2 * Copyright (C) 2000,2001,2004 Broadcom Corporation
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 #include <linux/clockchips.h>
19 #include <linux/interrupt.h>
20 #include <linux/percpu.h>
21 #include <linux/smp.h>
22 #include <linux/irq.h>
24 #include <asm/addrspace.h>
28 #include <asm/sibyte/bcm1480_regs.h>
29 #include <asm/sibyte/sb1250_regs.h>
30 #include <asm/sibyte/bcm1480_int.h>
31 #include <asm/sibyte/bcm1480_scd.h>
33 #include <asm/sibyte/sb1250.h>
35 #define IMR_IP2_VAL K_BCM1480_INT_MAP_I0
36 #define IMR_IP3_VAL K_BCM1480_INT_MAP_I1
37 #define IMR_IP4_VAL K_BCM1480_INT_MAP_I2
40 * The general purpose timer ticks at 1MHz independent if
41 * the rest of the system
43 static void sibyte_set_mode(enum clock_event_mode mode,
44 struct clock_event_device *evt)
46 unsigned int cpu = smp_processor_id();
47 void __iomem *cfg, *init;
49 cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
50 init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
53 case CLOCK_EVT_MODE_PERIODIC:
55 __raw_writeq((V_SCD_TIMER_FREQ / HZ) - 1, init);
56 __raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS,
60 case CLOCK_EVT_MODE_ONESHOT:
61 /* Stop the timer until we actually program a shot */
62 case CLOCK_EVT_MODE_SHUTDOWN:
66 case CLOCK_EVT_MODE_UNUSED: /* shuddup gcc */
67 case CLOCK_EVT_MODE_RESUME:
72 static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
74 unsigned int cpu = smp_processor_id();
75 void __iomem *cfg, *init;
77 cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
78 init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
81 __raw_writeq(delta - 1, init);
82 __raw_writeq(M_SCD_TIMER_ENABLE, cfg);
87 static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
89 unsigned int cpu = smp_processor_id();
90 struct clock_event_device *cd = dev_id;
94 if (cd->mode == CLOCK_EVT_MODE_PERIODIC)
95 tmode = M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS;
100 cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
101 ____raw_writeq(tmode, cfg);
103 cd->event_handler(cd);
108 static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
109 static DEFINE_PER_CPU(struct irqaction, sibyte_hpt_irqaction);
110 static DEFINE_PER_CPU(char [18], sibyte_hpt_name);
112 void sb1480_clockevent_init(void)
114 unsigned int cpu = smp_processor_id();
115 unsigned int irq = K_BCM1480_INT_TIMER_0 + cpu;
116 struct irqaction *action = &per_cpu(sibyte_hpt_irqaction, cpu);
117 struct clock_event_device *cd = &per_cpu(sibyte_hpt_clockevent, cpu);
118 unsigned char *name = per_cpu(sibyte_hpt_name, cpu);
120 BUG_ON(cpu > 3); /* Only have 4 general purpose timers */
122 sprintf(name, "bcm1480-counter-%d", cpu);
124 cd->features = CLOCK_EVT_FEAT_PERIODIC |
125 CLOCK_EVT_FEAT_ONESHOT;
126 clockevent_set_clock(cd, V_SCD_TIMER_FREQ);
127 cd->max_delta_ns = clockevent_delta2ns(0x7fffff, cd);
128 cd->min_delta_ns = clockevent_delta2ns(2, cd);
131 cd->cpumask = cpumask_of(cpu);
132 cd->set_next_event = sibyte_next_event;
133 cd->set_mode = sibyte_set_mode;
134 clockevents_register_device(cd);
136 bcm1480_mask_irq(cpu, irq);
139 * Map the timer interrupt to IP[4] of this cpu
141 __raw_writeq(IMR_IP4_VAL,
142 IOADDR(A_BCM1480_IMR_REGISTER(cpu,
143 R_BCM1480_IMR_INTERRUPT_MAP_BASE_H) + (irq << 3)));
145 bcm1480_unmask_irq(cpu, irq);
147 action->handler = sibyte_counter_handler;
148 action->flags = IRQF_PERCPU | IRQF_TIMER;
152 irq_set_affinity(irq, cpumask_of(cpu));
153 setup_irq(irq, action);