321 lines
8.5 KiB
C
321 lines
8.5 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2008 Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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*/
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#include <linux/bitmap.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/irq.h>
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#include <asm/io.h>
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#include <asm/gic.h>
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#include <asm/setup.h>
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#include <asm/traps.h>
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#include <asm/gcmpregs.h>
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#include <linux/hardirq.h>
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#include <asm-generic/bitops/find.h>
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unsigned long _gic_base;
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unsigned int gic_irq_base;
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unsigned int gic_irq_flags[GIC_NUM_INTRS];
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/* The index into this array is the vector # of the interrupt. */
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struct gic_shared_intr_map gic_shared_intr_map[GIC_NUM_INTRS];
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static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
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static struct gic_pending_regs pending_regs[NR_CPUS];
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static struct gic_intrmask_regs intrmask_regs[NR_CPUS];
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unsigned int gic_get_timer_pending(void)
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{
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unsigned int vpe_pending;
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GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), 0);
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GICREAD(GIC_REG(VPE_OTHER, GIC_VPE_PEND), vpe_pending);
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return (vpe_pending & GIC_VPE_PEND_TIMER_MSK);
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}
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void gic_bind_eic_interrupt(int irq, int set)
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{
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/* Convert irq vector # to hw int # */
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irq -= GIC_PIN_TO_VEC_OFFSET;
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/* Set irq to use shadow set */
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GICWRITE(GIC_REG_ADDR(VPE_LOCAL, GIC_VPE_EIC_SS(irq)), set);
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}
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void gic_send_ipi(unsigned int intr)
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{
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GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), 0x80000000 | intr);
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}
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static void gic_eic_irq_dispatch(void)
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{
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unsigned int cause = read_c0_cause();
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int irq;
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irq = (cause & ST0_IM) >> STATUSB_IP2;
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if (irq == 0)
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irq = -1;
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if (irq >= 0)
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do_IRQ(gic_irq_base + irq);
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else
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spurious_interrupt();
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}
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static void __init vpe_local_setup(unsigned int numvpes)
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{
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unsigned long timer_intr = GIC_INT_TMR;
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unsigned long perf_intr = GIC_INT_PERFCTR;
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unsigned int vpe_ctl;
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int i;
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if (cpu_has_veic) {
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/*
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* GIC timer interrupt -> CPU HW Int X (vector X+2) ->
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* map to pin X+2-1 (since GIC adds 1)
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*/
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timer_intr += (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
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/*
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* GIC perfcnt interrupt -> CPU HW Int X (vector X+2) ->
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* map to pin X+2-1 (since GIC adds 1)
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*/
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perf_intr += (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
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}
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/*
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* Setup the default performance counter timer interrupts
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* for all VPEs
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*/
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for (i = 0; i < numvpes; i++) {
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GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
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/* Are Interrupts locally routable? */
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GICREAD(GIC_REG(VPE_OTHER, GIC_VPE_CTL), vpe_ctl);
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if (vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK)
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GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP),
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GIC_MAP_TO_PIN_MSK | timer_intr);
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if (cpu_has_veic) {
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set_vi_handler(timer_intr + GIC_PIN_TO_VEC_OFFSET,
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gic_eic_irq_dispatch);
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gic_shared_intr_map[timer_intr + GIC_PIN_TO_VEC_OFFSET].local_intr_mask |= GIC_VPE_RMASK_TIMER_MSK;
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}
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if (vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK)
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GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP),
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GIC_MAP_TO_PIN_MSK | perf_intr);
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if (cpu_has_veic) {
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set_vi_handler(perf_intr + GIC_PIN_TO_VEC_OFFSET, gic_eic_irq_dispatch);
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gic_shared_intr_map[perf_intr + GIC_PIN_TO_VEC_OFFSET].local_intr_mask |= GIC_VPE_RMASK_PERFCNT_MSK;
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}
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}
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}
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unsigned int gic_get_int(void)
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{
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unsigned int i;
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unsigned long *pending, *intrmask, *pcpu_mask;
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unsigned long *pending_abs, *intrmask_abs;
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/* Get per-cpu bitmaps */
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pending = pending_regs[smp_processor_id()].pending;
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intrmask = intrmask_regs[smp_processor_id()].intrmask;
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pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;
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pending_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
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GIC_SH_PEND_31_0_OFS);
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intrmask_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
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GIC_SH_MASK_31_0_OFS);
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for (i = 0; i < BITS_TO_LONGS(GIC_NUM_INTRS); i++) {
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GICREAD(*pending_abs, pending[i]);
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GICREAD(*intrmask_abs, intrmask[i]);
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pending_abs++;
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intrmask_abs++;
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}
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bitmap_and(pending, pending, intrmask, GIC_NUM_INTRS);
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bitmap_and(pending, pending, pcpu_mask, GIC_NUM_INTRS);
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return find_first_bit(pending, GIC_NUM_INTRS);
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}
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static void gic_mask_irq(struct irq_data *d)
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{
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GIC_CLR_INTR_MASK(d->irq - gic_irq_base);
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}
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static void gic_unmask_irq(struct irq_data *d)
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{
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GIC_SET_INTR_MASK(d->irq - gic_irq_base);
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}
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#ifdef CONFIG_SMP
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static DEFINE_SPINLOCK(gic_lock);
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static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
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bool force)
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{
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unsigned int irq = (d->irq - gic_irq_base);
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cpumask_t tmp = CPU_MASK_NONE;
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unsigned long flags;
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int i;
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cpumask_and(&tmp, cpumask, cpu_online_mask);
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if (cpus_empty(tmp))
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return -1;
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/* Assumption : cpumask refers to a single CPU */
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spin_lock_irqsave(&gic_lock, flags);
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for (;;) {
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/* Re-route this IRQ */
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GIC_SH_MAP_TO_VPE_SMASK(irq, first_cpu(tmp));
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/* Update the pcpu_masks */
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for (i = 0; i < NR_CPUS; i++)
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clear_bit(irq, pcpu_masks[i].pcpu_mask);
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set_bit(irq, pcpu_masks[first_cpu(tmp)].pcpu_mask);
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}
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cpumask_copy(d->affinity, cpumask);
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spin_unlock_irqrestore(&gic_lock, flags);
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return IRQ_SET_MASK_OK_NOCOPY;
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}
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#endif
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static struct irq_chip gic_irq_controller = {
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.name = "MIPS GIC",
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.irq_ack = gic_irq_ack,
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.irq_mask = gic_mask_irq,
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.irq_mask_ack = gic_mask_irq,
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.irq_unmask = gic_unmask_irq,
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.irq_eoi = gic_finish_irq,
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#ifdef CONFIG_SMP
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.irq_set_affinity = gic_set_affinity,
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#endif
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};
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static void __init gic_setup_intr(unsigned int intr, unsigned int cpu,
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unsigned int pin, unsigned int polarity, unsigned int trigtype,
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unsigned int flags)
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{
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struct gic_shared_intr_map *map_ptr;
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/* Setup Intr to Pin mapping */
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if (pin & GIC_MAP_TO_NMI_MSK) {
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GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)), pin);
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/* FIXME: hack to route NMI to all cpu's */
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for (cpu = 0; cpu < NR_CPUS; cpu += 32) {
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GICWRITE(GIC_REG_ADDR(SHARED,
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GIC_SH_MAP_TO_VPE_REG_OFF(intr, cpu)),
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0xffffffff);
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}
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} else {
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GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)),
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GIC_MAP_TO_PIN_MSK | pin);
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/* Setup Intr to CPU mapping */
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GIC_SH_MAP_TO_VPE_SMASK(intr, cpu);
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if (cpu_has_veic) {
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set_vi_handler(pin + GIC_PIN_TO_VEC_OFFSET,
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gic_eic_irq_dispatch);
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map_ptr = &gic_shared_intr_map[pin + GIC_PIN_TO_VEC_OFFSET];
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if (map_ptr->num_shared_intr >= GIC_MAX_SHARED_INTR)
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BUG();
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map_ptr->intr_list[map_ptr->num_shared_intr++] = intr;
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}
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}
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/* Setup Intr Polarity */
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GIC_SET_POLARITY(intr, polarity);
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/* Setup Intr Trigger Type */
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GIC_SET_TRIGGER(intr, trigtype);
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/* Init Intr Masks */
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GIC_CLR_INTR_MASK(intr);
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/* Initialise per-cpu Interrupt software masks */
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if (flags & GIC_FLAG_IPI)
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set_bit(intr, pcpu_masks[cpu].pcpu_mask);
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if ((flags & GIC_FLAG_TRANSPARENT) && (cpu_has_veic == 0))
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GIC_SET_INTR_MASK(intr);
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if (trigtype == GIC_TRIG_EDGE)
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gic_irq_flags[intr] |= GIC_TRIG_EDGE;
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}
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static void __init gic_basic_init(int numintrs, int numvpes,
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struct gic_intr_map *intrmap, int mapsize)
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{
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unsigned int i, cpu;
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unsigned int pin_offset = 0;
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board_bind_eic_interrupt = &gic_bind_eic_interrupt;
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/* Setup defaults */
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for (i = 0; i < numintrs; i++) {
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GIC_SET_POLARITY(i, GIC_POL_POS);
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GIC_SET_TRIGGER(i, GIC_TRIG_LEVEL);
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GIC_CLR_INTR_MASK(i);
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if (i < GIC_NUM_INTRS) {
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gic_irq_flags[i] = 0;
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gic_shared_intr_map[i].num_shared_intr = 0;
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gic_shared_intr_map[i].local_intr_mask = 0;
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}
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}
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/*
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* In EIC mode, the HW_INT# is offset by (2-1). Need to subtract
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* one because the GIC will add one (since 0=no intr).
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*/
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if (cpu_has_veic)
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pin_offset = (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
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/* Setup specifics */
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for (i = 0; i < mapsize; i++) {
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cpu = intrmap[i].cpunum;
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if (cpu == GIC_UNUSED)
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continue;
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if (cpu == 0 && i != 0 && intrmap[i].flags == 0)
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continue;
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gic_setup_intr(i,
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intrmap[i].cpunum,
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intrmap[i].pin + pin_offset,
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intrmap[i].polarity,
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intrmap[i].trigtype,
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intrmap[i].flags);
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}
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vpe_local_setup(numvpes);
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}
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void __init gic_init(unsigned long gic_base_addr,
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unsigned long gic_addrspace_size,
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struct gic_intr_map *intr_map, unsigned int intr_map_size,
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unsigned int irqbase)
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{
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unsigned int gicconfig;
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int numvpes, numintrs;
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_gic_base = (unsigned long) ioremap_nocache(gic_base_addr,
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gic_addrspace_size);
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gic_irq_base = irqbase;
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GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
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numintrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
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GIC_SH_CONFIG_NUMINTRS_SHF;
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numintrs = ((numintrs + 1) * 8);
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numvpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
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GIC_SH_CONFIG_NUMVPES_SHF;
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numvpes = numvpes + 1;
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gic_basic_init(numintrs, numvpes, intr_map, intr_map_size);
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gic_platform_init(numintrs, &gic_irq_controller);
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}
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