sim/bfin/dv-eth_phy.c

   1 /* Ethernet Physical Receiver model.
   2
   3    Copyright (C) 2010-2024 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 /* This must come before any other includes.  */
  22 #include "defs.h"
  23
  24 #include "sim-main.h"
  25 #include "devices.h"
  26
  27 #if defined (HAVE_LINUX_MII_H) && defined (HAVE_LINUX_TYPES_H)
  28
  29 /* Workaround old/broken linux headers.  */
  30 #include <linux/types.h>
  31 #include <linux/mii.h>
  32
  33 #define REG_PHY_SIZE 0x20
  34
  35 struct eth_phy
  36 {
  37   bu32 base;
  38   bu16 regs[REG_PHY_SIZE];
  39 };
  40 #define reg_base()      offsetof(struct eth_phy, regs[0])
  41 #define reg_offset(reg) (offsetof(struct eth_phy, reg) - reg_base())
  42 #define reg_idx(reg)    (reg_offset (reg) / 4)
  43
  44 static const char * const reg_names[] =
  45 {
  46   [MII_BMCR       ] = "MII_BMCR",
  47   [MII_BMSR       ] = "MII_BMSR",
  48   [MII_PHYSID1    ] = "MII_PHYSID1",
  49   [MII_PHYSID2    ] = "MII_PHYSID2",
  50   [MII_ADVERTISE  ] = "MII_ADVERTISE",
  51   [MII_LPA        ] = "MII_LPA",
  52   [MII_EXPANSION  ] = "MII_EXPANSION",
  53 #ifdef MII_CTRL1000
  54   [MII_CTRL1000   ] = "MII_CTRL1000",
  55 #endif
  56 #ifdef MII_STAT1000
  57   [MII_STAT1000   ] = "MII_STAT1000",
  58 #endif
  59 #ifdef MII_ESTATUS
  60   [MII_ESTATUS    ] = "MII_ESTATUS",
  61 #endif
  62   [MII_DCOUNTER   ] = "MII_DCOUNTER",
  63   [MII_FCSCOUNTER ] = "MII_FCSCOUNTER",
  64   [MII_NWAYTEST   ] = "MII_NWAYTEST",
  65   [MII_RERRCOUNTER] = "MII_RERRCOUNTER",
  66   [MII_SREVISION  ] = "MII_SREVISION",
  67   [MII_RESV1      ] = "MII_RESV1",
  68   [MII_LBRERROR   ] = "MII_LBRERROR",
  69   [MII_PHYADDR    ] = "MII_PHYADDR",
  70   [MII_RESV2      ] = "MII_RESV2",
  71   [MII_TPISTATUS  ] = "MII_TPISTATUS",
  72   [MII_NCONFIG    ] = "MII_NCONFIG",
  73 };
  74 #define mmr_name(off) (reg_names[off] ? : "<INV>")
  75 #define mmr_off reg_off
  76
  77 static unsigned
  78 eth_phy_io_write_buffer (struct hw *me, const void *source,
  79                          int space, address_word addr, unsigned nr_bytes)
  80 {
  81   struct eth_phy *phy = hw_data (me);
  82   bu16 reg_off;
  83   bu16 value;
  84   bu16 *valuep;
  85
  86   value = dv_load_2 (source);
  87
  88   reg_off = addr - phy->base;
  89   valuep = (void *)((uintptr_t)phy + reg_base() + reg_off);
  90
  91   HW_TRACE_WRITE ();
  92
  93   switch (reg_off)
  94     {
  95     case MII_BMCR:
  96       *valuep = value;
  97       break;
  98     case MII_PHYSID1:
  99     case MII_PHYSID2:
 100       /* Discard writes to these.  */
 101       break;
 102     default:
 103       /* XXX: Discard writes to unknown regs ?  */
 104       *valuep = value;
 105       break;
 106     }
 107
 108   return nr_bytes;
 109 }
 110
 111 static unsigned
 112 eth_phy_io_read_buffer (struct hw *me, void *dest,
 113                         int space, address_word addr, unsigned nr_bytes)
 114 {
 115   struct eth_phy *phy = hw_data (me);
 116   bu16 reg_off;
 117   bu16 *valuep;
 118
 119   reg_off = addr - phy->base;
 120   valuep = (void *)((uintptr_t)phy + reg_base() + reg_off);
 121
 122   HW_TRACE_READ ();
 123
 124   switch (reg_off)
 125     {
 126     case MII_BMCR:
 127       dv_store_2 (dest, *valuep);
 128       break;
 129     case MII_BMSR:
 130       /* XXX: Let people control this ?  */
 131       *valuep = BMSR_100FULL | BMSR_100HALF | BMSR_10FULL | BMSR_10HALF |
 132                 BMSR_ANEGCOMPLETE | BMSR_ANEGCAPABLE | BMSR_LSTATUS;
 133       dv_store_2 (dest, *valuep);
 134       break;
 135     case MII_LPA:
 136       /* XXX: Let people control this ?  */
 137       *valuep = LPA_100FULL | LPA_100HALF | LPA_10FULL | LPA_10HALF;
 138       dv_store_2 (dest, *valuep);
 139       break;
 140     default:
 141       dv_store_2 (dest, *valuep);
 142       break;
 143     }
 144
 145   return nr_bytes;
 146 }
 147
 148 static void
 149 attach_eth_phy_regs (struct hw *me, struct eth_phy *phy)
 150 {
 151   address_word attach_address;
 152   int attach_space;
 153   unsigned attach_size;
 154   reg_property_spec reg;
 155
 156   if (hw_find_property (me, "reg") == NULL)
 157     hw_abort (me, "Missing \"reg\" property");
 158
 159   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 160     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 161
 162   hw_unit_address_to_attach_address (hw_parent (me),
 163                                      &reg.address,
 164                                      &attach_space, &attach_address, me);
 165   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 166
 167   if (attach_size != REG_PHY_SIZE)
 168     hw_abort (me, "\"reg\" size must be %#x", REG_PHY_SIZE);
 169
 170   hw_attach_address (hw_parent (me),
 171                      0, attach_space, attach_address, attach_size, me);
 172
 173   phy->base = attach_address;
 174 }
 175
 176 static void
 177 eth_phy_finish (struct hw *me)
 178 {
 179   struct eth_phy *phy;
 180
 181   phy = HW_ZALLOC (me, struct eth_phy);
 182
 183   set_hw_data (me, phy);
 184   set_hw_io_read_buffer (me, eth_phy_io_read_buffer);
 185   set_hw_io_write_buffer (me, eth_phy_io_write_buffer);
 186
 187   attach_eth_phy_regs (me, phy);
 188
 189   /* Initialize the PHY.  */
 190   phy->regs[MII_PHYSID1] = 0;    /* Unassigned Vendor */
 191   phy->regs[MII_PHYSID2] = 0xAD; /* Product */
 192 }
 193
 194 #else
 195
 196 static void
 197 eth_phy_finish (struct hw *me)
 198 {
 199   HW_TRACE ((me, "No linux/mii.h support found"));
 200 }
 201
 202 #endif
 203
 204 const struct hw_descriptor dv_eth_phy_descriptor[] =
 205 {
 206   {"eth_phy", eth_phy_finish,},
 207   {NULL, NULL},
 208 };