diff options
Diffstat (limited to 'drivers/uio')
| -rw-r--r-- | drivers/uio/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/uio/Makefile | 1 | ||||
| -rw-r--r-- | drivers/uio/uio_smx.c | 140 |
3 files changed, 154 insertions, 0 deletions
diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig index d8ab7e668bd..a4aaab9c7dd 100644 --- a/drivers/uio/Kconfig +++ b/drivers/uio/Kconfig @@ -26,4 +26,17 @@ 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. + endif diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile index 7fecfb459da..18c45662431 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 00000000000..44054a650a8 --- /dev/null +++ b/drivers/uio/uio_smx.c @@ -0,0 +1,140 @@ +/* + * 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 <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@niasdigital.com>"); |