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1/*
2 * linux/drivers/clocksource/timer-sp.c
3 *
4 * Copyright (C) 1999 - 2003 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#include <linux/clk.h>
22#include <linux/clocksource.h>
23#include <linux/clockchips.h>
24#include <linux/err.h>
25#include <linux/interrupt.h>
26#include <linux/irq.h>
27#include <linux/io.h>
28#include <linux/of.h>
29#include <linux/of_address.h>
30#include <linux/of_clk.h>
31#include <linux/of_irq.h>
32#include <linux/sched_clock.h>
33
34#include <clocksource/timer-sp804.h>
35
36#include "timer-sp.h"
37
38static long __init sp804_get_clock_rate(struct clk *clk)
39{
40 long rate;
41 int err;
42
43 err = clk_prepare(clk);
44 if (err) {
45 pr_err("sp804: clock failed to prepare: %d\n", err);
46 clk_put(clk);
47 return err;
48 }
49
50 err = clk_enable(clk);
51 if (err) {
52 pr_err("sp804: clock failed to enable: %d\n", err);
53 clk_unprepare(clk);
54 clk_put(clk);
55 return err;
56 }
57
58 rate = clk_get_rate(clk);
59 if (rate < 0) {
60 pr_err("sp804: clock failed to get rate: %ld\n", rate);
61 clk_disable(clk);
62 clk_unprepare(clk);
63 clk_put(clk);
64 }
65
66 return rate;
67}
68
69static void __iomem *sched_clock_base;
70
71static u64 notrace sp804_read(void)
72{
73 return ~readl_relaxed(sched_clock_base + TIMER_VALUE);
74}
75
76void __init sp804_timer_disable(void __iomem *base)
77{
78 writel(0, base + TIMER_CTRL);
79}
80
81int __init __sp804_clocksource_and_sched_clock_init(void __iomem *base,
82 const char *name,
83 struct clk *clk,
84 int use_sched_clock)
85{
86 long rate;
87
88 if (!clk) {
89 clk = clk_get_sys("sp804", name);
90 if (IS_ERR(clk)) {
91 pr_err("sp804: clock not found: %d\n",
92 (int)PTR_ERR(clk));
93 return PTR_ERR(clk);
94 }
95 }
96
97 rate = sp804_get_clock_rate(clk);
98 if (rate < 0)
99 return -EINVAL;
100
101 /* setup timer 0 as free-running clocksource */
102 writel(0, base + TIMER_CTRL);
103 writel(0xffffffff, base + TIMER_LOAD);
104 writel(0xffffffff, base + TIMER_VALUE);
105 writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
106 base + TIMER_CTRL);
107
108 clocksource_mmio_init(base + TIMER_VALUE, name,
109 rate, 200, 32, clocksource_mmio_readl_down);
110
111 if (use_sched_clock) {
112 sched_clock_base = base;
113 sched_clock_register(sp804_read, 32, rate);
114 }
115
116 return 0;
117}
118
119
120static void __iomem *clkevt_base;
121static unsigned long clkevt_reload;
122
123/*
124 * IRQ handler for the timer
125 */
126static irqreturn_t sp804_timer_interrupt(int irq, void *dev_id)
127{
128 struct clock_event_device *evt = dev_id;
129
130 /* clear the interrupt */
131 writel(1, clkevt_base + TIMER_INTCLR);
132
133 evt->event_handler(evt);
134
135 return IRQ_HANDLED;
136}
137
138static inline void timer_shutdown(struct clock_event_device *evt)
139{
140 writel(0, clkevt_base + TIMER_CTRL);
141}
142
143static int sp804_shutdown(struct clock_event_device *evt)
144{
145 timer_shutdown(evt);
146 return 0;
147}
148
149static int sp804_set_periodic(struct clock_event_device *evt)
150{
151 unsigned long ctrl = TIMER_CTRL_32BIT | TIMER_CTRL_IE |
152 TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
153
154 timer_shutdown(evt);
155 writel(clkevt_reload, clkevt_base + TIMER_LOAD);
156 writel(ctrl, clkevt_base + TIMER_CTRL);
157 return 0;
158}
159
160static int sp804_set_next_event(unsigned long next,
161 struct clock_event_device *evt)
162{
163 unsigned long ctrl = TIMER_CTRL_32BIT | TIMER_CTRL_IE |
164 TIMER_CTRL_ONESHOT | TIMER_CTRL_ENABLE;
165
166 writel(next, clkevt_base + TIMER_LOAD);
167 writel(ctrl, clkevt_base + TIMER_CTRL);
168
169 return 0;
170}
171
172static struct clock_event_device sp804_clockevent = {
173 .features = CLOCK_EVT_FEAT_PERIODIC |
174 CLOCK_EVT_FEAT_ONESHOT |
175 CLOCK_EVT_FEAT_DYNIRQ,
176 .set_state_shutdown = sp804_shutdown,
177 .set_state_periodic = sp804_set_periodic,
178 .set_state_oneshot = sp804_shutdown,
179 .tick_resume = sp804_shutdown,
180 .set_next_event = sp804_set_next_event,
181 .rating = 300,
182};
183
184static struct irqaction sp804_timer_irq = {
185 .name = "timer",
186 .flags = IRQF_TIMER | IRQF_IRQPOLL,
187 .handler = sp804_timer_interrupt,
188 .dev_id = &sp804_clockevent,
189};
190
191int __init __sp804_clockevents_init(void __iomem *base, unsigned int irq, struct clk *clk, const char *name)
192{
193 struct clock_event_device *evt = &sp804_clockevent;
194 long rate;
195
196 if (!clk)
197 clk = clk_get_sys("sp804", name);
198 if (IS_ERR(clk)) {
199 pr_err("sp804: %s clock not found: %d\n", name,
200 (int)PTR_ERR(clk));
201 return PTR_ERR(clk);
202 }
203
204 rate = sp804_get_clock_rate(clk);
205 if (rate < 0)
206 return -EINVAL;
207
208 clkevt_base = base;
209 clkevt_reload = DIV_ROUND_CLOSEST(rate, HZ);
210 evt->name = name;
211 evt->irq = irq;
212 evt->cpumask = cpu_possible_mask;
213
214 writel(0, base + TIMER_CTRL);
215
216 setup_irq(irq, &sp804_timer_irq);
217 clockevents_config_and_register(evt, rate, 0xf, 0xffffffff);
218
219 return 0;
220}
221
222static int __init sp804_of_init(struct device_node *np)
223{
224 static bool initialized = false;
225 void __iomem *base;
226 int irq, ret = -EINVAL;
227 u32 irq_num = 0;
228 struct clk *clk1, *clk2;
229 const char *name = of_get_property(np, "compatible", NULL);
230
231 base = of_iomap(np, 0);
232 if (!base)
233 return -ENXIO;
234
235 /* Ensure timers are disabled */
236 writel(0, base + TIMER_CTRL);
237 writel(0, base + TIMER_2_BASE + TIMER_CTRL);
238
239 if (initialized || !of_device_is_available(np)) {
240 ret = -EINVAL;
241 goto err;
242 }
243
244 clk1 = of_clk_get(np, 0);
245 if (IS_ERR(clk1))
246 clk1 = NULL;
247
248 /* Get the 2nd clock if the timer has 3 timer clocks */
249 if (of_clk_get_parent_count(np) == 3) {
250 clk2 = of_clk_get(np, 1);
251 if (IS_ERR(clk2)) {
252 pr_err("sp804: %pOFn clock not found: %d\n", np,
253 (int)PTR_ERR(clk2));
254 clk2 = NULL;
255 }
256 } else
257 clk2 = clk1;
258
259 irq = irq_of_parse_and_map(np, 0);
260 if (irq <= 0)
261 goto err;
262
263 of_property_read_u32(np, "arm,sp804-has-irq", &irq_num);
264 if (irq_num == 2) {
265
266 ret = __sp804_clockevents_init(base + TIMER_2_BASE, irq, clk2, name);
267 if (ret)
268 goto err;
269
270 ret = __sp804_clocksource_and_sched_clock_init(base, name, clk1, 1);
271 if (ret)
272 goto err;
273 } else {
274
275 ret = __sp804_clockevents_init(base, irq, clk1 , name);
276 if (ret)
277 goto err;
278
279 ret =__sp804_clocksource_and_sched_clock_init(base + TIMER_2_BASE,
280 name, clk2, 1);
281 if (ret)
282 goto err;
283 }
284 initialized = true;
285
286 return 0;
287err:
288 iounmap(base);
289 return ret;
290}
291TIMER_OF_DECLARE(sp804, "arm,sp804", sp804_of_init);
292
293static int __init integrator_cp_of_init(struct device_node *np)
294{
295 static int init_count = 0;
296 void __iomem *base;
297 int irq, ret = -EINVAL;
298 const char *name = of_get_property(np, "compatible", NULL);
299 struct clk *clk;
300
301 base = of_iomap(np, 0);
302 if (!base) {
303 pr_err("Failed to iomap\n");
304 return -ENXIO;
305 }
306
307 clk = of_clk_get(np, 0);
308 if (IS_ERR(clk)) {
309 pr_err("Failed to get clock\n");
310 return PTR_ERR(clk);
311 }
312
313 /* Ensure timer is disabled */
314 writel(0, base + TIMER_CTRL);
315
316 if (init_count == 2 || !of_device_is_available(np))
317 goto err;
318
319 if (!init_count) {
320 ret = __sp804_clocksource_and_sched_clock_init(base, name, clk, 0);
321 if (ret)
322 goto err;
323 } else {
324 irq = irq_of_parse_and_map(np, 0);
325 if (irq <= 0)
326 goto err;
327
328 ret = __sp804_clockevents_init(base, irq, clk, name);
329 if (ret)
330 goto err;
331 }
332
333 init_count++;
334 return 0;
335err:
336 iounmap(base);
337 return ret;
338}
339TIMER_OF_DECLARE(intcp, "arm,integrator-cp-timer", integrator_cp_of_init);
340

Warning: That file was not part of the compilation database. It may have many parsing errors.