+++ /dev/null
-/*
- * arch/ppc64/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
-
-#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>
-
-#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);
-
-
-/*
- * 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_no)
-{
- if (source_no >= 128 || !mpic->fixups)
- return 0;
- return mpic->fixups[source_no].base != NULL;
-}
-
-static inline void mpic_apic_end_irq(struct mpic *mpic, unsigned int source_no)
-{
- struct mpic_irq_fixup *fixup = &mpic->fixups[source_no];
- u32 tmp;
-
- spin_lock(&mpic->fixup_lock);
- writeb(0x11 + 2 * fixup->irq, fixup->base);
- tmp = readl(fixup->base + 2);
- writel(tmp | 0x80000000ul, fixup->base + 2);
- /* config writes shouldn't be posted but let's be safe ... */
- (void)readl(fixup->base + 2);
- spin_unlock(&mpic->fixup_lock);
-}
-
-
-static void __init mpic_amd8111_read_irq(struct mpic *mpic, u8 __iomem *devbase)
-{
- int i, irq;
- u32 tmp;
-
- printk(KERN_INFO "mpic: - Workarounds on AMD 8111 @ %p\n", devbase);
-
- for (i=0; i < 24; i++) {
- writeb(0x10 + 2*i, devbase + 0xf2);
- tmp = readl(devbase + 0xf4);
- if ((tmp & 0x1) || !(tmp & 0x20))
- continue;
- irq = (tmp >> 16) & 0xff;
- mpic->fixups[irq].irq = i;
- mpic->fixups[irq].base = devbase + 0xf2;
- }
-}
-
-static void __init mpic_amd8131_read_irq(struct mpic *mpic, u8 __iomem *devbase)
-{
- int i, irq;
- u32 tmp;
-
- printk(KERN_INFO "mpic: - Workarounds on AMD 8131 @ %p\n", devbase);
-
- for (i=0; i < 4; i++) {
- writeb(0x10 + 2*i, devbase + 0xba);
- tmp = readl(devbase + 0xbc);
- if ((tmp & 0x1) || !(tmp & 0x20))
- continue;
- irq = (tmp >> 16) & 0xff;
- mpic->fixups[irq].irq = i;
- mpic->fixups[irq].base = devbase + 0xba;
- }
-}
-
-static void __init mpic_scan_ioapics(struct mpic *mpic)
-{
- unsigned int devfn;
- u8 __iomem *cfgspace;
-
- printk(KERN_INFO "mpic: Setting up IO-APICs workarounds for U3\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
- * and slot will never be above "0xf" so we only need to map 32k
- */
- cfgspace = (unsigned char __iomem *)ioremap(0xf2000000, 0x8000);
- 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 < PCI_DEVFN(0x10,0); devfn ++) {
- u8 __iomem *devbase = cfgspace + (devfn << 8);
- u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
- u32 l = readl(devbase + PCI_VENDOR_ID);
- u16 vendor_id, device_id;
- int multifunc = 0;
-
- 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 it's a multifunction device (only really used
- * to function 0 though
- */
- multifunc = !!(hdr_type & 0x80);
- vendor_id = l & 0xffff;
- device_id = (l >> 16) & 0xffff;
-
- /* If a known device, go to fixup setup code */
- if (vendor_id == PCI_VENDOR_ID_AMD && device_id == 0x7460)
- mpic_amd8111_read_irq(mpic, devbase);
- if (vendor_id == PCI_VENDOR_ID_AMD && device_id == 0x7450)
- mpic_amd8131_read_irq(mpic, devbase);
- next:
- /* next device, if function 0 */
- if ((PCI_FUNC(devfn) == 0) && !multifunc)
- 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("%s: enable_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_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_end_irq(unsigned int irq)
-{
- struct mpic *mpic = mpic_from_irq(irq);
-
- DBG("%s: end_irq: %d\n", mpic->name, irq);
-
- /* 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))
- mpic_apic_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.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 >> 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 ioapic fixups on U3 broken mpic */
- DBG("MPIC flags: %x\n", mpic->flags);
- if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY))
- mpic_scan_ioapics(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 << get_hard_smp_processor_id(boot_cpuid));
-
- /* 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 */
-}
-
-/*
- * 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);
-
- DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
-
- 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;
- DBG("%s: get_one_irq(): %d\n", mpic->name, irq);
-
- if (mpic->cascade && irq == mpic->cascade_vec) {
- DBG("%s: cascading ...\n", mpic->name);
- 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)
- return irq + mpic->irq_offset;
- DBG("%s: ipi %d !\n", mpic->name, irq - MPIC_VEC_IPI_0);
- 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");
-}
-#endif /* CONFIG_SMP */
projects / karo-tx-linux.git / commitdiff