1 /* 2 * Cadence SDHCI emulation 3 * 4 * Copyright (c) 2020 Wind River Systems, Inc. 5 * 6 * Author: 7 * Bin Meng <bin.meng@windriver.com> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation; either version 2 or 12 * (at your option) version 3 of the License. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, see <http://www.gnu.org/licenses/>. 21 */ 22 23 #include "qemu/osdep.h" 24 #include "qemu/bitops.h" 25 #include "qemu/error-report.h" 26 #include "qapi/error.h" 27 #include "migration/vmstate.h" 28 #include "hw/sd/cadence_sdhci.h" 29 #include "sdhci-internal.h" 30 31 /* HRS - Host Register Set (specific to Cadence) */ 32 33 #define CADENCE_SDHCI_HRS00 0x00 /* general information */ 34 #define CADENCE_SDHCI_HRS00_SWR BIT(0) 35 #define CADENCE_SDHCI_HRS00_POR_VAL 0x00010000 36 37 #define CADENCE_SDHCI_HRS04 0x10 /* PHY access port */ 38 #define CADENCE_SDHCI_HRS04_WR BIT(24) 39 #define CADENCE_SDHCI_HRS04_RD BIT(25) 40 #define CADENCE_SDHCI_HRS04_ACK BIT(26) 41 42 #define CADENCE_SDHCI_HRS06 0x18 /* eMMC control */ 43 #define CADENCE_SDHCI_HRS06_TUNE_UP BIT(15) 44 45 /* SRS - Slot Register Set (SDHCI-compatible) */ 46 47 #define CADENCE_SDHCI_SRS_BASE 0x200 48 49 #define TO_REG(addr) ((addr) / sizeof(uint32_t)) 50 51 static void cadence_sdhci_instance_init(Object *obj) 52 { 53 CadenceSDHCIState *s = CADENCE_SDHCI(obj); 54 55 object_initialize_child(OBJECT(s), "generic-sdhci", 56 &s->sdhci, TYPE_SYSBUS_SDHCI); 57 } 58 59 static void cadence_sdhci_reset(DeviceState *dev) 60 { 61 CadenceSDHCIState *s = CADENCE_SDHCI(dev); 62 63 memset(s->regs, 0, CADENCE_SDHCI_REG_SIZE); 64 s->regs[TO_REG(CADENCE_SDHCI_HRS00)] = CADENCE_SDHCI_HRS00_POR_VAL; 65 66 device_cold_reset(DEVICE(&s->sdhci)); 67 } 68 69 static uint64_t cadence_sdhci_read(void *opaque, hwaddr addr, unsigned int size) 70 { 71 CadenceSDHCIState *s = opaque; 72 uint32_t val; 73 74 val = s->regs[TO_REG(addr)]; 75 76 return (uint64_t)val; 77 } 78 79 static void cadence_sdhci_write(void *opaque, hwaddr addr, uint64_t val, 80 unsigned int size) 81 { 82 CadenceSDHCIState *s = opaque; 83 uint32_t val32 = (uint32_t)val; 84 85 switch (addr) { 86 case CADENCE_SDHCI_HRS00: 87 /* 88 * The only writable bit is SWR (software reset) and it automatically 89 * clears to zero, so essentially this register remains unchanged. 90 */ 91 if (val32 & CADENCE_SDHCI_HRS00_SWR) { 92 cadence_sdhci_reset(DEVICE(s)); 93 } 94 95 break; 96 case CADENCE_SDHCI_HRS04: 97 /* 98 * Only emulate the ACK bit behavior when read or write transaction 99 * are requested. 100 */ 101 if (val32 & (CADENCE_SDHCI_HRS04_WR | CADENCE_SDHCI_HRS04_RD)) { 102 val32 |= CADENCE_SDHCI_HRS04_ACK; 103 } else { 104 val32 &= ~CADENCE_SDHCI_HRS04_ACK; 105 } 106 107 s->regs[TO_REG(addr)] = val32; 108 break; 109 case CADENCE_SDHCI_HRS06: 110 if (val32 & CADENCE_SDHCI_HRS06_TUNE_UP) { 111 val32 &= ~CADENCE_SDHCI_HRS06_TUNE_UP; 112 } 113 114 s->regs[TO_REG(addr)] = val32; 115 break; 116 default: 117 s->regs[TO_REG(addr)] = val32; 118 break; 119 } 120 } 121 122 static const MemoryRegionOps cadence_sdhci_ops = { 123 .read = cadence_sdhci_read, 124 .write = cadence_sdhci_write, 125 .endianness = DEVICE_NATIVE_ENDIAN, 126 .impl = { 127 .min_access_size = 4, 128 .max_access_size = 4, 129 }, 130 .valid = { 131 .min_access_size = 4, 132 .max_access_size = 4, 133 } 134 }; 135 136 static void cadence_sdhci_realize(DeviceState *dev, Error **errp) 137 { 138 CadenceSDHCIState *s = CADENCE_SDHCI(dev); 139 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 140 SysBusDevice *sbd_sdhci = SYS_BUS_DEVICE(&s->sdhci); 141 142 memory_region_init(&s->container, OBJECT(s), 143 "cadence.sdhci-container", 0x1000); 144 sysbus_init_mmio(sbd, &s->container); 145 146 memory_region_init_io(&s->iomem, OBJECT(s), &cadence_sdhci_ops, 147 s, TYPE_CADENCE_SDHCI, CADENCE_SDHCI_REG_SIZE); 148 memory_region_add_subregion(&s->container, 0, &s->iomem); 149 150 sysbus_realize(sbd_sdhci, errp); 151 memory_region_add_subregion(&s->container, CADENCE_SDHCI_SRS_BASE, 152 sysbus_mmio_get_region(sbd_sdhci, 0)); 153 154 /* propagate irq and "sd-bus" from generic-sdhci */ 155 sysbus_pass_irq(sbd, sbd_sdhci); 156 s->bus = qdev_get_child_bus(DEVICE(sbd_sdhci), "sd-bus"); 157 } 158 159 static const VMStateDescription vmstate_cadence_sdhci = { 160 .name = TYPE_CADENCE_SDHCI, 161 .version_id = 1, 162 .fields = (VMStateField[]) { 163 VMSTATE_UINT32_ARRAY(regs, CadenceSDHCIState, CADENCE_SDHCI_NUM_REGS), 164 VMSTATE_END_OF_LIST(), 165 }, 166 }; 167 168 static void cadence_sdhci_class_init(ObjectClass *classp, void *data) 169 { 170 DeviceClass *dc = DEVICE_CLASS(classp); 171 172 dc->desc = "Cadence SD/SDIO/eMMC Host Controller (SD4HC)"; 173 dc->realize = cadence_sdhci_realize; 174 dc->reset = cadence_sdhci_reset; 175 dc->vmsd = &vmstate_cadence_sdhci; 176 } 177 178 static TypeInfo cadence_sdhci_info = { 179 .name = TYPE_CADENCE_SDHCI, 180 .parent = TYPE_SYS_BUS_DEVICE, 181 .instance_size = sizeof(CadenceSDHCIState), 182 .instance_init = cadence_sdhci_instance_init, 183 .class_init = cadence_sdhci_class_init, 184 }; 185 186 static void cadence_sdhci_register_types(void) 187 { 188 type_register_static(&cadence_sdhci_info); 189 } 190 191 type_init(cadence_sdhci_register_types) 192