[RFC PATCH 05/10] ARM: tegra: Export function to read USB calibration data

[Andrew Bresticker <abrestic@chromium.org>]

Board-specific USB configuration data is stored in FUSE_SKU_CALIB_0.
Export a function to read it so the PHY can be properly configured.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
---
 arch/arm/mach-tegra/fuse.c | 13 +++++++++++++
 include/linux/tegra-soc.h  |  1 +
 2 files changed, 14 insertions(+)

diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c
index c9ac23b..e457ef7 100644
--- a/arch/arm/mach-tegra/fuse.c
+++ b/arch/arm/mach-tegra/fuse.c
@@ -34,6 +34,7 @@
 #define FUSE_UID_HIGH		0x10c
 
 /* Tegra30 and later */
+#define FUSE_USB_CALIB		0x1f0
 #define FUSE_VENDOR_CODE	0x200
 #define FUSE_FAB_CODE		0x204
 #define FUSE_LOT_CODE_0		0x208
@@ -154,6 +155,18 @@ u32 tegra_read_chipid(void)
 	return readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804);
 }
 
+u32 tegra_read_usb_calibration_data(void)
+{
+	u32 reg;
+
+	tegra_fuse_enable_clk();
+	reg = tegra_fuse_readl(FUSE_USB_CALIB);
+	tegra_fuse_disable_clk();
+
+	return reg;
+}
+EXPORT_SYMBOL(tegra_read_usb_calibration_data);
+
 static void __init tegra20_fuse_init_randomness(void)
 {
 	u32 randomness[2];
diff --git a/include/linux/tegra-soc.h b/include/linux/tegra-soc.h
index 95f611d..492dc95 100644
--- a/include/linux/tegra-soc.h
+++ b/include/linux/tegra-soc.h
@@ -18,5 +18,6 @@
 #define __LINUX_TEGRA_SOC_H_
 
 u32 tegra_read_chipid(void);
+u32 tegra_read_usb_calibration_data(void);
 
 #endif /* __LINUX_TEGRA_SOC_H_ */
-- 
1.9.1.423.g4596e3a