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 2.1 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     return PNV_CHIP_GET_CLASS(chip)->xscom_pcba(chip, addr);
  61 }
  62
  63 static uint64_t xscom_read_default(PnvChip *chip, uint32_t pcba)
  64 {
  65     switch (pcba) {
  66     case 0xf000f:
  67         return PNV_CHIP_GET_CLASS(chip)->chip_cfam_id;
  68     case 0x18002:       /* ECID2 */
  69         return 0;
  70
  71     case 0x1010c00:     /* PIBAM FIR */
  72     case 0x1010c03:     /* PIBAM FIR MASK */
  73
  74         /* PRD registers */
  75     case PRD_P8_IPOLL_REG_MASK:
  76     case PRD_P8_IPOLL_REG_STATUS:
  77     case PRD_P9_IPOLL_REG_MASK:
  78     case PRD_P9_IPOLL_REG_STATUS:
  79
  80         /* P9 xscom reset */
  81     case 0x0090018:     /* Receive status reg */
  82     case 0x0090012:     /* log register */
  83     case 0x0090013:     /* error register */
  84
  85         /* P8 xscom reset */
  86     case 0x2020007:     /* ADU stuff, log register */
  87     case 0x2020009:     /* ADU stuff, error register */
  88     case 0x202000f:     /* ADU stuff, receive status register*/
  89         return 0;
  90     case 0x2013f01:     /* PBA stuff */
  91     case 0x2013f05:     /* PBA stuff */
  92         return 0;
  93     case 0x2013028:     /* CAPP stuff */
  94     case 0x201302a:     /* CAPP stuff */
  95     case 0x2013801:     /* CAPP stuff */
  96     case 0x2013802:     /* CAPP stuff */
  97
  98         /* P9 CAPP regs */
  99     case 0x2010841:
 100     case 0x2010842:
 101     case 0x201082a:
 102     case 0x2010828:
 103     case 0x4010841:
 104     case 0x4010842:
 105     case 0x401082a:
 106     case 0x4010828:
 107         return 0;
 108     default:
 109         return -1;
 110     }
 111 }
 112
 113 static bool xscom_write_default(PnvChip *chip, uint32_t pcba, uint64_t val)
 114 {
 115     /* We ignore writes to these */
 116     switch (pcba) {
 117     case 0xf000f:       /* chip id is RO */
 118     case 0x1010c00:     /* PIBAM FIR */
 119     case 0x1010c01:     /* PIBAM FIR */
 120     case 0x1010c02:     /* PIBAM FIR */
 121     case 0x1010c03:     /* PIBAM FIR MASK */
 122     case 0x1010c04:     /* PIBAM FIR MASK */
 123     case 0x1010c05:     /* PIBAM FIR MASK */
 124         /* P9 xscom reset */
 125     case 0x0090018:     /* Receive status reg */
 126     case 0x0090012:     /* log register */
 127     case 0x0090013:     /* error register */
 128
 129         /* P8 xscom reset */
 130     case 0x2020007:     /* ADU stuff, log register */
 131     case 0x2020009:     /* ADU stuff, error register */
 132     case 0x202000f:     /* ADU stuff, receive status register*/
 133
 134     case 0x2013028:     /* CAPP stuff */
 135     case 0x201302a:     /* CAPP stuff */
 136     case 0x2013801:     /* CAPP stuff */
 137     case 0x2013802:     /* CAPP stuff */
 138
 139         /* P9 CAPP regs */
 140     case 0x2010841:
 141     case 0x2010842:
 142     case 0x201082a:
 143     case 0x2010828:
 144     case 0x4010841:
 145     case 0x4010842:
 146     case 0x401082a:
 147     case 0x4010828:
 148
 149         /* P8 PRD registers */
 150     case PRD_P8_IPOLL_REG_MASK:
 151     case PRD_P8_IPOLL_REG_STATUS:
 152     case PRD_P9_IPOLL_REG_MASK:
 153     case PRD_P9_IPOLL_REG_STATUS:
 154         return true;
 155     default:
 156         return false;
 157     }
 158 }
 159
 160 static uint64_t xscom_read(void *opaque, hwaddr addr, unsigned width)
 161 {
 162     PnvChip *chip = opaque;
 163     uint32_t pcba = pnv_xscom_pcba(chip, addr);
 164     uint64_t val = 0;
 165     MemTxResult result;
 166
 167     /* Handle some SCOMs here before dispatch */
 168     val = xscom_read_default(chip, pcba);
 169     if (val != -1) {
 170         goto complete;
 171     }
 172
 173     val = address_space_ldq(&chip->xscom_as, (uint64_t) pcba << 3,
 174                             MEMTXATTRS_UNSPECIFIED, &result);
 175     if (result != MEMTX_OK) {
 176         qemu_log_mask(LOG_GUEST_ERROR, "XSCOM read failed at @0x%"
 177                       HWADDR_PRIx " pcba=0x%08x\n", addr, pcba);
 178         xscom_complete(current_cpu, HMER_XSCOM_FAIL | HMER_XSCOM_DONE);
 179         return 0;
 180     }
 181
 182 complete:
 183     xscom_complete(current_cpu, HMER_XSCOM_DONE);
 184     return val;
 185 }
 186
 187 static void xscom_write(void *opaque, hwaddr addr, uint64_t val,
 188                         unsigned width)
 189 {
 190     PnvChip *chip = opaque;
 191     uint32_t pcba = pnv_xscom_pcba(chip, addr);
 192     MemTxResult result;
 193
 194     /* Handle some SCOMs here before dispatch */
 195     if (xscom_write_default(chip, pcba, val)) {
 196         goto complete;
 197     }
 198
 199     address_space_stq(&chip->xscom_as, (uint64_t) pcba << 3, val,
 200                       MEMTXATTRS_UNSPECIFIED, &result);
 201     if (result != MEMTX_OK) {
 202         qemu_log_mask(LOG_GUEST_ERROR, "XSCOM write failed at @0x%"
 203                       HWADDR_PRIx " pcba=0x%08x data=0x%" PRIx64 "\n",
 204                       addr, pcba, val);
 205         xscom_complete(current_cpu, HMER_XSCOM_FAIL | HMER_XSCOM_DONE);
 206         return;
 207     }
 208
 209 complete:
 210     xscom_complete(current_cpu, HMER_XSCOM_DONE);
 211 }
 212
 213 const MemoryRegionOps pnv_xscom_ops = {
 214     .read = xscom_read,
 215     .write = xscom_write,
 216     .valid.min_access_size = 8,
 217     .valid.max_access_size = 8,
 218     .impl.min_access_size = 8,
 219     .impl.max_access_size = 8,
 220     .endianness = DEVICE_BIG_ENDIAN,
 221 };
 222
 223 void pnv_xscom_realize(PnvChip *chip, uint64_t size, Error **errp)
 224 {
 225     SysBusDevice *sbd = SYS_BUS_DEVICE(chip);
 226     char *name;
 227
 228     name = g_strdup_printf("xscom-%x", chip->chip_id);
 229     memory_region_init_io(&chip->xscom_mmio, OBJECT(chip), &pnv_xscom_ops,
 230                           chip, name, size);
 231     sysbus_init_mmio(sbd, &chip->xscom_mmio);
 232
 233     memory_region_init(&chip->xscom, OBJECT(chip), name, size);
 234     address_space_init(&chip->xscom_as, &chip->xscom, name);
 235     g_free(name);
 236 }
 237
 238 static const TypeInfo pnv_xscom_interface_info = {
 239     .name = TYPE_PNV_XSCOM_INTERFACE,
 240     .parent = TYPE_INTERFACE,
 241     .class_size = sizeof(PnvXScomInterfaceClass),
 242 };
 243
 244 static void pnv_xscom_register_types(void)
 245 {
 246     type_register_static(&pnv_xscom_interface_info);
 247 }
 248
 249 type_init(pnv_xscom_register_types)
 250
 251 typedef struct ForeachPopulateArgs {
 252     void *fdt;
 253     int xscom_offset;
 254 } ForeachPopulateArgs;
 255
 256 static int xscom_dt_child(Object *child, void *opaque)
 257 {
 258     if (object_dynamic_cast(child, TYPE_PNV_XSCOM_INTERFACE)) {
 259         ForeachPopulateArgs *args = opaque;
 260         PnvXScomInterface *xd = PNV_XSCOM_INTERFACE(child);
 261         PnvXScomInterfaceClass *xc = PNV_XSCOM_INTERFACE_GET_CLASS(xd);
 262
 263         /*
 264          * Only "realized" devices should be configured in the DT
 265          */
 266         if (xc->dt_xscom && DEVICE(child)->realized) {
 267             _FDT((xc->dt_xscom(xd, args->fdt, args->xscom_offset)));
 268         }
 269     }
 270     return 0;
 271 }
 272
 273 int pnv_dt_xscom(PnvChip *chip, void *fdt, int root_offset,
 274                  uint64_t xscom_base, uint64_t xscom_size,
 275                  const char *compat, int compat_size)
 276 {
 277     uint64_t reg[] = { xscom_base, xscom_size };
 278     int xscom_offset;
 279     ForeachPopulateArgs args;
 280     char *name;
 281
 282     name = g_strdup_printf("xscom@%" PRIx64, be64_to_cpu(reg[0]));
 283     xscom_offset = fdt_add_subnode(fdt, root_offset, name);
 284     _FDT(xscom_offset);
 285     g_free(name);
 286     _FDT((fdt_setprop_cell(fdt, xscom_offset, "ibm,chip-id", chip->chip_id)));
 287     /*
 288      * On P10, the xscom bus id has been deprecated and the chip id is
 289      * calculated from the "Primary topology table index". See skiboot.
 290      */
 291     _FDT((fdt_setprop_cell(fdt, xscom_offset, "ibm,primary-topology-index",
 292                            chip->chip_id)));
 293     _FDT((fdt_setprop_cell(fdt, xscom_offset, "#address-cells", 1)));
 294     _FDT((fdt_setprop_cell(fdt, xscom_offset, "#size-cells", 1)));
 295     _FDT((fdt_setprop(fdt, xscom_offset, "reg", reg, sizeof(reg))));
 296     _FDT((fdt_setprop(fdt, xscom_offset, "compatible", compat, compat_size)));
 297     _FDT((fdt_setprop(fdt, xscom_offset, "scom-controller", NULL, 0)));
 298
 299     args.fdt = fdt;
 300     args.xscom_offset = xscom_offset;
 301
 302     /*
 303      * Loop on the whole object hierarchy to catch all
 304      * PnvXScomInterface objects which can lie a bit deeper than the
 305      * first layer.
 306      */
 307     object_child_foreach_recursive(OBJECT(chip), xscom_dt_child, &args);
 308     return 0;
 309 }
 310
 311 void pnv_xscom_add_subregion(PnvChip *chip, hwaddr offset, MemoryRegion *mr)
 312 {
 313     memory_region_add_subregion(&chip->xscom, offset << 3, mr);
 314 }
 315
 316 void pnv_xscom_region_init(MemoryRegion *mr,
 317                            Object *owner,
 318                            const MemoryRegionOps *ops,
 319                            void *opaque,
 320                            const char *name,
 321                            uint64_t size)
 322 {
 323     memory_region_init_io(mr, owner, ops, opaque, name, size << 3);
 324 }