1 files changed, 303 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/s5pc1xx/clock.c b/arch/arm/cpu/armv7/s5pc1xx/clock.c
new file mode 100644
index 000000000..19619f92c
--- /dev/null
+++ b/arch/arm/cpu/armv7/s5pc1xx/clock.c
@@ -0,0 +1,303 @@
+/*
+ * 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_pclk)(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 *)S5PC1XX_CLOCK_BASE;
+	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 *)S5PC1XX_CLOCK_BASE;
+	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 *)S5PC1XX_CLOCK_BASE;
+	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 *)S5PC1XX_CLOCK_BASE;
+	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 *)S5PC1XX_CLOCK_BASE;
+	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 *)S5PC1XX_CLOCK_BASE;
+	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 *)S5PC1XX_CLOCK_BASE;
+	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 *)S5PC1XX_CLOCK_BASE;
+	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();
+}
+
+void s5pc1xx_clock_init(void)
+{
+	if (cpu_is_s5pc110()) {
+		get_pll_clk = s5pc110_get_pll_clk;
+		get_arm_clk = s5pc110_get_arm_clk;
+		get_pclk = s5pc110_get_pclk;
+	} else {
+		get_pll_clk = s5pc100_get_pll_clk;
+		get_arm_clk = s5pc100_get_arm_clk;
+		get_pclk = s5pc100_get_pclk;
+	}
+}