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-rw-r--r--arch/arm/mach-imx/time.c220
1 files changed, 0 insertions, 220 deletions
diff --git a/arch/arm/mach-imx/time.c b/arch/arm/mach-imx/time.c
deleted file mode 100644
index 5aef18b599e5..000000000000
--- a/arch/arm/mach-imx/time.c
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@@ -1,220 +0,0 @@
1/*
2 * linux/arch/arm/mach-imx/time.c
3 *
4 * Copyright (C) 2000-2001 Deep Blue Solutions
5 * Copyright (C) 2002 Shane Nay (shane@minirl.com)
6 * Copyright (C) 2006-2007 Pavel Pisa (ppisa@pikron.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <linux/kernel.h>
13#include <linux/sched.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/irq.h>
17#include <linux/time.h>
18#include <linux/clocksource.h>
19#include <linux/clockchips.h>
20#include <linux/clk.h>
21#include <linux/io.h>
22
23#include <mach/hardware.h>
24#include <asm/leds.h>
25#include <asm/irq.h>
26#include <asm/mach/time.h>
27
28/* Use timer 1 as system timer */
29#define TIMER_BASE IMX_TIM1_BASE
30
31static struct clock_event_device clockevent_imx;
32static enum clock_event_mode clockevent_mode = CLOCK_EVT_MODE_UNUSED;
33
34/*
35 * IRQ handler for the timer
36 */
37static irqreturn_t
38imx_timer_interrupt(int irq, void *dev_id)
39{
40 struct clock_event_device *evt = &clockevent_imx;
41 uint32_t tstat;
42 irqreturn_t ret = IRQ_NONE;
43
44 /* clear the interrupt */
45 tstat = IMX_TSTAT(TIMER_BASE);
46 IMX_TSTAT(TIMER_BASE) = 0;
47
48 if (tstat & TSTAT_COMP) {
49 evt->event_handler(evt);
50 ret = IRQ_HANDLED;
51 }
52
53 return ret;
54}
55
56static struct irqaction imx_timer_irq = {
57 .name = "i.MX Timer Tick",
58 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
59 .handler = imx_timer_interrupt,
60};
61
62/*
63 * Set up timer hardware into expected mode and state.
64 */
65static void __init imx_timer_hardware_init(void)
66{
67 /*
68 * Initialise to a known state (all timers off, and timing reset)
69 */
70 IMX_TCTL(TIMER_BASE) = 0;
71 IMX_TPRER(TIMER_BASE) = 0;
72
73 IMX_TCTL(TIMER_BASE) = TCTL_FRR | TCTL_CLK_PCLK1 | TCTL_TEN;
74}
75
76cycle_t imx_get_cycles(struct clocksource *cs)
77{
78 return IMX_TCN(TIMER_BASE);
79}
80
81static struct clocksource clocksource_imx = {
82 .name = "imx_timer1",
83 .rating = 200,
84 .read = imx_get_cycles,
85 .mask = 0xFFFFFFFF,
86 .shift = 20,
87 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
88};
89
90static int __init imx_clocksource_init(unsigned long rate)
91{
92 clocksource_imx.mult =
93 clocksource_hz2mult(rate, clocksource_imx.shift);
94 clocksource_register(&clocksource_imx);
95
96 return 0;
97}
98
99static int imx_set_next_event(unsigned long evt,
100 struct clock_event_device *unused)
101{
102 unsigned long tcmp;
103
104 tcmp = IMX_TCN(TIMER_BASE) + evt;
105 IMX_TCMP(TIMER_BASE) = tcmp;
106
107 return (int32_t)(tcmp - IMX_TCN(TIMER_BASE)) < 0 ? -ETIME : 0;
108}
109
110#ifdef DEBUG
111static const char *clock_event_mode_label[]={
112 [CLOCK_EVT_MODE_PERIODIC] = "CLOCK_EVT_MODE_PERIODIC",
113 [CLOCK_EVT_MODE_ONESHOT] = "CLOCK_EVT_MODE_ONESHOT",
114 [CLOCK_EVT_MODE_SHUTDOWN] = "CLOCK_EVT_MODE_SHUTDOWN",
115 [CLOCK_EVT_MODE_UNUSED] = "CLOCK_EVT_MODE_UNUSED"
116};
117#endif /*DEBUG*/
118
119static void imx_set_mode(enum clock_event_mode mode, struct clock_event_device *evt)
120{
121 unsigned long flags;
122
123 /*
124 * The timer interrupt generation is disabled at least
125 * for enough time to call imx_set_next_event()
126 */
127 local_irq_save(flags);
128 /* Disable interrupt in GPT module */
129 IMX_TCTL(TIMER_BASE) &= ~TCTL_IRQEN;
130 if (mode != clockevent_mode) {
131 /* Set event time into far-far future */
132 IMX_TCMP(TIMER_BASE) = IMX_TCN(TIMER_BASE) - 3;
133 /* Clear pending interrupt */
134 IMX_TSTAT(TIMER_BASE) &= ~TSTAT_COMP;
135 }
136
137#ifdef DEBUG
138 printk(KERN_INFO "imx_set_mode: changing mode from %s to %s\n",
139 clock_event_mode_label[clockevent_mode], clock_event_mode_label[mode]);
140#endif /*DEBUG*/
141
142 /* Remember timer mode */
143 clockevent_mode = mode;
144 local_irq_restore(flags);
145
146 switch (mode) {
147 case CLOCK_EVT_MODE_PERIODIC:
148 printk(KERN_ERR "imx_set_mode: Periodic mode is not supported for i.MX\n");
149 break;
150 case CLOCK_EVT_MODE_ONESHOT:
151 /*
152 * Do not put overhead of interrupt enable/disable into
153 * imx_set_next_event(), the core has about 4 minutes
154 * to call imx_set_next_event() or shutdown clock after
155 * mode switching
156 */
157 local_irq_save(flags);
158 IMX_TCTL(TIMER_BASE) |= TCTL_IRQEN;
159 local_irq_restore(flags);
160 break;
161 case CLOCK_EVT_MODE_SHUTDOWN:
162 case CLOCK_EVT_MODE_UNUSED:
163 case CLOCK_EVT_MODE_RESUME:
164 /* Left event sources disabled, no more interrupts appears */
165 break;
166 }
167}
168
169static struct clock_event_device clockevent_imx = {
170 .name = "imx_timer1",
171 .features = CLOCK_EVT_FEAT_ONESHOT,
172 .shift = 32,
173 .set_mode = imx_set_mode,
174 .set_next_event = imx_set_next_event,
175 .rating = 200,
176};
177
178static int __init imx_clockevent_init(unsigned long rate)
179{
180 clockevent_imx.mult = div_sc(rate, NSEC_PER_SEC,
181 clockevent_imx.shift);
182 clockevent_imx.max_delta_ns =
183 clockevent_delta2ns(0xfffffffe, &clockevent_imx);
184 clockevent_imx.min_delta_ns =
185 clockevent_delta2ns(0xf, &clockevent_imx);
186
187 clockevent_imx.cpumask = cpumask_of(0);
188
189 clockevents_register_device(&clockevent_imx);
190
191 return 0;
192}
193
194extern int imx_clocks_init(void);
195
196static void __init imx_timer_init(void)
197{
198 struct clk *clk;
199 unsigned long rate;
200
201 imx_clocks_init();
202
203 clk = clk_get(NULL, "perclk1");
204 clk_enable(clk);
205 rate = clk_get_rate(clk);
206
207 imx_timer_hardware_init();
208 imx_clocksource_init(rate);
209
210 imx_clockevent_init(rate);
211
212 /*
213 * Make irqs happen for the system timer
214 */
215 setup_irq(TIM1_INT, &imx_timer_irq);
216}
217
218struct sys_timer imx_timer = {
219 .init = imx_timer_init,
220};
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-25 00:37:20 -0400