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135 lines
2.5 KiB
135 lines
2.5 KiB
/*
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* linux/arch/arm/mach-versatile/clock.c
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*
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* Copyright (C) 2004 ARM Limited.
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* Written by Deep Blue Solutions Limited.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <linux/clk.h>
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#include <linux/mutex.h>
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#include <asm/hardware/icst307.h>
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#include "clock.h"
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static LIST_HEAD(clocks);
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static DEFINE_MUTEX(clocks_mutex);
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struct clk *clk_get(struct device *dev, const char *id)
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{
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struct clk *p, *clk = ERR_PTR(-ENOENT);
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mutex_lock(&clocks_mutex);
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list_for_each_entry(p, &clocks, node) {
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if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
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clk = p;
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break;
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}
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}
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mutex_unlock(&clocks_mutex);
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return clk;
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}
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EXPORT_SYMBOL(clk_get);
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void clk_put(struct clk *clk)
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{
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module_put(clk->owner);
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}
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EXPORT_SYMBOL(clk_put);
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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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long clk_round_rate(struct clk *clk, unsigned long rate)
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{
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return rate;
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}
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EXPORT_SYMBOL(clk_round_rate);
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int clk_set_rate(struct clk *clk, unsigned long rate)
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{
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int ret = -EIO;
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if (clk->setvco) {
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struct icst307_vco vco;
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vco = icst307_khz_to_vco(clk->params, rate / 1000);
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clk->rate = icst307_khz(clk->params, vco) * 1000;
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printk("Clock %s: setting VCO reg params: S=%d R=%d V=%d\n",
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clk->name, vco.s, vco.r, vco.v);
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clk->setvco(clk, vco);
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ret = 0;
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}
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return ret;
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}
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EXPORT_SYMBOL(clk_set_rate);
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/*
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* These are fixed clocks.
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*/
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static struct clk kmi_clk = {
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.name = "KMIREFCLK",
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.rate = 24000000,
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};
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static struct clk uart_clk = {
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.name = "UARTCLK",
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.rate = 24000000,
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};
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static struct clk mmci_clk = {
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.name = "MCLK",
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.rate = 33000000,
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};
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int clk_register(struct clk *clk)
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{
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mutex_lock(&clocks_mutex);
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list_add(&clk->node, &clocks);
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mutex_unlock(&clocks_mutex);
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return 0;
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}
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EXPORT_SYMBOL(clk_register);
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void clk_unregister(struct clk *clk)
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{
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mutex_lock(&clocks_mutex);
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list_del(&clk->node);
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mutex_unlock(&clocks_mutex);
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}
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EXPORT_SYMBOL(clk_unregister);
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static int __init clk_init(void)
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{
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clk_register(&kmi_clk);
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clk_register(&uart_clk);
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clk_register(&mmci_clk);
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return 0;
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}
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arch_initcall(clk_init);
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