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-rw-r--r--Documentation/devicetree/bindings/timer/lsi,zevio-timer.txt33
-rw-r--r--drivers/clocksource/Makefile1
-rw-r--r--drivers/clocksource/zevio-timer.c215
3 files changed, 249 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/timer/lsi,zevio-timer.txt b/Documentation/devicetree/bindings/timer/lsi,zevio-timer.txt
new file mode 100644
index 000000000000..b2d07ad90e9a
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/lsi,zevio-timer.txt
@@ -0,0 +1,33 @@
1TI-NSPIRE timer
2
3Required properties:
4
5- compatible : should be "lsi,zevio-timer".
6- reg : The physical base address and size of the timer (always first).
7- clocks: phandle to the source clock.
8
9Optional properties:
10
11- interrupts : The interrupt number of the first timer.
12- reg : The interrupt acknowledgement registers
13 (always after timer base address)
14
15If any of the optional properties are not given, the timer is added as a
16clock-source only.
17
18Example:
19
20timer {
21 compatible = "lsi,zevio-timer";
22 reg = <0x900D0000 0x1000>, <0x900A0020 0x8>;
23 interrupts = <19>;
24 clocks = <&timer_clk>;
25};
26
27Example (no clock-events):
28
29timer {
30 compatible = "lsi,zevio-timer";
31 reg = <0x900D0000 0x1000>;
32 clocks = <&timer_clk>;
33};
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 36a9ac105d55..4853ea0f8fd5 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_ARCH_PRIMA2) += timer-prima2.o
22obj-$(CONFIG_SUN4I_TIMER) += sun4i_timer.o 22obj-$(CONFIG_SUN4I_TIMER) += sun4i_timer.o
23obj-$(CONFIG_ARCH_TEGRA) += tegra20_timer.o 23obj-$(CONFIG_ARCH_TEGRA) += tegra20_timer.o
24obj-$(CONFIG_VT8500_TIMER) += vt8500_timer.o 24obj-$(CONFIG_VT8500_TIMER) += vt8500_timer.o
25obj-$(CONFIG_ARCH_NSPIRE) += zevio-timer.o
25obj-$(CONFIG_ARCH_BCM) += bcm_kona_timer.o 26obj-$(CONFIG_ARCH_BCM) += bcm_kona_timer.o
26obj-$(CONFIG_CADENCE_TTC_TIMER) += cadence_ttc_timer.o 27obj-$(CONFIG_CADENCE_TTC_TIMER) += cadence_ttc_timer.o
27obj-$(CONFIG_CLKSRC_EXYNOS_MCT) += exynos_mct.o 28obj-$(CONFIG_CLKSRC_EXYNOS_MCT) += exynos_mct.o
diff --git a/drivers/clocksource/zevio-timer.c b/drivers/clocksource/zevio-timer.c
new file mode 100644
index 000000000000..ca81809d159d
--- /dev/null
+++ b/drivers/clocksource/zevio-timer.c
@@ -0,0 +1,215 @@
1/*
2 * linux/drivers/clocksource/zevio-timer.c
3 *
4 * Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
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, as
8 * published by the Free Software Foundation.
9 *
10 */
11
12#include <linux/io.h>
13#include <linux/irq.h>
14#include <linux/of.h>
15#include <linux/of_address.h>
16#include <linux/of_irq.h>
17#include <linux/clk.h>
18#include <linux/clockchips.h>
19#include <linux/cpumask.h>
20#include <linux/interrupt.h>
21#include <linux/slab.h>
22
23#define IO_CURRENT_VAL 0x00
24#define IO_DIVIDER 0x04
25#define IO_CONTROL 0x08
26
27#define IO_TIMER1 0x00
28#define IO_TIMER2 0x0C
29
30#define IO_MATCH_BEGIN 0x18
31#define IO_MATCH(x) (IO_MATCH_BEGIN + ((x) << 2))
32
33#define IO_INTR_STS 0x00
34#define IO_INTR_ACK 0x00
35#define IO_INTR_MSK 0x04
36
37#define CNTL_STOP_TIMER (1 << 4)
38#define CNTL_RUN_TIMER (0 << 4)
39
40#define CNTL_INC (1 << 3)
41#define CNTL_DEC (0 << 3)
42
43#define CNTL_TOZERO 0
44#define CNTL_MATCH(x) ((x) + 1)
45#define CNTL_FOREVER 7
46
47/* There are 6 match registers but we only use one. */
48#define TIMER_MATCH 0
49
50#define TIMER_INTR_MSK (1 << (TIMER_MATCH))
51#define TIMER_INTR_ALL 0x3F
52
53struct zevio_timer {
54 void __iomem *base;
55 void __iomem *timer1, *timer2;
56 void __iomem *interrupt_regs;
57
58 struct clk *clk;
59 struct clock_event_device clkevt;
60 struct irqaction clkevt_irq;
61
62 char clocksource_name[64];
63 char clockevent_name[64];
64};
65
66static int zevio_timer_set_event(unsigned long delta,
67 struct clock_event_device *dev)
68{
69 struct zevio_timer *timer = container_of(dev, struct zevio_timer,
70 clkevt);
71
72 writel(delta, timer->timer1 + IO_CURRENT_VAL);
73 writel(CNTL_RUN_TIMER | CNTL_DEC | CNTL_MATCH(TIMER_MATCH),
74 timer->timer1 + IO_CONTROL);
75
76 return 0;
77}
78
79static void zevio_timer_set_mode(enum clock_event_mode mode,
80 struct clock_event_device *dev)
81{
82 struct zevio_timer *timer = container_of(dev, struct zevio_timer,
83 clkevt);
84
85 switch (mode) {
86 case CLOCK_EVT_MODE_RESUME:
87 case CLOCK_EVT_MODE_ONESHOT:
88 /* Enable timer interrupts */
89 writel(TIMER_INTR_MSK, timer->interrupt_regs + IO_INTR_MSK);
90 writel(TIMER_INTR_ALL, timer->interrupt_regs + IO_INTR_ACK);
91 break;
92 case CLOCK_EVT_MODE_SHUTDOWN:
93 case CLOCK_EVT_MODE_UNUSED:
94 /* Disable timer interrupts */
95 writel(0, timer->interrupt_regs + IO_INTR_MSK);
96 writel(TIMER_INTR_ALL, timer->interrupt_regs + IO_INTR_ACK);
97 /* Stop timer */
98 writel(CNTL_STOP_TIMER, timer->timer1 + IO_CONTROL);
99 break;
100 case CLOCK_EVT_MODE_PERIODIC:
101 default:
102 /* Unsupported */
103 break;
104 }
105}
106
107static irqreturn_t zevio_timer_interrupt(int irq, void *dev_id)
108{
109 struct zevio_timer *timer = dev_id;
110 u32 intr;
111
112 intr = readl(timer->interrupt_regs + IO_INTR_ACK);
113 if (!(intr & TIMER_INTR_MSK))
114 return IRQ_NONE;
115
116 writel(TIMER_INTR_MSK, timer->interrupt_regs + IO_INTR_ACK);
117 writel(CNTL_STOP_TIMER, timer->timer1 + IO_CONTROL);
118
119 if (timer->clkevt.event_handler)
120 timer->clkevt.event_handler(&timer->clkevt);
121
122 return IRQ_HANDLED;
123}
124
125static int __init zevio_timer_add(struct device_node *node)
126{
127 struct zevio_timer *timer;
128 struct resource res;
129 int irqnr, ret;
130
131 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
132 if (!timer)
133 return -ENOMEM;
134
135 timer->base = of_iomap(node, 0);
136 if (!timer->base) {
137 ret = -EINVAL;
138 goto error_free;
139 }
140 timer->timer1 = timer->base + IO_TIMER1;
141 timer->timer2 = timer->base + IO_TIMER2;
142
143 timer->clk = of_clk_get(node, 0);
144 if (IS_ERR(timer->clk)) {
145 ret = PTR_ERR(timer->clk);
146 pr_err("Timer clock not found! (error %d)\n", ret);