arch/mips/jazz/io.c

   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  * Low level I/O functions for Jazz family machines.
   7  *
   8  * Copyright (C) 1997 by Ralf Baechle.
   9  */
  10 #include <linux/string.h>
  11 #include <linux/spinlock.h>
  12 #include <asm/mipsconfig.h>
  13 #include <asm/addrspace.h>
  14 #include <asm/system.h>
  15 #include <asm/jazz.h>
  16
  17 /*
  18  * Map an 16mb segment of the EISA address space to 0xe3000000;
  19  */
  20 static inline void map_eisa_address(unsigned long address)
  21 {
  22   /* XXX */
  23   /* We've got an wired entry in the TLB.  We just need to modify it.
  24      fast and clean.  But since we want to get rid of wired entries
  25      things are a little bit more complicated ... */
  26 }
  27
  28 static unsigned char jazz_readb(unsigned long addr)
  29 {
  30         unsigned char res;
  31
  32         map_eisa_address(addr);
  33         addr &= 0xffffff;
  34         res = *(volatile unsigned char *) (JAZZ_EISA_BASE + addr);
  35
  36         return res;
  37 }
  38
  39 static unsigned short jazz_readw(unsigned long addr)
  40 {
  41         unsigned short res;
  42
  43         map_eisa_address(addr);
  44         addr &= 0xffffff;
  45         res = *(volatile unsigned char *) (JAZZ_EISA_BASE + addr);
  46
  47         return res;
  48 }
  49
  50 static unsigned int jazz_readl(unsigned long addr)
  51 {
  52         unsigned int res;
  53
  54         map_eisa_address(addr);
  55         addr &= 0xffffff;
  56         res = *(volatile unsigned char *) (JAZZ_EISA_BASE + addr);
  57
  58         return res;
  59 }
  60
  61 static void jazz_writeb(unsigned char val, unsigned long addr)
  62 {
  63         map_eisa_address(addr);
  64         addr &= 0xffffff;
  65         *(volatile unsigned char *) (JAZZ_EISA_BASE + addr) = val;
  66 }
  67
  68 static void jazz_writew(unsigned short val, unsigned long addr)
  69 {
  70         map_eisa_address(addr);
  71         addr &= 0xffffff;
  72         *(volatile unsigned char *) (JAZZ_EISA_BASE + addr) = val;
  73 }
  74
  75 static void jazz_writel(unsigned int val, unsigned long addr)
  76 {
  77         map_eisa_address(addr);
  78         addr &= 0xffffff;
  79         *(volatile unsigned char *) (JAZZ_EISA_BASE + addr) = val;
  80 }
  81
  82 static void jazz_memset_io(unsigned long addr, int val, unsigned long len)
  83 {
  84         unsigned long waddr;
  85
  86         waddr = JAZZ_EISA_BASE | (addr & 0xffffff);
  87         while(len) {
  88                 unsigned long fraglen;
  89
  90                 fraglen = (~addr + 1) & 0xffffff;
  91                 fraglen = (fraglen < len) ? fraglen : len;
  92                 map_eisa_address(addr);
  93                 memset((char *)waddr, val, fraglen);
  94                 addr += fraglen;
  95                 waddr = waddr + fraglen - 0x1000000;
  96                 len -= fraglen;
  97         }
  98 }
  99
 100 static void jazz_memcpy_fromio(unsigned long to, unsigned long from, unsigned long len)
 101 {
 102         unsigned long waddr;
 103
 104         waddr = JAZZ_EISA_BASE | (from & 0xffffff);
 105         while(len) {
 106                 unsigned long fraglen;
 107
 108                 fraglen = (~from + 1) & 0xffffff;
 109                 fraglen = (fraglen < len) ? fraglen : len;
 110                 map_eisa_address(from);
 111                 memcpy((void *)to, (void *)waddr, fraglen);
 112                 to += fraglen;
 113                 from += fraglen;
 114                 waddr = waddr + fraglen - 0x1000000;
 115                 len -= fraglen;
 116         }
 117 }
 118
 119 static void jazz_memcpy_toio(unsigned long to, unsigned long from, unsigned long len)
 120 {
 121         unsigned long waddr;
 122
 123         waddr = JAZZ_EISA_BASE | (to & 0xffffff);
 124         while(len) {
 125                 unsigned long fraglen;
 126
 127                 fraglen = (~to + 1) & 0xffffff;
 128                 fraglen = (fraglen < len) ? fraglen : len;
 129                 map_eisa_address(to);
 130                 memcpy((char *)to + JAZZ_EISA_BASE, (void *)from, fraglen);
 131                 to += fraglen;
 132                 from += fraglen;
 133                 waddr = waddr + fraglen - 0x1000000;
 134                 len -= fraglen;
 135         }
 136 }