1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 4 */ 5 6 #ifndef _ASM_ARC_IO_H 7 #define _ASM_ARC_IO_H 8 9 #include <linux/types.h> 10 #include <asm/byteorder.h> 11 #include <asm/page.h> 12 #include <linux/unaligned.h> 13 14 #ifdef CONFIG_ISA_ARCV2 15 #include <asm/barrier.h> 16 #define __iormb() rmb() 17 #define __iowmb() wmb() 18 #else 19 #define __iormb() do { } while (0) 20 #define __iowmb() do { } while (0) 21 #endif 22 23 extern void __iomem *ioremap(phys_addr_t paddr, unsigned long size); 24 #define ioremap ioremap 25 #define ioremap_prot ioremap_prot 26 #define iounmap iounmap 27 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr) 28 { 29 return (void __iomem *)port; 30 } 31 32 static inline void ioport_unmap(void __iomem *addr) 33 { 34 } 35 36 /* 37 * io{read,write}{16,32}be() macros 38 */ 39 #define ioread16be(p) ({ u16 __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(); __v; }) 40 #define ioread32be(p) ({ u32 __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(); __v; }) 41 42 #define iowrite16be(v,p) ({ __iowmb(); __raw_writew((__force u16)cpu_to_be16(v), p); }) 43 #define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force u32)cpu_to_be32(v), p); }) 44 45 /* Change struct page to physical address */ 46 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 47 48 #define __raw_readb __raw_readb 49 static inline u8 __raw_readb(const volatile void __iomem *addr) 50 { 51 u8 b; 52 53 __asm__ __volatile__( 54 " ldb%U1 %0, %1 \n" 55 : "=r" (b) 56 : "m" (*(volatile u8 __force *)addr) 57 : "memory"); 58 59 return b; 60 } 61 62 #define __raw_readw __raw_readw 63 static inline u16 __raw_readw(const volatile void __iomem *addr) 64 { 65 u16 s; 66 67 __asm__ __volatile__( 68 " ldw%U1 %0, %1 \n" 69 : "=r" (s) 70 : "m" (*(volatile u16 __force *)addr) 71 : "memory"); 72 73 return s; 74 } 75 76 #define __raw_readl __raw_readl 77 static inline u32 __raw_readl(const volatile void __iomem *addr) 78 { 79 u32 w; 80 81 __asm__ __volatile__( 82 " ld%U1 %0, %1 \n" 83 : "=r" (w) 84 : "m" (*(volatile u32 __force *)addr) 85 : "memory"); 86 87 return w; 88 } 89 90 /* 91 * {read,write}s{b,w,l}() repeatedly access the same IO address in 92 * native endianness in 8-, 16-, 32-bit chunks {into,from} memory, 93 * @count times 94 */ 95 #define __raw_readsx(t,f) \ 96 static inline void __raw_reads##f(const volatile void __iomem *addr, \ 97 void *ptr, unsigned int count) \ 98 { \ 99 bool is_aligned = ((unsigned long)ptr % ((t) / 8)) == 0; \ 100 u##t *buf = ptr; \ 101 \ 102 if (!count) \ 103 return; \ 104 \ 105 /* Some ARC CPU's don't support unaligned accesses */ \ 106 if (is_aligned) { \ 107 do { \ 108 u##t x = __raw_read##f(addr); \ 109 *buf++ = x; \ 110 } while (--count); \ 111 } else { \ 112 do { \ 113 u##t x = __raw_read##f(addr); \ 114 put_unaligned(x, buf++); \ 115 } while (--count); \ 116 } \ 117 } 118 119 #define __raw_readsb __raw_readsb 120 __raw_readsx(8, b) 121 #define __raw_readsw __raw_readsw 122 __raw_readsx(16, w) 123 #define __raw_readsl __raw_readsl 124 __raw_readsx(32, l) 125 126 #define __raw_writeb __raw_writeb 127 static inline void __raw_writeb(u8 b, volatile void __iomem *addr) 128 { 129 __asm__ __volatile__( 130 " stb%U1 %0, %1 \n" 131 : 132 : "r" (b), "m" (*(volatile u8 __force *)addr) 133 : "memory"); 134 } 135 136 #define __raw_writew __raw_writew 137 static inline void __raw_writew(u16 s, volatile void __iomem *addr) 138 { 139 __asm__ __volatile__( 140 " stw%U1 %0, %1 \n" 141 : 142 : "r" (s), "m" (*(volatile u16 __force *)addr) 143 : "memory"); 144 145 } 146 147 #define __raw_writel __raw_writel 148 static inline void __raw_writel(u32 w, volatile void __iomem *addr) 149 { 150 __asm__ __volatile__( 151 " st%U1 %0, %1 \n" 152 : 153 : "r" (w), "m" (*(volatile u32 __force *)addr) 154 : "memory"); 155 156 } 157 158 #define __raw_writesx(t,f) \ 159 static inline void __raw_writes##f(volatile void __iomem *addr, \ 160 const void *ptr, unsigned int count) \ 161 { \ 162 bool is_aligned = ((unsigned long)ptr % ((t) / 8)) == 0; \ 163 const u##t *buf = ptr; \ 164 \ 165 if (!count) \ 166 return; \ 167 \ 168 /* Some ARC CPU's don't support unaligned accesses */ \ 169 if (is_aligned) { \ 170 do { \ 171 __raw_write##f(*buf++, addr); \ 172 } while (--count); \ 173 } else { \ 174 do { \ 175 __raw_write##f(get_unaligned(buf++), addr); \ 176 } while (--count); \ 177 } \ 178 } 179 180 #define __raw_writesb __raw_writesb 181 __raw_writesx(8, b) 182 #define __raw_writesw __raw_writesw 183 __raw_writesx(16, w) 184 #define __raw_writesl __raw_writesl 185 __raw_writesx(32, l) 186 187 /* 188 * MMIO can also get buffered/optimized in micro-arch, so barriers needed 189 * Based on ARM model for the typical use case 190 * 191 * <ST [DMA buffer]> 192 * <writel MMIO "go" reg> 193 * or: 194 * <readl MMIO "status" reg> 195 * <LD [DMA buffer]> 196 * 197 * http://lkml.kernel.org/r/20150622133656.GG1583@arm.com 198 */ 199 #define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; }) 200 #define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; }) 201 #define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; }) 202 #define readsb(p,d,l) ({ __raw_readsb(p,d,l); __iormb(); }) 203 #define readsw(p,d,l) ({ __raw_readsw(p,d,l); __iormb(); }) 204 #define readsl(p,d,l) ({ __raw_readsl(p,d,l); __iormb(); }) 205 206 #define writeb(v,c) ({ __iowmb(); writeb_relaxed(v,c); }) 207 #define writew(v,c) ({ __iowmb(); writew_relaxed(v,c); }) 208 #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) 209 #define writesb(p,d,l) ({ __iowmb(); __raw_writesb(p,d,l); }) 210 #define writesw(p,d,l) ({ __iowmb(); __raw_writesw(p,d,l); }) 211 #define writesl(p,d,l) ({ __iowmb(); __raw_writesl(p,d,l); }) 212 213 /* 214 * Relaxed API for drivers which can handle barrier ordering themselves 215 * 216 * Also these are defined to perform little endian accesses. 217 * To provide the typical device register semantics of fixed endian, 218 * swap the byte order for Big Endian 219 * 220 * http://lkml.kernel.org/r/201603100845.30602.arnd@arndb.de 221 */ 222 #define readb_relaxed(c) __raw_readb(c) 223 #define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16) \ 224 __raw_readw(c)); __r; }) 225 #define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \ 226 __raw_readl(c)); __r; }) 227 228 #define writeb_relaxed(v,c) __raw_writeb(v,c) 229 #define writew_relaxed(v,c) __raw_writew((__force u16) cpu_to_le16(v),c) 230 #define writel_relaxed(v,c) __raw_writel((__force u32) cpu_to_le32(v),c) 231 232 #include <asm-generic/io.h> 233 234 #endif /* _ASM_ARC_IO_H */ 235