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authorFurquan Shaikh <furquan@google.com>2014-06-09 13:20:04 -0700
committerMarc Jones <marc.jones@se-eng.com>2015-03-02 21:17:21 +0100
commit732b83ed3667d7c3066d2c16406ab6acdd8f32b9 (patch)
treec8b7252aeab5fe29c175b50e17201e23340daa33 /src/soc/nvidia/tegra132/bootblock_asm.S
parent280a29d5bb5ea53ae92380a95cf8eb4543f96749 (diff)
tegra132: Enable bootblock support in tegra132 including UART support
BUG=None BRANCH=None TEST=Compiles successfully Original-Change-Id: Ia9420cfec5333dd5477f04cf080bdad8a37db025 Original-Signed-off-by: Furquan Shaikh <furquan@google.com> Original-Reviewed-on: https://chromium-review.googlesource.com/203143 Original-Tested-by: Furquan Shaikh <furquan@chromium.org> Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Original-Commit-Queue: Aaron Durbin <adurbin@chromium.org> (cherry picked from commit a1037f203c6a07cb116eeb1632cb7200ad022cd3) This cherry-pick was modified to match the tegra124 uart.c, which uses the idx and base address calculations instead of Kconfig settings. This driver could use the 8250MEM driver when the ARM vs x86 IO calling convention is worked out. Change-Id: I6e439359b8bb541db4679ac144c519cf251ffed6 Signed-off-by: Marc Jones <marc.jones@se-eng.com> Reviewed-on: http://review.coreboot.org/8517 Tested-by: build bot (Jenkins) Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-by: Aaron Durbin <adurbin@google.com>
Diffstat (limited to 'src/soc/nvidia/tegra132/bootblock_asm.S')
-rw-r--r--src/soc/nvidia/tegra132/bootblock_asm.S89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra132/bootblock_asm.S b/src/soc/nvidia/tegra132/bootblock_asm.S
new file mode 100644
index 0000000000..ebd64a7425
--- /dev/null
+++ b/src/soc/nvidia/tegra132/bootblock_asm.S
@@ -0,0 +1,89 @@
+/*
+ * Early initialization code for ARM architecture.
+ *
+ * This file is based off of the OMAP3530/ARM Cortex start.S file from Das
+ * U-Boot, which itself got the file from armboot.
+ *
+ * Copyright (c) 2004 Texas Instruments <r-woodruff2@ti.com>
+ * Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
+ * Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
+ * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de>
+ * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
+ * Copyright (c) 2003 Kshitij <kshitij@ti.com>
+ * Copyright (c) 2006-2008 Syed Mohammed Khasim <x0khasim@ti.com>
+ * Copyright (c) 2013 The Chromium OS Authors
+ *
+ * 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; version 2 of
+ * the License.
+ *
+ * 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 <arch/asm.h>
+
+ENTRY(_start)
+ /*
+ * Set the cpu to System mode with IRQ and FIQ disabled. Prefetch/Data
+ * aborts may happen early and crash before the abort handlers are
+ * installed, but at least the problem will show up near the code that
+ * causes it.
+ */
+ msr cpsr_cxf, #0xdf
+
+ /*
+ * Initialize the stack to a known value. This is used to check for
+ * stack overflow later in the boot process.
+ */
+ ldr r0, .Stack
+ ldr r1, .Stack_size
+ sub r0, r0, r1
+ ldr r1, .Stack
+ ldr r2, =0xdeadbeef
+init_stack_loop:
+ str r2, [r0]
+ add r0, #4
+ cmp r0, r1
+ bne init_stack_loop
+
+/* Set stackpointer in internal RAM to call bootblock main() */
+call_bootblock:
+ ldr sp, .Stack /* Set up stack pointer */
+ ldr r0,=0x00000000
+ /*
+ * The current design of cpu_info places the
+ * struct at the top of the stack. The number of
+ * words pushed must be at least as large as that
+ * struct.
+ */
+ push {r0-r2}
+ bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
+ /*
+ * Use "bl" instead of "b" even though we do not intend to return.
+ * "bl" gets compiled to "blx" if we're transitioning from ARM to
+ * Thumb. However, "b" will not and GCC may attempt to create a
+ * wrapper which is currently broken.
+ */
+ bl main
+ENDPROC(_start)
+
+/* we do it this way because it's a 32-bit constant and
+ * in some cases too far away to be loaded as just an offset
+ * from IP
+ */
+.align 2
+.Stack:
+ .word CONFIG_STACK_TOP
+.align 2
+/* create this size the same way we do in ramstage.ld: top-bottom */
+.Stack_size:
+ .word CONFIG_STACK_TOP - CONFIG_STACK_BOTTOM