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 bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fTffC-0004Uq-Dy for barebox@lists.infradead.org; Fri, 15 Jun 2018 03:44:42 +0000 Received: by mail-pf0-x244.google.com with SMTP id b74-v6so4220244pfl.5 for ; Thu, 14 Jun 2018 20:44:28 -0700 (PDT) From: Andrey Smirnov Date: Thu, 14 Jun 2018 20:44:01 -0700 Message-Id: <20180615034409.22180-3-andrew.smirnov@gmail.com> In-Reply-To: <20180615034409.22180-1-andrew.smirnov@gmail.com> References: <20180615034409.22180-1-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 Subject: [PATCH v7 02/10] Port from U-Boot To: barebox@lists.infradead.org Cc: Andrey Smirnov Signed-off-by: Andrey Smirnov --- include/clock.h | 14 +++++++++ include/linux/iopoll.h | 69 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 83 insertions(+) create mode 100644 include/linux/iopoll.h diff --git a/include/clock.h b/include/clock.h index 5f2f53ab6..58d84b912 100644 --- a/include/clock.h +++ b/include/clock.h @@ -25,13 +25,27 @@ static inline uint32_t cyc2ns(struct clocksource *cs, uint64_t cycles) int init_clock(struct clocksource *); +#ifndef __PBL__ uint64_t get_time_ns(void); +#else +static inline uint64_t get_time_ns(void) +{ + return 0; +} +#endif void clocks_calc_mult_shift(uint32_t *mult, uint32_t *shift, uint32_t from, uint32_t to, uint32_t maxsec); uint32_t clocksource_hz2mult(uint32_t hz, uint32_t shift_constant); +#ifndef __PBL__ int is_timeout(uint64_t start_ns, uint64_t time_offset_ns); +#else +static inline int is_timeout(uint64_t start_ns, uint64_t time_offset_ns) +{ + return 0; +} +#endif int is_timeout_non_interruptible(uint64_t start_ns, uint64_t time_offset_ns); void ndelay(unsigned long nsecs); diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h new file mode 100644 index 000000000..0213e5c8d --- /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_us: Timeout in us, 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_us) \ +({ \ + uint64_t start = get_time_ns(); \ + for (;;) { \ + (val) = op(addr); \ + if (cond) \ + break; \ + if (timeout_us && \ + is_timeout(start, ((timeout_us) * USECOND))) { \ + (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