video: Handle HAS_IOPORT dependencies

In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
compile time. We thus need to #ifdef functions and their callsites which
unconditionally use these I/O accessors. In the include/video/vga.h
these are conveniently all those functions with the vga_io_* prefix.

Co-developed-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Niklas Schnelle <[e-mail]>
Signed-off-by: Helge Deller <[e-mail]>

include/video/vga.h

···
 extern int save_vga(struct vgastate *state);
 extern int restore_vga(struct vgastate *state);
 
+static inline unsigned char vga_mm_r (void __iomem *regbase, unsigned short port)
+{
+	return readb (regbase + port);
+}
+
+static inline void vga_mm_w (void __iomem *regbase, unsigned short port, unsigned char val)
+{
+	writeb (val, regbase + port);
+}
+
+static inline void vga_mm_w_fast (void __iomem *regbase, unsigned short port,
+				  unsigned char reg, unsigned char val)
+{
+	writew (VGA_OUT16VAL (val, reg), regbase + port);
+}
+
 /*
  * generic VGA port read/write
  */
+#ifdef CONFIG_HAS_IOPORT
 
 static inline unsigned char vga_io_r (unsigned short port)
 {
···
 				  unsigned char val)
 {
 	outw(VGA_OUT16VAL (val, reg), port);
-}
-
-static inline unsigned char vga_mm_r (void __iomem *regbase, unsigned short port)
-{
-	return readb (regbase + port);
-}
-
-static inline void vga_mm_w (void __iomem *regbase, unsigned short port, unsigned char val)
-{
-	writeb (val, regbase + port);
-}
-
-static inline void vga_mm_w_fast (void __iomem *regbase, unsigned short port,
-				  unsigned char reg, unsigned char val)
-{
-	writew (VGA_OUT16VAL (val, reg), regbase + port);
 }
 
 static inline unsigned char vga_r (void __iomem *regbase, unsigned short port)
···
 	else
 		vga_io_w_fast (port, reg, val);
 }
+#else /* CONFIG_HAS_IOPORT */
+static inline unsigned char vga_r (void __iomem *regbase, unsigned short port)
+{
+	return vga_mm_r (regbase, port);
+}
 
+static inline void vga_w (void __iomem *regbase, unsigned short port, unsigned char val)
+{
+	vga_mm_w (regbase, port, val);
+}
+
+
+static inline void vga_w_fast (void __iomem *regbase, unsigned short port,
+			       unsigned char reg, unsigned char val)
+{
+	vga_mm_w_fast (regbase, port, reg, val);
+}
+#endif /* CONFIG_HAS_IOPORT */
 
 /*
  * VGA CRTC register read/write
···
 #endif /* VGA_OUTW_WRITE */
 }
 
+#ifdef CONFIG_HAS_IOPORT
 static inline unsigned char vga_io_rcrt (unsigned char reg)
 {
         vga_io_w (VGA_CRT_IC, reg);
···
         vga_io_w (VGA_CRT_DC, val);
 #endif /* VGA_OUTW_WRITE */
 }
+#endif /* CONFIG_HAS_IOPORT */
 
 static inline unsigned char vga_mm_rcrt (void __iomem *regbase, unsigned char reg)
 {
···
 #endif /* VGA_OUTW_WRITE */
 }
 
+#ifdef CONFIG_HAS_IOPORT
 static inline unsigned char vga_io_rseq (unsigned char reg)
 {
         vga_io_w (VGA_SEQ_I, reg);
···
         vga_io_w (VGA_SEQ_D, val);
 #endif /* VGA_OUTW_WRITE */
 }
+#endif /* CONFIG_HAS_IOPORT */
 
 static inline unsigned char vga_mm_rseq (void __iomem *regbase, unsigned char reg)
 {
···
 #endif /* VGA_OUTW_WRITE */
 }
 
+#ifdef CONFIG_HAS_IOPORT
 static inline unsigned char vga_io_rgfx (unsigned char reg)
 {
         vga_io_w (VGA_GFX_I, reg);
···
         vga_io_w (VGA_GFX_D, val);
 #endif /* VGA_OUTW_WRITE */
 }
+#endif /* CONFIG_HAS_IOPORT */
 
 static inline unsigned char vga_mm_rgfx (void __iomem *regbase, unsigned char reg)
 {
···
         vga_w (regbase, VGA_ATT_W, val);
 }
 
+#ifdef CONFIG_HAS_IOPORT
 static inline unsigned char vga_io_rattr (unsigned char reg)
 {
         vga_io_w (VGA_ATT_IW, reg);
···
         vga_io_w (VGA_ATT_IW, reg);
         vga_io_w (VGA_ATT_W, val);
 }
+#endif /* CONFIG_HAS_IOPORT */
 
 static inline unsigned char vga_mm_rattr (void __iomem *regbase, unsigned char reg)
 {