/*
* arch/powerpc/kernel/mpic.c
*
* Driver for interrupt controllers following the OpenPIC standard, the
* common implementation beeing IBM's MPIC. This driver also can deal
* with various broken implementations of this HW.
*
* Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
*
* 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.
*/
#undef DEBUG
#undef DEBUG_IPI
#undef DEBUG_IRQ
#undef DEBUG_LOW
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/bootmem.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#include <asm/ptrace.h>
#include <asm/signal.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/machdep.h>
#include <asm/mpic.h>
#include <asm/smp.h>
#ifdef DEBUG
#define DBG(fmt...) printk(fmt)
#else
#define DBG(fmt...)
#endif
static struct mpic *mpics;
static struct mpic *mpic_primary;
static DEFINE_SPINLOCK(mpic_lock);
#ifdef CONFIG_PPC32 /* XXX for now */
#ifdef CONFIG_IRQ_ALL_CPUS
#define distribute_irqs (1)
#else
#define distribute_irqs (0)
#endif
#endif
/*
* Register accessor functions
*/
static inline u32 _mpic_read(unsigned int be, volatile u32 __iomem *base,
unsigned int reg)
{
if (be)
return in_be32(base + (reg >> 2));
else
return in_le32(base + (reg >> 2));
}
static inline void _mpic_write(unsigned int be, volatile u32 __iomem *base,
unsigned int reg, u32 value)
{
if (be)
out_be32(base + (reg >> 2), value);
else
out_le32(base + (reg >> 2), value);
}
static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
{
unsigned int be = (mpic->flags & MPIC_BIG_ENDIAN) != 0;
unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10);
if (mpic->flags & MPIC_BROKEN_IPI)
be = !be;
return _mpic_read(be, mpic->gregs, offset);
}
static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
{
unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10);
_mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->gregs, offset, value);
}
static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
{
unsigned int cpu = 0;
if (mpic->flags & MPIC_PRIMARY)
cpu = hard_smp_processor_id();
return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg);
}
static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
{
unsigned int cpu = 0;
if (mpic->flags & MPIC_PRIMARY)
cpu = hard_smp_processor_id();
_mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg, value);
}
static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
{
unsigned int isu = src_no >> mpic->isu_shift;
unsigned int idx = src_no & mpic->isu_mask;
return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
reg + (idx * MPIC_IRQ_STRIDE));
}
static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
unsigned int reg, u32 value)
{
unsigned int isu = src_no >> mpic->isu_shift;
unsigned int idx = src_no & mpic->isu_mask;
_mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
reg + (idx * MPIC_IRQ_STRIDE), value);
}
#define mpic_read(b,r) _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,(b),(r))
#define mpic_write(b,r,v) _mpic_write(mpic->flags & MPIC_BIG_ENDIAN,(b),(r),(v))
#define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i))
#define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v))
#define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i))
#define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v))
#define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r))
#define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v))
/*
* Low level utility functions
*/
/* Check if we have one of those nice broken MPICs with a flipped endian on
* reads from IPI registers
*/
static void __init mpic_test_broken_ipi(struct mpic *mpic)
{
u32 r;
mpic_write(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0, MPIC_VECPRI_MASK);
r = mpic_read(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0);
if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
mpic->flags |= MPIC_BROKEN_IPI;
}
}
#ifdef CONFIG_MPIC_BROKEN_U3
/* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
* to force the edge setting on the MPIC and do the ack workaround.
*/
static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
{
if (source >= 128 || !mpic->fixups)
return 0;
return mpic->fixups[source].base != NULL;
}
static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
{
struct mpic_irq_fixup *fixup = &mpic->fixups[source];
if (fixup->applebase) {
unsigned int soff = (fixup->index >> 3) & ~3;
unsigned int mask = 1U << (fixup->index & 0x1f);
writel(mask, fixup->applebase + soff);
} else {
spin_lock(&mpic->fixup_lock);
writeb(0x11 + 2 * fixup->index, fixup->base + 2);
writel(fixup->data, fixup->base + 4);
spin_unlock(&mpic->fixup_lock);
}
}
static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
unsigned int irqflags)
{
struct mpic_irq_fixup *fixup = &mpic->fixups[source];
unsigned long flags;
u32 tmp;
if (fixup->base == NULL)
return;
DBG("startup_ht_interrupt(%u, %u) index: %d\n",
source, irqflags, fixup->index);
spin_lock_irqsave(&mpic->fixup_lock, flags);
/* Enable and configure */
writeb(0x10 + 2 * fixup->index, fixup->base + 2);
tmp = readl(fixup->base + 4);
tmp &= ~(0x23U);
if (irqflags & IRQ_LEVEL)
tmp |= 0x22;
writel(tmp, fixup->base + 4);
spin_unlock_irqrestore(&mpic->fixup_lock, flags);
}
static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
unsigned int irqflags)
{
struct mpic_irq_fixup *fixup = &mpic->fixups[source];
unsigned long flags;
u32 tmp;
if (fixup->base == NULL)
return;
DBG("shutdown_ht_interrupt(%u, %u)\n", source, irqflags);
/* Disable */
spin_lock_irqsave(&mpic->fixup_lock, flags);
writeb(0x10 + 2 * fixup->index, fixup->base + 2);
tmp = readl(fixup->base + 4);
tmp &= ~1U;
writel(tmp, fixup->base + 4);
spin_unlock_irqrestore(&mpic->fixup_lock, flags);
}
static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
unsigned int devfn, u32 vdid)
{
int i, irq, n;
u8 __iomem *base;
u32 tmp;
u8 pos;
for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
if (id == PCI_CAP_ID_HT_IRQCONF) {
id = readb(devbase + pos + 3);
if (id == 0x80)
break;
}
}
if (pos == 0)
return;
base = devbase + pos;
writeb(0x01, base + 2);
n = (readl(base + 4) >> 16) & 0xff;
printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x"
" has %d irqs\n",
devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
for (i = 0; i <= n; i++) {
writeb(0x10 + 2 * i, base + 2);
tmp = readl(base + 4);
irq = (tmp >> 16) & 0xff;
DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
/* mask it , will be unmasked later */
tmp |= 0x1;
writel(tmp, base + 4);
mpic->fixups[irq].index = i;
mpic->fixups[irq].base = base;
/* Apple HT PIC has a non-standard way of doing EOIs */
if ((vdid & 0xffff) == 0x106b)
mpic->fixups[irq].applebase = devbase + 0x60;
else
mpic->fixups[irq].applebase = NULL;
writeb(0x11 + 2 * i, base + 2);
mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
}
}
static void __init mpic_scan_ht_pics(struct mpic *mpic)
{
unsigned int devfn;
u8 __iomem *cfgspace;
printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
/* Allocate fixups array */
mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
BUG_ON(mpic->fixups == NULL);
memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup));
/* Init spinlock */
spin_lock_init(&mpic->fixup_lock);
/* Map U3 config space. We assume all IO-APICs are on the primary bus
* so we only need to map 64kB.
*/
cfgspace = ioremap(0xf2000000, 0x10000);
BUG_ON(cfgspace == NULL);
/* Now we scan all slots. We do a very quick scan, we read the header
* type, vendor ID and device ID only, that's plenty enough
*/
for (devfn = 0; devfn < 0x100; devfn++) {
u8 __iomem *devbase = cfgspace + (devfn << 8);
u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
u32 l = readl(devbase + PCI_VENDOR_ID);
u16 s;
DBG("devfn %x, l: %x\n", devfn, l);
/* If no device, skip */
if (l == 0xffffffff || l == 0x00000000 ||
l == 0x0000ffff || l == 0xffff0000)
goto next;
/* Check if is supports capability lists */
s = readw(devbase + PCI_STATUS);
if (!(s & PCI_STATUS_CAP_LIST))
goto next;
mpic_scan_ht_pic(mpic, devbase, devfn, l);
next:
/* next device, if function 0 */
if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
devfn += 7;
}
}
#endif /* CONFIG_MPIC_BROKEN_U3 */
/* Find an mpic associated with a given linux interrupt */
static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
{
struct mpic *mpic = mpics;
while(mpic) {
/* search IPIs first since they may override the main interrupts */
if (irq >= mpic->ipi_offset && irq < (mpic->ipi_offset + 4)) {
if (is_ipi)
*is_ipi = 1;
return mpic;
}
if (irq >= mpic->irq_offset &&
irq < (mpic->irq_offset + mpic->irq_count)) {
if (is_ipi)
*is_ipi = 0;
return mpic;
}
mpic = mpic -> next;
}
return NULL;
}
/* Convert a cpu mask from logical to physical cpu numbers. */
static inline u32 mpic_physmask(u32 cpumask)
{
int i;
u32 mask = 0;
for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
return mask;
}
#ifdef CONFIG_SMP
/* Get the mpic structure from the IPI number */
static inline struct mpic * mpic_from_ipi(unsigned int ipi)
{
return container_of(irq_desc[ipi].handler, struct mpic, hc_ipi);
}
#endif
/* Get the mpic structure from the irq number */
static inline struct mpic * mpic_from_irq(unsigned int irq)
{
return container_of(irq_desc[irq].handler, struct mpic, hc_irq);
}
/* Send an EOI */
static inline void mpic_eoi(struct mpic *mpic)
{
mpic_cpu_write(MPIC_CPU_EOI, 0);
(void)mpic_cpu_read(MPIC_CPU_WHOAMI);
}
#ifdef CONFIG_SMP
static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
{
struct mpic *mpic = dev_id;
smp_message_recv(irq - mpic->ipi_offset, regs);
return IRQ_HANDLED;
}
#endif /* CONFIG_SMP */
/*
* Linux descriptor level callbacks
*/
static void mpic_enable_irq(unsigned int irq)
{
unsigned int loops = 100000;
struct mpic *mpic = mpic_from_irq(irq);
unsigned int src = irq - mpic->irq_offset;
DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) &
~MPIC_VECPRI_MASK);
/* make sure mask gets to controller before we return to user */
do {
if (!loops--) {
printk(KERN_ERR "mpic_enable_irq timeout\n");
break;
}
} while(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK);
#ifdef CONFIG_MPIC_BROKEN_U3
if (mpic->flags & MPIC_BROKEN_U3) {
unsigned int src = irq - mpic->irq_offset;
if (mpic_is_ht_interrupt(mpic, src) &&
(irq_desc[irq].status & IRQ_LEVEL))
mpic_ht_end_irq(mpic, src);
}
#endif /* CONFIG_MPIC_BROKEN_U3 */
}
static unsigned int mpic_startup_irq(unsigned int irq)
{
#ifdef CONFIG_MPIC_BROKEN_U3
struct mpic *mpic = mpic_from_irq(irq);
unsigned int src = irq - mpic->irq_offset;
if (mpic_is_ht_interrupt(mpic, src))
mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
#endif /* CONFIG_MPIC_BROKEN_U3 */
mpic_enable_irq(irq);
return 0;
}
static void mpic_disable_irq(unsigned int irq)
{
unsigned int loops = 100000;
struct mpic *mpic = mpic_from_irq(irq);
unsigned int src = irq - mpic->irq_offset;
DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) |
MPIC_VECPRI_MASK);
/* make sure mask gets to controller before we return to user */
do {
if (!loops--) {
printk(KERN_ERR "mpic_enable_irq timeout\n");
break;
}
} while(!(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK));
}
static void mpic_shutdown_irq(unsigned int irq)
{
#ifdef CONFIG_MPIC_BROKEN_U3
struct mpic *mpic = mpic_from_irq(irq);
unsigned int src = irq - mpic->irq_offset;
if (mpic_is_ht_interrupt(mpic, src))
mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
#endif /* CONFIG_MPIC_BROKEN_U3 */
mpic_disable_irq(irq);
}
static void mpic_end_irq(unsigned int irq)
{
struct mpic *mpic = mpic_from_irq(irq);
#ifdef DEBUG_IRQ
DBG("%s: end_irq: %d\n", mpic->name, irq);
#endif
/* We always EOI on end_irq() even for edge interrupts since that
* should only lower the priority, the MPIC should have properly
* latched another edge interrupt coming in anyway
*/
#ifdef CONFIG_MPIC_BROKEN_U3
if (mpic->flags & MPIC_BROKEN_U3) {
unsigned int src = irq - mpic->irq_offset;
if (mpic_is_ht_interrupt(mpic, src) &&
(irq_desc[irq].status & IRQ_LEVEL))
mpic_ht_end_irq(mpic, src);
}
#endif /* CONFIG_MPIC_BROKEN_U3 */
mpic_eoi(mpic);
}
#ifdef CONFIG_SMP
static void mpic_enable_ipi(unsigned int irq)
{
struct mpic *mpic = mpic_from_ipi(irq);
unsigned int src = irq - mpic->ipi_offset;
DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
}
static void mpic_disable_ipi(unsigned int irq)
{
/* NEVER disable an IPI... that's just plain wrong! */
}
static void mpic_end_ipi(unsigned int irq)
{
struct mpic *mpic = mpic_from_ipi(irq);
/*
* IPIs are marked IRQ_PER_CPU. This has the side effect of
* preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
* applying to them. We EOI them late to avoid re-entering.
* We mark IPI's with SA_INTERRUPT as they must run with
* irqs disabled.
*/
mpic_eoi(mpic);
}
#endif /* CONFIG_SMP */
static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
{
struct mpic *mpic = mpic_from_irq(irq);
cpumask_t tmp;
cpus_and(tmp, cpumask, cpu_online_map);
mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_DESTINATION,
mpic_physmask(cpus_addr(tmp)[0]));
}
/*
* Exported functions
*/
struct mpic * __init mpic_alloc(unsigned long phys_addr,
unsigned int flags,
unsigned int isu_size,
unsigned int irq_offset,
unsigned int irq_count,
unsigned int ipi_offset,
unsigned char *senses,
unsigned int senses_count,
const char *name)
{
struct mpic *mpic;
u32 reg;
const char *vers;
int i;
mpic = alloc_bootmem(sizeof(struct mpic));
if (mpic == NULL)
return NULL;
memset(mpic, 0, sizeof(struct mpic));
mpic->name = name;
mpic->hc_irq.typename = name;
mpic->hc_irq.startup = mpic_startup_irq;
mpic->hc_irq.shutdown = mpic_shutdown_irq;
mpic->hc_irq.enable = mpic_enable_irq;
mpic->hc_irq.disable = mpic_disable_irq;
mpic->hc_irq.end = mpic_end_irq;
if (flags & MPIC_PRIMARY)
mpic->hc_irq.set_affinity = mpic_set_affinity;
#ifdef CONFIG_SMP
mpic->hc_ipi.typename = name;
mpic->hc_ipi.enable = mpic_enable_ipi;
mpic->hc_ipi.disable = mpic_disable_ipi;
mpic->hc_ipi.end = mpic_end_ipi;
#endif /* CONFIG_SMP */
mpic->flags = flags;
mpic->isu_size = isu_size;
mpic->irq_offset = irq_offset;
mpic->irq_count = irq_count;
mpic->ipi_offset = ipi_offset;
mpic->num_sources = 0; /* so far */
mpic->senses = senses;
mpic->senses_count = senses_count;
/* Map the global registers */
mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000);
mpic->tmregs = mpic->gregs + ((MPIC_TIMER_BASE - MPIC_GREG_BASE) >> 2);
BUG_ON(mpic->gregs == NULL);
/* Reset */
if (flags & MPIC_WANTS_RESET) {
mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0,
mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
| MPIC_GREG_GCONF_RESET);
while( mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
& MPIC_GREG_GCONF_RESET)
mb();
}
/* Read feature register, calculate num CPUs and, for non-ISU
* MPICs, num sources as well. On ISU MPICs, sources are counted
* as ISUs are added
*/
reg = mpic_read(mpic->gregs, MPIC_GREG_FEATURE_0);
mpic->num_cpus = ((reg & MPIC_GREG_FEATURE_LAST_CPU_MASK)
>> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
if (isu_size == 0)
mpic->num_sources = ((reg & MPIC_GREG_FEATURE_LAST_SRC_MASK)
>> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
/* Map the per-CPU registers */
for (i = 0; i < mpic->num_cpus; i++) {
mpic->cpuregs[i] = ioremap(phys_addr + MPIC_CPU_BASE +
i * MPIC_CPU_STRIDE, 0x1000);
BUG_ON(mpic->cpuregs[i] == NULL);
}
/* Initialize main ISU if none provided */
if (mpic->isu_size == 0) {
mpic->isu_size = mpic->num_sources;
mpic->isus[0] = ioremap(phys_addr + MPIC_IRQ_BASE,
MPIC_IRQ_STRIDE * mpic->isu_size);
BUG_ON(mpic->isus[0] == NULL);
}
mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
mpic->isu_mask = (1 << mpic->isu_shift) - 1;
/* Display version */
switch (reg & MPIC_GREG_FEATURE_VERSION_MASK) {
case 1:
vers = "1.0";
break;
case 2:
vers = "1.2";
break;
case 3:
vers = "1.3";
break;
default:
vers = "<unknown>";
break;
}
printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n",
name, vers, phys_addr, mpic->num_cpus);
printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size,
mpic->isu_shift, mpic->isu_mask);
mpic->next = mpics;
mpics = mpic;
if (flags & MPIC_PRIMARY)
mpic_primary = mpic;
return mpic;
}
void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
unsigned long phys_addr)
{
unsigned int isu_first = isu_num * mpic->isu_size;
BUG_ON(isu_num >= MPIC_MAX_ISU);
mpic->isus[isu_num] = ioremap(phys_addr, MPIC_IRQ_STRIDE * mpic->isu_size);
if ((isu_first + mpic->isu_size) > mpic->num_sources)
mpic->num_sources = isu_first + mpic->isu_size;
}
void __init mpic_setup_cascade(unsigned int irq, mpic_cascade_t handler,
void *data)
{
struct mpic *mpic = mpic_find(irq, NULL);
unsigned long flags;
/* Synchronization here is a bit dodgy, so don't try to replace cascade
* interrupts on the fly too often ... but normally it's set up at boot.
*/
spin_lock_irqsave(&mpic_lock, flags);
if (mpic->cascade)
mpic_disable_irq(mpic->cascade_vec + mpic->irq_offset);
mpic->cascade = NULL;
wmb();
mpic->cascade_vec = irq - mpic->irq_offset;
mpic->cascade_data = data;
wmb();
mpic->cascade = handler;
mpic_enable_irq(irq);
spin_unlock_irqrestore(&mpic_lock, flags);
}
void __init mpic_init(struct mpic *mpic)
{
int i;
BUG_ON(mpic->num_sources == 0);
printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
/* Set current processor priority to max */
mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);
/* Initialize timers: just disable them all */
for (i = 0; i < 4; i++) {
mpic_write(mpic->tmregs,
i * MPIC_TIMER_STRIDE + MPIC_TIMER_DESTINATION, 0);
mpic_write(mpic->tmregs,
i * MPIC_TIMER_STRIDE + MPIC_TIMER_VECTOR_PRI,
MPIC_VECPRI_MASK |
(MPIC_VEC_TIMER_0 + i));
}
/* Initialize IPIs to our reserved vectors and mark them disabled for now */
mpic_test_broken_ipi(mpic);
for (i = 0; i < 4; i++) {
mpic_ipi_write(i,
MPIC_VECPRI_MASK |
(10 << MPIC_VECPRI_PRIORITY_SHIFT) |
(MPIC_VEC_IPI_0 + i));
#ifdef CONFIG_SMP
if (!(mpic->flags & MPIC_PRIMARY))
continue;
irq_desc[mpic->ipi_offset+i].status |= IRQ_PER_CPU;
irq_desc[mpic->ipi_offset+i].handler = &mpic->hc_ipi;
#endif /* CONFIG_SMP */
}
/* Initialize interrupt sources */
if (mpic->irq_count == 0)
mpic->irq_count = mpic->num_sources;
#ifdef CONFIG_MPIC_BROKEN_U3
/* Do the HT PIC fixups on U3 broken mpic */
DBG("MPIC flags: %x\n", mpic->flags);
if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY))
mpic_scan_ht_pics(mpic);
#endif /* CONFIG_MPIC_BROKEN_U3 */
for (i = 0; i < mpic->num_sources; i++) {
/* start with vector = source number, and masked */
u32 vecpri = MPIC_VECPRI_MASK | i | (8 << MPIC_VECPRI_PRIORITY_SHIFT);
int level = 0;
/* if it's an IPI, we skip it */
if ((mpic->irq_offset + i) >= (mpic->ipi_offset + i) &&
(mpic->irq_offset + i) < (mpic->ipi_offset + i + 4))
continue;
/* do senses munging */
if (mpic->senses && i < mpic->senses_count) {
if (mpic->senses[i] & IRQ_SENSE_LEVEL)
vecpri |= MPIC_VECPRI_SENSE_LEVEL;
if (mpic->senses[i] & IRQ_POLARITY_POSITIVE)
vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
} else
vecpri |= MPIC_VECPRI_SENSE_LEVEL;
/* remember if it was a level interrupts */
level = (vecpri & MPIC_VECPRI_SENSE_LEVEL);
/* deal with broken U3 */
if (mpic->flags & MPIC_BROKEN_U3) {
#ifdef CONFIG_MPIC_BROKEN_U3
if (mpic_is_ht_interrupt(mpic, i)) {
vecpri &= ~(MPIC_VECPRI_SENSE_MASK |
MPIC_VECPRI_POLARITY_MASK);
vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
}
#else
printk(KERN_ERR "mpic: BROKEN_U3 set, but CONFIG doesn't match\n");
#endif
}
DBG("setup source %d, vecpri: %08x, level: %d\n", i, vecpri,
(level != 0));
/* init hw */
mpic_irq_write(i, MPIC_IRQ_VECTOR_PRI, vecpri);
mpic_irq_write(i, MPIC_IRQ_DESTINATION,
1 << hard_smp_processor_id());
/* init linux descriptors */
if (i < mpic->irq_count) {
irq_desc[mpic->irq_offset+i].status = level ? IRQ_LEVEL : 0;
irq_desc[mpic->irq_offset+i].handler = &mpic->hc_irq;
}
}
/* Init spurrious vector */
mpic_write(mpic->gregs, MPIC_GREG_SPURIOUS, MPIC_VEC_SPURRIOUS);
/* Disable 8259 passthrough */
mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0,
mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
| MPIC_GREG_GCONF_8259_PTHROU_DIS);
/* Set current processor priority to 0 */
mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);
}
void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
{
int is_ipi;
struct mpic *mpic = mpic_find(irq, &is_ipi);
unsigned long flags;
u32 reg;
spin_lock_irqsave(&mpic_lock, flags);
if (is_ipi) {
reg = mpic_ipi_read(irq - mpic->ipi_offset) &
~MPIC_VECPRI_PRIORITY_MASK;
mpic_ipi_write(irq - mpic->ipi_offset,
reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
} else {
reg = mpic_irq_read(irq - mpic->irq_offset,MPIC_IRQ_VECTOR_PRI)
& ~MPIC_VECPRI_PRIORITY_MASK;
mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI,
reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
}
spin_unlock_irqrestore(&mpic_lock, flags);
}
unsigned int mpic_irq_get_priority(unsigned int irq)
{
int is_ipi;
struct mpic *mpic = mpic_find(irq, &is_ipi);
unsigned long flags;
u32 reg;
spin_lock_irqsave(&mpic_lock, flags);
if (is_ipi)
reg = mpic_ipi_read(irq - mpic->ipi_offset);
else
reg = mpic_irq_read(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI);
spin_unlock_irqrestore(&mpic_lock, flags);
return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT;
}
void mpic_setup_this_cpu(void)
{
#ifdef CONFIG_SMP
struct mpic *mpic = mpic_primary;
unsigned long flags;
u32 msk = 1 << hard_smp_processor_id();
unsigned int i;
BUG_ON(mpic == NULL);
DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
spin_lock_irqsave(&mpic_lock, flags);
/* let the mpic know we want intrs. default affinity is 0xffffffff
* until changed via /proc. That's how it's done on x86. If we want
* it differently, then we should make sure we also change the default
* values of irq_affinity in irq.c.
*/
if (distribute_irqs) {
for (i = 0; i < mpic->num_sources ; i++)
mpic_irq_write(i, MPIC_IRQ_DESTINATION,
mpic_irq_read(i, MPIC_IRQ_DESTINATION) | msk);
}
/* Set current processor priority to 0 */
mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);
spin_unlock_irqrestore(&mpic_lock, flags);
#endif /* CONFIG_SMP */
}
int mpic_cpu_get_priority(void)
{
struct mpic *mpic = mpic_primary;
return mpic_cpu_read(MPIC_CPU_CURRENT_TASK_PRI);
}
void mpic_cpu_set_priority(int prio)
{
struct mpic *mpic = mpic_primary;
prio &= MPIC_CPU_TASKPRI_MASK;
mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, prio);
}
/*
* XXX: someone who knows mpic should check this.
* do we need to eoi the ipi including for kexec cpu here (see xics comments)?
* or can we reset the mpic in the new kernel?
*/
void mpic_teardown_this_cpu(int secondary)
{
struct mpic *mpic = mpic_primary;
unsigned long flags;
u32 msk = 1 << hard_smp_processor_id();
unsigned int i;
BUG_ON(mpic == NULL);
DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
spin_lock_irqsave(&mpic_lock, flags);
/* let the mpic know we don't want intrs. */
for (i = 0; i < mpic->num_sources ; i++)
mpic_irq_write(i, MPIC_IRQ_DESTINATION,
mpic_irq_read(i, MPIC_IRQ_DESTINATION) & ~msk);
/* Set current processor priority to max */
mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);
spin_unlock_irqrestore(&mpic_lock, flags);
}
void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
{
struct mpic *mpic = mpic_primary;
BUG_ON(mpic == NULL);
#ifdef DEBUG_IPI
DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
#endif
mpic_cpu_write(MPIC_CPU_IPI_DISPATCH_0 + ipi_no * 0x10,
mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
}
int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs)
{
u32 irq;
irq = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK;
#ifdef DEBUG_LOW
DBG("%s: get_one_irq(): %d\n", mpic->name, irq);
#endif
if (mpic->cascade && irq == mpic->cascade_vec) {
#ifdef DEBUG_LOW
DBG("%s: cascading ...\n", mpic->name);
#endif
irq = mpic->cascade(regs, mpic->cascade_data);
mpic_eoi(mpic);
return irq;
}
if (unlikely(irq == MPIC_VEC_SPURRIOUS))
return -1;
if (irq < MPIC_VEC_IPI_0) {
#ifdef DEBUG_IRQ
DBG("%s: irq %d\n", mpic->name, irq + mpic->irq_offset);
#endif
return irq + mpic->irq_offset;
}
#ifdef DEBUG_IPI
DBG("%s: ipi %d !\n", mpic->name, irq - MPIC_VEC_IPI_0);
#endif
return irq - MPIC_VEC_IPI_0 + mpic->ipi_offset;
}
int mpic_get_irq(struct pt_regs *regs)
{
struct mpic *mpic = mpic_primary;
BUG_ON(mpic == NULL);
return mpic_get_one_irq(mpic, regs);
}
#ifdef CONFIG_SMP
void mpic_request_ipis(void)
{
struct mpic *mpic = mpic_primary;
BUG_ON(mpic == NULL);
printk("requesting IPIs ... \n");
/* IPIs are marked SA_INTERRUPT as they must run with irqs disabled */
request_irq(mpic->ipi_offset+0, mpic_ipi_action, SA_INTERRUPT,
"IPI0 (call function)", mpic);
request_irq(mpic->ipi_offset+1, mpic_ipi_action, SA_INTERRUPT,
"IPI1 (reschedule)", mpic);
request_irq(mpic->ipi_offset+2, mpic_ipi_action, SA_INTERRUPT,
"IPI2 (unused)", mpic);
request_irq(mpic->ipi_offset+3, mpic_ipi_action, SA_INTERRUPT,
"IPI3 (debugger break)", mpic);
printk("IPIs requested... \n");
}
void smp_mpic_message_pass(int target, int msg)
{
/* make sure we're sending something that translates to an IPI */
if ((unsigned int)msg > 3) {
printk("SMP %d: smp_message_pass: unknown msg %d\n",
smp_processor_id(), msg);
return;
}
switch (target) {
case MSG_ALL:
mpic_send_ipi(msg, 0xffffffff);
break;
case MSG_ALL_BUT_SELF:
mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
break;
default:
mpic_send_ipi(msg, 1 << target);
break;
}
}
#endif /* CONFIG_SMP */
