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

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

Version: ~ [ linux-5.15-rc1 ] ~ [ linux-5.14.5 ] ~ [ linux-5.13.18 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.66 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.147 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.206 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.246 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.282 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.283 ] ~ [ 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 // 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 
 31 static 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 
 45 static 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 
 57 static 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 
 72 static 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 
 93 static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
 94 static DEFINE_PER_CPU(char [18], sibyte_hpt_name);
 95 
 96 void 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 }
139 

~ [ 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