hw/misc/omap_l4.c

   1 /*
   2  * TI OMAP L4 interconnect emulation.
   3  *
   4  * Copyright (C) 2007-2009 Nokia Corporation
   5  * Written by Andrzej Zaborowski <andrew@openedhand.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 or
  10  * (at your option) any later version of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20 #include "qemu/osdep.h"
  21 #include "hw/hw.h"
  22 #include "hw/arm/omap.h"
  23
  24 struct omap_l4_s {
  25     MemoryRegion *address_space;
  26     hwaddr base;
  27     int ta_num;
  28     struct omap_target_agent_s ta[0];
  29 };
  30
  31 struct omap_l4_s *omap_l4_init(MemoryRegion *address_space,
  32                                hwaddr base, int ta_num)
  33 {
  34     struct omap_l4_s *bus = g_malloc0(
  35                     sizeof(*bus) + ta_num * sizeof(*bus->ta));
  36
  37     bus->address_space = address_space;
  38     bus->ta_num = ta_num;
  39     bus->base = base;
  40
  41     return bus;
  42 }
  43
  44 hwaddr omap_l4_region_base(struct omap_target_agent_s *ta,
  45                                        int region)
  46 {
  47     return ta->bus->base + ta->start[region].offset;
  48 }
  49
  50 hwaddr omap_l4_region_size(struct omap_target_agent_s *ta,
  51                                        int region)
  52 {
  53     return ta->start[region].size;
  54 }
  55
  56 static uint64_t omap_l4ta_read(void *opaque, hwaddr addr,
  57                                unsigned size)
  58 {
  59     struct omap_target_agent_s *s = (struct omap_target_agent_s *) opaque;
  60
  61     if (size != 2) {
  62         return omap_badwidth_read16(opaque, addr);
  63     }
  64
  65     switch (addr) {
  66     case 0x00:  /* COMPONENT */
  67         return s->component;
  68
  69     case 0x20:  /* AGENT_CONTROL */
  70         return s->control;
  71
  72     case 0x28:  /* AGENT_STATUS */
  73         return s->status;
  74     }
  75
  76     OMAP_BAD_REG(addr);
  77     return 0;
  78 }
  79
  80 static void omap_l4ta_write(void *opaque, hwaddr addr,
  81                             uint64_t value, unsigned size)
  82 {
  83     struct omap_target_agent_s *s = (struct omap_target_agent_s *) opaque;
  84
  85     if (size != 4) {
  86         omap_badwidth_write32(opaque, addr, value);
  87         return;
  88     }
  89
  90     switch (addr) {
  91     case 0x00:  /* COMPONENT */
  92     case 0x28:  /* AGENT_STATUS */
  93         OMAP_RO_REG(addr);
  94         break;
  95
  96     case 0x20:  /* AGENT_CONTROL */
  97         s->control = value & 0x01000700;
  98         if (value & 1)                                  /* OCP_RESET */
  99             s->status &= ~1;                            /* REQ_TIMEOUT */
 100         break;
 101
 102     default:
 103         OMAP_BAD_REG(addr);
 104     }
 105 }
 106
 107 static const MemoryRegionOps omap_l4ta_ops = {
 108     .read = omap_l4ta_read,
 109     .write = omap_l4ta_write,
 110     .endianness = DEVICE_NATIVE_ENDIAN,
 111 };
 112
 113 struct omap_target_agent_s *omap_l4ta_get(struct omap_l4_s *bus,
 114         const struct omap_l4_region_s *regions,
 115         const struct omap_l4_agent_info_s *agents,
 116         int cs)
 117 {
 118     int i;
 119     struct omap_target_agent_s *ta = NULL;
 120     const struct omap_l4_agent_info_s *info = NULL;
 121
 122     for (i = 0; i < bus->ta_num; i ++)
 123         if (agents[i].ta == cs) {
 124             ta = &bus->ta[i];
 125             info = &agents[i];
 126             break;
 127         }
 128     if (!ta) {
 129         fprintf(stderr, "%s: bad target agent (%i)\n", __FUNCTION__, cs);
 130         exit(-1);
 131     }
 132
 133     ta->bus = bus;
 134     ta->start = &regions[info->region];
 135     ta->regions = info->regions;
 136
 137     ta->component = ('Q' << 24) | ('E' << 16) | ('M' << 8) | ('U' << 0);
 138     ta->status = 0x00000000;
 139     ta->control = 0x00000200;   /* XXX 01000200 for L4TAO */
 140
 141     memory_region_init_io(&ta->iomem, NULL, &omap_l4ta_ops, ta, "omap.l4ta",
 142                           omap_l4_region_size(ta, info->ta_region));
 143     omap_l4_attach(ta, info->ta_region, &ta->iomem);
 144
 145     return ta;
 146 }
 147
 148 hwaddr omap_l4_attach(struct omap_target_agent_s *ta,
 149                                          int region, MemoryRegion *mr)
 150 {
 151     hwaddr base;
 152
 153     if (region < 0 || region >= ta->regions) {
 154         fprintf(stderr, "%s: bad io region (%i)\n", __FUNCTION__, region);
 155         exit(-1);
 156     }
 157
 158     base = ta->bus->base + ta->start[region].offset;
 159     if (mr) {
 160         memory_region_add_subregion(ta->bus->address_space, base, mr);
 161     }
 162
 163     return base;
 164 }