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