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/arm/omap.h"
  22
  23 struct omap_l4_s {
  24     MemoryRegion *address_space;
  25     hwaddr base;
  26     int ta_num;
  27     struct omap_target_agent_s ta[];
  28 };
  29
  30 struct omap_l4_s *omap_l4_init(MemoryRegion *address_space,
  31                                hwaddr base, int ta_num)
  32 {
  33     struct omap_l4_s *bus = g_malloc0(
  34                     sizeof(*bus) + ta_num * sizeof(*bus->ta));
  35
  36     bus->address_space = address_space;
  37     bus->ta_num = ta_num;
  38     bus->base = base;
  39
  40     return bus;
  41 }
  42
  43 hwaddr omap_l4_region_base(struct omap_target_agent_s *ta,
  44                                        int region)
  45 {
  46     return ta->bus->base + ta->start[region].offset;
  47 }
  48
  49 hwaddr omap_l4_region_size(struct omap_target_agent_s *ta,
  50                                        int region)
  51 {
  52     return ta->start[region].size;
  53 }
  54
  55 static uint64_t omap_l4ta_read(void *opaque, hwaddr addr,
  56                                unsigned size)
  57 {
  58     struct omap_target_agent_s *s = (struct omap_target_agent_s *) opaque;
  59
  60     if (size != 2) {
  61         return omap_badwidth_read16(opaque, addr);
  62     }
  63
  64     switch (addr) {
  65     case 0x00:  /* COMPONENT */
  66         return s->component;
  67
  68     case 0x20:  /* AGENT_CONTROL */
  69         return s->control;
  70
  71     case 0x28:  /* AGENT_STATUS */
  72         return s->status;
  73     }
  74
  75     OMAP_BAD_REG(addr);
  76     return 0;
  77 }
  78
  79 static void omap_l4ta_write(void *opaque, hwaddr addr,
  80                             uint64_t value, unsigned size)
  81 {
  82     struct omap_target_agent_s *s = (struct omap_target_agent_s *) opaque;
  83
  84     if (size != 4) {
  85         omap_badwidth_write32(opaque, addr, value);
  86         return;
  87     }
  88
  89     switch (addr) {
  90     case 0x00:  /* COMPONENT */
  91     case 0x28:  /* AGENT_STATUS */
  92         OMAP_RO_REG(addr);
  93         break;
  94
  95     case 0x20:  /* AGENT_CONTROL */
  96         s->control = value & 0x01000700;
  97         if (value & 1)                                  /* OCP_RESET */
  98             s->status &= ~1;                            /* REQ_TIMEOUT */
  99         break;
 100
 101     default:
 102         OMAP_BAD_REG(addr);
 103     }
 104 }
 105
 106 static const MemoryRegionOps omap_l4ta_ops = {
 107     .read = omap_l4ta_read,
 108     .write = omap_l4ta_write,
 109     .endianness = DEVICE_NATIVE_ENDIAN,
 110 };
 111
 112 struct omap_target_agent_s *omap_l4ta_get(struct omap_l4_s *bus,
 113         const struct omap_l4_region_s *regions,
 114         const struct omap_l4_agent_info_s *agents,
 115         int cs)
 116 {
 117     int i;
 118     struct omap_target_agent_s *ta = NULL;
 119     const struct omap_l4_agent_info_s *info = NULL;
 120
 121     for (i = 0; i < bus->ta_num; i ++)
 122         if (agents[i].ta == cs) {
 123             ta = &bus->ta[i];
 124             info = &agents[i];
 125             break;
 126         }
 127     if (!ta) {
 128         fprintf(stderr, "%s: bad target agent (%i)\n", __func__, cs);
 129         exit(-1);
 130     }
 131
 132     ta->bus = bus;
 133     ta->start = &regions[info->region];
 134     ta->regions = info->regions;
 135
 136     ta->component = ('Q' << 24) | ('E' << 16) | ('M' << 8) | ('U' << 0);
 137     ta->status = 0x00000000;
 138     ta->control = 0x00000200;   /* XXX 01000200 for L4TAO */
 139
 140     memory_region_init_io(&ta->iomem, NULL, &omap_l4ta_ops, ta, "omap.l4ta",
 141                           omap_l4_region_size(ta, info->ta_region));
 142     omap_l4_attach(ta, info->ta_region, &ta->iomem);
 143
 144     return ta;
 145 }
 146
 147 hwaddr omap_l4_attach(struct omap_target_agent_s *ta,
 148                                          int region, MemoryRegion *mr)
 149 {
 150     hwaddr base;
 151
 152     if (region < 0 || region >= ta->regions) {
 153         fprintf(stderr, "%s: bad io region (%i)\n", __func__, region);
 154         exit(-1);
 155     }
 156
 157     base = ta->bus->base + ta->start[region].offset;
 158     if (mr) {
 159         memory_region_add_subregion(ta->bus->address_space, base, mr);
 160     }
 161
 162     return base;
 163 }