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