1 /* 2 * Allwinner R40 SRAM controller emulation 3 * 4 * Copyright (C) 2023 qianfan Zhao <qianfanguijin@163.com> 5 * 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "qemu/units.h" 22 #include "hw/sysbus.h" 23 #include "migration/vmstate.h" 24 #include "qemu/log.h" 25 #include "qemu/module.h" 26 #include "qapi/error.h" 27 #include "hw/qdev-properties.h" 28 #include "hw/qdev-properties-system.h" 29 #include "hw/misc/allwinner-sramc.h" 30 #include "trace.h" 31 32 /* 33 * register offsets 34 * https://linux-sunxi.org/SRAM_Controller_Register_Guide 35 */ 36 enum { 37 REG_SRAM_CTL1_CFG = 0x04, /* SRAM Control register 1 */ 38 REG_SRAM_VER = 0x24, /* SRAM Version register */ 39 REG_SRAM_R40_SOFT_ENTRY_REG0 = 0xbc, 40 }; 41 42 /* REG_SRAMC_VERSION bit defines */ 43 #define SRAM_VER_READ_ENABLE (1 << 15) 44 #define SRAM_VER_VERSION_SHIFT 16 45 #define SRAM_VERSION_SUN8I_R40 0x1701 46 47 static uint64_t allwinner_sramc_read(void *opaque, hwaddr offset, 48 unsigned size) 49 { 50 AwSRAMCState *s = AW_SRAMC(opaque); 51 AwSRAMCClass *sc = AW_SRAMC_GET_CLASS(s); 52 uint64_t val = 0; 53 54 switch (offset) { 55 case REG_SRAM_CTL1_CFG: 56 val = s->sram_ctl1; 57 break; 58 case REG_SRAM_VER: 59 /* bit15: lock bit, set this bit before reading this register */ 60 if (s->sram_ver & SRAM_VER_READ_ENABLE) { 61 val = SRAM_VER_READ_ENABLE | 62 (sc->sram_version_code << SRAM_VER_VERSION_SHIFT); 63 } 64 break; 65 case REG_SRAM_R40_SOFT_ENTRY_REG0: 66 val = s->sram_soft_entry_reg0; 67 break; 68 default: 69 qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n", 70 __func__, (uint32_t)offset); 71 return 0; 72 } 73 74 trace_allwinner_sramc_read(offset, val); 75 76 return val; 77 } 78 79 static void allwinner_sramc_write(void *opaque, hwaddr offset, 80 uint64_t val, unsigned size) 81 { 82 AwSRAMCState *s = AW_SRAMC(opaque); 83 84 trace_allwinner_sramc_write(offset, val); 85 86 switch (offset) { 87 case REG_SRAM_CTL1_CFG: 88 s->sram_ctl1 = val; 89 break; 90 case REG_SRAM_VER: 91 /* Only the READ_ENABLE bit is writeable */ 92 s->sram_ver = val & SRAM_VER_READ_ENABLE; 93 break; 94 case REG_SRAM_R40_SOFT_ENTRY_REG0: 95 s->sram_soft_entry_reg0 = val; 96 break; 97 default: 98 qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n", 99 __func__, (uint32_t)offset); 100 break; 101 } 102 } 103 104 static const MemoryRegionOps allwinner_sramc_ops = { 105 .read = allwinner_sramc_read, 106 .write = allwinner_sramc_write, 107 .endianness = DEVICE_NATIVE_ENDIAN, 108 .valid = { 109 .min_access_size = 4, 110 .max_access_size = 4, 111 }, 112 .impl.min_access_size = 4, 113 }; 114 115 static const VMStateDescription allwinner_sramc_vmstate = { 116 .name = "allwinner-sramc", 117 .version_id = 1, 118 .minimum_version_id = 1, 119 .fields = (const VMStateField[]) { 120 VMSTATE_UINT32(sram_ver, AwSRAMCState), 121 VMSTATE_UINT32(sram_soft_entry_reg0, AwSRAMCState), 122 VMSTATE_END_OF_LIST() 123 } 124 }; 125 126 static void allwinner_sramc_reset(DeviceState *dev) 127 { 128 AwSRAMCState *s = AW_SRAMC(dev); 129 AwSRAMCClass *sc = AW_SRAMC_GET_CLASS(s); 130 131 switch (sc->sram_version_code) { 132 case SRAM_VERSION_SUN8I_R40: 133 s->sram_ctl1 = 0x1300; 134 break; 135 } 136 } 137 138 static void allwinner_sramc_class_init(ObjectClass *klass, void *data) 139 { 140 DeviceClass *dc = DEVICE_CLASS(klass); 141 142 dc->reset = allwinner_sramc_reset; 143 dc->vmsd = &allwinner_sramc_vmstate; 144 } 145 146 static void allwinner_sramc_init(Object *obj) 147 { 148 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 149 AwSRAMCState *s = AW_SRAMC(obj); 150 151 /* Memory mapping */ 152 memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_sramc_ops, s, 153 TYPE_AW_SRAMC, 1 * KiB); 154 sysbus_init_mmio(sbd, &s->iomem); 155 } 156 157 static const TypeInfo allwinner_sramc_info = { 158 .name = TYPE_AW_SRAMC, 159 .parent = TYPE_SYS_BUS_DEVICE, 160 .instance_init = allwinner_sramc_init, 161 .instance_size = sizeof(AwSRAMCState), 162 .class_size = sizeof(AwSRAMCClass), 163 .class_init = allwinner_sramc_class_init, 164 }; 165 166 static void allwinner_r40_sramc_class_init(ObjectClass *klass, void *data) 167 { 168 AwSRAMCClass *sc = AW_SRAMC_CLASS(klass); 169 170 sc->sram_version_code = SRAM_VERSION_SUN8I_R40; 171 } 172 173 static const TypeInfo allwinner_r40_sramc_info = { 174 .name = TYPE_AW_SRAMC_SUN8I_R40, 175 .parent = TYPE_AW_SRAMC, 176 .class_init = allwinner_r40_sramc_class_init, 177 }; 178 179 static void allwinner_sramc_register(void) 180 { 181 type_register_static(&allwinner_sramc_info); 182 type_register_static(&allwinner_r40_sramc_info); 183 } 184 185 type_init(allwinner_sramc_register) 186