From: Thomas Zimmermann <tzimmermann@suse.de>
To: deller@gmx.de, geert@linux-m68k.org, javierm@redhat.com,
daniel@ffwll.ch, vgupta@kernel.org, chenhuacai@kernel.org,
kernel@xen0n.name, davem@davemloft.net,
James.Bottomley@HansenPartnership.com, arnd@arndb.de,
sam@ravnborg.org
Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-arch@vger.kernel.org, linux-snps-arc@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org,
loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org,
sparclinux@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-parisc@vger.kernel.org,
Thomas Zimmermann <tzimmermann@suse.de>
Subject: [PATCH v3 5/6] fbdev: Move framebuffer I/O helpers into <asm/fb.h>
Date: Tue, 2 May 2023 15:02:22 +0200 [thread overview]
Message-ID: <20230502130223.14719-6-tzimmermann@suse.de> (raw)
In-Reply-To: <20230502130223.14719-1-tzimmermann@suse.de>
Implement framebuffer I/O helpers, such as fb_read*() and fb_write*(),
in the architecture's <asm/fb.h> header file or the generic one.
The common case has been the use of regular I/O functions, such as
__raw_readb() or memset_io(). A few architectures used plain system-
memory reads and writes. Sparc used helpers for its SBus.
The architectures that used special cases provide the same code in
their __raw_*() I/O helpers. So the patch replaces this code with the
__raw_*() functions and moves it to <asm-generic/fb.h> for all
architectures.
v3:
* implement all architectures with generic helpers
* support reordering and native byte order (Geert, Arnd)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
include/asm-generic/fb.h | 101 +++++++++++++++++++++++++++++++++++++++
include/linux/fb.h | 53 --------------------
2 files changed, 101 insertions(+), 53 deletions(-)
diff --git a/include/asm-generic/fb.h b/include/asm-generic/fb.h
index 6922dd248c51..0540eccdbeca 100644
--- a/include/asm-generic/fb.h
+++ b/include/asm-generic/fb.h
@@ -31,4 +31,105 @@ static inline int fb_is_primary_device(struct fb_info *info)
}
#endif
+/*
+ * I/O helpers for the framebuffer. Prefer these functions over their
+ * regular counterparts. The regular I/O functions provide in-order
+ * access and swap bytes to/from little-endian ordering. Neither is
+ * required for framebuffers. Instead, the helpers read and write
+ * raw framebuffer data. Independent operations can be reordered for
+ * improved performance.
+ */
+
+#ifndef fb_readb
+static inline u8 fb_readb(const volatile void __iomem *addr)
+{
+ return __raw_readb(addr);
+}
+#define fb_readb fb_readb
+#endif
+
+#ifndef fb_readw
+static inline u16 fb_readw(const volatile void __iomem *addr)
+{
+ return __raw_readw(addr);
+}
+#define fb_readw fb_readw
+#endif
+
+#ifndef fb_readl
+static inline u32 fb_readl(const volatile void __iomem *addr)
+{
+ return __raw_readl(addr);
+}
+#define fb_readl fb_readl
+#endif
+
+#ifndef fb_readq
+#if defined(__raw_readq)
+static inline u64 fb_readq(const volatile void __iomem *addr)
+{
+ return __raw_readq(addr);
+}
+#define fb_readq fb_readq
+#endif
+#endif
+
+#ifndef fb_writeb
+static inline void fb_writeb(u8 b, volatile void __iomem *addr)
+{
+ __raw_writeb(b, addr);
+}
+#define fb_writeb fb_writeb
+#endif
+
+#ifndef fb_writew
+static inline void fb_writew(u16 b, volatile void __iomem *addr)
+{
+ __raw_writew(b, addr);
+}
+#define fb_writew fb_writew
+#endif
+
+#ifndef fb_writel
+static inline void fb_writel(u32 b, volatile void __iomem *addr)
+{
+ __raw_writel(b, addr);
+}
+#define fb_writel fb_writel
+#endif
+
+#ifndef fb_writeq
+#if defined(__raw_writeq)
+static inline void fb_writeq(u64 b, volatile void __iomem *addr)
+{
+ __raw_writeq(b, addr);
+}
+#define fb_writeq fb_writeq
+#endif
+#endif
+
+#ifndef fb_memcpy_fromfb
+static inline void fb_memcpy_fromfb(void *to, const volatile void __iomem *from, size_t n)
+{
+ memcpy_fromio(to, from, n);
+}
+#define fb_memcpy_fromfb fb_memcpy_fromfb
+#endif
+
+#ifndef fb_memcpy_tofb
+static inline void fb_memcpy_tofb(volatile void __iomem *to, const void *from, size_t n)
+{
+ memcpy_toio(to, from, n);
+}
+#define fb_memcpy_tofb fb_memcpy_tofb
+#endif
+
+#ifndef fb_memset
+static inline void fb_memset(volatile void __iomem *addr, int c, size_t n)
+{
+ memset_io(addr, c, n);
+}
+#define fb_memset fb_memset
+#endif
+
#endif /* __ASM_GENERIC_FB_H_ */
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 08cb47da71f8..7d80ee62a9d5 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -15,7 +15,6 @@
#include <linux/list.h>
#include <linux/backlight.h>
#include <linux/slab.h>
-#include <asm/io.h>
struct vm_area_struct;
struct fb_info;
@@ -511,58 +510,6 @@ struct fb_info {
*/
#define STUPID_ACCELF_TEXT_SHIT
-// This will go away
-#if defined(__sparc__)
-
-/* We map all of our framebuffers such that big-endian accesses
- * are what we want, so the following is sufficient.
- */
-
-// This will go away
-#define fb_readb sbus_readb
-#define fb_readw sbus_readw
-#define fb_readl sbus_readl
-#define fb_readq sbus_readq
-#define fb_writeb sbus_writeb
-#define fb_writew sbus_writew
-#define fb_writel sbus_writel
-#define fb_writeq sbus_writeq
-#define fb_memset sbus_memset_io
-#define fb_memcpy_fromfb sbus_memcpy_fromio
-#define fb_memcpy_tofb sbus_memcpy_toio
-
-#elif defined(__i386__) || defined(__alpha__) || defined(__x86_64__) || \
- defined(__hppa__) || defined(__sh__) || defined(__powerpc__) || \
- defined(__arm__) || defined(__aarch64__) || defined(__mips__)
-
-#define fb_readb __raw_readb
-#define fb_readw __raw_readw
-#define fb_readl __raw_readl
-#define fb_readq __raw_readq
-#define fb_writeb __raw_writeb
-#define fb_writew __raw_writew
-#define fb_writel __raw_writel
-#define fb_writeq __raw_writeq
-#define fb_memset memset_io
-#define fb_memcpy_fromfb memcpy_fromio
-#define fb_memcpy_tofb memcpy_toio
-
-#else
-
-#define fb_readb(addr) (*(volatile u8 *) (addr))
-#define fb_readw(addr) (*(volatile u16 *) (addr))
-#define fb_readl(addr) (*(volatile u32 *) (addr))
-#define fb_readq(addr) (*(volatile u64 *) (addr))
-#define fb_writeb(b,addr) (*(volatile u8 *) (addr) = (b))
-#define fb_writew(b,addr) (*(volatile u16 *) (addr) = (b))
-#define fb_writel(b,addr) (*(volatile u32 *) (addr) = (b))
-#define fb_writeq(b,addr) (*(volatile u64 *) (addr) = (b))
-#define fb_memset memset
-#define fb_memcpy_fromfb memcpy
-#define fb_memcpy_tofb memcpy
-
-#endif
-
#define FB_LEFT_POS(p, bpp) (fb_be_math(p) ? (32 - (bpp)) : 0)
#define FB_SHIFT_HIGH(p, val, bits) (fb_be_math(p) ? (val) >> (bits) : \
(val) << (bits))
--
2.40.1
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next prev parent reply other threads:[~2023-05-02 13:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-02 13:02 [PATCH v3 0/6] fbdev: Move framebuffer I/O helpers to <asm/fb.h> Thomas Zimmermann
2023-05-02 13:02 ` [PATCH v3 1/6] fbdev/matrox: Remove trailing whitespaces Thomas Zimmermann
2023-05-02 13:02 ` [PATCH v3 2/6] ipu-v3: Include <linux/io.h> Thomas Zimmermann
2023-05-02 13:02 ` [PATCH v3 3/6] fbdev: Include <linux/io.h> in various drivers Thomas Zimmermann
2023-05-02 13:02 ` [PATCH v3 4/6] fbdev: Include <linux/io.h> via <asm/fb.h> Thomas Zimmermann
2023-05-02 19:54 ` Sam Ravnborg
2023-05-03 7:09 ` Thomas Zimmermann
2023-05-03 7:19 ` Javier Martinez Canillas
2023-05-03 8:09 ` Geert Uytterhoeven
2023-05-03 8:12 ` Thomas Zimmermann
2023-05-03 8:52 ` Arnd Bergmann
2023-05-02 13:02 ` Thomas Zimmermann [this message]
2023-05-02 20:03 ` [PATCH v3 5/6] fbdev: Move framebuffer I/O helpers into <asm/fb.h> Sam Ravnborg
2023-05-03 6:58 ` Thomas Zimmermann
2023-05-03 19:03 ` Sam Ravnborg
2023-05-02 20:06 ` Arnd Bergmann
2023-05-03 14:55 ` Thomas Zimmermann
2023-05-03 15:06 ` Arnd Bergmann
2023-05-02 13:02 ` [PATCH v3 6/6] fbdev: Rename fb_mem*() helpers Thomas Zimmermann
2023-05-02 20:08 ` Sam Ravnborg
2023-05-03 8:15 ` Thomas Zimmermann
2023-05-03 19:06 ` Sam Ravnborg
2023-05-03 8:21 ` [PATCH v3 0/6] fbdev: Move framebuffer I/O helpers to <asm/fb.h> Geert Uytterhoeven
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