From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pf0-x244.google.com ([2607:f8b0:400e:c00::244]) by casper.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fMg5r-0005xg-Q6 for barebox@lists.infradead.org; Sat, 26 May 2018 20:47:17 +0000 Received: by mail-pf0-x244.google.com with SMTP id j20-v6so4085931pff.10 for ; Sat, 26 May 2018 13:47:08 -0700 (PDT) From: Andrey Smirnov Subject: [PATCH v2 32/48] Port from U-Boot Date: Sat, 26 May 2018 13:44:35 -0700 Message-Id: <20180526204451.16530-33-andrew.smirnov@gmail.com> In-Reply-To: <20180526204451.16530-1-andrew.smirnov@gmail.com> References: <20180526204451.16530-1-andrew.smirnov@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org To: barebox@lists.infradead.org Cc: Andrey Smirnov Signed-off-by: Andrey Smirnov --- 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 +#include +#include + +/** + * 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 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox