/*
* Platform dependent support for SGI SN
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
*/
#include <linux/irq.h>
#include <asm/sn/intr.h>
#include <asm/sn/addrs.h>
#include <asm/sn/arch.h>
#include "xtalk/xwidgetdev.h"
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/pcidev.h>
#include "pci/pcibr_provider.h"
#include <asm/sn/shub_mmr.h>
#include <asm/sn/sn_sal.h>
static void force_interrupt(int irq);
static void register_intr_pda(struct sn_irq_info *sn_irq_info);
static void unregister_intr_pda(struct sn_irq_info *sn_irq_info);
extern int sn_force_interrupt_flag;
extern int sn_ioif_inited;
struct sn_irq_info **sn_irq;
static inline uint64_t sn_intr_alloc(nasid_t local_nasid, int local_widget,
u64 sn_irq_info,
int req_irq, nasid_t req_nasid,
int req_slice)
{
struct ia64_sal_retval ret_stuff;
ret_stuff.status = 0;
ret_stuff.v0 = 0;
SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
(u64) SAL_INTR_ALLOC, (u64) local_nasid,
(u64) local_widget, (u64) sn_irq_info, (u64) req_irq,
(u64) req_nasid, (u64) req_slice);
return ret_stuff.status;
}
static inline void sn_intr_free(nasid_t local_nasid, int local_widget,
struct sn_irq_info *sn_irq_info)
{
struct ia64_sal_retval ret_stuff;
ret_stuff.status = 0;
ret_stuff.v0 = 0;
SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
(u64) SAL_INTR_FREE, (u64) local_nasid,
(u64) local_widget, (u64) sn_irq_info->irq_irq,
(u64) sn_irq_info->irq_cookie, 0, 0);
}
static unsigned int sn_startup_irq(unsigned int irq)
{
return 0;
}
static void sn_shutdown_irq(unsigned int irq)
{
}
static void sn_disable_irq(unsigned int irq)
{
}
static void sn_enable_irq(unsigned int irq)
{
}
static void sn_ack_irq(unsigned int irq)
{
uint64_t event_occurred, mask = 0;
int nasid;
irq = irq & 0xff;
nasid = get_nasid();
event_occurred =
HUB_L((uint64_t *) GLOBAL_MMR_ADDR(nasid, SH_EVENT_OCCURRED));
mask = event_occurred & SH_ALL_INT_MASK;
HUB_S((uint64_t *) GLOBAL_MMR_ADDR(nasid, SH_EVENT_OCCURRED_ALIAS),
mask);
__set_bit(irq, (volatile void *)pda->sn_in_service_ivecs);
move_irq(irq);
}
static void sn_end_irq(unsigned int irq)
{
int nasid;
int ivec;
uint64_t event_occurred;
ivec = irq & 0xff;
if (ivec == SGI_UART_VECTOR) {
nasid = get_nasid();
event_occurred = HUB_L((uint64_t *) GLOBAL_MMR_ADDR
(nasid, SH_EVENT_OCCURRED));
/* If the UART bit is set here, we may have received an
* interrupt from the UART that the driver missed. To
* make sure, we IPI ourselves to force us to look again.
*/
if (event_occurred & SH_EVENT_OCCURRED_UART_INT_MASK) {
platform_send_ipi(smp_processor_id(), SGI_UART_VECTOR,
IA64_IPI_DM_INT, 0);
}
}
__clear_bit(ivec, (volatile void *)pda->sn_in_service_ivecs);
if (sn_force_interrupt_flag)
force_interrupt(irq);
}
static void sn_set_affinity_irq(unsigned int irq, cpumask_t mask)
{
struct sn_irq_info *sn_irq_info = sn_irq[irq];
struct sn_irq_info *tmp_sn_irq_info;
int cpuid, cpuphys;
nasid_t t_nasid; /* nasid to target */
int t_slice; /* slice to target */
/* allocate a temp sn_irq_info struct to get new target info */
tmp_sn_irq_info = kmalloc(sizeof(*tmp_sn_irq_info), GFP_KERNEL);
if (!tmp_sn_irq_info)
return;
cpuid = first_cpu(mask);
cpuphys = cpu_physical_id(cpuid);
t_nasid = cpuid_to_nasid(cpuid);
t_slice = cpuid_to_slice(cpuid);
while (sn_irq_info) {
int status;
int local_widget;
uint64_t bridge = (uint64_t) sn_irq_info->irq_bridge;
nasid_t local_nasid = NASID_GET(bridge);
if (!bridge)
break; /* irq is not a device interrupt */
if (local_nasid & 1)
local_widget = TIO_SWIN_WIDGETNUM(bridge);
else
local_widget = SWIN_WIDGETNUM(bridge);
/* Free the old PROM sn_irq_info structure */
sn_intr_free(local_nasid, local_widget, sn_irq_info);
/* allocate a new PROM sn_irq_info struct */
status = sn_intr_alloc(local_nasid, local_widget,
__pa(tmp_sn_irq_info), irq, t_nasid,
t_slice);
if (status == 0) {
/* Update kernels sn_irq_info with new target info */
unregister_intr_pda(sn_irq_info);
sn_irq_info->irq_cpuid = cpuid;
sn_irq_info->irq_nasid = t_nasid;
sn_irq_info->irq_slice = t_slice;
sn_irq_info->irq_xtalkaddr =
tmp_sn_irq_info->irq_xtalkaddr;
sn_irq_info->irq_cookie = tmp_sn_irq_info->irq_cookie;
register_intr_pda(sn_irq_info);
if (IS_PCI_BRIDGE_ASIC(sn_irq_info->irq_bridge_type)) {
pcibr_change_devices_irq(sn_irq_info);
}
sn_irq_info = sn_irq_info->irq_next;
#ifdef CONFIG_SMP
set_irq_affinity_info((irq & 0xff), cpuphys, 0);
#endif
} else {
break; /* snp_affinity failed the intr_alloc */
}
}
kfree(tmp_sn_irq_info);
}
struct hw_interrupt_type irq_type_sn = {
"SN hub",
sn_startup_irq,
sn_shutdown_irq,
sn_enable_irq,
sn_disable_irq,
sn_ack_irq,
sn_end_irq,
sn_set_affinity_irq
};
unsigned int sn_local_vector_to_irq(u8 vector)
{
return (CPU_VECTOR_TO_IRQ(smp_processor_id(), vector));
}
void sn_irq_init(void)
{
int i;
irq_desc_t *base_desc = irq_desc;
for (i = 0; i < NR_IRQS; i++) {
if (base_desc[i].handler == &no_irq_type) {
base_desc[i].handler = &irq_type_sn;
}
}
}
static void register_intr_pda(struct sn_irq_info *sn_irq_info)
{
int irq = sn_irq_info->irq_irq;
int cpu = sn_irq_info->irq_cpuid;
if (pdacpu(cpu)->sn_last_irq < irq) {
pdacpu(cpu)->sn_last_irq = irq;
}
if (pdacpu(cpu)->sn_first_irq == 0 || pdacpu(cpu)->sn_first_irq > irq) {
pdacpu(cpu)->sn_first_irq = irq;
}
}
static void unregister_intr_pda(struct sn_irq_info *sn_irq_info)
{
int irq = sn_irq_info->irq_irq;
int cpu = sn_irq_info->irq_cpuid;
struct sn_irq_info *tmp_irq_info;
int i, foundmatch;
if (pdacpu(cpu)->sn_last_irq == irq) {
foundmatch = 0;
for (i = pdacpu(cpu)->sn_last_irq - 1; i; i--) {
tmp_irq_info = sn_irq[i];
while (tmp_irq_info) {
if (tmp_irq_info->irq_cpuid == cpu) {
foundmatch++;
break;
}
tmp_irq_info = tmp_irq_info->irq_next;
}
if (foundmatch) {
break;
}
}
pdacpu(cpu)->sn_last_irq = i;
}
if (pdacpu(cpu)->sn_first_irq == irq) {
foundmatch = 0;
for (i = pdacpu(cpu)->sn_first_irq + 1; i < NR_IRQS; i++) {
tmp_irq_info = sn_irq[i];
while (tmp_irq_info) {
if (tmp_irq_info->irq_cpuid == cpu) {
foundmatch++;
break;
}
tmp_irq_info = tmp_irq_info->irq_next;
}
if (foundmatch) {
break;
}
}
pdacpu(cpu)->sn_first_irq = ((i == NR_IRQS) ? 0 : i);
}
}
struct sn_irq_info *sn_irq_alloc(nasid_t local_nasid, int local_widget, int irq,
nasid_t nasid, int slice)
{
struct sn_irq_info *sn_irq_info;
int status;
sn_irq_info = kmalloc(sizeof(*sn_irq_info), GFP_KERNEL);
if (sn_irq_info == NULL)
return NULL;
memset(sn_irq_info, 0x0, sizeof(*sn_irq_info));
status =
sn_intr_alloc(local_nasid, local_widget, __pa(sn_irq_info), irq,
nasid, slice);
if (status) {
kfree(sn_irq_info);
return NULL;
} else {
return sn_irq_info;
}
}
void sn_irq_free(struct sn_irq_info *sn_irq_info)
{
uint64_t bridge = (uint64_t) sn_irq_info->irq_bridge;
nasid_t local_nasid = NASID_GET(bridge);
int local_widget;
if (local_nasid & 1) /* tio check */
local_widget = TIO_SWIN_WIDGETNUM(bridge);
else
local_widget = SWIN_WIDGETNUM(bridge);
sn_intr_free(local_nasid, local_widget, sn_irq_info);
kfree(sn_irq_info);
}
void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
{
nasid_t nasid = sn_irq_info->irq_nasid;
int slice = sn_irq_info->irq_slice;
int cpu = nasid_slice_to_cpuid(nasid, slice);
sn_irq_info->irq_cpuid = cpu;
sn_irq_info->irq_pciioinfo = SN_PCIDEV_INFO(pci_dev);
/* link it into the sn_irq[irq] list */
sn_irq_info->irq_next = sn_irq[sn_irq_info->irq_irq];
sn_irq[sn_irq_info->irq_irq] = sn_irq_info;
(void)register_intr_pda(sn_irq_info);
}
static void force_interrupt(int irq)
{
struct sn_irq_info *sn_irq_info;
if (!sn_ioif_inited)
return;
sn_irq_info = sn_irq[irq];
while (sn_irq_info) {
if (IS_PCI_BRIDGE_ASIC(sn_irq_info->irq_bridge_type) &&
(sn_irq_info->irq_bridge != NULL)) {
pcibr_force_interrupt(sn_irq_info);
}
sn_irq_info = sn_irq_info->irq_next;
}
}
/*
* Check for lost interrupts. If the PIC int_status reg. says that
* an interrupt has been sent, but not handled, and the interrupt
* is not pending in either the cpu irr regs or in the soft irr regs,
* and the interrupt is not in service, then the interrupt may have
* been lost. Force an interrupt on that pin. It is possible that
* the interrupt is in flight, so we may generate a spurious interrupt,
* but we should never miss a real lost interrupt.
*/
static void sn_check_intr(int irq, struct sn_irq_info *sn_irq_info)
{
uint64_t regval;
int irr_reg_num;
int irr_bit;
uint64_t irr_reg;
struct pcidev_info *pcidev_info;
struct pcibus_info *pcibus_info;
pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
if (!pcidev_info)
return;
pcibus_info =
(struct pcibus_info *)pcidev_info->pdi_host_pcidev_info->
pdi_pcibus_info;
regval = pcireg_intr_status_get(pcibus_info);
irr_reg_num = irq_to_vector(irq) / 64;
irr_bit = irq_to_vector(irq) % 64;
switch (irr_reg_num) {
case 0:
irr_reg = ia64_getreg(_IA64_REG_CR_IRR0);
break;
case 1:
irr_reg = ia64_getreg(_IA64_REG_CR_IRR1);
break;
case 2:
irr_reg = ia64_getreg(_IA64_REG_CR_IRR2);
break;
case 3:
irr_reg = ia64_getreg(_IA64_REG_CR_IRR3);
break;
}
if (!test_bit(irr_bit, &irr_reg)) {
if (!test_bit(irq, pda->sn_soft_irr)) {
if (!test_bit(irq, pda->sn_in_service_ivecs)) {
regval &= 0xff;
if (sn_irq_info->irq_int_bit & regval &
sn_irq_info->irq_last_intr) {
regval &=
~(sn_irq_info->
irq_int_bit & regval);
pcibr_force_interrupt(sn_irq_info);
}
}
}
}
sn_irq_info->irq_last_intr = regval;
}
void sn_lb_int_war_check(void)
{
int i;
if (!sn_ioif_inited || pda->sn_first_irq == 0)
return;
for (i = pda->sn_first_irq; i <= pda->sn_last_irq; i++) {
struct sn_irq_info *sn_irq_info = sn_irq[i];
while (sn_irq_info) {
/* Only call for PCI bridges that are fully initialized. */
if (IS_PCI_BRIDGE_ASIC(sn_irq_info->irq_bridge_type) &&
(sn_irq_info->irq_bridge != NULL)) {
sn_check_intr(i, sn_irq_info);
}
sn_irq_info = sn_irq_info->irq_next;
}
}
}
