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authorPaul Burton <paul.burton@imgtec.com>2017-08-12 21:36:15 -0700
committerRalf Baechle <ralf@linux-mips.org>2017-09-04 13:53:14 +0200
commitd8c825e2a05390efa4a5750c5c17e168139c1d48 (patch)
treed4838fdfa7faccde33dcce4bc3261e818d448309 /arch/mips/lib
parent9762d2e6d329a500dc6c07156e3c56aab3992471 (diff)
downloadlinux-d8c825e2a05390efa4a5750c5c17e168139c1d48.tar.gz
MIPS: Add __ioread64_copy
We currently have __ioread32_copy, __iowrite32_copy & __iowrite64_copy helpers in lib/iomap_copy.c. This patch adds __ioread64_copy to round out the set, allowing copies from I/O memory using 32 or 64 bit reads. [ralf@linux-mips.org: Changed to move all the code of this patch to be applied to arch/mips temporarily.] Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/17025/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/lib')
-rw-r--r--arch/mips/lib/Makefile2
-rw-r--r--arch/mips/lib/iomap_copy.c42
2 files changed, 43 insertions, 1 deletions
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index a37fe3d1ee2f..6ab430d24575 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -6,7 +6,7 @@ lib-y += bitops.o csum_partial.o delay.o memcpy.o memset.o \
mips-atomic.o strncpy_user.o \
strnlen_user.o uncached.o
-obj-y += iomap.o
+obj-y += iomap.o iomap_copy.o
obj-$(CONFIG_PCI) += iomap-pci.o
lib-$(CONFIG_GENERIC_CSUM) := $(filter-out csum_partial.o, $(lib-y))
diff --git a/arch/mips/lib/iomap_copy.c b/arch/mips/lib/iomap_copy.c
new file mode 100644
index 000000000000..368bb38267c5
--- /dev/null
+++ b/arch/mips/lib/iomap_copy.c
@@ -0,0 +1,42 @@
+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/export.h>
+#include <linux/io.h>
+
+/**
+ * __ioread64_copy - copy data from MMIO space, in 64-bit units
+ * @to: destination (must be 64-bit aligned)
+ * @from: source, in MMIO space (must be 64-bit aligned)
+ * @count: number of 64-bit quantities to copy
+ *
+ * Copy data from MMIO space to kernel space, in units of 32 or 64 bits at a
+ * time. Order of access is not guaranteed, nor is a memory barrier
+ * performed afterwards.
+ */
+void __ioread64_copy(void *to, const void __iomem *from, size_t count)
+{
+#ifdef CONFIG_64BIT
+ u64 *dst = to;
+ const u64 __iomem *src = from;
+ const u64 __iomem *end = src + count;
+
+ while (src < end)
+ *dst++ = __raw_readq(src++);
+#else
+ __ioread32_copy(to, from, count * 2);
+#endif
+}
+EXPORT_SYMBOL_GPL(__ioread64_copy);