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-rw-r--r--arch/powerpc/sysdev/mpic.c1893
1 files changed, 1893 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
new file mode 100644
index 00000000000..4e9ccb1015d
--- /dev/null
+++ b/arch/powerpc/sysdev/mpic.c
@@ -0,0 +1,1893 @@
+/*
+ * 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 2010-2011 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 u32 _mpic_tm_read(struct mpic *mpic, unsigned int tm)
+{
+ unsigned int offset = MPIC_INFO(TIMER_VECTOR_PRI) +
+ ((tm & 3) * MPIC_INFO(TIMER_STRIDE));
+
+ if (tm >= 4)
+ offset += 0x1000 / 4;
+
+ 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_INFO(TIMER_VECTOR_PRI) +
+ ((tm & 3) * MPIC_INFO(TIMER_STRIDE));
+
+ if (tm >= 4)
+ offset += 0x1000 / 4;
+
+ _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 irq)
+{
+ unsigned int src = virq_to_hw(irq);
+
+ 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 irq)
+{
+ unsigned int src = virq_to_hw(irq);
+
+ 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 0;
+}
+
+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->irq_count)
+ return -EINVAL;
+
+ if (flow_type == IRQ_TYPE_NONE)
+ if (mpic->senses && src < mpic->senses_count)
+ flow_type = mpic->senses[src];
+ if (flow_type == IRQ_TYPE_NONE)
+ flow_type = IRQ_TYPE_LEVEL_LOW;
+
+ irqd_set_trigger_type(d, flow_type);
+
+ 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);
+
+ vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
+ 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->irq_count)
+ 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->irq_count)
+ 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_host *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_host *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))
+ return -EINVAL;
+
+#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 (hw >= mpic->irq_count)
+ 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_NONE);
+
+ /* 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_host *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:
+ case 1: /* no EISR/EIMR support for now, treat as shared IRQ */
+ 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 != NO_IRQ)
+ generic_handle_irq(virq);
+
+ chip->irq_eoi(&desc->irq_data);
+}
+
+static struct irq_host_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;
+
+ /* 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;
+ }
+ }
+
+ 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->hc_irq = mpic_irq_chip;
+ mpic->hc_irq.name = name;
+ if (!(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 (!(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->flags = flags;
+ mpic->isu_size = isu_size;
+ mpic->irq_count = irq_count;
+ mpic->num_sources = 0; /* so far */
+
+ if (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;
+
+ /* Check for "big-endian" in device-tree */
+ if (of_get_property(mpic->node, "big-endian", NULL) != NULL)
+ mpic->flags |= MPIC_BIG_ENDIAN;
+ if (of_device_is_compatible(mpic->node, "fsl,mpic"))
+ mpic->flags |= MPIC_FSL;
+
+ /* 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(flags)];
+#endif
+
+ /* default register type */
+ if (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 (flags & MPIC_USES_DCR)
+ mpic->reg_type = mpic_access_dcr;
+#else
+ BUG_ON(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);
+
+ /* Reset */
+
+ /* When using a device-node, reset requests are only honored if the MPIC
+ * is allowed to reset.
+ */
+ if (of_get_property(mpic->node, "pic-no-reset", NULL))
+ mpic->flags |= MPIC_NO_RESET;
+
+ if ((flags & MPIC_WANTS_RESET) && !(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 (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 (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);
+
+ /*
+ * 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));
+ if (isu_size == 0) {
+ if (flags & MPIC_BROKEN_FRR_NIRQS)
+ mpic->num_sources = mpic->irq_count;
+ else
+ mpic->num_sources =
+ ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
+ >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
+ }
+
+ /*
+ * 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);
+ }
+
+ /* Initialize main ISU if none provided */
+ if (mpic->isu_size == 0) {
+ mpic->isu_size = mpic->num_sources;
+ mpic_map(mpic, mpic->paddr, &mpic->isus[0],
+ MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
+ }
+ mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
+ mpic->isu_mask = (1 << mpic->isu_shift) - 1;
+
+ mpic->irqhost = irq_alloc_host(mpic->node, IRQ_HOST_MAP_LINEAR,
+ isu_size ? isu_size : mpic->num_sources,
+ &mpic_host_ops,
+ flags & MPIC_LARGE_VECTORS ? 2048 : 256);
+
+ /*
+ * 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;
+
+ mpic->irqhost->host_data = mpic;
+
+ /* 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 (!(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_set_default_senses(struct mpic *mpic, u8 *senses, int count)
+{
+ mpic->senses = senses;
+ mpic->senses_count = count;
+}
+
+void __init mpic_init(struct mpic *mpic)
+{
+ int i, cpu;
+
+ 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);
+
+ /* Initialize timers to our reserved vectors and mask them for now */
+ for (i = 0; i < 4; i++) {
+ mpic_write(mpic->tmregs,
+ i * MPIC_INFO(TIMER_STRIDE) +
+ MPIC_INFO(TIMER_DESTINATION),
+ 1 << hard_smp_processor_id());
+ mpic_write(mpic->tmregs,
+ i * MPIC_INFO(TIMER_STRIDE) +
+ 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));
+ }
+
+ /* Initialize interrupt sources */
+ if (mpic->irq_count == 0)
+ mpic->irq_count = mpic->num_sources;
+
+ /* 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, irq)) {
+ 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, irq)) {
+ 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) {
+ 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 __devinit 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