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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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141 lines
2.9 KiB
C
141 lines
2.9 KiB
C
![]() |
/*
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* UIO SMX Cryptengine driver.
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*
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* (C) 2008 Nias Digital P/L <bn@niasdigital.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/uio_driver.h>
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#include <linux/io.h>
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#define DRV_NAME "smx-ce"
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#define DRV_VERSION "0.03"
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#define SMX_CSR 0x00000000
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#define SMX_EnD 0x00000001
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#define SMX_RUN 0x00000002
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#define SMX_DRDY 0x00000004
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#define SMX_ERR 0x00000008
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static irqreturn_t smx_handler(int irq, struct uio_info *dev_info)
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{
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void __iomem *csr = dev_info->mem[0].internal_addr + SMX_CSR;
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u32 status = ioread32(csr);
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if (!(status & SMX_DRDY))
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return IRQ_NONE;
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/* Disable interrupt */
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iowrite32(status & ~SMX_DRDY, csr);
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return IRQ_HANDLED;
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}
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static int __devinit smx_ce_probe(struct platform_device *dev)
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{
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int ret = -ENODEV;
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struct uio_info *info;
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struct resource *regs;
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info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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regs = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (!regs) {
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dev_err(&dev->dev, "No memory resource specified\n");
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goto out_free;
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}
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info->mem[0].addr = regs->start;
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if (!info->mem[0].addr) {
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dev_err(&dev->dev, "Invalid memory resource\n");
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goto out_free;
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}
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info->mem[0].size = regs->end - regs->start + 1;
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info->mem[0].internal_addr = ioremap(regs->start, info->mem[0].size);
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if (!info->mem[0].internal_addr) {
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dev_err(&dev->dev, "Can't remap memory address range\n");
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goto out_free;
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}
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info->mem[0].memtype = UIO_MEM_PHYS;
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info->name = "smx-ce";
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info->version = "0.03";
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info->irq = platform_get_irq(dev, 0);
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if (info->irq < 0) {
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ret = info->irq;
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dev_err(&dev->dev, "No (or invalid) IRQ resource specified\n");
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goto out_unmap;
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}
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info->irq_flags = IRQF_SHARED;
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info->handler = smx_handler;
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platform_set_drvdata(dev, info);
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ret = uio_register_device(&dev->dev, info);
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if (ret)
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goto out_unmap;
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return 0;
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out_unmap:
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iounmap(info->mem[0].internal_addr);
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out_free:
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kfree(info);
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return ret;
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}
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static int __devexit smx_ce_remove(struct platform_device *dev)
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{
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struct uio_info *info = platform_get_drvdata(dev);
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uio_unregister_device(info);
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platform_set_drvdata(dev, NULL);
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iounmap(info->mem[0].internal_addr);
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kfree(info);
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return 0;
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}
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static struct platform_driver smx_ce_driver = {
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.probe = smx_ce_probe,
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.remove = __devexit_p(smx_ce_remove),
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init smx_ce_init_module(void)
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{
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return platform_driver_register(&smx_ce_driver);
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}
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module_init(smx_ce_init_module);
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static void __exit smx_ce_exit_module(void)
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{
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platform_driver_unregister(&smx_ce_driver);
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}
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module_exit(smx_ce_exit_module);
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MODULE_LICENSE("GPL v2");
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MODULE_VERSION(DRV_VERSION);
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MODULE_AUTHOR("Ben Nizette <bn@niasdigital.com>");
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