first commit for chrg

2025-08-16 22:58:22 +08:00
commit 52a3ed5862
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+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-05-06     Jesven       first version
+ */
+#ifndef  __IOREMAP_H__
+#define  __IOREMAP_H__
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * IOREMAP family
+ * `rt_ioremap` default to map physical memory in MMIO region as DEVICE memory
+ * to kernel space. And there are 3 variants currently supported.
+ *
+ * name               | attribution
+ * ------------------ | -----------
+ * rt_ioremap_nocache | Device (MMU_MAP_K_DEVICE)
+ * rt_ioremap_cache   | Normal memory (MMU_MAP_K_RWCB)
+ * rt_ioremap_wt      | Normal memory but guarantee that
+ *                    | Each write access should go to system memory directly
+ *                    | Currently as non-cacheable
+ */
+
+void *rt_ioremap_early(void *paddr, size_t size);
+void *rt_ioremap(void *paddr, size_t size);
+void *rt_ioremap_nocache(void *paddr, size_t size);
+void *rt_ioremap_cached(void *paddr, size_t size);
+void *rt_ioremap_wt(void *paddr, size_t size);
+void rt_iounmap(volatile void *addr);
+
+extern void *rt_ioremap_start;
+extern size_t rt_ioremap_size;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /*__LWP_IOREMAP_H__*/