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 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 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