[RFC PATCH v3 14/24] tests/qtest: add register access macros and functions

[Octavian Purdila]

Add utility macros for accessing register or register bit fields in
tests, e.g.:

  REG32_WRITE(FLEXCOMM, PSELID, persel);
  g_assert(REG32_READ_FIELD(FLEXCOMM, PSELID, PERSEL) == persel);

Signed-off-by: Octavian Purdila <tavip@google.com>
---
 tests/qtest/reg-utils.h | 70 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 tests/qtest/reg-utils.h

diff --git a/tests/qtest/reg-utils.h b/tests/qtest/reg-utils.h
new file mode 100644
index 0000000000..e09aaf3333
--- /dev/null
+++ b/tests/qtest/reg-utils.h
@@ -0,0 +1,70 @@
+/*
+ * Register access utilities for device tests.
+ *
+ * Copyright (C) 2024 Google LLC
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#ifndef _REG_UTILS_H
+#define _REG_UTILS_H
+
+#include "libqtest-single.h"
+#include "hw/registerfields.h"
+
+#ifdef DEBUG_REG
+#define debug(fmt, args...) fprintf(stderr, fmt, ## args)
+#else
+#define debug(fmt, args...)
+#endif
+
+#define _REG_OFF(mod, reg) (A_##mod##_##reg)
+
+#define REG32_READ(mod, reg)                                            \
+    ({                                                                  \
+        uint32_t value;                                                 \
+        value = readl(mod##_BASE + _REG_OFF(mod, reg));                 \
+        debug("[%s] -> %08x\n", #reg, value);                           \
+        value;                                                          \
+    })
+
+#define REG32_WRITE(mod, reg, value)                                    \
+    do {                                                                \
+        debug("[%s] <- %08x\n", #reg, value);                           \
+        writel(mod##_BASE + _REG_OFF(mod, reg), value);                 \
+    } while (0)
+
+#define REG_FIELD_VAL(v, mod, reg, field)                               \
+    FIELD_EX32(v, mod##_##reg, field)                                   \
+
+#define REG32_READ_FIELD(mod, reg, field)                   \
+    REG_FIELD_VAL(REG32_READ(mod, reg), mod, reg, field)
+
+#define REG32_WRITE_FIELD(mod, reg, field, val)                         \
+    do {                                                                \
+        uint32_t _tmp = REG32_READ(mod, reg);                           \
+        _tmp = FIELD_DP32(_tmp, mod##_##reg, field, val);               \
+        REG32_WRITE(mod, reg, _tmp);                                    \
+    } while (0)
+
+#define REG32_WRITE_FIELD_NOUPDATE(mod, reg, field, val)                \
+    do {                                                                \
+        uint32_t _tmp = FIELD_DP32(0, mod##_##reg, field, val);         \
+        REG32_WRITE(mod, reg, _tmp);                                    \
+    } while (0)
+
+#define WAIT_REG32_FIELD(ns, mod, reg, field, val)                      \
+    do {                                                                \
+        clock_step(ns);                                                 \
+        g_assert_cmpuint(REG32_READ_FIELD(mod, reg, field), ==, val);   \
+    } while (0)
+
+#define REG32_READ_FAIL(mod, reg) \
+    readl_fail(mod##_BASE + _REG_OFF(mod, reg))
+
+#define REG32_WRITE_FAIL(mod, reg, value) \
+    writel_fail(mod##_BASE + _REG_OFF(mod, reg), value)
+
+#endif /* _REG_UTILS_H */
-- 
2.46.0.295.g3b9ea8a38a-goog