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Message-Id: <20240410142329.3567824-2-schnelle@linux.ibm.com>
Date: Wed, 10 Apr 2024 16:23:29 +0200
From: Niklas Schnelle <schnelle@...ux.ibm.com>
To: Helge Deller <deller@....de>
Cc: linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
Arnd Bergmann <arnd@...nel.org>, Heiko Carstens <hca@...ux.ibm.com>,
linux-kernel@...r.kernel.org, Niklas Schnelle <schnelle@...ux.ibm.com>
Subject: [PATCH 1/1] 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 <arnd@...nel.org>
Signed-off-by: Arnd Bergmann <arnd@...nel.org>
Signed-off-by: Niklas Schnelle <schnelle@...ux.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
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