[mirror_ubuntu-zesty-kernel.git] / drivers / crypto / ccp / ccp-pci.c

/*
 * 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/device.h>
#include <linux/pci.h>
#include <linux/pci_ids.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 "ccp-dev.h"

#define IO_BAR				2
#define IO_OFFSET			0x20000

#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;

	ret = pci_enable_msix_range(pdev, msix_entry, 1, v);
	if (ret < 0)
		return ret;

	ccp_pci->msix_count = ret;
	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;

	ccp->irq = pdev->irq;
	ret = request_irq(ccp->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(ccp->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;

	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;

	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_and_coherent(dev, DMA_BIT_MASK(48));
	if (ret) {
		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
		if (ret) {
			dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
				ret);
			goto e_iomap;
		}
	}

	dev_set_drvdata(dev, ccp);

	ret = ccp_init(ccp);
	if (ret)
		goto e_iomap;

	dev_notice(dev, "enabled\n");

	return 0;

e_iomap:
	pci_iounmap(pdev, ccp->io_map);

e_device:
	pci_disable_device(pdev);

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);

	if (!ccp)
		return;

	ccp_destroy(ccp);

	pci_iounmap(pdev, ccp->io_map);

	pci_disable_device(pdev);

	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 const struct pci_device_id 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);
}
Commit	Line	Data
63b94509 TL	1	/*
	2	* AMD Cryptographic Coprocessor (CCP) driver
	3	*
	4	* Copyright (C) 2013 Advanced Micro Devices, Inc.
	5	*
	6	* Author: Tom Lendacky <thomas.lendacky@amd.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/kernel.h>
3d77565b	15	#include <linux/device.h>
63b94509 TL	16	#include <linux/pci.h>
63b94509 TL	17	#include <linux/pci_ids.h>
3d77565b	18	#include <linux/dma-mapping.h>
63b94509 TL	19	#include <linux/kthread.h>
	20	#include <linux/sched.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/spinlock.h>
	23	#include <linux/delay.h>
	24	#include <linux/ccp.h>
	25
	26	#include "ccp-dev.h"
	27
	28	#define IO_BAR 2
3d77565b TL	29	#define IO_OFFSET 0x20000
3d77565b TL	30
63b94509 TL	31	#define MSIX_VECTORS 2
	32
	33	struct ccp_msix {
	34	u32 vector;
	35	char name[16];
	36	};
	37
	38	struct ccp_pci {
	39	int msix_count;
	40	struct ccp_msix msix[MSIX_VECTORS];
	41	};
	42
	43	static int ccp_get_msix_irqs(struct ccp_device *ccp)
	44	{
	45	struct ccp_pci *ccp_pci = ccp->dev_specific;
	46	struct device *dev = ccp->dev;
	47	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	48	struct msix_entry msix_entry[MSIX_VECTORS];
	49	unsigned int name_len = sizeof(ccp_pci->msix[0].name) - 1;
	50	int v, ret;
	51
	52	for (v = 0; v < ARRAY_SIZE(msix_entry); v++)
	53	msix_entry[v].entry = v;
	54
5347ee8e AG	55	ret = pci_enable_msix_range(pdev, msix_entry, 1, v);
5347ee8e AG	56	if (ret < 0)
63b94509 TL	57	return ret;
63b94509 TL	58
5347ee8e	59	ccp_pci->msix_count = ret;
63b94509 TL	60	for (v = 0; v < ccp_pci->msix_count; v++) {
	61	/* Set the interrupt names and request the irqs */
	62	snprintf(ccp_pci->msix[v].name, name_len, "ccp-%u", v);
	63	ccp_pci->msix[v].vector = msix_entry[v].vector;
	64	ret = request_irq(ccp_pci->msix[v].vector, ccp_irq_handler,
	65	0, ccp_pci->msix[v].name, dev);
	66	if (ret) {
	67	dev_notice(dev, "unable to allocate MSI-X IRQ (%d)\n",
	68	ret);
	69	goto e_irq;
	70	}
	71	}
	72
	73	return 0;
	74
	75	e_irq:
	76	while (v--)
	77	free_irq(ccp_pci->msix[v].vector, dev);
	78
	79	pci_disable_msix(pdev);
	80
	81	ccp_pci->msix_count = 0;
	82
	83	return ret;
	84	}
	85
	86	static int ccp_get_msi_irq(struct ccp_device *ccp)
	87	{
	88	struct device *dev = ccp->dev;
	89	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	90	int ret;
	91
	92	ret = pci_enable_msi(pdev);
	93	if (ret)
	94	return ret;
	95
3d77565b TL	96	ccp->irq = pdev->irq;
3d77565b TL	97	ret = request_irq(ccp->irq, ccp_irq_handler, 0, "ccp", dev);
63b94509 TL	98	if (ret) {
	99	dev_notice(dev, "unable to allocate MSI IRQ (%d)\n", ret);
	100	goto e_msi;
	101	}
	102
	103	return 0;
	104
	105	e_msi:
	106	pci_disable_msi(pdev);
	107
	108	return ret;
	109	}
	110
	111	static int ccp_get_irqs(struct ccp_device *ccp)
	112	{
	113	struct device *dev = ccp->dev;
	114	int ret;
	115
	116	ret = ccp_get_msix_irqs(ccp);
	117	if (!ret)
	118	return 0;
	119
	120	/* Couldn't get MSI-X vectors, try MSI */
	121	dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
	122	ret = ccp_get_msi_irq(ccp);
	123	if (!ret)
	124	return 0;
	125
	126	/* Couldn't get MSI interrupt */
	127	dev_notice(dev, "could not enable MSI (%d)\n", ret);
	128
	129	return ret;
	130	}
	131
	132	static void ccp_free_irqs(struct ccp_device *ccp)
	133	{
	134	struct ccp_pci *ccp_pci = ccp->dev_specific;
	135	struct device *dev = ccp->dev;
	136	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	137
	138	if (ccp_pci->msix_count) {
	139	while (ccp_pci->msix_count--)
	140	free_irq(ccp_pci->msix[ccp_pci->msix_count].vector,
	141	dev);
	142	pci_disable_msix(pdev);
	143	} else {
3d77565b	144	free_irq(ccp->irq, dev);
63b94509 TL	145	pci_disable_msi(pdev);
	146	}
	147	}
	148
	149	static int ccp_find_mmio_area(struct ccp_device *ccp)
	150	{
	151	struct device *dev = ccp->dev;
	152	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	153	resource_size_t io_len;
	154	unsigned long io_flags;
63b94509 TL	155
	156	io_flags = pci_resource_flags(pdev, IO_BAR);
	157	io_len = pci_resource_len(pdev, IO_BAR);
	158	if ((io_flags & IORESOURCE_MEM) && (io_len >= (IO_OFFSET + 0x800)))
	159	return IO_BAR;
	160
63b94509 TL	161	return -EIO;
	162	}
	163
	164	static int ccp_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
	165	{
	166	struct ccp_device *ccp;
	167	struct ccp_pci *ccp_pci;
	168	struct device *dev = &pdev->dev;
	169	unsigned int bar;
	170	int ret;
	171
	172	ret = -ENOMEM;
	173	ccp = ccp_alloc_struct(dev);
	174	if (!ccp)
	175	goto e_err;
	176
	177	ccp_pci = kzalloc(sizeof(*ccp_pci), GFP_KERNEL);
	178	if (!ccp_pci) {
	179	ret = -ENOMEM;
	180	goto e_free1;
	181	}
	182	ccp->dev_specific = ccp_pci;
	183	ccp->get_irq = ccp_get_irqs;
	184	ccp->free_irq = ccp_free_irqs;
	185
	186	ret = pci_request_regions(pdev, "ccp");
	187	if (ret) {
	188	dev_err(dev, "pci_request_regions failed (%d)\n", ret);
	189	goto e_free2;
	190	}
	191
	192	ret = pci_enable_device(pdev);
	193	if (ret) {
	194	dev_err(dev, "pci_enable_device failed (%d)\n", ret);
	195	goto e_regions;
	196	}
	197
	198	pci_set_master(pdev);
	199
	200	ret = ccp_find_mmio_area(ccp);
	201	if (ret < 0)
	202	goto e_device;
	203	bar = ret;
	204
	205	ret = -EIO;
	206	ccp->io_map = pci_iomap(pdev, bar, 0);
	207	if (ccp->io_map == NULL) {
	208	dev_err(dev, "pci_iomap failed\n");
	209	goto e_device;
	210	}
	211	ccp->io_regs = ccp->io_map + IO_OFFSET;
	212
3d77565b TL	213	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
	214	if (ret) {
	215	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
63b94509	216	if (ret) {
3d77565b	217	dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
63b94509	218	ret);
3d77565b	219	goto e_iomap;
63b94509 TL	220	}
	221	}
	222
	223	dev_set_drvdata(dev, ccp);
	224
	225	ret = ccp_init(ccp);
	226	if (ret)
3d77565b	227	goto e_iomap;
63b94509 TL	228
	229	dev_notice(dev, "enabled\n");
	230
	231	return 0;
	232
3d77565b	233	e_iomap:
63b94509 TL	234	pci_iounmap(pdev, ccp->io_map);
	235
	236	e_device:
	237	pci_disable_device(pdev);
63b94509 TL	238
	239	e_regions:
	240	pci_release_regions(pdev);
	241
	242	e_free2:
	243	kfree(ccp_pci);
	244
	245	e_free1:
	246	kfree(ccp);
	247
	248	e_err:
	249	dev_notice(dev, "initialization failed\n");
	250	return ret;
	251	}
	252
	253	static void ccp_pci_remove(struct pci_dev *pdev)
	254	{
	255	struct device *dev = &pdev->dev;
	256	struct ccp_device *ccp = dev_get_drvdata(dev);
	257
db34cf91 TL	258	if (!ccp)
	259	return;
	260
63b94509 TL	261	ccp_destroy(ccp);
	262
	263	pci_iounmap(pdev, ccp->io_map);
	264
	265	pci_disable_device(pdev);
63b94509 TL	266
	267	pci_release_regions(pdev);
	268
	269	kfree(ccp);
	270
	271	dev_notice(dev, "disabled\n");
	272	}
	273
	274	#ifdef CONFIG_PM
	275	static int ccp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
	276	{
	277	struct device *dev = &pdev->dev;
	278	struct ccp_device *ccp = dev_get_drvdata(dev);
	279	unsigned long flags;
	280	unsigned int i;
	281
	282	spin_lock_irqsave(&ccp->cmd_lock, flags);
	283
	284	ccp->suspending = 1;
	285
	286	/* Wake all the queue kthreads to prepare for suspend */
	287	for (i = 0; i < ccp->cmd_q_count; i++)
	288	wake_up_process(ccp->cmd_q[i].kthread);
	289
	290	spin_unlock_irqrestore(&ccp->cmd_lock, flags);
	291
	292	/* Wait for all queue kthreads to say they're done */
	293	while (!ccp_queues_suspended(ccp))
	294	wait_event_interruptible(ccp->suspend_queue,
	295	ccp_queues_suspended(ccp));
	296
	297	return 0;
	298	}
	299
	300	static int ccp_pci_resume(struct pci_dev *pdev)
	301	{
	302	struct device *dev = &pdev->dev;
	303	struct ccp_device *ccp = dev_get_drvdata(dev);
	304	unsigned long flags;
	305	unsigned int i;
	306
	307	spin_lock_irqsave(&ccp->cmd_lock, flags);
	308
	309	ccp->suspending = 0;
	310
	311	/* Wake up all the kthreads */
	312	for (i = 0; i < ccp->cmd_q_count; i++) {
	313	ccp->cmd_q[i].suspended = 0;
	314	wake_up_process(ccp->cmd_q[i].kthread);
	315	}
	316
	317	spin_unlock_irqrestore(&ccp->cmd_lock, flags);
	318
	319	return 0;
	320	}
	321	#endif
	322
9baa3c34	323	static const struct pci_device_id ccp_pci_table[] = {
63b94509 TL	324	{ PCI_VDEVICE(AMD, 0x1537), },
	325	/* Last entry must be zero */
	326	{ 0, }
	327	};
	328	MODULE_DEVICE_TABLE(pci, ccp_pci_table);
	329
	330	static struct pci_driver ccp_pci_driver = {
	331	.name = "AMD Cryptographic Coprocessor",
	332	.id_table = ccp_pci_table,
	333	.probe = ccp_pci_probe,
	334	.remove = ccp_pci_remove,
	335	#ifdef CONFIG_PM
	336	.suspend = ccp_pci_suspend,
	337	.resume = ccp_pci_resume,
	338	#endif
	339	};
	340
	341	int ccp_pci_init(void)
	342	{
	343	return pci_register_driver(&ccp_pci_driver);
	344	}
	345
	346	void ccp_pci_exit(void)
	347	{
	348	pci_unregister_driver(&ccp_pci_driver);
	349	}