1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
4 *                    <benh@kernel.crashing.org>
5 */
6
7#ifndef _ASM_POWERPC_DCR_MMIO_H
8#define _ASM_POWERPC_DCR_MMIO_H
9#ifdef __KERNEL__
10
11#include <asm/io.h>
12
13typedef struct {
14	void __iomem *token;
15	unsigned int stride;
16	unsigned int base;
17} dcr_host_mmio_t;
18
19static inline bool dcr_map_ok_mmio(dcr_host_mmio_t host)
20{
21	return host.token != NULL;
22}
23
24extern dcr_host_mmio_t dcr_map_mmio(struct device_node *dev,
25				    unsigned int dcr_n,
26				    unsigned int dcr_c);
27extern void dcr_unmap_mmio(dcr_host_mmio_t host, unsigned int dcr_c);
28
29static inline u32 dcr_read_mmio(dcr_host_mmio_t host, unsigned int dcr_n)
30{
31	return in_be32(host.token + ((host.base + dcr_n) * host.stride));
32}
33
34static inline void dcr_write_mmio(dcr_host_mmio_t host,
35				  unsigned int dcr_n,
36				  u32 value)
37{
38	out_be32(host.token + ((host.base + dcr_n) * host.stride), value);
39}
40
41#endif /* __KERNEL__ */
42#endif /* _ASM_POWERPC_DCR_MMIO_H */
43
44
45