From: Joshua Clayton <stillcompiling@gmail.com> To: Alan Tull <atull@kernel.org>, Moritz Fischer <moritz.fischer@ettus.com>, Anatolij Gustschin <agust@denx.de>, Bastian Stender <bst@pengutronix.de>, Shawn Guo <shawnguo@kernel.org>, Joshua Clayton <stillcompiling@gmail.com> Cc: Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Sascha Hauer <kernel@pengutronix.de>, Fabio Estevam <fabio.estevam@nxp.com>, Russell King <linux@armlinux.org.uk>, linux-fpga@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v12 5/6] lib: add bitrev8x4() Date: Fri, 2 Jun 2017 13:30:51 -0700 [thread overview] Message-ID: <7108de698ffdeaa3c61a23997bc0877120bf114e.1496434383.git.stillcompiling@gmail.com> (raw) In-Reply-To: <684ea151ba9aa2c6555a299daf56552ddc11f596.1496434383.git.stillcompiling@gmail.com> In-Reply-To: <20170525172911.11467-1-stillcompiling@gmail.com> Add a function to reverse bytes within a 32 bit word. Operate on a u32 rather than individual bytes. Signed-off-by: Joshua Clayton <stillcompiling@gmail.com> --- include/linux/bitrev.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/include/linux/bitrev.h b/include/linux/bitrev.h index fb790b8449c1..b97be27e5a85 100644 --- a/include/linux/bitrev.h +++ b/include/linux/bitrev.h @@ -29,6 +29,8 @@ static inline u32 __bitrev32(u32 x) #endif /* CONFIG_HAVE_ARCH_BITREVERSE */ +#define __bitrev8x4(x) (__bitrev32(swab32(x))) + #define __constant_bitrev32(x) \ ({ \ u32 __x = x; \ @@ -50,6 +52,15 @@ static inline u32 __bitrev32(u32 x) __x; \ }) +#define __constant_bitrev8x4(x) \ +({ \ + u32 __x = x; \ + __x = ((__x & (u32)0xF0F0F0F0UL) >> 4) | ((__x & (u32)0x0F0F0F0FUL) << 4); \ + __x = ((__x & (u32)0xCCCCCCCCUL) >> 2) | ((__x & (u32)0x33333333UL) << 2); \ + __x = ((__x & (u32)0xAAAAAAAAUL) >> 1) | ((__x & (u32)0x55555555UL) << 1); \ + __x; \ +}) + #define __constant_bitrev8(x) \ ({ \ u8 __x = x; \ @@ -75,6 +86,14 @@ static inline u32 __bitrev32(u32 x) __bitrev16(__x); \ }) +#define bitrev8x4(x) \ +({ \ + u32 __x = x; \ + __builtin_constant_p(__x) ? \ + __constant_bitrev8x4(__x) : \ + __bitrev8x4(__x); \ + }) + #define bitrev8(x) \ ({ \ u8 __x = x; \ -- 2.11.0
WARNING: multiple messages have this Message-ID (diff)
From: stillcompiling@gmail.com (Joshua Clayton) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v12 5/6] lib: add bitrev8x4() Date: Fri, 2 Jun 2017 13:30:51 -0700 [thread overview] Message-ID: <7108de698ffdeaa3c61a23997bc0877120bf114e.1496434383.git.stillcompiling@gmail.com> (raw) In-Reply-To: <684ea151ba9aa2c6555a299daf56552ddc11f596.1496434383.git.stillcompiling@gmail.com> Add a function to reverse bytes within a 32 bit word. Operate on a u32 rather than individual bytes. Signed-off-by: Joshua Clayton <stillcompiling@gmail.com> --- include/linux/bitrev.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/include/linux/bitrev.h b/include/linux/bitrev.h index fb790b8449c1..b97be27e5a85 100644 --- a/include/linux/bitrev.h +++ b/include/linux/bitrev.h @@ -29,6 +29,8 @@ static inline u32 __bitrev32(u32 x) #endif /* CONFIG_HAVE_ARCH_BITREVERSE */ +#define __bitrev8x4(x) (__bitrev32(swab32(x))) + #define __constant_bitrev32(x) \ ({ \ u32 __x = x; \ @@ -50,6 +52,15 @@ static inline u32 __bitrev32(u32 x) __x; \ }) +#define __constant_bitrev8x4(x) \ +({ \ + u32 __x = x; \ + __x = ((__x & (u32)0xF0F0F0F0UL) >> 4) | ((__x & (u32)0x0F0F0F0FUL) << 4); \ + __x = ((__x & (u32)0xCCCCCCCCUL) >> 2) | ((__x & (u32)0x33333333UL) << 2); \ + __x = ((__x & (u32)0xAAAAAAAAUL) >> 1) | ((__x & (u32)0x55555555UL) << 1); \ + __x; \ +}) + #define __constant_bitrev8(x) \ ({ \ u8 __x = x; \ @@ -75,6 +86,14 @@ static inline u32 __bitrev32(u32 x) __bitrev16(__x); \ }) +#define bitrev8x4(x) \ +({ \ + u32 __x = x; \ + __builtin_constant_p(__x) ? \ + __constant_bitrev8x4(__x) : \ + __bitrev8x4(__x); \ + }) + #define bitrev8(x) \ ({ \ u8 __x = x; \ -- 2.11.0
next prev parent reply other threads:[~2017-06-02 20:31 UTC|newest] Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-05-25 17:29 [PATCH v11 0/6] FPGA Manager support for altera passive serial Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` [PATCH v11 1/6] fpga: Add flag to indicate SPI bitstream is bit-reversed Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` [PATCH v11 2/6] doc: dt: add altera-ps-spi binding document Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` [PATCH v11 3/6] fpga manager: Add altera-ps-spi driver for Altera FPGAs Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` [PATCH v11 4/6] ARM: dts: imx6q-evi: support altera-ps-spi Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-06-02 16:30 ` Andreas Färber 2017-06-02 16:30 ` Andreas Färber 2017-06-02 16:30 ` Andreas Färber 2017-06-02 19:39 ` stillcompiling 2017-06-02 19:39 ` stillcompiling at gmail.com 2017-06-02 19:39 ` stillcompiling-Re5JQEeQqe8AvxtiuMwx3w 2017-06-02 19:54 ` Andreas Färber 2017-06-02 19:54 ` Andreas Färber 2017-06-02 19:54 ` Andreas Färber 2017-06-02 21:10 ` stillcompiling 2017-06-02 21:10 ` stillcompiling at gmail.com 2017-06-02 21:10 ` stillcompiling-Re5JQEeQqe8AvxtiuMwx3w 2017-06-05 15:10 ` Alan Tull 2017-06-05 15:10 ` Alan Tull 2017-06-05 15:10 ` Alan Tull 2017-05-25 17:29 ` [PATCH v11 5/6] lib: add bitrev8x4() Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` [PATCH v11 6/6] fpga-manager: altera-ps-spi: use bitrev8x4 Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-05-25 17:29 ` Joshua Clayton 2017-06-02 15:49 ` [PATCH v11 0/6] FPGA Manager support for altera passive serial Anatolij Gustschin 2017-06-02 15:49 ` Anatolij Gustschin 2017-06-02 15:49 ` Anatolij Gustschin 2017-06-02 20:30 ` [PATCH v12 1/6] fpga: Add flag to indicate SPI bitstream is bit-reversed Joshua Clayton 2017-06-02 20:30 ` Joshua Clayton 2017-06-02 20:30 ` Joshua Clayton 2017-06-05 15:11 ` Alan Tull 2017-06-05 15:11 ` Alan Tull 2017-06-05 15:11 ` Alan Tull 2017-06-02 20:30 ` [PATCH v12 2/6] doc: dt: document altera-passive-serial binding Joshua Clayton 2017-06-02 20:30 ` Joshua Clayton 2017-06-05 15:11 ` Alan Tull 2017-06-05 15:11 ` Alan Tull 2017-06-05 15:11 ` Alan Tull 2017-06-02 20:30 ` [PATCH v12 3/6] fpga manager: Add altera-ps-spi driver for Altera FPGAs Joshua Clayton 2017-06-02 20:30 ` Joshua Clayton 2017-06-02 20:30 ` Joshua Clayton 2017-06-05 15:11 ` Alan Tull 2017-06-05 15:11 ` Alan Tull 2017-06-05 15:11 ` Alan Tull 2017-06-02 20:30 ` [PATCH v12 4/6] ARM: dts: imx6q-evi: support altera-ps-spi Joshua Clayton 2017-06-02 20:30 ` Joshua Clayton 2017-06-05 15:12 ` Alan Tull 2017-06-05 15:12 ` Alan Tull 2017-06-05 15:12 ` Alan Tull 2017-06-02 20:30 ` Joshua Clayton [this message] 2017-06-02 20:30 ` [PATCH v12 5/6] lib: add bitrev8x4() Joshua Clayton 2017-06-05 15:12 ` Alan Tull 2017-06-05 15:12 ` Alan Tull 2017-06-05 15:12 ` Alan Tull 2017-06-02 20:30 ` [PATCH v12 6/6] fpga-manager: altera-ps-spi: use bitrev8x4 Joshua Clayton 2017-06-02 20:30 ` Joshua Clayton 2017-06-05 15:13 ` Alan Tull 2017-06-05 15:13 ` Alan Tull 2017-06-05 15:13 ` Alan Tull
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