1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Loongson Extend I/O Interrupt Controller support 4 * 5 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 6 */ 7 8 #define pr_fmt(fmt) "eiointc: " fmt 9 10 #include <linux/cpuhotplug.h> 11 #include <linux/interrupt.h> 12 #include <linux/irq.h> 13 #include <linux/irqchip.h> 14 #include <linux/irqdomain.h> 15 #include <linux/irqchip/chained_irq.h> 16 #include <linux/kernel.h> 17 #include <linux/syscore_ops.h> 18 19 #define EIOINTC_REG_NODEMAP 0x14a0 20 #define EIOINTC_REG_IPMAP 0x14c0 21 #define EIOINTC_REG_ENABLE 0x1600 22 #define EIOINTC_REG_BOUNCE 0x1680 23 #define EIOINTC_REG_ISR 0x1800 24 #define EIOINTC_REG_ROUTE 0x1c00 25 26 #define VEC_REG_COUNT 4 27 #define VEC_COUNT_PER_REG 64 28 #define VEC_COUNT (VEC_REG_COUNT * VEC_COUNT_PER_REG) 29 #define VEC_REG_IDX(irq_id) ((irq_id) / VEC_COUNT_PER_REG) 30 #define VEC_REG_BIT(irq_id) ((irq_id) % VEC_COUNT_PER_REG) 31 #define EIOINTC_ALL_ENABLE 0xffffffff 32 33 #define MAX_EIO_NODES (NR_CPUS / CORES_PER_EIO_NODE) 34 35 static int nr_pics; 36 37 struct eiointc_priv { 38 u32 node; 39 u32 vec_count; 40 nodemask_t node_map; 41 cpumask_t cpuspan_map; 42 struct fwnode_handle *domain_handle; 43 struct irq_domain *eiointc_domain; 44 }; 45 46 static struct eiointc_priv *eiointc_priv[MAX_IO_PICS]; 47 48 static void eiointc_enable(void) 49 { 50 uint64_t misc; 51 52 misc = iocsr_read64(LOONGARCH_IOCSR_MISC_FUNC); 53 misc |= IOCSR_MISC_FUNC_EXT_IOI_EN; 54 iocsr_write64(misc, LOONGARCH_IOCSR_MISC_FUNC); 55 } 56 57 static int cpu_to_eio_node(int cpu) 58 { 59 return cpu_logical_map(cpu) / CORES_PER_EIO_NODE; 60 } 61 62 #ifdef CONFIG_SMP 63 static void eiointc_set_irq_route(int pos, unsigned int cpu, unsigned int mnode, nodemask_t *node_map) 64 { 65 int i, node, cpu_node, route_node; 66 unsigned char coremap; 67 uint32_t pos_off, data, data_byte, data_mask; 68 69 pos_off = pos & ~3; 70 data_byte = pos & 3; 71 data_mask = ~BIT_MASK(data_byte) & 0xf; 72 73 /* Calculate node and coremap of target irq */ 74 cpu_node = cpu_logical_map(cpu) / CORES_PER_EIO_NODE; 75 coremap = BIT(cpu_logical_map(cpu) % CORES_PER_EIO_NODE); 76 77 for_each_online_cpu(i) { 78 node = cpu_to_eio_node(i); 79 if (!node_isset(node, *node_map)) 80 continue; 81 82 /* EIO node 0 is in charge of inter-node interrupt dispatch */ 83 route_node = (node == mnode) ? cpu_node : node; 84 data = ((coremap | (route_node << 4)) << (data_byte * 8)); 85 csr_any_send(EIOINTC_REG_ROUTE + pos_off, data, data_mask, node * CORES_PER_EIO_NODE); 86 } 87 } 88 89 static DEFINE_RAW_SPINLOCK(affinity_lock); 90 91 static int eiointc_set_irq_affinity(struct irq_data *d, const struct cpumask *affinity, bool force) 92 { 93 unsigned int cpu; 94 unsigned long flags; 95 uint32_t vector, regaddr; 96 struct eiointc_priv *priv = d->domain->host_data; 97 98 raw_spin_lock_irqsave(&affinity_lock, flags); 99 100 cpu = cpumask_first_and_and(&priv->cpuspan_map, affinity, cpu_online_mask); 101 if (cpu >= nr_cpu_ids) { 102 raw_spin_unlock_irqrestore(&affinity_lock, flags); 103 return -EINVAL; 104 } 105 106 vector = d->hwirq; 107 regaddr = EIOINTC_REG_ENABLE + ((vector >> 5) << 2); 108 109 /* Mask target vector */ 110 csr_any_send(regaddr, EIOINTC_ALL_ENABLE & (~BIT(vector & 0x1F)), 111 0x0, priv->node * CORES_PER_EIO_NODE); 112 113 /* Set route for target vector */ 114 eiointc_set_irq_route(vector, cpu, priv->node, &priv->node_map); 115 116 /* Unmask target vector */ 117 csr_any_send(regaddr, EIOINTC_ALL_ENABLE, 118 0x0, priv->node * CORES_PER_EIO_NODE); 119 120 irq_data_update_effective_affinity(d, cpumask_of(cpu)); 121 122 raw_spin_unlock_irqrestore(&affinity_lock, flags); 123 124 return IRQ_SET_MASK_OK; 125 } 126 #endif 127 128 static int eiointc_index(int node) 129 { 130 int i; 131 132 for (i = 0; i < nr_pics; i++) { 133 if (node_isset(node, eiointc_priv[i]->node_map)) 134 return i; 135 } 136 137 return -1; 138 } 139 140 static int eiointc_router_init(unsigned int cpu) 141 { 142 int i, bit; 143 uint32_t data; 144 uint32_t node = cpu_to_eio_node(cpu); 145 int index = eiointc_index(node); 146 147 if (index < 0) { 148 pr_err("Error: invalid nodemap!\n"); 149 return -1; 150 } 151 152 if ((cpu_logical_map(cpu) % CORES_PER_EIO_NODE) == 0) { 153 eiointc_enable(); 154 155 for (i = 0; i < eiointc_priv[0]->vec_count / 32; i++) { 156 data = (((1 << (i * 2 + 1)) << 16) | (1 << (i * 2))); 157 iocsr_write32(data, EIOINTC_REG_NODEMAP + i * 4); 158 } 159 160 for (i = 0; i < eiointc_priv[0]->vec_count / 32 / 4; i++) { 161 bit = BIT(1 + index); /* Route to IP[1 + index] */ 162 data = bit | (bit << 8) | (bit << 16) | (bit << 24); 163 iocsr_write32(data, EIOINTC_REG_IPMAP + i * 4); 164 } 165 166 for (i = 0; i < eiointc_priv[0]->vec_count / 4; i++) { 167 /* Route to Node-0 Core-0 */ 168 if (index == 0) 169 bit = BIT(cpu_logical_map(0)); 170 else 171 bit = (eiointc_priv[index]->node << 4) | 1; 172 173 data = bit | (bit << 8) | (bit << 16) | (bit << 24); 174 iocsr_write32(data, EIOINTC_REG_ROUTE + i * 4); 175 } 176 177 for (i = 0; i < eiointc_priv[0]->vec_count / 32; i++) { 178 data = 0xffffffff; 179 iocsr_write32(data, EIOINTC_REG_ENABLE + i * 4); 180 iocsr_write32(data, EIOINTC_REG_BOUNCE + i * 4); 181 } 182 } 183 184 return 0; 185 } 186 187 static void eiointc_irq_dispatch(struct irq_desc *desc) 188 { 189 int i; 190 u64 pending; 191 bool handled = false; 192 struct irq_chip *chip = irq_desc_get_chip(desc); 193 struct eiointc_priv *priv = irq_desc_get_handler_data(desc); 194 195 chained_irq_enter(chip, desc); 196 197 for (i = 0; i < eiointc_priv[0]->vec_count / VEC_COUNT_PER_REG; i++) { 198 pending = iocsr_read64(EIOINTC_REG_ISR + (i << 3)); 199 200 /* Skip handling if pending bitmap is zero */ 201 if (!pending) 202 continue; 203 204 /* Clear the IRQs */ 205 iocsr_write64(pending, EIOINTC_REG_ISR + (i << 3)); 206 while (pending) { 207 int bit = __ffs(pending); 208 int irq = bit + VEC_COUNT_PER_REG * i; 209 210 generic_handle_domain_irq(priv->eiointc_domain, irq); 211 pending &= ~BIT(bit); 212 handled = true; 213 } 214 } 215 216 if (!handled) 217 spurious_interrupt(); 218 219 chained_irq_exit(chip, desc); 220 } 221 222 static void eiointc_ack_irq(struct irq_data *d) 223 { 224 } 225 226 static void eiointc_mask_irq(struct irq_data *d) 227 { 228 } 229 230 static void eiointc_unmask_irq(struct irq_data *d) 231 { 232 } 233 234 static struct irq_chip eiointc_irq_chip = { 235 .name = "EIOINTC", 236 .irq_ack = eiointc_ack_irq, 237 .irq_mask = eiointc_mask_irq, 238 .irq_unmask = eiointc_unmask_irq, 239 #ifdef CONFIG_SMP 240 .irq_set_affinity = eiointc_set_irq_affinity, 241 #endif 242 }; 243 244 static int eiointc_domain_alloc(struct irq_domain *domain, unsigned int virq, 245 unsigned int nr_irqs, void *arg) 246 { 247 int ret; 248 unsigned int i, type; 249 unsigned long hwirq = 0; 250 struct eiointc_priv *priv = domain->host_data; 251 252 ret = irq_domain_translate_onecell(domain, arg, &hwirq, &type); 253 if (ret) 254 return ret; 255 256 for (i = 0; i < nr_irqs; i++) { 257 irq_domain_set_info(domain, virq + i, hwirq + i, &eiointc_irq_chip, 258 priv, handle_edge_irq, NULL, NULL); 259 } 260 261 return 0; 262 } 263 264 static void eiointc_domain_free(struct irq_domain *domain, unsigned int virq, 265 unsigned int nr_irqs) 266 { 267 int i; 268 269 for (i = 0; i < nr_irqs; i++) { 270 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i); 271 272 irq_set_handler(virq + i, NULL); 273 irq_domain_reset_irq_data(d); 274 } 275 } 276 277 static const struct irq_domain_ops eiointc_domain_ops = { 278 .translate = irq_domain_translate_onecell, 279 .alloc = eiointc_domain_alloc, 280 .free = eiointc_domain_free, 281 }; 282 283 static void acpi_set_vec_parent(int node, struct irq_domain *parent, struct acpi_vector_group *vec_group) 284 { 285 int i; 286 287 for (i = 0; i < MAX_IO_PICS; i++) { 288 if (node == vec_group[i].node) { 289 vec_group[i].parent = parent; 290 return; 291 } 292 } 293 } 294 295 static struct irq_domain *acpi_get_vec_parent(int node, struct acpi_vector_group *vec_group) 296 { 297 int i; 298 299 for (i = 0; i < MAX_IO_PICS; i++) { 300 if (node == vec_group[i].node) 301 return vec_group[i].parent; 302 } 303 return NULL; 304 } 305 306 static int eiointc_suspend(void) 307 { 308 return 0; 309 } 310 311 static void eiointc_resume(void) 312 { 313 eiointc_router_init(0); 314 } 315 316 static struct syscore_ops eiointc_syscore_ops = { 317 .suspend = eiointc_suspend, 318 .resume = eiointc_resume, 319 }; 320 321 static int __init pch_pic_parse_madt(union acpi_subtable_headers *header, 322 const unsigned long end) 323 { 324 struct acpi_madt_bio_pic *pchpic_entry = (struct acpi_madt_bio_pic *)header; 325 unsigned int node = (pchpic_entry->address >> 44) & 0xf; 326 struct irq_domain *parent = acpi_get_vec_parent(node, pch_group); 327 328 if (parent) 329 return pch_pic_acpi_init(parent, pchpic_entry); 330 331 return 0; 332 } 333 334 static int __init pch_msi_parse_madt(union acpi_subtable_headers *header, 335 const unsigned long end) 336 { 337 struct irq_domain *parent; 338 struct acpi_madt_msi_pic *pchmsi_entry = (struct acpi_madt_msi_pic *)header; 339 int node; 340 341 if (cpu_has_flatmode) 342 node = cpu_to_node(eiointc_priv[nr_pics - 1]->node * CORES_PER_EIO_NODE); 343 else 344 node = eiointc_priv[nr_pics - 1]->node; 345 346 parent = acpi_get_vec_parent(node, msi_group); 347 348 if (parent) 349 return pch_msi_acpi_init(parent, pchmsi_entry); 350 351 return 0; 352 } 353 354 static int __init acpi_cascade_irqdomain_init(void) 355 { 356 int r; 357 358 r = acpi_table_parse_madt(ACPI_MADT_TYPE_BIO_PIC, pch_pic_parse_madt, 0); 359 if (r < 0) 360 return r; 361 362 r = acpi_table_parse_madt(ACPI_MADT_TYPE_MSI_PIC, pch_msi_parse_madt, 1); 363 if (r < 0) 364 return r; 365 366 return 0; 367 } 368 369 static int __init eiointc_init(struct eiointc_priv *priv, int parent_irq, 370 u64 node_map) 371 { 372 int i; 373 374 node_map = node_map ? node_map : -1ULL; 375 for_each_possible_cpu(i) { 376 if (node_map & (1ULL << (cpu_to_eio_node(i)))) { 377 node_set(cpu_to_eio_node(i), priv->node_map); 378 cpumask_or(&priv->cpuspan_map, &priv->cpuspan_map, 379 cpumask_of(i)); 380 } 381 } 382 383 priv->eiointc_domain = irq_domain_create_linear(priv->domain_handle, 384 priv->vec_count, 385 &eiointc_domain_ops, 386 priv); 387 if (!priv->eiointc_domain) { 388 pr_err("loongson-extioi: cannot add IRQ domain\n"); 389 return -ENOMEM; 390 } 391 392 eiointc_priv[nr_pics++] = priv; 393 eiointc_router_init(0); 394 irq_set_chained_handler_and_data(parent_irq, eiointc_irq_dispatch, priv); 395 396 if (nr_pics == 1) { 397 register_syscore_ops(&eiointc_syscore_ops); 398 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_LOONGARCH_STARTING, 399 "irqchip/loongarch/intc:starting", 400 eiointc_router_init, NULL); 401 } 402 403 return 0; 404 } 405 406 int __init eiointc_acpi_init(struct irq_domain *parent, 407 struct acpi_madt_eio_pic *acpi_eiointc) 408 { 409 int parent_irq, ret; 410 struct eiointc_priv *priv; 411 int node; 412 413 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 414 if (!priv) 415 return -ENOMEM; 416 417 priv->domain_handle = irq_domain_alloc_named_id_fwnode("EIOPIC", 418 acpi_eiointc->node); 419 if (!priv->domain_handle) { 420 pr_err("Unable to allocate domain handle\n"); 421 goto out_free_priv; 422 } 423 424 priv->vec_count = VEC_COUNT; 425 priv->node = acpi_eiointc->node; 426 427 parent_irq = irq_create_mapping(parent, acpi_eiointc->cascade); 428 429 ret = eiointc_init(priv, parent_irq, acpi_eiointc->node_map); 430 if (ret < 0) 431 goto out_free_handle; 432 433 if (cpu_has_flatmode) 434 node = cpu_to_node(acpi_eiointc->node * CORES_PER_EIO_NODE); 435 else 436 node = acpi_eiointc->node; 437 acpi_set_vec_parent(node, priv->eiointc_domain, pch_group); 438 acpi_set_vec_parent(node, priv->eiointc_domain, msi_group); 439 440 ret = acpi_cascade_irqdomain_init(); 441 if (ret < 0) 442 goto out_free_handle; 443 444 return ret; 445 446 out_free_handle: 447 irq_domain_free_fwnode(priv->domain_handle); 448 priv->domain_handle = NULL; 449 out_free_priv: 450 kfree(priv); 451 452 return -ENOMEM; 453 } 454 455 static int __init eiointc_of_init(struct device_node *of_node, 456 struct device_node *parent) 457 { 458 int parent_irq, ret; 459 struct eiointc_priv *priv; 460 461 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 462 if (!priv) 463 return -ENOMEM; 464 465 parent_irq = irq_of_parse_and_map(of_node, 0); 466 if (parent_irq <= 0) { 467 ret = -ENODEV; 468 goto out_free_priv; 469 } 470 471 ret = irq_set_handler_data(parent_irq, priv); 472 if (ret < 0) 473 goto out_free_priv; 474 475 /* 476 * In particular, the number of devices supported by the LS2K0500 477 * extended I/O interrupt vector is 128. 478 */ 479 if (of_device_is_compatible(of_node, "loongson,ls2k0500-eiointc")) 480 priv->vec_count = 128; 481 else 482 priv->vec_count = VEC_COUNT; 483 484 priv->node = 0; 485 priv->domain_handle = of_node_to_fwnode(of_node); 486 487 ret = eiointc_init(priv, parent_irq, 0); 488 if (ret < 0) 489 goto out_free_priv; 490 491 return 0; 492 493 out_free_priv: 494 kfree(priv); 495 return ret; 496 } 497 498 IRQCHIP_DECLARE(loongson_ls2k0500_eiointc, "loongson,ls2k0500-eiointc", eiointc_of_init); 499 IRQCHIP_DECLARE(loongson_ls2k2000_eiointc, "loongson,ls2k2000-eiointc", eiointc_of_init); 500