139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2000, 2001 Broadcom Corporation
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*/
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#include <linux/clockchips.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/percpu.h>
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#include <linux/smp.h>
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#include <asm/addrspace.h>
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#include <asm/io.h>
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#include <asm/time.h>
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#include <asm/sibyte/sb1250.h>
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#include <asm/sibyte/sb1250_regs.h>
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#include <asm/sibyte/sb1250_int.h>
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#include <asm/sibyte/sb1250_scd.h>
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#define IMR_IP2_VAL K_INT_MAP_I0
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#define IMR_IP3_VAL K_INT_MAP_I1
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#define IMR_IP4_VAL K_INT_MAP_I2
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/*
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* The general purpose timer ticks at 1MHz independent if
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* the rest of the system
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*/
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static int sibyte_shutdown(struct clock_event_device *evt)
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{
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void __iomem *cfg;
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cfg = IOADDR(A_SCD_TIMER_REGISTER(smp_processor_id(), R_SCD_TIMER_CFG));
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/* Stop the timer until we actually program a shot */
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__raw_writeq(0, cfg);
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return 0;
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}
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static int sibyte_set_periodic(struct clock_event_device *evt)
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{
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unsigned int cpu = smp_processor_id();
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void __iomem *cfg, *init;
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cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
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init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
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__raw_writeq(0, cfg);
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__raw_writeq((V_SCD_TIMER_FREQ / HZ) - 1, init);
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__raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS, cfg);
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return 0;
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}
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static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
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{
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unsigned int cpu = smp_processor_id();
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void __iomem *cfg, *init;
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cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
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init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
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__raw_writeq(0, cfg);
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__raw_writeq(delta - 1, init);
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__raw_writeq(M_SCD_TIMER_ENABLE, cfg);
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return 0;
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}
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static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
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{
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unsigned int cpu = smp_processor_id();
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struct clock_event_device *cd = dev_id;
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void __iomem *cfg;
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unsigned long tmode;
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if (clockevent_state_periodic(cd))
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tmode = M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS;
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else
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tmode = 0;
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/* ACK interrupt */
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cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
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____raw_writeq(tmode, cfg);
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cd->event_handler(cd);
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return IRQ_HANDLED;
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}
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static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
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static DEFINE_PER_CPU(char [18], sibyte_hpt_name);
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void sb1250_clockevent_init(void)
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{
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unsigned int cpu = smp_processor_id();
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unsigned int irq = K_INT_TIMER_0 + cpu;
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struct clock_event_device *cd = &per_cpu(sibyte_hpt_clockevent, cpu);
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unsigned char *name = per_cpu(sibyte_hpt_name, cpu);
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unsigned long flags = IRQF_PERCPU | IRQF_TIMER;
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/* Only have 4 general purpose timers, and we use last one as hpt */
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BUG_ON(cpu > 2);
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sprintf(name, "sb1250-counter-%d", cpu);
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cd->name = name;
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cd->features = CLOCK_EVT_FEAT_PERIODIC |
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CLOCK_EVT_FEAT_ONESHOT;
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clockevent_set_clock(cd, V_SCD_TIMER_FREQ);
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cd->max_delta_ns = clockevent_delta2ns(0x7fffff, cd);
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cd->max_delta_ticks = 0x7fffff;
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cd->min_delta_ns = clockevent_delta2ns(2, cd);
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cd->min_delta_ticks = 2;
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cd->rating = 200;
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cd->irq = irq;
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cd->cpumask = cpumask_of(cpu);
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cd->set_next_event = sibyte_next_event;
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cd->set_state_shutdown = sibyte_shutdown;
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cd->set_state_periodic = sibyte_set_periodic;
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cd->set_state_oneshot = sibyte_shutdown;
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clockevents_register_device(cd);
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sb1250_mask_irq(cpu, irq);
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/*
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* Map the timer interrupt to IP[4] of this cpu
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*/
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__raw_writeq(IMR_IP4_VAL,
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IOADDR(A_IMR_REGISTER(cpu, R_IMR_INTERRUPT_MAP_BASE) +
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(irq << 3)));
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sb1250_unmask_irq(cpu, irq);
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irq_set_affinity(irq, cpumask_of(cpu));
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if (request_irq(irq, sibyte_counter_handler, flags, name, cd))
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pr_err("Failed to request irq %d (%s)\n", irq, name);
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}
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