u-boot/arch/arm/cpu/armv7/s5pc1xx/clock.c
Minkyu Kang f70409aff3 ARMV7: S5P: separate the peripheral clocks
Because of peripheral devices can select clock sources,
separate the peripheral clocks. (pwm, uart and so on)
It just return the pclk at s5pc1xx SoC,
but s5pc210 SoC must be calculated by own clock register setting.

Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
2010-08-30 14:44:16 +09:00

330 lines
7 KiB
C

/*
* 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
unsigned long (*get_uart_clk)(int dev_index);
unsigned long (*get_pwm_clk)(void);
unsigned long (*get_arm_clk)(void);
unsigned long (*get_pll_clk)(int);
/* 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();
}
void s5p_clock_init(void)
{
if (cpu_is_s5pc110()) {
get_pll_clk = s5pc110_get_pll_clk;
get_arm_clk = s5pc110_get_arm_clk;
} else {
get_pll_clk = s5pc100_get_pll_clk;
get_arm_clk = s5pc100_get_arm_clk;
}
get_uart_clk = s5pc1xx_get_uart_clk;
get_pwm_clk = s5pc1xx_get_pwm_clk;
}