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88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Wait for bit with timeout and ctrlc
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*
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* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
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*/
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#ifndef __WAIT_BIT_H
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#define __WAIT_BIT_H
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#include <console.h>
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#include <log.h>
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#include <time.h>
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#include <watchdog.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <asm/io.h>
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/**
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* wait_for_bit_x() waits for bit set/cleared in register
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*
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* Function polls register waiting for specific bit(s) change
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* (either 0->1 or 1->0). It can fail under two conditions:
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* - Timeout
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* - User interaction (CTRL-C)
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* Function succeeds only if all bits of masked register are set/cleared
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* (depending on set option).
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*
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* @param reg Register that will be read (using read_x())
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* @param mask Bit(s) of register that must be active
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* @param set Selects wait condition (bit set or clear)
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* @param timeout_ms Timeout (in milliseconds)
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* @param breakable Enables CTRL-C interruption
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* @return 0 on success, -ETIMEDOUT or -EINTR on failure
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*/
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#define BUILD_WAIT_FOR_BIT(sfx, type, read) \
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\
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static inline int wait_for_bit_##sfx(const void *reg, \
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const type mask, \
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const bool set, \
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const unsigned int timeout_ms, \
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const bool breakable) \
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{ \
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type val; \
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unsigned long start = get_timer(0); \
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\
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while (1) { \
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val = read(reg); \
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\
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if (!set) \
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val = ~val; \
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\
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if ((val & mask) == mask) \
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return 0; \
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\
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if (get_timer(start) > timeout_ms) \
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break; \
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\
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if (breakable && ctrlc()) { \
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puts("Abort\n"); \
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return -EINTR; \
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} \
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\
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udelay(1); \
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WATCHDOG_RESET(); \
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} \
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\
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debug("%s: Timeout (reg=%p mask=%x wait_set=%i)\n", __func__, \
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reg, mask, set); \
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\
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return -ETIMEDOUT; \
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}
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BUILD_WAIT_FOR_BIT(8, u8, readb)
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BUILD_WAIT_FOR_BIT(le16, u16, readw)
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BUILD_WAIT_FOR_BIT(16, u16, readw)
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#ifdef readw_be
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BUILD_WAIT_FOR_BIT(be16, u16, readw_be)
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#endif
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BUILD_WAIT_FOR_BIT(le32, u32, readl)
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BUILD_WAIT_FOR_BIT(32, u32, readl)
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#ifdef readl_be
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BUILD_WAIT_FOR_BIT(be32, u32, readl_be)
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#endif
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#endif
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