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authorÁlvaro Fernández Rojas <noltari@gmail.com>2018-01-23 17:14:54 +0100
committerJagan Teki <jagan@amarulasolutions.com>2018-01-24 12:03:43 +0530
commit91fe458bbfcd6485b9413cf398bbfeb6947861ec (patch)
treed8d35f8967bbf7d1b0fe0e01a03069cbdeed3999
parent32466c445c49b489b09f99b4ae9b440d76d4720f (diff)
wait_bit: add 8/16/32 BE/LE versions of wait_for_bit
Add 8/16/32 bits and BE/LE versions of wait_for_bit. This is needed for reading registers that are not aligned to 32 bits, and for Big Endian platforms. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Reviewed-by: Jagan Teki <jagan@openedev.com>
-rw-r--r--include/wait_bit.h65
1 files changed, 65 insertions, 0 deletions
diff --git a/include/wait_bit.h b/include/wait_bit.h
index 06ad43a122..e8acfa5776 100644
--- a/include/wait_bit.h
+++ b/include/wait_bit.h
@@ -69,5 +69,70 @@ static inline int wait_for_bit(const char *prefix, const u32 *reg,
return -ETIMEDOUT;
}
+/**
+ * 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)
+#ifdef readw_be
+BUILD_WAIT_FOR_BIT(be16, u16, readw_be)
+#endif
+BUILD_WAIT_FOR_BIT(le32, u32, readl)
+#ifdef readl_be
+BUILD_WAIT_FOR_BIT(be32, u32, readl_be)
+#endif
#endif