/* * linux/arch/arm/mach-versatile/clock.c * * Copyright (C) 2004 ARM Limited. * Written by Deep Blue Solutions Limited. * * 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/module.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/string.h> #include <linux/clk.h> #include <linux/mutex.h> #include <asm/semaphore.h> #include <asm/hardware/icst307.h> #include "clock.h" static LIST_HEAD(clocks); static DEFINE_MUTEX(clocks_mutex); struct clk *clk_get(struct device *dev, const char *id) { struct clk *p, *clk = ERR_PTR(-ENOENT); mutex_lock(&clocks_mutex); list_for_each_entry(p, &clocks, node) { if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) { clk = p; break; } } mutex_unlock(&clocks_mutex); return clk; } EXPORT_SYMBOL(clk_get); void clk_put(struct clk *clk) { module_put(clk->owner); } EXPORT_SYMBOL(clk_put); 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); long clk_round_rate(struct clk *clk, unsigned long rate) { return rate; } EXPORT_SYMBOL(clk_round_rate); int clk_set_rate(struct clk *clk, unsigned long rate) { int ret = -EIO; if (clk->setvco) { struct icst307_vco vco; vco = icst307_khz_to_vco(clk->params, rate / 1000); clk->rate = icst307_khz(clk->params, vco) * 1000; printk("Clock %s: setting VCO reg params: S=%d R=%d V=%d\n", clk->name, vco.s, vco.r, vco.v); clk->setvco(clk, vco); ret = 0; } return ret; } EXPORT_SYMBOL(clk_set_rate); /* * These are fixed clocks. */ static struct clk kmi_clk = { .name = "KMIREFCLK", .rate = 24000000, }; static struct clk uart_clk = { .name = "UARTCLK", .rate = 24000000, }; static struct clk mmci_clk = { .name = "MCLK", .rate = 33000000, }; int clk_register(struct clk *clk) { mutex_lock(&clocks_mutex); list_add(&clk->node, &clocks); mutex_unlock(&clocks_mutex); return 0; } EXPORT_SYMBOL(clk_register); void clk_unregister(struct clk *clk) { mutex_lock(&clocks_mutex); list_del(&clk->node); mutex_unlock(&clocks_mutex); } EXPORT_SYMBOL(clk_unregister); static int __init clk_init(void) { clk_register(&kmi_clk); clk_register(&uart_clk); clk_register(&mmci_clk); return 0; } arch_initcall(clk_init);