From: Ahmad Fatoum <a.fatoum@pengutronix.de> To: Renaud Barbier <renaud.barbier@abaco.com>, barebox@lists.infradead.org Subject: Re: [PATCH 2/4] arm: 64-bit device specific operation Date: Thu, 29 Jul 2021 12:00:54 +0200 Message-ID: <9c9768c8-a44a-9bd4-ee66-730702a722f6@pengutronix.de> (raw) In-Reply-To: <1627476428-16318-3-git-send-email-renaud.barbier@abaco.com> On 28.07.21 14:47, Renaud Barbier wrote: > In preparation for the introduction of the NXP FSL IFC > nand driver, add memcpy_ directional I/O operation. > > Code based on NXP Linux support: > git://source.codeaurora.org/external/qoriq/qoriq-components/linux barebox next branch already contains cbd23110fca5 ("ARM64: Implement mem*_*io()"), so I think you can drop this patch here. > > Signed-off-by: Renaud Barbier <renaud.barbier@abaco.com> > --- > arch/arm/lib64/Makefile | 2 +- > arch/arm/lib64/io.c | 98 +++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 99 insertions(+), 1 deletion(-) > create mode 100644 arch/arm/lib64/io.c > > diff --git a/arch/arm/lib64/Makefile b/arch/arm/lib64/Makefile > index 69cb3d8ea1..591727c160 100644 > --- a/arch/arm/lib64/Makefile > +++ b/arch/arm/lib64/Makefile > @@ -1,4 +1,4 @@ > -obj-y += stacktrace.o > +obj-y += stacktrace.o io.o > obj-$(CONFIG_ARM_LINUX) += armlinux.o > obj-y += div0.o > obj-$(CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS) += memcpy.o > diff --git a/arch/arm/lib64/io.c b/arch/arm/lib64/io.c > new file mode 100644 > index 0000000000..693cda42b0 > --- /dev/null > +++ b/arch/arm/lib64/io.c > @@ -0,0 +1,98 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Based on arch/arm/kernel/io.c > + * > + * Copyright (C) 2012 ARM Ltd. > + */ > + > +#include <module.h> > +#include <linux/kernel.h> > +#include <linux/types.h> > +#include <io.h> > + > +/* > + * Copy data from IO memory space to "real" memory space. > + */ > +void memcpy_fromio(void *to, const volatile void __iomem *from, size_t count) > +{ > + while (count && !IS_ALIGNED((unsigned long)from, 8)) { > + *(u8 *)to = __raw_readb(from); > + from++; > + to++; > + count--; > + } > + > + while (count >= 8) { > + *(u64 *)to = __raw_readq(from); > + from += 8; > + to += 8; > + count -= 8; > + } > + > + while (count) { > + *(u8 *)to = __raw_readb(from); > + from++; > + to++; > + count--; > + } > +} > +EXPORT_SYMBOL(memcpy_fromio); > + > +/* > + * Copy data from "real" memory space to IO memory space. > + */ > +void memcpy_toio(volatile void __iomem *to, const void *from, size_t count) > +{ > + while (count && !IS_ALIGNED((unsigned long)to, 8)) { > + __raw_writeb(*(u8 *)from, to); > + from++; > + to++; > + count--; > + } > + > + while (count >= 8) { > + __raw_writeq(*(u64 *)from, to); > + from += 8; > + to += 8; > + count -= 8; > + } > + > + while (count) { > + __raw_writeb(*(u8 *)from, to); > + from++; > + to++; > + count--; > + } > +} > +EXPORT_SYMBOL(memcpy_toio); > + > +/* > + * "memset" on IO memory space. > + */ > +void memset_io(volatile void __iomem *dst, int c, size_t count) > +{ > + u64 qc = (u8)c; > + > + qc |= qc << 8; > + qc |= qc << 16; > + qc |= qc << 32; > + > + while (count && !IS_ALIGNED((unsigned long)dst, 8)) { > + __raw_writeb(c, dst); > + dst++; > + count--; > + } > + > + while (count >= 8) { > + __raw_writeq(qc, dst); > + dst += 8; > + count -= 8; > + } > + > + while (count) { > + __raw_writeb(c, dst); > + dst++; > + count--; > + } > +} > +EXPORT_SYMBOL(memset_io); > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox
next prev parent reply other threads:[~2021-07-29 10:02 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-28 12:47 [PATCH 0/4] NXP IFC nand driver Renaud Barbier 2021-07-28 12:47 ` [PATCH 1/4] ARM: atomic.h: add 64-bit counter support Renaud Barbier 2021-07-29 9:58 ` Ahmad Fatoum 2021-07-28 12:47 ` [PATCH 2/4] arm: 64-bit device specific operation Renaud Barbier 2021-07-29 10:00 ` Ahmad Fatoum [this message] 2021-07-28 12:47 ` [PATCH 3/4] nand: add NXP IFC nand driver Renaud Barbier 2021-07-29 10:11 ` Ahmad Fatoum 2021-07-28 12:47 ` [PATCH 4/4] ls1046ardb: enable IFC NAND Renaud Barbier 2021-07-29 10:13 ` Ahmad Fatoum 2021-07-29 18:19 ` Barbier, Renaud
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