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af75655c | 1 | /* |
cfda5901 | 2 | * Copyright (C) 2012 Altera Corporation |
af75655c JI |
3 | * Copyright (c) 2011 Picochip Ltd., Jamie Iles |
4 | * | |
cfda5901 DN |
5 | * Modified from mach-picoxcell/time.c |
6 | * | |
af75655c JI |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
cfda5901 DN |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
af75655c JI |
18 | */ |
19 | #include <linux/dw_apb_timer.h> | |
20 | #include <linux/of.h> | |
21 | #include <linux/of_address.h> | |
22 | #include <linux/of_irq.h> | |
af75655c JI |
23 | |
24 | #include <asm/mach/time.h> | |
25 | #include <asm/sched_clock.h> | |
26 | ||
af75655c JI |
27 | static void timer_get_base_and_rate(struct device_node *np, |
28 | void __iomem **base, u32 *rate) | |
29 | { | |
30 | *base = of_iomap(np, 0); | |
31 | ||
32 | if (!*base) | |
33 | panic("Unable to map regs for %s", np->name); | |
34 | ||
cfda5901 DN |
35 | if (of_property_read_u32(np, "clock-freq", rate) && |
36 | of_property_read_u32(np, "clock-frequency", rate)) | |
37 | panic("No clock-frequency property for %s", np->name); | |
af75655c JI |
38 | } |
39 | ||
cfda5901 | 40 | static void add_clockevent(struct device_node *event_timer) |
af75655c JI |
41 | { |
42 | void __iomem *iobase; | |
43 | struct dw_apb_clock_event_device *ced; | |
44 | u32 irq, rate; | |
45 | ||
46 | irq = irq_of_parse_and_map(event_timer, 0); | |
47 | if (irq == NO_IRQ) | |
48 | panic("No IRQ for clock event timer"); | |
49 | ||
50 | timer_get_base_and_rate(event_timer, &iobase, &rate); | |
51 | ||
52 | ced = dw_apb_clockevent_init(0, event_timer->name, 300, iobase, irq, | |
53 | rate); | |
54 | if (!ced) | |
55 | panic("Unable to initialise clockevent device"); | |
56 | ||
57 | dw_apb_clockevent_register(ced); | |
58 | } | |
59 | ||
cfda5901 | 60 | static void add_clocksource(struct device_node *source_timer) |
af75655c JI |
61 | { |
62 | void __iomem *iobase; | |
63 | struct dw_apb_clocksource *cs; | |
64 | u32 rate; | |
65 | ||
66 | timer_get_base_and_rate(source_timer, &iobase, &rate); | |
67 | ||
68 | cs = dw_apb_clocksource_init(300, source_timer->name, iobase, rate); | |
69 | if (!cs) | |
70 | panic("Unable to initialise clocksource device"); | |
71 | ||
72 | dw_apb_clocksource_start(cs); | |
73 | dw_apb_clocksource_register(cs); | |
74 | } | |
75 | ||
af75655c JI |
76 | static void __iomem *sched_io_base; |
77 | ||
cfda5901 | 78 | static u32 read_sched_clock(void) |
af75655c | 79 | { |
2f0778af | 80 | return __raw_readl(sched_io_base); |
af75655c JI |
81 | } |
82 | ||
cfda5901 | 83 | static const struct of_device_id sptimer_ids[] __initconst = { |
af75655c | 84 | { .compatible = "picochip,pc3x2-rtc" }, |
cfda5901 | 85 | { .compatible = "snps,dw-apb-timer-sp" }, |
af75655c JI |
86 | { /* Sentinel */ }, |
87 | }; | |
88 | ||
cfda5901 | 89 | static void init_sched_clock(void) |
af75655c JI |
90 | { |
91 | struct device_node *sched_timer; | |
92 | u32 rate; | |
93 | ||
cfda5901 | 94 | sched_timer = of_find_matching_node(NULL, sptimer_ids); |
af75655c JI |
95 | if (!sched_timer) |
96 | panic("No RTC for sched clock to use"); | |
97 | ||
98 | timer_get_base_and_rate(sched_timer, &sched_io_base, &rate); | |
99 | of_node_put(sched_timer); | |
100 | ||
cfda5901 | 101 | setup_sched_clock(read_sched_clock, 32, rate); |
af75655c JI |
102 | } |
103 | ||
cfda5901 | 104 | static const struct of_device_id osctimer_ids[] __initconst = { |
af75655c | 105 | { .compatible = "picochip,pc3x2-timer" }, |
cfda5901 | 106 | { .compatible = "snps,dw-apb-timer-osc" }, |
af75655c JI |
107 | {}, |
108 | }; | |
109 | ||
cfda5901 | 110 | static void __init timer_init(void) |
af75655c JI |
111 | { |
112 | struct device_node *event_timer, *source_timer; | |
113 | ||
cfda5901 | 114 | event_timer = of_find_matching_node(NULL, osctimer_ids); |
af75655c JI |
115 | if (!event_timer) |
116 | panic("No timer for clockevent"); | |
cfda5901 | 117 | add_clockevent(event_timer); |
af75655c | 118 | |
cfda5901 | 119 | source_timer = of_find_matching_node(event_timer, osctimer_ids); |
af75655c JI |
120 | if (!source_timer) |
121 | panic("No timer for clocksource"); | |
cfda5901 | 122 | add_clocksource(source_timer); |
af75655c JI |
123 | |
124 | of_node_put(source_timer); | |
125 | ||
cfda5901 | 126 | init_sched_clock(); |
af75655c JI |
127 | } |
128 | ||
cfda5901 DN |
129 | struct sys_timer dw_apb_timer = { |
130 | .init = timer_init, | |
af75655c | 131 | }; |