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

TOMOYO Linux Cross Reference
Linux/arch/arm/plat-iop/time.c

Version: ~ [ linux-6.1-rc7 ] ~ [ linux-6.0.10 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.80 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.156 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.225 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.267 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.300 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.334 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * arch/arm/plat-iop/time.c
  3  *
  4  * Timer code for IOP32x and IOP33x based systems
  5  *
  6  * Author: Deepak Saxena <dsaxena@mvista.com>
  7  *
  8  * Copyright 2002-2003 MontaVista Software Inc.
  9  *
 10  * This program is free software; you can redistribute it and/or modify it
 11  * under the terms of the GNU General Public License as published by the
 12  * Free Software Foundation; either version 2 of the License, or (at your
 13  * option) any later version.
 14  */
 15 
 16 #include <linux/kernel.h>
 17 #include <linux/interrupt.h>
 18 #include <linux/time.h>
 19 #include <linux/init.h>
 20 #include <linux/timex.h>
 21 #include <linux/io.h>
 22 #include <linux/clocksource.h>
 23 #include <linux/clockchips.h>
 24 #include <linux/export.h>
 25 #include <linux/sched_clock.h>
 26 #include <mach/hardware.h>
 27 #include <asm/irq.h>
 28 #include <linux/uaccess.h>
 29 #include <asm/mach/irq.h>
 30 #include <asm/mach/time.h>
 31 #include <mach/time.h>
 32 
 33 /*
 34  * Minimum clocksource/clockevent timer range in seconds
 35  */
 36 #define IOP_MIN_RANGE 4
 37 
 38 /*
 39  * IOP clocksource (free-running timer 1).
 40  */
 41 static u64 notrace iop_clocksource_read(struct clocksource *unused)
 42 {
 43         return 0xffffffffu - read_tcr1();
 44 }
 45 
 46 static struct clocksource iop_clocksource = {
 47         .name           = "iop_timer1",
 48         .rating         = 300,
 49         .read           = iop_clocksource_read,
 50         .mask           = CLOCKSOURCE_MASK(32),
 51         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 52 };
 53 
 54 /*
 55  * IOP sched_clock() implementation via its clocksource.
 56  */
 57 static u64 notrace iop_read_sched_clock(void)
 58 {
 59         return 0xffffffffu - read_tcr1();
 60 }
 61 
 62 /*
 63  * IOP clockevents (interrupting timer 0).
 64  */
 65 static int iop_set_next_event(unsigned long delta,
 66                               struct clock_event_device *unused)
 67 {
 68         u32 tmr = IOP_TMR_PRIVILEGED | IOP_TMR_RATIO_1_1;
 69 
 70         BUG_ON(delta == 0);
 71         write_tmr0(tmr & ~(IOP_TMR_EN | IOP_TMR_RELOAD));
 72         write_tcr0(delta);
 73         write_tmr0((tmr & ~IOP_TMR_RELOAD) | IOP_TMR_EN);
 74 
 75         return 0;
 76 }
 77 
 78 static unsigned long ticks_per_jiffy;
 79 
 80 static int iop_set_periodic(struct clock_event_device *evt)
 81 {
 82         u32 tmr = read_tmr0();
 83 
 84         write_tmr0(tmr & ~IOP_TMR_EN);
 85         write_tcr0(ticks_per_jiffy - 1);
 86         write_trr0(ticks_per_jiffy - 1);
 87         tmr |= (IOP_TMR_RELOAD | IOP_TMR_EN);
 88 
 89         write_tmr0(tmr);
 90         return 0;
 91 }
 92 
 93 static int iop_set_oneshot(struct clock_event_device *evt)
 94 {
 95         u32 tmr = read_tmr0();
 96 
 97         /* ->set_next_event sets period and enables timer */
 98         tmr &= ~(IOP_TMR_RELOAD | IOP_TMR_EN);
 99         write_tmr0(tmr);
100         return 0;
101 }
102 
103 static int iop_shutdown(struct clock_event_device *evt)
104 {
105         u32 tmr = read_tmr0();
106 
107         tmr &= ~IOP_TMR_EN;
108         write_tmr0(tmr);
109         return 0;
110 }
111 
112 static int iop_resume(struct clock_event_device *evt)
113 {
114         u32 tmr = read_tmr0();
115 
116         tmr |= IOP_TMR_EN;
117         write_tmr0(tmr);
118         return 0;
119 }
120 
121 static struct clock_event_device iop_clockevent = {
122         .name                   = "iop_timer0",
123         .features               = CLOCK_EVT_FEAT_PERIODIC |
124                                   CLOCK_EVT_FEAT_ONESHOT,
125         .rating                 = 300,
126         .set_next_event         = iop_set_next_event,
127         .set_state_shutdown     = iop_shutdown,
128         .set_state_periodic     = iop_set_periodic,
129         .tick_resume            = iop_resume,
130         .set_state_oneshot      = iop_set_oneshot,
131 };
132 
133 static irqreturn_t
134 iop_timer_interrupt(int irq, void *dev_id)
135 {
136         struct clock_event_device *evt = dev_id;
137 
138         write_tisr(1);
139         evt->event_handler(evt);
140         return IRQ_HANDLED;
141 }
142 
143 static struct irqaction iop_timer_irq = {
144         .name           = "IOP Timer Tick",
145         .handler        = iop_timer_interrupt,
146         .flags          = IRQF_TIMER | IRQF_IRQPOLL,
147         .dev_id         = &iop_clockevent,
148 };
149 
150 static unsigned long iop_tick_rate;
151 unsigned long get_iop_tick_rate(void)
152 {
153         return iop_tick_rate;
154 }
155 EXPORT_SYMBOL(get_iop_tick_rate);
156 
157 void __init iop_init_time(unsigned long tick_rate)
158 {
159         u32 timer_ctl;
160 
161         sched_clock_register(iop_read_sched_clock, 32, tick_rate);
162 
163         ticks_per_jiffy = DIV_ROUND_CLOSEST(tick_rate, HZ);
164         iop_tick_rate = tick_rate;
165 
166         timer_ctl = IOP_TMR_EN | IOP_TMR_PRIVILEGED |
167                         IOP_TMR_RELOAD | IOP_TMR_RATIO_1_1;
168 
169         /*
170          * Set up interrupting clockevent timer 0.
171          */
172         write_tmr0(timer_ctl & ~IOP_TMR_EN);
173         write_tisr(1);
174         setup_irq(IRQ_IOP_TIMER0, &iop_timer_irq);
175         iop_clockevent.cpumask = cpumask_of(0);
176         clockevents_config_and_register(&iop_clockevent, tick_rate,
177                                         0xf, 0xfffffffe);
178 
179         /*
180          * Set up free-running clocksource timer 1.
181          */
182         write_trr1(0xffffffff);
183         write_tcr1(0xffffffff);
184         write_tmr1(timer_ctl);
185         clocksource_register_hz(&iop_clocksource, tick_rate);
186 }
187 

~ [ 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