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067bc914 BW |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2017 Spreadtrum Communications Inc. | |
4 | */ | |
5 | ||
6 | #include <linux/init.h> | |
7 | #include <linux/interrupt.h> | |
8 | ||
9 | #include "timer-of.h" | |
10 | ||
11 | #define TIMER_NAME "sprd_timer" | |
12 | ||
13 | #define TIMER_LOAD_LO 0x0 | |
14 | #define TIMER_LOAD_HI 0x4 | |
15 | #define TIMER_VALUE_LO 0x8 | |
16 | #define TIMER_VALUE_HI 0xc | |
17 | ||
18 | #define TIMER_CTL 0x10 | |
19 | #define TIMER_CTL_PERIOD_MODE BIT(0) | |
20 | #define TIMER_CTL_ENABLE BIT(1) | |
21 | #define TIMER_CTL_64BIT_WIDTH BIT(16) | |
22 | ||
23 | #define TIMER_INT 0x14 | |
24 | #define TIMER_INT_EN BIT(0) | |
25 | #define TIMER_INT_RAW_STS BIT(1) | |
26 | #define TIMER_INT_MASK_STS BIT(2) | |
27 | #define TIMER_INT_CLR BIT(3) | |
28 | ||
29 | #define TIMER_VALUE_SHDW_LO 0x18 | |
30 | #define TIMER_VALUE_SHDW_HI 0x1c | |
31 | ||
32 | #define TIMER_VALUE_LO_MASK GENMASK(31, 0) | |
33 | ||
34 | static void sprd_timer_enable(void __iomem *base, u32 flag) | |
35 | { | |
36 | u32 val = readl_relaxed(base + TIMER_CTL); | |
37 | ||
38 | val |= TIMER_CTL_ENABLE; | |
39 | if (flag & TIMER_CTL_64BIT_WIDTH) | |
40 | val |= TIMER_CTL_64BIT_WIDTH; | |
41 | else | |
42 | val &= ~TIMER_CTL_64BIT_WIDTH; | |
43 | ||
44 | if (flag & TIMER_CTL_PERIOD_MODE) | |
45 | val |= TIMER_CTL_PERIOD_MODE; | |
46 | else | |
47 | val &= ~TIMER_CTL_PERIOD_MODE; | |
48 | ||
49 | writel_relaxed(val, base + TIMER_CTL); | |
50 | } | |
51 | ||
52 | static void sprd_timer_disable(void __iomem *base) | |
53 | { | |
54 | u32 val = readl_relaxed(base + TIMER_CTL); | |
55 | ||
56 | val &= ~TIMER_CTL_ENABLE; | |
57 | writel_relaxed(val, base + TIMER_CTL); | |
58 | } | |
59 | ||
60 | static void sprd_timer_update_counter(void __iomem *base, unsigned long cycles) | |
61 | { | |
62 | writel_relaxed(cycles & TIMER_VALUE_LO_MASK, base + TIMER_LOAD_LO); | |
63 | writel_relaxed(0, base + TIMER_LOAD_HI); | |
64 | } | |
65 | ||
66 | static void sprd_timer_enable_interrupt(void __iomem *base) | |
67 | { | |
68 | writel_relaxed(TIMER_INT_EN, base + TIMER_INT); | |
69 | } | |
70 | ||
71 | static void sprd_timer_clear_interrupt(void __iomem *base) | |
72 | { | |
73 | u32 val = readl_relaxed(base + TIMER_INT); | |
74 | ||
75 | val |= TIMER_INT_CLR; | |
76 | writel_relaxed(val, base + TIMER_INT); | |
77 | } | |
78 | ||
79 | static int sprd_timer_set_next_event(unsigned long cycles, | |
80 | struct clock_event_device *ce) | |
81 | { | |
82 | struct timer_of *to = to_timer_of(ce); | |
83 | ||
84 | sprd_timer_disable(timer_of_base(to)); | |
85 | sprd_timer_update_counter(timer_of_base(to), cycles); | |
86 | sprd_timer_enable(timer_of_base(to), 0); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static int sprd_timer_set_periodic(struct clock_event_device *ce) | |
92 | { | |
93 | struct timer_of *to = to_timer_of(ce); | |
94 | ||
95 | sprd_timer_disable(timer_of_base(to)); | |
96 | sprd_timer_update_counter(timer_of_base(to), timer_of_period(to)); | |
97 | sprd_timer_enable(timer_of_base(to), TIMER_CTL_PERIOD_MODE); | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | static int sprd_timer_shutdown(struct clock_event_device *ce) | |
103 | { | |
104 | struct timer_of *to = to_timer_of(ce); | |
105 | ||
106 | sprd_timer_disable(timer_of_base(to)); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static irqreturn_t sprd_timer_interrupt(int irq, void *dev_id) | |
111 | { | |
112 | struct clock_event_device *ce = (struct clock_event_device *)dev_id; | |
113 | struct timer_of *to = to_timer_of(ce); | |
114 | ||
115 | sprd_timer_clear_interrupt(timer_of_base(to)); | |
116 | ||
117 | if (clockevent_state_oneshot(ce)) | |
118 | sprd_timer_disable(timer_of_base(to)); | |
119 | ||
120 | ce->event_handler(ce); | |
121 | return IRQ_HANDLED; | |
122 | } | |
123 | ||
124 | static struct timer_of to = { | |
125 | .flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK, | |
126 | ||
127 | .clkevt = { | |
128 | .name = TIMER_NAME, | |
129 | .rating = 300, | |
130 | .features = CLOCK_EVT_FEAT_DYNIRQ | CLOCK_EVT_FEAT_PERIODIC | | |
131 | CLOCK_EVT_FEAT_ONESHOT, | |
132 | .set_state_shutdown = sprd_timer_shutdown, | |
133 | .set_state_periodic = sprd_timer_set_periodic, | |
134 | .set_next_event = sprd_timer_set_next_event, | |
135 | .cpumask = cpu_possible_mask, | |
136 | }, | |
137 | ||
138 | .of_irq = { | |
139 | .handler = sprd_timer_interrupt, | |
140 | .flags = IRQF_TIMER | IRQF_IRQPOLL, | |
141 | }, | |
142 | }; | |
143 | ||
144 | static int __init sprd_timer_init(struct device_node *np) | |
145 | { | |
146 | int ret; | |
147 | ||
148 | ret = timer_of_init(np, &to); | |
149 | if (ret) | |
150 | return ret; | |
151 | ||
152 | sprd_timer_enable_interrupt(timer_of_base(&to)); | |
153 | clockevents_config_and_register(&to.clkevt, timer_of_rate(&to), | |
154 | 1, UINT_MAX); | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
15695575 BW |
159 | static struct timer_of suspend_to = { |
160 | .flags = TIMER_OF_BASE | TIMER_OF_CLOCK, | |
161 | }; | |
162 | ||
163 | static u64 sprd_suspend_timer_read(struct clocksource *cs) | |
164 | { | |
165 | return ~(u64)readl_relaxed(timer_of_base(&suspend_to) + | |
166 | TIMER_VALUE_SHDW_LO) & cs->mask; | |
167 | } | |
168 | ||
169 | static int sprd_suspend_timer_enable(struct clocksource *cs) | |
170 | { | |
171 | sprd_timer_update_counter(timer_of_base(&suspend_to), | |
172 | TIMER_VALUE_LO_MASK); | |
173 | sprd_timer_enable(timer_of_base(&suspend_to), TIMER_CTL_PERIOD_MODE); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static void sprd_suspend_timer_disable(struct clocksource *cs) | |
179 | { | |
180 | sprd_timer_disable(timer_of_base(&suspend_to)); | |
181 | } | |
182 | ||
183 | static struct clocksource suspend_clocksource = { | |
184 | .name = "sprd_suspend_timer", | |
185 | .rating = 200, | |
186 | .read = sprd_suspend_timer_read, | |
187 | .enable = sprd_suspend_timer_enable, | |
188 | .disable = sprd_suspend_timer_disable, | |
189 | .mask = CLOCKSOURCE_MASK(32), | |
190 | .flags = CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_SUSPEND_NONSTOP, | |
191 | }; | |
192 | ||
193 | static int __init sprd_suspend_timer_init(struct device_node *np) | |
194 | { | |
195 | int ret; | |
196 | ||
197 | ret = timer_of_init(np, &suspend_to); | |
198 | if (ret) | |
199 | return ret; | |
200 | ||
201 | clocksource_register_hz(&suspend_clocksource, | |
202 | timer_of_rate(&suspend_to)); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
067bc914 | 207 | TIMER_OF_DECLARE(sc9860_timer, "sprd,sc9860-timer", sprd_timer_init); |
15695575 BW |
208 | TIMER_OF_DECLARE(sc9860_persistent_timer, "sprd,sc9860-suspend-timer", |
209 | sprd_suspend_timer_init); |