From: Mateusz Holenko <mholenko@antmicro.com>
To: Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
devicetree@vger.kernel.org, linux-serial@vger.kernel.org
Cc: Stafford Horne <shorne@gmail.com>,
Karol Gugala <kgugala@antmicro.com>,
Mateusz Holenko <mholenko@antmicro.com>,
Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Paul E. McKenney" <paulmck@linux.ibm.com>,
Filip Kokosinski <fkokosinski@internships.antmicro.com>,
Joel Stanley <joel@jms.id.au>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Maxime Ripard <mripard@kernel.org>,
Shawn Guo <shawnguo@kernel.org>, Heiko Stuebner <heiko@sntech.de>,
Sam Ravnborg <sam@ravnborg.org>, Icenowy Zheng <icenowy@aosc.io>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/4] litex: add common LiteX header
Date: Wed, 23 Oct 2019 11:47:04 +0200 [thread overview]
Message-ID: <20191023114634.13657-2-mholenko@antmicro.com> (raw)
In-Reply-To: <20191023114634.13657-0-mholenko@antmicro.com>
It provides helper CSR access functions used by all
LiteX drivers.
Signed-off-by: Mateusz Holenko <mholenko@antmicro.com>
---
This commit has been introduced in v2 of the patchset.
MAINTAINERS | 6 +++++
include/linux/litex.h | 59 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 65 insertions(+)
create mode 100644 include/linux/litex.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 296de2b51c83..eaa51209bfb2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9493,6 +9493,12 @@ F: Documentation/misc-devices/lis3lv02d.rst
F: drivers/misc/lis3lv02d/
F: drivers/platform/x86/hp_accel.c
+LITEX PLATFORM
+M: Karol Gugala <kgugala@antmicro.com>
+M: Mateusz Holenko <mholenko@antmicro.com>
+S: Maintained
+F: include/linux/litex.h
+
LIVE PATCHING
M: Josh Poimboeuf <jpoimboe@redhat.com>
M: Jiri Kosina <jikos@kernel.org>
diff --git a/include/linux/litex.h b/include/linux/litex.h
new file mode 100644
index 000000000000..e793d2d7c881
--- /dev/null
+++ b/include/linux/litex.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Common LiteX header providing
+ * helper functions for accessing CSRs.
+ *
+ * Copyright (C) 2019 Antmicro <www.antmicro.com>
+ */
+
+#ifndef _LINUX_LITEX_H
+#define _LINUX_LITEX_H
+
+#include <linux/io.h>
+#include <linux/types.h>
+#include <linux/compiler_types.h>
+
+#define LITEX_REG_SIZE 0x4
+#define LITEX_SUBREG_SIZE 0x1
+#define LITEX_SUBREG_SIZE_BIT (LITEX_SUBREG_SIZE * 8)
+
+#ifdef __LITTLE_ENDIAN
+# define LITEX_READ_REG(addr) ioread32(addr)
+# define LITEX_READ_REG_OFF(addr, off) ioread32(addr + off)
+# define LITEX_WRITE_REG(val, addr) iowrite32(val, addr)
+# define LITEX_WRITE_REG_OFF(val, addr, off) iowrite32(val, addr + off)
+#else
+# define LITEX_READ_REG(addr) ioread32be(addr)
+# define LITEX_READ_REG_OFF(addr, off) ioread32be(addr + off)
+# define LITEX_WRITE_REG(val, addr) iowrite32be(val, addr)
+# define LITEX_WRITE_REG_OFF(val, addr, off) iowrite32be(val, addr + off)
+#endif
+
+/* Helper functions for manipulating LiteX registers */
+
+static inline void litex_set_reg(void __iomem *reg, u32 reg_size, u32 val)
+{
+ u32 shifted_data, shift, i;
+
+ for (i = 0; i < reg_size; ++i) {
+ shift = ((reg_size - i - 1) * LITEX_SUBREG_SIZE_BIT);
+ shifted_data = val >> shift;
+ LITEX_WRITE_REG(shifted_data, reg + (LITEX_REG_SIZE * i));
+ }
+}
+
+static inline u32 litex_get_reg(void __iomem *reg, u32 reg_size)
+{
+ u32 shifted_data, shift, i;
+ u32 result = 0;
+
+ for (i = 0; i < reg_size; ++i) {
+ shifted_data = LITEX_READ_REG(reg + (LITEX_REG_SIZE * i));
+ shift = ((reg_size - i - 1) * LITEX_SUBREG_SIZE_BIT);
+ result |= (shifted_data << shift);
+ }
+
+ return result;
+}
+
+#endif /* _LINUX_LITEX_H */
--
2.23.0
next prev parent reply other threads:[~2019-10-23 9:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-23 9:46 [PATCH v2 0/4] LiteUART serial driver Mateusz Holenko
2019-10-23 9:46 ` [PATCH v2 1/4] dt-bindings: vendor: add vendor prefix for LiteX Mateusz Holenko
2019-10-25 23:36 ` Rob Herring
2019-10-23 9:47 ` Mateusz Holenko [this message]
2019-10-26 0:03 ` [PATCH v2 2/4] litex: add common LiteX header Rob Herring
2019-11-07 9:27 ` Mateusz Holenko
2019-11-20 17:23 ` Gabriel L. Somlo
2019-11-20 19:26 ` Greg Kroah-Hartman
2019-11-26 9:02 ` Mateusz Holenko
2019-11-26 9:19 ` Greg Kroah-Hartman
2019-11-29 15:39 ` Mateusz Holenko
2019-10-23 9:47 ` [PATCH v2 3/4] dt-bindings: serial: document LiteUART bindings Mateusz Holenko
2019-10-26 0:14 ` Rob Herring
2019-10-23 9:47 ` [PATCH v2 4/4] drivers/tty/serial: add LiteUART driver Mateusz Holenko
2019-10-26 0:13 ` Rob Herring
2019-11-07 9:33 ` Mateusz Holenko
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