sim/bfin/dv-eth_phy.c

   1 /* Ethernet Physical Receiver model.
   2
   3    Copyright (C) 2010-2020 Free Software Foundation, Inc.
   4    Contributed by Analog Devices, Inc.
   5
   6    This file is part of simulators.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22
  23 #include "sim-main.h"
  24 #include "devices.h"
  25
  26 #if defined (HAVE_LINUX_MII_H) && defined (HAVE_LINUX_TYPES_H)
  27
  28 /* Workaround old/broken linux headers.  */
  29 #include <linux/types.h>
  30 #include <linux/mii.h>
  31
  32 #define REG_PHY_SIZE 0x20
  33
  34 struct eth_phy
  35 {
  36   bu32 base;
  37   bu16 regs[REG_PHY_SIZE];
  38 };
  39 #define reg_base()      offsetof(struct eth_phy, regs[0])
  40 #define reg_offset(reg) (offsetof(struct eth_phy, reg) - reg_base())
  41 #define reg_idx(reg)    (reg_offset (reg) / 4)
  42
  43 static const char * const reg_names[] =
  44 {
  45   [MII_BMCR       ] = "MII_BMCR",
  46   [MII_BMSR       ] = "MII_BMSR",
  47   [MII_PHYSID1    ] = "MII_PHYSID1",
  48   [MII_PHYSID2    ] = "MII_PHYSID2",
  49   [MII_ADVERTISE  ] = "MII_ADVERTISE",
  50   [MII_LPA        ] = "MII_LPA",
  51   [MII_EXPANSION  ] = "MII_EXPANSION",
  52 #ifdef MII_CTRL1000
  53   [MII_CTRL1000   ] = "MII_CTRL1000",
  54 #endif
  55 #ifdef MII_STAT1000
  56   [MII_STAT1000   ] = "MII_STAT1000",
  57 #endif
  58 #ifdef MII_ESTATUS
  59   [MII_ESTATUS    ] = "MII_ESTATUS",
  60 #endif
  61   [MII_DCOUNTER   ] = "MII_DCOUNTER",
  62   [MII_FCSCOUNTER ] = "MII_FCSCOUNTER",
  63   [MII_NWAYTEST   ] = "MII_NWAYTEST",
  64   [MII_RERRCOUNTER] = "MII_RERRCOUNTER",
  65   [MII_SREVISION  ] = "MII_SREVISION",
  66   [MII_RESV1      ] = "MII_RESV1",
  67   [MII_LBRERROR   ] = "MII_LBRERROR",
  68   [MII_PHYADDR    ] = "MII_PHYADDR",
  69   [MII_RESV2      ] = "MII_RESV2",
  70   [MII_TPISTATUS  ] = "MII_TPISTATUS",
  71   [MII_NCONFIG    ] = "MII_NCONFIG",
  72 };
  73 #define mmr_name(off) (reg_names[off] ? : "<INV>")
  74 #define mmr_off reg_off
  75
  76 static unsigned
  77 eth_phy_io_write_buffer (struct hw *me, const void *source,
  78                          int space, address_word addr, unsigned nr_bytes)
  79 {
  80   struct eth_phy *phy = hw_data (me);
  81   bu16 reg_off;
  82   bu16 value;
  83   bu16 *valuep;
  84
  85   value = dv_load_2 (source);
  86
  87   reg_off = addr - phy->base;
  88   valuep = (void *)((unsigned long)phy + reg_base() + reg_off);
  89
  90   HW_TRACE_WRITE ();
  91
  92   switch (reg_off)
  93     {
  94     case MII_BMCR:
  95       *valuep = value;
  96       break;
  97     case MII_PHYSID1:
  98     case MII_PHYSID2:
  99       /* Discard writes to these.  */
 100       break;
 101     default:
 102       /* XXX: Discard writes to unknown regs ?  */
 103       *valuep = value;
 104       break;
 105     }
 106
 107   return nr_bytes;
 108 }
 109
 110 static unsigned
 111 eth_phy_io_read_buffer (struct hw *me, void *dest,
 112                         int space, address_word addr, unsigned nr_bytes)
 113 {
 114   struct eth_phy *phy = hw_data (me);
 115   bu16 reg_off;
 116   bu16 *valuep;
 117
 118   reg_off = addr - phy->base;
 119   valuep = (void *)((unsigned long)phy + reg_base() + reg_off);
 120
 121   HW_TRACE_READ ();
 122
 123   switch (reg_off)
 124     {
 125     case MII_BMCR:
 126       dv_store_2 (dest, *valuep);
 127       break;
 128     case MII_BMSR:
 129       /* XXX: Let people control this ?  */
 130       *valuep = BMSR_100FULL | BMSR_100HALF | BMSR_10FULL | BMSR_10HALF |
 131                 BMSR_ANEGCOMPLETE | BMSR_ANEGCAPABLE | BMSR_LSTATUS;
 132       dv_store_2 (dest, *valuep);
 133       break;
 134     case MII_LPA:
 135       /* XXX: Let people control this ?  */
 136       *valuep = LPA_100FULL | LPA_100HALF | LPA_10FULL | LPA_10HALF;
 137       dv_store_2 (dest, *valuep);
 138       break;
 139     default:
 140       dv_store_2 (dest, *valuep);
 141       break;
 142     }
 143
 144   return nr_bytes;
 145 }
 146
 147 static void
 148 attach_eth_phy_regs (struct hw *me, struct eth_phy *phy)
 149 {
 150   address_word attach_address;
 151   int attach_space;
 152   unsigned attach_size;
 153   reg_property_spec reg;
 154
 155   if (hw_find_property (me, "reg") == NULL)
 156     hw_abort (me, "Missing \"reg\" property");
 157
 158   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 159     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 160
 161   hw_unit_address_to_attach_address (hw_parent (me),
 162                                      &reg.address,
 163                                      &attach_space, &attach_address, me);
 164   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 165
 166   if (attach_size != REG_PHY_SIZE)
 167     hw_abort (me, "\"reg\" size must be %#x", REG_PHY_SIZE);
 168
 169   hw_attach_address (hw_parent (me),
 170                      0, attach_space, attach_address, attach_size, me);
 171
 172   phy->base = attach_address;
 173 }
 174
 175 static void
 176 eth_phy_finish (struct hw *me)
 177 {
 178   struct eth_phy *phy;
 179
 180   phy = HW_ZALLOC (me, struct eth_phy);
 181
 182   set_hw_data (me, phy);
 183   set_hw_io_read_buffer (me, eth_phy_io_read_buffer);
 184   set_hw_io_write_buffer (me, eth_phy_io_write_buffer);
 185
 186   attach_eth_phy_regs (me, phy);
 187
 188   /* Initialize the PHY.  */
 189   phy->regs[MII_PHYSID1] = 0;    /* Unassigned Vendor */
 190   phy->regs[MII_PHYSID2] = 0xAD; /* Product */
 191 }
 192
 193 #else
 194
 195 static void
 196 eth_phy_finish (struct hw *me)
 197 {
 198   HW_TRACE ((me, "No linux/mii.h support found"));
 199 }
 200
 201 #endif
 202
 203 const struct hw_descriptor dv_eth_phy_descriptor[] =
 204 {
 205   {"eth_phy", eth_phy_finish,},
 206   {NULL, NULL},
 207 };