104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
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/*
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* Ralink RT3662/RT3883 clock API
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*
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* Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <asm/mach-ralink/common.h>
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#include <asm/mach-ralink/rt3883.h>
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#include <asm/mach-ralink/rt3883_regs.h>
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#include "common.h"
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struct clk {
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unsigned long rate;
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};
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static struct clk rt3883_cpu_clk;
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static struct clk rt3883_sys_clk;
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static struct clk rt3883_wdt_clk;
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static struct clk rt3883_uart_clk;
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void __init rt3883_clocks_init(void)
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{
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u32 syscfg0;
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u32 clksel;
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u32 ddr2;
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syscfg0 = rt3883_sysc_rr(RT3883_SYSC_REG_SYSCFG0);
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clksel = ((syscfg0 >> RT3883_SYSCFG0_CPUCLK_SHIFT) &
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RT3883_SYSCFG0_CPUCLK_MASK);
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ddr2 = syscfg0 & RT3883_SYSCFG0_DRAM_TYPE_DDR2;
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switch (clksel) {
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case RT3883_SYSCFG0_CPUCLK_250:
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rt3883_cpu_clk.rate = 250000000;
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rt3883_sys_clk.rate = (ddr2) ? 125000000 : 83000000;
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break;
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case RT3883_SYSCFG0_CPUCLK_384:
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rt3883_cpu_clk.rate = 384000000;
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rt3883_sys_clk.rate = (ddr2) ? 128000000 : 96000000;
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break;
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case RT3883_SYSCFG0_CPUCLK_480:
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rt3883_cpu_clk.rate = 480000000;
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rt3883_sys_clk.rate = (ddr2) ? 160000000 : 120000000;
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break;
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case RT3883_SYSCFG0_CPUCLK_500:
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rt3883_cpu_clk.rate = 500000000;
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rt3883_sys_clk.rate = (ddr2) ? 166000000 : 125000000;
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break;
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}
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rt3883_wdt_clk.rate = rt3883_sys_clk.rate;
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rt3883_uart_clk.rate = 40000000;
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}
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struct clk *clk_get(struct device *dev, const char *id)
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{
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if (!strcmp(id, "sys"))
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return &rt3883_sys_clk;
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if (!strcmp(id, "cpu"))
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return &rt3883_cpu_clk;
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if (!strcmp(id, "wdt"))
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return &rt3883_wdt_clk;
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if (!strcmp(id, "uart"))
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return &rt3883_uart_clk;
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return ERR_PTR(-ENOENT);
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}
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EXPORT_SYMBOL(clk_get);
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int clk_enable(struct clk *clk)
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{
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return 0;
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}
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EXPORT_SYMBOL(clk_enable);
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void clk_disable(struct clk *clk)
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{
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}
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EXPORT_SYMBOL(clk_disable);
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unsigned long clk_get_rate(struct clk *clk)
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{
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return clk->rate;
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}
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EXPORT_SYMBOL(clk_get_rate);
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void clk_put(struct clk *clk)
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{
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}
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EXPORT_SYMBOL(clk_put);
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