arm: rmobile: Add support Renesas SH73A0

Renesas SH73A0 is CPU with Cortex-A9.
This supports the basic register definition and GPIO.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

1 files changed, 95 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/rmobile/lowlevel_init.S b/arch/arm/cpu/armv7/rmobile/lowlevel_init.S
new file mode 100644
index 000000000..2cd410b70
--- /dev/null
+++ b/arch/arm/cpu/armv7/rmobile/lowlevel_init.S
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2012 Nobuhiro Iwamatsu <nobuhiro.Iwamatsu.yj@renesas.com>
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ *
+ * 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 <config.h>
+#include <linux/linkage.h>
+
+ENTRY(lowlevel_init)
+	ldr		r0, =MERAM_BASE
+	mov		r1, #0x0
+	str		r1, [r0]
+
+	mrc		p15, 0, r0, c0, c0, 5
+	ands	r0, r0, #0xF
+	beq		lowlevel_init__
+	b		wait_interrupt
+
+	.pool
+	.align 4
+
+wait_interrupt:
+	ldr     r1, =ICCICR
+	mov     r2, #0x0
+	str     r2, [r1]
+	mov     r2, #0xF0
+	adds    r1, r1, #4 /* ICCPMR */
+	str     r2, [r1]
+	ldr     r1, =ICCICR
+	mov     r2, #0x1
+	str     r2, [r1]
+
+wait_loop:
+	wfi
+
+	ldr		r2, [r1, #0xC]
+	str		r2, [r1, #0x10]
+
+	ldr		r0, =MERAM_BASE
+	ldr		r2, [r0]
+	cmp		r2, #0
+	movne	pc, r2
+
+	b		wait_loop
+
+wait_loop_end:
+	.pool
+	.align 4
+
+lowlevel_init__:
+
+	mov r0, #0x200000
+
+loop0:
+	subs r0, r0, #1
+	bne  loop0
+
+	ldr sp, MERAM_STACK
+
+	str ip, [sp]    /* stash old link register */
+	mov ip, lr      /* save link reg across call */
+	bl  s_init
+
+	ldr ip, [sp]    /* restore save ip */
+	mov lr, ip      /* restore link reg */
+
+	/* back to arch calling code */
+	mov pc, lr
+
+	.pool
+	.align 4
+
+ENDPROC(lowlevel_init)
+	.ltorg
+
+MERAM_STACK:
+	.word LOW_LEVEL_MERAM_STACK