2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License version 2 as published
4 * by the Free Software Foundation.
6 * Copyright (C) 2010 Thomas Langer <thomas.langer@lantiq.com>
7 * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
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>
21 #include <asm/div64.h>
23 #include <lantiq_soc.h>
28 /* lantiq socs have 3 static clocks */
29 static struct clk cpu_clk_generic[3];
31 void clkdev_add_static(unsigned long cpu, unsigned long fpi, unsigned long io)
33 cpu_clk_generic[0].rate = cpu;
34 cpu_clk_generic[1].rate = fpi;
35 cpu_clk_generic[2].rate = io;
38 struct clk *clk_get_cpu(void)
40 return &cpu_clk_generic[0];
43 struct clk *clk_get_fpi(void)
45 return &cpu_clk_generic[1];
47 EXPORT_SYMBOL_GPL(clk_get_fpi);
49 struct clk *clk_get_io(void)
51 return &cpu_clk_generic[2];
54 static inline int clk_good(struct clk *clk)
56 return clk && !IS_ERR(clk);
59 unsigned long clk_get_rate(struct clk *clk)
61 if (unlikely(!clk_good(clk)))
67 if (clk->get_rate != NULL)
68 return clk->get_rate();
72 EXPORT_SYMBOL(clk_get_rate);
74 int clk_set_rate(struct clk *clk, unsigned long rate)
76 if (unlikely(!clk_good(clk)))
78 if (clk->rates && *clk->rates) {
79 unsigned long *r = clk->rates;
81 while (*r && (*r != rate))
84 pr_err("clk %s.%s: trying to set invalid rate %ld\n",
85 clk->cl.dev_id, clk->cl.con_id, rate);
92 EXPORT_SYMBOL(clk_set_rate);
94 int clk_enable(struct clk *clk)
96 if (unlikely(!clk_good(clk)))
100 return clk->enable(clk);
104 EXPORT_SYMBOL(clk_enable);
106 void clk_disable(struct clk *clk)
108 if (unlikely(!clk_good(clk)))
114 EXPORT_SYMBOL(clk_disable);
116 int clk_activate(struct clk *clk)
118 if (unlikely(!clk_good(clk)))
122 return clk->activate(clk);
126 EXPORT_SYMBOL(clk_activate);
128 void clk_deactivate(struct clk *clk)
130 if (unlikely(!clk_good(clk)))
134 clk->deactivate(clk);
136 EXPORT_SYMBOL(clk_deactivate);
138 struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
143 static inline u32 get_counter_resolution(void)
147 __asm__ __volatile__(
159 void __init plat_time_init(void)
166 mips_hpt_frequency = clk_get_rate(clk) / get_counter_resolution();
167 write_c0_compare(read_c0_count());
168 pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);