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authorZoltan Herpai <wigyori@uid0.hu>2013-11-14 23:12:52 +0000
committerZoltan Herpai <wigyori@uid0.hu>2013-11-14 23:12:52 +0000
commitf58bfd1df4e4a9b84a0e94691986c38bab6d8730 (patch)
tree9efce69525f7b07a108c03ba53b6721ebb1c8be2 /target/linux/sunxi/patches-3.12/170-sunxi-sid-initial.patch
parent2077361f128ff32dd6bb9fed7a4b3cd813863a9c (diff)
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sunxi: rework target - update kernel to 3.12 - add patches for clocks, i2c, usb, sid, rtc - support common image for A10/A13/A20 - add support for a couple boards - most drivers are configured into the kernel as of now
Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu> SVN-Revision: 38811
Diffstat (limited to 'target/linux/sunxi/patches-3.12/170-sunxi-sid-initial.patch')
-rw-r--r--target/linux/sunxi/patches-3.12/170-sunxi-sid-initial.patch290
1 files changed, 290 insertions, 0 deletions
diff --git a/target/linux/sunxi/patches-3.12/170-sunxi-sid-initial.patch b/target/linux/sunxi/patches-3.12/170-sunxi-sid-initial.patch
new file mode 100644
index 0000000000..8407b2f998
--- /dev/null
+++ b/target/linux/sunxi/patches-3.12/170-sunxi-sid-initial.patch
@@ -0,0 +1,290 @@
+From 1d4b3ab562fa87e2c7f05cf92af1ff4b6cd42581 Mon Sep 17 00:00:00 2001
+From: Oliver Schinagl <oliver@schinagl.nl>
+Date: Tue, 3 Sep 2013 12:33:27 +0200
+Subject: [PATCH] ARM: sunxi: Initial support for Allwinner's Security ID fuses
+
+Allwinner has electric fuses (efuse) on their line of chips. This driver
+reads those fuses, seeds the kernel entropy and exports them as a sysfs
+node.
+
+These fuses are most likely to be programmed at the factory, encoding
+things like Chip ID, some sort of serial number, etc. and appear to be
+reasonably unique.
+While in theory, these should be writeable by the user, it will probably
+be inconvenient to do so. Allwinner recommends that a certain input pin,
+labeled 'efuse_vddq', be connected to GND. To write these fuses however,
+a 2.5 V programming voltage needs to be applied to this pin.
+
+Even so, they can still be used to generate a board-unique mac from,
+board unique RSA key and seed the kernel RNG.
+
+On sun7i additional storage is available, this is initially used for an
+UEFI BOOT key, Secure JTAG key, HDMI-HDCP key and vendor specific keys.
+
+Currently supported are the following known chips:
+Allwinner sun4i (A10)
+Allwinner sun5i (A10s, A13)
+Allwinner sun7i (A20)
+
+Signed-off-by: Oliver Schinagl <oliver@schinagl.nl>
+---
+ Documentation/ABI/testing/sysfs-driver-sunxi-sid | 22 +++
+ .../bindings/misc/allwinner,sunxi-sid.txt | 17 +++
+ drivers/misc/eeprom/Kconfig | 13 ++
+ drivers/misc/eeprom/Makefile | 1 +
+ drivers/misc/eeprom/sunxi_sid.c | 158 +++++++++++++++++++++
+ 5 files changed, 211 insertions(+)
+ create mode 100644 Documentation/ABI/testing/sysfs-driver-sunxi-sid
+ create mode 100644 Documentation/devicetree/bindings/misc/allwinner,sunxi-sid.txt
+ create mode 100644 drivers/misc/eeprom/sunxi_sid.c
+
+diff --git a/Documentation/ABI/testing/sysfs-driver-sunxi-sid b/Documentation/ABI/testing/sysfs-driver-sunxi-sid
+new file mode 100644
+index 0000000..ffb9536
+--- /dev/null
++++ b/Documentation/ABI/testing/sysfs-driver-sunxi-sid
+@@ -0,0 +1,22 @@
++What: /sys/devices/*/<our-device>/eeprom
++Date: August 2013
++Contact: Oliver Schinagl <oliver@schinagl.nl>
++Description: read-only access to the SID (Security-ID) on current
++ A-series SoC's from Allwinner. Currently supports A10, A10s, A13
++ and A20 CPU's. The earlier A1x series of SoCs exports 16 bytes,
++ whereas the newer A20 SoC exposes 512 bytes split into sections.
++ Besides the 16 bytes of SID, there's also an SJTAG area,
++ HDMI-HDCP key and some custom keys. Below a quick overview, for
++ details see the user manual:
++ 0x000 128 bit root-key (sun[457]i)
++ 0x010 128 bit boot-key (sun7i)
++ 0x020 64 bit security-jtag-key (sun7i)
++ 0x028 16 bit key configuration (sun7i)
++ 0x02b 16 bit custom-vendor-key (sun7i)
++ 0x02c 320 bit low general key (sun7i)
++ 0x040 32 bit read-control access (sun7i)
++ 0x064 224 bit low general key (sun7i)
++ 0x080 2304 bit HDCP-key (sun7i)
++ 0x1a0 768 bit high general key (sun7i)
++Users: any user space application which wants to read the SID on
++ Allwinner's A-series of CPU's.
+diff --git a/Documentation/devicetree/bindings/misc/allwinner,sunxi-sid.txt b/Documentation/devicetree/bindings/misc/allwinner,sunxi-sid.txt
+new file mode 100644
+index 0000000..68ba372
+--- /dev/null
++++ b/Documentation/devicetree/bindings/misc/allwinner,sunxi-sid.txt
+@@ -0,0 +1,17 @@
++Allwinner sunxi-sid
++
++Required properties:
++- compatible: "allwinner,sun4i-sid" or "allwinner,sun7i-a20-sid".
++- reg: Should contain registers location and length
++
++Example for sun4i:
++ sid@01c23800 {
++ compatible = "allwinner,sun4i-sid";
++ reg = <0x01c23800 0x10>
++ };
++
++Example for sun7i:
++ sid@01c23800 {
++ compatible = "allwinner,sun7i-a20-sid";
++ reg = <0x01c23800 0x200>
++ };
+diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig
+index 04f2e1f..9536852f 100644
+--- a/drivers/misc/eeprom/Kconfig
++++ b/drivers/misc/eeprom/Kconfig
+@@ -96,4 +96,17 @@ config EEPROM_DIGSY_MTC_CFG
+
+ If unsure, say N.
+
++config EEPROM_SUNXI_SID
++ tristate "Allwinner sunxi security ID support"
++ depends on ARCH_SUNXI && SYSFS
++ help
++ This is a driver for the 'security ID' available on various Allwinner
++ devices.
++
++ Due to the potential risks involved with changing e-fuses,
++ this driver is read-only.
++
++ This driver can also be built as a module. If so, the module
++ will be called sunxi_sid.
++
+ endmenu
+diff --git a/drivers/misc/eeprom/Makefile b/drivers/misc/eeprom/Makefile
+index fc1e81d..9507aec 100644
+--- a/drivers/misc/eeprom/Makefile
++++ b/drivers/misc/eeprom/Makefile
+@@ -4,4 +4,5 @@ obj-$(CONFIG_EEPROM_LEGACY) += eeprom.o
+ obj-$(CONFIG_EEPROM_MAX6875) += max6875.o
+ obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o
+ obj-$(CONFIG_EEPROM_93XX46) += eeprom_93xx46.o
++obj-$(CONFIG_EEPROM_SUNXI_SID) += sunxi_sid.o
+ obj-$(CONFIG_EEPROM_DIGSY_MTC_CFG) += digsy_mtc_eeprom.o
+diff --git a/drivers/misc/eeprom/sunxi_sid.c b/drivers/misc/eeprom/sunxi_sid.c
+new file mode 100644
+index 0000000..9c34e57
+--- /dev/null
++++ b/drivers/misc/eeprom/sunxi_sid.c
+@@ -0,0 +1,158 @@
++/*
++ * Copyright (c) 2013 Oliver Schinagl <oliver@schinagl.nl>
++ * http://www.linux-sunxi.org
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that 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.
++ *
++ * This driver exposes the Allwinner security ID, efuses exported in byte-
++ * sized chunks.
++ */
++
++#include <linux/compiler.h>
++#include <linux/device.h>
++#include <linux/err.h>
++#include <linux/export.h>
++#include <linux/fs.h>
++#include <linux/init.h>
++#include <linux/io.h>
++#include <linux/kernel.h>
++#include <linux/kobject.h>
++#include <linux/module.h>
++#include <linux/of_device.h>
++#include <linux/platform_device.h>
++#include <linux/random.h>
++#include <linux/slab.h>
++#include <linux/stat.h>
++#include <linux/sysfs.h>
++#include <linux/types.h>
++
++#define DRV_NAME "sunxi-sid"
++
++struct sunxi_sid_data {
++ void __iomem *reg_base;
++ unsigned int keysize;
++};
++
++/* We read the entire key, due to a 32 bit read alignment requirement. Since we
++ * want to return the requested byte, this results in somewhat slower code and
++ * uses 4 times more reads as needed but keeps code simpler. Since the SID is
++ * only very rarely probed, this is not really an issue.
++ */
++static u8 sunxi_sid_read_byte(const struct sunxi_sid_data *sid_data,
++ const unsigned int offset)
++{
++ u32 sid_key;
++
++ if (offset >= sid_data->keysize)
++ return 0;
++
++ sid_key = ioread32be(sid_data->reg_base + round_down(offset, 4));
++ sid_key >>= (offset % 4) * 8;
++
++ return sid_key; /* Only return the last byte */
++}
++
++static ssize_t sid_read(struct file *fd, struct kobject *kobj,
++ struct bin_attribute *attr, char *buf,
++ loff_t pos, size_t size)
++{
++ struct platform_device *pdev;
++ struct sunxi_sid_data *sid_data;
++ int i;
++
++ pdev = to_platform_device(kobj_to_dev(kobj));
++ sid_data = platform_get_drvdata(pdev);
++
++ if (pos < 0 || pos >= sid_data->keysize)
++ return 0;
++ if (size > sid_data->keysize - pos)
++ size = sid_data->keysize - pos;
++
++ for (i = 0; i < size; i++)
++ buf[i] = sunxi_sid_read_byte(sid_data, pos + i);
++
++ return i;
++}
++
++static struct bin_attribute sid_bin_attr = {
++ .attr = { .name = "eeprom", .mode = S_IRUGO, },
++ .read = sid_read,
++};
++
++static int sunxi_sid_remove(struct platform_device *pdev)
++{
++ device_remove_bin_file(&pdev->dev, &sid_bin_attr);
++ dev_dbg(&pdev->dev, "driver unloaded\n");
++
++ return 0;
++}
++
++static const struct of_device_id sunxi_sid_of_match[] = {
++ { .compatible = "allwinner,sun4i-sid", .data = (void *)16},
++ { .compatible = "allwinner,sun7i-a20-sid", .data = (void *)512},
++ {/* sentinel */},
++};
++MODULE_DEVICE_TABLE(of, sunxi_sid_of_match);
++
++static int sunxi_sid_probe(struct platform_device *pdev)
++{
++ struct sunxi_sid_data *sid_data;
++ struct resource *res;
++ const struct of_device_id *of_dev_id;
++ u8 *entropy;
++ unsigned int i;
++
++ sid_data = devm_kzalloc(&pdev->dev, sizeof(struct sunxi_sid_data),
++ GFP_KERNEL);
++ if (!sid_data)
++ return -ENOMEM;
++
++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ sid_data->reg_base = devm_ioremap_resource(&pdev->dev, res);
++ if (IS_ERR(sid_data->reg_base))
++ return PTR_ERR(sid_data->reg_base);
++
++ of_dev_id = of_match_device(sunxi_sid_of_match, &pdev->dev);
++ if (!of_dev_id)
++ return -ENODEV;
++ sid_data->keysize = (int)of_dev_id->data;
++
++ platform_set_drvdata(pdev, sid_data);
++
++ sid_bin_attr.size = sid_data->keysize;
++ if (device_create_bin_file(&pdev->dev, &sid_bin_attr))
++ return -ENODEV;
++
++ entropy = kzalloc(sizeof(u8) * sid_data->keysize, GFP_KERNEL);
++ for (i = 0; i < sid_data->keysize; i++)
++ entropy[i] = sunxi_sid_read_byte(sid_data, i);
++ add_device_randomness(entropy, sid_data->keysize);
++ kfree(entropy);
++
++ dev_dbg(&pdev->dev, "loaded\n");
++
++ return 0;
++}
++
++static struct platform_driver sunxi_sid_driver = {
++ .probe = sunxi_sid_probe,
++ .remove = sunxi_sid_remove,
++ .driver = {
++ .name = DRV_NAME,
++ .owner = THIS_MODULE,
++ .of_match_table = sunxi_sid_of_match,
++ },
++};
++module_platform_driver(sunxi_sid_driver);
++
++MODULE_AUTHOR("Oliver Schinagl <oliver@schinagl.nl>");
++MODULE_DESCRIPTION("Allwinner sunxi security id driver");
++MODULE_LICENSE("GPL");
+--
+1.8.4
+