grub-core/bus/bonito.c

   1 /* bonito.c - PCI bonito interface.  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2009  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/pci.h>
  21 #include <grub/misc.h>
  22
  23 static grub_uint32_t base_win[GRUB_MACHINE_PCI_NUM_WIN];
  24 static const grub_size_t sizes_win[GRUB_MACHINE_PCI_NUM_WIN] =
  25   {GRUB_MACHINE_PCI_WIN1_SIZE, GRUB_MACHINE_PCI_WIN_SIZE,
  26    GRUB_MACHINE_PCI_WIN_SIZE};
  27 /* Usage counters.  */
  28 static int usage_win[GRUB_MACHINE_PCI_NUM_WIN];
  29 static grub_addr_t addr_win[GRUB_MACHINE_PCI_NUM_WIN] =
  30   {GRUB_MACHINE_PCI_WIN1_ADDR, GRUB_MACHINE_PCI_WIN2_ADDR,
  31    GRUB_MACHINE_PCI_WIN3_ADDR};
  32
  33 grub_bonito_type_t grub_bonito_type;
  34
  35 static volatile void *
  36 config_addr (grub_pci_address_t addr)
  37 {
  38   if (grub_bonito_type == GRUB_BONITO_2F)
  39     {
  40       GRUB_MACHINE_PCI_CONF_CTRL_REG_2F = 1 << ((addr >> 11) & 0xf);
  41       return (volatile void *) (GRUB_MACHINE_PCI_CONFSPACE_2F
  42                                 | (addr & 0x07ff));
  43     }
  44   else
  45     {
  46
  47       if (addr >> 16)
  48         return (volatile void *) (GRUB_MACHINE_PCI_CONFSPACE_3A_EXT | addr);
  49       else
  50         return (volatile void *) (GRUB_MACHINE_PCI_CONFSPACE_3A | addr);
  51     }
  52 }
  53
  54 grub_uint32_t
  55 grub_pci_read (grub_pci_address_t addr)
  56 {
  57   return *(volatile grub_uint32_t *) config_addr (addr);
  58 }
  59
  60 grub_uint16_t
  61 grub_pci_read_word (grub_pci_address_t addr)
  62 {
  63   return *(volatile grub_uint16_t *) config_addr (addr);
  64 }
  65
  66 grub_uint8_t
  67 grub_pci_read_byte (grub_pci_address_t addr)
  68 {
  69   return *(volatile grub_uint8_t *) config_addr (addr);
  70 }
  71
  72 void
  73 grub_pci_write (grub_pci_address_t addr, grub_uint32_t data)
  74 {
  75   *(volatile grub_uint32_t *) config_addr (addr) = data;
  76 }
  77
  78 void
  79 grub_pci_write_word (grub_pci_address_t addr, grub_uint16_t data)
  80 {
  81   *(volatile grub_uint16_t *) config_addr (addr) = data;
  82 }
  83
  84 void
  85 grub_pci_write_byte (grub_pci_address_t addr, grub_uint8_t data)
  86 {
  87   *(volatile grub_uint8_t *) config_addr (addr) = data;
  88 }
  89
  90
  91 static inline void
  92 write_bases_2f (void)
  93 {
  94   int i;
  95   grub_uint32_t reg = 0;
  96   for (i = 0; i < GRUB_MACHINE_PCI_NUM_WIN; i++)
  97     reg |= (((base_win[i] >> GRUB_MACHINE_PCI_WIN_SHIFT)
  98              & GRUB_MACHINE_PCI_WIN_MASK)
  99             << (i * GRUB_MACHINE_PCI_WIN_MASK_SIZE));
 100   GRUB_MACHINE_PCI_IO_CTRL_REG_2F = reg;
 101 }
 102
 103 volatile void *
 104 grub_pci_device_map_range (grub_pci_device_t dev __attribute__ ((unused)),
 105                            grub_addr_t base, grub_size_t size)
 106 {
 107   if (grub_bonito_type == GRUB_BONITO_2F)
 108     {
 109       int i;
 110       grub_addr_t newbase;
 111
 112       /* First try already used registers. */
 113       for (i = 0; i < GRUB_MACHINE_PCI_NUM_WIN; i++)
 114         if (usage_win[i] && base_win[i] <= base
 115             && base_win[i] + sizes_win[i] > base + size)
 116           {
 117             usage_win[i]++;
 118             return (void *)
 119               (addr_win[i] | (base & GRUB_MACHINE_PCI_WIN_OFFSET_MASK));
 120           }
 121       /* Map new register.  */
 122       newbase = base & ~GRUB_MACHINE_PCI_WIN_OFFSET_MASK;
 123       for (i = 0; i < GRUB_MACHINE_PCI_NUM_WIN; i++)
 124         if (!usage_win[i] && newbase <= base
 125             && newbase + sizes_win[i] > base + size)
 126           {
 127             usage_win[i]++;
 128             base_win[i] = newbase;
 129             write_bases_2f ();
 130             return (void *)
 131               (addr_win[i] | (base & GRUB_MACHINE_PCI_WIN_OFFSET_MASK));
 132           }
 133       grub_fatal ("Out of PCI windows.");
 134     }
 135   else
 136     {
 137       int region = 0;
 138       if (base >= 0x10000000
 139           && base + size <= 0x18000000)
 140         region = 1;
 141       if (base >= 0x1c000000
 142           && base + size <= 0x1f000000)
 143         region = 2;
 144       if (region == 0)
 145         grub_fatal ("Attempt to map out of regions");
 146       return (void *) (0xa0000000 | base);
 147     }
 148 }
 149
 150 void *
 151 grub_pci_device_map_range_cached (grub_pci_device_t dev,
 152                                   grub_addr_t base, grub_size_t size)
 153 {
 154   return (void *) (((grub_addr_t) grub_pci_device_map_range (dev, base, size))
 155                    & ~0x20000000);
 156 }
 157
 158 void
 159 grub_pci_device_unmap_range (grub_pci_device_t dev __attribute__ ((unused)),
 160                              volatile void *mem,
 161                              grub_size_t size __attribute__ ((unused)))
 162 {
 163   if (grub_bonito_type == GRUB_BONITO_2F)
 164     {
 165       int i;
 166       for (i = 0; i < GRUB_MACHINE_PCI_NUM_WIN; i++)
 167         if (usage_win[i] && addr_win[i]
 168             == (((grub_addr_t) mem | 0x20000000)
 169                 & ~GRUB_MACHINE_PCI_WIN_OFFSET_MASK))
 170           {
 171             usage_win[i]--;
 172             return;
 173           }
 174       grub_fatal ("Tried to unmap not mapped region");
 175     }
 176 }