1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2022 Felix Palmen
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27 #ifndef _LINUXKPI_LINUX_IO_64_NONATOMIC_LO_HI_H_
28 #define _LINUXKPI_LINUX_IO_64_NONATOMIC_LO_HI_H_
29
30 #include <linux/io.h>
31
32 static inline uint64_t
lo_hi_readq(const volatile void * addr)33 lo_hi_readq(const volatile void *addr)
34 {
35 const volatile uint32_t *p = addr;
36 uint32_t l, h;
37
38 __io_br();
39 l = le32toh(__raw_readl(p));
40 h = le32toh(__raw_readl(p + 1));
41 __io_ar();
42
43 return (l + ((uint64_t)h << 32));
44 }
45
46 static inline void
lo_hi_writeq(uint64_t v,volatile void * addr)47 lo_hi_writeq(uint64_t v, volatile void *addr)
48 {
49 volatile uint32_t *p = addr;
50
51 __io_bw();
52 __raw_writel(htole32(v), p);
53 __raw_writel(htole32(v >> 32), p + 1);
54 __io_aw();
55 }
56
57 #ifndef readq
58 #define readq(addr) lo_hi_readq(addr)
59 #endif
60
61 #ifndef writeq
62 #define writeq(v, addr) lo_hi_writeq(v, addr)
63 #endif
64
65 #endif /* _LINUXKPI_LINUX_IO_64_NONATOMIC_LO_HI_H_ */
66