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author | Sascha Hauer <s.hauer@pengutronix.de> | 2018-07-09 08:21:06 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-07-09 08:21:06 +0200 |
commit | 1073955aa5fb777381de710ad314cdbf68fef189 (patch) | |
tree | 8991e01bd8ed34c6fd74a110b691727eb4382524 /include | |
parent | 47d229d5c0fc626707101f0ad6c653ee68a65616 (diff) | |
parent | 0fd30cd29b5838b048ed59cc018a74d858567f21 (diff) | |
download | barebox-1073955aa5fb777381de710ad314cdbf68fef189.tar.gz barebox-1073955aa5fb777381de710ad314cdbf68fef189.tar.xz |
Merge branch 'for-next/imx8mq'
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/iopoll.h | 75 | ||||
-rw-r--r-- | include/pbl.h | 6 |
2 files changed, 81 insertions, 0 deletions
diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h new file mode 100644 index 0000000000..66c8f652ca --- /dev/null +++ b/include/linux/iopoll.h @@ -0,0 +1,75 @@ +/* + * 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> +#include <pbl.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_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. + * + * We do not have timing functions in the PBL, so ignore the timeout value and + * loop infinitely here. + */ +#define readx_poll_timeout(op, addr, val, cond, timeout_us) \ +({ \ + uint64_t start; \ + if (!IN_PBL && timeout_us) \ + start = get_time_ns(); \ + for (;;) { \ + (val) = op(addr); \ + if (cond) \ + break; \ + if (!IN_PBL && 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 */ diff --git a/include/pbl.h b/include/pbl.h index d041a3fbad..787bd8293f 100644 --- a/include/pbl.h +++ b/include/pbl.h @@ -12,4 +12,10 @@ extern unsigned long free_mem_end_ptr; void pbl_barebox_uncompress(void *dest, void *compressed_start, unsigned int len); +#ifdef __PBL__ +#define IN_PBL 1 +#else +#define IN_PBL 0 +#endif + #endif /* __PBL_H__ */ |