u-boot/arch/arm/cpu/armv7/exynos/clock.c
Rajeshwari Shinde 989feb8c52 EXYNOS: CLK: Add i2c clock
This adds i2c clock information for EXYNOS5.

Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
2012-07-31 08:01:32 +02:00

672 lines
14 KiB
C

/*
* Copyright (C) 2010 Samsung Electronics
* Minkyu Kang <mk7.kang@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>
/* exynos4: return pll clock frequency */
static unsigned long exynos4_get_pll_clk(int pllreg)
{
struct exynos4_clock *clk =
(struct exynos4_clock *)samsung_get_base_clock();
unsigned long r, m, p, s, k = 0, mask, fout;
unsigned int freq;
switch (pllreg) {
case APLL:
r = readl(&clk->apll_con0);
break;
case MPLL:
r = readl(&clk->mpll_con0);
break;
case EPLL:
r = readl(&clk->epll_con0);
k = readl(&clk->epll_con1);
break;
case VPLL:
r = readl(&clk->vpll_con0);
k = readl(&clk->vpll_con1);
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;
if (pllreg == EPLL) {
k = k & 0xffff;
/* FOUT = (MDIV + K / 65536) * FIN / (PDIV * 2^SDIV) */
fout = (m + k / 65536) * (freq / (p * (1 << s)));
} else if (pllreg == VPLL) {
k = k & 0xfff;
/* FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV) */
fout = (m + k / 1024) * (freq / (p * (1 << s)));
} else {
if (s < 1)
s = 1;
/* FOUT = MDIV * FIN / (PDIV * 2^(SDIV - 1)) */
fout = m * (freq / (p * (1 << (s - 1))));
}
return fout;
}
/* exynos5: return pll clock frequency */
static unsigned long exynos5_get_pll_clk(int pllreg)
{
struct exynos5_clock *clk =
(struct exynos5_clock *)samsung_get_base_clock();
unsigned long r, m, p, s, k = 0, mask, fout;
unsigned int freq;
switch (pllreg) {
case APLL:
r = readl(&clk->apll_con0);
break;
case MPLL:
r = readl(&clk->mpll_con0);
break;
case EPLL:
r = readl(&clk->epll_con0);
k = readl(&clk->epll_con1);
break;
case VPLL:
r = readl(&clk->vpll_con0);
k = readl(&clk->vpll_con1);
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;
if (pllreg == EPLL) {
k = k & 0xffff;
/* FOUT = (MDIV + K / 65536) * FIN / (PDIV * 2^SDIV) */
fout = (m + k / 65536) * (freq / (p * (1 << s)));
} else if (pllreg == VPLL) {
k = k & 0xfff;
/* FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV) */
fout = (m + k / 1024) * (freq / (p * (1 << s)));
} else {
if (s < 1)
s = 1;
/* FOUT = MDIV * FIN / (PDIV * 2^(SDIV - 1)) */
fout = m * (freq / (p * (1 << (s - 1))));
}
return fout;
}
/* exynos4: return ARM clock frequency */
static unsigned long exynos4_get_arm_clk(void)
{
struct exynos4_clock *clk =
(struct exynos4_clock *)samsung_get_base_clock();
unsigned long div;
unsigned long armclk;
unsigned int core_ratio;
unsigned int core2_ratio;
div = readl(&clk->div_cpu0);
/* CORE_RATIO: [2:0], CORE2_RATIO: [30:28] */
core_ratio = (div >> 0) & 0x7;
core2_ratio = (div >> 28) & 0x7;
armclk = get_pll_clk(APLL) / (core_ratio + 1);
armclk /= (core2_ratio + 1);
return armclk;
}
/* exynos5: return ARM clock frequency */
static unsigned long exynos5_get_arm_clk(void)
{
struct exynos5_clock *clk =
(struct exynos5_clock *)samsung_get_base_clock();
unsigned long div;
unsigned long armclk;
unsigned int arm_ratio;
unsigned int arm2_ratio;
div = readl(&clk->div_cpu0);
/* ARM_RATIO: [2:0], ARM2_RATIO: [30:28] */
arm_ratio = (div >> 0) & 0x7;
arm2_ratio = (div >> 28) & 0x7;
armclk = get_pll_clk(APLL) / (arm_ratio + 1);
armclk /= (arm2_ratio + 1);
return armclk;
}
/* exynos4: return pwm clock frequency */
static unsigned long exynos4_get_pwm_clk(void)
{
struct exynos4_clock *clk =
(struct exynos4_clock *)samsung_get_base_clock();
unsigned long pclk, sclk;
unsigned int sel;
unsigned int ratio;
if (s5p_get_cpu_rev() == 0) {
/*
* CLK_SRC_PERIL0
* PWM_SEL [27:24]
*/
sel = readl(&clk->src_peril0);
sel = (sel >> 24) & 0xf;
if (sel == 0x6)
sclk = get_pll_clk(MPLL);
else if (sel == 0x7)
sclk = get_pll_clk(EPLL);
else if (sel == 0x8)
sclk = get_pll_clk(VPLL);
else
return 0;
/*
* CLK_DIV_PERIL3
* PWM_RATIO [3:0]
*/
ratio = readl(&clk->div_peril3);
ratio = ratio & 0xf;
} else if (s5p_get_cpu_rev() == 1) {
sclk = get_pll_clk(MPLL);
ratio = 8;
} else
return 0;
pclk = sclk / (ratio + 1);
return pclk;
}
/* exynos5: return pwm clock frequency */
static unsigned long exynos5_get_pwm_clk(void)
{
struct exynos5_clock *clk =
(struct exynos5_clock *)samsung_get_base_clock();
unsigned long pclk, sclk;
unsigned int ratio;
/*
* CLK_DIV_PERIC3
* PWM_RATIO [3:0]
*/
ratio = readl(&clk->div_peric3);
ratio = ratio & 0xf;
sclk = get_pll_clk(MPLL);
pclk = sclk / (ratio + 1);
return pclk;
}
/* exynos4: return uart clock frequency */
static unsigned long exynos4_get_uart_clk(int dev_index)
{
struct exynos4_clock *clk =
(struct exynos4_clock *)samsung_get_base_clock();
unsigned long uclk, sclk;
unsigned int sel;
unsigned int ratio;
/*
* CLK_SRC_PERIL0
* UART0_SEL [3:0]
* UART1_SEL [7:4]
* UART2_SEL [8:11]
* UART3_SEL [12:15]
* UART4_SEL [16:19]
* UART5_SEL [23:20]
*/
sel = readl(&clk->src_peril0);
sel = (sel >> (dev_index << 2)) & 0xf;
if (sel == 0x6)
sclk = get_pll_clk(MPLL);
else if (sel == 0x7)
sclk = get_pll_clk(EPLL);
else if (sel == 0x8)
sclk = get_pll_clk(VPLL);
else
return 0;
/*
* CLK_DIV_PERIL0
* UART0_RATIO [3:0]
* UART1_RATIO [7:4]
* UART2_RATIO [8:11]
* UART3_RATIO [12:15]
* UART4_RATIO [16:19]
* UART5_RATIO [23:20]
*/
ratio = readl(&clk->div_peril0);
ratio = (ratio >> (dev_index << 2)) & 0xf;
uclk = sclk / (ratio + 1);
return uclk;
}
/* exynos5: return uart clock frequency */
static unsigned long exynos5_get_uart_clk(int dev_index)
{
struct exynos5_clock *clk =
(struct exynos5_clock *)samsung_get_base_clock();
unsigned long uclk, sclk;
unsigned int sel;
unsigned int ratio;
/*
* CLK_SRC_PERIC0
* UART0_SEL [3:0]
* UART1_SEL [7:4]
* UART2_SEL [8:11]
* UART3_SEL [12:15]
* UART4_SEL [16:19]
* UART5_SEL [23:20]
*/
sel = readl(&clk->src_peric0);
sel = (sel >> (dev_index << 2)) & 0xf;
if (sel == 0x6)
sclk = get_pll_clk(MPLL);
else if (sel == 0x7)
sclk = get_pll_clk(EPLL);
else if (sel == 0x8)
sclk = get_pll_clk(VPLL);
else
return 0;
/*
* CLK_DIV_PERIC0
* UART0_RATIO [3:0]
* UART1_RATIO [7:4]
* UART2_RATIO [8:11]
* UART3_RATIO [12:15]
* UART4_RATIO [16:19]
* UART5_RATIO [23:20]
*/
ratio = readl(&clk->div_peric0);
ratio = (ratio >> (dev_index << 2)) & 0xf;
uclk = sclk / (ratio + 1);
return uclk;
}
/* exynos4: set the mmc clock */
static void exynos4_set_mmc_clk(int dev_index, unsigned int div)
{
struct exynos4_clock *clk =
(struct exynos4_clock *)samsung_get_base_clock();
unsigned int addr;
unsigned int val;
/*
* CLK_DIV_FSYS1
* MMC0_PRE_RATIO [15:8], MMC1_PRE_RATIO [31:24]
* CLK_DIV_FSYS2
* MMC2_PRE_RATIO [15:8], MMC3_PRE_RATIO [31:24]
*/
if (dev_index < 2) {
addr = (unsigned int)&clk->div_fsys1;
} else {
addr = (unsigned int)&clk->div_fsys2;
dev_index -= 2;
}
val = readl(addr);
val &= ~(0xff << ((dev_index << 4) + 8));
val |= (div & 0xff) << ((dev_index << 4) + 8);
writel(val, addr);
}
/* exynos5: set the mmc clock */
static void exynos5_set_mmc_clk(int dev_index, unsigned int div)
{
struct exynos5_clock *clk =
(struct exynos5_clock *)samsung_get_base_clock();
unsigned int addr;
unsigned int val;
/*
* CLK_DIV_FSYS1
* MMC0_PRE_RATIO [15:8], MMC1_PRE_RATIO [31:24]
* CLK_DIV_FSYS2
* MMC2_PRE_RATIO [15:8], MMC3_PRE_RATIO [31:24]
*/
if (dev_index < 2) {
addr = (unsigned int)&clk->div_fsys1;
} else {
addr = (unsigned int)&clk->div_fsys2;
dev_index -= 2;
}
val = readl(addr);
val &= ~(0xff << ((dev_index << 4) + 8));
val |= (div & 0xff) << ((dev_index << 4) + 8);
writel(val, addr);
}
/* get_lcd_clk: return lcd clock frequency */
static unsigned long exynos4_get_lcd_clk(void)
{
struct exynos4_clock *clk =
(struct exynos4_clock *)samsung_get_base_clock();
unsigned long pclk, sclk;
unsigned int sel;
unsigned int ratio;
/*
* CLK_SRC_LCD0
* FIMD0_SEL [3:0]
*/
sel = readl(&clk->src_lcd0);
sel = sel & 0xf;
/*
* 0x6: SCLK_MPLL
* 0x7: SCLK_EPLL
* 0x8: SCLK_VPLL
*/
if (sel == 0x6)
sclk = get_pll_clk(MPLL);
else if (sel == 0x7)
sclk = get_pll_clk(EPLL);
else if (sel == 0x8)
sclk = get_pll_clk(VPLL);
else
return 0;
/*
* CLK_DIV_LCD0
* FIMD0_RATIO [3:0]
*/
ratio = readl(&clk->div_lcd0);
ratio = ratio & 0xf;
pclk = sclk / (ratio + 1);
return pclk;
}
void exynos4_set_lcd_clk(void)
{
struct exynos4_clock *clk =
(struct exynos4_clock *)samsung_get_base_clock();
unsigned int cfg = 0;
/*
* CLK_GATE_BLOCK
* CLK_CAM [0]
* CLK_TV [1]
* CLK_MFC [2]
* CLK_G3D [3]
* CLK_LCD0 [4]
* CLK_LCD1 [5]
* CLK_GPS [7]
*/
cfg = readl(&clk->gate_block);
cfg |= 1 << 4;
writel(cfg, &clk->gate_block);
/*
* CLK_SRC_LCD0
* FIMD0_SEL [3:0]
* MDNIE0_SEL [7:4]
* MDNIE_PWM0_SEL [8:11]
* MIPI0_SEL [12:15]
* set lcd0 src clock 0x6: SCLK_MPLL
*/
cfg = readl(&clk->src_lcd0);
cfg &= ~(0xf);
cfg |= 0x6;
writel(cfg, &clk->src_lcd0);
/*
* CLK_GATE_IP_LCD0
* CLK_FIMD0 [0]
* CLK_MIE0 [1]
* CLK_MDNIE0 [2]
* CLK_DSIM0 [3]
* CLK_SMMUFIMD0 [4]
* CLK_PPMULCD0 [5]
* Gating all clocks for FIMD0
*/
cfg = readl(&clk->gate_ip_lcd0);
cfg |= 1 << 0;
writel(cfg, &clk->gate_ip_lcd0);
/*
* CLK_DIV_LCD0
* FIMD0_RATIO [3:0]
* MDNIE0_RATIO [7:4]
* MDNIE_PWM0_RATIO [11:8]
* MDNIE_PWM_PRE_RATIO [15:12]
* MIPI0_RATIO [19:16]
* MIPI0_PRE_RATIO [23:20]
* set fimd ratio
*/
cfg &= ~(0xf);
cfg |= 0x1;
writel(cfg, &clk->div_lcd0);
}
void exynos4_set_mipi_clk(void)
{
struct exynos4_clock *clk =
(struct exynos4_clock *)samsung_get_base_clock();
unsigned int cfg = 0;
/*
* CLK_SRC_LCD0
* FIMD0_SEL [3:0]
* MDNIE0_SEL [7:4]
* MDNIE_PWM0_SEL [8:11]
* MIPI0_SEL [12:15]
* set mipi0 src clock 0x6: SCLK_MPLL
*/
cfg = readl(&clk->src_lcd0);
cfg &= ~(0xf << 12);
cfg |= (0x6 << 12);
writel(cfg, &clk->src_lcd0);
/*
* CLK_SRC_MASK_LCD0
* FIMD0_MASK [0]
* MDNIE0_MASK [4]
* MDNIE_PWM0_MASK [8]
* MIPI0_MASK [12]
* set src mask mipi0 0x1: Unmask
*/
cfg = readl(&clk->src_mask_lcd0);
cfg |= (0x1 << 12);
writel(cfg, &clk->src_mask_lcd0);
/*
* CLK_GATE_IP_LCD0
* CLK_FIMD0 [0]
* CLK_MIE0 [1]
* CLK_MDNIE0 [2]
* CLK_DSIM0 [3]
* CLK_SMMUFIMD0 [4]
* CLK_PPMULCD0 [5]
* Gating all clocks for MIPI0
*/
cfg = readl(&clk->gate_ip_lcd0);
cfg |= 1 << 3;
writel(cfg, &clk->gate_ip_lcd0);
/*
* CLK_DIV_LCD0
* FIMD0_RATIO [3:0]
* MDNIE0_RATIO [7:4]
* MDNIE_PWM0_RATIO [11:8]
* MDNIE_PWM_PRE_RATIO [15:12]
* MIPI0_RATIO [19:16]
* MIPI0_PRE_RATIO [23:20]
* set mipi ratio
*/
cfg &= ~(0xf << 16);
cfg |= (0x1 << 16);
writel(cfg, &clk->div_lcd0);
}
/*
* I2C
*
* exynos5: obtaining the I2C clock
*/
static unsigned long exynos5_get_i2c_clk(void)
{
struct exynos5_clock *clk =
(struct exynos5_clock *)samsung_get_base_clock();
unsigned long aclk_66, aclk_66_pre, sclk;
unsigned int ratio;
sclk = get_pll_clk(MPLL);
ratio = (readl(&clk->div_top1)) >> 24;
ratio &= 0x7;
aclk_66_pre = sclk / (ratio + 1);
ratio = readl(&clk->div_top0);
ratio &= 0x7;
aclk_66 = aclk_66_pre / (ratio + 1);
return aclk_66;
}
unsigned long get_pll_clk(int pllreg)
{
if (cpu_is_exynos5())
return exynos5_get_pll_clk(pllreg);
else
return exynos4_get_pll_clk(pllreg);
}
unsigned long get_arm_clk(void)
{
if (cpu_is_exynos5())
return exynos5_get_arm_clk();
else
return exynos4_get_arm_clk();
}
unsigned long get_i2c_clk(void)
{
if (cpu_is_exynos5()) {
return exynos5_get_i2c_clk();
} else {
debug("I2C clock is not set for this CPU\n");
return 0;
}
}
unsigned long get_pwm_clk(void)
{
if (cpu_is_exynos5())
return exynos5_get_pwm_clk();
else
return exynos4_get_pwm_clk();
}
unsigned long get_uart_clk(int dev_index)
{
if (cpu_is_exynos5())
return exynos5_get_uart_clk(dev_index);
else
return exynos4_get_uart_clk(dev_index);
}
void set_mmc_clk(int dev_index, unsigned int div)
{
if (cpu_is_exynos5())
exynos5_set_mmc_clk(dev_index, div);
else
exynos4_set_mmc_clk(dev_index, div);
}
unsigned long get_lcd_clk(void)
{
if (cpu_is_exynos4())
return exynos4_get_lcd_clk();
else
return 0;
}
void set_lcd_clk(void)
{
if (cpu_is_exynos4())
exynos4_set_lcd_clk();
}
void set_mipi_clk(void)
{
if (cpu_is_exynos4())
exynos4_set_mipi_clk();
}