hw/ppc/prep_systemio.c

   1 /*
   2  * QEMU PReP System I/O emulation
   3  *
   4  * Copyright (c) 2017 Hervé Poussineau
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "qemu/log.h"
  27 #include "hw/irq.h"
  28 #include "hw/isa/isa.h"
  29 #include "hw/qdev-properties.h"
  30 #include "migration/vmstate.h"
  31 #include "exec/address-spaces.h"
  32 #include "qom/object.h"
  33 #include "qemu/error-report.h" /* for error_report() */
  34 #include "qemu/module.h"
  35 #include "sysemu/runstate.h"
  36 #include "cpu.h"
  37 #include "trace.h"
  38
  39 #define TYPE_PREP_SYSTEMIO "prep-systemio"
  40 OBJECT_DECLARE_SIMPLE_TYPE(PrepSystemIoState, PREP_SYSTEMIO)
  41
  42 /* Bit as defined in PowerPC Reference Platform v1.1, sect. 6.1.5, p. 132 */
  43 #define PREP_BIT(n) (1 << (7 - (n)))
  44
  45 struct PrepSystemIoState {
  46     ISADevice parent_obj;
  47     MemoryRegion ppc_parity_mem;
  48
  49     qemu_irq non_contiguous_io_map_irq;
  50     uint8_t sreset; /* 0x0092 */
  51     uint8_t equipment; /* 0x080c */
  52     uint8_t system_control; /* 0x081c */
  53     uint8_t iomap_type; /* 0x0850 */
  54     uint8_t ibm_planar_id; /* 0x0852 */
  55     qemu_irq softreset_irq;
  56     PortioList portio;
  57 };
  58
  59 /* PORT 0092 -- Special Port 92 (Read/Write) */
  60
  61 enum {
  62     PORT0092_SOFTRESET  = PREP_BIT(7),
  63     PORT0092_LE_MODE    = PREP_BIT(6),
  64 };
  65
  66 static void prep_port0092_write(void *opaque, uint32_t addr, uint32_t val)
  67 {
  68     PrepSystemIoState *s = opaque;
  69
  70     trace_prep_systemio_write(addr, val);
  71
  72     s->sreset = val & PORT0092_SOFTRESET;
  73     qemu_set_irq(s->softreset_irq, s->sreset);
  74
  75     if ((val & PORT0092_LE_MODE) != 0) {
  76         /* XXX Not supported yet */
  77         error_report("little-endian mode not supported");
  78         vm_stop(RUN_STATE_PAUSED);
  79     } else {
  80         /* Nothing to do */
  81     }
  82 }
  83
  84 static uint32_t prep_port0092_read(void *opaque, uint32_t addr)
  85 {
  86     PrepSystemIoState *s = opaque;
  87     trace_prep_systemio_read(addr, s->sreset);
  88     return s->sreset;
  89 }
  90
  91 /* PORT 0808 -- Hardfile Light Register (Write Only) */
  92
  93 enum {
  94     PORT0808_HARDFILE_LIGHT_ON  = PREP_BIT(7),
  95 };
  96
  97 static void prep_port0808_write(void *opaque, uint32_t addr, uint32_t val)
  98 {
  99     trace_prep_systemio_write(addr, val);
 100 }
 101
 102 /* PORT 0810 -- Password Protect 1 Register (Write Only) */
 103
 104 /* reset by port 0x4D in the SIO */
 105 static void prep_port0810_write(void *opaque, uint32_t addr, uint32_t val)
 106 {
 107     trace_prep_systemio_write(addr, val);
 108 }
 109
 110 /* PORT 0812 -- Password Protect 2 Register (Write Only) */
 111
 112 /* reset by port 0x4D in the SIO */
 113 static void prep_port0812_write(void *opaque, uint32_t addr, uint32_t val)
 114 {
 115     trace_prep_systemio_write(addr, val);
 116 }
 117
 118 /* PORT 0814 -- L2 Invalidate Register (Write Only) */
 119
 120 static void prep_port0814_write(void *opaque, uint32_t addr, uint32_t val)
 121 {
 122     trace_prep_systemio_write(addr, val);
 123 }
 124
 125 /* PORT 0818 -- Reserved for Keylock (Read Only) */
 126
 127 enum {
 128     PORT0818_KEYLOCK_SIGNAL_HIGH    = PREP_BIT(7),
 129 };
 130
 131 static uint32_t prep_port0818_read(void *opaque, uint32_t addr)
 132 {
 133     uint32_t val = 0;
 134     trace_prep_systemio_read(addr, val);
 135     return val;
 136 }
 137
 138 /* PORT 080C -- Equipment */
 139
 140 enum {
 141     PORT080C_SCSIFUSE               = PREP_BIT(1),
 142     PORT080C_L2_COPYBACK            = PREP_BIT(4),
 143     PORT080C_L2_256                 = PREP_BIT(5),
 144     PORT080C_UPGRADE_CPU            = PREP_BIT(6),
 145     PORT080C_L2                     = PREP_BIT(7),
 146 };
 147
 148 static uint32_t prep_port080c_read(void *opaque, uint32_t addr)
 149 {
 150     PrepSystemIoState *s = opaque;
 151     trace_prep_systemio_read(addr, s->equipment);
 152     return s->equipment;
 153 }
 154
 155 /* PORT 081C -- System Control Register (Read/Write) */
 156
 157 enum {
 158     PORT081C_FLOPPY_MOTOR_INHIBIT   = PREP_BIT(3),
 159     PORT081C_MASK_TEA               = PREP_BIT(2),
 160     PORT081C_L2_UPDATE_INHIBIT      = PREP_BIT(1),
 161     PORT081C_L2_CACHEMISS_INHIBIT   = PREP_BIT(0),
 162 };
 163
 164 static void prep_port081c_write(void *opaque, uint32_t addr, uint32_t val)
 165 {
 166     static const uint8_t mask = PORT081C_FLOPPY_MOTOR_INHIBIT |
 167                                 PORT081C_MASK_TEA |
 168                                 PORT081C_L2_UPDATE_INHIBIT |
 169                                 PORT081C_L2_CACHEMISS_INHIBIT;
 170     PrepSystemIoState *s = opaque;
 171     trace_prep_systemio_write(addr, val);
 172     s->system_control = val & mask;
 173 }
 174
 175 static uint32_t prep_port081c_read(void *opaque, uint32_t addr)
 176 {
 177     PrepSystemIoState *s = opaque;
 178     trace_prep_systemio_read(addr, s->system_control);
 179     return s->system_control;
 180 }
 181
 182 /* System Board Identification */
 183
 184 static uint32_t prep_port0852_read(void *opaque, uint32_t addr)
 185 {
 186     PrepSystemIoState *s = opaque;
 187     trace_prep_systemio_read(addr, s->ibm_planar_id);
 188     return s->ibm_planar_id;
 189 }
 190
 191 /* PORT 0850 -- I/O Map Type Register (Read/Write) */
 192
 193 enum {
 194     PORT0850_IOMAP_NONCONTIGUOUS    = PREP_BIT(7),
 195 };
 196
 197 static uint32_t prep_port0850_read(void *opaque, uint32_t addr)
 198 {
 199     PrepSystemIoState *s = opaque;
 200     trace_prep_systemio_read(addr, s->iomap_type);
 201     return s->iomap_type;
 202 }
 203
 204 static void prep_port0850_write(void *opaque, uint32_t addr, uint32_t val)
 205 {
 206     PrepSystemIoState *s = opaque;
 207
 208     trace_prep_systemio_write(addr, val);
 209     qemu_set_irq(s->non_contiguous_io_map_irq,
 210                  val & PORT0850_IOMAP_NONCONTIGUOUS);
 211     s->iomap_type = val & PORT0850_IOMAP_NONCONTIGUOUS;
 212 }
 213
 214 static const MemoryRegionPortio ppc_io800_port_list[] = {
 215     { 0x092, 1, 1, .read = prep_port0092_read,
 216                    .write = prep_port0092_write, },
 217     { 0x808, 1, 1, .write = prep_port0808_write, },
 218     { 0x80c, 1, 1, .read = prep_port080c_read, },
 219     { 0x810, 1, 1, .write = prep_port0810_write, },
 220     { 0x812, 1, 1, .write = prep_port0812_write, },
 221     { 0x814, 1, 1, .write = prep_port0814_write, },
 222     { 0x818, 1, 1, .read = prep_port0818_read },
 223     { 0x81c, 1, 1, .read = prep_port081c_read,
 224                    .write = prep_port081c_write, },
 225     { 0x850, 1, 1, .read = prep_port0850_read,
 226                    .write = prep_port0850_write, },
 227     { 0x852, 1, 1, .read = prep_port0852_read, },
 228     PORTIO_END_OF_LIST()
 229 };
 230
 231 static uint64_t ppc_parity_error_readl(void *opaque, hwaddr addr,
 232                                        unsigned int size)
 233 {
 234     uint32_t val = 0;
 235     trace_prep_systemio_read((unsigned int)addr, val);
 236     return val;
 237 }
 238
 239 static void ppc_parity_error_writel(void *opaque, hwaddr addr,
 240                                     uint64_t data, unsigned size)
 241 {
 242     qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid access\n", __func__);
 243 }
 244
 245 static const MemoryRegionOps ppc_parity_error_ops = {
 246     .read = ppc_parity_error_readl,
 247     .write = ppc_parity_error_writel,
 248     .valid = {
 249         .min_access_size = 4,
 250         .max_access_size = 4,
 251     },
 252 };
 253
 254 static void prep_systemio_realize(DeviceState *dev, Error **errp)
 255 {
 256     ISADevice *isa = ISA_DEVICE(dev);
 257     PrepSystemIoState *s = PREP_SYSTEMIO(dev);
 258     PowerPCCPU *cpu;
 259
 260     qdev_init_gpio_out(dev, &s->non_contiguous_io_map_irq, 1);
 261     s->iomap_type = PORT0850_IOMAP_NONCONTIGUOUS;
 262     qemu_set_irq(s->non_contiguous_io_map_irq,
 263                  s->iomap_type & PORT0850_IOMAP_NONCONTIGUOUS);
 264     cpu = POWERPC_CPU(first_cpu);
 265     s->softreset_irq = qdev_get_gpio_in(DEVICE(cpu), PPC6xx_INPUT_HRESET);
 266
 267     isa_register_portio_list(isa, &s->portio, 0x0, ppc_io800_port_list, s,
 268                              "systemio800");
 269
 270     memory_region_init_io(&s->ppc_parity_mem, OBJECT(dev),
 271                           &ppc_parity_error_ops, s, "ppc-parity", 0x4);
 272     memory_region_add_subregion(get_system_memory(), 0xbfffeff0,
 273                                 &s->ppc_parity_mem);
 274 }
 275
 276 static const VMStateDescription vmstate_prep_systemio = {
 277     .name = "prep_systemio",
 278     .version_id = 1,
 279     .minimum_version_id = 1,
 280     .fields = (VMStateField[]) {
 281         VMSTATE_UINT8(sreset, PrepSystemIoState),
 282         VMSTATE_UINT8(system_control, PrepSystemIoState),
 283         VMSTATE_UINT8(iomap_type, PrepSystemIoState),
 284         VMSTATE_END_OF_LIST()
 285     },
 286 };
 287
 288 static Property prep_systemio_properties[] = {
 289     DEFINE_PROP_UINT8("ibm-planar-id", PrepSystemIoState, ibm_planar_id, 0),
 290     DEFINE_PROP_UINT8("equipment", PrepSystemIoState, equipment, 0),
 291     DEFINE_PROP_END_OF_LIST()
 292 };
 293
 294 static void prep_systemio_class_initfn(ObjectClass *klass, void *data)
 295 {
 296     DeviceClass *dc = DEVICE_CLASS(klass);
 297
 298     dc->realize = prep_systemio_realize;
 299     dc->vmsd = &vmstate_prep_systemio;
 300     device_class_set_props(dc, prep_systemio_properties);
 301 }
 302
 303 static const TypeInfo prep_systemio800_info = {
 304     .name          = TYPE_PREP_SYSTEMIO,
 305     .parent        = TYPE_ISA_DEVICE,
 306     .instance_size = sizeof(PrepSystemIoState),
 307     .class_init    = prep_systemio_class_initfn,
 308 };
 309
 310 static void prep_systemio_register_types(void)
 311 {
 312     type_register_static(&prep_systemio800_info);
 313 }
 314
 315 type_init(prep_systemio_register_types)