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git.ipfire.org Git - people/ms/u-boot.git/blob - include/wait_bit.h
2 * Wait for bit with timeout and ctrlc
4 * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
6 * SPDX-License-Identifier: GPL-2.0+
15 #include <linux/errno.h>
19 * wait_for_bit_x() waits for bit set/cleared in register
21 * Function polls register waiting for specific bit(s) change
22 * (either 0->1 or 1->0). It can fail under two conditions:
24 * - User interaction (CTRL-C)
25 * Function succeeds only if all bits of masked register are set/cleared
26 * (depending on set option).
28 * @param reg Register that will be read (using read_x())
29 * @param mask Bit(s) of register that must be active
30 * @param set Selects wait condition (bit set or clear)
31 * @param timeout_ms Timeout (in milliseconds)
32 * @param breakable Enables CTRL-C interruption
33 * @return 0 on success, -ETIMEDOUT or -EINTR on failure
36 #define BUILD_WAIT_FOR_BIT(sfx, type, read) \
38 static inline int wait_for_bit_##sfx(const void *reg, \
41 const unsigned int timeout_ms, \
42 const bool breakable) \
45 unsigned long start = get_timer(0); \
53 if ((val & mask) == mask) \
56 if (get_timer(start) > timeout_ms) \
59 if (breakable && ctrlc()) { \
68 debug("%s: Timeout (reg=%p mask=%x wait_set=%i)\n", __func__, \
74 BUILD_WAIT_FOR_BIT(8, u8
, readb
)
75 BUILD_WAIT_FOR_BIT(le16
, u16
, readw
)
77 BUILD_WAIT_FOR_BIT(be16
, u16
, readw_be
)
79 BUILD_WAIT_FOR_BIT(le32
, u32
, readl
)
81 BUILD_WAIT_FOR_BIT(be32
, u32
, readl_be
)