include/asm-ia64/sn/io.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2000-2004 Silicon Graphics, Inc. All rights reserved.
   7  */
   8
   9 #ifndef _ASM_SN_IO_H
  10 #define _ASM_SN_IO_H
  11 #include <linux/compiler.h>
  12 #include <asm/intrinsics.h>
  13
  14 extern void * sn_io_addr(unsigned long port) __attribute_const__; /* Forward definition */
  15 extern void __sn_mmiowb(void); /* Forward definition */
  16
  17 extern int num_cnodes;
  18
  19 #define __sn_mf_a()   ia64_mfa()
  20
  21 extern void sn_dma_flush(unsigned long);
  22
  23 #define __sn_inb ___sn_inb
  24 #define __sn_inw ___sn_inw
  25 #define __sn_inl ___sn_inl
  26 #define __sn_outb ___sn_outb
  27 #define __sn_outw ___sn_outw
  28 #define __sn_outl ___sn_outl
  29 #define __sn_readb ___sn_readb
  30 #define __sn_readw ___sn_readw
  31 #define __sn_readl ___sn_readl
  32 #define __sn_readq ___sn_readq
  33 #define __sn_readb_relaxed ___sn_readb_relaxed
  34 #define __sn_readw_relaxed ___sn_readw_relaxed
  35 #define __sn_readl_relaxed ___sn_readl_relaxed
  36 #define __sn_readq_relaxed ___sn_readq_relaxed
  37
  38 /*
  39  * Convenience macros for setting/clearing bits using the above accessors
  40  */
  41
  42 #define __sn_setq_relaxed(addr, val) \
  43         writeq((__sn_readq_relaxed(addr) | (val)), (addr))
  44 #define __sn_clrq_relaxed(addr, val) \
  45         writeq((__sn_readq_relaxed(addr) & ~(val)), (addr))
  46
  47 /*
  48  * The following routines are SN Platform specific, called when
  49  * a reference is made to inX/outX set macros.  SN Platform
  50  * inX set of macros ensures that Posted DMA writes on the
  51  * Bridge is flushed.
  52  *
  53  * The routines should be self explainatory.
  54  */
  55
  56 static inline unsigned int
  57 ___sn_inb (unsigned long port)
  58 {
  59         volatile unsigned char *addr;
  60         unsigned char ret = -1;
  61
  62         if ((addr = sn_io_addr(port))) {
  63                 ret = *addr;
  64                 __sn_mf_a();
  65                 sn_dma_flush((unsigned long)addr);
  66         }
  67         return ret;
  68 }
  69
  70 static inline unsigned int
  71 ___sn_inw (unsigned long port)
  72 {
  73         volatile unsigned short *addr;
  74         unsigned short ret = -1;
  75
  76         if ((addr = sn_io_addr(port))) {
  77                 ret = *addr;
  78                 __sn_mf_a();
  79                 sn_dma_flush((unsigned long)addr);
  80         }
  81         return ret;
  82 }
  83
  84 static inline unsigned int
  85 ___sn_inl (unsigned long port)
  86 {
  87         volatile unsigned int *addr;
  88         unsigned int ret = -1;
  89
  90         if ((addr = sn_io_addr(port))) {
  91                 ret = *addr;
  92                 __sn_mf_a();
  93                 sn_dma_flush((unsigned long)addr);
  94         }
  95         return ret;
  96 }
  97
  98 static inline void
  99 ___sn_outb (unsigned char val, unsigned long port)
 100 {
 101         volatile unsigned char *addr;
 102
 103         if ((addr = sn_io_addr(port))) {
 104                 *addr = val;
 105                 __sn_mmiowb();
 106         }
 107 }
 108
 109 static inline void
 110 ___sn_outw (unsigned short val, unsigned long port)
 111 {
 112         volatile unsigned short *addr;
 113
 114         if ((addr = sn_io_addr(port))) {
 115                 *addr = val;
 116                 __sn_mmiowb();
 117         }
 118 }
 119
 120 static inline void
 121 ___sn_outl (unsigned int val, unsigned long port)
 122 {
 123         volatile unsigned int *addr;
 124
 125         if ((addr = sn_io_addr(port))) {
 126                 *addr = val;
 127                 __sn_mmiowb();
 128         }
 129 }
 130
 131 /*
 132  * The following routines are SN Platform specific, called when
 133  * a reference is made to readX/writeX set macros.  SN Platform
 134  * readX set of macros ensures that Posted DMA writes on the
 135  * Bridge is flushed.
 136  *
 137  * The routines should be self explainatory.
 138  */
 139
 140 static inline unsigned char
 141 ___sn_readb (const volatile void __iomem *addr)
 142 {
 143         unsigned char val;
 144
 145         val = *(volatile unsigned char __force *)addr;
 146         __sn_mf_a();
 147         sn_dma_flush((unsigned long)addr);
 148         return val;
 149 }
 150
 151 static inline unsigned short
 152 ___sn_readw (const volatile void __iomem *addr)
 153 {
 154         unsigned short val;
 155
 156         val = *(volatile unsigned short __force *)addr;
 157         __sn_mf_a();
 158         sn_dma_flush((unsigned long)addr);
 159         return val;
 160 }
 161
 162 static inline unsigned int
 163 ___sn_readl (const volatile void __iomem *addr)
 164 {
 165         unsigned int val;
 166
 167         val = *(volatile unsigned int __force *)addr;
 168         __sn_mf_a();
 169         sn_dma_flush((unsigned long)addr);
 170         return val;
 171 }
 172
 173 static inline unsigned long
 174 ___sn_readq (const volatile void __iomem *addr)
 175 {
 176         unsigned long val;
 177
 178         val = *(volatile unsigned long __force *)addr;
 179         __sn_mf_a();
 180         sn_dma_flush((unsigned long)addr);
 181         return val;
 182 }
 183
 184 /*
 185  * For generic and SN2 kernels, we have a set of fast access
 186  * PIO macros.  These macros are provided on SN Platform
 187  * because the normal inX and readX macros perform an
 188  * additional task of flushing Post DMA request on the Bridge.
 189  *
 190  * These routines should be self explainatory.
 191  */
 192
 193 static inline unsigned int
 194 sn_inb_fast (unsigned long port)
 195 {
 196         volatile unsigned char *addr = (unsigned char *)port;
 197         unsigned char ret;
 198
 199         ret = *addr;
 200         __sn_mf_a();
 201         return ret;
 202 }
 203
 204 static inline unsigned int
 205 sn_inw_fast (unsigned long port)
 206 {
 207         volatile unsigned short *addr = (unsigned short *)port;
 208         unsigned short ret;
 209
 210         ret = *addr;
 211         __sn_mf_a();
 212         return ret;
 213 }
 214
 215 static inline unsigned int
 216 sn_inl_fast (unsigned long port)
 217 {
 218         volatile unsigned int *addr = (unsigned int *)port;
 219         unsigned int ret;
 220
 221         ret = *addr;
 222         __sn_mf_a();
 223         return ret;
 224 }
 225
 226 static inline unsigned char
 227 ___sn_readb_relaxed (const volatile void __iomem *addr)
 228 {
 229         return *(volatile unsigned char __force *)addr;
 230 }
 231
 232 static inline unsigned short
 233 ___sn_readw_relaxed (const volatile void __iomem *addr)
 234 {
 235         return *(volatile unsigned short __force *)addr;
 236 }
 237
 238 static inline unsigned int
 239 ___sn_readl_relaxed (const volatile void __iomem *addr)
 240 {
 241         return *(volatile unsigned int __force *) addr;
 242 }
 243
 244 static inline unsigned long
 245 ___sn_readq_relaxed (const volatile void __iomem *addr)
 246 {
 247         return *(volatile unsigned long __force *) addr;
 248 }
 249
 250 struct pci_dev;
 251
 252 static inline int
 253 sn_pci_set_vchan(struct pci_dev *pci_dev, unsigned long *addr, int vchan)
 254 {
 255
 256         if (vchan > 1) {
 257                 return -1;
 258         }
 259
 260         if (!(*addr >> 32))     /* Using a mask here would be cleaner */
 261                 return 0;       /* but this generates better code */
 262
 263         if (vchan == 1) {
 264                 /* Set Bit 57 */
 265                 *addr |= (1UL << 57);
 266         } else {
 267                 /* Clear Bit 57 */
 268                 *addr &= ~(1UL << 57);
 269         }
 270
 271         return 0;
 272 }
 273
 274 #endif  /* _ASM_SN_IO_H */