Date:	Thu, 13 Mar 2008 15:31:25 +0100
From:	Hans-Jürgen Koch <hjk@...utronix.de>
To:	Ben Nizette <bn@...sdigital.com>
Cc:	Paul Mundt <lethal@...ux-sh.org>, gregkh <gregkh@...e.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] UIO: Implement a UIO interface for the SMX
 Cryptengine

Am Thu, 13 Mar 2008 22:27:30 +1100
schrieb Ben Nizette <bn@...sdigital.com>:

Hi Ben,

> This patch implements a UIO interface for the SMX Cryptengine.

Thanks for fixing the issues mentioned. Looks alright to me now.

> 
> 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.  :-)
> 
> This is version 4 of this patch and addresses all issues raised by
> Hans-Jürgen Koch and Paul Mundt in their reviews.  Slightly altered
> is Paul's suggestion to use DRV_NAME and DRV_VERSION as the UIO
> version and name.  While at the moment they are the same, there
> is no reason for them to stay that way.  Nevertheless we now at
> least provide a MODULE_VERSION macro to keep modinfo happy.
> 
> Signed-off-by: Ben Nizette <bn@...sdigital.com>

Signed-off-by: Hans J Koch <hjk@...utronix.de>

> ---
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2cdb591..480fd44 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -3554,6 +3554,11 @@ M:	mhoffman@...htlink.com
>  L:	lm-sensors@...sensors.org
>  S:	Maintained
>  
> +SMX UIO Interface
> +P:	Ben Nizette
> +M:	bn@...sdigital.com
> +S:	Maintained
> +
>  SOFTMAC LAYER (IEEE 802.11)
>  P:	Daniel Drake
>  M:	dsd@...too.org
> diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
> index b778ed7..f57b347 100644
> --- a/drivers/uio/Kconfig
> +++ b/drivers/uio/Kconfig
> @@ -26,4 +26,16 @@ 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.  These will be available from Q4 2008
> +	  from http://www.niasdigital.com.  The userspace part of this
> +	  driver will be released under the GPL at the same time as the
> +	  hardware and will be able to be downloaded from the same site.
> +
> +	  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..44054a6
> --- /dev/null
> +++ b/drivers/uio/uio_smx.c
> @@ -0,0 +1,140 @@
> +/*
> + * UIO SMX Cryptengine driver.
> + *
> + * (C) 2008 Nias Digital P/L <bn@...sdigital.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 <linux/io.h>
> +
> +#define DRV_NAME "smx-ce"
> +#define DRV_VERSION "0.03"
> +
> +#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);
> +
> +	if (!(status & SMX_DRDY))
> +		return IRQ_NONE;
> +
> +	/* Disable interrupt */
> +	iowrite32(status & ~SMX_DRDY, csr);
> +	return IRQ_HANDLED;
> +}
> +
> +static int __devinit smx_ce_probe(struct platform_device *dev)
> +{
> +
> +	int ret = -ENODEV;
> +	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) {
> +		dev_err(&dev->dev, "No memory resource specified\n");
> +		goto out_free;
> +	}
> +
> +	info->mem[0].addr = regs->start;
> +	if (!info->mem[0].addr) {
> +		dev_err(&dev->dev, "Invalid memory resource\n");
> +		goto out_free;
> +	}
> +
> +	info->mem[0].size = regs->end - regs->start + 1;
> +	info->mem[0].internal_addr = ioremap(regs->start, info->mem[0].size);
> +
> +	if (!info->mem[0].internal_addr) {
> +		dev_err(&dev->dev, "Can't remap memory address range\n");
> +		goto out_free;
> +	}
> +
> +	info->mem[0].memtype = UIO_MEM_PHYS;
> +
> +	info->name = "smx-ce";
> +	info->version = "0.03";
> +
> +	info->irq = platform_get_irq(dev, 0);
> +	if (info->irq < 0) {
> +		ret = info->irq;
> +		dev_err(&dev->dev, "No (or invalid) IRQ resource specified\n");
> +		goto out_unmap;
> +	}
> +
> +	info->irq_flags = IRQF_SHARED;
> +	info->handler = smx_handler;
> +
> +	platform_set_drvdata(dev, info);
> +
> +	ret = uio_register_device(&dev->dev, info);
> +
> +	if (ret)
> +		goto out_unmap;
> +
> +	return 0;
> +
> +out_unmap:
> +	iounmap(info->mem[0].internal_addr);
> +out_free:
> +	kfree(info);
> +
> +	return ret;
> +}
> +
> +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	= DRV_NAME,
> +		.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_VERSION(DRV_VERSION);
> +MODULE_AUTHOR("Ben Nizette <bn@...sdigital.com>");
> 
> --
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