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linux-next/arch/arm/plat-samsung/s5p-clock.c
Tushar Behera bdd3cc26ba ARM: SAMSUNG: Update default rate for xusbxti clock
The rate of xusbxti clock is set in individual machine files.
The default value should be defined at the clock definition
and individual machine files should modify it if required.

Division by zero in kernel.
[<c0011849>] (unwind_backtrace+0x1/0x9c) from [<c022c663>] (Ldiv0+0x9/0x12)
[<c022c663>] (Ldiv0+0x9/0x12) from [<c001a3c3>] (s3c_setrate_clksrc+0x33/0x78)
[<c001a3c3>] (s3c_setrate_clksrc+0x33/0x78) from [<c0019e67>] (clk_set_rate+0x2f/0x78)

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2012-07-13 15:34:30 +09:00

295 lines
5.6 KiB
C

/*
* Copyright 2009 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* S5P - Common clock support
*
* 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/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/io.h>
#include <asm/div64.h>
#include <mach/regs-clock.h>
#include <plat/clock.h>
#include <plat/clock-clksrc.h>
#include <plat/s5p-clock.h>
/* fin_apll, fin_mpll and fin_epll are all the same clock, which we call
* clk_ext_xtal_mux.
*/
struct clk clk_ext_xtal_mux = {
.name = "ext_xtal",
.id = -1,
};
struct clk clk_xusbxti = {
.name = "xusbxti",
.id = -1,
.rate = 24000000,
};
struct clk s5p_clk_27m = {
.name = "clk_27m",
.id = -1,
.rate = 27000000,
};
/* 48MHz USB Phy clock output */
struct clk clk_48m = {
.name = "clk_48m",
.id = -1,
.rate = 48000000,
};
/* APLL clock output
* No need .ctrlbit, this is always on
*/
struct clk clk_fout_apll = {
.name = "fout_apll",
.id = -1,
};
/* BPLL clock output */
struct clk clk_fout_bpll = {
.name = "fout_bpll",
.id = -1,
};
struct clk clk_fout_bpll_div2 = {
.name = "fout_bpll_div2",
.id = -1,
};
/* CPLL clock output */
struct clk clk_fout_cpll = {
.name = "fout_cpll",
.id = -1,
};
/* MPLL clock output
* No need .ctrlbit, this is always on
*/
struct clk clk_fout_mpll = {
.name = "fout_mpll",
.id = -1,
};
struct clk clk_fout_mpll_div2 = {
.name = "fout_mpll_div2",
.id = -1,
};
/* EPLL clock output */
struct clk clk_fout_epll = {
.name = "fout_epll",
.id = -1,
.ctrlbit = (1 << 31),
};
/* DPLL clock output */
struct clk clk_fout_dpll = {
.name = "fout_dpll",
.id = -1,
.ctrlbit = (1 << 31),
};
/* VPLL clock output */
struct clk clk_fout_vpll = {
.name = "fout_vpll",
.id = -1,
.ctrlbit = (1 << 31),
};
/* Possible clock sources for APLL Mux */
static struct clk *clk_src_apll_list[] = {
[0] = &clk_fin_apll,
[1] = &clk_fout_apll,
};
struct clksrc_sources clk_src_apll = {
.sources = clk_src_apll_list,
.nr_sources = ARRAY_SIZE(clk_src_apll_list),
};
/* Possible clock sources for BPLL Mux */
static struct clk *clk_src_bpll_list[] = {
[0] = &clk_fin_bpll,
[1] = &clk_fout_bpll,
};
struct clksrc_sources clk_src_bpll = {
.sources = clk_src_bpll_list,
.nr_sources = ARRAY_SIZE(clk_src_bpll_list),
};
static struct clk *clk_src_bpll_fout_list[] = {
[0] = &clk_fout_bpll_div2,
[1] = &clk_fout_bpll,
};
struct clksrc_sources clk_src_bpll_fout = {
.sources = clk_src_bpll_fout_list,
.nr_sources = ARRAY_SIZE(clk_src_bpll_fout_list),
};
/* Possible clock sources for CPLL Mux */
static struct clk *clk_src_cpll_list[] = {
[0] = &clk_fin_cpll,
[1] = &clk_fout_cpll,
};
struct clksrc_sources clk_src_cpll = {
.sources = clk_src_cpll_list,
.nr_sources = ARRAY_SIZE(clk_src_cpll_list),
};
/* Possible clock sources for MPLL Mux */
static struct clk *clk_src_mpll_list[] = {
[0] = &clk_fin_mpll,
[1] = &clk_fout_mpll,
};
struct clksrc_sources clk_src_mpll = {
.sources = clk_src_mpll_list,
.nr_sources = ARRAY_SIZE(clk_src_mpll_list),
};
static struct clk *clk_src_mpll_fout_list[] = {
[0] = &clk_fout_mpll_div2,
[1] = &clk_fout_mpll,
};
struct clksrc_sources clk_src_mpll_fout = {
.sources = clk_src_mpll_fout_list,
.nr_sources = ARRAY_SIZE(clk_src_mpll_fout_list),
};
/* Possible clock sources for EPLL Mux */
static struct clk *clk_src_epll_list[] = {
[0] = &clk_fin_epll,
[1] = &clk_fout_epll,
};
struct clksrc_sources clk_src_epll = {
.sources = clk_src_epll_list,
.nr_sources = ARRAY_SIZE(clk_src_epll_list),
};
/* Possible clock sources for DPLL Mux */
static struct clk *clk_src_dpll_list[] = {
[0] = &clk_fin_dpll,
[1] = &clk_fout_dpll,
};
struct clksrc_sources clk_src_dpll = {
.sources = clk_src_dpll_list,
.nr_sources = ARRAY_SIZE(clk_src_dpll_list),
};
struct clk clk_vpll = {
.name = "vpll",
.id = -1,
};
int s5p_gatectrl(void __iomem *reg, struct clk *clk, int enable)
{
unsigned int ctrlbit = clk->ctrlbit;
u32 con;
con = __raw_readl(reg);
con = enable ? (con | ctrlbit) : (con & ~ctrlbit);
__raw_writel(con, reg);
return 0;
}
int s5p_epll_enable(struct clk *clk, int enable)
{
unsigned int ctrlbit = clk->ctrlbit;
unsigned int epll_con = __raw_readl(S5P_EPLL_CON) & ~ctrlbit;
if (enable)
__raw_writel(epll_con | ctrlbit, S5P_EPLL_CON);
else
__raw_writel(epll_con, S5P_EPLL_CON);
return 0;
}
unsigned long s5p_epll_get_rate(struct clk *clk)
{
return clk->rate;
}
int s5p_spdif_set_rate(struct clk *clk, unsigned long rate)
{
struct clk *pclk;
int ret;
pclk = clk_get_parent(clk);
if (IS_ERR(pclk))
return -EINVAL;
ret = pclk->ops->set_rate(pclk, rate);
clk_put(pclk);
return ret;
}
unsigned long s5p_spdif_get_rate(struct clk *clk)
{
struct clk *pclk;
int rate;
pclk = clk_get_parent(clk);
if (IS_ERR(pclk))
return -EINVAL;
rate = pclk->ops->get_rate(pclk);
clk_put(pclk);
return rate;
}
struct clk_ops s5p_sclk_spdif_ops = {
.set_rate = s5p_spdif_set_rate,
.get_rate = s5p_spdif_get_rate,
};
static struct clk *s5p_clks[] __initdata = {
&clk_ext_xtal_mux,
&clk_48m,
&s5p_clk_27m,
&clk_fout_apll,
&clk_fout_mpll,
&clk_fout_epll,
&clk_fout_dpll,
&clk_fout_vpll,
&clk_vpll,
&clk_xusbxti,
};
void __init s5p_register_clocks(unsigned long xtal_freq)
{
int ret;
clk_ext_xtal_mux.rate = xtal_freq;
ret = s3c24xx_register_clocks(s5p_clks, ARRAY_SIZE(s5p_clks));
if (ret > 0)
printk(KERN_ERR "Failed to register s5p clocks\n");
}