[linux-2.6-block.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 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;
}

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;

	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;
	}

	ccp_platform->coherent = device_dma_is_coherent(ccp->dev);
	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);
}
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 TL	31	struct ccp_platform {
	32	int use_acpi;
	33	int coherent;
	34	};
	35
c4f4b325 TL	36	static int ccp_get_irq(struct ccp_device *ccp)
	37	{
	38	struct device *dev = ccp->dev;
	39	struct platform_device *pdev = container_of(dev,
	40	struct platform_device, dev);
	41	int ret;
	42
	43	ret = platform_get_irq(pdev, 0);
	44	if (ret < 0)
	45	return ret;
	46
	47	ccp->irq = ret;
	48	ret = request_irq(ccp->irq, ccp_irq_handler, 0, "ccp", dev);
	49	if (ret) {
	50	dev_notice(dev, "unable to allocate IRQ (%d)\n", ret);
	51	return ret;
	52	}
	53
	54	return 0;
	55	}
	56
	57	static int ccp_get_irqs(struct ccp_device *ccp)
	58	{
	59	struct device *dev = ccp->dev;
	60	int ret;
	61
	62	ret = ccp_get_irq(ccp);
	63	if (!ret)
	64	return 0;
	65
	66	/* Couldn't get an interrupt */
	67	dev_notice(dev, "could not enable interrupts (%d)\n", ret);
	68
	69	return ret;
	70	}
	71
	72	static void ccp_free_irqs(struct ccp_device *ccp)
	73	{
	74	struct device *dev = ccp->dev;
	75
	76	free_irq(ccp->irq, dev);
	77	}
	78
	79	static struct resource ccp_find_mmio_area(struct ccp_device ccp)
	80	{
	81	struct device *dev = ccp->dev;
	82	struct platform_device *pdev = container_of(dev,
	83	struct platform_device, dev);
	84	struct resource *ior;
	85
	86	ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	87	if (ior && (resource_size(ior) >= 0x800))
	88	return ior;
	89
	90	return NULL;
	91	}
	92
	93	static int ccp_platform_probe(struct platform_device *pdev)
	94	{
	95	struct ccp_device *ccp;
6c506343	96	struct ccp_platform *ccp_platform;
c4f4b325	97	struct device *dev = &pdev->dev;
6c506343	98	struct acpi_device *adev = ACPI_COMPANION(dev);
c4f4b325 TL	99	struct resource *ior;
	100	int ret;
	101
	102	ret = -ENOMEM;
	103	ccp = ccp_alloc_struct(dev);
	104	if (!ccp)
	105	goto e_err;
	106
6c506343 TL	107	ccp_platform = devm_kzalloc(dev, sizeof(*ccp_platform), GFP_KERNEL);
	108	if (!ccp_platform)
	109	goto e_err;
	110
	111	ccp->dev_specific = ccp_platform;
c4f4b325 TL	112	ccp->get_irq = ccp_get_irqs;
	113	ccp->free_irq = ccp_free_irqs;
	114
6c506343 TL	115	ccp_platform->use_acpi = (!adev \|\| acpi_disabled) ? 0 : 1;
6c506343 TL	116
c4f4b325 TL	117	ior = ccp_find_mmio_area(ccp);
	118	ccp->io_map = devm_ioremap_resource(dev, ior);
	119	if (IS_ERR(ccp->io_map)) {
	120	ret = PTR_ERR(ccp->io_map);
be03a3a0	121	goto e_err;
c4f4b325 TL	122	}
	123	ccp->io_regs = ccp->io_map;
	124
261bf074 TL	125	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
	126	if (ret) {
	127	dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
be03a3a0	128	goto e_err;
261bf074	129	}
c4f4b325	130
04825cfe	131	ccp_platform->coherent = device_dma_is_coherent(ccp->dev);
6c506343	132	if (ccp_platform->coherent)
126ae9ad TL	133	ccp->axcache = CACHE_WB_NO_ALLOC;
	134	else
	135	ccp->axcache = CACHE_NONE;
	136
c4f4b325 TL	137	dev_set_drvdata(dev, ccp);
	138
	139	ret = ccp_init(ccp);
	140	if (ret)
be03a3a0	141	goto e_err;
c4f4b325 TL	142
	143	dev_notice(dev, "enabled\n");
	144
	145	return 0;
	146
c4f4b325 TL	147	e_err:
	148	dev_notice(dev, "initialization failed\n");
	149	return ret;
	150	}
	151
	152	static int ccp_platform_remove(struct platform_device *pdev)
	153	{
	154	struct device *dev = &pdev->dev;
	155	struct ccp_device *ccp = dev_get_drvdata(dev);
	156
	157	ccp_destroy(ccp);
	158
c4f4b325 TL	159	dev_notice(dev, "disabled\n");
	160
	161	return 0;
	162	}
	163
	164	#ifdef CONFIG_PM
	165	static int ccp_platform_suspend(struct platform_device *pdev,
	166	pm_message_t state)
	167	{
	168	struct device *dev = &pdev->dev;
	169	struct ccp_device *ccp = dev_get_drvdata(dev);
	170	unsigned long flags;
	171	unsigned int i;
	172
	173	spin_lock_irqsave(&ccp->cmd_lock, flags);
	174
	175	ccp->suspending = 1;
	176
	177	/* Wake all the queue kthreads to prepare for suspend */
	178	for (i = 0; i < ccp->cmd_q_count; i++)
	179	wake_up_process(ccp->cmd_q[i].kthread);
	180
	181	spin_unlock_irqrestore(&ccp->cmd_lock, flags);
	182
	183	/* Wait for all queue kthreads to say they're done */
	184	while (!ccp_queues_suspended(ccp))
	185	wait_event_interruptible(ccp->suspend_queue,
	186	ccp_queues_suspended(ccp));
	187
	188	return 0;
	189	}
	190
	191	static int ccp_platform_resume(struct platform_device *pdev)
	192	{
	193	struct device *dev = &pdev->dev;
	194	struct ccp_device *ccp = dev_get_drvdata(dev);
	195	unsigned long flags;
	196	unsigned int i;
	197
	198	spin_lock_irqsave(&ccp->cmd_lock, flags);
	199
	200	ccp->suspending = 0;
	201
	202	/* Wake up all the kthreads */
	203	for (i = 0; i < ccp->cmd_q_count; i++) {
	204	ccp->cmd_q[i].suspended = 0;
	205	wake_up_process(ccp->cmd_q[i].kthread);
	206	}
	207
	208	spin_unlock_irqrestore(&ccp->cmd_lock, flags);
	209
	210	return 0;
	211	}
	212	#endif
	213
6c506343 TL	214	#ifdef CONFIG_ACPI
	215	static const struct acpi_device_id ccp_acpi_match[] = {
	216	{ "AMDI0C00", 0 },
	217	{ },
	218	};
	219	#endif
	220
	221	#ifdef CONFIG_OF
	222	static const struct of_device_id ccp_of_match[] = {
c4f4b325 TL	223	{ .compatible = "amd,ccp-seattle-v1a" },
	224	{ },
	225	};
6c506343	226	#endif
c4f4b325 TL	227
	228	static struct platform_driver ccp_platform_driver = {
	229	.driver = {
	230	.name = "AMD Cryptographic Coprocessor",
6c506343 TL	231	#ifdef CONFIG_ACPI
	232	.acpi_match_table = ccp_acpi_match,
	233	#endif
	234	#ifdef CONFIG_OF
	235	.of_match_table = ccp_of_match,
	236	#endif
c4f4b325 TL	237	},
	238	.probe = ccp_platform_probe,
	239	.remove = ccp_platform_remove,
	240	#ifdef CONFIG_PM
	241	.suspend = ccp_platform_suspend,
	242	.resume = ccp_platform_resume,
	243	#endif
	244	};
	245
	246	int ccp_platform_init(void)
	247	{
	248	return platform_driver_register(&ccp_platform_driver);
	249	}
	250
	251	void ccp_platform_exit(void)
	252	{
	253	platform_driver_unregister(&ccp_platform_driver);
	254	}