ARM: Add arm1176 core with S3C6400 SoC

Based on the original S3C64XX port by Samsung for U-Boot 1.1.6.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>

1 files changed, 188 insertions, 0 deletions

diff --git a/cpu/arm1176/cpu.c b/cpu/arm1176/cpu.c
new file mode 100644
index 0000000..1e94f7d
--- /dev/null
+++ b/cpu/arm1176/cpu.c
@@ -0,0 +1,188 @@
+/*
+ * (C) Copyright 2004 Texas Insturments
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+ *
+ * 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
+ */
+
+/*
+ * CPU specific code
+ */
+
+#include <common.h>
+#include <command.h>
+#include <s3c6400.h>
+
+static void cache_flush (void);
+
+/* read co-processor 15, register #1 (control register) */
+static unsigned long read_p15_c1 (void)
+{
+	unsigned long value;
+
+	__asm__ __volatile__(
+		"mrc	p15, 0, %0, c1, c0, 0   @ read control reg\n"
+		: "=r" (value)
+		:
+		: "memory");
+	return value;
+}
+
+/* write to co-processor 15, register #1 (control register) */
+static void write_p15_c1 (unsigned long value)
+{
+	__asm__ __volatile__(
+		"mcr	p15, 0, %0, c1, c0, 0   @ write it back\n"
+		:
+		: "r" (value)
+		: "memory");
+
+	read_p15_c1();
+}
+
+static void cp_delay (void)
+{
+	volatile int i;
+
+	/* Many OMAP regs need at least 2 nops  */
+	for (i = 0; i < 100; i++)
+		__asm__ __volatile__("nop\n");
+}
+
+/* See also ARM Ref. Man. */
+#define C1_MMU		(1 << 0)	/* mmu off/on */
+#define C1_ALIGN	(1 << 1)	/* alignment faults off/on */
+#define C1_DC		(1 << 2)	/* dcache off/on */
+#define C1_WB		(1 << 3)	/* merging write buffer on/off */
+#define C1_BIG_ENDIAN	(1 << 7)	/* big endian off/on */
+#define C1_SYS_PROT	(1 << 8)	/* system protection */
+#define C1_ROM_PROT	(1 << 9)	/* ROM protection */
+#define C1_IC		(1 << 12)	/* icache off/on */
+#define C1_HIGH_VECTORS	(1 << 13)	/* location of vectors: low/high */
+#define RESERVED_1	(0xf << 3)	/* must be 111b for R/W */
+
+int cpu_init (void)
+{
+	return 0;
+}
+
+int cleanup_before_linux (void)
+{
+	/*
+	 * this function is called just before we call linux
+	 * it prepares the processor for linux
+	 *
+	 * we turn off caches etc ...
+	 */
+
+	disable_interrupts ();
+
+	/* turn off I/D-cache */
+	icache_disable();
+	dcache_disable();
+	cache_flush();
+
+	return 0;
+}
+
+
+/* * reset the cpu by setting up the watchdog timer and let him time out */
+void reset_cpu (ulong ignored)
+{
+	printf("reset... \n\n\n");
+	SW_RST_REG = 0x6400;
+	/* loop forever and wait for reset to happen */
+	while (1) {
+		if (serial_tstc()) {
+			serial_getc();
+			break;
+		}
+	}
+	/*NOTREACHED*/
+}
+
+int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	disable_interrupts ();
+	reset_cpu (0);
+	/*NOTREACHED*/
+	return 0;
+}
+
+void icache_enable (void)
+{
+	ulong reg;
+
+	reg = read_p15_c1 ();	/* get control reg. */
+	cp_delay ();
+	write_p15_c1 (reg | C1_IC);
+}
+
+void icache_disable (void)
+{
+	ulong reg;
+
+	reg = read_p15_c1 ();
+	cp_delay ();
+	write_p15_c1 (reg & ~C1_IC);
+}
+
+int icache_status (void)
+{
+	return (read_p15_c1 () & C1_IC) != 0;
+}
+
+/* It makes no sense to use the dcache if the MMU is not enabled */
+void dcache_enable (void)
+{
+	ulong reg;
+
+	reg = read_p15_c1 ();
+	cp_delay ();
+	write_p15_c1 (reg | C1_DC);
+}
+
+void dcache_disable (void)
+{
+	ulong reg;
+
+	reg = read_p15_c1 ();
+	cp_delay ();
+	write_p15_c1 (reg & ~C1_DC);
+}
+
+int dcache_status (void)
+{
+	return (read_p15_c1 () & C1_DC) != 0;
+}
+
+/* flush I/D-cache */
+static void cache_flush (void)
+{
+	/* invalidate both caches and flush btb */
+	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (0));
+	/* mem barrier to sync things */
+	asm ("mcr p15, 0, %0, c7, c10, 4": :"r" (0));
+}