arch/ppc64/kernel/iSeries_irq.c

   1 /*
   2  * This module supports the iSeries PCI bus interrupt handling
   3  * Copyright (C) 20yy  <Robert L Holtorf> <IBM Corp>
   4  * Copyright (C) 2004-2005 IBM Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the:
  18  * Free Software Foundation, Inc.,
  19  * 59 Temple Place, Suite 330,
  20  * Boston, MA  02111-1307  USA
  21  *
  22  * Change Activity:
  23  *   Created, December 13, 2000 by Wayne Holm
  24  * End Change Activity
  25  */
  26 #include <linux/config.h>
  27 #include <linux/pci.h>
  28 #include <linux/init.h>
  29 #include <linux/threads.h>
  30 #include <linux/smp.h>
  31 #include <linux/param.h>
  32 #include <linux/string.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/ide.h>
  35 #include <linux/irq.h>
  36 #include <linux/spinlock.h>
  37
  38 #include <asm/ppcdebug.h>
  39 #include <asm/iSeries/HvTypes.h>
  40 #include <asm/iSeries/HvLpEvent.h>
  41 #include <asm/iSeries/HvCallPci.h>
  42 #include <asm/iSeries/HvCallXm.h>
  43 #include <asm/iSeries/iSeries_irq.h>
  44
  45 /* This maps virtual irq numbers to real irqs */
  46 unsigned int virt_irq_to_real_map[NR_IRQS];
  47
  48 /* The next available virtual irq number */
  49 /* Note: the pcnet32 driver assumes irq numbers < 2 aren't valid. :( */
  50 static int next_virtual_irq = 2;
  51
  52 static long Pci_Interrupt_Count;
  53 static long Pci_Event_Count;
  54
  55 enum XmPciLpEvent_Subtype {
  56         XmPciLpEvent_BusCreated         = 0,    // PHB has been created
  57         XmPciLpEvent_BusError           = 1,    // PHB has failed
  58         XmPciLpEvent_BusFailed          = 2,    // Msg to Secondary, Primary failed bus
  59         XmPciLpEvent_NodeFailed         = 4,    // Multi-adapter bridge has failed
  60         XmPciLpEvent_NodeRecovered      = 5,    // Multi-adapter bridge has recovered
  61         XmPciLpEvent_BusRecovered       = 12,   // PHB has been recovered
  62         XmPciLpEvent_UnQuiesceBus       = 18,   // Secondary bus unqiescing
  63         XmPciLpEvent_BridgeError        = 21,   // Bridge Error
  64         XmPciLpEvent_SlotInterrupt      = 22    // Slot interrupt
  65 };
  66
  67 struct XmPciLpEvent_BusInterrupt {
  68         HvBusNumber     busNumber;
  69         HvSubBusNumber  subBusNumber;
  70 };
  71
  72 struct XmPciLpEvent_NodeInterrupt {
  73         HvBusNumber     busNumber;
  74         HvSubBusNumber  subBusNumber;
  75         HvAgentId       deviceId;
  76 };
  77
  78 struct XmPciLpEvent {
  79         struct HvLpEvent hvLpEvent;
  80
  81         union {
  82                 u64 alignData;                  // Align on an 8-byte boundary
  83
  84                 struct {
  85                         u32             fisr;
  86                         HvBusNumber     busNumber;
  87                         HvSubBusNumber  subBusNumber;
  88                         HvAgentId       deviceId;
  89                 } slotInterrupt;
  90
  91                 struct XmPciLpEvent_BusInterrupt busFailed;
  92                 struct XmPciLpEvent_BusInterrupt busRecovered;
  93                 struct XmPciLpEvent_BusInterrupt busCreated;
  94
  95                 struct XmPciLpEvent_NodeInterrupt nodeFailed;
  96                 struct XmPciLpEvent_NodeInterrupt nodeRecovered;
  97
  98         } eventData;
  99
 100 };
 101
 102 static void intReceived(struct XmPciLpEvent *eventParm,
 103                 struct pt_regs *regsParm)
 104 {
 105         int irq;
 106
 107         ++Pci_Interrupt_Count;
 108 #if 0
 109         PPCDBG(PPCDBG_BUSWALK, "PCI: XmPciLpEvent.c: intReceived\n");
 110 #endif
 111
 112         switch (eventParm->hvLpEvent.xSubtype) {
 113         case XmPciLpEvent_SlotInterrupt:
 114                 irq = eventParm->hvLpEvent.xCorrelationToken;
 115                 /* Dispatch the interrupt handlers for this irq */
 116                 ppc_irq_dispatch_handler(regsParm, irq);
 117                 HvCallPci_eoi(eventParm->eventData.slotInterrupt.busNumber,
 118                         eventParm->eventData.slotInterrupt.subBusNumber,
 119                         eventParm->eventData.slotInterrupt.deviceId);
 120                 break;
 121                 /* Ignore error recovery events for now */
 122         case XmPciLpEvent_BusCreated:
 123                 printk(KERN_INFO "XmPciLpEvent.c: system bus %d created\n",
 124                         eventParm->eventData.busCreated.busNumber);
 125                 break;
 126         case XmPciLpEvent_BusError:
 127         case XmPciLpEvent_BusFailed:
 128                 printk(KERN_INFO "XmPciLpEvent.c: system bus %d failed\n",
 129                         eventParm->eventData.busFailed.busNumber);
 130                 break;
 131         case XmPciLpEvent_BusRecovered:
 132         case XmPciLpEvent_UnQuiesceBus:
 133                 printk(KERN_INFO "XmPciLpEvent.c: system bus %d recovered\n",
 134                         eventParm->eventData.busRecovered.busNumber);
 135                 break;
 136         case XmPciLpEvent_NodeFailed:
 137         case XmPciLpEvent_BridgeError:
 138                 printk(KERN_INFO
 139                         "XmPciLpEvent.c: multi-adapter bridge %d/%d/%d failed\n",
 140                         eventParm->eventData.nodeFailed.busNumber,
 141                         eventParm->eventData.nodeFailed.subBusNumber,
 142                         eventParm->eventData.nodeFailed.deviceId);
 143                 break;
 144         case XmPciLpEvent_NodeRecovered:
 145                 printk(KERN_INFO
 146                         "XmPciLpEvent.c: multi-adapter bridge %d/%d/%d recovered\n",
 147                         eventParm->eventData.nodeRecovered.busNumber,
 148                         eventParm->eventData.nodeRecovered.subBusNumber,
 149                         eventParm->eventData.nodeRecovered.deviceId);
 150                 break;
 151         default:
 152                 printk(KERN_ERR
 153                         "XmPciLpEvent.c: unrecognized event subtype 0x%x\n",
 154                         eventParm->hvLpEvent.xSubtype);
 155                 break;
 156         }
 157 }
 158
 159 static void XmPciLpEvent_handler(struct HvLpEvent *eventParm,
 160                 struct pt_regs *regsParm)
 161 {
 162 #ifdef CONFIG_PCI
 163 #if 0
 164         PPCDBG(PPCDBG_BUSWALK, "XmPciLpEvent_handler, type 0x%x\n",
 165                         eventParm->xType);
 166 #endif
 167         ++Pci_Event_Count;
 168
 169         if (eventParm && (eventParm->xType == HvLpEvent_Type_PciIo)) {
 170                 switch (eventParm->xFlags.xFunction) {
 171                 case HvLpEvent_Function_Int:
 172                         intReceived((struct XmPciLpEvent *)eventParm, regsParm);
 173                         break;
 174                 case HvLpEvent_Function_Ack:
 175                         printk(KERN_ERR
 176                                 "XmPciLpEvent.c: unexpected ack received\n");
 177                         break;
 178                 default:
 179                         printk(KERN_ERR
 180                                 "XmPciLpEvent.c: unexpected event function %d\n",
 181                                 (int)eventParm->xFlags.xFunction);
 182                         break;
 183                 }
 184         } else if (eventParm)
 185                 printk(KERN_ERR
 186                         "XmPciLpEvent.c: Unrecognized PCI event type 0x%x\n",
 187                         (int)eventParm->xType);
 188         else
 189                 printk(KERN_ERR "XmPciLpEvent.c: NULL event received\n");
 190 #endif
 191 }
 192
 193 /* This should be called sometime prior to buswalk (init_IRQ would be good) */
 194 int XmPciLpEvent_init()
 195 {
 196         int xRc;
 197
 198         PPCDBG(PPCDBG_BUSWALK,
 199                         "XmPciLpEvent_init, Register Event type 0x%04X\n",
 200                         HvLpEvent_Type_PciIo);
 201
 202         xRc = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo,
 203                         &XmPciLpEvent_handler);
 204         if (xRc == 0) {
 205                 xRc = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
 206                 if (xRc != 0)
 207                         printk(KERN_ERR "XmPciLpEvent.c: open event path "
 208                                         "failed with rc 0x%x\n", xRc);
 209         } else
 210                 printk(KERN_ERR "XmPciLpEvent.c: register handler "
 211                                 "failed with rc 0x%x\n", xRc);
 212         return xRc;
 213 }
 214
 215 /* This is called by init_IRQ.  set in ppc_md.init_IRQ by iSeries_setup.c */
 216 void __init iSeries_init_IRQ(void)
 217 {
 218         /* Register PCI event handler and open an event path */
 219         XmPciLpEvent_init();
 220 }
 221
 222 #define REAL_IRQ_TO_BUS(irq)    ((((irq) >> 6) & 0xff) + 1)
 223 #define REAL_IRQ_TO_IDSEL(irq)  ((((irq) >> 3) & 7) + 1)
 224 #define REAL_IRQ_TO_FUNC(irq)   ((irq) & 7)
 225
 226 /*
 227  * This will be called by device drivers (via enable_IRQ)
 228  * to enable INTA in the bridge interrupt status register.
 229  */
 230 static void iSeries_enable_IRQ(unsigned int irq)
 231 {
 232         u32 bus, deviceId, function, mask;
 233         const u32 subBus = 0;
 234         unsigned int rirq = virt_irq_to_real_map[irq];
 235
 236         /* The IRQ has already been locked by the caller */
 237         bus = REAL_IRQ_TO_BUS(rirq);
 238         function = REAL_IRQ_TO_FUNC(rirq);
 239         deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
 240
 241         /* Unmask secondary INTA */
 242         mask = 0x80000000;
 243         HvCallPci_unmaskInterrupts(bus, subBus, deviceId, mask);
 244         PPCDBG(PPCDBG_BUSWALK, "iSeries_enable_IRQ 0x%02X.%02X.%02X 0x%04X\n",
 245                         bus, subBus, deviceId, irq);
 246 }
 247
 248 /* This is called by iSeries_activate_IRQs */
 249 static unsigned int iSeries_startup_IRQ(unsigned int irq)
 250 {
 251         u32 bus, deviceId, function, mask;
 252         const u32 subBus = 0;
 253         unsigned int rirq = virt_irq_to_real_map[irq];
 254
 255         bus = REAL_IRQ_TO_BUS(rirq);
 256         function = REAL_IRQ_TO_FUNC(rirq);
 257         deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
 258
 259         /* Link the IRQ number to the bridge */
 260         HvCallXm_connectBusUnit(bus, subBus, deviceId, irq);
 261
 262         /* Unmask bridge interrupts in the FISR */
 263         mask = 0x01010000 << function;
 264         HvCallPci_unmaskFisr(bus, subBus, deviceId, mask);
 265         iSeries_enable_IRQ(irq);
 266         return 0;
 267 }
 268
 269 /*
 270  * This is called out of iSeries_fixup to activate interrupt
 271  * generation for usable slots
 272  */
 273 void __init iSeries_activate_IRQs()
 274 {
 275         int irq;
 276         unsigned long flags;
 277
 278         for_each_irq (irq) {
 279                 irq_desc_t *desc = get_irq_desc(irq);
 280
 281                 if (desc && desc->handler && desc->handler->startup) {
 282                         spin_lock_irqsave(&desc->lock, flags);
 283                         desc->handler->startup(irq);
 284                         spin_unlock_irqrestore(&desc->lock, flags);
 285                 }
 286         }
 287 }
 288
 289 /*  this is not called anywhere currently */
 290 static void iSeries_shutdown_IRQ(unsigned int irq)
 291 {
 292         u32 bus, deviceId, function, mask;
 293         const u32 subBus = 0;
 294         unsigned int rirq = virt_irq_to_real_map[irq];
 295
 296         /* irq should be locked by the caller */
 297         bus = REAL_IRQ_TO_BUS(rirq);
 298         function = REAL_IRQ_TO_FUNC(rirq);
 299         deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
 300
 301         /* Invalidate the IRQ number in the bridge */
 302         HvCallXm_connectBusUnit(bus, subBus, deviceId, 0);
 303
 304         /* Mask bridge interrupts in the FISR */
 305         mask = 0x01010000 << function;
 306         HvCallPci_maskFisr(bus, subBus, deviceId, mask);
 307 }
 308
 309 /*
 310  * This will be called by device drivers (via disable_IRQ)
 311  * to disable INTA in the bridge interrupt status register.
 312  */
 313 static void iSeries_disable_IRQ(unsigned int irq)
 314 {
 315         u32 bus, deviceId, function, mask;
 316         const u32 subBus = 0;
 317         unsigned int rirq = virt_irq_to_real_map[irq];
 318
 319         /* The IRQ has already been locked by the caller */
 320         bus = REAL_IRQ_TO_BUS(rirq);
 321         function = REAL_IRQ_TO_FUNC(rirq);
 322         deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
 323
 324         /* Mask secondary INTA   */
 325         mask = 0x80000000;
 326         HvCallPci_maskInterrupts(bus, subBus, deviceId, mask);
 327         PPCDBG(PPCDBG_BUSWALK, "iSeries_disable_IRQ 0x%02X.%02X.%02X 0x%04X\n",
 328                         bus, subBus, deviceId, irq);
 329 }
 330
 331 /*
 332  * Need to define this so ppc_irq_dispatch_handler will NOT call
 333  * enable_IRQ at the end of interrupt handling.  However, this does
 334  * nothing because there is not enough information provided to do
 335  * the EOI HvCall.  This is done by XmPciLpEvent.c
 336  */
 337 static void iSeries_end_IRQ(unsigned int irq)
 338 {
 339 }
 340
 341 static hw_irq_controller iSeries_IRQ_handler = {
 342         .typename = "iSeries irq controller",
 343         .startup = iSeries_startup_IRQ,
 344         .shutdown = iSeries_shutdown_IRQ,
 345         .enable = iSeries_enable_IRQ,
 346         .disable = iSeries_disable_IRQ,
 347         .end = iSeries_end_IRQ
 348 };
 349
 350 /*
 351  * This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot
 352  * It calculates the irq value for the slot.
 353  * Note that subBusNumber is always 0 (at the moment at least).
 354  */
 355 int __init iSeries_allocate_IRQ(HvBusNumber busNumber,
 356                 HvSubBusNumber subBusNumber, HvAgentId deviceId)
 357 {
 358         unsigned int realirq, virtirq;
 359         u8 idsel = (deviceId >> 4);
 360         u8 function = deviceId & 7;
 361
 362         virtirq = next_virtual_irq++;
 363         realirq = ((busNumber - 1) << 6) + ((idsel - 1) << 3) + function;
 364         virt_irq_to_real_map[virtirq] = realirq;
 365
 366         irq_desc[virtirq].handler = &iSeries_IRQ_handler;
 367         return virtirq;
 368 }