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15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/sched.h>
18#include <linux/interrupt.h>
19#include <linux/irq.h>
20#include <linux/profile.h>
21#include <linux/clocksource.h>
22#include <asm/io.h>
23#include <asm/traps.h>
24#include <asm/machdep.h>
25#include <asm/coldfire.h>
26#include <asm/mcfslt.h>
27#include <asm/mcfsim.h>
28
29
30
31#ifdef CONFIG_HIGHPROFILE
32
33
34
35
36#define PA(a) (MCFSLT_TIMER1 + (a))
37
38
39
40
41
42#define PROFILEHZ 1013
43
44irqreturn_t mcfslt_profile_tick(int irq, void *dummy)
45{
46
47 __raw_writel(MCFSLT_SSR_BE | MCFSLT_SSR_TE, PA(MCFSLT_SSR));
48 if (current->pid)
49 profile_tick(CPU_PROFILING);
50 return IRQ_HANDLED;
51}
52
53void mcfslt_profile_init(void)
54{
55 int ret;
56
57 printk(KERN_INFO "PROFILE: lodging TIMER 1 @ %dHz as profile timer\n",
58 PROFILEHZ);
59
60 ret = request_irq(MCF_IRQ_PROFILER, mcfslt_profile_tick, IRQF_TIMER,
61 "profile timer", NULL);
62 if (ret) {
63 pr_err("Failed to request irq %d (profile timer): %pe\n",
64 MCF_IRQ_PROFILER, ERR_PTR(ret));
65 }
66
67
68 __raw_writel(MCF_BUSCLK / PROFILEHZ - 1, PA(MCFSLT_STCNT));
69 __raw_writel(MCFSLT_SCR_RUN | MCFSLT_SCR_IEN | MCFSLT_SCR_TEN,
70 PA(MCFSLT_SCR));
71
72}
73
74#endif
75
76
77
78
79
80
81#define TA(a) (MCFSLT_TIMER0 + (a))
82
83static u32 mcfslt_cycles_per_jiffy;
84static u32 mcfslt_cnt;
85
86static irqreturn_t mcfslt_tick(int irq, void *dummy)
87{
88
89 __raw_writel(MCFSLT_SSR_BE | MCFSLT_SSR_TE, TA(MCFSLT_SSR));
90 mcfslt_cnt += mcfslt_cycles_per_jiffy;
91 legacy_timer_tick(1);
92 return IRQ_HANDLED;
93}
94
95static u64 mcfslt_read_clk(struct clocksource *cs)
96{
97 unsigned long flags;
98 u32 cycles, scnt;
99
100 local_irq_save(flags);
101 scnt = __raw_readl(TA(MCFSLT_SCNT));
102 cycles = mcfslt_cnt;
103 if (__raw_readl(TA(MCFSLT_SSR)) & MCFSLT_SSR_TE) {
104 cycles += mcfslt_cycles_per_jiffy;
105 scnt = __raw_readl(TA(MCFSLT_SCNT));
106 }
107 local_irq_restore(flags);
108
109
110 return cycles + ((mcfslt_cycles_per_jiffy - 1) - scnt);
111}
112
113static struct clocksource mcfslt_clk = {
114 .name = "slt",
115 .rating = 250,
116 .read = mcfslt_read_clk,
117 .mask = CLOCKSOURCE_MASK(32),
118 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
119};
120
121void hw_timer_init(void)
122{
123 int r;
124
125 mcfslt_cycles_per_jiffy = MCF_BUSCLK / HZ;
126
127
128
129
130
131
132 __raw_writel(mcfslt_cycles_per_jiffy - 1, TA(MCFSLT_STCNT));
133 __raw_writel(MCFSLT_SCR_RUN | MCFSLT_SCR_IEN | MCFSLT_SCR_TEN,
134 TA(MCFSLT_SCR));
135
136 mcfslt_cnt = mcfslt_cycles_per_jiffy;
137
138 r = request_irq(MCF_IRQ_TIMER, mcfslt_tick, IRQF_TIMER, "timer", NULL);
139 if (r) {
140 pr_err("Failed to request irq %d (timer): %pe\n", MCF_IRQ_TIMER,
141 ERR_PTR(r));
142 }
143
144 clocksource_register_hz(&mcfslt_clk, MCF_BUSCLK);
145
146#ifdef CONFIG_HIGHPROFILE
147 mcfslt_profile_init();
148#endif
149}
150