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Sascha Hauerbb6d8c82006-06-19 15:27:53 +01001/*
2 * arch/arm/mach-netx/time.c
3 *
4 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/init.h>
21#include <linux/interrupt.h>
Sascha Hauer1a815ae2006-12-12 09:23:45 +010022#include <linux/irq.h>
23#include <linux/clocksource.h>
Uwe Kleine-König2fcfe6b2008-12-09 21:57:24 +010024#include <linux/clockchips.h>
Russell Kingfced80c2008-09-06 12:10:45 +010025#include <linux/io.h>
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010026
Russell Kinga09e64f2008-08-05 16:14:15 +010027#include <mach/hardware.h>
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010028#include <asm/mach/time.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010029#include <mach/netx-regs.h>
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010030
Uwe Kleine-König5e3e2762013-11-12 20:56:02 +010031#define NETX_CLOCK_FREQ 100000000
32#define NETX_LATCH DIV_ROUND_CLOSEST(NETX_CLOCK_FREQ, HZ)
33
Uwe Kleine-König2fcfe6b2008-12-09 21:57:24 +010034#define TIMER_CLOCKEVENT 0
Uwe Kleine-König24e78572008-12-09 21:57:22 +010035#define TIMER_CLOCKSOURCE 1
36
Uwe Kleine-König2fcfe6b2008-12-09 21:57:24 +010037static void netx_set_mode(enum clock_event_mode mode,
38 struct clock_event_device *clk)
39{
40 u32 tmode;
41
42 /* disable timer */
43 writel(0, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKEVENT));
44
45 switch (mode) {
46 case CLOCK_EVT_MODE_PERIODIC:
Uwe Kleine-König5e3e2762013-11-12 20:56:02 +010047 writel(NETX_LATCH, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKEVENT));
Uwe Kleine-König2fcfe6b2008-12-09 21:57:24 +010048 tmode = NETX_GPIO_COUNTER_CTRL_RST_EN |
49 NETX_GPIO_COUNTER_CTRL_IRQ_EN |
50 NETX_GPIO_COUNTER_CTRL_RUN;
51 break;
52
53 case CLOCK_EVT_MODE_ONESHOT:
54 writel(0, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKEVENT));
55 tmode = NETX_GPIO_COUNTER_CTRL_IRQ_EN |
56 NETX_GPIO_COUNTER_CTRL_RUN;
57 break;
58
59 default:
60 WARN(1, "%s: unhandled mode %d\n", __func__, mode);
61 /* fall through */
62
63 case CLOCK_EVT_MODE_SHUTDOWN:
64 case CLOCK_EVT_MODE_UNUSED:
65 case CLOCK_EVT_MODE_RESUME:
66 tmode = 0;
67 break;
68 }
69
70 writel(tmode, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKEVENT));
71}
72
73static int netx_set_next_event(unsigned long evt,
74 struct clock_event_device *clk)
75{
76 writel(0 - evt, NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKEVENT));
77 return 0;
78}
79
80static struct clock_event_device netx_clockevent = {
81 .name = "netx-timer" __stringify(TIMER_CLOCKEVENT),
Uwe Kleine-König2fcfe6b2008-12-09 21:57:24 +010082 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
83 .set_next_event = netx_set_next_event,
84 .set_mode = netx_set_mode,
85};
86
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010087/*
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010088 * IRQ handler for the timer
89 */
90static irqreturn_t
Linus Torvalds0cd61b62006-10-06 10:53:39 -070091netx_timer_interrupt(int irq, void *dev_id)
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010092{
Uwe Kleine-König2fcfe6b2008-12-09 21:57:24 +010093 struct clock_event_device *evt = &netx_clockevent;
Sascha Hauer1a815ae2006-12-12 09:23:45 +010094
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010095 /* acknowledge interrupt */
96 writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
97
Uwe Kleine-König2fcfe6b2008-12-09 21:57:24 +010098 evt->event_handler(evt);
99
Sascha Hauerbb6d8c82006-06-19 15:27:53 +0100100 return IRQ_HANDLED;
101}
102
Sascha Hauerbb6d8c82006-06-19 15:27:53 +0100103static struct irqaction netx_timer_irq = {
Uwe Kleine-König98538482008-12-09 21:57:21 +0100104 .name = "NetX Timer Tick",
Michael Opdenacker78f6db92014-03-04 22:04:50 +0100105 .flags = IRQF_TIMER | IRQF_IRQPOLL,
Uwe Kleine-König98538482008-12-09 21:57:21 +0100106 .handler = netx_timer_interrupt,
Sascha Hauerbb6d8c82006-06-19 15:27:53 +0100107};
108
109/*
110 * Set up timer interrupt
111 */
Stephen Warren6bb27d72012-11-08 12:40:59 -0700112void __init netx_timer_init(void)
Sascha Hauerbb6d8c82006-06-19 15:27:53 +0100113{
114 /* disable timer initially */
115 writel(0, NETX_GPIO_COUNTER_CTRL(0));
116
117 /* Reset the timer value to zero */
118 writel(0, NETX_GPIO_COUNTER_CURRENT(0));
119
Uwe Kleine-König5e3e2762013-11-12 20:56:02 +0100120 writel(NETX_LATCH, NETX_GPIO_COUNTER_MAX(0));
Sascha Hauerbb6d8c82006-06-19 15:27:53 +0100121
122 /* acknowledge interrupt */
123 writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
124
Uwe Kleine-König98538482008-12-09 21:57:21 +0100125 /* Enable the interrupt in the specific timer
126 * register and start timer
127 */
Sascha Hauerbb6d8c82006-06-19 15:27:53 +0100128 writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE);
129 writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN,
Uwe Kleine-König98538482008-12-09 21:57:21 +0100130 NETX_GPIO_COUNTER_CTRL(0));
Sascha Hauerbb6d8c82006-06-19 15:27:53 +0100131
132 setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq);
Sascha Hauer1a815ae2006-12-12 09:23:45 +0100133
134 /* Setup timer one for clocksource */
Uwe Kleine-König24e78572008-12-09 21:57:22 +0100135 writel(0, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKSOURCE));
136 writel(0, NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKSOURCE));
137 writel(0xffffffff, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKSOURCE));
Sascha Hauer1a815ae2006-12-12 09:23:45 +0100138
Uwe Kleine-König98538482008-12-09 21:57:21 +0100139 writel(NETX_GPIO_COUNTER_CTRL_RUN,
Uwe Kleine-König24e78572008-12-09 21:57:22 +0100140 NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKSOURCE));
Sascha Hauer1a815ae2006-12-12 09:23:45 +0100141
Russell King234b6ced2011-05-08 14:09:47 +0100142 clocksource_mmio_init(NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKSOURCE),
Uwe Kleine-König5e3e2762013-11-12 20:56:02 +0100143 "netx_timer", NETX_CLOCK_FREQ, 200, 32, clocksource_mmio_readl_up);
Uwe Kleine-König2fcfe6b2008-12-09 21:57:24 +0100144
Uwe Kleine-König2fcfe6b2008-12-09 21:57:24 +0100145 /* with max_delta_ns >= delta2ns(0x800) the system currently runs fine.
146 * Adding some safety ... */
Russell King29279262009-01-08 12:02:27 +0000147 netx_clockevent.cpumask = cpumask_of(0);
Uwe Kleine-König5e3e2762013-11-12 20:56:02 +0100148 clockevents_config_and_register(&netx_clockevent, NETX_CLOCK_FREQ,
Shawn Guo838a2ae2013-01-12 11:50:05 +0000149 0xa00, 0xfffffffe);
Sascha Hauerbb6d8c82006-06-19 15:27:53 +0100150}