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 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 _FDT((fdt_setprop_cell(fdt, xscom_offset, "#address-cells", 1))); 288 _FDT((fdt_setprop_cell(fdt, xscom_offset, "#size-cells", 1))); 289 _FDT((fdt_setprop(fdt, xscom_offset, "reg", reg, sizeof(reg)))); 290 _FDT((fdt_setprop(fdt, xscom_offset, "compatible", compat, compat_size))); 291 _FDT((fdt_setprop(fdt, xscom_offset, "scom-controller", NULL, 0))); 292 293 args.fdt = fdt; 294 args.xscom_offset = xscom_offset; 295 296 /* 297 * Loop on the whole object hierarchy to catch all 298 * PnvXScomInterface objects which can lie a bit deeper than the 299 * first layer. 300 */ 301 object_child_foreach_recursive(OBJECT(chip), xscom_dt_child, &args); 302 return 0; 303 } 304 305 void pnv_xscom_add_subregion(PnvChip *chip, hwaddr offset, MemoryRegion *mr) 306 { 307 memory_region_add_subregion(&chip->xscom, offset << 3, mr); 308 } 309 310 void pnv_xscom_region_init(MemoryRegion *mr, 311 struct Object *owner, 312 const MemoryRegionOps *ops, 313 void *opaque, 314 const char *name, 315 uint64_t size) 316 { 317 memory_region_init_io(mr, owner, ops, opaque, name, size << 3); 318 } 319