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Message-ID: <20080313110903.206f417b@dilbert.local>
Date: Thu, 13 Mar 2008 11:09:03 +0100
From: Hans-Jürgen Koch <hjk@...utronix.de>
To: Ben Nizette <bn@...sdigital.com>
Cc: gregkh <gregkh@...e.de>,
linux-kernel <linux-kernel@...r.kernel.org>,
Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH v3] UIO: Implement a UIO interface for the SMX
Cryptengine
Am Thu, 13 Mar 2008 20:35:40 +1100
schrieb Ben Nizette <bn@...sdigital.com>:
Ben,
sorry, but your code doesn't compile. See below.
Thanks,
Hans
> 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. :-)
>
> This is version 2 of this patch and addresses all issues raised by
> Hans-Jürgen Koch and Paul Mundt in their reviews.
>
> Signed-off-by: Ben Nizette <bn@...sdigital.com>
> ---
> Apologies for the confusion around this patch, I didn't mean to give the
> impression that I'd ignored Paul; I am of course grateful for his review
> and bug catch. I received the review just a minute after sending out
> the last version, made the change locally but didn't immediately resend.
> I'll know better next time.
>
> 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..fda8b8b
> --- /dev/null
> +++ b/drivers/uio/uio_smx.c
> @@ -0,0 +1,118 @@
> +/*
> + * 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 <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);
> +
> + if (!(csr & SMX_DRDY))
This doesn't compile.
> + return IRQ_NONE;
> +
> + /* Disable interrupt */
> + iowrite32(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].size = regs->end - regs->start + 1;
> + info->mem[0].internal_addr = ioremap(regs->start, info->mem[0].size);
> + if (!info->mem[0].internal_addr)
> + 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);
> + info->irq_flags = IRQF_SHARED;
> + 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@...sdigital.com>");
>
--
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