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/*
* 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>");
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