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 "hw/hw.h" 22 #include "qemu/log.h" 23 #include "qemu/module.h" 24 #include "sysemu/hw_accel.h" 25 #include "target/ppc/cpu.h" 26 #include "hw/sysbus.h" 27 28 #include "hw/ppc/fdt.h" 29 #include "hw/ppc/pnv.h" 30 #include "hw/ppc/pnv_xscom.h" 31 32 #include <libfdt.h> 33 34 /* PRD registers */ 35 #define PRD_P8_IPOLL_REG_MASK 0x01020013 36 #define PRD_P8_IPOLL_REG_STATUS 0x01020014 37 #define PRD_P9_IPOLL_REG_MASK 0x000F0033 38 #define PRD_P9_IPOLL_REG_STATUS 0x000F0034 39 40 static void xscom_complete(CPUState *cs, uint64_t hmer_bits) 41 { 42 /* 43 * TODO: When the read/write comes from the monitor, NULL is 44 * passed for the cpu, and no CPU completion is generated. 45 */ 46 if (cs) { 47 PowerPCCPU *cpu = POWERPC_CPU(cs); 48 CPUPPCState *env = &cpu->env; 49 50 /* 51 * TODO: Need a CPU helper to set HMER, also handle generation 52 * of HMIs 53 */ 54 cpu_synchronize_state(cs); 55 env->spr[SPR_HMER] |= hmer_bits; 56 } 57 } 58 59 static uint32_t pnv_xscom_pcba(PnvChip *chip, uint64_t addr) 60 { 61 addr &= (PNV_XSCOM_SIZE - 1); 62 63 if (pnv_chip_is_power9(chip)) { 64 return addr >> 3; 65 } else { 66 return ((addr >> 4) & ~0xfull) | ((addr >> 3) & 0xf); 67 } 68 } 69 70 static uint64_t xscom_read_default(PnvChip *chip, uint32_t pcba) 71 { 72 switch (pcba) { 73 case 0xf000f: 74 return PNV_CHIP_GET_CLASS(chip)->chip_cfam_id; 75 case 0x18002: /* ECID2 */ 76 return 0; 77 78 case 0x1010c00: /* PIBAM FIR */ 79 case 0x1010c03: /* PIBAM FIR MASK */ 80 81 /* PRD registers */ 82 case PRD_P8_IPOLL_REG_MASK: 83 case PRD_P8_IPOLL_REG_STATUS: 84 case PRD_P9_IPOLL_REG_MASK: 85 case PRD_P9_IPOLL_REG_STATUS: 86 87 /* P9 xscom reset */ 88 case 0x0090018: /* Receive status reg */ 89 case 0x0090012: /* log register */ 90 case 0x0090013: /* error register */ 91 92 /* P8 xscom reset */ 93 case 0x2020007: /* ADU stuff, log register */ 94 case 0x2020009: /* ADU stuff, error register */ 95 case 0x202000f: /* ADU stuff, receive status register*/ 96 return 0; 97 case 0x2013f00: /* PBA stuff */ 98 case 0x2013f01: /* PBA stuff */ 99 case 0x2013f02: /* PBA stuff */ 100 case 0x2013f03: /* PBA stuff */ 101 case 0x2013f04: /* PBA stuff */ 102 case 0x2013f05: /* PBA stuff */ 103 case 0x2013f06: /* PBA stuff */ 104 case 0x2013f07: /* PBA stuff */ 105 return 0; 106 case 0x2013028: /* CAPP stuff */ 107 case 0x201302a: /* CAPP stuff */ 108 case 0x2013801: /* CAPP stuff */ 109 case 0x2013802: /* CAPP stuff */ 110 return 0; 111 default: 112 return -1; 113 } 114 } 115 116 static bool xscom_write_default(PnvChip *chip, uint32_t pcba, uint64_t val) 117 { 118 /* We ignore writes to these */ 119 switch (pcba) { 120 case 0xf000f: /* chip id is RO */ 121 case 0x1010c00: /* PIBAM FIR */ 122 case 0x1010c01: /* PIBAM FIR */ 123 case 0x1010c02: /* PIBAM FIR */ 124 case 0x1010c03: /* PIBAM FIR MASK */ 125 case 0x1010c04: /* PIBAM FIR MASK */ 126 case 0x1010c05: /* PIBAM FIR MASK */ 127 /* P9 xscom reset */ 128 case 0x0090018: /* Receive status reg */ 129 case 0x0090012: /* log register */ 130 case 0x0090013: /* error register */ 131 132 /* P8 xscom reset */ 133 case 0x2020007: /* ADU stuff, log register */ 134 case 0x2020009: /* ADU stuff, error register */ 135 case 0x202000f: /* ADU stuff, receive status register*/ 136 137 case 0x2013028: /* CAPP stuff */ 138 case 0x201302a: /* CAPP stuff */ 139 case 0x2013801: /* CAPP stuff */ 140 case 0x2013802: /* CAPP stuff */ 141 142 /* P8 PRD registers */ 143 case PRD_P8_IPOLL_REG_MASK: 144 case PRD_P8_IPOLL_REG_STATUS: 145 case PRD_P9_IPOLL_REG_MASK: 146 case PRD_P9_IPOLL_REG_STATUS: 147 return true; 148 default: 149 return false; 150 } 151 } 152 153 static uint64_t xscom_read(void *opaque, hwaddr addr, unsigned width) 154 { 155 PnvChip *chip = opaque; 156 uint32_t pcba = pnv_xscom_pcba(chip, addr); 157 uint64_t val = 0; 158 MemTxResult result; 159 160 /* Handle some SCOMs here before dispatch */ 161 val = xscom_read_default(chip, pcba); 162 if (val != -1) { 163 goto complete; 164 } 165 166 val = address_space_ldq(&chip->xscom_as, (uint64_t) pcba << 3, 167 MEMTXATTRS_UNSPECIFIED, &result); 168 if (result != MEMTX_OK) { 169 qemu_log_mask(LOG_GUEST_ERROR, "XSCOM read failed at @0x%" 170 HWADDR_PRIx " pcba=0x%08x\n", addr, pcba); 171 xscom_complete(current_cpu, HMER_XSCOM_FAIL | HMER_XSCOM_DONE); 172 return 0; 173 } 174 175 complete: 176 xscom_complete(current_cpu, HMER_XSCOM_DONE); 177 return val; 178 } 179 180 static void xscom_write(void *opaque, hwaddr addr, uint64_t val, 181 unsigned width) 182 { 183 PnvChip *chip = opaque; 184 uint32_t pcba = pnv_xscom_pcba(chip, addr); 185 MemTxResult result; 186 187 /* Handle some SCOMs here before dispatch */ 188 if (xscom_write_default(chip, pcba, val)) { 189 goto complete; 190 } 191 192 address_space_stq(&chip->xscom_as, (uint64_t) pcba << 3, val, 193 MEMTXATTRS_UNSPECIFIED, &result); 194 if (result != MEMTX_OK) { 195 qemu_log_mask(LOG_GUEST_ERROR, "XSCOM write failed at @0x%" 196 HWADDR_PRIx " pcba=0x%08x data=0x%" PRIx64 "\n", 197 addr, pcba, val); 198 xscom_complete(current_cpu, HMER_XSCOM_FAIL | HMER_XSCOM_DONE); 199 return; 200 } 201 202 complete: 203 xscom_complete(current_cpu, HMER_XSCOM_DONE); 204 } 205 206 const MemoryRegionOps pnv_xscom_ops = { 207 .read = xscom_read, 208 .write = xscom_write, 209 .valid.min_access_size = 8, 210 .valid.max_access_size = 8, 211 .impl.min_access_size = 8, 212 .impl.max_access_size = 8, 213 .endianness = DEVICE_BIG_ENDIAN, 214 }; 215 216 void pnv_xscom_realize(PnvChip *chip, uint64_t size, Error **errp) 217 { 218 SysBusDevice *sbd = SYS_BUS_DEVICE(chip); 219 char *name; 220 221 name = g_strdup_printf("xscom-%x", chip->chip_id); 222 memory_region_init_io(&chip->xscom_mmio, OBJECT(chip), &pnv_xscom_ops, 223 chip, name, size); 224 sysbus_init_mmio(sbd, &chip->xscom_mmio); 225 226 memory_region_init(&chip->xscom, OBJECT(chip), name, size); 227 address_space_init(&chip->xscom_as, &chip->xscom, name); 228 g_free(name); 229 } 230 231 static const TypeInfo pnv_xscom_interface_info = { 232 .name = TYPE_PNV_XSCOM_INTERFACE, 233 .parent = TYPE_INTERFACE, 234 .class_size = sizeof(PnvXScomInterfaceClass), 235 }; 236 237 static void pnv_xscom_register_types(void) 238 { 239 type_register_static(&pnv_xscom_interface_info); 240 } 241 242 type_init(pnv_xscom_register_types) 243 244 typedef struct ForeachPopulateArgs { 245 void *fdt; 246 int xscom_offset; 247 } ForeachPopulateArgs; 248 249 static int xscom_dt_child(Object *child, void *opaque) 250 { 251 if (object_dynamic_cast(child, TYPE_PNV_XSCOM_INTERFACE)) { 252 ForeachPopulateArgs *args = opaque; 253 PnvXScomInterface *xd = PNV_XSCOM_INTERFACE(child); 254 PnvXScomInterfaceClass *xc = PNV_XSCOM_INTERFACE_GET_CLASS(xd); 255 256 if (xc->dt_xscom) { 257 _FDT((xc->dt_xscom(xd, args->fdt, args->xscom_offset))); 258 } 259 } 260 return 0; 261 } 262 263 static const char compat_p8[] = "ibm,power8-xscom\0ibm,xscom"; 264 static const char compat_p9[] = "ibm,power9-xscom\0ibm,xscom"; 265 266 int pnv_dt_xscom(PnvChip *chip, void *fdt, int root_offset) 267 { 268 uint64_t reg[2]; 269 int xscom_offset; 270 ForeachPopulateArgs args; 271 char *name; 272 273 if (pnv_chip_is_power9(chip)) { 274 reg[0] = cpu_to_be64(PNV9_XSCOM_BASE(chip)); 275 reg[1] = cpu_to_be64(PNV9_XSCOM_SIZE); 276 } else { 277 reg[0] = cpu_to_be64(PNV_XSCOM_BASE(chip)); 278 reg[1] = cpu_to_be64(PNV_XSCOM_SIZE); 279 } 280 281 name = g_strdup_printf("xscom@%" PRIx64, be64_to_cpu(reg[0])); 282 xscom_offset = fdt_add_subnode(fdt, root_offset, name); 283 _FDT(xscom_offset); 284 g_free(name); 285 _FDT((fdt_setprop_cell(fdt, xscom_offset, "ibm,chip-id", chip->chip_id))); 286 _FDT((fdt_setprop_cell(fdt, xscom_offset, "#address-cells", 1))); 287 _FDT((fdt_setprop_cell(fdt, xscom_offset, "#size-cells", 1))); 288 _FDT((fdt_setprop(fdt, xscom_offset, "reg", reg, sizeof(reg)))); 289 290 if (pnv_chip_is_power9(chip)) { 291 _FDT((fdt_setprop(fdt, xscom_offset, "compatible", compat_p9, 292 sizeof(compat_p9)))); 293 } else { 294 _FDT((fdt_setprop(fdt, xscom_offset, "compatible", compat_p8, 295 sizeof(compat_p8)))); 296 } 297 298 _FDT((fdt_setprop(fdt, xscom_offset, "scom-controller", NULL, 0))); 299 300 args.fdt = fdt; 301 args.xscom_offset = xscom_offset; 302 303 object_child_foreach(OBJECT(chip), xscom_dt_child, &args); 304 return 0; 305 } 306 307 void pnv_xscom_add_subregion(PnvChip *chip, hwaddr offset, MemoryRegion *mr) 308 { 309 memory_region_add_subregion(&chip->xscom, offset << 3, mr); 310 } 311 312 void pnv_xscom_region_init(MemoryRegion *mr, 313 struct Object *owner, 314 const MemoryRegionOps *ops, 315 void *opaque, 316 const char *name, 317 uint64_t size) 318 { 319 memory_region_init_io(mr, owner, ops, opaque, name, size << 3); 320 } 321