1 /* 2 * ARM dummy L210, L220, PL310 cache controller. 3 * 4 * Copyright (c) 2010-2012 Calxeda 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2 or any later version, as published by the Free Software 9 * Foundation. 10 * 11 * This program is distributed in the hope it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 * 19 */ 20 21 #include "hw/sysbus.h" 22 23 /* L2C-310 r3p2 */ 24 #define CACHE_ID 0x410000c8 25 26 typedef struct l2x0_state { 27 SysBusDevice busdev; 28 MemoryRegion iomem; 29 uint32_t cache_type; 30 uint32_t ctrl; 31 uint32_t aux_ctrl; 32 uint32_t data_ctrl; 33 uint32_t tag_ctrl; 34 uint32_t filter_start; 35 uint32_t filter_end; 36 } l2x0_state; 37 38 static const VMStateDescription vmstate_l2x0 = { 39 .name = "l2x0", 40 .version_id = 1, 41 .minimum_version_id = 1, 42 .fields = (VMStateField[]) { 43 VMSTATE_UINT32(ctrl, l2x0_state), 44 VMSTATE_UINT32(aux_ctrl, l2x0_state), 45 VMSTATE_UINT32(data_ctrl, l2x0_state), 46 VMSTATE_UINT32(tag_ctrl, l2x0_state), 47 VMSTATE_UINT32(filter_start, l2x0_state), 48 VMSTATE_UINT32(filter_end, l2x0_state), 49 VMSTATE_END_OF_LIST() 50 } 51 }; 52 53 54 static uint64_t l2x0_priv_read(void *opaque, hwaddr offset, 55 unsigned size) 56 { 57 uint32_t cache_data; 58 l2x0_state *s = (l2x0_state *)opaque; 59 offset &= 0xfff; 60 if (offset >= 0x730 && offset < 0x800) { 61 return 0; /* cache ops complete */ 62 } 63 switch (offset) { 64 case 0: 65 return CACHE_ID; 66 case 0x4: 67 /* aux_ctrl values affect cache_type values */ 68 cache_data = (s->aux_ctrl & (7 << 17)) >> 15; 69 cache_data |= (s->aux_ctrl & (1 << 16)) >> 16; 70 return s->cache_type |= (cache_data << 18) | (cache_data << 6); 71 case 0x100: 72 return s->ctrl; 73 case 0x104: 74 return s->aux_ctrl; 75 case 0x108: 76 return s->tag_ctrl; 77 case 0x10C: 78 return s->data_ctrl; 79 case 0xC00: 80 return s->filter_start; 81 case 0xC04: 82 return s->filter_end; 83 case 0xF40: 84 return 0; 85 case 0xF60: 86 return 0; 87 case 0xF80: 88 return 0; 89 default: 90 qemu_log_mask(LOG_GUEST_ERROR, 91 "l2x0_priv_read: Bad offset %x\n", (int)offset); 92 break; 93 } 94 return 0; 95 } 96 97 static void l2x0_priv_write(void *opaque, hwaddr offset, 98 uint64_t value, unsigned size) 99 { 100 l2x0_state *s = (l2x0_state *)opaque; 101 offset &= 0xfff; 102 if (offset >= 0x730 && offset < 0x800) { 103 /* ignore */ 104 return; 105 } 106 switch (offset) { 107 case 0x100: 108 s->ctrl = value & 1; 109 break; 110 case 0x104: 111 s->aux_ctrl = value; 112 break; 113 case 0x108: 114 s->tag_ctrl = value; 115 break; 116 case 0x10C: 117 s->data_ctrl = value; 118 break; 119 case 0xC00: 120 s->filter_start = value; 121 break; 122 case 0xC04: 123 s->filter_end = value; 124 break; 125 case 0xF40: 126 return; 127 case 0xF60: 128 return; 129 case 0xF80: 130 return; 131 default: 132 qemu_log_mask(LOG_GUEST_ERROR, 133 "l2x0_priv_write: Bad offset %x\n", (int)offset); 134 break; 135 } 136 } 137 138 static void l2x0_priv_reset(DeviceState *dev) 139 { 140 l2x0_state *s = DO_UPCAST(l2x0_state, busdev.qdev, dev); 141 142 s->ctrl = 0; 143 s->aux_ctrl = 0x02020000; 144 s->tag_ctrl = 0; 145 s->data_ctrl = 0; 146 s->filter_start = 0; 147 s->filter_end = 0; 148 } 149 150 static const MemoryRegionOps l2x0_mem_ops = { 151 .read = l2x0_priv_read, 152 .write = l2x0_priv_write, 153 .endianness = DEVICE_NATIVE_ENDIAN, 154 }; 155 156 static int l2x0_priv_init(SysBusDevice *dev) 157 { 158 l2x0_state *s = FROM_SYSBUS(l2x0_state, dev); 159 160 memory_region_init_io(&s->iomem, &l2x0_mem_ops, s, "l2x0_cc", 0x1000); 161 sysbus_init_mmio(dev, &s->iomem); 162 return 0; 163 } 164 165 static Property l2x0_properties[] = { 166 DEFINE_PROP_UINT32("cache-type", l2x0_state, cache_type, 0x1c100100), 167 DEFINE_PROP_END_OF_LIST(), 168 }; 169 170 static void l2x0_class_init(ObjectClass *klass, void *data) 171 { 172 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); 173 DeviceClass *dc = DEVICE_CLASS(klass); 174 175 k->init = l2x0_priv_init; 176 dc->vmsd = &vmstate_l2x0; 177 dc->no_user = 1; 178 dc->props = l2x0_properties; 179 dc->reset = l2x0_priv_reset; 180 } 181 182 static const TypeInfo l2x0_info = { 183 .name = "l2x0", 184 .parent = TYPE_SYS_BUS_DEVICE, 185 .instance_size = sizeof(l2x0_state), 186 .class_init = l2x0_class_init, 187 }; 188 189 static void l2x0_register_types(void) 190 { 191 type_register_static(&l2x0_info); 192 } 193 194 type_init(l2x0_register_types) 195