arch/sh/boards/se/7751/io.c

   1 /*
   2  * linux/arch/sh/kernel/io_7751se.c
   3  *
   4  * Copyright (C) 2001  Ian da Silva, Jeremy Siegel
   5  * Based largely on io_se.c.
   6  *
   7  * I/O routine for Hitachi 7751 SolutionEngine.
   8  *
   9  * Initial version only to support LAN access; some
  10  * placeholder code from io_se.c left in with the
  11  * expectation of later SuperIO and PCMCIA access.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/types.h>
  16 #include <asm/io.h>
  17 #include <asm/se7751/se7751.h>
  18 #include <asm/addrspace.h>
  19
  20 #include <linux/pci.h>
  21 #include <asm/pci-sh7751.h>
  22
  23 #if 0
  24 /******************************************************************
  25  * Variables from io_se.c, related to PCMCIA (not PCI); we're not
  26  * compiling them in, and have removed references from functions
  27  * which follow.  [Many checked for IO ports in the range bounded
  28  * by sh_pcic_io_start/stop, and used sh_pcic_io_wbase as offset.
  29  * As start/stop are uninitialized, only port 0x0 would match?]
  30  * When used, remember to adjust names to avoid clash with io_se?
  31  *****************************************************************/
  32 /* SH pcmcia io window base, start and end.  */
  33 int sh_pcic_io_wbase = 0xb8400000;
  34 int sh_pcic_io_start;
  35 int sh_pcic_io_stop;
  36 int sh_pcic_io_type;
  37 int sh_pcic_io_dummy;
  38 /*************************************************************/
  39 #endif
  40
  41 /*
  42  * The 7751 Solution Engine uses the built-in PCI controller (PCIC)
  43  * of the 7751 processor, and has a SuperIO accessible via the PCI.
  44  * The board also includes a PCMCIA controller on its memory bus,
  45  * like the other Solution Engine boards.
  46  */
  47
  48 #define PCIIOBR         (volatile long *)PCI_REG(SH7751_PCIIOBR)
  49 #define PCIMBR          (volatile long *)PCI_REG(SH7751_PCIMBR)
  50 #define PCI_IO_AREA     SH7751_PCI_IO_BASE
  51 #define PCI_MEM_AREA    SH7751_PCI_CONFIG_BASE
  52
  53 #define PCI_IOMAP(adr)  (PCI_IO_AREA + (adr & ~SH7751_PCIIOBR_MASK))
  54
  55 #define maybebadio(name,port) \
  56   printk("bad PC-like io %s for port 0x%lx at 0x%08x\n", \
  57          #name, (port), (__u32) __builtin_return_address(0))
  58
  59 static inline void delay(void)
  60 {
  61         ctrl_inw(0xa0000000);
  62 }
  63
  64 static inline volatile __u16 *
  65 port2adr(unsigned int port)
  66 {
  67         if (port >= 0x2000)
  68                 return (volatile __u16 *) (PA_MRSHPC + (port - 0x2000));
  69 #if 0
  70         else
  71                 return (volatile __u16 *) (PA_SUPERIO + (port << 1));
  72 #endif
  73         maybebadio(name,(unsigned long)port);
  74         return (volatile __u16*)port;
  75 }
  76
  77 #if 0
  78 /* The 7751 Solution Engine seems to have everything hooked */
  79 /* up pretty normally (nothing on high-bytes only...) so this */
  80 /* shouldn't be needed */
  81 static inline int
  82 shifted_port(unsigned long port)
  83 {
  84         /* For IDE registers, value is not shifted */
  85         if ((0x1f0 <= port && port < 0x1f8) || port == 0x3f6)
  86                 return 0;
  87         else
  88                 return 1;
  89 }
  90 #endif
  91
  92 /* In case someone configures the kernel w/o PCI support: in that */
  93 /* scenario, don't ever bother to check for PCI-window addresses */
  94
  95 /* NOTE: WINDOW CHECK MAY BE A BIT OFF, HIGH PCIBIOS_MIN_IO WRAPS? */
  96 #if defined(CONFIG_PCI)
  97 #define CHECK_SH7751_PCIIO(port) \
  98   ((port >= PCIBIOS_MIN_IO) && (port < (PCIBIOS_MIN_IO + SH7751_PCI_IO_SIZE)))
  99 #else
 100 #define CHECK_SH7751_PCIIO(port) (0)
 101 #endif
 102
 103 /*
 104  * General outline: remap really low stuff [eventually] to SuperIO,
 105  * stuff in PCI IO space (at or above window at pci.h:PCIBIOS_MIN_IO)
 106  * is mapped through the PCI IO window.  Stuff with high bits (PXSEG)
 107  * should be way beyond the window, and is used  w/o translation for
 108  * compatibility.
 109  */
 110 unsigned char sh7751se_inb(unsigned long port)
 111 {
 112         if (PXSEG(port))
 113                 return *(volatile unsigned char *)port;
 114         else if (CHECK_SH7751_PCIIO(port))
 115                 return *(volatile unsigned char *)PCI_IOMAP(port);
 116         else
 117                 return (*port2adr(port))&0xff;
 118 }
 119
 120 unsigned char sh7751se_inb_p(unsigned long port)
 121 {
 122         unsigned char v;
 123
 124         if (PXSEG(port))
 125                 v = *(volatile unsigned char *)port;
 126         else if (CHECK_SH7751_PCIIO(port))
 127                 v = *(volatile unsigned char *)PCI_IOMAP(port);
 128         else
 129                 v = (*port2adr(port))&0xff;
 130         delay();
 131         return v;
 132 }
 133
 134 unsigned short sh7751se_inw(unsigned long port)
 135 {
 136         if (PXSEG(port))
 137                 return *(volatile unsigned short *)port;
 138         else if (CHECK_SH7751_PCIIO(port))
 139                 return *(volatile unsigned short *)PCI_IOMAP(port);
 140         else if (port >= 0x2000)
 141                 return *port2adr(port);
 142         else
 143                 maybebadio(inw, port);
 144         return 0;
 145 }
 146
 147 unsigned int sh7751se_inl(unsigned long port)
 148 {
 149         if (PXSEG(port))
 150                 return *(volatile unsigned long *)port;
 151         else if (CHECK_SH7751_PCIIO(port))
 152                 return *(volatile unsigned int *)PCI_IOMAP(port);
 153         else if (port >= 0x2000)
 154                 return *port2adr(port);
 155         else
 156                 maybebadio(inl, port);
 157         return 0;
 158 }
 159
 160 void sh7751se_outb(unsigned char value, unsigned long port)
 161 {
 162
 163         if (PXSEG(port))
 164                 *(volatile unsigned char *)port = value;
 165         else if (CHECK_SH7751_PCIIO(port))
 166                 *((unsigned char*)PCI_IOMAP(port)) = value;
 167         else
 168                 *(port2adr(port)) = value;
 169 }
 170
 171 void sh7751se_outb_p(unsigned char value, unsigned long port)
 172 {
 173         if (PXSEG(port))
 174                 *(volatile unsigned char *)port = value;
 175         else if (CHECK_SH7751_PCIIO(port))
 176                 *((unsigned char*)PCI_IOMAP(port)) = value;
 177         else
 178                 *(port2adr(port)) = value;
 179         delay();
 180 }
 181
 182 void sh7751se_outw(unsigned short value, unsigned long port)
 183 {
 184         if (PXSEG(port))
 185                 *(volatile unsigned short *)port = value;
 186         else if (CHECK_SH7751_PCIIO(port))
 187                 *((unsigned short *)PCI_IOMAP(port)) = value;
 188         else if (port >= 0x2000)
 189                 *port2adr(port) = value;
 190         else
 191                 maybebadio(outw, port);
 192 }
 193
 194 void sh7751se_outl(unsigned int value, unsigned long port)
 195 {
 196         if (PXSEG(port))
 197                 *(volatile unsigned long *)port = value;
 198         else if (CHECK_SH7751_PCIIO(port))
 199                 *((unsigned long*)PCI_IOMAP(port)) = value;
 200         else
 201                 maybebadio(outl, port);
 202 }
 203
 204 void sh7751se_insl(unsigned long port, void *addr, unsigned long count)
 205 {
 206         maybebadio(insl, port);
 207 }
 208
 209 void sh7751se_outsl(unsigned long port, const void *addr, unsigned long count)
 210 {
 211         maybebadio(outsw, port);
 212 }
 213
 214 /* Map ISA bus address to the real address. Only for PCMCIA.  */
 215
 216 /* ISA page descriptor.  */
 217 static __u32 sh_isa_memmap[256];
 218
 219 #if 0
 220 static int
 221 sh_isa_mmap(__u32 start, __u32 length, __u32 offset)
 222 {
 223         int idx;
 224
 225         if (start >= 0x100000 || (start & 0xfff) || (length != 0x1000))
 226                 return -1;
 227
 228         idx = start >> 12;
 229         sh_isa_memmap[idx] = 0xb8000000 + (offset &~ 0xfff);
 230         printk("sh_isa_mmap: start %x len %x offset %x (idx %x paddr %x)\n",
 231                start, length, offset, idx, sh_isa_memmap[idx]);
 232         return 0;
 233 }
 234 #endif
 235
 236 unsigned long
 237 sh7751se_isa_port2addr(unsigned long offset)
 238 {
 239         int idx;
 240
 241         idx = (offset >> 12) & 0xff;
 242         offset &= 0xfff;
 243         return sh_isa_memmap[idx] + offset;
 244 }