OMAP3: Add common cpu and start code

Add common cpu and start code.

Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>

1 files changed, 241 insertions, 0 deletions

diff --git a/cpu/arm_cortexa8/cpu.c b/cpu/arm_cortexa8/cpu.c
new file mode 100644
index 0000000000..ebc5ea2669
--- /dev/null
+++ b/cpu/arm_cortexa8/cpu.c
@@ -0,0 +1,241 @@
+/*
+ * (C) Copyright 2008 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 <asm/arch/sys_proto.h>
+
+#ifdef CONFIG_USE_IRQ
+DECLARE_GLOBAL_DATA_PTR;
+#endif
+
+#ifndef CONFIG_L2_OFF
+void l2cache_disable(void);
+#endif
+
+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)
+{
+	/* Many OMAP regs need at least 2 nops */
+	asm("nop");
+	asm("nop");
+}
+
+/* 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 addresses */
+#define RESERVED_1	(0xf << 3)	/* must be 111b for R/W */
+
+int cpu_init(void)
+{
+	/*
+	 * setup up stacks if necessary
+	 */
+#ifdef CONFIG_USE_IRQ
+	IRQ_STACK_START =
+	    _armboot_start - CONFIG_SYS_MALLOC_LEN - CONFIG_SYS_GBL_DATA_SIZE - 4;
+	FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
+#endif
+	return 0;
+}
+
+int cleanup_before_linux(void)
+{
+	unsigned int i;
+
+	/*
+	 * 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();
+
+	/* invalidate I-cache */
+	cache_flush();
+
+#ifndef CONFIG_L2_OFF
+	/* turn off L2 cache */
+	l2cache_disable();
+	/* invalidate L2 cache also */
+	v7_flush_dcache_all(get_device_type());
+#endif
+	i = 0;
+	/* mem barrier to sync up things */
+	asm("mcr p15, 0, %0, c7, c10, 4": :"r"(i));
+
+#ifndef CONFIG_L2_OFF
+	l2cache_enable();
+#endif
+
+	return 0;
+}
+
+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);
+}
+
+void dcache_disable (void)
+{
+	ulong reg;
+
+	reg = read_p15_c1 ();
+	cp_delay ();
+	write_p15_c1 (reg & ~C1_DC);
+}
+
+void l2cache_enable()
+{
+	unsigned long i;
+	volatile unsigned int j;
+
+	/* ES2 onwards we can disable/enable L2 ourselves */
+	if (get_cpu_rev() == CPU_3430_ES2) {
+		__asm__ __volatile__("mrc p15, 0, %0, c1, c0, 1":"=r"(i));
+		__asm__ __volatile__("orr %0, %0, #0x2":"=r"(i));
+		__asm__ __volatile__("mcr p15, 0, %0, c1, c0, 1":"=r"(i));
+	} else {
+		/* Save r0, r12 and restore them after usage */
+		__asm__ __volatile__("mov %0, r12":"=r"(j));
+		__asm__ __volatile__("mov %0, r0":"=r"(i));
+
+		/*
+		 * GP Device ROM code API usage here
+		 * r12 = AUXCR Write function and r0 value
+		 */
+		__asm__ __volatile__("mov r12, #0x3");
+		__asm__ __volatile__("mrc p15, 0, r0, c1, c0, 1");
+		__asm__ __volatile__("orr r0, r0, #0x2");
+		/* SMI instruction to call ROM Code API */
+		__asm__ __volatile__(".word 0xE1600070");
+		__asm__ __volatile__("mov r0, %0":"=r"(i));
+		__asm__ __volatile__("mov r12, %0":"=r"(j));
+	}
+
+}
+
+void l2cache_disable()
+{
+	unsigned long i;
+	volatile unsigned int j;
+
+	/* ES2 onwards we can disable/enable L2 ourselves */
+	if (get_cpu_rev() == CPU_3430_ES2) {
+		__asm__ __volatile__("mrc p15, 0, %0, c1, c0, 1":"=r"(i));
+		__asm__ __volatile__("bic %0, %0, #0x2":"=r"(i));
+		__asm__ __volatile__("mcr p15, 0, %0, c1, c0, 1":"=r"(i));
+	} else {
+		/* Save r0, r12 and restore them after usage */
+		__asm__ __volatile__("mov %0, r12":"=r"(j));
+		__asm__ __volatile__("mov %0, r0":"=r"(i));
+
+		/*
+		 * GP Device ROM code API usage here
+		 * r12 = AUXCR Write function and r0 value
+		 */
+		__asm__ __volatile__("mov r12, #0x3");
+		__asm__ __volatile__("mrc p15, 0, r0, c1, c0, 1");
+		__asm__ __volatile__("bic r0, r0, #0x2");
+		/* SMI instruction to call ROM Code API */
+		__asm__ __volatile__(".word 0xE1600070");
+		__asm__ __volatile__("mov r0, %0":"=r"(i));
+		__asm__ __volatile__("mov r12, %0":"=r"(j));
+	}
+}
+
+int icache_status(void)
+{
+	return (read_p15_c1() & C1_IC) != 0;
+}
+
+static void cache_flush(void)
+{
+	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (0));
+}
+