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Subject[PATCH 1/1] drivers/misc: Add Altera System ID driver
Date
This patch is to add Altera System ID driver.
User can obtain the system ID and timestamp of the system by
reading the sysfs entry.

Usage:
cat /sys/bus/platform/devices/[addr].sysid/sysid/id
cat /sys/bus/platform/devices/[addr].sysid/sysid/timestamp

Signed-off-by: Ley Foon Tan <lftan@altera.com>
---
.../devicetree/bindings/misc/altera_sysid.txt | 18 +++
drivers/misc/Kconfig | 6 +
drivers/misc/Makefile | 3 +-
drivers/misc/altera_sysid.c | 142 ++++++++++++++++++++
4 files changed, 168 insertions(+), 1 deletions(-)
create mode 100644 Documentation/devicetree/bindings/misc/altera_sysid.txt
create mode 100644 drivers/misc/altera_sysid.c

diff --git a/Documentation/devicetree/bindings/misc/altera_sysid.txt b/Documentation/devicetree/bindings/misc/altera_sysid.txt
new file mode 100644
index 0000000..463dc15
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/altera_sysid.txt
@@ -0,0 +1,18 @@
+Altera Sysid IP core driver
+
+Required properties:
+- compatible: altr,sysid-1.0
+
+Optional properties:
+- id: A unique 32-bit value that is based on the contents of the system.
+- timestamp: A unique 32-bit value that is based on the system generation time.
+
+Example:
+
+sysid_qsys: sysid@0x10000 {
+ compatible = "altr,sysid-1.0";
+ reg = < 0x10000 0x00000008 >;
+ id = < 1 >;
+ timestamp = < 1359538782 >;
+};
+
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index e83fdfe..0e783af 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -510,6 +510,12 @@ config LATTICE_ECP3_CONFIG

If unsure, say N.

+config ALTERA_SYSID
+ tristate "Altera System ID"
+ help
+ This enables Altera System ID soft core driver.
+
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 35a1463..dc7142d 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -47,7 +47,8 @@ obj-y += ti-st/
obj-y += lis3lv02d/
obj-y += carma/
obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
-obj-$(CONFIG_ALTERA_STAPL) +=altera-stapl/
+obj-$(CONFIG_ALTERA_STAPL) += altera-stapl/
+obj-$(CONFIG_ALTERA_SYSID) += altera_sysid.o
obj-$(CONFIG_INTEL_MEI) += mei/
obj-$(CONFIG_MAX8997_MUIC) += max8997-muic.o
obj-$(CONFIG_VMWARE_VMCI) += vmw_vmci/
diff --git a/drivers/misc/altera_sysid.c b/drivers/misc/altera_sysid.c
new file mode 100644
index 0000000..7472a4b
--- /dev/null
+++ b/drivers/misc/altera_sysid.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2013 Altera Corporation
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Credit:
+ * Walter Goossens
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#define DRV_NAME "altera_sysid"
+
+struct altera_sysid {
+ void __iomem *regs;
+};
+
+/* System ID Registers*/
+#define SYSID_REG_ID (0x0)
+#define SYSID_REG_TIMESTAMP (0x4)
+
+static ssize_t altera_sysid_show_id(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct altera_sysid *sysid = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", readl(sysid->regs + SYSID_REG_ID));
+}
+
+static ssize_t altera_sysid_show_timestamp(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned int reg;
+ struct tm timestamp;
+ struct altera_sysid *sysid = dev_get_drvdata(dev);
+
+ reg = readl(sysid->regs + SYSID_REG_TIMESTAMP);
+
+ time_to_tm(reg, 0, &timestamp);
+
+ return sprintf(buf, "%u (%u-%u-%u %u:%u:%u UTC)\n", reg,
+ (unsigned int)(timestamp.tm_year + 1900),
+ timestamp.tm_mon + 1, timestamp.tm_mday, timestamp.tm_hour,
+ timestamp.tm_min, timestamp.tm_sec);
+}
+
+static DEVICE_ATTR(id, S_IRUGO, altera_sysid_show_id, NULL);
+static DEVICE_ATTR(timestamp, S_IRUGO, altera_sysid_show_timestamp, NULL);
+
+static struct attribute *altera_sysid_attrs[] = {
+ &dev_attr_id.attr,
+ &dev_attr_timestamp.attr,
+ NULL,
+};
+
+struct attribute_group altera_sysid_attr_group = {
+ .name = "sysid",
+ .attrs = altera_sysid_attrs,
+};
+
+static int altera_sysid_probe(struct platform_device *pdev)
+{
+ struct altera_sysid *sysid;
+ struct resource *regs;
+
+ sysid = devm_kzalloc(&pdev->dev, sizeof(struct altera_sysid),
+ GFP_KERNEL);
+ if (!sysid)
+ return -ENOMEM;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs)
+ return -ENXIO;
+
+ sysid->regs = devm_request_and_ioremap(&pdev->dev, regs);
+ if (!sysid->regs)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, sysid);
+
+ return sysfs_create_group(&pdev->dev.kobj, &altera_sysid_attr_group);
+}
+
+static int __exit altera_sysid_remove(struct platform_device *pdev)
+{
+ sysfs_remove_group(&pdev->dev.kobj, &altera_sysid_attr_group);
+
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static const struct of_device_id altera_sysid_match[] = {
+ { .compatible = "altr,sysid-1.0" },
+ { /* Sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, altera_sysid_match);
+
+static struct platform_driver altera_sysid_platform_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = altera_sysid_match,
+ },
+ .remove = __exit_p(altera_sysid_remove),
+};
+
+static int __init altera_sysid_init(void)
+{
+ return platform_driver_probe(&altera_sysid_platform_driver,
+ altera_sysid_probe);
+}
+
+static void __exit altera_sysid_exit(void)
+{
+ platform_driver_unregister(&altera_sysid_platform_driver);
+}
+
+module_init(altera_sysid_init);
+module_exit(altera_sysid_exit);
+
+MODULE_AUTHOR("Ley Foon Tan");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Altera System ID driver");
+MODULE_ALIAS("platform:" DRV_NAME);
--
1.7.7.4



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