drivers/char/ipmi/ipmi_si_port_io.c

   1
   2 #include <linux/io.h>
   3 #include "ipmi_si.h"
   4
   5 static unsigned char port_inb(const struct si_sm_io *io, unsigned int offset)
   6 {
   7         unsigned int addr = io->addr_data;
   8
   9         return inb(addr + (offset * io->regspacing));
  10 }
  11
  12 static void port_outb(const struct si_sm_io *io, unsigned int offset,
  13                       unsigned char b)
  14 {
  15         unsigned int addr = io->addr_data;
  16
  17         outb(b, addr + (offset * io->regspacing));
  18 }
  19
  20 static unsigned char port_inw(const struct si_sm_io *io, unsigned int offset)
  21 {
  22         unsigned int addr = io->addr_data;
  23
  24         return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
  25 }
  26
  27 static void port_outw(const struct si_sm_io *io, unsigned int offset,
  28                       unsigned char b)
  29 {
  30         unsigned int addr = io->addr_data;
  31
  32         outw(b << io->regshift, addr + (offset * io->regspacing));
  33 }
  34
  35 static unsigned char port_inl(const struct si_sm_io *io, unsigned int offset)
  36 {
  37         unsigned int addr = io->addr_data;
  38
  39         return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
  40 }
  41
  42 static void port_outl(const struct si_sm_io *io, unsigned int offset,
  43                       unsigned char b)
  44 {
  45         unsigned int addr = io->addr_data;
  46
  47         outl(b << io->regshift, addr+(offset * io->regspacing));
  48 }
  49
  50 static void port_cleanup(struct si_sm_io *io)
  51 {
  52         unsigned int addr = io->addr_data;
  53         int          idx;
  54
  55         if (addr) {
  56                 for (idx = 0; idx < io->io_size; idx++)
  57                         release_region(addr + idx * io->regspacing,
  58                                        io->regsize);
  59         }
  60 }
  61
  62 int ipmi_si_port_setup(struct si_sm_io *io)
  63 {
  64         unsigned int addr = io->addr_data;
  65         int          idx;
  66
  67         if (!addr)
  68                 return -ENODEV;
  69
  70         io->io_cleanup = port_cleanup;
  71
  72         /*
  73          * Figure out the actual inb/inw/inl/etc routine to use based
  74          * upon the register size.
  75          */
  76         switch (io->regsize) {
  77         case 1:
  78                 io->inputb = port_inb;
  79                 io->outputb = port_outb;
  80                 break;
  81         case 2:
  82                 io->inputb = port_inw;
  83                 io->outputb = port_outw;
  84                 break;
  85         case 4:
  86                 io->inputb = port_inl;
  87                 io->outputb = port_outl;
  88                 break;
  89         default:
  90                 dev_warn(io->dev, "Invalid register size: %d\n",
  91                          io->regsize);
  92                 return -EINVAL;
  93         }
  94
  95         /*
  96          * Some BIOSes reserve disjoint I/O regions in their ACPI
  97          * tables.  This causes problems when trying to register the
  98          * entire I/O region.  Therefore we must register each I/O
  99          * port separately.
 100          */
 101         for (idx = 0; idx < io->io_size; idx++) {
 102                 if (request_region(addr + idx * io->regspacing,
 103                                    io->regsize, DEVICE_NAME) == NULL) {
 104                         /* Undo allocations */
 105                         while (idx--)
 106                                 release_region(addr + idx * io->regspacing,
 107                                                io->regsize);
 108                         return -EIO;
 109                 }
 110         }
 111         return 0;
 112 }