2 * Ralink RT3662/RT3883 clock API
4 * Copyright (C) 2011-2012 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/rt3883.h>
19 #include <asm/mach-ralink/rt3883_regs.h>
26 static struct clk rt3883_cpu_clk;
27 static struct clk rt3883_sys_clk;
28 static struct clk rt3883_wdt_clk;
29 static struct clk rt3883_uart_clk;
31 void __init rt3883_clocks_init(void)
37 syscfg0 = rt3883_sysc_rr(RT3883_SYSC_REG_SYSCFG0);
38 clksel = ((syscfg0 >> RT3883_SYSCFG0_CPUCLK_SHIFT) &
39 RT3883_SYSCFG0_CPUCLK_MASK);
40 ddr2 = syscfg0 & RT3883_SYSCFG0_DRAM_TYPE_DDR2;
43 case RT3883_SYSCFG0_CPUCLK_250:
44 rt3883_cpu_clk.rate = 250000000;
45 rt3883_sys_clk.rate = (ddr2) ? 125000000 : 83000000;
47 case RT3883_SYSCFG0_CPUCLK_384:
48 rt3883_cpu_clk.rate = 384000000;
49 rt3883_sys_clk.rate = (ddr2) ? 128000000 : 96000000;
51 case RT3883_SYSCFG0_CPUCLK_480:
52 rt3883_cpu_clk.rate = 480000000;
53 rt3883_sys_clk.rate = (ddr2) ? 160000000 : 120000000;
55 case RT3883_SYSCFG0_CPUCLK_500:
56 rt3883_cpu_clk.rate = 500000000;
57 rt3883_sys_clk.rate = (ddr2) ? 166000000 : 125000000;
61 rt3883_wdt_clk.rate = rt3883_sys_clk.rate;
62 rt3883_uart_clk.rate = 40000000;
65 struct clk *clk_get(struct device *dev, const char *id)
67 if (!strcmp(id, "sys"))
68 return &rt3883_sys_clk;
70 if (!strcmp(id, "cpu"))
71 return &rt3883_cpu_clk;
73 if (!strcmp(id, "wdt"))
74 return &rt3883_wdt_clk;
76 if (!strcmp(id, "uart"))
77 return &rt3883_uart_clk;
79 return ERR_PTR(-ENOENT);
81 EXPORT_SYMBOL(clk_get);
83 int clk_enable(struct clk *clk)
87 EXPORT_SYMBOL(clk_enable);
89 void clk_disable(struct clk *clk)
92 EXPORT_SYMBOL(clk_disable);
94 unsigned long clk_get_rate(struct clk *clk)
98 EXPORT_SYMBOL(clk_get_rate);
100 void clk_put(struct clk *clk)
103 EXPORT_SYMBOL(clk_put);