arch/ia64/sn/kernel/irq.c

   1 /*
   2  * Platform dependent support for SGI SN
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
   9  */
  10
  11 #include <linux/irq.h>
  12 #include <asm/sn/intr.h>
  13 #include <asm/sn/addrs.h>
  14 #include <asm/sn/arch.h>
  15 #include "xtalk/xwidgetdev.h"
  16 #include "pci/pcibus_provider_defs.h"
  17 #include "pci/pcidev.h"
  18 #include "pci/pcibr_provider.h"
  19 #include <asm/sn/shub_mmr.h>
  20 #include <asm/sn/sn_sal.h>
  21
  22 static void force_interrupt(int irq);
  23 static void register_intr_pda(struct sn_irq_info *sn_irq_info);
  24 static void unregister_intr_pda(struct sn_irq_info *sn_irq_info);
  25
  26 extern int sn_force_interrupt_flag;
  27 extern int sn_ioif_inited;
  28 struct sn_irq_info **sn_irq;
  29
  30 static inline uint64_t sn_intr_alloc(nasid_t local_nasid, int local_widget,
  31                                      u64 sn_irq_info,
  32                                      int req_irq, nasid_t req_nasid,
  33                                      int req_slice)
  34 {
  35         struct ia64_sal_retval ret_stuff;
  36         ret_stuff.status = 0;
  37         ret_stuff.v0 = 0;
  38
  39         SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
  40                         (u64) SAL_INTR_ALLOC, (u64) local_nasid,
  41                         (u64) local_widget, (u64) sn_irq_info, (u64) req_irq,
  42                         (u64) req_nasid, (u64) req_slice);
  43         return ret_stuff.status;
  44 }
  45
  46 static inline void sn_intr_free(nasid_t local_nasid, int local_widget,
  47                                 struct sn_irq_info *sn_irq_info)
  48 {
  49         struct ia64_sal_retval ret_stuff;
  50         ret_stuff.status = 0;
  51         ret_stuff.v0 = 0;
  52
  53         SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
  54                         (u64) SAL_INTR_FREE, (u64) local_nasid,
  55                         (u64) local_widget, (u64) sn_irq_info->irq_irq,
  56                         (u64) sn_irq_info->irq_cookie, 0, 0);
  57 }
  58
  59 static unsigned int sn_startup_irq(unsigned int irq)
  60 {
  61         return 0;
  62 }
  63
  64 static void sn_shutdown_irq(unsigned int irq)
  65 {
  66 }
  67
  68 static void sn_disable_irq(unsigned int irq)
  69 {
  70 }
  71
  72 static void sn_enable_irq(unsigned int irq)
  73 {
  74 }
  75
  76 static void sn_ack_irq(unsigned int irq)
  77 {
  78         uint64_t event_occurred, mask = 0;
  79         int nasid;
  80
  81         irq = irq & 0xff;
  82         nasid = get_nasid();
  83         event_occurred =
  84             HUB_L((uint64_t *) GLOBAL_MMR_ADDR(nasid, SH_EVENT_OCCURRED));
  85         if (event_occurred & SH_EVENT_OCCURRED_UART_INT_MASK) {
  86                 mask |= (1 << SH_EVENT_OCCURRED_UART_INT_SHFT);
  87         }
  88         if (event_occurred & SH_EVENT_OCCURRED_IPI_INT_MASK) {
  89                 mask |= (1 << SH_EVENT_OCCURRED_IPI_INT_SHFT);
  90         }
  91         if (event_occurred & SH_EVENT_OCCURRED_II_INT0_MASK) {
  92                 mask |= (1 << SH_EVENT_OCCURRED_II_INT0_SHFT);
  93         }
  94         if (event_occurred & SH_EVENT_OCCURRED_II_INT1_MASK) {
  95                 mask |= (1 << SH_EVENT_OCCURRED_II_INT1_SHFT);
  96         }
  97         HUB_S((uint64_t *) GLOBAL_MMR_ADDR(nasid, SH_EVENT_OCCURRED_ALIAS),
  98               mask);
  99         __set_bit(irq, (volatile void *)pda->sn_in_service_ivecs);
 100
 101         move_irq(irq);
 102 }
 103
 104 static void sn_end_irq(unsigned int irq)
 105 {
 106         int nasid;
 107         int ivec;
 108         uint64_t event_occurred;
 109
 110         ivec = irq & 0xff;
 111         if (ivec == SGI_UART_VECTOR) {
 112                 nasid = get_nasid();
 113                 event_occurred = HUB_L((uint64_t *) GLOBAL_MMR_ADDR
 114                                        (nasid, SH_EVENT_OCCURRED));
 115                 /* If the UART bit is set here, we may have received an
 116                  * interrupt from the UART that the driver missed.  To
 117                  * make sure, we IPI ourselves to force us to look again.
 118                  */
 119                 if (event_occurred & SH_EVENT_OCCURRED_UART_INT_MASK) {
 120                         platform_send_ipi(smp_processor_id(), SGI_UART_VECTOR,
 121                                           IA64_IPI_DM_INT, 0);
 122                 }
 123         }
 124         __clear_bit(ivec, (volatile void *)pda->sn_in_service_ivecs);
 125         if (sn_force_interrupt_flag)
 126                 force_interrupt(irq);
 127 }
 128
 129 static void sn_set_affinity_irq(unsigned int irq, cpumask_t mask)
 130 {
 131         struct sn_irq_info *sn_irq_info = sn_irq[irq];
 132         struct sn_irq_info *tmp_sn_irq_info;
 133         int cpuid, cpuphys;
 134         nasid_t t_nasid;        /* nasid to target */
 135         int t_slice;            /* slice to target */
 136
 137         /* allocate a temp sn_irq_info struct to get new target info */
 138         tmp_sn_irq_info = kmalloc(sizeof(*tmp_sn_irq_info), GFP_KERNEL);
 139         if (!tmp_sn_irq_info)
 140                 return;
 141
 142         cpuid = first_cpu(mask);
 143         cpuphys = cpu_physical_id(cpuid);
 144         t_nasid = cpuid_to_nasid(cpuid);
 145         t_slice = cpuid_to_slice(cpuid);
 146
 147         while (sn_irq_info) {
 148                 int status;
 149                 int local_widget;
 150                 uint64_t bridge = (uint64_t) sn_irq_info->irq_bridge;
 151                 nasid_t local_nasid = NASID_GET(bridge);
 152
 153                 if (!bridge)
 154                         break;  /* irq is not a device interrupt */
 155
 156                 if (local_nasid & 1)
 157                         local_widget = TIO_SWIN_WIDGETNUM(bridge);
 158                 else
 159                         local_widget = SWIN_WIDGETNUM(bridge);
 160
 161                 /* Free the old PROM sn_irq_info structure */
 162                 sn_intr_free(local_nasid, local_widget, sn_irq_info);
 163
 164                 /* allocate a new PROM sn_irq_info struct */
 165                 status = sn_intr_alloc(local_nasid, local_widget,
 166                                        __pa(tmp_sn_irq_info), irq, t_nasid,
 167                                        t_slice);
 168
 169                 if (status == 0) {
 170                         /* Update kernels sn_irq_info with new target info */
 171                         unregister_intr_pda(sn_irq_info);
 172                         sn_irq_info->irq_cpuid = cpuid;
 173                         sn_irq_info->irq_nasid = t_nasid;
 174                         sn_irq_info->irq_slice = t_slice;
 175                         sn_irq_info->irq_xtalkaddr =
 176                             tmp_sn_irq_info->irq_xtalkaddr;
 177                         sn_irq_info->irq_cookie = tmp_sn_irq_info->irq_cookie;
 178                         register_intr_pda(sn_irq_info);
 179
 180                         if (IS_PCI_BRIDGE_ASIC(sn_irq_info->irq_bridge_type)) {
 181                                 pcibr_change_devices_irq(sn_irq_info);
 182                         }
 183
 184                         sn_irq_info = sn_irq_info->irq_next;
 185
 186 #ifdef CONFIG_SMP
 187                         set_irq_affinity_info((irq & 0xff), cpuphys, 0);
 188 #endif
 189                 } else {
 190                         break;  /* snp_affinity failed the intr_alloc */
 191                 }
 192         }
 193         kfree(tmp_sn_irq_info);
 194 }
 195
 196 struct hw_interrupt_type irq_type_sn = {
 197         "SN hub",
 198         sn_startup_irq,
 199         sn_shutdown_irq,
 200         sn_enable_irq,
 201         sn_disable_irq,
 202         sn_ack_irq,
 203         sn_end_irq,
 204         sn_set_affinity_irq
 205 };
 206
 207 unsigned int sn_local_vector_to_irq(u8 vector)
 208 {
 209         return (CPU_VECTOR_TO_IRQ(smp_processor_id(), vector));
 210 }
 211
 212 void sn_irq_init(void)
 213 {
 214         int i;
 215         irq_desc_t *base_desc = irq_desc;
 216
 217         for (i = 0; i < NR_IRQS; i++) {
 218                 if (base_desc[i].handler == &no_irq_type) {
 219                         base_desc[i].handler = &irq_type_sn;
 220                 }
 221         }
 222 }
 223
 224 static void register_intr_pda(struct sn_irq_info *sn_irq_info)
 225 {
 226         int irq = sn_irq_info->irq_irq;
 227         int cpu = sn_irq_info->irq_cpuid;
 228
 229         if (pdacpu(cpu)->sn_last_irq < irq) {
 230                 pdacpu(cpu)->sn_last_irq = irq;
 231         }
 232
 233         if (pdacpu(cpu)->sn_first_irq == 0 || pdacpu(cpu)->sn_first_irq > irq) {
 234                 pdacpu(cpu)->sn_first_irq = irq;
 235         }
 236 }
 237
 238 static void unregister_intr_pda(struct sn_irq_info *sn_irq_info)
 239 {
 240         int irq = sn_irq_info->irq_irq;
 241         int cpu = sn_irq_info->irq_cpuid;
 242         struct sn_irq_info *tmp_irq_info;
 243         int i, foundmatch;
 244
 245         if (pdacpu(cpu)->sn_last_irq == irq) {
 246                 foundmatch = 0;
 247                 for (i = pdacpu(cpu)->sn_last_irq - 1; i; i--) {
 248                         tmp_irq_info = sn_irq[i];
 249                         while (tmp_irq_info) {
 250                                 if (tmp_irq_info->irq_cpuid == cpu) {
 251                                         foundmatch++;
 252                                         break;
 253                                 }
 254                                 tmp_irq_info = tmp_irq_info->irq_next;
 255                         }
 256                         if (foundmatch) {
 257                                 break;
 258                         }
 259                 }
 260                 pdacpu(cpu)->sn_last_irq = i;
 261         }
 262
 263         if (pdacpu(cpu)->sn_first_irq == irq) {
 264                 foundmatch = 0;
 265                 for (i = pdacpu(cpu)->sn_first_irq + 1; i < NR_IRQS; i++) {
 266                         tmp_irq_info = sn_irq[i];
 267                         while (tmp_irq_info) {
 268                                 if (tmp_irq_info->irq_cpuid == cpu) {
 269                                         foundmatch++;
 270                                         break;
 271                                 }
 272                                 tmp_irq_info = tmp_irq_info->irq_next;
 273                         }
 274                         if (foundmatch) {
 275                                 break;
 276                         }
 277                 }
 278                 pdacpu(cpu)->sn_first_irq = ((i == NR_IRQS) ? 0 : i);
 279         }
 280 }
 281
 282 struct sn_irq_info *sn_irq_alloc(nasid_t local_nasid, int local_widget, int irq,
 283                                  nasid_t nasid, int slice)
 284 {
 285         struct sn_irq_info *sn_irq_info;
 286         int status;
 287
 288         sn_irq_info = kmalloc(sizeof(*sn_irq_info), GFP_KERNEL);
 289         if (sn_irq_info == NULL)
 290                 return NULL;
 291
 292         memset(sn_irq_info, 0x0, sizeof(*sn_irq_info));
 293
 294         status =
 295             sn_intr_alloc(local_nasid, local_widget, __pa(sn_irq_info), irq,
 296                           nasid, slice);
 297
 298         if (status) {
 299                 kfree(sn_irq_info);
 300                 return NULL;
 301         } else {
 302                 return sn_irq_info;
 303         }
 304 }
 305
 306 void sn_irq_free(struct sn_irq_info *sn_irq_info)
 307 {
 308         uint64_t bridge = (uint64_t) sn_irq_info->irq_bridge;
 309         nasid_t local_nasid = NASID_GET(bridge);
 310         int local_widget;
 311
 312         if (local_nasid & 1)    /* tio check */
 313                 local_widget = TIO_SWIN_WIDGETNUM(bridge);
 314         else
 315                 local_widget = SWIN_WIDGETNUM(bridge);
 316
 317         sn_intr_free(local_nasid, local_widget, sn_irq_info);
 318
 319         kfree(sn_irq_info);
 320 }
 321
 322 void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
 323 {
 324         nasid_t nasid = sn_irq_info->irq_nasid;
 325         int slice = sn_irq_info->irq_slice;
 326         int cpu = nasid_slice_to_cpuid(nasid, slice);
 327
 328         sn_irq_info->irq_cpuid = cpu;
 329         sn_irq_info->irq_pciioinfo = SN_PCIDEV_INFO(pci_dev);
 330
 331         /* link it into the sn_irq[irq] list */
 332         sn_irq_info->irq_next = sn_irq[sn_irq_info->irq_irq];
 333         sn_irq[sn_irq_info->irq_irq] = sn_irq_info;
 334
 335         (void)register_intr_pda(sn_irq_info);
 336 }
 337
 338 static void force_interrupt(int irq)
 339 {
 340         struct sn_irq_info *sn_irq_info;
 341
 342         if (!sn_ioif_inited)
 343                 return;
 344         sn_irq_info = sn_irq[irq];
 345         while (sn_irq_info) {
 346                 if (IS_PCI_BRIDGE_ASIC(sn_irq_info->irq_bridge_type) &&
 347                     (sn_irq_info->irq_bridge != NULL)) {
 348                         pcibr_force_interrupt(sn_irq_info);
 349                 }
 350                 sn_irq_info = sn_irq_info->irq_next;
 351         }
 352 }
 353
 354 /*
 355  * Check for lost interrupts.  If the PIC int_status reg. says that
 356  * an interrupt has been sent, but not handled, and the interrupt
 357  * is not pending in either the cpu irr regs or in the soft irr regs,
 358  * and the interrupt is not in service, then the interrupt may have
 359  * been lost.  Force an interrupt on that pin.  It is possible that
 360  * the interrupt is in flight, so we may generate a spurious interrupt,
 361  * but we should never miss a real lost interrupt.
 362  */
 363 static void sn_check_intr(int irq, struct sn_irq_info *sn_irq_info)
 364 {
 365         uint64_t regval;
 366         int irr_reg_num;
 367         int irr_bit;
 368         uint64_t irr_reg;
 369         struct pcidev_info *pcidev_info;
 370         struct pcibus_info *pcibus_info;
 371
 372         pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
 373         if (!pcidev_info)
 374                 return;
 375
 376         pcibus_info =
 377             (struct pcibus_info *)pcidev_info->pdi_host_pcidev_info->
 378             pdi_pcibus_info;
 379         regval = pcireg_intr_status_get(pcibus_info);
 380
 381         irr_reg_num = irq_to_vector(irq) / 64;
 382         irr_bit = irq_to_vector(irq) % 64;
 383         switch (irr_reg_num) {
 384         case 0:
 385                 irr_reg = ia64_getreg(_IA64_REG_CR_IRR0);
 386                 break;
 387         case 1:
 388                 irr_reg = ia64_getreg(_IA64_REG_CR_IRR1);
 389                 break;
 390         case 2:
 391                 irr_reg = ia64_getreg(_IA64_REG_CR_IRR2);
 392                 break;
 393         case 3:
 394                 irr_reg = ia64_getreg(_IA64_REG_CR_IRR3);
 395                 break;
 396         }
 397         if (!test_bit(irr_bit, &irr_reg)) {
 398                 if (!test_bit(irq, pda->sn_soft_irr)) {
 399                         if (!test_bit(irq, pda->sn_in_service_ivecs)) {
 400                                 regval &= 0xff;
 401                                 if (sn_irq_info->irq_int_bit & regval &
 402                                     sn_irq_info->irq_last_intr) {
 403                                         regval &=
 404                                             ~(sn_irq_info->
 405                                               irq_int_bit & regval);
 406                                         pcibr_force_interrupt(sn_irq_info);
 407                                 }
 408                         }
 409                 }
 410         }
 411         sn_irq_info->irq_last_intr = regval;
 412 }
 413
 414 void sn_lb_int_war_check(void)
 415 {
 416         int i;
 417
 418         if (!sn_ioif_inited || pda->sn_first_irq == 0)
 419                 return;
 420         for (i = pda->sn_first_irq; i <= pda->sn_last_irq; i++) {
 421                 struct sn_irq_info *sn_irq_info = sn_irq[i];
 422                 while (sn_irq_info) {
 423                         /* Only call for PCI bridges that are fully initialized. */
 424                         if (IS_PCI_BRIDGE_ASIC(sn_irq_info->irq_bridge_type) &&
 425                             (sn_irq_info->irq_bridge != NULL)) {
 426                                 sn_check_intr(i, sn_irq_info);
 427                         }
 428                         sn_irq_info = sn_irq_info->irq_next;
 429                 }
 430         }
 431 }