From: Wilfred Mallawa <wilfred.mall...@wdc.com>
Changes from V1:
* Instead of needing all field bits to be set
we clear the field if any are set. If the field is
0/clear then no change.
Adds a helper macro that implements the register `w1c`
functionality.
Ex:
uint32_t data = FIELD32_1CLEAR(val, REG, FIELD);
If ANY bits of the specified `FIELD` is set
then the respective field is cleared and returned to `data`.
If the field is cleared (0), then no change and
val is returned.
Signed-off-by: Wilfred Mallawa <wilfred.mall...@wdc.com>
---
include/hw/registerfields.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/include/hw/registerfields.h b/include/hw/registerfields.h
index 1330ca77de..4a6a228339 100644
--- a/include/hw/registerfields.h
+++ b/include/hw/registerfields.h
@@ -115,6 +115,28 @@
R_ ## reg ## _ ## field ## _LENGTH, _v.v); \
_d; })
+/*
+ * Clear the specified field in reg_val if
+ * any field bits are set, else no changes made. Implements
+ * single/multi-bit `w1c`
+ *
+ */
+#define FIELD8_1CLEAR(reg_val, reg, field) \
+ (FIELD_EX8(reg_val, reg, field) ? \
+ FIELD_DP8(reg_val, reg, field, 0x00) : reg_val)
+
+#define FIELD16_1CLEAR(reg_val, reg, field) \
+ (FIELD_EX16(reg_val, reg, field) ? \
+ FIELD_DP16(reg_val, reg, field, 0x00) : reg_val)
+
+#define FIELD32_1CLEAR(reg_val, reg, field) \
+ (FIELD_EX32(reg_val, reg, field) ? \
+ FIELD_DP32(reg_val, reg, field, 0x00) : reg_val)
+
+#define FIELD64_1CLEAR(reg_val, reg, field) \
+ (FIELD_EX64(reg_val, reg, field) ? \
+ FIELD_DP64(reg_val, reg, field, 0x00) : reg_val)
+
#define FIELD_SDP8(storage, reg, field, val) ({ \
struct { \
signed int v:R_ ## reg ## _ ## field ## _LENGTH; \
--
2.37.3
