1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _ASM_EARLY_IOREMAP_H_
3*4882a593Smuzhiyun #define _ASM_EARLY_IOREMAP_H_
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/types.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun /*
8*4882a593Smuzhiyun * early_ioremap() and early_iounmap() are for temporary early boot-time
9*4882a593Smuzhiyun * mappings, before the real ioremap() is functional.
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun extern void __iomem *early_ioremap(resource_size_t phys_addr,
12*4882a593Smuzhiyun unsigned long size);
13*4882a593Smuzhiyun extern void *early_memremap(resource_size_t phys_addr,
14*4882a593Smuzhiyun unsigned long size);
15*4882a593Smuzhiyun extern void *early_memremap_ro(resource_size_t phys_addr,
16*4882a593Smuzhiyun unsigned long size);
17*4882a593Smuzhiyun extern void *early_memremap_prot(resource_size_t phys_addr,
18*4882a593Smuzhiyun unsigned long size, unsigned long prot_val);
19*4882a593Smuzhiyun extern void early_iounmap(void __iomem *addr, unsigned long size);
20*4882a593Smuzhiyun extern void early_memunmap(void *addr, unsigned long size);
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /*
23*4882a593Smuzhiyun * Weak function called by early_ioremap_reset(). It does nothing, but
24*4882a593Smuzhiyun * architectures may provide their own version to do any needed cleanups.
25*4882a593Smuzhiyun */
26*4882a593Smuzhiyun extern void early_ioremap_shutdown(void);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun #if defined(CONFIG_GENERIC_EARLY_IOREMAP) && defined(CONFIG_MMU)
29*4882a593Smuzhiyun /* Arch-specific initialization */
30*4882a593Smuzhiyun extern void early_ioremap_init(void);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun /* Generic initialization called by architecture code */
33*4882a593Smuzhiyun extern void early_ioremap_setup(void);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun /*
36*4882a593Smuzhiyun * Called as last step in paging_init() so library can act
37*4882a593Smuzhiyun * accordingly for subsequent map/unmap requests.
38*4882a593Smuzhiyun */
39*4882a593Smuzhiyun extern void early_ioremap_reset(void);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun /*
42*4882a593Smuzhiyun * Early copy from unmapped memory to kernel mapped memory.
43*4882a593Smuzhiyun */
44*4882a593Smuzhiyun extern void copy_from_early_mem(void *dest, phys_addr_t src,
45*4882a593Smuzhiyun unsigned long size);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun #else
early_ioremap_init(void)48*4882a593Smuzhiyun static inline void early_ioremap_init(void) { }
early_ioremap_setup(void)49*4882a593Smuzhiyun static inline void early_ioremap_setup(void) { }
early_ioremap_reset(void)50*4882a593Smuzhiyun static inline void early_ioremap_reset(void) { }
51*4882a593Smuzhiyun #endif
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun #endif /* _ASM_EARLY_IOREMAP_H_ */
54