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18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/interrupt.h>
21#include <linux/clockchips.h>
22#include <linux/clk.h>
23
24#include <linux/io.h>
25#include <linux/irq.h>
26#include <linux/of.h>
27#include <linux/of_address.h>
28#include <linux/of_irq.h>
29#include <linux/sched_clock.h>
30#include <asm/mach/time.h>
31
32#include "addr-map.h"
33#include "regs-timers.h"
34#include "regs-apbc.h"
35#include "irqs.h"
36#include <linux/soc/mmp/cputype.h>
37
38#define TIMERS_VIRT_BASE TIMERS1_VIRT_BASE
39
40#define MAX_DELTA (0xfffffffe)
41#define MIN_DELTA (16)
42
43static void __iomem *mmp_timer_base = TIMERS_VIRT_BASE;
44
45
46
47
48static inline uint32_t timer_read(void)
49{
50 int delay = 100;
51
52 __raw_writel(1, mmp_timer_base + TMR_CVWR(1));
53
54 while (delay--)
55 cpu_relax();
56
57 return __raw_readl(mmp_timer_base + TMR_CVWR(1));
58}
59
60static u64 notrace mmp_read_sched_clock(void)
61{
62 return timer_read();
63}
64
65static irqreturn_t timer_interrupt(int irq, void *dev_id)
66{
67 struct clock_event_device *c = dev_id;
68
69
70
71
72 __raw_writel(0x01, mmp_timer_base + TMR_ICR(0));
73
74
75
76
77 __raw_writel(0x02, mmp_timer_base + TMR_CER);
78
79 c->event_handler(c);
80
81 return IRQ_HANDLED;
82}
83
84static int timer_set_next_event(unsigned long delta,
85 struct clock_event_device *dev)
86{
87 unsigned long flags;
88
89 local_irq_save(flags);
90
91
92
93
94 __raw_writel(0x02, mmp_timer_base + TMR_CER);
95
96
97
98
99 __raw_writel(0x01, mmp_timer_base + TMR_ICR(0));
100 __raw_writel(0x01, mmp_timer_base + TMR_IER(0));
101
102
103
104
105 __raw_writel(delta - 1, mmp_timer_base + TMR_TN_MM(0, 0));
106
107
108
109
110 __raw_writel(0x03, mmp_timer_base + TMR_CER);
111
112 local_irq_restore(flags);
113
114 return 0;
115}
116
117static int timer_set_shutdown(struct clock_event_device *evt)
118{
119 unsigned long flags;
120
121 local_irq_save(flags);
122
123 __raw_writel(0x00, mmp_timer_base + TMR_IER(0));
124 local_irq_restore(flags);
125
126 return 0;
127}
128
129static struct clock_event_device ckevt = {
130 .name = "clockevent",
131 .features = CLOCK_EVT_FEAT_ONESHOT,
132 .rating = 200,
133 .set_next_event = timer_set_next_event,
134 .set_state_shutdown = timer_set_shutdown,
135 .set_state_oneshot = timer_set_shutdown,
136};
137
138static u64 clksrc_read(struct clocksource *cs)
139{
140 return timer_read();
141}
142
143static struct clocksource cksrc = {
144 .name = "clocksource",
145 .rating = 200,
146 .read = clksrc_read,
147 .mask = CLOCKSOURCE_MASK(32),
148 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
149};
150
151static void __init timer_config(void)
152{
153 uint32_t ccr = __raw_readl(mmp_timer_base + TMR_CCR);
154
155 __raw_writel(0x0, mmp_timer_base + TMR_CER);
156
157 ccr &= (cpu_is_mmp2() || cpu_is_mmp3()) ?
158 (TMR_CCR_CS_0(0) | TMR_CCR_CS_1(0)) :
159 (TMR_CCR_CS_0(3) | TMR_CCR_CS_1(3));
160 __raw_writel(ccr, mmp_timer_base + TMR_CCR);
161
162
163 __raw_writel(0x2, mmp_timer_base + TMR_CMR);
164
165 __raw_writel(0x1, mmp_timer_base + TMR_PLCR(0));
166 __raw_writel(0x7, mmp_timer_base + TMR_ICR(0));
167 __raw_writel(0x0, mmp_timer_base + TMR_IER(0));
168
169 __raw_writel(0x0, mmp_timer_base + TMR_PLCR(1));
170 __raw_writel(0x7, mmp_timer_base + TMR_ICR(1));
171 __raw_writel(0x0, mmp_timer_base + TMR_IER(1));
172
173
174 __raw_writel(0x2, mmp_timer_base + TMR_CER);
175}
176
177void __init mmp_timer_init(int irq, unsigned long rate)
178{
179 timer_config();
180
181 sched_clock_register(mmp_read_sched_clock, 32, rate);
182
183 ckevt.cpumask = cpumask_of(0);
184
185 if (request_irq(irq, timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL,
186 "timer", &ckevt))
187 pr_err("Failed to request irq %d (timer)\n", irq);
188
189 clocksource_register_hz(&cksrc, rate);
190 clockevents_config_and_register(&ckevt, rate, MIN_DELTA, MAX_DELTA);
191}
192
193static int __init mmp_dt_init_timer(struct device_node *np)
194{
195 struct clk *clk;
196 int irq, ret;
197 unsigned long rate;
198
199 clk = of_clk_get(np, 0);
200 if (!IS_ERR(clk)) {
201 ret = clk_prepare_enable(clk);
202 if (ret)
203 return ret;
204 rate = clk_get_rate(clk);
205 } else if (cpu_is_pj4()) {
206 rate = 6500000;
207 } else {
208 rate = 3250000;
209 }
210
211 irq = irq_of_parse_and_map(np, 0);
212 if (!irq)
213 return -EINVAL;
214
215 mmp_timer_base = of_iomap(np, 0);
216 if (!mmp_timer_base)
217 return -ENOMEM;
218
219 mmp_timer_init(irq, rate);
220 return 0;
221}
222
223TIMER_OF_DECLARE(mmp_timer, "mrvl,mmp-timer", mmp_dt_init_timer);
224