powerpc: Move iSeries_irq.c to powerpc/platorms/iseries

And rename it to irq.c.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 365 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/iseries/irq.c b/arch/powerpc/platforms/iseries/irq.c
new file mode 100644
index 00000000000..5a8a0056b31
--- /dev/null
+++ b/arch/powerpc/platforms/iseries/irq.c
@@ -0,0 +1,365 @@
+/*
+ * 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/HvCallPci.h>
+#include <asm/iSeries/HvCallXm.h>
+#include <asm/iSeries/iSeries_irq.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;
+}