crypto: ccp - CCP device driver and interface support

These routines provide the device driver support for the AMD
Cryptographic Coprocessor (CCP).

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 360 insertions, 0 deletions

diff --git a/drivers/crypto/ccp/ccp-pci.c b/drivers/crypto/ccp/ccp-pci.c
new file mode 100644
index 000000000000..1fbeaf1856a8
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-pci.c
@@ -0,0 +1,360 @@
+/*
+ * AMD Cryptographic Coprocessor (CCP) driver
+ *
+ * Copyright (C) 2013 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/pci.h>
+#include <linux/pci_ids.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 "ccp-dev.h"
+
+#define IO_BAR				2
+#define MSIX_VECTORS			2
+
+struct ccp_msix {
+	u32 vector;
+	char name[16];
+};
+
+struct ccp_pci {
+	int msix_count;
+	struct ccp_msix msix[MSIX_VECTORS];
+};
+
+static int ccp_get_msix_irqs(struct ccp_device *ccp)
+{
+	struct ccp_pci *ccp_pci = ccp->dev_specific;
+	struct device *dev = ccp->dev;
+	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
+	struct msix_entry msix_entry[MSIX_VECTORS];
+	unsigned int name_len = sizeof(ccp_pci->msix[0].name) - 1;
+	int v, ret;
+
+	for (v = 0; v < ARRAY_SIZE(msix_entry); v++)
+		msix_entry[v].entry = v;
+
+	while ((ret = pci_enable_msix(pdev, msix_entry, v)) > 0)
+		v = ret;
+	if (ret)
+		return ret;
+
+	ccp_pci->msix_count = v;
+	for (v = 0; v < ccp_pci->msix_count; v++) {
+		/* Set the interrupt names and request the irqs */
+		snprintf(ccp_pci->msix[v].name, name_len, "ccp-%u", v);
+		ccp_pci->msix[v].vector = msix_entry[v].vector;
+		ret = request_irq(ccp_pci->msix[v].vector, ccp_irq_handler,
+				  0, ccp_pci->msix[v].name, dev);
+		if (ret) {
+			dev_notice(dev, "unable to allocate MSI-X IRQ (%d)\n",
+				   ret);
+			goto e_irq;
+		}
+	}
+
+	return 0;
+
+e_irq:
+	while (v--)
+		free_irq(ccp_pci->msix[v].vector, dev);
+
+	pci_disable_msix(pdev);
+
+	ccp_pci->msix_count = 0;
+
+	return ret;
+}
+
+static int ccp_get_msi_irq(struct ccp_device *ccp)
+{
+	struct device *dev = ccp->dev;
+	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
+	int ret;
+
+	ret = pci_enable_msi(pdev);
+	if (ret)
+		return ret;
+
+	ret = request_irq(pdev->irq, ccp_irq_handler, 0, "ccp", dev);
+	if (ret) {
+		dev_notice(dev, "unable to allocate MSI IRQ (%d)\n", ret);
+		goto e_msi;
+	}
+
+	return 0;
+
+e_msi:
+	pci_disable_msi(pdev);
+
+	return ret;
+}
+
+static int ccp_get_irqs(struct ccp_device *ccp)
+{
+	struct device *dev = ccp->dev;
+	int ret;
+
+	ret = ccp_get_msix_irqs(ccp);
+	if (!ret)
+		return 0;
+
+	/* Couldn't get MSI-X vectors, try MSI */
+	dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
+	ret = ccp_get_msi_irq(ccp);
+	if (!ret)
+		return 0;
+
+	/* Couldn't get MSI interrupt */
+	dev_notice(dev, "could not enable MSI (%d)\n", ret);
+
+	return ret;
+}
+
+static void ccp_free_irqs(struct ccp_device *ccp)
+{
+	struct ccp_pci *ccp_pci = ccp->dev_specific;
+	struct device *dev = ccp->dev;
+	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
+
+	if (ccp_pci->msix_count) {
+		while (ccp_pci->msix_count--)
+			free_irq(ccp_pci->msix[ccp_pci->msix_count].vector,
+				 dev);
+		pci_disable_msix(pdev);
+	} else {
+		free_irq(pdev->irq, dev);
+		pci_disable_msi(pdev);
+	}
+}
+
+static int ccp_find_mmio_area(struct ccp_device *ccp)
+{
+	struct device *dev = ccp->dev;
+	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
+	resource_size_t io_len;
+	unsigned long io_flags;
+	int bar;
+
+	io_flags = pci_resource_flags(pdev, IO_BAR);
+	io_len = pci_resource_len(pdev, IO_BAR);
+	if ((io_flags & IORESOURCE_MEM) && (io_len >= (IO_OFFSET + 0x800)))
+		return IO_BAR;
+
+	for (bar = 0; bar < PCI_STD_RESOURCE_END; bar++) {
+		io_flags = pci_resource_flags(pdev, bar);
+		io_len = pci_resource_len(pdev, bar);
+		if ((io_flags & IORESOURCE_MEM) &&
+		    (io_len >= (IO_OFFSET + 0x800)))
+			return bar;
+	}
+
+	return -EIO;
+}
+
+static int ccp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct ccp_device *ccp;
+	struct ccp_pci *ccp_pci;
+	struct device *dev = &pdev->dev;
+	unsigned int bar;
+	int ret;
+
+	ret = -ENOMEM;
+	ccp = ccp_alloc_struct(dev);
+	if (!ccp)
+		goto e_err;
+
+	ccp_pci = kzalloc(sizeof(*ccp_pci), GFP_KERNEL);
+	if (!ccp_pci) {
+		ret = -ENOMEM;
+		goto e_free1;
+	}
+	ccp->dev_specific = ccp_pci;
+	ccp->get_irq = ccp_get_irqs;
+	ccp->free_irq = ccp_free_irqs;
+
+	ret = pci_request_regions(pdev, "ccp");
+	if (ret) {
+		dev_err(dev, "pci_request_regions failed (%d)\n", ret);
+		goto e_free2;
+	}
+
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		dev_err(dev, "pci_enable_device failed (%d)\n", ret);
+		goto e_regions;
+	}
+
+	pci_set_master(pdev);
+
+	ret = ccp_find_mmio_area(ccp);
+	if (ret < 0)
+		goto e_device;
+	bar = ret;
+
+	ret = -EIO;
+	ccp->io_map = pci_iomap(pdev, bar, 0);
+	if (ccp->io_map == NULL) {
+		dev_err(dev, "pci_iomap failed\n");
+		goto e_device;
+	}
+	ccp->io_regs = ccp->io_map + IO_OFFSET;
+
+	ret = dma_set_mask(dev, DMA_BIT_MASK(48));
+	if (ret == 0) {
+		ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(48));
+		if (ret) {
+			dev_err(dev,
+				"pci_set_consistent_dma_mask failed (%d)\n",
+				ret);
+			goto e_bar0;
+		}
+	} else {
+		ret = dma_set_mask(dev, DMA_BIT_MASK(32));
+		if (ret) {
+			dev_err(dev, "pci_set_dma_mask failed (%d)\n", ret);
+			goto e_bar0;
+		}
+	}
+
+	dev_set_drvdata(dev, ccp);
+
+	ret = ccp_init(ccp);
+	if (ret)
+		goto e_bar0;
+
+	dev_notice(dev, "enabled\n");
+
+	return 0;
+
+e_bar0:
+	pci_iounmap(pdev, ccp->io_map);
+
+e_device:
+	pci_disable_device(pdev);
+	dev_set_drvdata(dev, NULL);
+
+e_regions:
+	pci_release_regions(pdev);
+
+e_free2:
+	kfree(ccp_pci);
+
+e_free1:
+	kfree(ccp);
+
+e_err:
+	dev_notice(dev, "initialization failed\n");
+	return ret;
+}
+
+static void ccp_pci_remove(struct pci_dev *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ccp_device *ccp = dev_get_drvdata(dev);
+
+	ccp_destroy(ccp);
+
+	pci_iounmap(pdev, ccp->io_map);
+
+	pci_disable_device(pdev);
+	dev_set_drvdata(dev, NULL);
+
+	pci_release_regions(pdev);
+
+	kfree(ccp);
+
+	dev_notice(dev, "disabled\n");
+}
+
+#ifdef CONFIG_PM
+static int ccp_pci_suspend(struct pci_dev *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_pci_resume(struct pci_dev *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 DEFINE_PCI_DEVICE_TABLE(ccp_pci_table) = {
+	{ PCI_VDEVICE(AMD, 0x1537), },
+	/* Last entry must be zero */
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, ccp_pci_table);
+
+static struct pci_driver ccp_pci_driver = {
+	.name = "AMD Cryptographic Coprocessor",
+	.id_table = ccp_pci_table,
+	.probe = ccp_pci_probe,
+	.remove = ccp_pci_remove,
+#ifdef CONFIG_PM
+	.suspend = ccp_pci_suspend,
+	.resume = ccp_pci_resume,
+#endif
+};
+
+int ccp_pci_init(void)
+{
+	return pci_register_driver(&ccp_pci_driver);
+}
+
+void ccp_pci_exit(void)
+{
+	pci_unregister_driver(&ccp_pci_driver);
+}