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authorPrashant Gaikwad <pgaikwad@nvidia.com>2013-01-11 13:16:19 +0530
committerStephen Warren <swarren@nvidia.com>2013-01-28 11:19:06 -0700
commitc7736edf1b1734455c186deec53a0aa7f8fa87ea (patch)
treec2333faf5e2dacb726f60591ddb1e27d611dc7d4
parent24e30c9417230b359bf6dfeb923e90138df7c112 (diff)
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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@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
-rw-r--r--arch/arm/mach-tegra/fuse.c8
-rw-r--r--include/linux/tegra-soc.h22
2 files changed, 29 insertions, 1 deletions
diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c
index 8121742..f7db078 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 +106,11 @@ static void tegra_get_process_id(void)
tegra_core_process_id = (reg >> 12) & 3;
}
+u32 tegra_read_chipid(void)
+{
+ return readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804);
+}
+
void tegra_init_fuse(void)
{
u32 id;
@@ -119,7 +125,7 @@ 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);
+ id = tegra_read_chipid();
tegra_chip_id = (id >> 8) & 0xff;
switch (tegra_chip_id) {
diff --git a/include/linux/tegra-soc.h b/include/linux/tegra-soc.h
new file mode 100644
index 0000000..95f611d
--- /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_
+
+u32 tegra_read_chipid(void);
+
+#endif /* __LINUX_TEGRA_SOC_H_ */