diff options
Diffstat (limited to 'arch/powerpc/sysdev/mpic.c')
| -rw-r--r-- | arch/powerpc/sysdev/mpic.c | 2019 |
1 files changed, 2019 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c new file mode 100644 index 000000000..9a9381f10 --- /dev/null +++ b/arch/powerpc/sysdev/mpic.c @@ -0,0 +1,2019 @@ +/* + * arch/powerpc/kernel/mpic.c + * + * Driver for interrupt controllers following the OpenPIC standard, the + * common implementation being 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/spinlock.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/syscore_ops.h> +#include <linux/ratelimit.h> +#include <linux/pgtable.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> + +#include <asm/ptrace.h> +#include <asm/signal.h> +#include <asm/io.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 + +struct bus_type mpic_subsys = { + .name = "mpic", + .dev_name = "mpic", +}; +EXPORT_SYMBOL_GPL(mpic_subsys); + +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 = kcalloc(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 < NR_IRQS_LEGACY) + 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) && cpu_possible(i); ++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); +} + +/* + * 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) { + int vold_ps; + + vold_ps = vold & (MPIC_INFO(VECPRI_POLARITY_MASK) | + MPIC_INFO(VECPRI_SENSE_MASK)); + + if (vold_ps == (MPIC_INFO(VECPRI_SENSE_EDGE) | + MPIC_INFO(VECPRI_POLARITY_POSITIVE))) + flow_type = IRQ_TYPE_EDGE_RISING; + else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_EDGE) | + MPIC_INFO(VECPRI_POLARITY_NEGATIVE))) + flow_type = IRQ_TYPE_EDGE_FALLING; + else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_LEVEL) | + MPIC_INFO(VECPRI_POLARITY_POSITIVE))) + flow_type = IRQ_TYPE_LEVEL_HIGH; + else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_LEVEL) | + MPIC_INFO(VECPRI_POLARITY_NEGATIVE))) + flow_type = IRQ_TYPE_LEVEL_LOW; + else + WARN_ONCE(1, "mpic: unknown IRQ type %d\n", vold); + } + + /* 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); +} + +static 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 const 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 const 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, + enum irq_domain_bus_token bus_token) +{ + /* Exact match, unless mpic node is NULL */ + struct device_node *of_node = irq_domain_get_of_node(h); + return of_node == NULL || 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_warn("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_warn("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)) { + int cpu; + + preempt_disable(); + cpu = mpic_processor_id(mpic); + preempt_enable(); + + mpic_set_vector(virq, hw); + mpic_set_destination(virq, cpu); + 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(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 const struct irq_domain_ops mpic_host_ops = { + .match = mpic_host_match, + .map = mpic_host_map, + .xlate = mpic_host_xlate, +}; + +static u32 fsl_mpic_get_version(struct mpic *mpic) +{ + u32 brr1; + + if (!(mpic->flags & MPIC_FSL)) + return 0; + + brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs, + MPIC_FSL_BRR1); + + return brr1 & MPIC_FSL_BRR1_VER; +} + +/* + * Exported functions + */ + +u32 fsl_mpic_primary_get_version(void) +{ + struct mpic *mpic = mpic_primary; + + if (mpic) + return fsl_mpic_get_version(mpic); + + return 0; +} + +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_property_read_bool(node, "dcr-reg")) { + 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_irq_chip.flags |= IRQCHIP_SKIP_SET_WAKE; + mpic_tm_chip.flags |= IRQCHIP_SKIP_SET_WAKE; + } + + 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 */ + mpic->protected = bitmap_zalloc(intvec_top + 1, 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) { + 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); + + fsl_version = fsl_mpic_get_version(mpic); + + /* 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 - 13, where 13 + * is the number of vectors which have been consumed by + * ipis, timer interrupts and spurious. + */ + if (fsl_version >= 0x401) { + ret = mpic_setup_error_int(mpic, intvec_top - 13); + 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)) + 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 version = fsl_mpic_get_version(mpic); + + /* + * 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; + } + + /* 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_array(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) { + printk(KERN_INFO "%pOF: hooking up to IRQ %d\n", + mpic->node, virq); + irq_set_handler_data(virq, mpic); + irq_set_chained_handler(virq, &mpic_cascade); + } + } + + /* FSL mpic error interrupt initialization */ + if (mpic->flags & MPIC_FSL_HAS_EIMR) + mpic_err_int_init(mpic, MPIC_FSL_ERR_INT); +} + +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 0; + } + 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 0; + } + + 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 0; + } + if (unlikely(mpic->protected && test_bit(src, mpic->protected))) { + printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n", + mpic->name, (int)src); + return 0; + } + + return irq_linear_revmap(mpic->irqhost, src); +#else + return 0; +#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 __init 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) { + 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); +} + +void __init smp_mpic_probe(void) +{ + int nr_cpus; + + DBG("smp_mpic_probe()...\n"); + + nr_cpus = num_possible_cpus(); + + DBG("nr_cpus: %d\n", nr_cpus); + + if (nr_cpus > 1) + mpic_request_ipis(); +} + +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) +{ + int rc; + + register_syscore_ops(&mpic_syscore_ops); + rc = subsys_system_register(&mpic_subsys, NULL); + if (rc) { + unregister_syscore_ops(&mpic_syscore_ops); + pr_err("mpic: Failed to register subsystem!\n"); + return rc; + } + + return 0; +} + +device_initcall(mpic_init_sys); +#endif |