[PATCH 16/20] e1000: Add functions for register polling

[Andrey Smirnov]

Signed-off-by: Andrey Smirnov <andrew.smirnov at gmail.com>
---
 drivers/net/e1000/e1000.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index 291e64d..5e24758 100644
--- a/drivers/net/e1000/e1000.h
+++ b/drivers/net/e1000/e1000.h
@@ -2176,5 +2176,24 @@ static inline uint32_t e1000_read_reg(struct e1000_hw *hw, uint32_t reg)
 }


+static inline int e1000_poll_reg(struct e1000_hw *hw, uint32_t reg,
+				 uint32_t mask, uint32_t value,
+				 uint64_t timeout)
+{
+	const uint64_t start = get_time_ns();
+
+	do {
+		const uint32_t v = e1000_read_reg(hw, reg);
+
+		if ((v & mask) == value)
+			return 0;
+
+	} while (!is_timeout(start, timeout));
+
+	return -ETIMEDOUT;
+}
+
+#define E1000_POLL_REG(a, reg, mask, value, timeout)	\
+	e1000_poll_reg((a), E1000_##reg, (mask), (value), (timeout))

 #endif	/* _E1000_HW_H_ */
--
2.5.0