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From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Subject: [PATCH v3 31/38] Port <linux/iopoll.h> from U-Boot
Date: Wed,  6 Jun 2018 11:44:24 -0700	[thread overview]
Message-ID: <20180606184431.10348-32-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20180606184431.10348-1-andrew.smirnov@gmail.com>

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 include/linux/iopoll.h | 69 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 include/linux/iopoll.h

diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
new file mode 100644
index 000000000..6e8a6fd71
--- /dev/null
+++ b/include/linux/iopoll.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2012-2014 The Linux Foundation. All rights reserved.
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#ifndef _LINUX_IOPOLL_H
+#define _LINUX_IOPOLL_H
+
+#include <errno.h>
+#include <io.h>
+#include <clock.h>
+
+/**
+ * readx_poll_timeout - Periodically poll an address until a condition is met or a timeout occurs
+ * @op: accessor function (takes @addr as its only argument)
+ * @addr: Address to poll
+ * @val: Variable to read the value into
+ * @cond: Break condition (usually involving @val)
+ * @timeout_ns: Timeout in ns, 0 means never timeout
+ *
+ * Returns 0 on success and -ETIMEDOUT upon a timeout. In either
+ * case, the last read value at @addr is stored in @val.
+ *
+ * When available, you'll probably want to use one of the specialized
+ * macros defined below rather than this macro directly.
+ */
+#define readx_poll_timeout(op, addr, val, cond, timeout_ns)	\
+({ \
+	uint64_t start = get_time_ns(); \
+	for (;;) { \
+		(val) = op(addr); \
+		if (cond) \
+			break; \
+		if (timeout_ns && \
+		    is_timeout(start, (timeout_ns))) {	\
+			(val) = op(addr); \
+			break; \
+		} \
+	} \
+	(cond) ? 0 : -ETIMEDOUT; \
+})
+
+
+#define readb_poll_timeout(addr, val, cond, timeout_us) \
+	readx_poll_timeout(readb, addr, val, cond, timeout_us)
+
+#define readw_poll_timeout(addr, val, cond, timeout_us) \
+	readx_poll_timeout(readw, addr, val, cond, timeout_us)
+
+#define readl_poll_timeout(addr, val, cond, timeout_us) \
+	readx_poll_timeout(readl, addr, val, cond, timeout_us)
+
+#define readq_poll_timeout(addr, val, cond, timeout_us) \
+	readx_poll_timeout(readq, addr, val, cond, timeout_us)
+
+#define readb_relaxed_poll_timeout(addr, val, cond, timeout_us) \
+	readx_poll_timeout(readb_relaxed, addr, val, cond, timeout_us)
+
+#define readw_relaxed_poll_timeout(addr, val, cond, timeout_us) \
+	readx_poll_timeout(readw_relaxed, addr, val, cond, timeout_us)
+
+#define readl_relaxed_poll_timeout(addr, val, cond, timeout_us) \
+	readx_poll_timeout(readl_relaxed, addr, val, cond, timeout_us)
+
+#define readq_relaxed_poll_timeout(addr, val, cond, timeout_us) \
+	readx_poll_timeout(readq_relaxed, addr, val, cond, timeout_us)
+
+#endif /* _LINUX_IOPOLL_H */
-- 
2.17.0


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  parent reply	other threads:[~2018-06-06 18:45 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-06 18:43 [PATCH v3 00/38] ARM: i.MX8MQ and EVK support Andrey Smirnov
2018-06-06 18:43 ` [PATCH v3 01/38] ARM: i.MX: xload: Fix compiler warning Andrey Smirnov
2018-06-06 18:43 ` [PATCH v3 02/38] ARM: i.MX: compile arm32 specific errata only for CPU32 Andrey Smirnov
2018-06-06 18:43 ` [PATCH v3 03/38] ARM: Add i.MX8 support Andrey Smirnov
2018-06-06 18:43 ` [PATCH v3 04/38] aarch64: Add i.MX8 debug UART support Andrey Smirnov
2018-06-06 18:43 ` [PATCH v3 05/38] Include our own include/dt-bindings Andrey Smirnov
2018-06-06 18:43 ` [PATCH v3 06/38] mci: imx-esdhc: use dma mapping functions Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 07/38] net: fec_imx: remove unnecessary DMA sync ops Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 08/38] net: fec_imx: Use dma mapping functions Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 09/38] net: fec_imx: Make use of IS_ALIGNED Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 10/38] clock: Add i.MX8MQ clock driver Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 11/38] serial: i.MX: Add i.MX8 support Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 12/38] mmc: i.MX esdhc: " Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 13/38] gpio: i.MX: Add i.MX8mq support Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 14/38] ARM: i.MX: ocotp: Add i.MX8MQ support Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 15/38] ARM: i.MX: Split shared CCM code into a separate file Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 16/38] ARM: i.MX: Add IOMUX pad constants for i.MX8 Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 17/38] ARM: i.MX: Add basic CCM " Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 18/38] ARM: Add constants and helpers for system counter interface Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 19/38] clocksource: armv8-timer: Convert explicit assembly into helpers Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 20/38] ARM: i.MX8: Initialize system counter Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 21/38] ARM: i.MX: boot: Fix address casting on 64-bit platforms Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 22/38] ARM: boot: Add trivial i.MX8 support Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 23/38] ARM: i.MX: xload-esdhc: Rework to make code be less i.MX6-specific Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 24/38] ARM: i.MX: xload-esdhc: Allow custom buffer address, device offset Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 25/38] ARM: i.MX: xload-esdhc: Add support for i.MX8 Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 26/38] pinctrl: i.MX: " Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 27/38] Documentation: imx: Change block size for 'dd' to 1024 Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 28/38] Documentation: i.MX: Add missing <soctype> Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 29/38] clocksource: armv8-timer: Make armv8_clocksource_read() static Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 30/38] clocksource: armv8-timer: Make use of postcore_platform_driver() Andrey Smirnov
2018-06-06 18:44 ` Andrey Smirnov [this message]
2018-06-06 18:44 ` [PATCH v3 32/38] common/clock: Move delay and timeout functions to clock.h Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 33/38] clock: Use udelay() to implement mdelay() Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 34/38] ARM: i.MX8: Add DDRC PHY and DDR CTL base addresses Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 35/38] Kbuild: Add $(quote) Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 36/38] Add builtin firmware support Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 37/38] ARM: i.MX8: Add DDRC PHY support code Andrey Smirnov
2018-06-06 18:44 ` [PATCH v3 38/38] ARM: Specify HAVE_PBL_IMAGE for CPU_64 Andrey Smirnov
2018-06-07 12:59 ` [PATCH v3 00/38] ARM: i.MX8MQ and EVK support Andrey Smirnov

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