include/asm-sh64/io.h

   1 #ifndef __ASM_SH64_IO_H
   2 #define __ASM_SH64_IO_H
   3
   4 /*
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * include/asm-sh64/io.h
  10  *
  11  * Copyright (C) 2000, 2001  Paolo Alberelli
  12  * Copyright (C) 2003  Paul Mundt
  13  *
  14  */
  15
  16 /*
  17  * Convention:
  18  *    read{b,w,l}/write{b,w,l} are for PCI,
  19  *    while in{b,w,l}/out{b,w,l} are for ISA
  20  * These may (will) be platform specific function.
  21  *
  22  * In addition, we have
  23  *   ctrl_in{b,w,l}/ctrl_out{b,w,l} for SuperH specific I/O.
  24  * which are processor specific. Address should be the result of
  25  * onchip_remap();
  26  */
  27
  28 #include <linux/compiler.h>
  29 #include <asm/cache.h>
  30 #include <asm/system.h>
  31 #include <asm/page.h>
  32 #include <asm-generic/iomap.h>
  33
  34 #define virt_to_bus virt_to_phys
  35 #define bus_to_virt phys_to_virt
  36 #define page_to_bus page_to_phys
  37
  38 /*
  39  * Nothing overly special here.. instead of doing the same thing
  40  * over and over again, we just define a set of sh64_in/out functions
  41  * with an implicit size. The traditional read{b,w,l}/write{b,w,l}
  42  * mess is wrapped to this, as are the SH-specific ctrl_in/out routines.
  43  */
  44 static inline unsigned char sh64_in8(const volatile void __iomem *addr)
  45 {
  46         return *(volatile unsigned char __force *)addr;
  47 }
  48
  49 static inline unsigned short sh64_in16(const volatile void __iomem *addr)
  50 {
  51         return *(volatile unsigned short __force *)addr;
  52 }
  53
  54 static inline unsigned int sh64_in32(const volatile void __iomem *addr)
  55 {
  56         return *(volatile unsigned int __force *)addr;
  57 }
  58
  59 static inline unsigned long long sh64_in64(const volatile void __iomem *addr)
  60 {
  61         return *(volatile unsigned long long __force *)addr;
  62 }
  63
  64 static inline void sh64_out8(unsigned char b, volatile void __iomem *addr)
  65 {
  66         *(volatile unsigned char __force *)addr = b;
  67         wmb();
  68 }
  69
  70 static inline void sh64_out16(unsigned short b, volatile void __iomem *addr)
  71 {
  72         *(volatile unsigned short __force *)addr = b;
  73         wmb();
  74 }
  75
  76 static inline void sh64_out32(unsigned int b, volatile void __iomem *addr)
  77 {
  78         *(volatile unsigned int __force *)addr = b;
  79         wmb();
  80 }
  81
  82 static inline void sh64_out64(unsigned long long b, volatile void __iomem *addr)
  83 {
  84         *(volatile unsigned long long __force *)addr = b;
  85         wmb();
  86 }
  87
  88 #define readb(addr)             sh64_in8(addr)
  89 #define readw(addr)             sh64_in16(addr)
  90 #define readl(addr)             sh64_in32(addr)
  91 #define readb_relaxed(addr)     sh64_in8(addr)
  92 #define readw_relaxed(addr)     sh64_in16(addr)
  93 #define readl_relaxed(addr)     sh64_in32(addr)
  94
  95 #define writeb(b, addr)         sh64_out8(b, addr)
  96 #define writew(b, addr)         sh64_out16(b, addr)
  97 #define writel(b, addr)         sh64_out32(b, addr)
  98
  99 #define ctrl_inb(addr)          sh64_in8(ioport_map(addr, 1))
 100 #define ctrl_inw(addr)          sh64_in16(ioport_map(addr, 2))
 101 #define ctrl_inl(addr)          sh64_in32(ioport_map(addr, 4))
 102
 103 #define ctrl_outb(b, addr)      sh64_out8(b, ioport_map(addr, 1))
 104 #define ctrl_outw(b, addr)      sh64_out16(b, ioport_map(addr, 2))
 105 #define ctrl_outl(b, addr)      sh64_out32(b, ioport_map(addr, 4))
 106
 107 #define ioread8(addr)           sh64_in8(addr)
 108 #define ioread16(addr)          sh64_in16(addr)
 109 #define ioread32(addr)          sh64_in32(addr)
 110 #define iowrite8(b, addr)       sh64_out8(b, addr)
 111 #define iowrite16(b, addr)      sh64_out16(b, addr)
 112 #define iowrite32(b, addr)      sh64_out32(b, addr)
 113
 114 #define inb(addr)               ctrl_inb(addr)
 115 #define inw(addr)               ctrl_inw(addr)
 116 #define inl(addr)               ctrl_inl(addr)
 117 #define outb(b, addr)           ctrl_outb(b, addr)
 118 #define outw(b, addr)           ctrl_outw(b, addr)
 119 #define outl(b, addr)           ctrl_outl(b, addr)
 120
 121 void outsw(unsigned long port, const void *addr, unsigned long count);
 122 void insw(unsigned long port, void *addr, unsigned long count);
 123 void outsl(unsigned long port, const void *addr, unsigned long count);
 124 void insl(unsigned long port, void *addr, unsigned long count);
 125
 126 void memcpy_toio(void __iomem *to, const void *from, long count);
 127 void memcpy_fromio(void *to, void __iomem *from, long count);
 128
 129 #define mmiowb()
 130
 131 #ifdef __KERNEL__
 132
 133 #ifdef CONFIG_SH_CAYMAN
 134 extern unsigned long smsc_superio_virt;
 135 #endif
 136 #ifdef CONFIG_PCI
 137 extern unsigned long pciio_virt;
 138 #endif
 139
 140 #define IO_SPACE_LIMIT 0xffffffff
 141
 142 /*
 143  * Change virtual addresses to physical addresses and vv.
 144  * These are trivial on the 1:1 Linux/SuperH mapping
 145  */
 146 extern __inline__ unsigned long virt_to_phys(volatile void * address)
 147 {
 148         return __pa(address);
 149 }
 150
 151 extern __inline__ void * phys_to_virt(unsigned long address)
 152 {
 153         return __va(address);
 154 }
 155
 156 extern void * __ioremap(unsigned long phys_addr, unsigned long size,
 157                         unsigned long flags);
 158
 159 extern __inline__ void * ioremap(unsigned long phys_addr, unsigned long size)
 160 {
 161         return __ioremap(phys_addr, size, 1);
 162 }
 163
 164 extern __inline__ void * ioremap_nocache (unsigned long phys_addr, unsigned long size)
 165 {
 166         return __ioremap(phys_addr, size, 0);
 167 }
 168
 169 extern void iounmap(void *addr);
 170
 171 unsigned long onchip_remap(unsigned long addr, unsigned long size, const char* name);
 172 extern void onchip_unmap(unsigned long vaddr);
 173
 174 static __inline__ int check_signature(volatile void __iomem *io_addr,
 175                         const unsigned char *signature, int length)
 176 {
 177         int retval = 0;
 178         do {
 179                 if (readb(io_addr) != *signature)
 180                         goto out;
 181                 io_addr++;
 182                 signature++;
 183                 length--;
 184         } while (length);
 185         retval = 1;
 186 out:
 187         return retval;
 188 }
 189
 190 /*
 191  * The caches on some architectures aren't dma-coherent and have need to
 192  * handle this in software.  There are three types of operations that
 193  * can be applied to dma buffers.
 194  *
 195  *  - dma_cache_wback_inv(start, size) makes caches and RAM coherent by
 196  *    writing the content of the caches back to memory, if necessary.
 197  *    The function also invalidates the affected part of the caches as
 198  *    necessary before DMA transfers from outside to memory.
 199  *  - dma_cache_inv(start, size) invalidates the affected parts of the
 200  *    caches.  Dirty lines of the caches may be written back or simply
 201  *    be discarded.  This operation is necessary before dma operations
 202  *    to the memory.
 203  *  - dma_cache_wback(start, size) writes back any dirty lines but does
 204  *    not invalidate the cache.  This can be used before DMA reads from
 205  *    memory,
 206  */
 207
 208 static __inline__ void dma_cache_wback_inv (unsigned long start, unsigned long size)
 209 {
 210         unsigned long s = start & L1_CACHE_ALIGN_MASK;
 211         unsigned long e = (start + size) & L1_CACHE_ALIGN_MASK;
 212
 213         for (; s <= e; s += L1_CACHE_BYTES)
 214                 asm volatile ("ocbp     %0, 0" : : "r" (s));
 215 }
 216
 217 static __inline__ void dma_cache_inv (unsigned long start, unsigned long size)
 218 {
 219         // Note that caller has to be careful with overzealous
 220         // invalidation should there be partial cache lines at the extremities
 221         // of the specified range
 222         unsigned long s = start & L1_CACHE_ALIGN_MASK;
 223         unsigned long e = (start + size) & L1_CACHE_ALIGN_MASK;
 224
 225         for (; s <= e; s += L1_CACHE_BYTES)
 226                 asm volatile ("ocbi     %0, 0" : : "r" (s));
 227 }
 228
 229 static __inline__ void dma_cache_wback (unsigned long start, unsigned long size)
 230 {
 231         unsigned long s = start & L1_CACHE_ALIGN_MASK;
 232         unsigned long e = (start + size) & L1_CACHE_ALIGN_MASK;
 233
 234         for (; s <= e; s += L1_CACHE_BYTES)
 235                 asm volatile ("ocbwb    %0, 0" : : "r" (s));
 236 }
 237
 238 /*
 239  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 240  * access
 241  */
 242 #define xlate_dev_mem_ptr(p)    __va(p)
 243
 244 /*
 245  * Convert a virtual cached pointer to an uncached pointer
 246  */
 247 #define xlate_dev_kmem_ptr(p)   p
 248
 249 #endif /* __KERNEL__ */
 250 #endif /* __ASM_SH64_IO_H */