Commit | Line | Data |
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dd15ab81 | 1 | /* |
3e4ea372 AH |
2 | * |
3 | * Copyright (C) 2007 Google, Inc. | |
3f8e8cee | 4 | * Copyright (c) 2009-2012,2014, The Linux Foundation. All rights reserved. |
3e4ea372 AH |
5 | * |
6 | * This software is licensed under the terms of the GNU General Public | |
7 | * License version 2, as published by the Free Software Foundation, and | |
8 | * may be copied, distributed, and modified under those terms. | |
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 | */ | |
16 | ||
4a184075 SB |
17 | #include <linux/clocksource.h> |
18 | #include <linux/clockchips.h> | |
4d70c59b | 19 | #include <linux/cpu.h> |
3e4ea372 | 20 | #include <linux/init.h> |
3e4ea372 AH |
21 | #include <linux/interrupt.h> |
22 | #include <linux/irq.h> | |
fced80c7 | 23 | #include <linux/io.h> |
6e332163 SB |
24 | #include <linux/of.h> |
25 | #include <linux/of_address.h> | |
26 | #include <linux/of_irq.h> | |
38ff87f7 | 27 | #include <linux/sched_clock.h> |
3e4ea372 | 28 | |
013be5ad SB |
29 | #include <asm/delay.h> |
30 | ||
e25e3d1f SB |
31 | #define TIMER_MATCH_VAL 0x0000 |
32 | #define TIMER_COUNT_VAL 0x0004 | |
33 | #define TIMER_ENABLE 0x0008 | |
34 | #define TIMER_ENABLE_CLR_ON_MATCH_EN BIT(1) | |
35 | #define TIMER_ENABLE_EN BIT(0) | |
36 | #define TIMER_CLEAR 0x000C | |
37 | #define DGT_CLK_CTL 0x10 | |
38 | #define DGT_CLK_CTL_DIV_4 0x3 | |
39 | #define TIMER_STS_GPT0_CLR_PEND BIT(10) | |
3e4ea372 AH |
40 | |
41 | #define GPT_HZ 32768 | |
672039f0 | 42 | |
2a00c106 | 43 | static void __iomem *event_base; |
e25e3d1f | 44 | static void __iomem *sts_base; |
a850c3f6 | 45 | |
3e4ea372 AH |
46 | static irqreturn_t msm_timer_interrupt(int irq, void *dev_id) |
47 | { | |
4d70c59b | 48 | struct clock_event_device *evt = dev_id; |
a850c3f6 | 49 | /* Stop the timer tick */ |
736b2df2 | 50 | if (clockevent_state_oneshot(evt)) { |
2a00c106 | 51 | u32 ctrl = readl_relaxed(event_base + TIMER_ENABLE); |
a850c3f6 | 52 | ctrl &= ~TIMER_ENABLE_EN; |
2a00c106 | 53 | writel_relaxed(ctrl, event_base + TIMER_ENABLE); |
a850c3f6 | 54 | } |
3e4ea372 AH |
55 | evt->event_handler(evt); |
56 | return IRQ_HANDLED; | |
57 | } | |
58 | ||
3e4ea372 AH |
59 | static int msm_timer_set_next_event(unsigned long cycles, |
60 | struct clock_event_device *evt) | |
61 | { | |
2a00c106 | 62 | u32 ctrl = readl_relaxed(event_base + TIMER_ENABLE); |
3e4ea372 | 63 | |
4080d2d1 SB |
64 | ctrl &= ~TIMER_ENABLE_EN; |
65 | writel_relaxed(ctrl, event_base + TIMER_ENABLE); | |
66 | ||
67 | writel_relaxed(ctrl, event_base + TIMER_CLEAR); | |
2a00c106 | 68 | writel_relaxed(cycles, event_base + TIMER_MATCH_VAL); |
e25e3d1f SB |
69 | |
70 | if (sts_base) | |
71 | while (readl_relaxed(sts_base) & TIMER_STS_GPT0_CLR_PEND) | |
72 | cpu_relax(); | |
73 | ||
2a00c106 | 74 | writel_relaxed(ctrl | TIMER_ENABLE_EN, event_base + TIMER_ENABLE); |
3e4ea372 AH |
75 | return 0; |
76 | } | |
77 | ||
736b2df2 | 78 | static int msm_timer_shutdown(struct clock_event_device *evt) |
3e4ea372 | 79 | { |
a850c3f6 SB |
80 | u32 ctrl; |
81 | ||
2a00c106 | 82 | ctrl = readl_relaxed(event_base + TIMER_ENABLE); |
a850c3f6 | 83 | ctrl &= ~(TIMER_ENABLE_EN | TIMER_ENABLE_CLR_ON_MATCH_EN); |
2a00c106 | 84 | writel_relaxed(ctrl, event_base + TIMER_ENABLE); |
736b2df2 | 85 | return 0; |
3e4ea372 AH |
86 | } |
87 | ||
4d70c59b | 88 | static struct clock_event_device __percpu *msm_evt; |
2a00c106 SB |
89 | |
90 | static void __iomem *source_base; | |
91 | ||
f8e56c42 | 92 | static notrace cycle_t msm_read_timer_count(struct clocksource *cs) |
2081a6b5 SB |
93 | { |
94 | return readl_relaxed(source_base + TIMER_COUNT_VAL); | |
95 | } | |
96 | ||
2a00c106 SB |
97 | static struct clocksource msm_clocksource = { |
98 | .name = "dg_timer", | |
99 | .rating = 300, | |
100 | .read = msm_read_timer_count, | |
2081a6b5 | 101 | .mask = CLOCKSOURCE_MASK(32), |
2a00c106 | 102 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
3e4ea372 AH |
103 | }; |
104 | ||
4d70c59b SB |
105 | static int msm_timer_irq; |
106 | static int msm_timer_has_ppi; | |
107 | ||
8bd26e3a | 108 | static int msm_local_timer_setup(struct clock_event_device *evt) |
5ca709c1 | 109 | { |
4d70c59b SB |
110 | int cpu = smp_processor_id(); |
111 | int err; | |
112 | ||
113 | evt->irq = msm_timer_irq; | |
114 | evt->name = "msm_timer"; | |
115 | evt->features = CLOCK_EVT_FEAT_ONESHOT; | |
116 | evt->rating = 200; | |
736b2df2 VK |
117 | evt->set_state_shutdown = msm_timer_shutdown; |
118 | evt->set_state_oneshot = msm_timer_shutdown; | |
119 | evt->tick_resume = msm_timer_shutdown; | |
5ca709c1 | 120 | evt->set_next_event = msm_timer_set_next_event; |
4d70c59b SB |
121 | evt->cpumask = cpumask_of(cpu); |
122 | ||
123 | clockevents_config_and_register(evt, GPT_HZ, 4, 0xffffffff); | |
124 | ||
125 | if (msm_timer_has_ppi) { | |
126 | enable_percpu_irq(evt->irq, IRQ_TYPE_EDGE_RISING); | |
127 | } else { | |
128 | err = request_irq(evt->irq, msm_timer_interrupt, | |
129 | IRQF_TIMER | IRQF_NOBALANCING | | |
130 | IRQF_TRIGGER_RISING, "gp_timer", evt); | |
131 | if (err) | |
132 | pr_err("request_irq failed\n"); | |
133 | } | |
5ca709c1 | 134 | |
5ca709c1 MZ |
135 | return 0; |
136 | } | |
137 | ||
138 | static void msm_local_timer_stop(struct clock_event_device *evt) | |
139 | { | |
736b2df2 | 140 | evt->set_state_shutdown(evt); |
5ca709c1 MZ |
141 | disable_percpu_irq(evt->irq); |
142 | } | |
143 | ||
47dcd356 | 144 | static int msm_timer_cpu_notify(struct notifier_block *self, |
4d70c59b SB |
145 | unsigned long action, void *hcpu) |
146 | { | |
147 | /* | |
148 | * Grab cpu pointer in each case to avoid spurious | |
149 | * preemptible warnings | |
150 | */ | |
151 | switch (action & ~CPU_TASKS_FROZEN) { | |
152 | case CPU_STARTING: | |
153 | msm_local_timer_setup(this_cpu_ptr(msm_evt)); | |
154 | break; | |
155 | case CPU_DYING: | |
156 | msm_local_timer_stop(this_cpu_ptr(msm_evt)); | |
157 | break; | |
158 | } | |
159 | ||
160 | return NOTIFY_OK; | |
161 | } | |
162 | ||
47dcd356 | 163 | static struct notifier_block msm_timer_cpu_nb = { |
4d70c59b | 164 | .notifier_call = msm_timer_cpu_notify, |
5ca709c1 | 165 | }; |
5ca709c1 | 166 | |
6aa16a26 | 167 | static u64 notrace msm_sched_clock_read(void) |
f8e56c42 SB |
168 | { |
169 | return msm_clocksource.read(&msm_clocksource); | |
170 | } | |
171 | ||
013be5ad SB |
172 | static unsigned long msm_read_current_timer(void) |
173 | { | |
174 | return msm_clocksource.read(&msm_clocksource); | |
175 | } | |
176 | ||
177 | static struct delay_timer msm_delay_timer = { | |
178 | .read_current_timer = msm_read_current_timer, | |
179 | }; | |
180 | ||
4312a7ef SB |
181 | static void __init msm_timer_init(u32 dgt_hz, int sched_bits, int irq, |
182 | bool percpu) | |
3e4ea372 | 183 | { |
2a00c106 | 184 | struct clocksource *cs = &msm_clocksource; |
4d70c59b SB |
185 | int res = 0; |
186 | ||
187 | msm_timer_irq = irq; | |
188 | msm_timer_has_ppi = percpu; | |
189 | ||
190 | msm_evt = alloc_percpu(struct clock_event_device); | |
191 | if (!msm_evt) { | |
192 | pr_err("memory allocation failed for clockevents\n"); | |
193 | goto err; | |
194 | } | |
3e4ea372 | 195 | |
4d70c59b SB |
196 | if (percpu) |
197 | res = request_percpu_irq(irq, msm_timer_interrupt, | |
198 | "gp_timer", msm_evt); | |
dd15ab81 | 199 | |
4d70c59b SB |
200 | if (res) { |
201 | pr_err("request_percpu_irq failed\n"); | |
202 | } else { | |
203 | res = register_cpu_notifier(&msm_timer_cpu_nb); | |
204 | if (res) { | |
205 | free_percpu_irq(irq, msm_evt); | |
dd15ab81 | 206 | goto err; |
28af690a | 207 | } |
4d70c59b SB |
208 | |
209 | /* Immediately configure the timer on the boot CPU */ | |
77422a8f | 210 | msm_local_timer_setup(raw_cpu_ptr(msm_evt)); |
3e4ea372 | 211 | } |
dd15ab81 | 212 | |
dd15ab81 | 213 | err: |
2a00c106 | 214 | writel_relaxed(TIMER_ENABLE_EN, source_base + TIMER_ENABLE); |
2081a6b5 | 215 | res = clocksource_register_hz(cs, dgt_hz); |
dd15ab81 | 216 | if (res) |
2a00c106 | 217 | pr_err("clocksource_register failed\n"); |
6aa16a26 | 218 | sched_clock_register(msm_sched_clock_read, sched_bits, dgt_hz); |
013be5ad SB |
219 | msm_delay_timer.freq = dgt_hz; |
220 | register_current_timer_delay(&msm_delay_timer); | |
3e4ea372 AH |
221 | } |
222 | ||
c602520f | 223 | static void __init msm_dt_timer_init(struct device_node *np) |
6e332163 | 224 | { |
6e332163 SB |
225 | u32 freq; |
226 | int irq; | |
227 | struct resource res; | |
228 | u32 percpu_offset; | |
eebdb0c1 SB |
229 | void __iomem *base; |
230 | void __iomem *cpu0_base; | |
6e332163 | 231 | |
eebdb0c1 SB |
232 | base = of_iomap(np, 0); |
233 | if (!base) { | |
6e332163 SB |
234 | pr_err("Failed to map event base\n"); |
235 | return; | |
236 | } | |
237 | ||
eebdb0c1 SB |
238 | /* We use GPT0 for the clockevent */ |
239 | irq = irq_of_parse_and_map(np, 1); | |
6e332163 SB |
240 | if (irq <= 0) { |
241 | pr_err("Can't get irq\n"); | |
242 | return; | |
243 | } | |
6e332163 | 244 | |
eebdb0c1 | 245 | /* We use CPU0's DGT for the clocksource */ |
6e332163 SB |
246 | if (of_property_read_u32(np, "cpu-offset", &percpu_offset)) |
247 | percpu_offset = 0; | |
248 | ||
249 | if (of_address_to_resource(np, 0, &res)) { | |
250 | pr_err("Failed to parse DGT resource\n"); | |
251 | return; | |
252 | } | |
253 | ||
eebdb0c1 SB |
254 | cpu0_base = ioremap(res.start + percpu_offset, resource_size(&res)); |
255 | if (!cpu0_base) { | |
6e332163 SB |
256 | pr_err("Failed to map source base\n"); |
257 | return; | |
258 | } | |
259 | ||
6e332163 SB |
260 | if (of_property_read_u32(np, "clock-frequency", &freq)) { |
261 | pr_err("Unknown frequency\n"); | |
262 | return; | |
263 | } | |
6e332163 | 264 | |
eebdb0c1 | 265 | event_base = base + 0x4; |
e25e3d1f | 266 | sts_base = base + 0x88; |
eebdb0c1 SB |
267 | source_base = cpu0_base + 0x24; |
268 | freq /= 4; | |
269 | writel_relaxed(DGT_CLK_CTL_DIV_4, source_base + DGT_CLK_CTL); | |
270 | ||
6e332163 SB |
271 | msm_timer_init(freq, 32, irq, !!percpu_offset); |
272 | } | |
c602520f SB |
273 | CLOCKSOURCE_OF_DECLARE(kpss_timer, "qcom,kpss-timer", msm_dt_timer_init); |
274 | CLOCKSOURCE_OF_DECLARE(scss_timer, "qcom,scss-timer", msm_dt_timer_init); |