u-boot/arch/arm/cpu/armv7/s5pc1xx/clock.c

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/*
* Copyright (C) 2009 Samsung Electronics
* Minkyu Kang <mk7.kang@samsung.com>
* Heungjun Kim <riverful.kim@samsung.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/clk.h>
#define CLK_M 0
#define CLK_D 1
#define CLK_P 2
#ifndef CONFIG_SYS_CLK_FREQ_C100
#define CONFIG_SYS_CLK_FREQ_C100 12000000
#endif
#ifndef CONFIG_SYS_CLK_FREQ_C110
#define CONFIG_SYS_CLK_FREQ_C110 24000000
#endif
/* s5pc110: return pll clock frequency */
static unsigned long s5pc100_get_pll_clk(int pllreg)
{
struct s5pc100_clock *clk =
(struct s5pc100_clock *)samsung_get_base_clock();
unsigned long r, m, p, s, mask, fout;
unsigned int freq;
switch (pllreg) {
case APLL:
r = readl(&clk->apll_con);
break;
case MPLL:
r = readl(&clk->mpll_con);
break;
case EPLL:
r = readl(&clk->epll_con);
break;
case HPLL:
r = readl(&clk->hpll_con);
break;
default:
printf("Unsupported PLL (%d)\n", pllreg);
return 0;
}
/*
* APLL_CON: MIDV [25:16]
* MPLL_CON: MIDV [23:16]
* EPLL_CON: MIDV [23:16]
* HPLL_CON: MIDV [23:16]
*/
if (pllreg == APLL)
mask = 0x3ff;
else
mask = 0x0ff;
m = (r >> 16) & mask;
/* PDIV [13:8] */
p = (r >> 8) & 0x3f;
/* SDIV [2:0] */
s = r & 0x7;
/* FOUT = MDIV * FIN / (PDIV * 2^SDIV) */
freq = CONFIG_SYS_CLK_FREQ_C100;
fout = m * (freq / (p * (1 << s)));
return fout;
}
/* s5pc100: return pll clock frequency */
static unsigned long s5pc110_get_pll_clk(int pllreg)
{
struct s5pc110_clock *clk =
(struct s5pc110_clock *)samsung_get_base_clock();
unsigned long r, m, p, s, mask, fout;
unsigned int freq;
switch (pllreg) {
case APLL:
r = readl(&clk->apll_con);
break;
case MPLL:
r = readl(&clk->mpll_con);
break;
case EPLL:
r = readl(&clk->epll_con);
break;
case VPLL:
r = readl(&clk->vpll_con);
break;
default:
printf("Unsupported PLL (%d)\n", pllreg);
return 0;
}
/*
* APLL_CON: MIDV [25:16]
* MPLL_CON: MIDV [25:16]
* EPLL_CON: MIDV [24:16]
* VPLL_CON: MIDV [24:16]
*/
if (pllreg == APLL || pllreg == MPLL)
mask = 0x3ff;
else
mask = 0x1ff;
m = (r >> 16) & mask;
/* PDIV [13:8] */
p = (r >> 8) & 0x3f;
/* SDIV [2:0] */
s = r & 0x7;
freq = CONFIG_SYS_CLK_FREQ_C110;
if (pllreg == APLL) {
if (s < 1)
s = 1;
/* FOUT = MDIV * FIN / (PDIV * 2^(SDIV - 1)) */
fout = m * (freq / (p * (1 << (s - 1))));
} else
/* FOUT = MDIV * FIN / (PDIV * 2^SDIV) */
fout = m * (freq / (p * (1 << s)));
return fout;
}
/* s5pc110: return ARM clock frequency */
static unsigned long s5pc110_get_arm_clk(void)
{
struct s5pc110_clock *clk =
(struct s5pc110_clock *)samsung_get_base_clock();
unsigned long div;
unsigned long dout_apll, armclk;
unsigned int apll_ratio;
div = readl(&clk->div0);
/* APLL_RATIO: [2:0] */
apll_ratio = div & 0x7;
dout_apll = get_pll_clk(APLL) / (apll_ratio + 1);
armclk = dout_apll;
return armclk;
}
/* s5pc100: return ARM clock frequency */
static unsigned long s5pc100_get_arm_clk(void)
{
struct s5pc100_clock *clk =
(struct s5pc100_clock *)samsung_get_base_clock();
unsigned long div;
unsigned long dout_apll, armclk;
unsigned int apll_ratio, arm_ratio;
div = readl(&clk->div0);
/* ARM_RATIO: [6:4] */
arm_ratio = (div >> 4) & 0x7;
/* APLL_RATIO: [0] */
apll_ratio = div & 0x1;
dout_apll = get_pll_clk(APLL) / (apll_ratio + 1);
armclk = dout_apll / (arm_ratio + 1);
return armclk;
}
/* s5pc100: return HCLKD0 frequency */
static unsigned long get_hclk(void)
{
struct s5pc100_clock *clk =
(struct s5pc100_clock *)samsung_get_base_clock();
unsigned long hclkd0;
uint div, d0_bus_ratio;
div = readl(&clk->div0);
/* D0_BUS_RATIO: [10:8] */
d0_bus_ratio = (div >> 8) & 0x7;
hclkd0 = get_arm_clk() / (d0_bus_ratio + 1);
return hclkd0;
}
/* s5pc100: return PCLKD1 frequency */
static unsigned long get_pclkd1(void)
{
struct s5pc100_clock *clk =
(struct s5pc100_clock *)samsung_get_base_clock();
unsigned long d1_bus, pclkd1;
uint div, d1_bus_ratio, pclkd1_ratio;
div = readl(&clk->div0);
/* D1_BUS_RATIO: [14:12] */
d1_bus_ratio = (div >> 12) & 0x7;
/* PCLKD1_RATIO: [18:16] */
pclkd1_ratio = (div >> 16) & 0x7;
/* ASYNC Mode */
d1_bus = get_pll_clk(MPLL) / (d1_bus_ratio + 1);
pclkd1 = d1_bus / (pclkd1_ratio + 1);
return pclkd1;
}
/* s5pc110: return HCLKs frequency */
static unsigned long get_hclk_sys(int dom)
{
struct s5pc110_clock *clk =
(struct s5pc110_clock *)samsung_get_base_clock();
unsigned long hclk;
unsigned int div;
unsigned int offset;
unsigned int hclk_sys_ratio;
if (dom == CLK_M)
return get_hclk();
div = readl(&clk->div0);
/*
* HCLK_MSYS_RATIO: [10:8]
* HCLK_DSYS_RATIO: [19:16]
* HCLK_PSYS_RATIO: [27:24]
*/
offset = 8 + (dom << 0x3);
hclk_sys_ratio = (div >> offset) & 0xf;
hclk = get_pll_clk(MPLL) / (hclk_sys_ratio + 1);
return hclk;
}
/* s5pc110: return PCLKs frequency */
static unsigned long get_pclk_sys(int dom)
{
struct s5pc110_clock *clk =
(struct s5pc110_clock *)samsung_get_base_clock();
unsigned long pclk;
unsigned int div;
unsigned int offset;
unsigned int pclk_sys_ratio;
div = readl(&clk->div0);
/*
* PCLK_MSYS_RATIO: [14:12]
* PCLK_DSYS_RATIO: [22:20]
* PCLK_PSYS_RATIO: [30:28]
*/
offset = 12 + (dom << 0x3);
pclk_sys_ratio = (div >> offset) & 0x7;
pclk = get_hclk_sys(dom) / (pclk_sys_ratio + 1);
return pclk;
}
/* s5pc110: return peripheral clock frequency */
static unsigned long s5pc110_get_pclk(void)
{
return get_pclk_sys(CLK_P);
}
/* s5pc100: return peripheral clock frequency */
static unsigned long s5pc100_get_pclk(void)
{
return get_pclkd1();
}
/* s5pc1xx: return uart clock frequency */
static unsigned long s5pc1xx_get_uart_clk(int dev_index)
{
if (cpu_is_s5pc110())
return s5pc110_get_pclk();
else
return s5pc100_get_pclk();
}
/* s5pc1xx: return pwm clock frequency */
static unsigned long s5pc1xx_get_pwm_clk(void)
{
if (cpu_is_s5pc110())
return s5pc110_get_pclk();
else
return s5pc100_get_pclk();
}
unsigned long get_pll_clk(int pllreg)
{
if (cpu_is_s5pc110())
return s5pc110_get_pll_clk(pllreg);
else
return s5pc100_get_pll_clk(pllreg);
}
unsigned long get_arm_clk(void)
{
if (cpu_is_s5pc110())
return s5pc110_get_arm_clk();
else
return s5pc100_get_arm_clk();
}
unsigned long get_pwm_clk(void)
{
return s5pc1xx_get_pwm_clk();
}
unsigned long get_uart_clk(int dev_index)
{
return s5pc1xx_get_uart_clk(dev_index);
}
void set_mmc_clk(int dev_index, unsigned int div)
{
/* Do NOTHING */
}