arch/arc/include/asm/io.h

   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 <asm/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 extern void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
  25                                   unsigned long flags);
  26 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
  27 {
  28         return (void __iomem *)port;
  29 }
  30
  31 static inline void ioport_unmap(void __iomem *addr)
  32 {
  33 }
  34
  35 extern void iounmap(const void __iomem *addr);
  36
  37 #define ioremap_nocache(phy, sz)        ioremap(phy, sz)
  38 #define ioremap_wc(phy, sz)             ioremap(phy, sz)
  39 #define ioremap_wt(phy, sz)             ioremap(phy, sz)
  40
  41 /*
  42  * io{read,write}{16,32}be() macros
  43  */
  44 #define ioread16be(p)           ({ u16 __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(); __v; })
  45 #define ioread32be(p)           ({ u32 __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(); __v; })
  46
  47 #define iowrite16be(v,p)        ({ __iowmb(); __raw_writew((__force u16)cpu_to_be16(v), p); })
  48 #define iowrite32be(v,p)        ({ __iowmb(); __raw_writel((__force u32)cpu_to_be32(v), p); })
  49
  50 /* Change struct page to physical address */
  51 #define page_to_phys(page)              (page_to_pfn(page) << PAGE_SHIFT)
  52
  53 #define __raw_readb __raw_readb
  54 static inline u8 __raw_readb(const volatile void __iomem *addr)
  55 {
  56         u8 b;
  57
  58         __asm__ __volatile__(
  59         "       ldb%U1 %0, %1   \n"
  60         : "=r" (b)
  61         : "m" (*(volatile u8 __force *)addr)
  62         : "memory");
  63
  64         return b;
  65 }
  66
  67 #define __raw_readw __raw_readw
  68 static inline u16 __raw_readw(const volatile void __iomem *addr)
  69 {
  70         u16 s;
  71
  72         __asm__ __volatile__(
  73         "       ldw%U1 %0, %1   \n"
  74         : "=r" (s)
  75         : "m" (*(volatile u16 __force *)addr)
  76         : "memory");
  77
  78         return s;
  79 }
  80
  81 #define __raw_readl __raw_readl
  82 static inline u32 __raw_readl(const volatile void __iomem *addr)
  83 {
  84         u32 w;
  85
  86         __asm__ __volatile__(
  87         "       ld%U1 %0, %1    \n"
  88         : "=r" (w)
  89         : "m" (*(volatile u32 __force *)addr)
  90         : "memory");
  91
  92         return w;
  93 }
  94
  95 /*
  96  * {read,write}s{b,w,l}() repeatedly access the same IO address in
  97  * native endianness in 8-, 16-, 32-bit chunks {into,from} memory,
  98  * @count times
  99  */
 100 #define __raw_readsx(t,f) \
 101 static inline void __raw_reads##f(const volatile void __iomem *addr,    \
 102                                   void *ptr, unsigned int count)        \
 103 {                                                                       \
 104         bool is_aligned = ((unsigned long)ptr % ((t) / 8)) == 0;        \
 105         u##t *buf = ptr;                                                \
 106                                                                         \
 107         if (!count)                                                     \
 108                 return;                                                 \
 109                                                                         \
 110         /* Some ARC CPU's don't support unaligned accesses */           \
 111         if (is_aligned) {                                               \
 112                 do {                                                    \
 113                         u##t x = __raw_read##f(addr);                   \
 114                         *buf++ = x;                                     \
 115                 } while (--count);                                      \
 116         } else {                                                        \
 117                 do {                                                    \
 118                         u##t x = __raw_read##f(addr);                   \
 119                         put_unaligned(x, buf++);                        \
 120                 } while (--count);                                      \
 121         }                                                               \
 122 }
 123
 124 #define __raw_readsb __raw_readsb
 125 __raw_readsx(8, b)
 126 #define __raw_readsw __raw_readsw
 127 __raw_readsx(16, w)
 128 #define __raw_readsl __raw_readsl
 129 __raw_readsx(32, l)
 130
 131 #define __raw_writeb __raw_writeb
 132 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
 133 {
 134         __asm__ __volatile__(
 135         "       stb%U1 %0, %1   \n"
 136         :
 137         : "r" (b), "m" (*(volatile u8 __force *)addr)
 138         : "memory");
 139 }
 140
 141 #define __raw_writew __raw_writew
 142 static inline void __raw_writew(u16 s, volatile void __iomem *addr)
 143 {
 144         __asm__ __volatile__(
 145         "       stw%U1 %0, %1   \n"
 146         :
 147         : "r" (s), "m" (*(volatile u16 __force *)addr)
 148         : "memory");
 149
 150 }
 151
 152 #define __raw_writel __raw_writel
 153 static inline void __raw_writel(u32 w, volatile void __iomem *addr)
 154 {
 155         __asm__ __volatile__(
 156         "       st%U1 %0, %1    \n"
 157         :
 158         : "r" (w), "m" (*(volatile u32 __force *)addr)
 159         : "memory");
 160
 161 }
 162
 163 #define __raw_writesx(t,f)                                              \
 164 static inline void __raw_writes##f(volatile void __iomem *addr,         \
 165                                    const void *ptr, unsigned int count) \
 166 {                                                                       \
 167         bool is_aligned = ((unsigned long)ptr % ((t) / 8)) == 0;        \
 168         const u##t *buf = ptr;                                          \
 169                                                                         \
 170         if (!count)                                                     \
 171                 return;                                                 \
 172                                                                         \
 173         /* Some ARC CPU's don't support unaligned accesses */           \
 174         if (is_aligned) {                                               \
 175                 do {                                                    \
 176                         __raw_write##f(*buf++, addr);                   \
 177                 } while (--count);                                      \
 178         } else {                                                        \
 179                 do {                                                    \
 180                         __raw_write##f(get_unaligned(buf++), addr);     \
 181                 } while (--count);                                      \
 182         }                                                               \
 183 }
 184
 185 #define __raw_writesb __raw_writesb
 186 __raw_writesx(8, b)
 187 #define __raw_writesw __raw_writesw
 188 __raw_writesx(16, w)
 189 #define __raw_writesl __raw_writesl
 190 __raw_writesx(32, l)
 191
 192 /*
 193  * MMIO can also get buffered/optimized in micro-arch, so barriers needed
 194  * Based on ARM model for the typical use case
 195  *
 196  *      <ST [DMA buffer]>
 197  *      <writel MMIO "go" reg>
 198  *  or:
 199  *      <readl MMIO "status" reg>
 200  *      <LD [DMA buffer]>
 201  *
 202  * http://lkml.kernel.org/r/20150622133656.GG1583@arm.com
 203  */
 204 #define readb(c)                ({ u8  __v = readb_relaxed(c); __iormb(); __v; })
 205 #define readw(c)                ({ u16 __v = readw_relaxed(c); __iormb(); __v; })
 206 #define readl(c)                ({ u32 __v = readl_relaxed(c); __iormb(); __v; })
 207 #define readsb(p,d,l)           ({ __raw_readsb(p,d,l); __iormb(); })
 208 #define readsw(p,d,l)           ({ __raw_readsw(p,d,l); __iormb(); })
 209 #define readsl(p,d,l)           ({ __raw_readsl(p,d,l); __iormb(); })
 210
 211 #define writeb(v,c)             ({ __iowmb(); writeb_relaxed(v,c); })
 212 #define writew(v,c)             ({ __iowmb(); writew_relaxed(v,c); })
 213 #define writel(v,c)             ({ __iowmb(); writel_relaxed(v,c); })
 214 #define writesb(p,d,l)          ({ __iowmb(); __raw_writesb(p,d,l); })
 215 #define writesw(p,d,l)          ({ __iowmb(); __raw_writesw(p,d,l); })
 216 #define writesl(p,d,l)          ({ __iowmb(); __raw_writesl(p,d,l); })
 217
 218 /*
 219  * Relaxed API for drivers which can handle barrier ordering themselves
 220  *
 221  * Also these are defined to perform little endian accesses.
 222  * To provide the typical device register semantics of fixed endian,
 223  * swap the byte order for Big Endian
 224  *
 225  * http://lkml.kernel.org/r/201603100845.30602.arnd@arndb.de
 226  */
 227 #define readb_relaxed(c)        __raw_readb(c)
 228 #define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16) \
 229                                         __raw_readw(c)); __r; })
 230 #define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \
 231                                         __raw_readl(c)); __r; })
 232
 233 #define writeb_relaxed(v,c)     __raw_writeb(v,c)
 234 #define writew_relaxed(v,c)     __raw_writew((__force u16) cpu_to_le16(v),c)
 235 #define writel_relaxed(v,c)     __raw_writel((__force u32) cpu_to_le32(v),c)
 236
 237 #include <asm-generic/io.h>
 238
 239 #endif /* _ASM_ARC_IO_H */