mmap;
+	fb->loadcmap = 0;
+	fb->ioctl = 0;
+	fb->reset = 0;
+	fb->blank = bwtwo_blank;
+	fb->unblank = bwtwo_unblank;
+	fb->info.bwtwo.regs = sparc_alloc_io ((void *)bwtwo +
+		BWTWO_REGISTER_OFFSET, 0, sizeof (struct bwtwo_regs),
+		"bwtwo_regs", bw2_io, 0);
+	if(!fb->base)
+		fb->base = (unsigned long) sparc_alloc_io((void *)bwtwo, 0,
+		  ((fb->type.fb_depth*fb->type.fb_height*fb->type.fb_width)/8),
+		  "bwtwo_fbase", bw2_io, 0);
+
+	if (slot && sun_prom_console_id != slot)
+		bwtwo_blank (fb);
+}
+