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https://github.com/torvalds/linux
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0c1945d336
This patch adds clock support for S5PV210. This patch adds the clock register definitions and the various system clocks in S5PV210. Clocks that are common to other S5P SoC'c are added in the common S5P clock support. Signed-off-by: Thomas Abraham <thomas.ab@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
150 lines
2.9 KiB
C
150 lines
2.9 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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static struct clk s5p_clk_27m = {
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.name = "clk_27m",
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.id = -1,
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.rate = 27000000,
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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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struct clk clk_vpll = {
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.name = "vpll",
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.id = -1,
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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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&s5p_clk_27m,
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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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&clk_vpll,
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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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