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

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Date:	Wed, 14 May 2014 17:33:01 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	linux-tegra@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-usb@...r.kernel.org
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Andrew Bresticker <abrestic@...omium.org>
Subject: [RFC PATCH 05/10] ARM: tegra: Export function to read USB calibration data

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@...omium.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

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