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drivers/uio/uio_smx.c
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b54f2863a UIO: Implement a ... |
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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 "); goto out_free; } info->mem[0].addr = regs->start; if (!info->mem[0].addr) { dev_err(&dev->dev, "Invalid memory resource "); 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 "); 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 "); 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>"); |