/* * Celleb/Beat Interrupt controller * * (C) Copyright 2006-2007 TOSHIBA CORPORATION * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/percpu.h> #include <linux/types.h> #include <asm/machdep.h> #include "beat_interrupt.h" #include "beat_wrapper.h" #define MAX_IRQS NR_IRQS static DEFINE_SPINLOCK(beatic_irq_mask_lock); static uint64_t beatic_irq_mask_enable[(MAX_IRQS+255)/64]; static uint64_t beatic_irq_mask_ack[(MAX_IRQS+255)/64]; static struct irq_host *beatic_host; /* * In this implementation, "virq" == "IRQ plug number", * "(irq_hw_number_t)hwirq" == "IRQ outlet number". */ /* assumption: locked */ static inline void beatic_update_irq_mask(unsigned int irq_plug) { int off; unsigned long masks[4]; off = (irq_plug / 256) * 4; masks[0] = beatic_irq_mask_enable[off + 0] & beatic_irq_mask_ack[off + 0]; masks[1] = beatic_irq_mask_enable[off + 1] & beatic_irq_mask_ack[off + 1]; masks[2] = beatic_irq_mask_enable[off + 2] & beatic_irq_mask_ack[off + 2]; masks[3] = beatic_irq_mask_enable[off + 3] & beatic_irq_mask_ack[off + 3]; if (beat_set_interrupt_mask(irq_plug&~255UL, masks[0], masks[1], masks[2], masks[3]) != 0) panic("Failed to set mask IRQ!"); } static void beatic_mask_irq(unsigned int irq_plug) { unsigned long flags; spin_lock_irqsave(&beatic_irq_mask_lock, flags); beatic_irq_mask_enable[irq_plug/64] &= ~(1UL << (63 - (irq_plug%64))); beatic_update_irq_mask(irq_plug); spin_unlock_irqrestore(&beatic_irq_mask_lock, flags); } static void beatic_unmask_irq(unsigned int irq_plug) { unsigned long flags; spin_lock_irqsave(&beatic_irq_mask_lock, flags); beatic_irq_mask_enable[irq_plug/64] |= 1UL << (63 - (irq_plug%64)); beatic_update_irq_mask(irq_plug); spin_unlock_irqrestore(&beatic_irq_mask_lock, flags); } static void beatic_ack_irq(unsigned int irq_plug) { unsigned long flags; spin_lock_irqsave(&beatic_irq_mask_lock, flags); beatic_irq_mask_ack[irq_plug/64] &= ~(1UL << (63 - (irq_plug%64))); beatic_update_irq_mask(irq_plug); spin_unlock_irqrestore(&beatic_irq_mask_lock, flags); } static void beatic_end_irq(unsigned int irq_plug) { s64 err; unsigned long flags; err = beat_downcount_of_interrupt(irq_plug); if (err != 0) { if ((err & 0xFFFFFFFF) != 0xFFFFFFF5) /* -11: wrong state */ panic("Failed to downcount IRQ! Error = %16lx", err); printk(KERN_ERR "IRQ over-downcounted, plug %d\n", irq_plug); } spin_lock_irqsave(&beatic_irq_mask_lock, flags); beatic_irq_mask_ack[irq_plug/64] |= 1UL << (63 - (irq_plug%64)); beatic_update_irq_mask(irq_plug); spin_unlock_irqrestore(&beatic_irq_mask_lock, flags); } static struct irq_chip beatic_pic = { .typename = " CELL-BEAT ", .unmask = beatic_unmask_irq, .mask = beatic_mask_irq, .eoi = beatic_end_irq, }; /* * Dispose binding hardware IRQ number (hw) and Virtuql IRQ number (virq), * update flags. * * Note that the number (virq) is already assigned at upper layer. */ static void beatic_pic_host_unmap(struct irq_host *h, unsigned int virq) { beat_destruct_irq_plug(virq); } /* * Create or update binding hardware IRQ number (hw) and Virtuql * IRQ number (virq). This is called only once for a given mapping. * * Note that the number (virq) is already assigned at upper layer. */ static int beatic_pic_host_map(struct irq_host *h, unsigned int virq, irq_hw_number_t hw) { struct irq_desc *desc = get_irq_desc(virq); int64_t err; err = beat_construct_and_connect_irq_plug(virq, hw); if (err < 0) return -EIO; desc->status |= IRQ_LEVEL; set_irq_chip_and_handler(virq, &beatic_pic, handle_fasteoi_irq); return 0; } /* * Update binding hardware IRQ number (hw) and Virtuql * IRQ number (virq). This is called only once for a given mapping. */ static void beatic_pic_host_remap(struct irq_host *h, unsigned int virq, irq_hw_number_t hw) { beat_construct_and_connect_irq_plug(virq, hw); } /* * Translate device-tree interrupt spec to irq_hw_number_t style (ulong), * to pass away to irq_create_mapping(). * * Called from irq_create_of_mapping() only. * Note: We have only 1 entry to translate. */ static int beatic_pic_host_xlate(struct irq_host *h, struct device_node *ct, u32 *intspec, unsigned int intsize, irq_hw_number_t *out_hwirq, unsigned int *out_flags) { u64 *intspec2 = (u64 *)intspec; *out_hwirq = *intspec2; *out_flags |= IRQ_TYPE_LEVEL_LOW; return 0; } static int beatic_pic_host_match(struct irq_host *h, struct device_node *np) { /* Match all */ return 1; } static struct irq_host_ops beatic_pic_host_ops = { .map = beatic_pic_host_map, .remap = beatic_pic_host_remap, .unmap = beatic_pic_host_unmap, .xlate = beatic_pic_host_xlate, .match = beatic_pic_host_match, }; /* * Get an IRQ number * Note: returns VIRQ */ static inline unsigned int beatic_get_irq_plug(void) { int i; uint64_t pending[4], ub; for (i = 0; i < MAX_IRQS; i += 256) { beat_detect_pending_interrupts(i, pending); __asm__ ("cntlzd %0,%1":"=r"(ub): "r"(pending[0] & beatic_irq_mask_enable[i/64+0] & beatic_irq_mask_ack[i/64+0])); if (ub != 64) return i + ub + 0; __asm__ ("cntlzd %0,%1":"=r"(ub): "r"(pending[1] & beatic_irq_mask_enable[i/64+1] & beatic_irq_mask_ack[i/64+1])); if (ub != 64) return i + ub + 64; __asm__ ("cntlzd %0,%1":"=r"(ub): "r"(pending[2] & beatic_irq_mask_enable[i/64+2] & beatic_irq_mask_ack[i/64+2])); if (ub != 64) return i + ub + 128; __asm__ ("cntlzd %0,%1":"=r"(ub): "r"(pending[3] & beatic_irq_mask_enable[i/64+3] & beatic_irq_mask_ack[i/64+3])); if (ub != 64) return i + ub + 192; } return NO_IRQ; } unsigned int beatic_get_irq(void) { unsigned int ret; ret = beatic_get_irq_plug(); if (ret != NO_IRQ) beatic_ack_irq(ret); return ret; } /* */ void __init beatic_init_IRQ(void) { int i; memset(beatic_irq_mask_enable, 0, sizeof(beatic_irq_mask_enable)); memset(beatic_irq_mask_ack, 255, sizeof(beatic_irq_mask_ack)); for (i = 0; i < MAX_IRQS; i += 256) beat_set_interrupt_mask(i, 0L, 0L, 0L, 0L); /* Set out get_irq function */ ppc_md.get_irq = beatic_get_irq; /* Allocate an irq host */ beatic_host = irq_alloc_host(NULL, IRQ_HOST_MAP_NOMAP, 0, &beatic_pic_host_ops, 0); BUG_ON(beatic_host == NULL); irq_set_default_host(beatic_host); } #ifdef CONFIG_SMP /* Nullified to compile with SMP mode */ void beatic_setup_cpu(int cpu) { } void beatic_cause_IPI(int cpu, int mesg) { } void beatic_request_IPIs(void) { } #endif /* CONFIG_SMP */ void beatic_deinit_IRQ(void) { int i; for (i = 1; i < NR_IRQS; i++) beat_destruct_irq_plug(i); }