arch/powerpc/platforms/iseries/irq.c - fp2-dev/kernel/msm - Gitiles

 /*
  * 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"

 enum pci_event_type {
 	pe_bus_created		= 0,	/* PHB has been created */
 	pe_bus_error		= 1,	/* PHB has failed */
 	pe_bus_failed		= 2,	/* Msg to Secondary, Primary failed bus */
 	pe_node_failed		= 4,	/* Multi-adapter bridge has failed */
 	pe_node_recovered	= 5,	/* Multi-adapter bridge has recovered */
 	pe_bus_recovered	= 12,	/* PHB has been recovered */
 	pe_unquiese_bus		= 18,	/* Secondary bus unqiescing */
 	pe_bridge_error		= 21,	/* Bridge Error */
 	pe_slot_interrupt	= 22	/* Slot interrupt */
 };

 struct pci_event {
 	struct HvLpEvent event;
 	union {
 		u64 __align;		/* Align on an 8-byte boundary */
 		struct {
 			u32		fisr;
 			HvBusNumber	bus_number;
 			HvSubBusNumber	sub_bus_number;
 			HvAgentId	dev_id;
 		} slot;
 		struct {
 			HvBusNumber	bus_number;
 			HvSubBusNumber	sub_bus_number;
 		} bus;
 		struct {
 			HvBusNumber	bus_number;
 			HvSubBusNumber	sub_bus_number;
 			HvAgentId	dev_id;
 		} node;
 	} data;
 };

 static void int_received(struct pci_event *event, struct pt_regs *regs)
 {
 	int irq;
 #ifdef CONFIG_IRQSTACKS
 	struct thread_info *curtp, *irqtp;
 #endif

 	switch (event->event.xSubtype) {
 	case pe_slot_interrupt:
 		irq = event->event.xCorrelationToken;
 		/* Dispatch the interrupt handlers for this irq */
 #ifdef CONFIG_IRQSTACKS
 		/* Switch to the irq stack to handle this */
 		curtp = current_thread_info();
 		irqtp = hardirq_ctx[smp_processor_id()];
 		if (curtp != irqtp) {
 			irqtp->task = curtp->task;
 			irqtp->flags = 0;
 			call___do_IRQ(irq, regs, irqtp);
 			irqtp->task = NULL;
 			if (irqtp->flags)
 				set_bits(irqtp->flags, &curtp->flags);
 		} else
 #endif
 			__do_IRQ(irq, regs);
 		HvCallPci_eoi(event->data.slot.bus_number,
 			event->data.slot.sub_bus_number,
 			event->data.slot.dev_id);
 		break;
 		/* Ignore error recovery events for now */
 	case pe_bus_created:
 		printk(KERN_INFO "int_received: system bus %d created\n",
 			event->data.bus.bus_number);
 		break;
 	case pe_bus_error:
 	case pe_bus_failed:
 		printk(KERN_INFO "int_received: system bus %d failed\n",
 			event->data.bus.bus_number);
 		break;
 	case pe_bus_recovered:
 	case pe_unquiese_bus:
 		printk(KERN_INFO "int_received: system bus %d recovered\n",
 			event->data.bus.bus_number);
 		break;
 	case pe_node_failed:
 	case pe_bridge_error:
 		printk(KERN_INFO
 			"int_received: multi-adapter bridge %d/%d/%d failed\n",
 			event->data.node.bus_number,
 			event->data.node.sub_bus_number,
 			event->data.node.dev_id);
 		break;
 	case pe_node_recovered:
 		printk(KERN_INFO
 			"int_received: multi-adapter bridge %d/%d/%d recovered\n",
 			event->data.node.bus_number,
 			event->data.node.sub_bus_number,
 			event->data.node.dev_id);
 		break;
 	default:
 		printk(KERN_ERR
 			"int_received: unrecognized event subtype 0x%x\n",
 			event->event.xSubtype);
 		break;
 	}
 }

 static void pci_event_handler(struct HvLpEvent *event, struct pt_regs *regs)
 {
 	if (event && (event->xType == HvLpEvent_Type_PciIo)) {
 		switch (event->xFlags.xFunction) {
 		case HvLpEvent_Function_Int:
 			int_received((struct pci_event *)event, regs);
 			break;
 		case HvLpEvent_Function_Ack:
 			printk(KERN_ERR
 				"pci_event_handler: unexpected ack received\n");
 			break;
 		default:
 			printk(KERN_ERR
 				"pci_event_handler: unexpected event function %d\n",
 				(int)event->xFlags.xFunction);
 			break;
 		}
 	} else if (event)
 		printk(KERN_ERR
 			"pci_event_handler: Unrecognized PCI event type 0x%x\n",
 			(int)event->xType);
 	else
 		printk(KERN_ERR "pci_event_handler: NULL event received\n");
 }

 /*
  * 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 ret;

 	ret = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo,
 			&pci_event_handler);
 	if (ret == 0) {
 		ret = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
 		if (ret != 0)
 			printk(KERN_ERR "iseries_init_IRQ: open event path "
 					"failed with rc 0x%x\n", ret);
 	} else
 		printk(KERN_ERR "iseries_init_IRQ: register handler "
 				"failed with rc 0x%x\n", ret);
 }

 #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, dev_id, function, mask;
 	const u32 sub_bus = 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);
 	dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

 	/* Unmask secondary INTA */
 	mask = 0x80000000;
 	HvCallPci_unmaskInterrupts(bus, sub_bus, dev_id, mask);
 }

 /* This is called by iseries_activate_IRQs */
 static unsigned int iseries_startup_IRQ(unsigned int irq)
 {
 	u32 bus, dev_id, function, mask;
 	const u32 sub_bus = 0;
 	unsigned int rirq = virt_irq_to_real_map[irq];

 	bus = REAL_IRQ_TO_BUS(rirq);
 	function = REAL_IRQ_TO_FUNC(rirq);
 	dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

 	/* Link the IRQ number to the bridge */
 	HvCallXm_connectBusUnit(bus, sub_bus, dev_id, irq);

 	/* Unmask bridge interrupts in the FISR */
 	mask = 0x01010000 << function;
 	HvCallPci_unmaskFisr(bus, sub_bus, dev_id, 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, dev_id, function, mask;
 	const u32 sub_bus = 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);
 	dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

 	/* Invalidate the IRQ number in the bridge */
 	HvCallXm_connectBusUnit(bus, sub_bus, dev_id, 0);

 	/* Mask bridge interrupts in the FISR */
 	mask = 0x01010000 << function;
 	HvCallPci_maskFisr(bus, sub_bus, dev_id, 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, dev_id, function, mask;
 	const u32 sub_bus = 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);
 	dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

 	/* Mask secondary INTA   */
 	mask = 0x80000000;
 	HvCallPci_maskInterrupts(bus, sub_bus, dev_id, mask);
 }

 /*
  * 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 sub_bus_number is always 0 (at the moment at least).
  */
 int __init iSeries_allocate_IRQ(HvBusNumber bus_number,
 		HvSubBusNumber sub_bus_number, HvAgentId dev_id)
 {
 	int virtirq;
 	unsigned int realirq;
 	u8 idsel = (dev_id >> 4);
 	u8 function = dev_id & 7;

 	realirq = ((bus_number - 1) << 6) + ((idsel - 1) << 3) + function;
 	virtirq = virt_irq_create_mapping(realirq);

 	irq_desc[virtirq].handler = &iSeries_IRQ_handler;
 	return virtirq;
 }
	/*
	* 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"

	enum pci_event_type {
	pe_bus_created = 0, /* PHB has been created */
	pe_bus_error = 1, /* PHB has failed */
	pe_bus_failed = 2, /* Msg to Secondary, Primary failed bus */
	pe_node_failed = 4, /* Multi-adapter bridge has failed */
	pe_node_recovered = 5, /* Multi-adapter bridge has recovered */
	pe_bus_recovered = 12, /* PHB has been recovered */
	pe_unquiese_bus = 18, /* Secondary bus unqiescing */
	pe_bridge_error = 21, /* Bridge Error */
	pe_slot_interrupt = 22 /* Slot interrupt */
	};

	struct pci_event {
	struct HvLpEvent event;
	union {
	u64 __align; /* Align on an 8-byte boundary */
	struct {
	u32 fisr;
	HvBusNumber bus_number;
	HvSubBusNumber sub_bus_number;
	HvAgentId dev_id;
	} slot;
	struct {
	HvBusNumber bus_number;
	HvSubBusNumber sub_bus_number;
	} bus;
	struct {
	HvBusNumber bus_number;
	HvSubBusNumber sub_bus_number;
	HvAgentId dev_id;
	} node;
	} data;
	};

	static void int_received(struct pci_event event, struct pt_regs regs)
	{
	int irq;
	#ifdef CONFIG_IRQSTACKS
	struct thread_info curtp, irqtp;
	#endif

	switch (event->event.xSubtype) {
	case pe_slot_interrupt:
	irq = event->event.xCorrelationToken;
	/* Dispatch the interrupt handlers for this irq */
	#ifdef CONFIG_IRQSTACKS
	/* Switch to the irq stack to handle this */
	curtp = current_thread_info();
	irqtp = hardirq_ctx[smp_processor_id()];
	if (curtp != irqtp) {
	irqtp->task = curtp->task;
	irqtp->flags = 0;
	call___do_IRQ(irq, regs, irqtp);
	irqtp->task = NULL;
	if (irqtp->flags)
	set_bits(irqtp->flags, &curtp->flags);
	} else
	#endif
	__do_IRQ(irq, regs);
	HvCallPci_eoi(event->data.slot.bus_number,
	event->data.slot.sub_bus_number,
	event->data.slot.dev_id);
	break;
	/* Ignore error recovery events for now */
	case pe_bus_created:
	printk(KERN_INFO "int_received: system bus %d created\n",
	event->data.bus.bus_number);
	break;
	case pe_bus_error:
	case pe_bus_failed:
	printk(KERN_INFO "int_received: system bus %d failed\n",
	event->data.bus.bus_number);
	break;
	case pe_bus_recovered:
	case pe_unquiese_bus:
	printk(KERN_INFO "int_received: system bus %d recovered\n",
	event->data.bus.bus_number);
	break;
	case pe_node_failed:
	case pe_bridge_error:
	printk(KERN_INFO
	"int_received: multi-adapter bridge %d/%d/%d failed\n",
	event->data.node.bus_number,
	event->data.node.sub_bus_number,
	event->data.node.dev_id);
	break;
	case pe_node_recovered:
	printk(KERN_INFO
	"int_received: multi-adapter bridge %d/%d/%d recovered\n",
	event->data.node.bus_number,
	event->data.node.sub_bus_number,
	event->data.node.dev_id);
	break;
	default:
	printk(KERN_ERR
	"int_received: unrecognized event subtype 0x%x\n",
	event->event.xSubtype);
	break;
	}
	}

	static void pci_event_handler(struct HvLpEvent event, struct pt_regs regs)
	{
	if (event && (event->xType == HvLpEvent_Type_PciIo)) {
	switch (event->xFlags.xFunction) {
	case HvLpEvent_Function_Int:
	int_received((struct pci_event *)event, regs);
	break;
	case HvLpEvent_Function_Ack:
	printk(KERN_ERR
	"pci_event_handler: unexpected ack received\n");
	break;
	default:
	printk(KERN_ERR
	"pci_event_handler: unexpected event function %d\n",
	(int)event->xFlags.xFunction);
	break;
	}
	} else if (event)
	printk(KERN_ERR
	"pci_event_handler: Unrecognized PCI event type 0x%x\n",
	(int)event->xType);
	else
	printk(KERN_ERR "pci_event_handler: NULL event received\n");
	}

	/*
	* 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 ret;

	ret = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo,
	&pci_event_handler);
	if (ret == 0) {
	ret = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
	if (ret != 0)
	printk(KERN_ERR "iseries_init_IRQ: open event path "
	"failed with rc 0x%x\n", ret);
	} else
	printk(KERN_ERR "iseries_init_IRQ: register handler "
	"failed with rc 0x%x\n", ret);
	}

	#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, dev_id, function, mask;
	const u32 sub_bus = 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);
	dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

	/* Unmask secondary INTA */
	mask = 0x80000000;
	HvCallPci_unmaskInterrupts(bus, sub_bus, dev_id, mask);
	}

	/* This is called by iseries_activate_IRQs */
	static unsigned int iseries_startup_IRQ(unsigned int irq)
	{
	u32 bus, dev_id, function, mask;
	const u32 sub_bus = 0;
	unsigned int rirq = virt_irq_to_real_map[irq];

	bus = REAL_IRQ_TO_BUS(rirq);
	function = REAL_IRQ_TO_FUNC(rirq);
	dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

	/* Link the IRQ number to the bridge */
	HvCallXm_connectBusUnit(bus, sub_bus, dev_id, irq);

	/* Unmask bridge interrupts in the FISR */
	mask = 0x01010000 << function;
	HvCallPci_unmaskFisr(bus, sub_bus, dev_id, 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, dev_id, function, mask;
	const u32 sub_bus = 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);
	dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

	/* Invalidate the IRQ number in the bridge */
	HvCallXm_connectBusUnit(bus, sub_bus, dev_id, 0);

	/* Mask bridge interrupts in the FISR */
	mask = 0x01010000 << function;
	HvCallPci_maskFisr(bus, sub_bus, dev_id, 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, dev_id, function, mask;
	const u32 sub_bus = 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);
	dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

	/* Mask secondary INTA */
	mask = 0x80000000;
	HvCallPci_maskInterrupts(bus, sub_bus, dev_id, mask);
	}

	/*
	* 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 sub_bus_number is always 0 (at the moment at least).
	*/
	int __init iSeries_allocate_IRQ(HvBusNumber bus_number,
	HvSubBusNumber sub_bus_number, HvAgentId dev_id)
	{
	int virtirq;
	unsigned int realirq;
	u8 idsel = (dev_id >> 4);
	u8 function = dev_id & 7;

	realirq = ((bus_number - 1) << 6) + ((idsel - 1) << 3) + function;
	virtirq = virt_irq_create_mapping(realirq);

	irq_desc[virtirq].handler = &iSeries_IRQ_handler;
	return virtirq;
	}