include/asm/dcr-mmio.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
0004  *                    <benh@kernel.crashing.org>
0005  */
0006
0007 #ifndef _ASM_POWERPC_DCR_MMIO_H
0008 #define _ASM_POWERPC_DCR_MMIO_H
0009 #ifdef __KERNEL__
0010
0011 #include <asm/io.h>
0012
0013 typedef struct {
0014     void __iomem *token;
0015     unsigned int stride;
0016     unsigned int base;
0017 } dcr_host_mmio_t;
0018
0019 static inline bool dcr_map_ok_mmio(dcr_host_mmio_t host)
0020 {
0021     return host.token != NULL;
0022 }
0023
0024 extern dcr_host_mmio_t dcr_map_mmio(struct device_node *dev,
0025                     unsigned int dcr_n,
0026                     unsigned int dcr_c);
0027 extern void dcr_unmap_mmio(dcr_host_mmio_t host, unsigned int dcr_c);
0028
0029 static inline u32 dcr_read_mmio(dcr_host_mmio_t host, unsigned int dcr_n)
0030 {
0031     return in_be32(host.token + ((host.base + dcr_n) * host.stride));
0032 }
0033
0034 static inline void dcr_write_mmio(dcr_host_mmio_t host,
0035                   unsigned int dcr_n,
0036                   u32 value)
0037 {
0038     out_be32(host.token + ((host.base + dcr_n) * host.stride), value);
0039 }
0040
0041 #endif /* __KERNEL__ */
0042 #endif /* _ASM_POWERPC_DCR_MMIO_H */
0043
0044