[PATCH] UIO: Implement a UIO interface for the SMX Cryptengine

Ben Nizette
2008-03-11T05:02:18Z

This patch implements a UIO interface for the SMX Cryptengine.

The Cryptengine found on the Nias Digital SMX board is best suited
for a UIO interface. It is not wired in to the cryptographic API
as the engine handles it's own keys, algorithms, everything. All
that we know about is that if there's room in the buffer, you can
write data to it and when there's data ready, you read it out again.

There isn't necessarily even any direct correlation between data
going in and data coming out again, the engine may consume or
generate data all on its own.

This driver is for proprietary hardware but we're always told to
submit the drivers anyway; here you are. :-)

Signed-Off-By: Ben Nizette <bn@niasdigital.com>
---
diff --git a/MAINTAINERS b/MAINTAINERS
index 2cdb591..480fd44 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3554,6 +3554,11 @@ M: mhoffman@lightlink.com
L: lm-sensors@lm-sensors.org
S: Maintained

+SMX UIO Interface
+P: Ben Nizette
+M: bn@niasdigital.com
+S: Maintained
+
SOFTMAC LAYER (IEEE 802.11)
P: Daniel Drake
M: dsd@gentoo.org
diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
index b778ed7..e1ab43b 100644
--- a/drivers/uio/Kconfig
+++ b/drivers/uio/Kconfig
@@ -26,4 +26,12 @@ config UIO_CIF
To compile this driver as a module, choose M here: the module
will be called uio_cif.

+config UIO_SMX
+ tristate "SMX cryptengine UIO interface"
+ depends on UIO
+ default n
+ help
+ Userspace IO interface to the Cryptography engine found on the
+ Nias Digital SMX boards. If you compile this as a module, it
+ will be called uio_smx.
endmenu
diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile
index 7fecfb4..18c4566 100644
--- a/drivers/uio/Makefile
+++ b/drivers/uio/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_UIO) += uio.o
obj-$(CONFIG_UIO_CIF) += uio_cif.o
+obj-$(CONFIG_UIO_SMX) += uio_smx.o
diff --git a/drivers/uio/uio_smx.c b/drivers/uio/uio_smx.c
new file mode 100644
index 0000000..e56b37d
--- /dev/null
+++ b/drivers/uio/uio_smx.c
@@ -0,0 +1,114 @@
+/*
+ * UIO SMX Cryptengine driver.
+ *
+ * (C) 2008 Nias Digital P/L <bn@niasdigital.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/uio_driver.h>
+
+#include <asm/io.h>
+
+#define SMX_CSR 0x00000000
+#define SMX_EnD 0x00000001
+#define SMX_RUN 0x00000002
+#define SMX_DRDY 0x00000004
+#define SMX_ERR 0x00000008
+
+static irqreturn_t smx_handler(int irq, struct uio_info *dev_info)
+{
+ void __iomem *csr = dev_info->mem[0].internal_addr + SMX_CSR;
+
+ u32 status = ioread32(csr);
+
+ /* Disable interrupt */
+ iowrite8(status & ~SMX_DRDY, csr);
+ return IRQ_HANDLED;
+}
+
+static int __devinit smx_ce_probe(struct platform_device *dev)
+{
+ struct uio_info *info;
+ struct resource *regs;
+
+ info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ regs = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ if (!regs)
+ goto out_free;
+
+ info->mem[0].addr = regs->start;
+ if (!info->mem[0].addr)
+ goto out_free;
+ info->mem[0].internal_addr = ioremap(regs->start, regs->end -
regs->start);
+ if (!info->mem[0].internal_addr)
+ goto out_free;
+
+ info->mem[0].size = regs->end - regs->start;
+ info->mem[0].memtype = UIO_MEM_PHYS;
+
+ info->name = "smx-ce";
+ info->version = "0.03";
+ info->irq = platform_get_irq(dev, 0);
+ info->irq_flags = 0;
+ info->handler = smx_handler;
+
+ platform_set_drvdata(dev, info);
+
+ if (uio_register_device(&dev->dev, info))
+ goto out_unmap;
+
+ return 0;
+out_unmap:
+ iounmap(info->mem[0].internal_addr);
+out_free:
+ kfree(info);
+
+ return -ENODEV;
+}
+
+static int __devexit smx_ce_remove(struct platform_device *dev)
+{
+ struct uio_info *info = platform_get_drvdata(dev);
+
+ uio_unregister_device(info);
+ platform_set_drvdata(dev, NULL);
+ iounmap(info->mem[0].internal_addr);
+
+ kfree (info);
+
+ return 0;
+}
+
+static struct platform_driver smx_ce_driver = {
+ .probe = smx_ce_probe,
+ .remove = __devexit_p(smx_ce_remove),
+ .driver = {
+ .name = "smx-ce",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init smx_ce_init_module(void)
+{
+ return platform_driver_register(&smx_ce_driver);
+}
+module_init(smx_ce_init_module);
+
+static void __exit smx_ce_exit_module(void)
+{
+ platform_driver_unregister(&smx_ce_driver);
+}
+module_exit(smx_ce_exit_module);
+
+MODULE_LICENSE("GPL V2");
+MODULE_AUTHOR("Ben Nizette <bn@niasdigital.com>");