[mirror_ubuntu-zesty-kernel.git] / arch / powerpc / platforms / iseries / irq.c

/*
 * 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/iseries/hv_types.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iseries/hv_call_xm.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);
}

/* 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);
}

/*
 * 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;
}
Commit	Line	Data
0c3b4f1a SR	1	/*
	2	* This module supports the iSeries PCI bus interrupt handling
	3	* Copyright (C) 20yy <Robert L Holtorf> <IBM Corp>
89ef68f0	4	* Copyright (C) 2004-2005 IBM Corporation
0c3b4f1a SR	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	*/
89ef68f0	26	#include <linux/config.h>
1da177e4 LT	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>
1da177e4 LT	35	#include <linux/irq.h>
1da177e4 LT	36	#include <linux/spinlock.h>
1da177e4	37
1ec65d76	38	#include <asm/iseries/hv_types.h>
e45423ea	39	#include <asm/iseries/hv_lp_event.h>
8021b8a7	40	#include <asm/iseries/hv_call_xm.h>
b08567cb SR	41
b08567cb SR	42	#include "irq.h"
c6d2ea92	43	#include "call_pci.h"
1da177e4 LT	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
89ef68f0 SR	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;
89ef68f0 SR	108
	109	switch (eventParm->hvLpEvent.xSubtype) {
	110	case XmPciLpEvent_SlotInterrupt:
	111	irq = eventParm->hvLpEvent.xCorrelationToken;
	112	/* Dispatch the interrupt handlers for this irq */
	113	ppc_irq_dispatch_handler(regsParm, irq);
	114	HvCallPci_eoi(eventParm->eventData.slotInterrupt.busNumber,
	115	eventParm->eventData.slotInterrupt.subBusNumber,
	116	eventParm->eventData.slotInterrupt.deviceId);
	117	break;
	118	/* Ignore error recovery events for now */
	119	case XmPciLpEvent_BusCreated:
7f74e79f	120	printk(KERN_INFO "intReceived: system bus %d created\n",
89ef68f0 SR	121	eventParm->eventData.busCreated.busNumber);
	122	break;
	123	case XmPciLpEvent_BusError:
	124	case XmPciLpEvent_BusFailed:
7f74e79f	125	printk(KERN_INFO "intReceived: system bus %d failed\n",
89ef68f0 SR	126	eventParm->eventData.busFailed.busNumber);
	127	break;
	128	case XmPciLpEvent_BusRecovered:
	129	case XmPciLpEvent_UnQuiesceBus:
7f74e79f	130	printk(KERN_INFO "intReceived: system bus %d recovered\n",
89ef68f0 SR	131	eventParm->eventData.busRecovered.busNumber);
	132	break;
	133	case XmPciLpEvent_NodeFailed:
	134	case XmPciLpEvent_BridgeError:
	135	printk(KERN_INFO
7f74e79f	136	"intReceived: multi-adapter bridge %d/%d/%d failed\n",
89ef68f0 SR	137	eventParm->eventData.nodeFailed.busNumber,
	138	eventParm->eventData.nodeFailed.subBusNumber,
	139	eventParm->eventData.nodeFailed.deviceId);
	140	break;
	141	case XmPciLpEvent_NodeRecovered:
	142	printk(KERN_INFO
7f74e79f	143	"intReceived: multi-adapter bridge %d/%d/%d recovered\n",
89ef68f0 SR	144	eventParm->eventData.nodeRecovered.busNumber,
	145	eventParm->eventData.nodeRecovered.subBusNumber,
	146	eventParm->eventData.nodeRecovered.deviceId);
	147	break;
	148	default:
	149	printk(KERN_ERR
7f74e79f	150	"intReceived: unrecognized event subtype 0x%x\n",
89ef68f0 SR	151	eventParm->hvLpEvent.xSubtype);
	152	break;
	153	}
	154	}
	155
	156	static void XmPciLpEvent_handler(struct HvLpEvent *eventParm,
	157	struct pt_regs *regsParm)
	158	{
	159	#ifdef CONFIG_PCI
89ef68f0 SR	160	++Pci_Event_Count;
	161
	162	if (eventParm && (eventParm->xType == HvLpEvent_Type_PciIo)) {
	163	switch (eventParm->xFlags.xFunction) {
	164	case HvLpEvent_Function_Int:
	165	intReceived((struct XmPciLpEvent *)eventParm, regsParm);
	166	break;
	167	case HvLpEvent_Function_Ack:
	168	printk(KERN_ERR
7f74e79f	169	"XmPciLpEvent_handler: unexpected ack received\n");
89ef68f0 SR	170	break;
	171	default:
	172	printk(KERN_ERR
7f74e79f	173	"XmPciLpEvent_handler: unexpected event function %d\n",
89ef68f0 SR	174	(int)eventParm->xFlags.xFunction);
	175	break;
	176	}
	177	} else if (eventParm)
	178	printk(KERN_ERR
7f74e79f	179	"XmPciLpEvent_handler: Unrecognized PCI event type 0x%x\n",
89ef68f0 SR	180	(int)eventParm->xType);
89ef68f0 SR	181	else
7f74e79f	182	printk(KERN_ERR "XmPciLpEvent_handler: NULL event received\n");
89ef68f0 SR	183	#endif
	184	}
	185
7f74e79f SR	186	/*
	187	* This is called by init_IRQ. set in ppc_md.init_IRQ by iSeries_setup.c
	188	* It must be called before the bus walk.
	189	*/
	190	void __init iSeries_init_IRQ(void)
89ef68f0	191	{
7f74e79f	192	/* Register PCI event handler and open an event path */
89ef68f0 SR	193	int xRc;
89ef68f0 SR	194
89ef68f0 SR	195	xRc = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo,
	196	&XmPciLpEvent_handler);
	197	if (xRc == 0) {
	198	xRc = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
	199	if (xRc != 0)
7f74e79f	200	printk(KERN_ERR "iSeries_init_IRQ: open event path "
89ef68f0 SR	201	"failed with rc 0x%x\n", xRc);
89ef68f0 SR	202	} else
7f74e79f	203	printk(KERN_ERR "iSeries_init_IRQ: register handler "
89ef68f0	204	"failed with rc 0x%x\n", xRc);
1da177e4 LT	205	}
1da177e4 LT	206
0c3b4f1a SR	207	#define REAL_IRQ_TO_BUS(irq) ((((irq) >> 6) & 0xff) + 1)
	208	#define REAL_IRQ_TO_IDSEL(irq) ((((irq) >> 3) & 7) + 1)
	209	#define REAL_IRQ_TO_FUNC(irq) ((irq) & 7)
	210
1da177e4	211	/*
0c3b4f1a SR	212	* This will be called by device drivers (via enable_IRQ)
0c3b4f1a SR	213	* to enable INTA in the bridge interrupt status register.
1da177e4	214	*/
0c3b4f1a	215	static void iSeries_enable_IRQ(unsigned int irq)
1da177e4	216	{
0c3b4f1a SR	217	u32 bus, deviceId, function, mask;
	218	const u32 subBus = 0;
	219	unsigned int rirq = virt_irq_to_real_map[irq];
1da177e4	220
0c3b4f1a SR	221	/* The IRQ has already been locked by the caller */
	222	bus = REAL_IRQ_TO_BUS(rirq);
	223	function = REAL_IRQ_TO_FUNC(rirq);
	224	deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
1da177e4	225
0c3b4f1a SR	226	/* Unmask secondary INTA */
	227	mask = 0x80000000;
	228	HvCallPci_unmaskInterrupts(bus, subBus, deviceId, mask);
1da177e4 LT	229	}
1da177e4 LT	230
1da177e4 LT	231	/* This is called by iSeries_activate_IRQs */
	232	static unsigned int iSeries_startup_IRQ(unsigned int irq)
	233	{
	234	u32 bus, deviceId, function, mask;
	235	const u32 subBus = 0;
	236	unsigned int rirq = virt_irq_to_real_map[irq];
	237
	238	bus = REAL_IRQ_TO_BUS(rirq);
	239	function = REAL_IRQ_TO_FUNC(rirq);
	240	deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
	241
	242	/* Link the IRQ number to the bridge */
	243	HvCallXm_connectBusUnit(bus, subBus, deviceId, irq);
	244
	245	/* Unmask bridge interrupts in the FISR */
	246	mask = 0x01010000 << function;
	247	HvCallPci_unmaskFisr(bus, subBus, deviceId, mask);
	248	iSeries_enable_IRQ(irq);
	249	return 0;
	250	}
	251
	252	/*
	253	* This is called out of iSeries_fixup to activate interrupt
	254	* generation for usable slots
	255	*/
	256	void __init iSeries_activate_IRQs()
	257	{
	258	int irq;
	259	unsigned long flags;
	260
	261	for_each_irq (irq) {
	262	irq_desc_t *desc = get_irq_desc(irq);
	263
	264	if (desc && desc->handler && desc->handler->startup) {
	265	spin_lock_irqsave(&desc->lock, flags);
	266	desc->handler->startup(irq);
	267	spin_unlock_irqrestore(&desc->lock, flags);
	268	}
0c3b4f1a	269	}
1da177e4 LT	270	}
	271
	272	/* this is not called anywhere currently */
	273	static void iSeries_shutdown_IRQ(unsigned int irq)
	274	{
	275	u32 bus, deviceId, function, mask;
	276	const u32 subBus = 0;
	277	unsigned int rirq = virt_irq_to_real_map[irq];
	278
	279	/* irq should be locked by the caller */
	280	bus = REAL_IRQ_TO_BUS(rirq);
	281	function = REAL_IRQ_TO_FUNC(rirq);
	282	deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
	283
	284	/* Invalidate the IRQ number in the bridge */
	285	HvCallXm_connectBusUnit(bus, subBus, deviceId, 0);
	286
	287	/* Mask bridge interrupts in the FISR */
	288	mask = 0x01010000 << function;
	289	HvCallPci_maskFisr(bus, subBus, deviceId, mask);
	290	}
	291
	292	/*
	293	* This will be called by device drivers (via disable_IRQ)
	294	* to disable INTA in the bridge interrupt status register.
	295	*/
	296	static void iSeries_disable_IRQ(unsigned int irq)
	297	{
	298	u32 bus, deviceId, function, mask;
	299	const u32 subBus = 0;
	300	unsigned int rirq = virt_irq_to_real_map[irq];
	301
	302	/* The IRQ has already been locked by the caller */
	303	bus = REAL_IRQ_TO_BUS(rirq);
	304	function = REAL_IRQ_TO_FUNC(rirq);
	305	deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
	306
	307	/* Mask secondary INTA */
	308	mask = 0x80000000;
	309	HvCallPci_maskInterrupts(bus, subBus, deviceId, mask);
1da177e4 LT	310	}
	311
	312	/*
	313	* Need to define this so ppc_irq_dispatch_handler will NOT call
	314	* enable_IRQ at the end of interrupt handling. However, this does
	315	* nothing because there is not enough information provided to do
	316	* the EOI HvCall. This is done by XmPciLpEvent.c
	317	*/
	318	static void iSeries_end_IRQ(unsigned int irq)
	319	{
	320	}
0c3b4f1a SR	321
	322	static hw_irq_controller iSeries_IRQ_handler = {
	323	.typename = "iSeries irq controller",
	324	.startup = iSeries_startup_IRQ,
	325	.shutdown = iSeries_shutdown_IRQ,
	326	.enable = iSeries_enable_IRQ,
	327	.disable = iSeries_disable_IRQ,
	328	.end = iSeries_end_IRQ
	329	};
	330
	331	/*
	332	* This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot
	333	* It calculates the irq value for the slot.
	334	* Note that subBusNumber is always 0 (at the moment at least).
	335	*/
	336	int __init iSeries_allocate_IRQ(HvBusNumber busNumber,
	337	HvSubBusNumber subBusNumber, HvAgentId deviceId)
	338	{
	339	unsigned int realirq, virtirq;
	340	u8 idsel = (deviceId >> 4);
	341	u8 function = deviceId & 7;
	342
	343	virtirq = next_virtual_irq++;
	344	realirq = ((busNumber - 1) << 6) + ((idsel - 1) << 3) + function;
	345	virt_irq_to_real_map[virtirq] = realirq;
	346
	347	irq_desc[virtirq].handler = &iSeries_IRQ_handler;
	348	return virtirq;
	349	}
ba293fff ME	350
	351	int virt_irq_create_mapping(unsigned int real_irq)
	352	{
	353	BUG(); /* Don't call this on iSeries, yet */
	354
	355	return 0;
	356	}
	357
	358	void virt_irq_init(void)
	359	{
	360	return;
	361	}