diff options
Diffstat (limited to 'arch/arm/cpu/armv7/s5pc2xx/clock.c')
| -rw-r--r-- | arch/arm/cpu/armv7/s5pc2xx/clock.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/s5pc2xx/clock.c b/arch/arm/cpu/armv7/s5pc2xx/clock.c new file mode 100644 index 0000000000..450a630486 --- /dev/null +++ b/arch/arm/cpu/armv7/s5pc2xx/clock.c @@ -0,0 +1,220 @@ +/* + * 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> + +#ifndef CONFIG_SYS_CLK_FREQ_C210 +#define CONFIG_SYS_CLK_FREQ_C210 24000000 +#endif + +/* s5pc210: return pll clock frequency */ +static unsigned long s5pc210_get_pll_clk(int pllreg) +{ + struct s5pc210_clock *clk = + (struct s5pc210_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_C210; + + 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; +} + +/* s5pc210: return ARM clock frequency */ +static unsigned long s5pc210_get_arm_clk(void) +{ + struct s5pc210_clock *clk = + (struct s5pc210_clock *)samsung_get_base_clock(); + unsigned long div; + unsigned long dout_apll; + unsigned int apll_ratio; + + div = readl(&clk->div_cpu0); + + /* APLL_RATIO: [26:24] */ + apll_ratio = (div >> 24) & 0x7; + + dout_apll = get_pll_clk(APLL) / (apll_ratio + 1); + + return dout_apll; +} + +/* s5pc210: return pwm clock frequency */ +static unsigned long s5pc210_get_pwm_clk(void) +{ + struct s5pc210_clock *clk = + (struct s5pc210_clock *)samsung_get_base_clock(); + unsigned long pclk, sclk; + unsigned int sel; + unsigned int ratio; + + /* + * 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; + + pclk = sclk / (ratio + 1); + + return pclk; +} + +/* s5pc210: return uart clock frequency */ +static unsigned long s5pc210_get_uart_clk(int dev_index) +{ + struct s5pc210_clock *clk = + (struct s5pc210_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; +} + +unsigned long get_pll_clk(int pllreg) +{ + return s5pc210_get_pll_clk(pllreg); +} + +unsigned long get_arm_clk(void) +{ + return s5pc210_get_arm_clk(); +} + +unsigned long get_pwm_clk(void) +{ + return s5pc210_get_pwm_clk(); +} + +unsigned long get_uart_clk(int dev_index) +{ + return s5pc210_get_uart_clk(dev_index); +} |