1 files changed, 314 insertions, 0 deletions

diff --git a/drivers/crypto/ccp/ccp-platform.c b/drivers/crypto/ccp/ccp-platform.c
new file mode 100644
index 000000000..b1c20b2b5
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-platform.c
@@ -0,0 +1,314 @@
+/*
+ * 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 <linux/of_address.h>
+#include <linux/acpi.h>
+
+#include "ccp-dev.h"
+
+struct ccp_platform {
+	int use_acpi;
+	int coherent;
+};
+
+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;
+}
+
+#ifdef CONFIG_ACPI
+static int ccp_acpi_support(struct ccp_device *ccp)
+{
+	struct ccp_platform *ccp_platform = ccp->dev_specific;
+	struct acpi_device *adev = ACPI_COMPANION(ccp->dev);
+	acpi_handle handle;
+	acpi_status status;
+	unsigned long long data;
+	int cca;
+
+	/* Retrieve the device cache coherency value */
+	handle = adev->handle;
+	do {
+		status = acpi_evaluate_integer(handle, "_CCA", NULL, &data);
+		if (!ACPI_FAILURE(status)) {
+			cca = data;
+			break;
+		}
+	} while (!ACPI_FAILURE(status));
+
+	if (ACPI_FAILURE(status)) {
+		dev_err(ccp->dev, "error obtaining acpi coherency value\n");
+		return -EINVAL;
+	}
+
+	ccp_platform->coherent = !!cca;
+
+	return 0;
+}
+#else	/* CONFIG_ACPI */
+static int ccp_acpi_support(struct ccp_device *ccp)
+{
+	return -EINVAL;
+}
+#endif
+
+#ifdef CONFIG_OF
+static int ccp_of_support(struct ccp_device *ccp)
+{
+	struct ccp_platform *ccp_platform = ccp->dev_specific;
+
+	ccp_platform->coherent = of_dma_is_coherent(ccp->dev->of_node);
+
+	return 0;
+}
+#else
+static int ccp_of_support(struct ccp_device *ccp)
+{
+	return -EINVAL;
+}
+#endif
+
+static int ccp_platform_probe(struct platform_device *pdev)
+{
+	struct ccp_device *ccp;
+	struct ccp_platform *ccp_platform;
+	struct device *dev = &pdev->dev;
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+	struct resource *ior;
+	int ret;
+
+	ret = -ENOMEM;
+	ccp = ccp_alloc_struct(dev);
+	if (!ccp)
+		goto e_err;
+
+	ccp_platform = devm_kzalloc(dev, sizeof(*ccp_platform), GFP_KERNEL);
+	if (!ccp_platform)
+		goto e_err;
+
+	ccp->dev_specific = ccp_platform;
+	ccp->get_irq = ccp_get_irqs;
+	ccp->free_irq = ccp_free_irqs;
+
+	ccp_platform->use_acpi = (!adev || acpi_disabled) ? 0 : 1;
+
+	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_err;
+	}
+	ccp->io_regs = ccp->io_map;
+
+	if (!dev->dma_mask)
+		dev->dma_mask = &dev->coherent_dma_mask;
+	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
+	if (ret) {
+		dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
+		goto e_err;
+	}
+
+	if (ccp_platform->use_acpi)
+		ret = ccp_acpi_support(ccp);
+	else
+		ret = ccp_of_support(ccp);
+	if (ret)
+		goto e_err;
+
+	if (ccp_platform->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_err;
+
+	dev_notice(dev, "enabled\n");
+
+	return 0;
+
+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);
+
+	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
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id ccp_acpi_match[] = {
+	{ "AMDI0C00", 0 },
+	{ },
+};
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id ccp_of_match[] = {
+	{ .compatible = "amd,ccp-seattle-v1a" },
+	{ },
+};
+#endif
+
+static struct platform_driver ccp_platform_driver = {
+	.driver = {
+		.name = "AMD Cryptographic Coprocessor",
+#ifdef CONFIG_ACPI
+		.acpi_match_table = ccp_acpi_match,
+#endif
+#ifdef CONFIG_OF
+		.of_match_table = ccp_of_match,
+#endif
+	},
+	.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);
+}