/*
* 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;
}
