linux-kernel - [PATCH v3 1/9] ARM: tegra: Add function to read chipid

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Message-ID: <1357292453-28418-2-git-send-email-pgaikwad@nvidia.com>
Date:	Fri, 4 Jan 2013 15:10:45 +0530
From:	Prashant Gaikwad <pgaikwad@...dia.com>
To:	<mturquette@...aro.org>, <swarren@...dia.com>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Prashant Gaikwad <pgaikwad@...dia.com>
Subject: [PATCH v3 1/9] ARM: tegra: Add function to read chipid

Add function to read chip id from APB MISC registers. This function
will also get called from clock driver to flush write operations on
apb bus.

Signed-off-by: Prashant Gaikwad <pgaikwad@...dia.com>
---
 arch/arm/mach-tegra/fuse.c |   12 ++++++++++--
 include/linux/tegra-soc.h  |   22 ++++++++++++++++++++++
 2 files changed, 32 insertions(+), 2 deletions(-)
 create mode 100644 include/linux/tegra-soc.h

diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c
index 8121742..2cd8ac9 100644
--- a/arch/arm/mach-tegra/fuse.c
+++ b/arch/arm/mach-tegra/fuse.c
@@ -20,6 +20,7 @@
 #include <linux/kernel.h>
 #include <linux/io.h>
 #include <linux/export.h>
+#include <linux/tegra-soc.h>
 
 #include "fuse.h"
 #include "iomap.h"
@@ -105,6 +106,14 @@ static void tegra_get_process_id(void)
 	tegra_core_process_id = (reg >> 12) & 3;
 }
 
+void tegra_read_chipid(void)
+{
+	u32 reg;
+
+	reg = readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804);
+	tegra_chip_id = (reg >> 8) & 0xff;
+}
+
 void tegra_init_fuse(void)
 {
 	u32 id;
@@ -119,8 +128,7 @@ void tegra_init_fuse(void)
 	reg = tegra_apb_readl(TEGRA_APB_MISC_BASE + STRAP_OPT);
 	tegra_bct_strapping = (reg & RAM_ID_MASK) >> RAM_CODE_SHIFT;
 
-	id = readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804);
-	tegra_chip_id = (id >> 8) & 0xff;
+	tegra_read_chipid();
 
 	switch (tegra_chip_id) {
 	case TEGRA20:
diff --git a/include/linux/tegra-soc.h b/include/linux/tegra-soc.h
new file mode 100644
index 0000000..dcbc14c
--- /dev/null
+++ b/include/linux/tegra-soc.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 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 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 __LINUX_TEGRA_SOC_H_
+#define __LINUX_TEGRA_SOC_H_
+
+void tegra_read_chipid(void);
+
+#endif /* __LINUX_TEGRA_SOC_H_ */
-- 
1.7.4.1

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