/*
* 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.
* Copyright 2010-2012 Freescale Semiconductor, Inc.
*
* 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/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 <linux/slab.h>
#include <linux/syscore_ops.h>
#include <linux/ratelimit.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>
#include "mpic.h"
#ifdef DEBUG
#define DBG(fmt...) printk(fmt)
#else
#define DBG(fmt...)
#endif
static struct mpic *mpics;
static struct mpic *mpic_primary;
static DEFINE_RAW_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
#ifdef CONFIG_MPIC_WEIRD
static u32 mpic_infos[][MPIC_IDX_END] = {
[0] = { /* Original OpenPIC compatible MPIC */
MPIC_GREG_BASE,
MPIC_GREG_FEATURE_0,
MPIC_GREG_GLOBAL_CONF_0,
MPIC_GREG_VENDOR_ID,
MPIC_GREG_IPI_VECTOR_PRI_0,
MPIC_GREG_IPI_STRIDE,
MPIC_GREG_SPURIOUS,
MPIC_GREG_TIMER_FREQ,
MPIC_TIMER_BASE,
MPIC_TIMER_STRIDE,
MPIC_TIMER_CURRENT_CNT,
MPIC_TIMER_BASE_CNT,
MPIC_TIMER_VECTOR_PRI,
MPIC_TIMER_DESTINATION,
MPIC_CPU_BASE,
MPIC_CPU_STRIDE,
MPIC_CPU_IPI_DISPATCH_0,
MPIC_CPU_IPI_DISPATCH_STRIDE,
MPIC_CPU_CURRENT_TASK_PRI,
MPIC_CPU_WHOAMI,
MPIC_CPU_INTACK,
MPIC_CPU_EOI,
MPIC_CPU_MCACK,
MPIC_IRQ_BASE,
MPIC_IRQ_STRIDE,
MPIC_IRQ_VECTOR_PRI,
MPIC_VECPRI_VECTOR_MASK,
MPIC_VECPRI_POLARITY_POSITIVE,
MPIC_VECPRI_POLARITY_NEGATIVE,
MPIC_VECPRI_SENSE_LEVEL,
MPIC_VECPRI_SENSE_EDGE,
MPIC_VECPRI_POLARITY_MASK,
MPIC_VECPRI_SENSE_MASK,
MPIC_IRQ_DESTINATION
},
[1] = { /* Tsi108/109 PIC */
TSI108_GREG_BASE,
TSI108_GREG_FEATURE_0,
TSI108_GREG_GLOBAL_CONF_0,
TSI108_GREG_VENDOR_ID,
TSI108_GREG_IPI_VECTOR_PRI_0,
TSI108_GREG_IPI_STRIDE,
TSI108_GREG_SPURIOUS,
TSI108_GREG_TIMER_FREQ,
TSI108_TIMER_BASE,
TSI108_TIMER_STRIDE,
TSI108_TIMER_CURRENT_CNT,
TSI108_TIMER_BASE_CNT,
TSI108_TIMER_VECTOR_PRI,
TSI108_TIMER_DESTINATION,
TSI108_CPU_BASE,
TSI108_CPU_STRIDE,
TSI108_CPU_IPI_DISPATCH_0,
TSI108_CPU_IPI_DISPATCH_STRIDE,
TSI108_CPU_CURRENT_TASK_PRI,
TSI108_CPU_WHOAMI,
TSI108_CPU_INTACK,
TSI108_CPU_EOI,
TSI108_CPU_MCACK,
TSI108_IRQ_BASE,
TSI108_IRQ_STRIDE,
TSI108_IRQ_VECTOR_PRI,
TSI108_VECPRI_VECTOR_MASK,
TSI108_VECPRI_POLARITY_POSITIVE,
TSI108_VECPRI_POLARITY_NEGATIVE,
TSI108_VECPRI_SENSE_LEVEL,
TSI108_VECPRI_SENSE_EDGE,
TSI108_VECPRI_POLARITY_MASK,
TSI108_VECPRI_SENSE_MASK,
TSI108_IRQ_DESTINATION
},
};
#define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
#else /* CONFIG_MPIC_WEIRD */
#define MPIC_INFO(name) MPIC_##name
#endif /* CONFIG_MPIC_WEIRD */
static inline unsigned int mpic_processor_id(struct mpic *mpic)
{
unsigned int cpu = 0;
if (!(mpic->flags & MPIC_SECONDARY))
cpu = hard_smp_processor_id();
return cpu;
}
/*
* Register accessor functions
*/
static inline u32 _mpic_read(enum mpic_reg_type type,
struct mpic_reg_bank *rb,
unsigned int reg)
{
switch(type) {
#ifdef CONFIG_PPC_DCR
case mpic_access_dcr:
return dcr_read(rb->dhost, reg);
#endif
case mpic_access_mmio_be:
return in_be32(rb->base + (reg >> 2));
case mpic_access_mmio_le:
default:
return in_le32(rb->base + (reg >> 2));
}
}
static inline void _mpic_write(enum mpic_reg_type type,
struct mpic_reg_bank *rb,
unsigned int reg, u32 value)
{
switch(type) {
#ifdef CONFIG_PPC_DCR
case mpic_access_dcr:
dcr_write(rb->dhost, reg, value);
break;
#endif
case mpic_access_mmio_be:
out_be32(rb->base + (reg >> 2), value);
break;
case mpic_access_mmio_le:
default:
out_le32(rb->base + (reg >> 2), value);
break;
}
}
static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
{
enum mpic_reg_type type = mpic->reg_type;
unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
(ipi * MPIC_INFO(GREG_IPI_STRIDE));
if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
type = mpic_access_mmio_be;
return _mpic_read(type, &mpic->gregs, offset);
}
static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
{
unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
(ipi * MPIC_INFO(GREG_IPI_STRIDE));
_mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
}
static inline unsigned int mpic_tm_offset(struct mpic *mpic, unsigned int tm)
{
return (tm >> 2) * MPIC_TIMER_GROUP_STRIDE +
(tm & 3) * MPIC_INFO(TIMER_STRIDE);
}
static inline u32 _mpic_tm_read(struct mpic *mpic, unsigned int tm)
{
unsigned int offset = mpic_tm_offset(mpic, tm) +
MPIC_INFO(TIMER_VECTOR_PRI);
return _mpic_read(mpic->reg_type, &mpic->tmregs, offset);
}
static inline void _mpic_tm_write(struct mpic *mpic, unsigned int tm, u32 value)
{
unsigned int offset = mpic_tm_offset(mpic, tm) +
MPIC_INFO(TIMER_VECTOR_PRI);
_mpic_write(mpic->reg_type, &mpic->tmregs, offset, value);
}
static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
{
unsigned int cpu = mpic_processor_id(mpic);
return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
}
static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
{
unsigned int cpu = mpic_processor_id(mpic);
_mpic_write(mpic->reg_type, &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;
unsigned int val;
val = _mpic_read(mpic->reg_type, &mpic->isus[isu],
reg + (idx * MPIC_INFO(IRQ_STRIDE)));
#ifdef CONFIG_MPIC_BROKEN_REGREAD
if (reg == 0)
val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
mpic->isu_reg0_shadow[src_no];
#endif
return val;
}
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->reg_type, &mpic->isus[isu],
reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
#ifdef CONFIG_MPIC_BROKEN_REGREAD
if (reg == 0)
mpic->isu_reg0_shadow[src_no] =
value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY);
#endif
}
#define mpic_read(b,r) _mpic_read(mpic->reg_type,&(b),(r))
#define mpic_write(b,r,v) _mpic_write(mpic->reg_type,&(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_tm_read(i) _mpic_tm_read(mpic,(i))
#define mpic_tm_write(i,v) _mpic_tm_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
*/
static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
struct mpic_reg_bank *rb, unsigned int offset,
unsigned int size)
{
rb->base = ioremap(phys_addr + offset, size);
BUG_ON(rb->base == NULL);
}
#ifdef CONFIG_PPC_DCR
static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
unsigned int offset, unsigned int size)
{
phys_addr_t phys_addr = dcr_resource_start(mpic->node, 0);
rb->dhost = dcr_map(mpic->node, phys_addr + offset, size);
BUG_ON(!DCR_MAP_OK(rb->dhost));
}
static inline void mpic_map(struct mpic *mpic,
phys_addr_t phys_addr, struct mpic_reg_bank *rb,
unsigned int offset, unsigned int size)
{
if (mpic->flags & MPIC_USES_DCR)
_mpic_map_dcr(mpic, rb, offset, size);
else
_mpic_map_mmio(mpic, phys_addr, rb, offset, size);
}
#else /* CONFIG_PPC_DCR */
#define mpic_map(m,p,b,o,s) _mpic_map_mmio(m,p,b,o,s)
#endif /* !CONFIG_PPC_DCR */
/* 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_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
r = mpic_read(mpic->gregs, MPIC_INFO(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_U3_HT_IRQS
/* 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 {
raw_spin_lock(&mpic->fixup_lock);
writeb(0x11 + 2 * fixup->index, fixup->base + 2);
writel(fixup->data, fixup->base + 4);
raw_spin_unlock(&mpic->fixup_lock);
}
}
static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
bool level)
{
struct mpic_irq_fixup *fixup = &mpic->fixups[source];
unsigned long flags;
u32 tmp;
if (fixup->base == NULL)
return;
DBG("startup_ht_interrupt(0x%x) index: %d\n",
source, fixup->index);
raw_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 (level)
tmp |= 0x22;
writel(tmp, fixup->base + 4);
raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
#ifdef CONFIG_PM
/* use the lowest bit inverted to the actual HW,
* set if this fixup was enabled, clear otherwise */
mpic->save_data[source].fixup_data = tmp | 1;
#endif
}
static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source)
{
struct mpic_irq_fixup *fixup = &mpic->fixups[source];
unsigned long flags;
u32 tmp;
if (fixup->base == NULL)
return;
DBG("shutdown_ht_interrupt(0x%x)\n", source);
/* Disable */
raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
writeb(0x10 + 2 * fixup->index, fixup->base + 2);
tmp = readl(fixup->base + 4);
tmp |= 1;
writel(tmp, fixup->base + 4);
raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
#ifdef CONFIG_PM
/* use the lowest bit inverted to the actual HW,
* set if this fixup was enabled, clear otherwise */
mpic->save_data[source].fixup_data = tmp & ~1;
#endif
}
#ifdef CONFIG_PCI_MSI
static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
unsigned int devfn)
{
u8 __iomem *base;
u8 pos, flags;
u64 addr = 0;
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) {
id = readb(devbase + pos + 3);
if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
break;
}
}
if (pos == 0)
return;
base = devbase + pos;
flags = readb(base + HT_MSI_FLAGS);
if (!(flags & HT_MSI_FLAGS_FIXED)) {
addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
}
printk(KERN_DEBUG "mpic: - HT:%02x.%x %s MSI mapping found @ 0x%llx\n",
PCI_SLOT(devfn), PCI_FUNC(devfn),
flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
if (!(flags & HT_MSI_FLAGS_ENABLE))
writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
}
#else
static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
unsigned int devfn)
{
return;
}
#endif
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) {
id = readb(devbase + pos + 3);
if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
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 = kzalloc(128 * sizeof(*mpic->fixups), GFP_KERNEL);
BUG_ON(mpic->fixups == NULL);
/* Init spinlock */
raw_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);
mpic_scan_ht_msi(mpic, devbase, devfn);
next:
/* next device, if function 0 */
if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
devfn += 7;
}
}
#else /* CONFIG_MPIC_U3_HT_IRQS */
static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
{
return 0;
}
static void __init mpic_scan_ht_pics(struct mpic *mpic)
{
}
#endif /* CONFIG_MPIC_U3_HT_IRQS */
/* Find an mpic associated with a given linux interrupt */
static struct mpic *mpic_find(unsigned int irq)
{
if (irq < NUM_ISA_INTERRUPTS)
return NULL;
return irq_get_chip_data(irq);
}
/* Determine if the linux irq is an IPI */
static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int src)
{
return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]);
}
/* Determine if the linux irq is a timer */
static unsigned int mpic_is_tm(struct mpic *mpic, unsigned int src)
{
return (src >= mpic->timer_vecs[0] && src <= mpic->timer_vecs[7]);
}
/* 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 < min(32, 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(struct irq_data *d)
{
return irq_data_get_irq_chip_data(d);
}
#endif
/* Get the mpic structure from the irq number */
static inline struct mpic * mpic_from_irq(unsigned int irq)
{
return irq_get_chip_data(irq);
}
/* Get the mpic structure from the irq data */
static inline struct mpic * mpic_from_irq_data(struct irq_data *d)
{
return irq_data_get_irq_chip_data(d);
}
/* Send an EOI */
static inline void mpic_eoi(struct mpic *mpic)
{
mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
(void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
}
/*
* Linux descriptor level callbacks
*/
void mpic_unmask_irq(struct irq_data *d)
{
unsigned int loops = 100000;
struct mpic *mpic = mpic_from_irq_data(d);
unsigned int src = irqd_to_hwirq(d);
DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, d->irq, src);
mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
~MPIC_VECPRI_MASK);
/* make sure mask gets to controller before we return to user */
do {
if (!loops--) {
printk(KERN_ERR "%s: timeout on hwirq %u\n",
__func__, src);
break;
}
} while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
}
void mpic_mask_irq(struct irq_data *d)
{
unsigned int loops = 100000;
struct mpic *mpic = mpic_from_irq_data(d);
unsigned int src = irqd_to_hwirq(d);
DBG("%s: disable_irq: %d (src %d)\n", mpic->name, d->irq, src);
mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
MPIC_VECPRI_MASK);
/* make sure mask gets to controller before we return to user */
do {
if (!loops--) {
printk(KERN_ERR "%s: timeout on hwirq %u\n",
__func__, src);
break;
}
} while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
}
void mpic_end_irq(struct irq_data *d)
{
struct mpic *mpic = mpic_from_irq_data(d);
#ifdef DEBUG_IRQ
DBG("%s: end_irq: %d\n", mpic->name, d->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
*/
mpic_eoi(mpic);
}
#ifdef CONFIG_MPIC_U3_HT_IRQS
static void mpic_unmask_ht_irq(struct irq_data *d)
{
struct mpic *mpic = mpic_from_irq_data(d);
unsigned int src = irqd_to_hwirq(d);
mpic_unmask_irq(d);
if (irqd_is_level_type(d))
mpic_ht_end_irq(mpic, src);
}
static unsigned int mpic_startup_ht_irq(struct irq_data *d)
{
struct mpic *mpic = mpic_from_irq_data(d);
unsigned int src = irqd_to_hwirq(d);
mpic_unmask_irq(d);
mpic_startup_ht_interrupt(mpic, src, irqd_is_level_type(d));
return 0;
}
static void mpic_shutdown_ht_irq(struct irq_data *d)
{
struct mpic *mpic = mpic_from_irq_data(d);
unsigned int src = irqd_to_hwirq(d);
mpic_shutdown_ht_interrupt(mpic, src);
mpic_mask_irq(d);
}
static void mpic_end_ht_irq(struct irq_data *d)
{
struct mpic *mpic = mpic_from_irq_data(d);
unsigned int src = irqd_to_hwirq(d);
#ifdef DEBUG_IRQ
DBG("%s: end_irq: %d\n", mpic->name, d->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
*/
if (irqd_is_level_type(d))
mpic_ht_end_irq(mpic, src);
mpic_eoi(mpic);
}
#endif /* !CONFIG_MPIC_U3_HT_IRQS */
#ifdef CONFIG_SMP
static void mpic_unmask_ipi(struct irq_data *d)
{
struct mpic *mpic = mpic_from_ipi(d);
unsigned int src = virq_to_hw(d->irq) - mpic->ipi_vecs[0];
DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, d->irq, src);
mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
}
static void mpic_mask_ipi(struct irq_data *d)
{
/* NEVER disable an IPI... that's just plain wrong! */
}
static void mpic_end_ipi(struct irq_data *d)
{
struct mpic *mpic = mpic_from_ipi(d);
/*
* 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.
*/
mpic_eoi(mpic);
}
#endif /* CONFIG_SMP */
static void mpic_unmask_tm(struct irq_data *d)
{
struct mpic *mpic = mpic_from_irq_data(d);
unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0];
DBG("%s: enable_tm: %d (tm %d)\n", mpic->name, d->irq, src);
mpic_tm_write(src, mpic_tm_read(src) & ~MPIC_VECPRI_MASK);
mpic_tm_read(src);
}
static void mpic_mask_tm(struct irq_data *d)
{
struct mpic *mpic = mpic_from_irq_data(d);
unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0];
mpic_tm_write(src, mpic_tm_read(src) | MPIC_VECPRI_MASK);
mpic_tm_read(src);
}
int mpic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
bool force)
{
struct mpic *mpic = mpic_from_irq_data(d);
unsigned int src = irqd_to_hwirq(d);
if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
int cpuid = irq_choose_cpu(cpumask);
mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
} else {
u32 mask = cpumask_bits(cpumask)[0];
mask &= cpumask_bits(cpu_online_mask)[0];
mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
mpic_physmask(mask));
}
return IRQ_SET_MASK_OK;
}
static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
{
/* Now convert sense value */
switch(type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_RISING:
return MPIC_INFO(VECPRI_SENSE_EDGE) |
MPIC_INFO(VECPRI_POLARITY_POSITIVE);
case IRQ_TYPE_EDGE_FALLING:
case IRQ_TYPE_EDGE_BOTH:
return MPIC_INFO(VECPRI_SENSE_EDGE) |
MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
case IRQ_TYPE_LEVEL_HIGH:
return MPIC_INFO(VECPRI_SENSE_LEVEL) |
MPIC_INFO(VECPRI_POLARITY_POSITIVE);
case IRQ_TYPE_LEVEL_LOW:
default:
return MPIC_INFO(VECPRI_SENSE_LEVEL) |
MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
}
}
int mpic_set_irq_type(struct irq_data *d, unsigned int flow_type)
{
struct mpic *mpic = mpic_from_irq_data(d);
unsigned int src = irqd_to_hwirq(d);
unsigned int vecpri, vold, vnew;
DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
mpic, d->irq, src, flow_type);
if (src >= mpic->num_sources)
return -EINVAL;
vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
/* We don't support "none" type */
if (flow_type == IRQ_TYPE_NONE)
flow_type = IRQ_TYPE_DEFAULT;
/* Default: read HW settings */
if (flow_type == IRQ_TYPE_DEFAULT) {
switch(vold & (MPIC_INFO(VECPRI_POLARITY_MASK) |
MPIC_INFO(VECPRI_SENSE_MASK))) {
case MPIC_INFO(VECPRI_SENSE_EDGE) |
MPIC_INFO(VECPRI_POLARITY_POSITIVE):
flow_type = IRQ_TYPE_EDGE_RISING;
break;
case MPIC_INFO(VECPRI_SENSE_EDGE) |
MPIC_INFO(VECPRI_POLARITY_NEGATIVE):
flow_type = IRQ_TYPE_EDGE_FALLING;
break;
case MPIC_INFO(VECPRI_SENSE_LEVEL) |
MPIC_INFO(VECPRI_POLARITY_POSITIVE):
flow_type = IRQ_TYPE_LEVEL_HIGH;
break;
case MPIC_INFO(VECPRI_SENSE_LEVEL) |
MPIC_INFO(VECPRI_POLARITY_NEGATIVE):
flow_type = IRQ_TYPE_LEVEL_LOW;
break;
}
}
/* Apply to irq desc */
irqd_set_trigger_type(d, flow_type);
/* Apply to HW */
if (mpic_is_ht_interrupt(mpic, src))
vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
MPIC_VECPRI_SENSE_EDGE;
else
vecpri = mpic_type_to_vecpri(mpic, flow_type);
vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
MPIC_INFO(VECPRI_SENSE_MASK));
vnew |= vecpri;
if (vold != vnew)
mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
return IRQ_SET_MASK_OK_NOCOPY;
}
void mpic_set_vector(unsigned int virq, unsigned int vector)
{
struct mpic *mpic = mpic_from_irq(virq);
unsigned int src = virq_to_hw(virq);
unsigned int vecpri;
DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
mpic, virq, src, vector);
if (src >= mpic->num_sources)
return;
vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
vecpri |= vector;
mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
}
void mpic_set_destination(unsigned int virq, unsigned int cpuid)
{
struct mpic *mpic = mpic_from_irq(virq);
unsigned int src = virq_to_hw(virq);
DBG("mpic: set_destination(mpic:@%p,virq:%d,src:%d,cpuid:0x%x)\n",
mpic, virq, src, cpuid);
if (src >= mpic->num_sources)
return;
mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
}
static struct irq_chip mpic_irq_chip = {
.irq_mask = mpic_mask_irq,
.irq_unmask = mpic_unmask_irq,
.irq_eoi = mpic_end_irq,
.irq_set_type = mpic_set_irq_type,
};
#ifdef CONFIG_SMP
static struct irq_chip mpic_ipi_chip = {
.irq_mask = mpic_mask_ipi,
.irq_unmask = mpic_unmask_ipi,
.irq_eoi = mpic_end_ipi,
};
#endif /* CONFIG_SMP */
static struct irq_chip mpic_tm_chip = {
.irq_mask = mpic_mask_tm,
.irq_unmask = mpic_unmask_tm,
.irq_eoi = mpic_end_irq,
};
#ifdef CONFIG_MPIC_U3_HT_IRQS
static struct irq_chip mpic_irq_ht_chip = {
.irq_startup = mpic_startup_ht_irq,
.irq_shutdown = mpic_shutdown_ht_irq,
.irq_mask = mpic_mask_irq,
.irq_unmask = mpic_unmask_ht_irq,
.irq_eoi = mpic_end_ht_irq,
.irq_set_type = mpic_set_irq_type,
};
#endif /* CONFIG_MPIC_U3_HT_IRQS */
static int mpic_host_match(struct irq_domain *h, struct device_node *node)
{
/* Exact match, unless mpic node is NULL */
return h->of_node == NULL || h->of_node == node;
}
static int mpic_host_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
struct mpic *mpic = h->host_data;
struct irq_chip *chip;
DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
if (hw == mpic->spurious_vec)
return -EINVAL;
if (mpic->protected && test_bit(hw, mpic->protected)) {
pr_warning("mpic: Mapping of source 0x%x failed, "
"source protected by firmware !\n",\
(unsigned int)hw);
return -EPERM;
}
#ifdef CONFIG_SMP
else if (hw >= mpic->ipi_vecs[0]) {
WARN_ON(mpic->flags & MPIC_SECONDARY);
DBG("mpic: mapping as IPI\n");
irq_set_chip_data(virq, mpic);
irq_set_chip_and_handler(virq, &mpic->hc_ipi,
handle_percpu_irq);
return 0;
}
#endif /* CONFIG_SMP */
if (hw >= mpic->timer_vecs[0] && hw <= mpic->timer_vecs[7]) {
WARN_ON(mpic->flags & MPIC_SECONDARY);
DBG("mpic: mapping as timer\n");
irq_set_chip_data(virq, mpic);
irq_set_chip_and_handler(virq, &mpic->hc_tm,
handle_fasteoi_irq);
return 0;
}
if (mpic_map_error_int(mpic, virq, hw))
return 0;
if (hw >= mpic->num_sources) {
pr_warning("mpic: Mapping of source 0x%x failed, "
"source out of range !\n",\
(unsigned int)hw);
return -EINVAL;
}
mpic_msi_reserve_hwirq(mpic, hw);
/* Default chip */
chip = &mpic->hc_irq;
#ifdef CONFIG_MPIC_U3_HT_IRQS
/* Check for HT interrupts, override vecpri */
if (mpic_is_ht_interrupt(mpic, hw))
chip = &mpic->hc_ht_irq;
#endif /* CONFIG_MPIC_U3_HT_IRQS */
DBG("mpic: mapping to irq chip @%p\n", chip);
irq_set_chip_data(virq, mpic);
irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq);
/* Set default irq type */
irq_set_irq_type(virq, IRQ_TYPE_DEFAULT);
/* If the MPIC was reset, then all vectors have already been
* initialized. Otherwise, a per source lazy initialization
* is done here.
*/
if (!mpic_is_ipi(mpic, hw) && (mpic->flags & MPIC_NO_RESET)) {
mpic_set_vector(virq, hw);
mpic_set_destination(virq, mpic_processor_id(mpic));
mpic_irq_set_priority(virq, 8);
}
return 0;
}
static int mpic_host_xlate(struct irq_domain *h, struct device_node *ct,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq, unsigned int *out_flags)
{
struct mpic *mpic = h->host_data;
static unsigned char map_mpic_senses[4] = {
IRQ_TYPE_EDGE_RISING,
IRQ_TYPE_LEVEL_LOW,
IRQ_TYPE_LEVEL_HIGH,
IRQ_TYPE_EDGE_FALLING,
};
*out_hwirq = intspec[0];
if (intsize >= 4 && (mpic->flags & MPIC_FSL)) {
/*
* Freescale MPIC with extended intspec:
* First two cells are as usual. Third specifies
* an "interrupt type". Fourth is type-specific data.
*
* See Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
*/
switch (intspec[2]) {
case 0:
break;
case 1:
if (!(mpic->flags & MPIC_FSL_HAS_EIMR))
break;
if (intspec[3] >= ARRAY_SIZE(mpic->err_int_vecs))
return -EINVAL;
*out_hwirq = mpic->err_int_vecs[intspec[3]];
break;
case 2:
if (intspec[0] >= ARRAY_SIZE(mpic->ipi_vecs))
return -EINVAL;
*out_hwirq = mpic->ipi_vecs[intspec[0]];
break;
case 3:
if (intspec[0] >= ARRAY_SIZE(mpic->timer_vecs))
return -EINVAL;
*out_hwirq = mpic->timer_vecs[intspec[0]];
break;
default:
pr_debug("%s: unknown irq type %u\n",
__func__, intspec[2]);
return -EINVAL;
}
*out_flags = map_mpic_senses[intspec[1] & 3];
} else if (intsize > 1) {
u32 mask = 0x3;
/* Apple invented a new race of encoding on machines with
* an HT APIC. They encode, among others, the index within
* the HT APIC. We don't care about it here since thankfully,
* it appears that they have the APIC already properly
* configured, and thus our current fixup code that reads the
* APIC config works fine. However, we still need to mask out
* bits in the specifier to make sure we only get bit 0 which
* is the level/edge bit (the only sense bit exposed by Apple),
* as their bit 1 means something else.
*/
if (machine_is(powermac))
mask = 0x1;
*out_flags = map_mpic_senses[intspec[1] & mask];
} else
*out_flags = IRQ_TYPE_NONE;
DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
return 0;
}
/* IRQ handler for a secondary MPIC cascaded from another IRQ controller */
static void mpic_cascade(unsigned int irq, struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct mpic *mpic = irq_desc_get_handler_data(desc);
unsigned int virq;
BUG_ON(!(mpic->flags & MPIC_SECONDARY));
virq = mpic_get_one_irq(mpic);
if (virq)
generic_handle_irq(virq);
chip->irq_eoi(&desc->irq_data);
}
static struct irq_domain_ops mpic_host_ops = {
.match = mpic_host_match,
.map = mpic_host_map,
.xlate = mpic_host_xlate,
};
/*
* Exported functions
*/
struct mpic * __init mpic_alloc(struct device_node *node,
phys_addr_t phys_addr,
unsigned int flags,
unsigned int isu_size,
unsigned int irq_count,
const char *name)
{
int i, psize, intvec_top;
struct mpic *mpic;
u32 greg_feature;
const char *vers;
const u32 *psrc;
u32 last_irq;
u32 fsl_version = 0;
/* Default MPIC search parameters */
static const struct of_device_id __initconst mpic_device_id[] = {
{ .type = "open-pic", },
{ .compatible = "open-pic", },
{},
};
/*
* If we were not passed a device-tree node, then perform the default
* search for standardized a standardized OpenPIC.
*/
if (node) {
node = of_node_get(node);
} else {
node = of_find_matching_node(NULL, mpic_device_id);
if (!node)
return NULL;
}
/* Pick the physical address from the device tree if unspecified */
if (!phys_addr) {
/* Check if it is DCR-based */
if (of_get_property(node, "dcr-reg", NULL)) {
flags |= MPIC_USES_DCR;
} else {
struct resource r;
if (of_address_to_resource(node, 0, &r))
goto err_of_node_put;
phys_addr = r.start;
}
}
/* Read extra device-tree properties into the flags variable */
if (of_get_property(node, "big-endian", NULL))
flags |= MPIC_BIG_ENDIAN;
if (of_get_property(node, "pic-no-reset", NULL))
flags |= MPIC_NO_RESET;
if (of_get_property(node, "single-cpu-affinity", NULL))
flags |= MPIC_SINGLE_DEST_CPU;
if (of_device_is_compatible(node, "fsl,mpic"))
flags |= MPIC_FSL | MPIC_LARGE_VECTORS;
mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
if (mpic == NULL)
goto err_of_node_put;
mpic->name = name;
mpic->node = node;
mpic->paddr = phys_addr;
mpic->flags = flags;
mpic->hc_irq = mpic_irq_chip;
mpic->hc_irq.name = name;
if (!(mpic->flags & MPIC_SECONDARY))
mpic->hc_irq.irq_set_affinity = mpic_set_affinity;
#ifdef CONFIG_MPIC_U3_HT_IRQS
mpic->hc_ht_irq = mpic_irq_ht_chip;
mpic->hc_ht_irq.name = name;
if (!(mpic->flags & MPIC_SECONDARY))
mpic->hc_ht_irq.irq_set_affinity = mpic_set_affinity;
#endif /* CONFIG_MPIC_U3_HT_IRQS */
#ifdef CONFIG_SMP
mpic->hc_ipi = mpic_ipi_chip;
mpic->hc_ipi.name = name;
#endif /* CONFIG_SMP */
mpic->hc_tm = mpic_tm_chip;
mpic->hc_tm.name = name;
mpic->num_sources = 0; /* so far */
if (mpic->flags & MPIC_LARGE_VECTORS)
intvec_top = 2047;
else
intvec_top = 255;
mpic->timer_vecs[0] = intvec_top - 12;
mpic->timer_vecs[1] = intvec_top - 11;
mpic->timer_vecs[2] = intvec_top - 10;
mpic->timer_vecs[3] = intvec_top - 9;
mpic->timer_vecs[4] = intvec_top - 8;
mpic->timer_vecs[5] = intvec_top - 7;
mpic->timer_vecs[6] = intvec_top - 6;
mpic->timer_vecs[7] = intvec_top - 5;
mpic->ipi_vecs[0] = intvec_top - 4;
mpic->ipi_vecs[1] = intvec_top - 3;
mpic->ipi_vecs[2] = intvec_top - 2;
mpic->ipi_vecs[3] = intvec_top - 1;
mpic->spurious_vec = intvec_top;
/* Look for protected sources */
psrc = of_get_property(mpic->node, "protected-sources", &psize);
if (psrc) {
/* Allocate a bitmap with one bit per interrupt */
unsigned int mapsize = BITS_TO_LONGS(intvec_top + 1);
mpic->protected = kzalloc(mapsize*sizeof(long), GFP_KERNEL);
BUG_ON(mpic->protected == NULL);
for (i = 0; i < psize/sizeof(u32); i++) {
if (psrc[i] > intvec_top)
continue;
__set_bit(psrc[i], mpic->protected);
}
}
#ifdef CONFIG_MPIC_WEIRD
mpic->hw_set = mpic_infos[MPIC_GET_REGSET(mpic->flags)];
#endif
/* default register type */
if (mpic->flags & MPIC_BIG_ENDIAN)
mpic->reg_type = mpic_access_mmio_be;
else
mpic->reg_type = mpic_access_mmio_le;
/*
* An MPIC with a "dcr-reg" property must be accessed that way, but
* only if the kernel includes DCR support.
*/
#ifdef CONFIG_PPC_DCR
if (mpic->flags & MPIC_USES_DCR)
mpic->reg_type = mpic_access_dcr;
#else
BUG_ON(mpic->flags & MPIC_USES_DCR);
#endif
/* Map the global registers */
mpic_map(mpic, mpic->paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
if (mpic->flags & MPIC_FSL) {
u32 brr1;
int ret;
/*
* Yes, Freescale really did put global registers in the
* magic per-cpu area -- and they don't even show up in the
* non-magic per-cpu copies that this driver normally uses.
*/
mpic_map(mpic, mpic->paddr, &mpic->thiscpuregs,
MPIC_CPU_THISBASE, 0x1000);
brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
MPIC_FSL_BRR1);
fsl_version = brr1 & MPIC_FSL_BRR1_VER;
/* Error interrupt mask register (EIMR) is required for
* handling individual device error interrupts. EIMR
* was added in MPIC version 4.1.
*
* Over here we reserve vector number space for error
* interrupt vectors. This space is stolen from the
* global vector number space, as in case of ipis
* and timer interrupts.
*
* Available vector space = intvec_top - 12, where 12
* is the number of vectors which have been consumed by
* ipis and timer interrupts.
*/
if (fsl_version >= 0x401) {
ret = mpic_setup_error_int(mpic, intvec_top - 12);
if (ret)
return NULL;
}
}
/*
* EPR is only available starting with v4.0. To support
* platforms that don't know the MPIC version at compile-time,
* such as qemu-e500, turn off coreint if this MPIC doesn't
* support it. Note that we never enable it if it wasn't
* requested in the first place.
*
* This is done outside the MPIC_FSL check, so that we
* also disable coreint if the MPIC node doesn't have
* an "fsl,mpic" compatible at all. This will be the case
* with device trees generated by older versions of QEMU.
* fsl_version will be zero if MPIC_FSL is not set.
*/
if (fsl_version < 0x400 && (flags & MPIC_ENABLE_COREINT)) {
WARN_ON(ppc_md.get_irq != mpic_get_coreint_irq);
ppc_md.get_irq = mpic_get_irq;
}
/* Reset */
/* When using a device-node, reset requests are only honored if the MPIC
* is allowed to reset.
*/
if (!(mpic->flags & MPIC_NO_RESET)) {
printk(KERN_DEBUG "mpic: Resetting\n");
mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
| MPIC_GREG_GCONF_RESET);
while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
& MPIC_GREG_GCONF_RESET)
mb();
}
/* CoreInt */
if (mpic->flags & MPIC_ENABLE_COREINT)
mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
| MPIC_GREG_GCONF_COREINT);
if (mpic->flags & MPIC_ENABLE_MCK)
mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
| MPIC_GREG_GCONF_MCK);
/*
* The MPIC driver will crash if there are more cores than we
* can initialize, so we may as well catch that problem here.
*/
BUG_ON(num_possible_cpus() > MPIC_MAX_CPUS);
/* Map the per-CPU registers */
for_each_possible_cpu(i) {
unsigned int cpu = get_hard_smp_processor_id(i);
mpic_map(mpic, mpic->paddr, &mpic->cpuregs[cpu],
MPIC_INFO(CPU_BASE) + cpu * MPIC_INFO(CPU_STRIDE),
0x1000);
}
/*
* Read feature register. For non-ISU MPICs, num sources as well. On
* ISU MPICs, sources are counted as ISUs are added
*/
greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
/*
* By default, the last source number comes from the MPIC, but the
* device-tree and board support code can override it on buggy hw.
* If we get passed an isu_size (multi-isu MPIC) then we use that
* as a default instead of the value read from the HW.
*/
last_irq = (greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
>> MPIC_GREG_FEATURE_LAST_SRC_SHIFT;
if (isu_size)
last_irq = isu_size * MPIC_MAX_ISU - 1;
of_property_read_u32(mpic->node, "last-interrupt-source", &last_irq);
if (irq_count)
last_irq = irq_count - 1;
/* Initialize main ISU if none provided */
if (!isu_size) {
isu_size = last_irq + 1;
mpic->num_sources = isu_size;
mpic_map(mpic, mpic->paddr, &mpic->isus[0],
MPIC_INFO(IRQ_BASE),
MPIC_INFO(IRQ_STRIDE) * isu_size);
}
mpic->isu_size = isu_size;
mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
mpic->isu_mask = (1 << mpic->isu_shift) - 1;
mpic->irqhost = irq_domain_add_linear(mpic->node,
intvec_top,
&mpic_host_ops, mpic);
/*
* FIXME: The code leaks the MPIC object and mappings here; this
* is very unlikely to fail but it ought to be fixed anyways.
*/
if (mpic->irqhost == NULL)
return NULL;
/* Display version */
switch (greg_feature & 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 %llx,"
" max %d CPUs\n",
name, vers, (unsigned long long)mpic->paddr, num_possible_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 (!(mpic->flags & MPIC_SECONDARY)) {
mpic_primary = mpic;
irq_set_default_host(mpic->irqhost);
}
return mpic;
err_of_node_put:
of_node_put(node);
return NULL;
}
void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
phys_addr_t paddr)
{
unsigned int isu_first = isu_num * mpic->isu_size;
BUG_ON(isu_num >= MPIC_MAX_ISU);
mpic_map(mpic,
paddr, &mpic->isus[isu_num], 0,
MPIC_INFO(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_init(struct mpic *mpic)
{
int i, cpu;
int num_timers = 4;
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_INFO(CPU_CURRENT_TASK_PRI), 0xf);
if (mpic->flags & MPIC_FSL) {
u32 brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
MPIC_FSL_BRR1);
u32 version = brr1 & MPIC_FSL_BRR1_VER;
/*
* Timer group B is present at the latest in MPIC 3.1 (e.g.
* mpc8536). It is not present in MPIC 2.0 (e.g. mpc8544).
* I don't know about the status of intermediate versions (or
* whether they even exist).
*/
if (version >= 0x0301)
num_timers = 8;
}
/* FSL mpic error interrupt intialization */
if (mpic->flags & MPIC_FSL_HAS_EIMR)
mpic_err_int_init(mpic, MPIC_FSL_ERR_INT);
/* Initialize timers to our reserved vectors and mask them for now */
for (i = 0; i < num_timers; i++) {
unsigned int offset = mpic_tm_offset(mpic, i);
mpic_write(mpic->tmregs,
offset + MPIC_INFO(TIMER_DESTINATION),
1 << hard_smp_processor_id());
mpic_write(mpic->tmregs,
offset + MPIC_INFO(TIMER_VECTOR_PRI),
MPIC_VECPRI_MASK |
(9 << MPIC_VECPRI_PRIORITY_SHIFT) |
(mpic->timer_vecs[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->ipi_vecs[0] + i));
}
/* Do the HT PIC fixups on U3 broken mpic */
DBG("MPIC flags: %x\n", mpic->flags);
if ((mpic->flags & MPIC_U3_HT_IRQS) && !(mpic->flags & MPIC_SECONDARY)) {
mpic_scan_ht_pics(mpic);
mpic_u3msi_init(mpic);
}
mpic_pasemi_msi_init(mpic);
cpu = mpic_processor_id(mpic);
if (!(mpic->flags & MPIC_NO_RESET)) {
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);
/* check if protected */
if (mpic->protected && test_bit(i, mpic->protected))
continue;
/* init hw */
mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
}
}
/* Init spurious vector */
mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
/* Disable 8259 passthrough, if supported */
if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
| MPIC_GREG_GCONF_8259_PTHROU_DIS);
if (mpic->flags & MPIC_NO_BIAS)
mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
| MPIC_GREG_GCONF_NO_BIAS);
/* Set current processor priority to 0 */
mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
#ifdef CONFIG_PM
/* allocate memory to save mpic state */
mpic->save_data = kmalloc(mpic->num_sources * sizeof(*mpic->save_data),
GFP_KERNEL);
BUG_ON(mpic->save_data == NULL);
#endif
/* Check if this MPIC is chained from a parent interrupt controller */
if (mpic->flags & MPIC_SECONDARY) {
int virq = irq_of_parse_and_map(mpic->node, 0);
if (virq != NO_IRQ) {
printk(KERN_INFO "%s: hooking up to IRQ %d\n",
mpic->node->full_name, virq);
irq_set_handler_data(virq, mpic);
irq_set_chained_handler(virq, &mpic_cascade);
}
}
}
void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
{
u32 v;
v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
}
void __init mpic_set_serial_int(struct mpic *mpic, int enable)
{
unsigned long flags;
u32 v;
raw_spin_lock_irqsave(&mpic_lock, flags);
v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
if (enable)
v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
else
v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
raw_spin_unlock_irqrestore(&mpic_lock, flags);
}
void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
{
struct mpic *mpic = mpic_find(irq);
unsigned int src = virq_to_hw(irq);
unsigned long flags;
u32 reg;
if (!mpic)
return;
raw_spin_lock_irqsave(&mpic_lock, flags);
if (mpic_is_ipi(mpic, src)) {
reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
~MPIC_VECPRI_PRIORITY_MASK;
mpic_ipi_write(src - mpic->ipi_vecs[0],
reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
} else if (mpic_is_tm(mpic, src)) {
reg = mpic_tm_read(src - mpic->timer_vecs[0]) &
~MPIC_VECPRI_PRIORITY_MASK;
mpic_tm_write(src - mpic->timer_vecs[0],
reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
} else {
reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
& ~MPIC_VECPRI_PRIORITY_MASK;
mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
}
raw_spin_unlock_irqrestore(&mpic_lock, flags);
}
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());
raw_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_desc[].affinity in irq.c.
*/
if (distribute_irqs && !(mpic->flags & MPIC_SINGLE_DEST_CPU)) {
for (i = 0; i < mpic->num_sources ; i++)
mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
}
/* Set current processor priority to 0 */
mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
raw_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_INFO(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_INFO(CPU_CURRENT_TASK_PRI), prio);
}
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());
raw_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_INFO(IRQ_DESTINATION),
mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
/* Set current processor priority to max */
mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
/* We need to EOI the IPI since not all platforms reset the MPIC
* on boot and new interrupts wouldn't get delivered otherwise.
*/
mpic_eoi(mpic);
raw_spin_unlock_irqrestore(&mpic_lock, flags);
}
static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
{
u32 src;
src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
#ifdef DEBUG_LOW
DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
#endif
if (unlikely(src == mpic->spurious_vec)) {
if (mpic->flags & MPIC_SPV_EOI)
mpic_eoi(mpic);
return NO_IRQ;
}
if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
mpic->name, (int)src);
mpic_eoi(mpic);
return NO_IRQ;
}
return irq_linear_revmap(mpic->irqhost, src);
}
unsigned int mpic_get_one_irq(struct mpic *mpic)
{
return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
}
unsigned int mpic_get_irq(void)
{
struct mpic *mpic = mpic_primary;
BUG_ON(mpic == NULL);
return mpic_get_one_irq(mpic);
}
unsigned int mpic_get_coreint_irq(void)
{
#ifdef CONFIG_BOOKE
struct mpic *mpic = mpic_primary;
u32 src;
BUG_ON(mpic == NULL);
src = mfspr(SPRN_EPR);
if (unlikely(src == mpic->spurious_vec)) {
if (mpic->flags & MPIC_SPV_EOI)
mpic_eoi(mpic);
return NO_IRQ;
}
if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
mpic->name, (int)src);
return NO_IRQ;
}
return irq_linear_revmap(mpic->irqhost, src);
#else
return NO_IRQ;
#endif
}
unsigned int mpic_get_mcirq(void)
{
struct mpic *mpic = mpic_primary;
BUG_ON(mpic == NULL);
return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
}
#ifdef CONFIG_SMP
void mpic_request_ipis(void)
{
struct mpic *mpic = mpic_primary;
int i;
BUG_ON(mpic == NULL);
printk(KERN_INFO "mpic: requesting IPIs...\n");
for (i = 0; i < 4; i++) {
unsigned int vipi = irq_create_mapping(mpic->irqhost,
mpic->ipi_vecs[0] + i);
if (vipi == NO_IRQ) {
printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
continue;
}
smp_request_message_ipi(vipi, i);
}
}
void smp_mpic_message_pass(int cpu, int msg)
{
struct mpic *mpic = mpic_primary;
u32 physmask;
BUG_ON(mpic == NULL);
/* 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;
}
#ifdef DEBUG_IPI
DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, msg);
#endif
physmask = 1 << get_hard_smp_processor_id(cpu);
mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
msg * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE), physmask);
}
int __init smp_mpic_probe(void)
{
int nr_cpus;
DBG("smp_mpic_probe()...\n");
nr_cpus = cpumask_weight(cpu_possible_mask);
DBG("nr_cpus: %d\n", nr_cpus);
if (nr_cpus > 1)
mpic_request_ipis();
return nr_cpus;
}
void smp_mpic_setup_cpu(int cpu)
{
mpic_setup_this_cpu();
}
void mpic_reset_core(int cpu)
{
struct mpic *mpic = mpic_primary;
u32 pir;
int cpuid = get_hard_smp_processor_id(cpu);
int i;
/* Set target bit for core reset */
pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
pir |= (1 << cpuid);
mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
/* Restore target bit after reset complete */
pir &= ~(1 << cpuid);
mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
/* Perform 15 EOI on each reset core to clear pending interrupts.
* This is required for FSL CoreNet based devices */
if (mpic->flags & MPIC_FSL) {
for (i = 0; i < 15; i++) {
_mpic_write(mpic->reg_type, &mpic->cpuregs[cpuid],
MPIC_CPU_EOI, 0);
}
}
}
#endif /* CONFIG_SMP */
#ifdef CONFIG_PM
static void mpic_suspend_one(struct mpic *mpic)
{
int i;
for (i = 0; i < mpic->num_sources; i++) {
mpic->save_data[i].vecprio =
mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
mpic->save_data[i].dest =
mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
}
}
static int mpic_suspend(void)
{
struct mpic *mpic = mpics;
while (mpic) {
mpic_suspend_one(mpic);
mpic = mpic->next;
}
return 0;
}
static void mpic_resume_one(struct mpic *mpic)
{
int i;
for (i = 0; i < mpic->num_sources; i++) {
mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
mpic->save_data[i].vecprio);
mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
mpic->save_data[i].dest);
#ifdef CONFIG_MPIC_U3_HT_IRQS
if (mpic->fixups) {
struct mpic_irq_fixup *fixup = &mpic->fixups[i];
if (fixup->base) {
/* we use the lowest bit in an inverted meaning */
if ((mpic->save_data[i].fixup_data & 1) == 0)
continue;
/* Enable and configure */
writeb(0x10 + 2 * fixup->index, fixup->base + 2);
writel(mpic->save_data[i].fixup_data & ~1,
fixup->base + 4);
}
}
#endif
} /* end for loop */
}
static void mpic_resume(void)
{
struct mpic *mpic = mpics;
while (mpic) {
mpic_resume_one(mpic);
mpic = mpic->next;
}
}
static struct syscore_ops mpic_syscore_ops = {
.resume = mpic_resume,
.suspend = mpic_suspend,
};
static int mpic_init_sys(void)
{
register_syscore_ops(&mpic_syscore_ops);
return 0;
}
device_initcall(mpic_init_sys);
#endif