arch/tile/include/asm/io.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_IO_H
  16 #define _ASM_TILE_IO_H
  17
  18 #include <linux/kernel.h>
  19 #include <linux/bug.h>
  20 #include <asm/page.h>
  21
  22 #define IO_SPACE_LIMIT 0xfffffffful
  23
  24 /*
  25  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  26  * access.
  27  */
  28 #define xlate_dev_mem_ptr(p)    __va(p)
  29
  30 /*
  31  * Convert a virtual cached pointer to an uncached pointer.
  32  */
  33 #define xlate_dev_kmem_ptr(p)   p
  34
  35 /*
  36  * Change "struct page" to physical address.
  37  */
  38 #define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
  39
  40 /*
  41  * Some places try to pass in an loff_t for PHYSADDR (?!), so we cast it to
  42  * long before casting it to a pointer to avoid compiler warnings.
  43  */
  44 #if CHIP_HAS_MMIO()
  45 extern void __iomem *ioremap(resource_size_t offset, unsigned long size);
  46 extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size,
  47         pgprot_t pgprot);
  48 extern void iounmap(volatile void __iomem *addr);
  49 #else
  50 #define ioremap(physaddr, size) ((void __iomem *)(unsigned long)(physaddr))
  51 #define iounmap(addr)           ((void)0)
  52 #endif
  53
  54 #define ioremap_nocache(physaddr, size)         ioremap(physaddr, size)
  55 #define ioremap_writethrough(physaddr, size)    ioremap(physaddr, size)
  56 #define ioremap_fullcache(physaddr, size)       ioremap(physaddr, size)
  57
  58 #define mmiowb()
  59
  60 /* Conversion between virtual and physical mappings.  */
  61 #define mm_ptov(addr)           ((void *)phys_to_virt(addr))
  62 #define mm_vtop(addr)           ((unsigned long)virt_to_phys(addr))
  63
  64 #ifdef CONFIG_PCI
  65
  66 extern u8 _tile_readb(unsigned long addr);
  67 extern u16 _tile_readw(unsigned long addr);
  68 extern u32 _tile_readl(unsigned long addr);
  69 extern u64 _tile_readq(unsigned long addr);
  70 extern void _tile_writeb(u8  val, unsigned long addr);
  71 extern void _tile_writew(u16 val, unsigned long addr);
  72 extern void _tile_writel(u32 val, unsigned long addr);
  73 extern void _tile_writeq(u64 val, unsigned long addr);
  74
  75 #else
  76
  77 /*
  78  * The Tile architecture does not support IOMEM unless PCI is enabled.
  79  * Unfortunately we can't yet simply not declare these methods,
  80  * since some generic code that compiles into the kernel, but
  81  * we never run, uses them unconditionally.
  82  */
  83
  84 static inline int iomem_panic(void)
  85 {
  86         panic("readb/writeb and friends do not exist on tile without PCI");
  87         return 0;
  88 }
  89
  90 static inline u8 _tile_readb(unsigned long addr)
  91 {
  92         return iomem_panic();
  93 }
  94
  95 static inline u16 _tile_readw(unsigned long addr)
  96 {
  97         return iomem_panic();
  98 }
  99
 100 static inline u32 _tile_readl(unsigned long addr)
 101 {
 102         return iomem_panic();
 103 }
 104
 105 static inline u64 _tile_readq(unsigned long addr)
 106 {
 107         return iomem_panic();
 108 }
 109
 110 static inline void _tile_writeb(u8  val, unsigned long addr)
 111 {
 112         iomem_panic();
 113 }
 114
 115 static inline void _tile_writew(u16 val, unsigned long addr)
 116 {
 117         iomem_panic();
 118 }
 119
 120 static inline void _tile_writel(u32 val, unsigned long addr)
 121 {
 122         iomem_panic();
 123 }
 124
 125 static inline void _tile_writeq(u64 val, unsigned long addr)
 126 {
 127         iomem_panic();
 128 }
 129
 130 #endif
 131
 132 #define readb(addr) _tile_readb((unsigned long)addr)
 133 #define readw(addr) _tile_readw((unsigned long)addr)
 134 #define readl(addr) _tile_readl((unsigned long)addr)
 135 #define readq(addr) _tile_readq((unsigned long)addr)
 136 #define writeb(val, addr) _tile_writeb(val, (unsigned long)addr)
 137 #define writew(val, addr) _tile_writew(val, (unsigned long)addr)
 138 #define writel(val, addr) _tile_writel(val, (unsigned long)addr)
 139 #define writeq(val, addr) _tile_writeq(val, (unsigned long)addr)
 140
 141 #define __raw_readb readb
 142 #define __raw_readw readw
 143 #define __raw_readl readl
 144 #define __raw_readq readq
 145 #define __raw_writeb writeb
 146 #define __raw_writew writew
 147 #define __raw_writel writel
 148 #define __raw_writeq writeq
 149
 150 #define readb_relaxed readb
 151 #define readw_relaxed readw
 152 #define readl_relaxed readl
 153 #define readq_relaxed readq
 154
 155 #define ioread8 readb
 156 #define ioread16 readw
 157 #define ioread32 readl
 158 #define ioread64 readq
 159 #define iowrite8 writeb
 160 #define iowrite16 writew
 161 #define iowrite32 writel
 162 #define iowrite64 writeq
 163
 164 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src,
 165                                  size_t len)
 166 {
 167         int x;
 168         BUG_ON((unsigned long)src & 0x3);
 169         for (x = 0; x < len; x += 4)
 170                 *(u32 *)(dst + x) = readl(src + x);
 171 }
 172
 173 static inline void memcpy_toio(volatile void __iomem *dst, const void *src,
 174                                 size_t len)
 175 {
 176         int x;
 177         BUG_ON((unsigned long)dst & 0x3);
 178         for (x = 0; x < len; x += 4)
 179                 writel(*(u32 *)(src + x), dst + x);
 180 }
 181
 182 /*
 183  * The Tile architecture does not support IOPORT, even with PCI.
 184  * Unfortunately we can't yet simply not declare these methods,
 185  * since some generic code that compiles into the kernel, but
 186  * we never run, uses them unconditionally.
 187  */
 188
 189 static inline long ioport_panic(void)
 190 {
 191         panic("inb/outb and friends do not exist on tile");
 192         return 0;
 193 }
 194
 195 static inline void __iomem *ioport_map(unsigned long port, unsigned int len)
 196 {
 197         return (void __iomem *) ioport_panic();
 198 }
 199
 200 static inline void ioport_unmap(void __iomem *addr)
 201 {
 202         ioport_panic();
 203 }
 204
 205 static inline u8 inb(unsigned long addr)
 206 {
 207         return ioport_panic();
 208 }
 209
 210 static inline u16 inw(unsigned long addr)
 211 {
 212         return ioport_panic();
 213 }
 214
 215 static inline u32 inl(unsigned long addr)
 216 {
 217         return ioport_panic();
 218 }
 219
 220 static inline void outb(u8 b, unsigned long addr)
 221 {
 222         ioport_panic();
 223 }
 224
 225 static inline void outw(u16 b, unsigned long addr)
 226 {
 227         ioport_panic();
 228 }
 229
 230 static inline void outl(u32 b, unsigned long addr)
 231 {
 232         ioport_panic();
 233 }
 234
 235 #define inb_p(addr)     inb(addr)
 236 #define inw_p(addr)     inw(addr)
 237 #define inl_p(addr)     inl(addr)
 238 #define outb_p(x, addr) outb((x), (addr))
 239 #define outw_p(x, addr) outw((x), (addr))
 240 #define outl_p(x, addr) outl((x), (addr))
 241
 242 static inline void insb(unsigned long addr, void *buffer, int count)
 243 {
 244         ioport_panic();
 245 }
 246
 247 static inline void insw(unsigned long addr, void *buffer, int count)
 248 {
 249         ioport_panic();
 250 }
 251
 252 static inline void insl(unsigned long addr, void *buffer, int count)
 253 {
 254         ioport_panic();
 255 }
 256
 257 static inline void outsb(unsigned long addr, const void *buffer, int count)
 258 {
 259         ioport_panic();
 260 }
 261
 262 static inline void outsw(unsigned long addr, const void *buffer, int count)
 263 {
 264         ioport_panic();
 265 }
 266
 267 static inline void outsl(unsigned long addr, const void *buffer, int count)
 268 {
 269         ioport_panic();
 270 }
 271
 272 #define ioread8_rep(p, dst, count) \
 273         insb((unsigned long) (p), (dst), (count))
 274 #define ioread16_rep(p, dst, count) \
 275         insw((unsigned long) (p), (dst), (count))
 276 #define ioread32_rep(p, dst, count) \
 277         insl((unsigned long) (p), (dst), (count))
 278
 279 #define iowrite8_rep(p, src, count) \
 280         outsb((unsigned long) (p), (src), (count))
 281 #define iowrite16_rep(p, src, count) \
 282         outsw((unsigned long) (p), (src), (count))
 283 #define iowrite32_rep(p, src, count) \
 284         outsl((unsigned long) (p), (src), (count))
 285
 286 #endif /* _ASM_TILE_IO_H */