hw/ppc/pnv_xscom.c

   1 /*
   2  * QEMU PowerPC PowerNV XSCOM bus
   3  *
   4  * Copyright (c) 2016, IBM Corporation.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qemu/log.h"
  22 #include "qemu/module.h"
  23 #include "sysemu/hw_accel.h"
  24 #include "target/ppc/cpu.h"
  25 #include "hw/sysbus.h"
  26
  27 #include "hw/ppc/fdt.h"
  28 #include "hw/ppc/pnv.h"
  29 #include "hw/ppc/pnv_xscom.h"
  30
  31 #include <libfdt.h>
  32
  33 /* PRD registers */
  34 #define PRD_P8_IPOLL_REG_MASK           0x01020013
  35 #define PRD_P8_IPOLL_REG_STATUS         0x01020014
  36 #define PRD_P9_IPOLL_REG_MASK           0x000F0033
  37 #define PRD_P9_IPOLL_REG_STATUS         0x000F0034
  38
  39 static void xscom_complete(CPUState *cs, uint64_t hmer_bits)
  40 {
  41     /*
  42      * TODO: When the read/write comes from the monitor, NULL is
  43      * passed for the cpu, and no CPU completion is generated.
  44      */
  45     if (cs) {
  46         PowerPCCPU *cpu = POWERPC_CPU(cs);
  47         CPUPPCState *env = &cpu->env;
  48
  49         /*
  50          * TODO: Need a CPU helper to set HMER, also handle generation
  51          * of HMIs
  52          */
  53         cpu_synchronize_state(cs);
  54         env->spr[SPR_HMER] |= hmer_bits;
  55     }
  56 }
  57
  58 static uint32_t pnv_xscom_pcba(PnvChip *chip, uint64_t addr)
  59 {
  60     addr &= (PNV_XSCOM_SIZE - 1);
  61
  62     if (pnv_chip_is_power9(chip)) {
  63         return addr >> 3;
  64     } else {
  65         return ((addr >> 4) & ~0xfull) | ((addr >> 3) & 0xf);
  66     }
  67 }
  68
  69 static uint64_t xscom_read_default(PnvChip *chip, uint32_t pcba)
  70 {
  71     switch (pcba) {
  72     case 0xf000f:
  73         return PNV_CHIP_GET_CLASS(chip)->chip_cfam_id;
  74     case 0x18002:       /* ECID2 */
  75         return 0;
  76
  77     case 0x1010c00:     /* PIBAM FIR */
  78     case 0x1010c03:     /* PIBAM FIR MASK */
  79
  80         /* PRD registers */
  81     case PRD_P8_IPOLL_REG_MASK:
  82     case PRD_P8_IPOLL_REG_STATUS:
  83     case PRD_P9_IPOLL_REG_MASK:
  84     case PRD_P9_IPOLL_REG_STATUS:
  85
  86         /* P9 xscom reset */
  87     case 0x0090018:     /* Receive status reg */
  88     case 0x0090012:     /* log register */
  89     case 0x0090013:     /* error register */
  90
  91         /* P8 xscom reset */
  92     case 0x2020007:     /* ADU stuff, log register */
  93     case 0x2020009:     /* ADU stuff, error register */
  94     case 0x202000f:     /* ADU stuff, receive status register*/
  95         return 0;
  96     case 0x2013f00:     /* PBA stuff */
  97     case 0x2013f01:     /* PBA stuff */
  98     case 0x2013f02:     /* PBA stuff */
  99     case 0x2013f03:     /* PBA stuff */
 100     case 0x2013f04:     /* PBA stuff */
 101     case 0x2013f05:     /* PBA stuff */
 102     case 0x2013f06:     /* PBA stuff */
 103     case 0x2013f07:     /* PBA stuff */
 104         return 0;
 105     case 0x2013028:     /* CAPP stuff */
 106     case 0x201302a:     /* CAPP stuff */
 107     case 0x2013801:     /* CAPP stuff */
 108     case 0x2013802:     /* CAPP stuff */
 109
 110         /* P9 CAPP regs */
 111     case 0x2010841:
 112     case 0x2010842:
 113     case 0x201082a:
 114     case 0x2010828:
 115     case 0x4010841:
 116     case 0x4010842:
 117     case 0x401082a:
 118     case 0x4010828:
 119         return 0;
 120     default:
 121         return -1;
 122     }
 123 }
 124
 125 static bool xscom_write_default(PnvChip *chip, uint32_t pcba, uint64_t val)
 126 {
 127     /* We ignore writes to these */
 128     switch (pcba) {
 129     case 0xf000f:       /* chip id is RO */
 130     case 0x1010c00:     /* PIBAM FIR */
 131     case 0x1010c01:     /* PIBAM FIR */
 132     case 0x1010c02:     /* PIBAM FIR */
 133     case 0x1010c03:     /* PIBAM FIR MASK */
 134     case 0x1010c04:     /* PIBAM FIR MASK */
 135     case 0x1010c05:     /* PIBAM FIR MASK */
 136         /* P9 xscom reset */
 137     case 0x0090018:     /* Receive status reg */
 138     case 0x0090012:     /* log register */
 139     case 0x0090013:     /* error register */
 140
 141         /* P8 xscom reset */
 142     case 0x2020007:     /* ADU stuff, log register */
 143     case 0x2020009:     /* ADU stuff, error register */
 144     case 0x202000f:     /* ADU stuff, receive status register*/
 145
 146     case 0x2013028:     /* CAPP stuff */
 147     case 0x201302a:     /* CAPP stuff */
 148     case 0x2013801:     /* CAPP stuff */
 149     case 0x2013802:     /* CAPP stuff */
 150
 151         /* P9 CAPP regs */
 152     case 0x2010841:
 153     case 0x2010842:
 154     case 0x201082a:
 155     case 0x2010828:
 156     case 0x4010841:
 157     case 0x4010842:
 158     case 0x401082a:
 159     case 0x4010828:
 160
 161         /* P8 PRD registers */
 162     case PRD_P8_IPOLL_REG_MASK:
 163     case PRD_P8_IPOLL_REG_STATUS:
 164     case PRD_P9_IPOLL_REG_MASK:
 165     case PRD_P9_IPOLL_REG_STATUS:
 166         return true;
 167     default:
 168         return false;
 169     }
 170 }
 171
 172 static uint64_t xscom_read(void *opaque, hwaddr addr, unsigned width)
 173 {
 174     PnvChip *chip = opaque;
 175     uint32_t pcba = pnv_xscom_pcba(chip, addr);
 176     uint64_t val = 0;
 177     MemTxResult result;
 178
 179     /* Handle some SCOMs here before dispatch */
 180     val = xscom_read_default(chip, pcba);
 181     if (val != -1) {
 182         goto complete;
 183     }
 184
 185     val = address_space_ldq(&chip->xscom_as, (uint64_t) pcba << 3,
 186                             MEMTXATTRS_UNSPECIFIED, &result);
 187     if (result != MEMTX_OK) {
 188         qemu_log_mask(LOG_GUEST_ERROR, "XSCOM read failed at @0x%"
 189                       HWADDR_PRIx " pcba=0x%08x\n", addr, pcba);
 190         xscom_complete(current_cpu, HMER_XSCOM_FAIL | HMER_XSCOM_DONE);
 191         return 0;
 192     }
 193
 194 complete:
 195     xscom_complete(current_cpu, HMER_XSCOM_DONE);
 196     return val;
 197 }
 198
 199 static void xscom_write(void *opaque, hwaddr addr, uint64_t val,
 200                         unsigned width)
 201 {
 202     PnvChip *chip = opaque;
 203     uint32_t pcba = pnv_xscom_pcba(chip, addr);
 204     MemTxResult result;
 205
 206     /* Handle some SCOMs here before dispatch */
 207     if (xscom_write_default(chip, pcba, val)) {
 208         goto complete;
 209     }
 210
 211     address_space_stq(&chip->xscom_as, (uint64_t) pcba << 3, val,
 212                       MEMTXATTRS_UNSPECIFIED, &result);
 213     if (result != MEMTX_OK) {
 214         qemu_log_mask(LOG_GUEST_ERROR, "XSCOM write failed at @0x%"
 215                       HWADDR_PRIx " pcba=0x%08x data=0x%" PRIx64 "\n",
 216                       addr, pcba, val);
 217         xscom_complete(current_cpu, HMER_XSCOM_FAIL | HMER_XSCOM_DONE);
 218         return;
 219     }
 220
 221 complete:
 222     xscom_complete(current_cpu, HMER_XSCOM_DONE);
 223 }
 224
 225 const MemoryRegionOps pnv_xscom_ops = {
 226     .read = xscom_read,
 227     .write = xscom_write,
 228     .valid.min_access_size = 8,
 229     .valid.max_access_size = 8,
 230     .impl.min_access_size = 8,
 231     .impl.max_access_size = 8,
 232     .endianness = DEVICE_BIG_ENDIAN,
 233 };
 234
 235 void pnv_xscom_realize(PnvChip *chip, uint64_t size, Error **errp)
 236 {
 237     SysBusDevice *sbd = SYS_BUS_DEVICE(chip);
 238     char *name;
 239
 240     name = g_strdup_printf("xscom-%x", chip->chip_id);
 241     memory_region_init_io(&chip->xscom_mmio, OBJECT(chip), &pnv_xscom_ops,
 242                           chip, name, size);
 243     sysbus_init_mmio(sbd, &chip->xscom_mmio);
 244
 245     memory_region_init(&chip->xscom, OBJECT(chip), name, size);
 246     address_space_init(&chip->xscom_as, &chip->xscom, name);
 247     g_free(name);
 248 }
 249
 250 static const TypeInfo pnv_xscom_interface_info = {
 251     .name = TYPE_PNV_XSCOM_INTERFACE,
 252     .parent = TYPE_INTERFACE,
 253     .class_size = sizeof(PnvXScomInterfaceClass),
 254 };
 255
 256 static void pnv_xscom_register_types(void)
 257 {
 258     type_register_static(&pnv_xscom_interface_info);
 259 }
 260
 261 type_init(pnv_xscom_register_types)
 262
 263 typedef struct ForeachPopulateArgs {
 264     void *fdt;
 265     int xscom_offset;
 266 } ForeachPopulateArgs;
 267
 268 static int xscom_dt_child(Object *child, void *opaque)
 269 {
 270     if (object_dynamic_cast(child, TYPE_PNV_XSCOM_INTERFACE)) {
 271         ForeachPopulateArgs *args = opaque;
 272         PnvXScomInterface *xd = PNV_XSCOM_INTERFACE(child);
 273         PnvXScomInterfaceClass *xc = PNV_XSCOM_INTERFACE_GET_CLASS(xd);
 274
 275         if (xc->dt_xscom) {
 276             _FDT((xc->dt_xscom(xd, args->fdt, args->xscom_offset)));
 277         }
 278     }
 279     return 0;
 280 }
 281
 282 static const char compat_p8[] = "ibm,power8-xscom\0ibm,xscom";
 283 static const char compat_p9[] = "ibm,power9-xscom\0ibm,xscom";
 284
 285 int pnv_dt_xscom(PnvChip *chip, void *fdt, int root_offset)
 286 {
 287     uint64_t reg[2];
 288     int xscom_offset;
 289     ForeachPopulateArgs args;
 290     char *name;
 291
 292     if (pnv_chip_is_power9(chip)) {
 293         reg[0] = cpu_to_be64(PNV9_XSCOM_BASE(chip));
 294         reg[1] = cpu_to_be64(PNV9_XSCOM_SIZE);
 295     } else {
 296         reg[0] = cpu_to_be64(PNV_XSCOM_BASE(chip));
 297         reg[1] = cpu_to_be64(PNV_XSCOM_SIZE);
 298     }
 299
 300     name = g_strdup_printf("xscom@%" PRIx64, be64_to_cpu(reg[0]));
 301     xscom_offset = fdt_add_subnode(fdt, root_offset, name);
 302     _FDT(xscom_offset);
 303     g_free(name);
 304     _FDT((fdt_setprop_cell(fdt, xscom_offset, "ibm,chip-id", chip->chip_id)));
 305     _FDT((fdt_setprop_cell(fdt, xscom_offset, "#address-cells", 1)));
 306     _FDT((fdt_setprop_cell(fdt, xscom_offset, "#size-cells", 1)));
 307     _FDT((fdt_setprop(fdt, xscom_offset, "reg", reg, sizeof(reg))));
 308
 309     if (pnv_chip_is_power9(chip)) {
 310         _FDT((fdt_setprop(fdt, xscom_offset, "compatible", compat_p9,
 311                           sizeof(compat_p9))));
 312     } else {
 313         _FDT((fdt_setprop(fdt, xscom_offset, "compatible", compat_p8,
 314                           sizeof(compat_p8))));
 315     }
 316
 317     _FDT((fdt_setprop(fdt, xscom_offset, "scom-controller", NULL, 0)));
 318
 319     args.fdt = fdt;
 320     args.xscom_offset = xscom_offset;
 321
 322     object_child_foreach(OBJECT(chip), xscom_dt_child, &args);
 323     return 0;
 324 }
 325
 326 void pnv_xscom_add_subregion(PnvChip *chip, hwaddr offset, MemoryRegion *mr)
 327 {
 328     memory_region_add_subregion(&chip->xscom, offset << 3, mr);
 329 }
 330
 331 void pnv_xscom_region_init(MemoryRegion *mr,
 332                            struct Object *owner,
 333                            const MemoryRegionOps *ops,
 334                            void *opaque,
 335                            const char *name,
 336                            uint64_t size)
 337 {
 338     memory_region_init_io(mr, owner, ops, opaque, name, size << 3);
 339 }