1
2
3
4
5
6
7
8
9#include <linux/io.h>
10#include <linux/export.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/types.h>
14#include <linux/clk.h>
15#include <linux/clkdev.h>
16#include <linux/err.h>
17#include <linux/list.h>
18
19#include <asm/time.h>
20#include <asm/irq.h>
21#include <asm/div64.h>
22
23#include <lantiq_soc.h>
24
25#include "clk.h"
26#include "prom.h"
27
28
29static struct clk cpu_clk_generic[4];
30
31void clkdev_add_static(unsigned long cpu, unsigned long fpi,
32 unsigned long io, unsigned long ppe)
33{
34 cpu_clk_generic[0].rate = cpu;
35 cpu_clk_generic[1].rate = fpi;
36 cpu_clk_generic[2].rate = io;
37 cpu_clk_generic[3].rate = ppe;
38}
39
40struct clk *clk_get_cpu(void)
41{
42 return &cpu_clk_generic[0];
43}
44
45struct clk *clk_get_fpi(void)
46{
47 return &cpu_clk_generic[1];
48}
49EXPORT_SYMBOL_GPL(clk_get_fpi);
50
51struct clk *clk_get_io(void)
52{
53 return &cpu_clk_generic[2];
54}
55
56struct clk *clk_get_ppe(void)
57{
58 return &cpu_clk_generic[3];
59}
60EXPORT_SYMBOL_GPL(clk_get_ppe);
61
62static inline int clk_good(struct clk *clk)
63{
64 return clk && !IS_ERR(clk);
65}
66
67unsigned long clk_get_rate(struct clk *clk)
68{
69 if (unlikely(!clk_good(clk)))
70 return 0;
71
72 if (clk->rate != 0)
73 return clk->rate;
74
75 if (clk->get_rate != NULL)
76 return clk->get_rate();
77
78 return 0;
79}
80EXPORT_SYMBOL(clk_get_rate);
81
82int clk_set_rate(struct clk *clk, unsigned long rate)
83{
84 if (unlikely(!clk_good(clk)))
85 return 0;
86 if (clk->rates && *clk->rates) {
87 unsigned long *r = clk->rates;
88
89 while (*r && (*r != rate))
90 r++;
91 if (!*r) {
92 pr_err("clk %s.%s: trying to set invalid rate %ld\n",
93 clk->cl.dev_id, clk->cl.con_id, rate);
94 return -1;
95 }
96 }
97 clk->rate = rate;
98 return 0;
99}
100EXPORT_SYMBOL(clk_set_rate);
101
102long clk_round_rate(struct clk *clk, unsigned long rate)
103{
104 if (unlikely(!clk_good(clk)))
105 return 0;
106 if (clk->rates && *clk->rates) {
107 unsigned long *r = clk->rates;
108
109 while (*r && (*r != rate))
110 r++;
111 if (!*r) {
112 return clk->rate;
113 }
114 }
115 return rate;
116}
117EXPORT_SYMBOL(clk_round_rate);
118
119int clk_enable(struct clk *clk)
120{
121 if (unlikely(!clk_good(clk)))
122 return -1;
123
124 if (clk->enable)
125 return clk->enable(clk);
126
127 return -1;
128}
129EXPORT_SYMBOL(clk_enable);
130
131void clk_disable(struct clk *clk)
132{
133 if (unlikely(!clk_good(clk)))
134 return;
135
136 if (clk->disable)
137 clk->disable(clk);
138}
139EXPORT_SYMBOL(clk_disable);
140
141int clk_activate(struct clk *clk)
142{
143 if (unlikely(!clk_good(clk)))
144 return -1;
145
146 if (clk->activate)
147 return clk->activate(clk);
148
149 return -1;
150}
151EXPORT_SYMBOL(clk_activate);
152
153void clk_deactivate(struct clk *clk)
154{
155 if (unlikely(!clk_good(clk)))
156 return;
157
158 if (clk->deactivate)
159 clk->deactivate(clk);
160}
161EXPORT_SYMBOL(clk_deactivate);
162
163static inline u32 get_counter_resolution(void)
164{
165 u32 res;
166
167 __asm__ __volatile__(
168 ".set push\n"
169 ".set mips32r2\n"
170 "rdhwr %0, $3\n"
171 ".set pop\n"
172 : "=&r" (res)
173 :
174 : "memory");
175
176 return res;
177}
178
179void __init plat_time_init(void)
180{
181 struct clk *clk;
182
183 ltq_soc_init();
184
185 clk = clk_get_cpu();
186 mips_hpt_frequency = clk_get_rate(clk) / get_counter_resolution();
187 write_c0_compare(read_c0_count());
188 pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
189 clk_put(clk);
190}
191
