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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 | /************************************************************************/ /* This module supports the iSeries PCI bus interrupt handling */ /* Copyright (C) 20yy <Robert L Holtorf> <IBM Corp> */ /* */ /* This program is free software; you can redistribute it and/or modify */ /* it under the terms of the GNU General Public License as published by */ /* the Free Software Foundation; either version 2 of the License, or */ /* (at your option) any later version. */ /* */ /* This program is distributed in the hope that it will be useful, */ /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ /* GNU General Public License for more details. */ /* */ /* You should have received a copy of the GNU General Public License */ /* along with this program; if not, write to the: */ /* Free Software Foundation, Inc., */ /* 59 Temple Place, Suite 330, */ /* Boston, MA 02111-1307 USA */ /************************************************************************/ /* Change Activity: */ /* Created, December 13, 2000 by Wayne Holm */ /* End Change Activity */ /************************************************************************/ #include <linux/pci.h> #include <linux/config.h> #include <linux/init.h> #include <linux/threads.h> #include <linux/smp.h> #include <linux/param.h> #include <linux/string.h> #include <linux/bootmem.h> #include <linux/blk.h> #include <linux/ide.h> #include <linux/irq.h> #include <linux/spinlock.h> #include <linux/slab.h> #include <asm/iSeries/HvCallPci.h> #include <asm/iSeries/HvCallXm.h> #include <asm/iSeries/iSeries_irq.h> #include <asm/iSeries/XmPciLpEvent.h> hw_irq_controller iSeries_IRQ_handler = { "iSeries irq controller", iSeries_startup_IRQ, /* startup */ iSeries_shutdown_IRQ, /* shutdown */ iSeries_enable_IRQ, /* enable */ iSeries_disable_IRQ, /* disable */ NULL, /* ack */ iSeries_end_IRQ, /* end */ NULL /* set_affinity */ }; struct iSeries_irqEntry { u32 dsa; struct iSeries_irqEntry* next; }; struct iSeries_irqAnchor { u8 valid : 1; u8 reserved : 7; u16 entryCount; struct iSeries_irqEntry* head; }; struct iSeries_irqAnchor iSeries_irqMap[NR_IRQS]; void iSeries_init_irqMap(int irq); /* This is called by init_IRQ. set in ppc_md.init_IRQ by iSeries_setup.c */ void __init iSeries_init_IRQ(void) { int i; for (i = 0; i < NR_IRQS; i++) { irq_desc[i].handler = &iSeries_IRQ_handler; irq_desc[i].status = 0; irq_desc[i].status |= IRQ_DISABLED; irq_desc[i].depth = 1; iSeries_init_irqMap(i); } /* Register PCI event handler and open an event path */ XmPciLpEvent_init(); return; } /* Called by iSeries_init_IRQ */ void __init iSeries_init_irqMap(int irq) { /* Prevent IRQs 0 and 255 from being used. IRQ 0 appears in uninitialized devices. IRQ 255 appears in the PCI interrupt line register if a PCI error occurs */ iSeries_irqMap[irq].valid = (irq == 0 || irq == 255)? 0 : 1; iSeries_irqMap[irq].entryCount = 0; iSeries_irqMap[irq].head = NULL; } /* This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot */ int __init iSeries_allocate_IRQ(HvBusNumber busNumber, HvSubBusNumber subBusNumber, HvAgentId deviceId) { u8 idsel = (deviceId >> 4); u8 function = deviceId & 0x0F; int irq = ((((busNumber-1)*16 + (idsel-1)*8 + function)*9/8) % 254) + 1; return irq; } /* This is called out of iSeries_scan_slot to assign the EADS slot to its IRQ number */ int __init iSeries_assign_IRQ(int irq, HvBusNumber busNumber, HvSubBusNumber subBusNumber, HvAgentId deviceId) { int rc; u32 dsa = (busNumber << 16) | (subBusNumber << 8) | deviceId; struct iSeries_irqEntry* newEntry; unsigned long flags; if (irq < 0 || irq >= NR_IRQS) return -1; newEntry = kmalloc(sizeof(*newEntry), GFP_KERNEL); if (newEntry == NULL) return -ENOMEM; newEntry->dsa = dsa; newEntry->next = NULL; /* Probably not necessary to lock the irq since allocation is only done during buswalk, but it should not hurt anything except a little performance */ spin_lock_irqsave(&irq_desc[irq].lock, flags); if (iSeries_irqMap[irq].valid) { /* Push the new element onto the irq stack */ newEntry->next = iSeries_irqMap[irq].head; iSeries_irqMap[irq].head = newEntry; ++iSeries_irqMap[irq].entryCount; rc = 0; } else rc = -1; spin_unlock_irqrestore(&irq_desc[irq].lock, flags); if (rc != 0 && newEntry) kfree(newEntry); return rc; } /* This is called by iSeries_activate_IRQs */ unsigned int iSeries_startup_IRQ(unsigned int irq) { struct iSeries_irqEntry* entry; u32 bus, subBus, deviceId, function, mask; /* irq should be locked by the caller */ for(entry=iSeries_irqMap[irq].head; entry!=NULL; entry=entry->next) { bus = (entry->dsa >> 16) & 0xFFFF; subBus = (entry->dsa >> 8) & 0xFF; deviceId = entry->dsa & 0xFF; function = deviceId & 0x0F; /* Link the IRQ number to the bridge */ HvCallXm_connectBusUnit(bus, subBus, deviceId, irq); /* Unmask bridge interrupts in the FISR */ mask = 0x01010000 << function; HvCallPci_unmaskFisr(bus, subBus, deviceId, mask); } return 0; } /* This is called out of iSeries_fixup to activate interrupt generation for usable slots */ void __init iSeries_activate_IRQs() { int irq; unsigned long flags; for (irq=0; irq < NR_IRQS; irq++) { spin_lock_irqsave(&irq_desc[irq].lock, flags); irq_desc[irq].handler->startup(irq); spin_unlock_irqrestore(&irq_desc[irq].lock, flags); } } /* this is not called anywhere currently */ void iSeries_shutdown_IRQ(unsigned int irq) { struct iSeries_irqEntry* entry; u32 bus, subBus, deviceId, function, mask; /* irq should be locked by the caller */ for(entry=iSeries_irqMap[irq].head; entry; entry=entry->next) { bus = (entry->dsa >> 16) & 0xFFFF; subBus = (entry->dsa >> 8) & 0xFF; deviceId = entry->dsa & 0xFF; function = deviceId & 0x0F; /* Invalidate the IRQ number in the bridge */ HvCallXm_connectBusUnit(bus, subBus, deviceId, 0); /* Mask bridge interrupts in the FISR */ mask = 0x01010000 << function; HvCallPci_maskFisr(bus, subBus, deviceId, mask); } } /* This will be called by device drivers (via disable_IRQ to disable INTA in the bridge interrupt status register */ void iSeries_disable_IRQ(unsigned int irq) { struct iSeries_irqEntry* entry; u32 bus, subBus, deviceId, mask; /* The IRQ has already been locked by the caller */ for(entry=iSeries_irqMap[irq].head; entry; entry=entry->next) { bus = (entry->dsa >> 16) & 0xFFFF; subBus = (entry->dsa >> 8) & 0xFF; deviceId = entry->dsa & 0xFF; /* Mask secondary INTA */ mask = 0x80000000; HvCallPci_maskInterrupts(bus, subBus, deviceId, mask); } } /* This will be called by device drivers (via enable_IRQ to enable INTA in the bridge interrupt status register */ void iSeries_enable_IRQ(unsigned int irq) { struct iSeries_irqEntry* entry; u32 bus, subBus, deviceId, mask; /* The IRQ has already been locked by the caller */ for(entry=iSeries_irqMap[irq].head; entry; entry=entry->next) { bus = (entry->dsa >> 16) & 0xFFFF; subBus = (entry->dsa >> 8) & 0xFF; deviceId = entry->dsa & 0xFF; /* Unmask secondary INTA */ mask = 0x80000000; HvCallPci_unmaskInterrupts(bus, subBus, deviceId, mask); } } /* Need to define this so ppc_irq_dispatch_handler will NOT call enable_IRQ at the end of interrupt handling. However, this does nothing because there is not enough information provided to do the EOI HvCall. This is done by XmPciLpEvent.c */ void iSeries_end_IRQ(unsigned int irq) { } |