1 files changed, 230 insertions, 0 deletions

diff --git a/drivers/crypto/ccp/ccp-platform.c b/drivers/crypto/ccp/ccp-platform.c
new file mode 100644
index 000000000000..b0a2806908f1
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-platform.c
@@ -0,0 +1,230 @@
+/*
+ * AMD Cryptographic Coprocessor (CCP) driver
+ *
+ * Copyright (C) 2014 Advanced Micro Devices, Inc.
+ *
+ * Author: Tom Lendacky <thomas.lendacky@amd.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/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/ioport.h>
+#include <linux/dma-mapping.h>
+#include <linux/kthread.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/ccp.h>
+#include <linux/of.h>
+
+#include "ccp-dev.h"
+
+
+static int ccp_get_irq(struct ccp_device *ccp)
+{
+        struct device *dev = ccp->dev;
+        struct platform_device *pdev = container_of(dev,
+                                        struct platform_device, dev);
+        int ret;
+
+        ret = platform_get_irq(pdev, 0);
+        if (ret < 0)
+                return ret;
+
+        ccp->irq = ret;
+        ret = request_irq(ccp->irq, ccp_irq_handler, 0, "ccp", dev);
+        if (ret) {
+                dev_notice(dev, "unable to allocate IRQ (%d)\n", ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+static int ccp_get_irqs(struct ccp_device *ccp)
+{
+        struct device *dev = ccp->dev;
+        int ret;
+
+        ret = ccp_get_irq(ccp);
+        if (!ret)
+                return 0;
+
+        /* Couldn't get an interrupt */
+        dev_notice(dev, "could not enable interrupts (%d)\n", ret);
+
+        return ret;
+}
+
+static void ccp_free_irqs(struct ccp_device *ccp)
+{
+        struct device *dev = ccp->dev;
+
+        free_irq(ccp->irq, dev);
+}
+
+static struct resource *ccp_find_mmio_area(struct ccp_device *ccp)
+{
+        struct device *dev = ccp->dev;
+        struct platform_device *pdev = container_of(dev,
+                                        struct platform_device, dev);
+        struct resource *ior;
+
+        ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (ior && (resource_size(ior) >= 0x800))
+                return ior;
+
+        return NULL;
+}
+
+static int ccp_platform_probe(struct platform_device *pdev)
+{
+        struct ccp_device *ccp;
+        struct device *dev = &pdev->dev;
+        struct resource *ior;
+        int ret;
+
+        ret = -ENOMEM;
+        ccp = ccp_alloc_struct(dev);
+        if (!ccp)
+                goto e_err;
+
+        ccp->dev_specific = NULL;
+        ccp->get_irq = ccp_get_irqs;
+        ccp->free_irq = ccp_free_irqs;
+
+        ior = ccp_find_mmio_area(ccp);
+        ccp->io_map = devm_ioremap_resource(dev, ior);
+        if (IS_ERR(ccp->io_map)) {
+                ret = PTR_ERR(ccp->io_map);
+                goto e_free;
+        }
+        ccp->io_regs = ccp->io_map;
+
+        if (!dev->dma_mask)
+                dev->dma_mask = &dev->coherent_dma_mask;
+        *(dev->dma_mask) = DMA_BIT_MASK(48);
+        dev->coherent_dma_mask = DMA_BIT_MASK(48);
+
+        if (of_property_read_bool(dev->of_node, "dma-coherent"))
+                ccp->axcache = CACHE_WB_NO_ALLOC;
+        else
+                ccp->axcache = CACHE_NONE;
+
+        dev_set_drvdata(dev, ccp);
+
+        ret = ccp_init(ccp);
+        if (ret)
+                goto e_free;
+
+        dev_notice(dev, "enabled\n");
+
+        return 0;
+
+e_free:
+        kfree(ccp);
+
+e_err:
+        dev_notice(dev, "initialization failed\n");
+        return ret;
+}
+
+static int ccp_platform_remove(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct ccp_device *ccp = dev_get_drvdata(dev);
+
+        ccp_destroy(ccp);
+
+        kfree(ccp);
+
+        dev_notice(dev, "disabled\n");
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int ccp_platform_suspend(struct platform_device *pdev,
+                                pm_message_t state)
+{
+        struct device *dev = &pdev->dev;
+        struct ccp_device *ccp = dev_get_drvdata(dev);
+        unsigned long flags;
+        unsigned int i;
+
+        spin_lock_irqsave(&ccp->cmd_lock, flags);
+
+        ccp->suspending = 1;
+
+        /* Wake all the queue kthreads to prepare for suspend */
+        for (i = 0; i < ccp->cmd_q_count; i++)
+                wake_up_process(ccp->cmd_q[i].kthread);
+
+        spin_unlock_irqrestore(&ccp->cmd_lock, flags);
+
+        /* Wait for all queue kthreads to say they're done */
+        while (!ccp_queues_suspended(ccp))
+                wait_event_interruptible(ccp->suspend_queue,
+                                         ccp_queues_suspended(ccp));
+
+        return 0;
+}
+
+static int ccp_platform_resume(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct ccp_device *ccp = dev_get_drvdata(dev);
+        unsigned long flags;
+        unsigned int i;
+
+        spin_lock_irqsave(&ccp->cmd_lock, flags);
+
+        ccp->suspending = 0;
+
+        /* Wake up all the kthreads */
+        for (i = 0; i < ccp->cmd_q_count; i++) {
+                ccp->cmd_q[i].suspended = 0;
+                wake_up_process(ccp->cmd_q[i].kthread);
+        }
+
+        spin_unlock_irqrestore(&ccp->cmd_lock, flags);
+
+        return 0;
+}
+#endif
+
+static const struct of_device_id ccp_platform_ids[] = {
+        { .compatible = "amd,ccp-seattle-v1a" },
+        { },
+};
+
+static struct platform_driver ccp_platform_driver = {
+        .driver = {
+                .name = "AMD Cryptographic Coprocessor",
+                .owner = THIS_MODULE,
+                .of_match_table = ccp_platform_ids,
+        },
+        .probe = ccp_platform_probe,
+        .remove = ccp_platform_remove,
+#ifdef CONFIG_PM
+        .suspend = ccp_platform_suspend,
+        .resume = ccp_platform_resume,
+#endif
+};
+
+int ccp_platform_init(void)
+{
+        return platform_driver_register(&ccp_platform_driver);
+}
+
+void ccp_platform_exit(void)
+{
+        platform_driver_unregister(&ccp_platform_driver);
+}