2018-11-15 09:29:16

by Yinbo Zhu

Subject: [PATCH v1] arch: arm64: add ARM64 specific fucntions required for ehci fsl driver

From: Rajesh Bhagat <[email protected]>

Add set/clear bits functions for ARM platform which are used by ehci fsl
driver

Signed-off-by: Rajesh Bhagat <[email protected]>
Signed-off-by: Yinbo Zhu <[email protected]>
---
arch/arm64/include/asm/io.h | 29 +++++++++++++++++++++++++++++
1 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index e97b861..0dc4334 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -185,6 +185,35 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size);
#define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force __u32)cpu_to_be32(v), p); })
#define iowrite64be(v,p) ({ __iowmb(); __raw_writeq((__force __u64)cpu_to_be64(v), p); })

+/* access ports */
+#define setbits32(_addr, _v) iowrite32be(ioread32be(_addr) | (_v), (_addr))
+#define clrbits32(_addr, _v) iowrite32be(ioread32be(_addr) & ~(_v), (_addr))
+
+#define setbits16(_addr, _v) iowrite16be(ioread16be(_addr) | (_v), (_addr))
+#define clrbits16(_addr, _v) iowrite16be(ioread16be(_addr) & ~(_v), (_addr))
+
+#define setbits8(_addr, _v) iowrite8(ioread8(_addr) | (_v), (_addr))
+#define clrbits8(_addr, _v) iowrite8(ioread8(_addr) & ~(_v), (_addr))
+
+/* Clear and set bits in one shot. These macros can be used to clear and
+ * set multiple bits in a register using a single read-modify-write. These
+ * macros can also be used to set a multiple-bit bit pattern using a mask,
+ * by specifying the mask in the 'clear' parameter and the new bit pattern
+ * in the 'set' parameter.
+ */
+
+#define clrsetbits_be32(addr, clear, set) \
+ iowrite32be((ioread32be(addr) & ~(clear)) | (set), (addr))
+#define clrsetbits_le32(addr, clear, set) \
+ iowrite32le((ioread32le(addr) & ~(clear)) | (set), (addr))
+#define clrsetbits_be16(addr, clear, set) \
+ iowrite16be((ioread16be(addr) & ~(clear)) | (set), (addr))
+#define clrsetbits_le16(addr, clear, set) \
+ iowrite16le((ioread16le(addr) & ~(clear)) | (set), (addr))
+#define clrsetbits_8(addr, clear, set) \
+ iowrite8((ioread8(addr) & ~(clear)) | (set), (addr))
+
+
/*
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
--
1.7.1

2018-11-15 17:49:25

by Will Deacon

Subject: Re: [PATCH v1] arch: arm64: add ARM64 specific fucntions required for ehci fsl driver

On Thu, Nov 15, 2018 at 05:23:57PM +0800, Yinbo Zhu wrote:
> From: Rajesh Bhagat <[email protected]>
>
> Add set/clear bits functions for ARM platform which are used by ehci fsl
> driver
>
> Signed-off-by: Rajesh Bhagat <[email protected]>
> Signed-off-by: Yinbo Zhu <[email protected]>
> ---
> arch/arm64/include/asm/io.h | 29 +++++++++++++++++++++++++++++
> 1 files changed, 29 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
> index e97b861..0dc4334 100644
> --- a/arch/arm64/include/asm/io.h
> +++ b/arch/arm64/include/asm/io.h
> @@ -185,6 +185,35 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size);
> #define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force __u32)cpu_to_be32(v), p); })
> #define iowrite64be(v,p) ({ __iowmb(); __raw_writeq((__force __u64)cpu_to_be64(v), p); })
>
> +/* access ports */
> +#define setbits32(_addr, _v) iowrite32be(ioread32be(_addr) | (_v), (_addr))
> +#define clrbits32(_addr, _v) iowrite32be(ioread32be(_addr) & ~(_v), (_addr))
> +
> +#define setbits16(_addr, _v) iowrite16be(ioread16be(_addr) | (_v), (_addr))
> +#define clrbits16(_addr, _v) iowrite16be(ioread16be(_addr) & ~(_v), (_addr))
> +
> +#define setbits8(_addr, _v) iowrite8(ioread8(_addr) | (_v), (_addr))
> +#define clrbits8(_addr, _v) iowrite8(ioread8(_addr) & ~(_v), (_addr))

Why isn't this defined in the driver? Adding it to the arch-code leads to
duplication of the definitions and encourages other drivers to start using
this weird interface.

So no, I don't want this in the arch code.

Will