hw/usb/imx-usb-phy.c

   1 /*
   2  * i.MX USB PHY
   3  *
   4  * Copyright (c) 2020 Guenter Roeck <linux@roeck-us.net>
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  *
   9  * We need to implement basic reset control in the PHY control register.
  10  * For everything else, it is sufficient to set whatever is written.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "hw/usb/imx-usb-phy.h"
  15 #include "migration/vmstate.h"
  16 #include "qemu/log.h"
  17 #include "qemu/module.h"
  18
  19 static const VMStateDescription vmstate_imx_usbphy = {
  20     .name = TYPE_IMX_USBPHY,
  21     .version_id = 1,
  22     .minimum_version_id = 1,
  23     .fields = (const VMStateField[]) {
  24         VMSTATE_UINT32_ARRAY(usbphy, IMXUSBPHYState, USBPHY_MAX),
  25         VMSTATE_END_OF_LIST()
  26     },
  27 };
  28
  29 static void imx_usbphy_softreset(IMXUSBPHYState *s)
  30 {
  31     s->usbphy[USBPHY_PWD] = 0x001e1c00;
  32     s->usbphy[USBPHY_TX] = 0x10060607;
  33     s->usbphy[USBPHY_RX] = 0x00000000;
  34     s->usbphy[USBPHY_CTRL] = 0xc0200000;
  35 }
  36
  37 static void imx_usbphy_reset(DeviceState *dev)
  38 {
  39     IMXUSBPHYState *s = IMX_USBPHY(dev);
  40
  41     s->usbphy[USBPHY_STATUS] = 0x00000000;
  42     s->usbphy[USBPHY_DEBUG] = 0x7f180000;
  43     s->usbphy[USBPHY_DEBUG0_STATUS] = 0x00000000;
  44     s->usbphy[USBPHY_DEBUG1] = 0x00001000;
  45     s->usbphy[USBPHY_VERSION] = 0x04020000;
  46
  47     imx_usbphy_softreset(s);
  48 }
  49
  50 static uint64_t imx_usbphy_read(void *opaque, hwaddr offset, unsigned size)
  51 {
  52     IMXUSBPHYState *s = (IMXUSBPHYState *)opaque;
  53     uint32_t index = offset >> 2;
  54     uint32_t value;
  55
  56     switch (index) {
  57     case USBPHY_PWD_SET:
  58     case USBPHY_TX_SET:
  59     case USBPHY_RX_SET:
  60     case USBPHY_CTRL_SET:
  61     case USBPHY_DEBUG_SET:
  62     case USBPHY_DEBUG1_SET:
  63         /*
  64          * All REG_NAME_SET register access are in fact targeting the
  65          * REG_NAME register.
  66          */
  67         value = s->usbphy[index - 1];
  68         break;
  69     case USBPHY_PWD_CLR:
  70     case USBPHY_TX_CLR:
  71     case USBPHY_RX_CLR:
  72     case USBPHY_CTRL_CLR:
  73     case USBPHY_DEBUG_CLR:
  74     case USBPHY_DEBUG1_CLR:
  75         /*
  76          * All REG_NAME_CLR register access are in fact targeting the
  77          * REG_NAME register.
  78          */
  79         value = s->usbphy[index - 2];
  80         break;
  81     case USBPHY_PWD_TOG:
  82     case USBPHY_TX_TOG:
  83     case USBPHY_RX_TOG:
  84     case USBPHY_CTRL_TOG:
  85     case USBPHY_DEBUG_TOG:
  86     case USBPHY_DEBUG1_TOG:
  87         /*
  88          * All REG_NAME_TOG register access are in fact targeting the
  89          * REG_NAME register.
  90          */
  91         value = s->usbphy[index - 3];
  92         break;
  93     default:
  94         if (index < USBPHY_MAX) {
  95             value = s->usbphy[index];
  96         } else {
  97             qemu_log_mask(LOG_GUEST_ERROR,
  98                           "%s: Read from non-existing USB PHY register 0x%"
  99                           HWADDR_PRIx "\n",
 100                           __func__, offset);
 101             value = 0;
 102         }
 103         break;
 104     }
 105     return (uint64_t)value;
 106 }
 107
 108 static void imx_usbphy_write(void *opaque, hwaddr offset, uint64_t value,
 109                              unsigned size)
 110 {
 111     IMXUSBPHYState *s = (IMXUSBPHYState *)opaque;
 112     uint32_t index = offset >> 2;
 113
 114     switch (index) {
 115     case USBPHY_CTRL:
 116         s->usbphy[index] = value;
 117         if (value & USBPHY_CTRL_SFTRST) {
 118             imx_usbphy_softreset(s);
 119         }
 120         break;
 121     case USBPHY_PWD:
 122     case USBPHY_TX:
 123     case USBPHY_RX:
 124     case USBPHY_STATUS:
 125     case USBPHY_DEBUG:
 126     case USBPHY_DEBUG1:
 127         s->usbphy[index] = value;
 128         break;
 129     case USBPHY_CTRL_SET:
 130         s->usbphy[index - 1] |= value;
 131         if (value & USBPHY_CTRL_SFTRST) {
 132             imx_usbphy_softreset(s);
 133         }
 134         break;
 135     case USBPHY_PWD_SET:
 136     case USBPHY_TX_SET:
 137     case USBPHY_RX_SET:
 138     case USBPHY_DEBUG_SET:
 139     case USBPHY_DEBUG1_SET:
 140         /*
 141          * All REG_NAME_SET register access are in fact targeting the
 142          * REG_NAME register. So we change the value of the REG_NAME
 143          * register, setting bits passed in the value.
 144          */
 145         s->usbphy[index - 1] |= value;
 146         break;
 147     case USBPHY_PWD_CLR:
 148     case USBPHY_TX_CLR:
 149     case USBPHY_RX_CLR:
 150     case USBPHY_CTRL_CLR:
 151     case USBPHY_DEBUG_CLR:
 152     case USBPHY_DEBUG1_CLR:
 153         /*
 154          * All REG_NAME_CLR register access are in fact targeting the
 155          * REG_NAME register. So we change the value of the REG_NAME
 156          * register, unsetting bits passed in the value.
 157          */
 158         s->usbphy[index - 2] &= ~value;
 159         break;
 160     case USBPHY_CTRL_TOG:
 161         s->usbphy[index - 3] ^= value;
 162         if ((value & USBPHY_CTRL_SFTRST) &&
 163             (s->usbphy[index - 3] & USBPHY_CTRL_SFTRST)) {
 164             imx_usbphy_softreset(s);
 165         }
 166         break;
 167     case USBPHY_PWD_TOG:
 168     case USBPHY_TX_TOG:
 169     case USBPHY_RX_TOG:
 170     case USBPHY_DEBUG_TOG:
 171     case USBPHY_DEBUG1_TOG:
 172         /*
 173          * All REG_NAME_TOG register access are in fact targeting the
 174          * REG_NAME register. So we change the value of the REG_NAME
 175          * register, toggling bits passed in the value.
 176          */
 177         s->usbphy[index - 3] ^= value;
 178         break;
 179     default:
 180         /* Other registers are read-only or do not exist */
 181         qemu_log_mask(LOG_GUEST_ERROR,
 182                       "%s: Write to %s USB PHY register 0x%"
 183                       HWADDR_PRIx "\n",
 184                       __func__,
 185                       index >= USBPHY_MAX ? "non-existing" : "read-only",
 186                       offset);
 187         break;
 188     }
 189 }
 190
 191 static const struct MemoryRegionOps imx_usbphy_ops = {
 192     .read = imx_usbphy_read,
 193     .write = imx_usbphy_write,
 194     .endianness = DEVICE_NATIVE_ENDIAN,
 195     .valid = {
 196         /*
 197          * Our device would not work correctly if the guest was doing
 198          * unaligned access. This might not be a limitation on the real
 199          * device but in practice there is no reason for a guest to access
 200          * this device unaligned.
 201          */
 202         .min_access_size = 4,
 203         .max_access_size = 4,
 204         .unaligned = false,
 205     },
 206 };
 207
 208 static void imx_usbphy_realize(DeviceState *dev, Error **errp)
 209 {
 210     IMXUSBPHYState *s = IMX_USBPHY(dev);
 211
 212     memory_region_init_io(&s->iomem, OBJECT(s), &imx_usbphy_ops, s,
 213                           "imx-usbphy", 0x1000);
 214     sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
 215 }
 216
 217 static void imx_usbphy_class_init(ObjectClass *klass, void *data)
 218 {
 219     DeviceClass *dc = DEVICE_CLASS(klass);
 220
 221     device_class_set_legacy_reset(dc, imx_usbphy_reset);
 222     dc->vmsd = &vmstate_imx_usbphy;
 223     dc->desc = "i.MX USB PHY Module";
 224     dc->realize = imx_usbphy_realize;
 225 }
 226
 227 static const TypeInfo imx_usbphy_info = {
 228     .name          = TYPE_IMX_USBPHY,
 229     .parent        = TYPE_SYS_BUS_DEVICE,
 230     .instance_size = sizeof(IMXUSBPHYState),
 231     .class_init    = imx_usbphy_class_init,
 232 };
 233
 234 static void imx_usbphy_register_types(void)
 235 {
 236     type_register_static(&imx_usbphy_info);
 237 }
 238
 239 type_init(imx_usbphy_register_types)