video: Provide constants for VGA I/O range

Provide VGA_FB_ constants for the VGA framebuffer I/O range and convert
fbdev code. In the case of vga16fb, this is a rename of the existing
constants VGA_FB_PHYS and VGA_FB_PHYS_LEN.

v2:
	* clarify relationship with old constants in vga16fb (Javier)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220718072322.8927-9-tzimmermann@suse.de

drivers/video/fbdev/core/fbmem.c

@@ -39,6 +39,7 @@
 
 #include <asm/fb.h>
 
+#include <video/vga.h>
 
     /*
      *  Frame buffer device initialization and setup routines
@@ -1561,7 +1562,6 @@ static bool fb_do_apertures_overlap(struct apertures_struct *gena,
 
 static void do_unregister_framebuffer(struct fb_info *fb_info);
 
-#define VGA_FB_PHYS 0xA0000
 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
 					       const char *name, bool primary)
 {
@@ -1580,7 +1580,7 @@ static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
 		device = registered_fb[i]->device;
 		if (fb_do_apertures_overlap(gen_aper, a) ||
 			(primary && gen_aper && gen_aper->count &&
-			 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
+			 gen_aper->ranges[0].base == VGA_FB_PHYS_BASE)) {
 
 			printk(KERN_INFO "fb%d: switching to %s from %s\n",
 			       i, name, registered_fb[i]->fix.id);

drivers/video/fbdev/vga16fb.c

@@ -25,9 +25,6 @@
 #include <asm/io.h>
 #include <video/vga.h>
 
-#define VGA_FB_PHYS 0xA0000
-#define VGA_FB_PHYS_LEN 65536
-
 #define MODE_SKIP4	1
 #define MODE_8BPP	2
 #define MODE_CFB	4
@@ -87,8 +84,8 @@ static struct fb_var_screeninfo vga16fb_defined = {
 /* name should not depend on EGA/VGA */
 static const struct fb_fix_screeninfo vga16fb_fix = {
 	.id		= "VGA16 VGA",
-	.smem_start	= VGA_FB_PHYS,
-	.smem_len	= VGA_FB_PHYS_LEN,
+	.smem_start	= VGA_FB_PHYS_BASE,
+	.smem_len	= VGA_FB_PHYS_SIZE,
 	.type		= FB_TYPE_VGA_PLANES,
 	.type_aux	= FB_AUX_VGA_PLANES_VGA4,
 	.visual		= FB_VISUAL_PSEUDOCOLOR,
@@ -1333,8 +1330,8 @@ static int vga16fb_probe(struct platform_device *dev)
 		goto err_ioremap;
 	}
 
-	/* XXX share VGA_FB_PHYS and I/O region with vgacon and others */
-	info->screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS, 0);
+	/* XXX share VGA_FB_PHYS_BASE and I/O region with vgacon and others */
+	info->screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS_BASE, 0);
 
 	if (!info->screen_base) {
 		printk(KERN_ERR "vga16fb: unable to map device\n");
@@ -1385,8 +1382,8 @@ static int vga16fb_probe(struct platform_device *dev)
 
 	vga16fb_update_fix(info);
 
-	info->apertures->ranges[0].base = VGA_FB_PHYS;
-	info->apertures->ranges[0].size = VGA_FB_PHYS_LEN;
+	info->apertures->ranges[0].base = VGA_FB_PHYS_BASE;
+	info->apertures->ranges[0].size = VGA_FB_PHYS_SIZE;
 
 	if (register_framebuffer(info) < 0) {
 		printk(KERN_ERR "vga16fb: unable to register framebuffer\n");

include/video/vga.h

@@ -22,6 +22,8 @@
 #include <asm/vga.h>
 #include <asm/byteorder.h>
 
+#define VGA_FB_PHYS_BASE	0xA0000 /* VGA framebuffer I/O base */
+#define VGA_FB_PHYS_SIZE	65536	/* VGA framebuffer I/O size */
 
 /* Some of the code below is taken from SVGAlib.  The original,
    unmodified copyright notice for that code is below. */