diff options
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.patch | 290 |
1 files changed, 0 insertions, 290 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 deleted file mode 100644 index 8407b2f998..0000000000 --- a/target/linux/sunxi/patches-3.12/170-sunxi-sid-initial.patch +++ /dev/null @@ -1,290 +0,0 @@ -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 - |