hw/sd/cadence_sdhci.c

   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)