Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753890Ab3FQU4D (ORCPT ); Mon, 17 Jun 2013 16:56:03 -0400 Received: from 7of9.schinagl.nl ([88.159.158.68]:58520 "EHLO 7of9.schinagl.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753493Ab3FQU4B (ORCPT ); Mon, 17 Jun 2013 16:56:01 -0400 From: Oliver Schinagl To: arnd@arndb.de, gregkh@linuxfoundation.org Cc: maxime.ripard@free-electrons.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, andy.shevchenko@gmail.com, linux@arm.linux.org.uk, linus.walleij@linaro.org, linux-sunxi@googlegroups.com, Oliver Schinagl Subject: [PATCH] v4 Driver for Allwinner sunxi Security ID Date: Mon, 17 Jun 2013 22:53:43 +0200 Message-Id: <1371502424-15054-1-git-send-email-oliver+list@schinagl.nl> X-Mailer: git-send-email 1.8.1.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2546 Lines: 61 Changes from v3: * Cleanup comments * Remove last byte masking and useless casting, the C standard guarntees we are ok * Removed some complexity from sid_read, thanks to Russel * Replace dev_info with dev_dbg reducing the verbosity * Removed driver version * Reorderd variable declrations based on usage, return value always last * Removed all goto in exchange for return, due to popular request * Reduced line count by removing extra lines Changes from v2: * Removed the global pointer, we can change that when the need for external access arises * Fixed header inclusions * Corrected if guards. There where some crude mistakes there * Changed offset to an unsigned int so we don't have to worry about negatives * Cleaned up variable declarations * Changed ret value, ENXIO (No device/io) as that better matches a missing dt * Made the loading informercial print version so it is somewhat usefull Changes from v1: * Renamed the sys-fs exported key to eeprom, since it really a read-only eeprom * Removed mention of sun[67]i since we haven't tested those * Fixed up mistakes in comments * Removed PAGE_SIZE references, since this is a binary only driver * Removed lookup table and calculate offsets better * Use proper endianess * Add the SID to seed the kernel entropy pool * Rewrite probe to use platform_get_resource/devm_ioremap_resource instead The Allwinner A-series of SoC's have efuses exposed via registers to read the factory programmed e-fuses. These should in theory be programmable but this is still to be confirmed. It does appear that these fuses are unique enough to be used as serial numbers, RSA keys, generate MAC addresses from etc. If it turns out to be user programmable, the use obviously increases. Allwinner did use the fuses initially to determine the chip-type. This driver supports all currently known chips based on datasheets and 'dumped' drivers that we have so far, the dts is only implemented for known chips. It has been tested on a Cubieboard 1 This is my very first driver so please try to be gentle Oliver Schinagl (1): Add sunxi-sid to dts for sun4i and sun5i arch/arm/boot/dts/sun4i-a10.dtsi | 5 +++++ arch/arm/boot/dts/sun5i-a13.dtsi | 5 +++++ 2 files changed, 10 insertions(+) -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/