[mirror_ubuntu-artful-kernel.git] / drivers / crypto / ccp / ccp-platform.c

/*
 * 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 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;
}

static int ccp_platform_probe(struct platform_device *pdev)
{
	struct ccp_device *ccp;
	struct ccp_platform *ccp_platform;
	struct device *dev = &pdev->dev;
	enum dev_dma_attr attr;
	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;

	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;

	attr = device_get_dma_attr(dev);
	if (attr == DEV_DMA_NOT_SUPPORTED) {
		dev_err(dev, "DMA is not supported");
		goto e_err;
	}

	ccp_platform->coherent = (attr == DEV_DMA_COHERENT);
	if (ccp_platform->coherent)
		ccp->axcache = CACHE_WB_NO_ALLOC;
	else
		ccp->axcache = CACHE_NONE;

	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;
	}

	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 },
	{ },
};
MODULE_DEVICE_TABLE(acpi, ccp_acpi_match);
#endif

#ifdef CONFIG_OF
static const struct of_device_id ccp_of_match[] = {
	{ .compatible = "amd,ccp-seattle-v1a" },
	{ },
};
MODULE_DEVICE_TABLE(of, ccp_of_match);
#endif

static struct platform_driver ccp_platform_driver = {
	.driver = {
		.name = "ccp",
#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);
}
Commit	Line	Data
c4f4b325 TL	1	/*
	2	* AMD Cryptographic Coprocessor (CCP) driver
	3	*
	4	* Copyright (C) 2014 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>
	15	#include <linux/device.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/ioport.h>
	18	#include <linux/dma-mapping.h>
	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>
126ae9ad	25	#include <linux/of.h>
6c506343 TL	26	#include <linux/of_address.h>
6c506343 TL	27	#include <linux/acpi.h>
c4f4b325 TL	28
	29	#include "ccp-dev.h"
	30
6c506343	31	struct ccp_platform {
6c506343 TL	32	int coherent;
	33	};
	34
c4f4b325 TL	35	static int ccp_get_irq(struct ccp_device *ccp)
	36	{
	37	struct device *dev = ccp->dev;
	38	struct platform_device *pdev = container_of(dev,
	39	struct platform_device, dev);
	40	int ret;
	41
	42	ret = platform_get_irq(pdev, 0);
	43	if (ret < 0)
	44	return ret;
	45
	46	ccp->irq = ret;
	47	ret = request_irq(ccp->irq, ccp_irq_handler, 0, "ccp", dev);
	48	if (ret) {
	49	dev_notice(dev, "unable to allocate IRQ (%d)\n", ret);
	50	return ret;
	51	}
	52
	53	return 0;
	54	}
	55
	56	static int ccp_get_irqs(struct ccp_device *ccp)
	57	{
	58	struct device *dev = ccp->dev;
	59	int ret;
	60
	61	ret = ccp_get_irq(ccp);
	62	if (!ret)
	63	return 0;
	64
	65	/* Couldn't get an interrupt */
	66	dev_notice(dev, "could not enable interrupts (%d)\n", ret);
	67
	68	return ret;
	69	}
	70
	71	static void ccp_free_irqs(struct ccp_device *ccp)
	72	{
	73	struct device *dev = ccp->dev;
	74
	75	free_irq(ccp->irq, dev);
	76	}
	77
	78	static struct resource ccp_find_mmio_area(struct ccp_device ccp)
	79	{
	80	struct device *dev = ccp->dev;
	81	struct platform_device *pdev = container_of(dev,
	82	struct platform_device, dev);
	83	struct resource *ior;
	84
	85	ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	86	if (ior && (resource_size(ior) >= 0x800))
	87	return ior;
	88
	89	return NULL;
	90	}
	91
	92	static int ccp_platform_probe(struct platform_device *pdev)
	93	{
	94	struct ccp_device *ccp;
6c506343	95	struct ccp_platform *ccp_platform;
c4f4b325	96	struct device *dev = &pdev->dev;
1831eff8	97	enum dev_dma_attr attr;
c4f4b325 TL	98	struct resource *ior;
	99	int ret;
	100
	101	ret = -ENOMEM;
	102	ccp = ccp_alloc_struct(dev);
	103	if (!ccp)
	104	goto e_err;
	105
6c506343 TL	106	ccp_platform = devm_kzalloc(dev, sizeof(*ccp_platform), GFP_KERNEL);
	107	if (!ccp_platform)
	108	goto e_err;
	109
	110	ccp->dev_specific = ccp_platform;
c4f4b325 TL	111	ccp->get_irq = ccp_get_irqs;
	112	ccp->free_irq = ccp_free_irqs;
	113
	114	ior = ccp_find_mmio_area(ccp);
	115	ccp->io_map = devm_ioremap_resource(dev, ior);
	116	if (IS_ERR(ccp->io_map)) {
	117	ret = PTR_ERR(ccp->io_map);
be03a3a0	118	goto e_err;
c4f4b325 TL	119	}
	120	ccp->io_regs = ccp->io_map;
	121
1831eff8 SS	122	attr = device_get_dma_attr(dev);
	123	if (attr == DEV_DMA_NOT_SUPPORTED) {
	124	dev_err(dev, "DMA is not supported");
be03a3a0	125	goto e_err;
261bf074	126	}
c4f4b325	127
1831eff8	128	ccp_platform->coherent = (attr == DEV_DMA_COHERENT);
6c506343	129	if (ccp_platform->coherent)
126ae9ad TL	130	ccp->axcache = CACHE_WB_NO_ALLOC;
	131	else
	132	ccp->axcache = CACHE_NONE;
	133
1831eff8 SS	134	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
	135	if (ret) {
	136	dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
	137	goto e_err;
	138	}
	139
c4f4b325 TL	140	dev_set_drvdata(dev, ccp);
	141
	142	ret = ccp_init(ccp);
	143	if (ret)
be03a3a0	144	goto e_err;
c4f4b325 TL	145
	146	dev_notice(dev, "enabled\n");
	147
	148	return 0;
	149
c4f4b325 TL	150	e_err:
	151	dev_notice(dev, "initialization failed\n");
	152	return ret;
	153	}
	154
	155	static int ccp_platform_remove(struct platform_device *pdev)
	156	{
	157	struct device *dev = &pdev->dev;
	158	struct ccp_device *ccp = dev_get_drvdata(dev);
	159
	160	ccp_destroy(ccp);
	161
c4f4b325 TL	162	dev_notice(dev, "disabled\n");
	163
	164	return 0;
	165	}
	166
	167	#ifdef CONFIG_PM
	168	static int ccp_platform_suspend(struct platform_device *pdev,
	169	pm_message_t state)
	170	{
	171	struct device *dev = &pdev->dev;
	172	struct ccp_device *ccp = dev_get_drvdata(dev);
	173	unsigned long flags;
	174	unsigned int i;
	175
	176	spin_lock_irqsave(&ccp->cmd_lock, flags);
	177
	178	ccp->suspending = 1;
	179
	180	/* Wake all the queue kthreads to prepare for suspend */
	181	for (i = 0; i < ccp->cmd_q_count; i++)
	182	wake_up_process(ccp->cmd_q[i].kthread);
	183
	184	spin_unlock_irqrestore(&ccp->cmd_lock, flags);
	185
	186	/* Wait for all queue kthreads to say they're done */
	187	while (!ccp_queues_suspended(ccp))
	188	wait_event_interruptible(ccp->suspend_queue,
	189	ccp_queues_suspended(ccp));
	190
	191	return 0;
	192	}
	193
	194	static int ccp_platform_resume(struct platform_device *pdev)
	195	{
	196	struct device *dev = &pdev->dev;
	197	struct ccp_device *ccp = dev_get_drvdata(dev);
	198	unsigned long flags;
	199	unsigned int i;
	200
	201	spin_lock_irqsave(&ccp->cmd_lock, flags);
	202
	203	ccp->suspending = 0;
	204
	205	/* Wake up all the kthreads */
	206	for (i = 0; i < ccp->cmd_q_count; i++) {
	207	ccp->cmd_q[i].suspended = 0;
	208	wake_up_process(ccp->cmd_q[i].kthread);
	209	}
	210
	211	spin_unlock_irqrestore(&ccp->cmd_lock, flags);
	212
	213	return 0;
	214	}
	215	#endif
	216
6c506343 TL	217	#ifdef CONFIG_ACPI
	218	static const struct acpi_device_id ccp_acpi_match[] = {
	219	{ "AMDI0C00", 0 },
	220	{ },
	221	};
6170511a	222	MODULE_DEVICE_TABLE(acpi, ccp_acpi_match);
6c506343 TL	223	#endif
	224
	225	#ifdef CONFIG_OF
	226	static const struct of_device_id ccp_of_match[] = {
c4f4b325 TL	227	{ .compatible = "amd,ccp-seattle-v1a" },
	228	{ },
	229	};
6170511a	230	MODULE_DEVICE_TABLE(of, ccp_of_match);
6c506343	231	#endif
c4f4b325 TL	232
	233	static struct platform_driver ccp_platform_driver = {
	234	.driver = {
166db195	235	.name = "ccp",
6c506343 TL	236	#ifdef CONFIG_ACPI
	237	.acpi_match_table = ccp_acpi_match,
	238	#endif
	239	#ifdef CONFIG_OF
	240	.of_match_table = ccp_of_match,
	241	#endif
c4f4b325 TL	242	},
	243	.probe = ccp_platform_probe,
	244	.remove = ccp_platform_remove,
	245	#ifdef CONFIG_PM
	246	.suspend = ccp_platform_suspend,
	247	.resume = ccp_platform_resume,
	248	#endif
	249	};
	250
	251	int ccp_platform_init(void)
	252	{
	253	return platform_driver_register(&ccp_platform_driver);
	254	}
	255
	256	void ccp_platform_exit(void)
	257	{
	258	platform_driver_unregister(&ccp_platform_driver);
	259	}