~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/mips/kernel/cevt-bcm1480.c

Version: ~ [ linux-5.15-rc5 ] ~ [ linux-5.14.11 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.72 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.152 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.210 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.250 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.286 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.288 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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  */
 43 
 44 static int sibyte_set_periodic(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         __raw_writeq(0, cfg);
 53         __raw_writeq((V_SCD_TIMER_FREQ / HZ) - 1, init);
 54         __raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS, cfg);
 55         return 0;
 56 }
 57 
 58 static int sibyte_shutdown(struct clock_event_device *evt)
 59 {
 60         unsigned int cpu = smp_processor_id();
 61         void __iomem *cfg;
 62 
 63         cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
 64 
 65         /* Stop the timer until we actually program a shot */
 66         __raw_writeq(0, cfg);
 67         return 0;
 68 }
 69 
 70 static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
 71 {
 72         unsigned int cpu = smp_processor_id();
 73         void __iomem *cfg, *init;
 74 
 75         cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
 76         init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
 77 
 78         __raw_writeq(0, cfg);
 79         __raw_writeq(delta - 1, init);
 80         __raw_writeq(M_SCD_TIMER_ENABLE, cfg);
 81 
 82         return 0;
 83 }
 84 
 85 static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
 86 {
 87         unsigned int cpu = smp_processor_id();
 88         struct clock_event_device *cd = dev_id;
 89         void __iomem *cfg;
 90         unsigned long tmode;
 91 
 92         if (clockevent_state_periodic(cd))
 93                 tmode = M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS;
 94         else
 95                 tmode = 0;
 96 
 97         /* ACK interrupt */
 98         cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
 99         ____raw_writeq(tmode, cfg);
100 
101         cd->event_handler(cd);
102 
103         return IRQ_HANDLED;
104 }
105 
106 static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
107 static DEFINE_PER_CPU(struct irqaction, sibyte_hpt_irqaction);
108 static DEFINE_PER_CPU(char [18], sibyte_hpt_name);
109 
110 void sb1480_clockevent_init(void)
111 {
112         unsigned int cpu = smp_processor_id();
113         unsigned int irq = K_BCM1480_INT_TIMER_0 + cpu;
114         struct irqaction *action = &per_cpu(sibyte_hpt_irqaction, cpu);
115         struct clock_event_device *cd = &per_cpu(sibyte_hpt_clockevent, cpu);
116         unsigned char *name = per_cpu(sibyte_hpt_name, cpu);
117 
118         BUG_ON(cpu > 3);        /* Only have 4 general purpose timers */
119 
120         sprintf(name, "bcm1480-counter-%d", cpu);
121         cd->name                = name;
122         cd->features            = CLOCK_EVT_FEAT_PERIODIC |
123                                   CLOCK_EVT_FEAT_ONESHOT;
124         clockevent_set_clock(cd, V_SCD_TIMER_FREQ);
125         cd->max_delta_ns        = clockevent_delta2ns(0x7fffff, cd);
126         cd->max_delta_ticks     = 0x7fffff;
127         cd->min_delta_ns        = clockevent_delta2ns(2, cd);
128         cd->min_delta_ticks     = 2;
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_state_shutdown  = sibyte_shutdown;
134         cd->set_state_periodic  = sibyte_set_periodic;
135         cd->set_state_oneshot   = sibyte_shutdown;
136         clockevents_register_device(cd);
137 
138         bcm1480_mask_irq(cpu, irq);
139 
140         /*
141          * Map the timer interrupt to IP[4] of this cpu
142          */
143         __raw_writeq(IMR_IP4_VAL,
144                      IOADDR(A_BCM1480_IMR_REGISTER(cpu,
145                         R_BCM1480_IMR_INTERRUPT_MAP_BASE_H) + (irq << 3)));
146 
147         bcm1480_unmask_irq(cpu, irq);
148 
149         action->handler = sibyte_counter_handler;
150         action->flags   = IRQF_PERCPU | IRQF_TIMER;
151         action->name    = name;
152         action->dev_id  = cd;
153 
154         irq_set_affinity(irq, cpumask_of(cpu));
155         setup_irq(irq, action);
156 }
157 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp