2 * Ralink RT288X clock API
4 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/err.h>
15 #include <linux/clk.h>
17 #include <asm/mach-ralink/common.h>
18 #include <asm/mach-ralink/rt288x.h>
19 #include <asm/mach-ralink/rt288x_regs.h>
26 static struct clk rt288x_cpu_clk;
27 static struct clk rt288x_sys_clk;
28 static struct clk rt288x_wdt_clk;
29 static struct clk rt288x_uart_clk;
31 void __init rt288x_clocks_init(void)
35 t = rt288x_sysc_rr(SYSC_REG_SYSTEM_CONFIG);
36 t = ((t >> SYSTEM_CONFIG_CPUCLK_SHIFT) & SYSTEM_CONFIG_CPUCLK_MASK);
39 case SYSTEM_CONFIG_CPUCLK_250:
40 rt288x_cpu_clk.rate = 250000000;
42 case SYSTEM_CONFIG_CPUCLK_266:
43 rt288x_cpu_clk.rate = 266666667;
45 case SYSTEM_CONFIG_CPUCLK_280:
46 rt288x_cpu_clk.rate = 280000000;
48 case SYSTEM_CONFIG_CPUCLK_300:
49 rt288x_cpu_clk.rate = 300000000;
53 rt288x_sys_clk.rate = rt288x_cpu_clk.rate / 2;
54 rt288x_uart_clk.rate = rt288x_sys_clk.rate;
55 rt288x_wdt_clk.rate = rt288x_sys_clk.rate;
61 struct clk *clk_get(struct device *dev, const char *id)
63 if (!strcmp(id, "sys"))
64 return &rt288x_sys_clk;
66 if (!strcmp(id, "cpu"))
67 return &rt288x_cpu_clk;
69 if (!strcmp(id, "wdt"))
70 return &rt288x_wdt_clk;
72 if (!strcmp(id, "uart"))
73 return &rt288x_uart_clk;
75 return ERR_PTR(-ENOENT);
77 EXPORT_SYMBOL(clk_get);
79 int clk_enable(struct clk *clk)
83 EXPORT_SYMBOL(clk_enable);
85 void clk_disable(struct clk *clk)
88 EXPORT_SYMBOL(clk_disable);
90 unsigned long clk_get_rate(struct clk *clk)
94 EXPORT_SYMBOL(clk_get_rate);
96 void clk_put(struct clk *clk)
99 EXPORT_SYMBOL(clk_put);