linux-kernel - [PATCH v1 1/8] ARM: tegra: introduce support for reading chipid

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Date:	Thu, 26 Jan 2012 19:07:06 +0200
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
Cc:	Colin Cross <ccross@...roid.com>, Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dia.com>,
	Russell King <linux@....linux.org.uk>,
	Gary King <gking@...dia.com>, Arnd Bergmann <arnd@...db.de>,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/8] ARM: tegra: introduce support for reading chipid

Introduce a function to read the Tegra chipid. This will be used by the SMP
code to distinguish between Tegra variants.

---

Should this be merged with the fuse reading code even though this is a
hardwired register, not a fuse based register?

Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
---
 arch/arm/mach-tegra/chipid.h |   38 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 38 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/mach-tegra/chipid.h

diff --git a/arch/arm/mach-tegra/chipid.h b/arch/arm/mach-tegra/chipid.h
new file mode 100644
index 0000000..beb6a66
--- /dev/null
+++ b/arch/arm/mach-tegra/chipid.h
@@ -0,0 +1,38 @@
+/*
+ * arch/arm/mach-tegra/chipid.h
+ *
+ * Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __MACH_TEGRA_CHIPID_H
+#define __MACH_TEGRA_CHIPID_H
+
+#define APB_MISC_GP_HIDREV	0x804
+
+#define	TEGRA20			0x20
+#define	TEGRA30			0x30
+
+#ifndef __ASSEMBLY__
+
+#include <asm/io.h>
+
+static inline u32 tegra_get_chipid(void)
+{
+	return readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) +
+				APB_MISC_GP_HIDREV) >> 8 & 0xff;
+}
+
+#endif
+#endif
-- 
1.7.7.rc0.72.g4b5ea.dirty

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