hw/misc/lasi.c

   1 /*
   2  * HP-PARISC Lasi chipset emulation.
   3  *
   4  * (C) 2019 by Helge Deller <deller@gmx.de>
   5  *
   6  * This work is licensed under the GNU GPL license version 2 or later.
   7  *
   8  * Documentation available at:
   9  * https://parisc.wiki.kernel.org/images-parisc/7/79/Lasi_ers.pdf
  10  */
  11
  12 #include "qemu/osdep.h"
  13 #include "qemu/units.h"
  14 #include "qemu/log.h"
  15 #include "qapi/error.h"
  16 #include "trace.h"
  17 #include "hw/irq.h"
  18 #include "sysemu/sysemu.h"
  19 #include "sysemu/runstate.h"
  20 #include "migration/vmstate.h"
  21 #include "qom/object.h"
  22 #include "hw/misc/lasi.h"
  23
  24
  25 static bool lasi_chip_mem_valid(void *opaque, hwaddr addr,
  26                                 unsigned size, bool is_write,
  27                                 MemTxAttrs attrs)
  28 {
  29     bool ret = false;
  30
  31     switch (addr) {
  32     case LASI_IRR:
  33     case LASI_IMR:
  34     case LASI_IPR:
  35     case LASI_ICR:
  36     case LASI_IAR:
  37
  38     case LASI_LPT:
  39     case LASI_UART:
  40     case LASI_LAN:
  41     case LASI_RTC:
  42
  43     case LASI_PCR ... LASI_AMR:
  44         ret = true;
  45     }
  46
  47     trace_lasi_chip_mem_valid(addr, ret);
  48     return ret;
  49 }
  50
  51 static MemTxResult lasi_chip_read_with_attrs(void *opaque, hwaddr addr,
  52                                              uint64_t *data, unsigned size,
  53                                              MemTxAttrs attrs)
  54 {
  55     LasiState *s = opaque;
  56     MemTxResult ret = MEMTX_OK;
  57     uint32_t val;
  58
  59     switch (addr) {
  60     case LASI_IRR:
  61         val = s->irr;
  62         break;
  63     case LASI_IMR:
  64         val = s->imr;
  65         break;
  66     case LASI_IPR:
  67         val = s->ipr;
  68         /* Any read to IPR clears the register.  */
  69         s->ipr = 0;
  70         break;
  71     case LASI_ICR:
  72         val = s->icr & ICR_BUS_ERROR_BIT; /* bus_error */
  73         break;
  74     case LASI_IAR:
  75         val = s->iar;
  76         break;
  77
  78     case LASI_LPT:
  79     case LASI_UART:
  80     case LASI_LAN:
  81         val = 0;
  82         break;
  83     case LASI_RTC:
  84         val = time(NULL);
  85         val += s->rtc_ref;
  86         break;
  87
  88     case LASI_PCR:
  89     case LASI_VER:      /* only version 0 existed. */
  90     case LASI_IORESET:
  91         val = 0;
  92         break;
  93     case LASI_ERRLOG:
  94         val = s->errlog;
  95         break;
  96     case LASI_AMR:
  97         val = s->amr;
  98         break;
  99
 100     default:
 101         /* Controlled by lasi_chip_mem_valid above. */
 102         g_assert_not_reached();
 103     }
 104
 105     trace_lasi_chip_read(addr, val);
 106
 107     *data = val;
 108     return ret;
 109 }
 110
 111 static MemTxResult lasi_chip_write_with_attrs(void *opaque, hwaddr addr,
 112                                               uint64_t val, unsigned size,
 113                                               MemTxAttrs attrs)
 114 {
 115     LasiState *s = opaque;
 116
 117     trace_lasi_chip_write(addr, val);
 118
 119     switch (addr) {
 120     case LASI_IRR:
 121         /* read-only.  */
 122         break;
 123     case LASI_IMR:
 124         s->imr = val;
 125         if (((val & LASI_IRQ_BITS) != val) && (val != 0xffffffff)) {
 126             qemu_log_mask(LOG_GUEST_ERROR,
 127                 "LASI: tried to set invalid %lx IMR value.\n",
 128                 (unsigned long) val);
 129         }
 130         break;
 131     case LASI_IPR:
 132         /* Any write to IPR clears the register. */
 133         s->ipr = 0;
 134         break;
 135     case LASI_ICR:
 136         s->icr = val;
 137         /* if (val & ICR_TOC_BIT) issue_toc(); */
 138         break;
 139     case LASI_IAR:
 140         s->iar = val;
 141         break;
 142
 143     case LASI_LPT:
 144         /* XXX: reset parallel port */
 145         break;
 146     case LASI_UART:
 147         /* XXX: reset serial port */
 148         break;
 149     case LASI_LAN:
 150         /* XXX: reset LAN card */
 151         break;
 152     case LASI_RTC:
 153         s->rtc_ref = val - time(NULL);
 154         break;
 155
 156     case LASI_PCR:
 157         if (val == 0x02) { /* immediately power off */
 158             qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 159         }
 160         break;
 161     case LASI_ERRLOG:
 162         s->errlog = val;
 163         break;
 164     case LASI_VER:
 165         /* read-only.  */
 166         break;
 167     case LASI_IORESET:
 168         break;  /* XXX: TODO: Reset various devices. */
 169     case LASI_AMR:
 170         s->amr = val;
 171         break;
 172
 173     default:
 174         /* Controlled by lasi_chip_mem_valid above. */
 175         g_assert_not_reached();
 176     }
 177     return MEMTX_OK;
 178 }
 179
 180 static const MemoryRegionOps lasi_chip_ops = {
 181     .read_with_attrs = lasi_chip_read_with_attrs,
 182     .write_with_attrs = lasi_chip_write_with_attrs,
 183     .endianness = DEVICE_BIG_ENDIAN,
 184     .valid = {
 185         .min_access_size = 1,
 186         .max_access_size = 4,
 187         .accepts = lasi_chip_mem_valid,
 188     },
 189     .impl = {
 190         .min_access_size = 1,
 191         .max_access_size = 4,
 192     },
 193 };
 194
 195 static const VMStateDescription vmstate_lasi = {
 196     .name = "Lasi",
 197     .version_id = 1,
 198     .minimum_version_id = 1,
 199     .fields = (VMStateField[]) {
 200         VMSTATE_UINT32(irr, LasiState),
 201         VMSTATE_UINT32(imr, LasiState),
 202         VMSTATE_UINT32(ipr, LasiState),
 203         VMSTATE_UINT32(icr, LasiState),
 204         VMSTATE_UINT32(iar, LasiState),
 205         VMSTATE_UINT32(errlog, LasiState),
 206         VMSTATE_UINT32(amr, LasiState),
 207         VMSTATE_END_OF_LIST()
 208     }
 209 };
 210
 211
 212 static void lasi_set_irq(void *opaque, int irq, int level)
 213 {
 214     LasiState *s = opaque;
 215     uint32_t bit = 1u << irq;
 216
 217     if (level) {
 218         s->ipr |= bit;
 219         if (bit & s->imr) {
 220             uint32_t iar = s->iar;
 221             s->irr |= bit;
 222             if ((s->icr & ICR_BUS_ERROR_BIT) == 0) {
 223                 stl_be_phys(&address_space_memory, iar & -32, iar & 31);
 224             }
 225         }
 226     }
 227 }
 228
 229 static void lasi_reset(DeviceState *dev)
 230 {
 231     LasiState *s = LASI_CHIP(dev);
 232
 233     s->iar = 0xFFFB0000 + 3; /* CPU_HPA + 3 */
 234
 235     /* Real time clock (RTC), it's only one 32-bit counter @9000 */
 236     s->rtc = time(NULL);
 237     s->rtc_ref = 0;
 238 }
 239
 240 static void lasi_init(Object *obj)
 241 {
 242     LasiState *s = LASI_CHIP(obj);
 243     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 244
 245     memory_region_init_io(&s->this_mem, OBJECT(s), &lasi_chip_ops,
 246                           s, "lasi", 0x100000);
 247
 248     sysbus_init_mmio(sbd, &s->this_mem);
 249
 250     qdev_init_gpio_in(DEVICE(obj), lasi_set_irq, LASI_IRQS);
 251 }
 252
 253 static void lasi_class_init(ObjectClass *klass, void *data)
 254 {
 255     DeviceClass *dc = DEVICE_CLASS(klass);
 256
 257     dc->reset = lasi_reset;
 258     dc->vmsd = &vmstate_lasi;
 259 }
 260
 261 static const TypeInfo lasi_pcihost_info = {
 262     .name          = TYPE_LASI_CHIP,
 263     .parent        = TYPE_SYS_BUS_DEVICE,
 264     .instance_init = lasi_init,
 265     .instance_size = sizeof(LasiState),
 266     .class_init    = lasi_class_init,
 267 };
 268
 269 static void lasi_register_types(void)
 270 {
 271     type_register_static(&lasi_pcihost_info);
 272 }
 273
 274 type_init(lasi_register_types)