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1/*
2 * Copyright (C) 2000,2001,2004 Broadcom Corporation
3 *
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.
8 *
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.
13 *
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.
17 */
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>
23
24#include <asm/addrspace.h>
25#include <asm/io.h>
26#include <asm/time.h>
27
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>
32
33#include <asm/sibyte/sb1250.h>
34
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
38
39/*
40 * The general purpose timer ticks at 1MHz independent if
41 * the rest of the system
42 */
43static void sibyte_set_mode(enum clock_event_mode mode,
44 struct clock_event_device *evt)
45{
46 unsigned int cpu = smp_processor_id();
47 void __iomem *cfg, *init;
48
49 cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
50 init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
51
52 switch (mode) {
53 case CLOCK_EVT_MODE_PERIODIC:
54 __raw_writeq(0, cfg);
55 __raw_writeq((V_SCD_TIMER_FREQ / HZ) - 1, init);
56 __raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS,
57 cfg);
58 break;
59
60 case CLOCK_EVT_MODE_ONESHOT:
61 /* Stop the timer until we actually program a shot */
62 case CLOCK_EVT_MODE_SHUTDOWN:
63 __raw_writeq(0, cfg);
64 break;
65
66 case CLOCK_EVT_MODE_UNUSED: /* shuddup gcc */
67 case CLOCK_EVT_MODE_RESUME:
68 ;
69 }
70}
71
72static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
73{
74 unsigned int cpu = smp_processor_id();
75 void __iomem *cfg, *init;
76
77 cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
78 init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
79
80 __raw_writeq(0, cfg);
81 __raw_writeq(delta - 1, init);
82 __raw_writeq(M_SCD_TIMER_ENABLE, cfg);
83
84 return 0;
85}
86
87static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
88{
89 unsigned int cpu = smp_processor_id();
90 struct clock_event_device *cd = dev_id;
91 void __iomem *cfg;
92 unsigned long tmode;
93
94 if (cd->mode == CLOCK_EVT_MODE_PERIODIC)
95 tmode = M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS;
96 else
97 tmode = 0;
98
99 /* ACK interrupt */
100 cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
101 ____raw_writeq(tmode, cfg);
102
103 cd->event_handler(cd);
104
105 return IRQ_HANDLED;
106}
107
108static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
109static DEFINE_PER_CPU(struct irqaction, sibyte_hpt_irqaction);
110static DEFINE_PER_CPU(char [18], sibyte_hpt_name);
111
112void __cpuinit sb1480_clockevent_init(void)
113{
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);
119
120 BUG_ON(cpu > 3); /* Only have 4 general purpose timers */
121
122 sprintf(name, "bcm1480-counter-%d", cpu);
123 cd->name = name;
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);
129 cd->rating = 200;
130 cd->irq = irq;
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);
135
136 bcm1480_mask_irq(cpu, irq);
137
138 /*
139 * Map the timer interrupt to IP[4] of this cpu
140 */
141 __raw_writeq(IMR_IP4_VAL,
142 IOADDR(A_BCM1480_IMR_REGISTER(cpu,
143 R_BCM1480_IMR_INTERRUPT_MAP_BASE_H) + (irq << 3)));
144
145 bcm1480_unmask_irq(cpu, irq);
146
147 action->handler = sibyte_counter_handler;
148 action->flags = IRQF_PERCPU | IRQF_TIMER;
149 action->name = name;
150 action->dev_id = cd;
151
152 irq_set_affinity(irq, cpumask_of(cpu));
153 setup_irq(irq, action);
154}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2000,2001,2004 Broadcom Corporation
4 */
5#include <linux/clockchips.h>
6#include <linux/interrupt.h>
7#include <linux/percpu.h>
8#include <linux/smp.h>
9#include <linux/irq.h>
10
11#include <asm/addrspace.h>
12#include <asm/io.h>
13#include <asm/time.h>
14
15#include <asm/sibyte/bcm1480_regs.h>
16#include <asm/sibyte/sb1250_regs.h>
17#include <asm/sibyte/bcm1480_int.h>
18#include <asm/sibyte/bcm1480_scd.h>
19
20#include <asm/sibyte/sb1250.h>
21
22#define IMR_IP2_VAL K_BCM1480_INT_MAP_I0
23#define IMR_IP3_VAL K_BCM1480_INT_MAP_I1
24#define IMR_IP4_VAL K_BCM1480_INT_MAP_I2
25
26/*
27 * The general purpose timer ticks at 1MHz independent if
28 * the rest of the system
29 */
30
31static int sibyte_set_periodic(struct clock_event_device *evt)
32{
33 unsigned int cpu = smp_processor_id();
34 void __iomem *cfg, *init;
35
36 cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
37 init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
38
39 __raw_writeq(0, cfg);
40 __raw_writeq((V_SCD_TIMER_FREQ / HZ) - 1, init);
41 __raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS, cfg);
42 return 0;
43}
44
45static int sibyte_shutdown(struct clock_event_device *evt)
46{
47 unsigned int cpu = smp_processor_id();
48 void __iomem *cfg;
49
50 cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
51
52 /* Stop the timer until we actually program a shot */
53 __raw_writeq(0, cfg);
54 return 0;
55}
56
57static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
58{
59 unsigned int cpu = smp_processor_id();
60 void __iomem *cfg, *init;
61
62 cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
63 init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
64
65 __raw_writeq(0, cfg);
66 __raw_writeq(delta - 1, init);
67 __raw_writeq(M_SCD_TIMER_ENABLE, cfg);
68
69 return 0;
70}
71
72static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
73{
74 unsigned int cpu = smp_processor_id();
75 struct clock_event_device *cd = dev_id;
76 void __iomem *cfg;
77 unsigned long tmode;
78
79 if (clockevent_state_periodic(cd))
80 tmode = M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS;
81 else
82 tmode = 0;
83
84 /* ACK interrupt */
85 cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
86 ____raw_writeq(tmode, cfg);
87
88 cd->event_handler(cd);
89
90 return IRQ_HANDLED;
91}
92
93static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
94static DEFINE_PER_CPU(char [18], sibyte_hpt_name);
95
96void sb1480_clockevent_init(void)
97{
98 unsigned int cpu = smp_processor_id();
99 unsigned int irq = K_BCM1480_INT_TIMER_0 + cpu;
100 struct clock_event_device *cd = &per_cpu(sibyte_hpt_clockevent, cpu);
101 unsigned char *name = per_cpu(sibyte_hpt_name, cpu);
102 unsigned long flags = IRQF_PERCPU | IRQF_TIMER;
103
104 BUG_ON(cpu > 3); /* Only have 4 general purpose timers */
105
106 sprintf(name, "bcm1480-counter-%d", cpu);
107 cd->name = name;
108 cd->features = CLOCK_EVT_FEAT_PERIODIC |
109 CLOCK_EVT_FEAT_ONESHOT;
110 clockevent_set_clock(cd, V_SCD_TIMER_FREQ);
111 cd->max_delta_ns = clockevent_delta2ns(0x7fffff, cd);
112 cd->max_delta_ticks = 0x7fffff;
113 cd->min_delta_ns = clockevent_delta2ns(2, cd);
114 cd->min_delta_ticks = 2;
115 cd->rating = 200;
116 cd->irq = irq;
117 cd->cpumask = cpumask_of(cpu);
118 cd->set_next_event = sibyte_next_event;
119 cd->set_state_shutdown = sibyte_shutdown;
120 cd->set_state_periodic = sibyte_set_periodic;
121 cd->set_state_oneshot = sibyte_shutdown;
122 clockevents_register_device(cd);
123
124 bcm1480_mask_irq(cpu, irq);
125
126 /*
127 * Map the timer interrupt to IP[4] of this cpu
128 */
129 __raw_writeq(IMR_IP4_VAL,
130 IOADDR(A_BCM1480_IMR_REGISTER(cpu,
131 R_BCM1480_IMR_INTERRUPT_MAP_BASE_H) + (irq << 3)));
132
133 bcm1480_unmask_irq(cpu, irq);
134
135 irq_set_affinity(irq, cpumask_of(cpu));
136 if (request_irq(irq, sibyte_counter_handler, flags, name, cd))
137 pr_err("Failed to request irq %d (%s)\n", irq, name);
138}