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path: root/drivers/uio/uio_smx.c
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Diffstat (limited to 'drivers/uio/uio_smx.c')
-rw-r--r--drivers/uio/uio_smx.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/uio/uio_smx.c b/drivers/uio/uio_smx.c
new file mode 100644
index 0000000..44054a6
--- /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>");
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