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nvmem: sunxi: Move the SID driver to the nvmem framework
Now that we have the nvmem framework, we can consolidate the common driver code. Move the driver to the framework, and hopefully, it will fix the sysfs file creation race. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> [srinivas.kandagatla: Moved to regmap based EEPROM framework] Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Tested-by: Philipp Zabel <p.zabel@pengutronix.de> Tested-by: Rajendra Nayak <rnayak@codeaurora.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maxime Ripard
Greg Kroah-Hartman
parent
b470d6d7a5
commit
3d0b16a66c
@ -1,22 +0,0 @@
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What: /sys/devices/*/<our-device>/eeprom
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Date: August 2013
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Contact: Oliver Schinagl <oliver@schinagl.nl>
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Description: read-only access to the SID (Security-ID) on current
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A-series SoC's from Allwinner. Currently supports A10, A10s, A13
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and A20 CPU's. The earlier A1x series of SoCs exports 16 bytes,
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whereas the newer A20 SoC exposes 512 bytes split into sections.
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Besides the 16 bytes of SID, there's also an SJTAG area,
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HDMI-HDCP key and some custom keys. Below a quick overview, for
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details see the user manual:
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0x000 128 bit root-key (sun[457]i)
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0x010 128 bit boot-key (sun7i)
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0x020 64 bit security-jtag-key (sun7i)
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0x028 16 bit key configuration (sun7i)
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0x02b 16 bit custom-vendor-key (sun7i)
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0x02c 320 bit low general key (sun7i)
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0x040 32 bit read-control access (sun7i)
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0x064 224 bit low general key (sun7i)
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0x080 2304 bit HDCP-key (sun7i)
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0x1a0 768 bit high general key (sun7i)
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Users: any user space application which wants to read the SID on
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Allwinner's A-series of CPU's.
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@ -4,6 +4,10 @@ Required properties:
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- compatible: "allwinner,sun4i-a10-sid" or "allwinner,sun7i-a20-sid"
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- reg: Should contain registers location and length
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= Data cells =
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Are child nodes of qfprom, bindings of which as described in
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bindings/nvmem/nvmem.txt
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Example for sun4i:
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sid@01c23800 {
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compatible = "allwinner,sun4i-a10-sid";
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@ -96,17 +96,4 @@ config EEPROM_DIGSY_MTC_CFG
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If unsure, say N.
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config EEPROM_SUNXI_SID
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tristate "Allwinner sunxi security ID support"
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depends on ARCH_SUNXI && SYSFS
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help
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This is a driver for the 'security ID' available on various Allwinner
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devices.
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Due to the potential risks involved with changing e-fuses,
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this driver is read-only.
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This driver can also be built as a module. If so, the module
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will be called sunxi_sid.
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endmenu
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@ -4,5 +4,4 @@ obj-$(CONFIG_EEPROM_LEGACY) += eeprom.o
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obj-$(CONFIG_EEPROM_MAX6875) += max6875.o
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obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o
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obj-$(CONFIG_EEPROM_93XX46) += eeprom_93xx46.o
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obj-$(CONFIG_EEPROM_SUNXI_SID) += sunxi_sid.o
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obj-$(CONFIG_EEPROM_DIGSY_MTC_CFG) += digsy_mtc_eeprom.o
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@ -1,156 +0,0 @@
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/*
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* Copyright (c) 2013 Oliver Schinagl <oliver@schinagl.nl>
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* http://www.linux-sunxi.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* This driver exposes the Allwinner security ID, efuses exported in byte-
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* sized chunks.
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*/
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#include <linux/compiler.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/fs.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/kobject.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/sysfs.h>
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#include <linux/types.h>
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#define DRV_NAME "sunxi-sid"
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struct sunxi_sid_data {
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void __iomem *reg_base;
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unsigned int keysize;
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};
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/* We read the entire key, due to a 32 bit read alignment requirement. Since we
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* want to return the requested byte, this results in somewhat slower code and
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* uses 4 times more reads as needed but keeps code simpler. Since the SID is
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* only very rarely probed, this is not really an issue.
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*/
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static u8 sunxi_sid_read_byte(const struct sunxi_sid_data *sid_data,
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const unsigned int offset)
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{
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u32 sid_key;
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if (offset >= sid_data->keysize)
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return 0;
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sid_key = ioread32be(sid_data->reg_base + round_down(offset, 4));
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sid_key >>= (offset % 4) * 8;
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return sid_key; /* Only return the last byte */
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}
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static ssize_t sid_read(struct file *fd, struct kobject *kobj,
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struct bin_attribute *attr, char *buf,
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loff_t pos, size_t size)
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{
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struct platform_device *pdev;
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struct sunxi_sid_data *sid_data;
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int i;
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pdev = to_platform_device(kobj_to_dev(kobj));
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sid_data = platform_get_drvdata(pdev);
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if (pos < 0 || pos >= sid_data->keysize)
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return 0;
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if (size > sid_data->keysize - pos)
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size = sid_data->keysize - pos;
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for (i = 0; i < size; i++)
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buf[i] = sunxi_sid_read_byte(sid_data, pos + i);
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return i;
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}
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static struct bin_attribute sid_bin_attr = {
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.attr = { .name = "eeprom", .mode = S_IRUGO, },
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.read = sid_read,
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};
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static int sunxi_sid_remove(struct platform_device *pdev)
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{
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device_remove_bin_file(&pdev->dev, &sid_bin_attr);
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dev_dbg(&pdev->dev, "driver unloaded\n");
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return 0;
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}
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static const struct of_device_id sunxi_sid_of_match[] = {
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{ .compatible = "allwinner,sun4i-a10-sid", .data = (void *)16},
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{ .compatible = "allwinner,sun7i-a20-sid", .data = (void *)512},
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, sunxi_sid_of_match);
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static int sunxi_sid_probe(struct platform_device *pdev)
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{
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struct sunxi_sid_data *sid_data;
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struct resource *res;
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const struct of_device_id *of_dev_id;
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u8 *entropy;
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unsigned int i;
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sid_data = devm_kzalloc(&pdev->dev, sizeof(struct sunxi_sid_data),
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GFP_KERNEL);
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if (!sid_data)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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sid_data->reg_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(sid_data->reg_base))
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return PTR_ERR(sid_data->reg_base);
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of_dev_id = of_match_device(sunxi_sid_of_match, &pdev->dev);
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if (!of_dev_id)
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return -ENODEV;
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sid_data->keysize = (int)of_dev_id->data;
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platform_set_drvdata(pdev, sid_data);
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sid_bin_attr.size = sid_data->keysize;
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if (device_create_bin_file(&pdev->dev, &sid_bin_attr))
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return -ENODEV;
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entropy = kzalloc(sizeof(u8) * sid_data->keysize, GFP_KERNEL);
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for (i = 0; i < sid_data->keysize; i++)
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entropy[i] = sunxi_sid_read_byte(sid_data, i);
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add_device_randomness(entropy, sid_data->keysize);
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kfree(entropy);
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dev_dbg(&pdev->dev, "loaded\n");
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return 0;
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}
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static struct platform_driver sunxi_sid_driver = {
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.probe = sunxi_sid_probe,
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.remove = sunxi_sid_remove,
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.driver = {
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.name = DRV_NAME,
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.of_match_table = sunxi_sid_of_match,
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},
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};
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module_platform_driver(sunxi_sid_driver);
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MODULE_AUTHOR("Oliver Schinagl <oliver@schinagl.nl>");
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MODULE_DESCRIPTION("Allwinner sunxi security id driver");
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MODULE_LICENSE("GPL");
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@ -25,4 +25,15 @@ config QCOM_QFPROM
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This driver can also be built as a module. If so, the module
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will be called nvmem_qfprom.
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config NVMEM_SUNXI_SID
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tristate "Allwinner SoCs SID support"
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depends on ARCH_SUNXI
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select REGMAP_MMIO
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help
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This is a driver for the 'security ID' available on various Allwinner
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devices.
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This driver can also be built as a module. If so, the module
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will be called nvmem_sunxi_sid.
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endif
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@ -8,3 +8,5 @@ nvmem_core-y := core.o
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# Devices
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obj-$(CONFIG_QCOM_QFPROM) += nvmem_qfprom.o
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nvmem_qfprom-y := qfprom.o
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obj-$(CONFIG_NVMEM_SUNXI_SID) += nvmem_sunxi_sid.o
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nvmem_sunxi_sid-y := sunxi_sid.o
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171
drivers/nvmem/sunxi_sid.c
Normal file
171
drivers/nvmem/sunxi_sid.c
Normal file
@ -0,0 +1,171 @@
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/*
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* Allwinner sunXi SoCs Security ID support.
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*
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* Copyright (c) 2013 Oliver Schinagl <oliver@schinagl.nl>
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* Copyright (C) 2014 Maxime Ripard <maxime.ripard@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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static struct nvmem_config econfig = {
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.name = "sunxi-sid",
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.read_only = true,
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.owner = THIS_MODULE,
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};
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struct sunxi_sid {
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void __iomem *base;
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};
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/* We read the entire key, due to a 32 bit read alignment requirement. Since we
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* want to return the requested byte, this results in somewhat slower code and
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* uses 4 times more reads as needed but keeps code simpler. Since the SID is
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* only very rarely probed, this is not really an issue.
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*/
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static u8 sunxi_sid_read_byte(const struct sunxi_sid *sid,
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const unsigned int offset)
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{
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u32 sid_key;
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sid_key = ioread32be(sid->base + round_down(offset, 4));
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sid_key >>= (offset % 4) * 8;
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return sid_key; /* Only return the last byte */
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}
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static int sunxi_sid_read(void *context,
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const void *reg, size_t reg_size,
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void *val, size_t val_size)
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{
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struct sunxi_sid *sid = context;
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unsigned int offset = *(u32 *)reg;
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u8 *buf = val;
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while (val_size) {
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*buf++ = sunxi_sid_read_byte(sid, offset);
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val_size--;
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offset++;
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}
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return 0;
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}
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static int sunxi_sid_write(void *context, const void *data, size_t count)
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{
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/* Unimplemented, dummy to keep regmap core happy */
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return 0;
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}
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static struct regmap_bus sunxi_sid_bus = {
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.read = sunxi_sid_read,
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.write = sunxi_sid_write,
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.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
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.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
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};
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static bool sunxi_sid_writeable_reg(struct device *dev, unsigned int reg)
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{
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return false;
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}
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static struct regmap_config sunxi_sid_regmap_config = {
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.reg_bits = 32,
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.val_bits = 8,
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.reg_stride = 1,
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.writeable_reg = sunxi_sid_writeable_reg,
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};
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static int sunxi_sid_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct nvmem_device *nvmem;
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struct regmap *regmap;
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struct sunxi_sid *sid;
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int i, size;
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char *randomness;
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sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);
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if (!sid)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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sid->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(sid->base))
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return PTR_ERR(sid->base);
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size = resource_size(res) - 1;
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sunxi_sid_regmap_config.max_register = size;
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regmap = devm_regmap_init(dev, &sunxi_sid_bus, sid,
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&sunxi_sid_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(dev, "regmap init failed\n");
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return PTR_ERR(regmap);
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}
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econfig.dev = dev;
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nvmem = nvmem_register(&econfig);
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if (IS_ERR(nvmem))
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return PTR_ERR(nvmem);
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randomness = kzalloc(sizeof(u8) * size, GFP_KERNEL);
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for (i = 0; i < size; i++)
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randomness[i] = sunxi_sid_read_byte(sid, i);
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add_device_randomness(randomness, size);
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kfree(randomness);
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platform_set_drvdata(pdev, nvmem);
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return 0;
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}
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static int sunxi_sid_remove(struct platform_device *pdev)
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{
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struct nvmem_device *nvmem = platform_get_drvdata(pdev);
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return nvmem_unregister(nvmem);
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}
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static const struct of_device_id sunxi_sid_of_match[] = {
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{ .compatible = "allwinner,sun4i-a10-sid" },
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{ .compatible = "allwinner,sun7i-a20-sid" },
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, sunxi_sid_of_match);
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static struct platform_driver sunxi_sid_driver = {
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.probe = sunxi_sid_probe,
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.remove = sunxi_sid_remove,
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.driver = {
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.name = "eeprom-sunxi-sid",
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.of_match_table = sunxi_sid_of_match,
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},
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};
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module_platform_driver(sunxi_sid_driver);
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MODULE_AUTHOR("Oliver Schinagl <oliver@schinagl.nl>");
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MODULE_DESCRIPTION("Allwinner sunxi security id driver");
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MODULE_LICENSE("GPL");
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