1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_EARLY_IOREMAP_H_
3 #define _ASM_EARLY_IOREMAP_H_
4
5 #include <linux/types.h>
6
7 /*
8 * early_ioremap() and early_iounmap() are for temporary early boot-time
9 * mappings, before the real ioremap() is functional.
10 */
11 extern void __iomem *early_ioremap(resource_size_t phys_addr,
12 unsigned long size);
13 extern void *early_memremap(resource_size_t phys_addr,
14 unsigned long size);
15 extern void *early_memremap_ro(resource_size_t phys_addr,
16 unsigned long size);
17 extern void *early_memremap_prot(resource_size_t phys_addr,
18 unsigned long size, unsigned long prot_val);
19 extern void early_iounmap(void __iomem *addr, unsigned long size);
20 extern void early_memunmap(void *addr, unsigned long size);
21
22 #if defined(CONFIG_GENERIC_EARLY_IOREMAP) && defined(CONFIG_MMU)
23 /* Arch-specific initialization */
24 extern void early_ioremap_init(void);
25
26 /* Generic initialization called by architecture code */
27 extern void early_ioremap_setup(void);
28
29 /*
30 * Called as last step in paging_init() so library can act
31 * accordingly for subsequent map/unmap requests.
32 */
33 extern void early_ioremap_reset(void);
34
35 /*
36 * Early copy from unmapped memory to kernel mapped memory.
37 */
38 extern void copy_from_early_mem(void *dest, phys_addr_t src,
39 unsigned long size);
40
41 #else
early_ioremap_init(void)42 static inline void early_ioremap_init(void) { }
early_ioremap_setup(void)43 static inline void early_ioremap_setup(void) { }
early_ioremap_reset(void)44 static inline void early_ioremap_reset(void) { }
45 #endif
46
47 #endif /* _ASM_EARLY_IOREMAP_H_ */
48