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From: Niklas Schnelle <schnelle@linux.ibm.com>
To: Helge Deller <deller@gmx.de>
Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
        Arnd Bergmann <arnd@kernel.org>, Heiko Carstens <hca@linux.ibm.com>,
        linux-kernel@vger.kernel.org, Niklas Schnelle <schnelle@linux.ibm.com>
Subject: [PATCH 1/1] video: Handle HAS_IOPORT dependencies
Date: Wed, 10 Apr 2024 16:23:29 +0200
Message-Id: <20240410142329.3567824-2-schnelle@linux.ibm.com>
In-Reply-To: <20240410142329.3567824-1-schnelle@linux.ibm.com>
References: <20240410142329.3567824-1-schnelle@linux.ibm.com>
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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 <arnd@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
---
Note: This patch does not depend any not-yet-mainline HAS_IOPORT changes
and may be merged via subsystem specific trees at your earliest
convenience.

 include/video/vga.h | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/include/video/vga.h b/include/video/vga.h
index 947c0abd04ef..ed89295941c4 100644
--- a/include/video/vga.h
+++ b/include/video/vga.h
@@ -201,6 +201,7 @@ extern int restore_vga(struct vgastate *state);
  * generic VGA port read/write
  */
 
+#ifdef CONFIG_HAS_IOPORT
 static inline unsigned char vga_io_r (unsigned short port)
 {
 	return inb_p(port);
@@ -210,12 +211,12 @@ static inline void vga_io_w (unsigned short port, unsigned char val)
 {
 	outb_p(val, port);
 }
-
 static inline void vga_io_w_fast (unsigned short port, unsigned char reg,
 				  unsigned char val)
 {
 	outw(VGA_OUT16VAL (val, reg), port);
 }
+#endif /* CONFIG_HAS_IOPORT */
 
 static inline unsigned char vga_mm_r (void __iomem *regbase, unsigned short port)
 {
@@ -235,28 +236,34 @@ static inline void vga_mm_w_fast (void __iomem *regbase, unsigned short port,
 
 static inline unsigned char vga_r (void __iomem *regbase, unsigned short port)
 {
-	if (regbase)
-		return vga_mm_r (regbase, port);
-	else
+#ifdef CONFIG_HAS_IOPORT
+	if (!regbase)
 		return vga_io_r (port);
+	else
+#endif /* CONFIG_HAS_IOPORT */
+		return vga_mm_r (regbase, port);
 }
 
 static inline void vga_w (void __iomem *regbase, unsigned short port, unsigned char val)
 {
-	if (regbase)
-		vga_mm_w (regbase, port, val);
-	else
+#ifdef CONFIG_HAS_IOPORT
+	if (!regbase)
 		vga_io_w (port, val);
+	else
+#endif /* CONFIG_HAS_IOPORT */
+		vga_mm_w (regbase, port, val);
 }
 
 
 static inline void vga_w_fast (void __iomem *regbase, unsigned short port,
 			       unsigned char reg, unsigned char val)
 {
-	if (regbase)
-		vga_mm_w_fast (regbase, port, reg, val);
-	else
+#ifdef CONFIG_HAS_IOPORT
+	if (!regbase)
 		vga_io_w_fast (port, reg, val);
+	else
+#endif /* CONFIG_HAS_IOPORT */
+		vga_mm_w_fast (regbase, port, reg, val);
 }
 
 
@@ -280,6 +287,7 @@ static inline void vga_wcrt (void __iomem *regbase, unsigned char reg, unsigned
 #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);
@@ -295,6 +303,7 @@ static inline void vga_io_wcrt (unsigned char reg, unsigned char val)
         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)
 {
@@ -333,6 +342,7 @@ static inline void vga_wseq (void __iomem *regbase, unsigned char reg, unsigned
 #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);
@@ -348,6 +358,7 @@ static inline void vga_io_wseq (unsigned char reg, unsigned char val)
         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)
 {
@@ -385,6 +396,7 @@ static inline void vga_wgfx (void __iomem *regbase, unsigned char reg, unsigned
 #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);
@@ -400,6 +412,7 @@ static inline void vga_io_wgfx (unsigned char reg, unsigned char val)
         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)
 {
@@ -434,6 +447,7 @@ static inline void vga_wattr (void __iomem *regbase, unsigned char reg, unsigned
         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);
@@ -445,6 +459,7 @@ static inline void vga_io_wattr (unsigned char reg, unsigned char val)
         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)
 {
-- 
2.40.1