1 files changed, 366 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/iseries/irq.c b/arch/powerpc/platforms/iseries/irq.c
new file mode 100644
index 000000000000..937ac99b9d33
--- /dev/null
+++ b/arch/powerpc/platforms/iseries/irq.c
@@ -0,0 +1,366 @@
+/*
+ * This module supports the iSeries PCI bus interrupt handling
+ * Copyright (C) 20yy  <Robert L Holtorf> <IBM Corp>
+ * Copyright (C) 2004-2005 IBM Corporation
+ *
+ * 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/config.h>
+#include <linux/pci.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/ide.h>
+#include <linux/irq.h>
+#include <linux/spinlock.h>
+
+#include <asm/ppcdebug.h>
+#include <asm/iSeries/HvTypes.h>
+#include <asm/iSeries/HvLpEvent.h>
+#include <asm/iSeries/HvCallXm.h>
+
+#include "irq.h"
+#include "call_pci.h"
+
+/* This maps virtual irq numbers to real irqs */
+unsigned int virt_irq_to_real_map[NR_IRQS];
+
+/* The next available virtual irq number */
+/* Note: the pcnet32 driver assumes irq numbers < 2 aren't valid. :( */
+static int next_virtual_irq = 2;
+
+static long Pci_Interrupt_Count;
+static long Pci_Event_Count;
+
+enum XmPciLpEvent_Subtype {
+        XmPciLpEvent_BusCreated         = 0,    // PHB has been created
+        XmPciLpEvent_BusError           = 1,    // PHB has failed
+        XmPciLpEvent_BusFailed          = 2,    // Msg to Secondary, Primary failed bus
+        XmPciLpEvent_NodeFailed         = 4,    // Multi-adapter bridge has failed
+        XmPciLpEvent_NodeRecovered      = 5,    // Multi-adapter bridge has recovered
+        XmPciLpEvent_BusRecovered       = 12,   // PHB has been recovered
+        XmPciLpEvent_UnQuiesceBus       = 18,   // Secondary bus unqiescing
+        XmPciLpEvent_BridgeError        = 21,   // Bridge Error
+        XmPciLpEvent_SlotInterrupt      = 22    // Slot interrupt
+};
+
+struct XmPciLpEvent_BusInterrupt {
+        HvBusNumber     busNumber;
+        HvSubBusNumber  subBusNumber;
+};
+
+struct XmPciLpEvent_NodeInterrupt {
+        HvBusNumber     busNumber;
+        HvSubBusNumber  subBusNumber;
+        HvAgentId       deviceId;
+};
+
+struct XmPciLpEvent {
+        struct HvLpEvent hvLpEvent;
+
+        union {
+                u64 alignData;                  // Align on an 8-byte boundary
+
+                struct {
+                        u32             fisr;
+                        HvBusNumber     busNumber;
+                        HvSubBusNumber  subBusNumber;
+                        HvAgentId       deviceId;
+                } slotInterrupt;
+
+                struct XmPciLpEvent_BusInterrupt busFailed;
+                struct XmPciLpEvent_BusInterrupt busRecovered;
+                struct XmPciLpEvent_BusInterrupt busCreated;
+
+                struct XmPciLpEvent_NodeInterrupt nodeFailed;
+                struct XmPciLpEvent_NodeInterrupt nodeRecovered;
+
+        } eventData;
+
+};
+
+static void intReceived(struct XmPciLpEvent *eventParm,
+                struct pt_regs *regsParm)
+{
+        int irq;
+
+        ++Pci_Interrupt_Count;
+
+        switch (eventParm->hvLpEvent.xSubtype) {
+        case XmPciLpEvent_SlotInterrupt:
+                irq = eventParm->hvLpEvent.xCorrelationToken;
+                /* Dispatch the interrupt handlers for this irq */
+                ppc_irq_dispatch_handler(regsParm, irq);
+                HvCallPci_eoi(eventParm->eventData.slotInterrupt.busNumber,
+                        eventParm->eventData.slotInterrupt.subBusNumber,
+                        eventParm->eventData.slotInterrupt.deviceId);
+                break;
+                /* Ignore error recovery events for now */
+        case XmPciLpEvent_BusCreated:
+                printk(KERN_INFO "intReceived: system bus %d created\n",
+                        eventParm->eventData.busCreated.busNumber);
+                break;
+        case XmPciLpEvent_BusError:
+        case XmPciLpEvent_BusFailed:
+                printk(KERN_INFO "intReceived: system bus %d failed\n",
+                        eventParm->eventData.busFailed.busNumber);
+                break;
+        case XmPciLpEvent_BusRecovered:
+        case XmPciLpEvent_UnQuiesceBus:
+                printk(KERN_INFO "intReceived: system bus %d recovered\n",
+                        eventParm->eventData.busRecovered.busNumber);
+                break;
+        case XmPciLpEvent_NodeFailed:
+        case XmPciLpEvent_BridgeError:
+                printk(KERN_INFO
+                        "intReceived: multi-adapter bridge %d/%d/%d failed\n",
+                        eventParm->eventData.nodeFailed.busNumber,
+                        eventParm->eventData.nodeFailed.subBusNumber,
+                        eventParm->eventData.nodeFailed.deviceId);
+                break;
+        case XmPciLpEvent_NodeRecovered:
+                printk(KERN_INFO
+                        "intReceived: multi-adapter bridge %d/%d/%d recovered\n",
+                        eventParm->eventData.nodeRecovered.busNumber,
+                        eventParm->eventData.nodeRecovered.subBusNumber,
+                        eventParm->eventData.nodeRecovered.deviceId);
+                break;
+        default:
+                printk(KERN_ERR
+                        "intReceived: unrecognized event subtype 0x%x\n",
+                        eventParm->hvLpEvent.xSubtype);
+                break;
+        }
+}
+
+static void XmPciLpEvent_handler(struct HvLpEvent *eventParm,
+                struct pt_regs *regsParm)
+{
+#ifdef CONFIG_PCI
+        ++Pci_Event_Count;
+
+        if (eventParm && (eventParm->xType == HvLpEvent_Type_PciIo)) {
+                switch (eventParm->xFlags.xFunction) {
+                case HvLpEvent_Function_Int:
+                        intReceived((struct XmPciLpEvent *)eventParm, regsParm);
+                        break;
+                case HvLpEvent_Function_Ack:
+                        printk(KERN_ERR
+                                "XmPciLpEvent_handler: unexpected ack received\n");
+                        break;
+                default:
+                        printk(KERN_ERR
+                                "XmPciLpEvent_handler: unexpected event function %d\n",
+                                (int)eventParm->xFlags.xFunction);
+                        break;
+                }
+        } else if (eventParm)
+                printk(KERN_ERR
+                        "XmPciLpEvent_handler: Unrecognized PCI event type 0x%x\n",
+                        (int)eventParm->xType);
+        else
+                printk(KERN_ERR "XmPciLpEvent_handler: NULL event received\n");
+#endif
+}
+
+/*
+ * This is called by init_IRQ.  set in ppc_md.init_IRQ by iSeries_setup.c
+ * It must be called before the bus walk.
+ */
+void __init iSeries_init_IRQ(void)
+{
+        /* Register PCI event handler and open an event path */
+        int xRc;
+
+        xRc = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo,
+                        &XmPciLpEvent_handler);
+        if (xRc == 0) {
+                xRc = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
+                if (xRc != 0)
+                        printk(KERN_ERR "iSeries_init_IRQ: open event path "
+                                        "failed with rc 0x%x\n", xRc);
+        } else
+                printk(KERN_ERR "iSeries_init_IRQ: register handler "
+                                "failed with rc 0x%x\n", xRc);
+}
+
+#define REAL_IRQ_TO_BUS(irq)    ((((irq) >> 6) & 0xff) + 1)
+#define REAL_IRQ_TO_IDSEL(irq)  ((((irq) >> 3) & 7) + 1)
+#define REAL_IRQ_TO_FUNC(irq)   ((irq) & 7)
+
+/*
+ * This will be called by device drivers (via enable_IRQ)
+ * to enable INTA in the bridge interrupt status register.
+ */
+static void iSeries_enable_IRQ(unsigned int irq)
+{
+        u32 bus, deviceId, function, mask;
+        const u32 subBus = 0;
+        unsigned int rirq = virt_irq_to_real_map[irq];
+
+        /* The IRQ has already been locked by the caller */
+        bus = REAL_IRQ_TO_BUS(rirq);
+        function = REAL_IRQ_TO_FUNC(rirq);
+        deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
+
+        /* Unmask secondary INTA */
+        mask = 0x80000000;
+        HvCallPci_unmaskInterrupts(bus, subBus, deviceId, mask);
+        PPCDBG(PPCDBG_BUSWALK, "iSeries_enable_IRQ 0x%02X.%02X.%02X 0x%04X\n",
+                        bus, subBus, deviceId, irq);
+}
+
+/* This is called by iSeries_activate_IRQs */
+static unsigned int iSeries_startup_IRQ(unsigned int irq)
+{
+        u32 bus, deviceId, function, mask;
+        const u32 subBus = 0;
+        unsigned int rirq = virt_irq_to_real_map[irq];
+
+        bus = REAL_IRQ_TO_BUS(rirq);
+        function = REAL_IRQ_TO_FUNC(rirq);
+        deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
+
+        /* 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);
+        iSeries_enable_IRQ(irq);
+        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_each_irq (irq) {
+                irq_desc_t *desc = get_irq_desc(irq);
+
+                if (desc && desc->handler && desc->handler->startup) {
+                        spin_lock_irqsave(&desc->lock, flags);
+                        desc->handler->startup(irq);
+                        spin_unlock_irqrestore(&desc->lock, flags);
+                }
+        }
+}
+
+/*  this is not called anywhere currently */
+static void iSeries_shutdown_IRQ(unsigned int irq)
+{
+        u32 bus, deviceId, function, mask;
+        const u32 subBus = 0;
+        unsigned int rirq = virt_irq_to_real_map[irq];
+
+        /* irq should be locked by the caller */
+        bus = REAL_IRQ_TO_BUS(rirq);
+        function = REAL_IRQ_TO_FUNC(rirq);
+        deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
+
+        /* 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.
+ */
+static void iSeries_disable_IRQ(unsigned int irq)
+{
+        u32 bus, deviceId, function, mask;
+        const u32 subBus = 0;
+        unsigned int rirq = virt_irq_to_real_map[irq];
+
+        /* The IRQ has already been locked by the caller */
+        bus = REAL_IRQ_TO_BUS(rirq);
+        function = REAL_IRQ_TO_FUNC(rirq);
+        deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
+
+        /* Mask secondary INTA   */
+        mask = 0x80000000;
+        HvCallPci_maskInterrupts(bus, subBus, deviceId, mask);
+        PPCDBG(PPCDBG_BUSWALK, "iSeries_disable_IRQ 0x%02X.%02X.%02X 0x%04X\n",
+                        bus, subBus, deviceId, irq);
+}
+
+/*
+ * 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
+ */
+static void iSeries_end_IRQ(unsigned int irq)
+{
+}
+
+static hw_irq_controller iSeries_IRQ_handler = {
+        .typename = "iSeries irq controller",
+        .startup = iSeries_startup_IRQ,
+        .shutdown = iSeries_shutdown_IRQ,
+        .enable = iSeries_enable_IRQ,
+        .disable = iSeries_disable_IRQ,
+        .end = iSeries_end_IRQ
+};
+
+/*
+ * This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot
+ * It calculates the irq value for the slot.
+ * Note that subBusNumber is always 0 (at the moment at least).
+ */
+int __init iSeries_allocate_IRQ(HvBusNumber busNumber,
+                HvSubBusNumber subBusNumber, HvAgentId deviceId)
+{
+        unsigned int realirq, virtirq;
+        u8 idsel = (deviceId >> 4);
+        u8 function = deviceId & 7;
+
+        virtirq = next_virtual_irq++;
+        realirq = ((busNumber - 1) << 6) + ((idsel - 1) << 3) + function;
+        virt_irq_to_real_map[virtirq] = realirq;
+
+        irq_desc[virtirq].handler = &iSeries_IRQ_handler;
+        return virtirq;
+}
+
+int virt_irq_create_mapping(unsigned int real_irq)
+{
+        BUG(); /* Don't call this on iSeries, yet */
+
+        return 0;
+}
+
+void virt_irq_init(void)
+{
+        return;
+}