Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753449AbYCMJaW (ORCPT ); Thu, 13 Mar 2008 05:30:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751293AbYCMJaL (ORCPT ); Thu, 13 Mar 2008 05:30:11 -0400 Received: from outbound.icp-qv1-irony-out4.iinet.net.au ([203.59.1.150]:28182 "EHLO outbound.icp-qv1-irony-out4.iinet.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750807AbYCMJaJ (ORCPT ); Thu, 13 Mar 2008 05:30:09 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqABADOR2Ed8qMER/2dsb2JhbAAIpmmCCA X-IronPort-AV: E=Sophos;i="4.25,493,1199631600"; d="scan'208";a="191995817" Subject: [PATCH v3] UIO: Implement a UIO interface for the SMX Cryptengine From: Ben Nizette To: =?ISO-8859-1?Q?Hans-J=FCrgen?= Koch Cc: gregkh , linux-kernel , Paul Mundt Content-Type: text/plain; charset=UTF-8 Organization: Nias Digital Date: Thu, 13 Mar 2008 20:35:40 +1100 Message-Id: <1205400940.3735.15.camel@moss.renham> Mime-Version: 1.0 X-Mailer: Evolution 2.12.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5602 Lines: 202 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 --- 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@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..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 + * + * 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 +#include +#include +#include + +#include + +#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)) + 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 "); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/