1 files changed, 145 insertions, 0 deletions
diff --git a/cpu/arm1176/s3c64xx/speed.c b/cpu/arm1176/s3c64xx/speed.c
new file mode 100644
index 0000000..5c335a5
--- /dev/null
+++ b/cpu/arm1176/s3c64xx/speed.c
@@ -0,0 +1,145 @@
+/*
+ * (C) Copyright 2001-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2002
+ * David Mueller, ELSOFT AG, d.mueller@elsoft.ch
+ *
+ * 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
+ */
+
+/*
+ * This code should work for both the S3C2400 and the S3C2410
+ * as they seem to have the same PLL and clock machinery inside.
+ * The different address mapping is handled by the s3c24xx.h files below.
+ */
+
+#include <common.h>
+#include <s3c6400.h>
+
+#define APLL 0
+#define MPLL 1
+#define EPLL 2
+
+/* ------------------------------------------------------------------------- */
+/*
+ * NOTE: This describes the proper use of this file.
+ *
+ * CONFIG_SYS_CLK_FREQ should be defined as the input frequency of the PLL.
+ *
+ * get_FCLK(), get_HCLK(), get_PCLK() and get_UCLK() return the clock of
+ * the specified bus in HZ.
+ */
+/* ------------------------------------------------------------------------- */
+
+static ulong get_PLLCLK(int pllreg)
+{
+	ulong r, m, p, s;
+
+	switch (pllreg) {
+	case APLL:
+		r = APLL_CON_REG;
+		break;
+	case MPLL:
+		r = MPLL_CON_REG;
+		break;
+	case EPLL:
+		r = EPLL_CON0_REG;
+		break;
+	default:
+		hang();
+	}
+
+	m = (r >> 16) & 0x3ff;
+	p = (r >> 8) & 0x3f;
+	s = r & 0x7;
+
+	return m * (CONFIG_SYS_CLK_FREQ / (p * (1 << s)));
+}
+
+/* return ARMCORE frequency */
+ulong get_ARMCLK(void)
+{
+	ulong div;
+
+	div = CLK_DIV0_REG;
+
+	return get_PLLCLK(APLL) / ((div & 0x7) + 1);
+}
+
+/* return FCLK frequency */
+ulong get_FCLK(void)
+{
+	return get_PLLCLK(APLL);
+}
+
+/* return HCLK frequency */
+ulong get_HCLK(void)
+{
+	ulong fclk;
+
+	uint hclkx2_div = ((CLK_DIV0_REG >> 9) & 0x7) + 1;
+	uint hclk_div = ((CLK_DIV0_REG >> 8) & 0x1) + 1;
+
+	/*
+	 * Bit 7 exists on s3c6410, and not on s3c6400, it is reserved on
+	 * s3c6400 and is always 0, and it is indeed running in ASYNC mode
+	 */
+	if (OTHERS_REG & 0x80)
+		fclk = get_FCLK();		/* SYNC Mode	*/
+	else
+		fclk = get_PLLCLK(MPLL);	/* ASYNC Mode	*/
+
+	return fclk / (hclk_div * hclkx2_div);
+}
+
+/* return PCLK frequency */
+ulong get_PCLK(void)
+{
+	ulong fclk;
+	uint hclkx2_div = ((CLK_DIV0_REG >> 9) & 0x7) + 1;
+	uint pre_div = ((CLK_DIV0_REG >> 12) & 0xf) + 1;
+
+	if (OTHERS_REG & 0x80)
+		fclk = get_FCLK();		/* SYNC Mode	*/
+	else
+		fclk = get_PLLCLK(MPLL);	/* ASYNC Mode	*/
+
+	return fclk / (hclkx2_div * pre_div);
+}
+
+/* return UCLK frequency */
+ulong get_UCLK(void)
+{
+	return get_PLLCLK(EPLL);
+}
+
+int print_cpuinfo(void)
+{
+	printf("\nCPU:     S3C6400@%luMHz\n", get_ARMCLK() / 1000000);
+	printf("         Fclk = %luMHz, Hclk = %luMHz, Pclk = %luMHz ",
+	       get_FCLK() / 1000000, get_HCLK() / 1000000,
+	       get_PCLK() / 1000000);
+
+	if (OTHERS_REG & 0x80)
+		printf("(SYNC Mode) \n");
+	else
+		printf("(ASYNC Mode) \n");
+	return 0;
+}