137 lines
2.7 KiB
C
137 lines
2.7 KiB
C
/* linux/arch/arm/plat-s5p/clock.c
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*
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* Copyright 2009 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* S5P - Common clock support
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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/init.h>
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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/clk.h>
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#include <linux/sysdev.h>
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#include <linux/io.h>
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#include <asm/div64.h>
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#include <plat/clock.h>
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#include <plat/clock-clksrc.h>
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#include <plat/s5p-clock.h>
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/* fin_apll, fin_mpll and fin_epll are all the same clock, which we call
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* clk_ext_xtal_mux.
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*/
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struct clk clk_ext_xtal_mux = {
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.name = "ext_xtal",
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.id = -1,
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};
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/* 48MHz USB Phy clock output */
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struct clk clk_48m = {
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.name = "clk_48m",
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.id = -1,
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.rate = 48000000,
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};
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/* APLL clock output
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* No need .ctrlbit, this is always on
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*/
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struct clk clk_fout_apll = {
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.name = "fout_apll",
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.id = -1,
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};
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/* MPLL clock output
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* No need .ctrlbit, this is always on
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*/
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struct clk clk_fout_mpll = {
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.name = "fout_mpll",
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.id = -1,
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};
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/* EPLL clock output */
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struct clk clk_fout_epll = {
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.name = "fout_epll",
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.id = -1,
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.ctrlbit = (1 << 31),
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};
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/* ARM clock */
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struct clk clk_arm = {
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.name = "armclk",
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.id = -1,
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.rate = 0,
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.ctrlbit = 0,
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};
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/* Possible clock sources for APLL Mux */
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static struct clk *clk_src_apll_list[] = {
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[0] = &clk_fin_apll,
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[1] = &clk_fout_apll,
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};
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struct clksrc_sources clk_src_apll = {
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.sources = clk_src_apll_list,
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.nr_sources = ARRAY_SIZE(clk_src_apll_list),
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};
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/* Possible clock sources for MPLL Mux */
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static struct clk *clk_src_mpll_list[] = {
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[0] = &clk_fin_mpll,
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[1] = &clk_fout_mpll,
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};
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struct clksrc_sources clk_src_mpll = {
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.sources = clk_src_mpll_list,
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.nr_sources = ARRAY_SIZE(clk_src_mpll_list),
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};
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/* Possible clock sources for EPLL Mux */
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static struct clk *clk_src_epll_list[] = {
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[0] = &clk_fin_epll,
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[1] = &clk_fout_epll,
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};
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struct clksrc_sources clk_src_epll = {
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.sources = clk_src_epll_list,
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.nr_sources = ARRAY_SIZE(clk_src_epll_list),
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};
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int s5p_gatectrl(void __iomem *reg, struct clk *clk, int enable)
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{
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unsigned int ctrlbit = clk->ctrlbit;
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u32 con;
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con = __raw_readl(reg);
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con = enable ? (con | ctrlbit) : (con & ~ctrlbit);
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__raw_writel(con, reg);
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return 0;
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}
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static struct clk *s5p_clks[] __initdata = {
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&clk_ext_xtal_mux,
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&clk_48m,
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&clk_fout_apll,
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&clk_fout_mpll,
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&clk_fout_epll,
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&clk_arm,
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};
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void __init s5p_register_clocks(unsigned long xtal_freq)
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{
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int ret;
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clk_ext_xtal_mux.rate = xtal_freq;
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ret = s3c24xx_register_clocks(s5p_clks, ARRAY_SIZE(s5p_clks));
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if (ret > 0)
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printk(KERN_ERR "Failed to register s5p clocks\n");
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}
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