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9c9b7818 UKK |
1 | /* |
2 | * Copyright (C) 2013 Pengutronix | |
3 | * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it under | |
6 | * the terms of the GNU General Public License version 2 as published by the | |
7 | * Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/clocksource.h> | |
14 | #include <linux/clockchips.h> | |
15 | #include <linux/irq.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/of.h> | |
18 | #include <linux/of_address.h> | |
19 | #include <linux/of_irq.h> | |
20 | #include <linux/clk.h> | |
21 | ||
22 | #define TIMERn_CTRL 0x00 | |
23 | #define TIMERn_CTRL_PRESC(val) (((val) & 0xf) << 24) | |
24 | #define TIMERn_CTRL_PRESC_1024 TIMERn_CTRL_PRESC(10) | |
25 | #define TIMERn_CTRL_CLKSEL(val) (((val) & 0x3) << 16) | |
26 | #define TIMERn_CTRL_CLKSEL_PRESCHFPERCLK TIMERn_CTRL_CLKSEL(0) | |
27 | #define TIMERn_CTRL_OSMEN 0x00000010 | |
28 | #define TIMERn_CTRL_MODE(val) (((val) & 0x3) << 0) | |
29 | #define TIMERn_CTRL_MODE_UP TIMERn_CTRL_MODE(0) | |
30 | #define TIMERn_CTRL_MODE_DOWN TIMERn_CTRL_MODE(1) | |
31 | ||
32 | #define TIMERn_CMD 0x04 | |
33 | #define TIMERn_CMD_START 0x00000001 | |
34 | #define TIMERn_CMD_STOP 0x00000002 | |
35 | ||
36 | #define TIMERn_IEN 0x0c | |
37 | #define TIMERn_IF 0x10 | |
38 | #define TIMERn_IFS 0x14 | |
39 | #define TIMERn_IFC 0x18 | |
40 | #define TIMERn_IRQ_UF 0x00000002 | |
41 | ||
42 | #define TIMERn_TOP 0x1c | |
43 | #define TIMERn_CNT 0x24 | |
44 | ||
45 | struct efm32_clock_event_ddata { | |
46 | struct clock_event_device evtdev; | |
47 | void __iomem *base; | |
48 | unsigned periodic_top; | |
49 | }; | |
50 | ||
51 | static void efm32_clock_event_set_mode(enum clock_event_mode mode, | |
52 | struct clock_event_device *evtdev) | |
53 | { | |
54 | struct efm32_clock_event_ddata *ddata = | |
55 | container_of(evtdev, struct efm32_clock_event_ddata, evtdev); | |
56 | ||
57 | switch (mode) { | |
58 | case CLOCK_EVT_MODE_PERIODIC: | |
59 | writel_relaxed(TIMERn_CMD_STOP, ddata->base + TIMERn_CMD); | |
60 | writel_relaxed(ddata->periodic_top, ddata->base + TIMERn_TOP); | |
61 | writel_relaxed(TIMERn_CTRL_PRESC_1024 | | |
62 | TIMERn_CTRL_CLKSEL_PRESCHFPERCLK | | |
63 | TIMERn_CTRL_MODE_DOWN, | |
64 | ddata->base + TIMERn_CTRL); | |
65 | writel_relaxed(TIMERn_CMD_START, ddata->base + TIMERn_CMD); | |
66 | break; | |
67 | ||
68 | case CLOCK_EVT_MODE_ONESHOT: | |
69 | writel_relaxed(TIMERn_CMD_STOP, ddata->base + TIMERn_CMD); | |
70 | writel_relaxed(TIMERn_CTRL_PRESC_1024 | | |
71 | TIMERn_CTRL_CLKSEL_PRESCHFPERCLK | | |
72 | TIMERn_CTRL_OSMEN | | |
73 | TIMERn_CTRL_MODE_DOWN, | |
74 | ddata->base + TIMERn_CTRL); | |
75 | break; | |
76 | ||
77 | case CLOCK_EVT_MODE_UNUSED: | |
78 | case CLOCK_EVT_MODE_SHUTDOWN: | |
79 | writel_relaxed(TIMERn_CMD_STOP, ddata->base + TIMERn_CMD); | |
80 | break; | |
81 | ||
82 | case CLOCK_EVT_MODE_RESUME: | |
83 | break; | |
84 | } | |
85 | } | |
86 | ||
87 | static int efm32_clock_event_set_next_event(unsigned long evt, | |
88 | struct clock_event_device *evtdev) | |
89 | { | |
90 | struct efm32_clock_event_ddata *ddata = | |
91 | container_of(evtdev, struct efm32_clock_event_ddata, evtdev); | |
92 | ||
93 | writel_relaxed(TIMERn_CMD_STOP, ddata->base + TIMERn_CMD); | |
94 | writel_relaxed(evt, ddata->base + TIMERn_CNT); | |
95 | writel_relaxed(TIMERn_CMD_START, ddata->base + TIMERn_CMD); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static irqreturn_t efm32_clock_event_handler(int irq, void *dev_id) | |
101 | { | |
102 | struct efm32_clock_event_ddata *ddata = dev_id; | |
103 | ||
104 | writel_relaxed(TIMERn_IRQ_UF, ddata->base + TIMERn_IFC); | |
105 | ||
106 | ddata->evtdev.event_handler(&ddata->evtdev); | |
107 | ||
108 | return IRQ_HANDLED; | |
109 | } | |
110 | ||
111 | static struct efm32_clock_event_ddata clock_event_ddata = { | |
112 | .evtdev = { | |
113 | .name = "efm32 clockevent", | |
ad834a34 | 114 | .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC, |
9c9b7818 UKK |
115 | .set_mode = efm32_clock_event_set_mode, |
116 | .set_next_event = efm32_clock_event_set_next_event, | |
117 | .rating = 200, | |
118 | }, | |
119 | }; | |
120 | ||
121 | static struct irqaction efm32_clock_event_irq = { | |
122 | .name = "efm32 clockevent", | |
123 | .flags = IRQF_TIMER, | |
124 | .handler = efm32_clock_event_handler, | |
125 | .dev_id = &clock_event_ddata, | |
126 | }; | |
127 | ||
128 | static int __init efm32_clocksource_init(struct device_node *np) | |
129 | { | |
130 | struct clk *clk; | |
131 | void __iomem *base; | |
132 | unsigned long rate; | |
133 | int ret; | |
134 | ||
135 | clk = of_clk_get(np, 0); | |
136 | if (IS_ERR(clk)) { | |
137 | ret = PTR_ERR(clk); | |
138 | pr_err("failed to get clock for clocksource (%d)\n", ret); | |
139 | goto err_clk_get; | |
140 | } | |
141 | ||
142 | ret = clk_prepare_enable(clk); | |
143 | if (ret) { | |
144 | pr_err("failed to enable timer clock for clocksource (%d)\n", | |
145 | ret); | |
146 | goto err_clk_enable; | |
147 | } | |
148 | rate = clk_get_rate(clk); | |
149 | ||
150 | base = of_iomap(np, 0); | |
151 | if (!base) { | |
152 | ret = -EADDRNOTAVAIL; | |
153 | pr_err("failed to map registers for clocksource\n"); | |
154 | goto err_iomap; | |
155 | } | |
156 | ||
157 | writel_relaxed(TIMERn_CTRL_PRESC_1024 | | |
158 | TIMERn_CTRL_CLKSEL_PRESCHFPERCLK | | |
159 | TIMERn_CTRL_MODE_UP, base + TIMERn_CTRL); | |
160 | writel_relaxed(TIMERn_CMD_START, base + TIMERn_CMD); | |
161 | ||
162 | ret = clocksource_mmio_init(base + TIMERn_CNT, "efm32 timer", | |
163 | DIV_ROUND_CLOSEST(rate, 1024), 200, 16, | |
164 | clocksource_mmio_readl_up); | |
165 | if (ret) { | |
166 | pr_err("failed to init clocksource (%d)\n", ret); | |
167 | goto err_clocksource_init; | |
168 | } | |
169 | ||
170 | return 0; | |
171 | ||
172 | err_clocksource_init: | |
173 | ||
174 | iounmap(base); | |
175 | err_iomap: | |
176 | ||
177 | clk_disable_unprepare(clk); | |
178 | err_clk_enable: | |
179 | ||
180 | clk_put(clk); | |
181 | err_clk_get: | |
182 | ||
183 | return ret; | |
184 | } | |
185 | ||
186 | static int __init efm32_clockevent_init(struct device_node *np) | |
187 | { | |
188 | struct clk *clk; | |
189 | void __iomem *base; | |
190 | unsigned long rate; | |
191 | int irq; | |
192 | int ret; | |
193 | ||
194 | clk = of_clk_get(np, 0); | |
195 | if (IS_ERR(clk)) { | |
196 | ret = PTR_ERR(clk); | |
197 | pr_err("failed to get clock for clockevent (%d)\n", ret); | |
198 | goto err_clk_get; | |
199 | } | |
200 | ||
201 | ret = clk_prepare_enable(clk); | |
202 | if (ret) { | |
203 | pr_err("failed to enable timer clock for clockevent (%d)\n", | |
204 | ret); | |
205 | goto err_clk_enable; | |
206 | } | |
207 | rate = clk_get_rate(clk); | |
208 | ||
209 | base = of_iomap(np, 0); | |
210 | if (!base) { | |
211 | ret = -EADDRNOTAVAIL; | |
212 | pr_err("failed to map registers for clockevent\n"); | |
213 | goto err_iomap; | |
214 | } | |
215 | ||
216 | irq = irq_of_parse_and_map(np, 0); | |
217 | if (!irq) { | |
218 | ret = -ENOENT; | |
219 | pr_err("failed to get irq for clockevent\n"); | |
220 | goto err_get_irq; | |
221 | } | |
222 | ||
223 | writel_relaxed(TIMERn_IRQ_UF, base + TIMERn_IEN); | |
224 | ||
225 | clock_event_ddata.base = base; | |
226 | clock_event_ddata.periodic_top = DIV_ROUND_CLOSEST(rate, 1024 * HZ); | |
227 | ||
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228 | clockevents_config_and_register(&clock_event_ddata.evtdev, |
229 | DIV_ROUND_CLOSEST(rate, 1024), | |
230 | 0xf, 0xffff); | |
231 | ||
7b8f10da YP |
232 | setup_irq(irq, &efm32_clock_event_irq); |
233 | ||
9c9b7818 UKK |
234 | return 0; |
235 | ||
236 | err_get_irq: | |
237 | ||
238 | iounmap(base); | |
239 | err_iomap: | |
240 | ||
241 | clk_disable_unprepare(clk); | |
242 | err_clk_enable: | |
243 | ||
244 | clk_put(clk); | |
245 | err_clk_get: | |
246 | ||
247 | return ret; | |
248 | } | |
249 | ||
250 | /* | |
251 | * This function asserts that we have exactly one clocksource and one | |
252 | * clock_event_device in the end. | |
253 | */ | |
254 | static void __init efm32_timer_init(struct device_node *np) | |
255 | { | |
256 | static int has_clocksource, has_clockevent; | |
257 | int ret; | |
258 | ||
259 | if (!has_clocksource) { | |
260 | ret = efm32_clocksource_init(np); | |
261 | if (!ret) { | |
262 | has_clocksource = 1; | |
263 | return; | |
264 | } | |
265 | } | |
266 | ||
267 | if (!has_clockevent) { | |
268 | ret = efm32_clockevent_init(np); | |
269 | if (!ret) { | |
270 | has_clockevent = 1; | |
271 | return; | |
272 | } | |
273 | } | |
274 | } | |
63cc1223 UKK |
275 | CLOCKSOURCE_OF_DECLARE(efm32compat, "efm32,timer", efm32_timer_init); |
276 | CLOCKSOURCE_OF_DECLARE(efm32, "energymicro,efm32-timer", efm32_timer_init); |