[net-next-2.6.git] / drivers / char / hw_random / octeon-rng.c

/*
 * Hardware Random Number Generator support for Cavium Networks
 * Octeon processor family.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2009 Cavium Networks
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/hw_random.h>
#include <linux/io.h>
#include <linux/gfp.h>

#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-rnm-defs.h>

struct octeon_rng {
	struct hwrng ops;
	void __iomem *control_status;
	void __iomem *result;
};

static int octeon_rng_init(struct hwrng *rng)
{
	union cvmx_rnm_ctl_status ctl;
	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);

	ctl.u64 = 0;
	ctl.s.ent_en = 1; /* Enable the entropy source.  */
	ctl.s.rng_en = 1; /* Enable the RNG hardware.  */
	cvmx_write_csr((u64)p->control_status, ctl.u64);
	return 0;
}

static void octeon_rng_cleanup(struct hwrng *rng)
{
	union cvmx_rnm_ctl_status ctl;
	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);

	ctl.u64 = 0;
	/* Disable everything.  */
	cvmx_write_csr((u64)p->control_status, ctl.u64);
}

static int octeon_rng_data_read(struct hwrng *rng, u32 *data)
{
	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);

	*data = cvmx_read64_uint32((u64)p->result);
	return sizeof(u32);
}

static int __devinit octeon_rng_probe(struct platform_device *pdev)
{
	struct resource *res_ports;
	struct resource *res_result;
	struct octeon_rng *rng;
	int ret;
	struct hwrng ops = {
		.name = "octeon",
		.init = octeon_rng_init,
		.cleanup = octeon_rng_cleanup,
		.data_read = octeon_rng_data_read
	};

	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
	if (!rng)
		return -ENOMEM;

	res_ports = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res_ports)
		goto err_ports;

	res_result = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!res_result)
		goto err_ports;


	rng->control_status = devm_ioremap_nocache(&pdev->dev,
						   res_ports->start,
						   sizeof(u64));
	if (!rng->control_status)
		goto err_ports;

	rng->result = devm_ioremap_nocache(&pdev->dev,
					   res_result->start,
					   sizeof(u64));
	if (!rng->result)
		goto err_r;

	rng->ops = ops;

	dev_set_drvdata(&pdev->dev, &rng->ops);
	ret = hwrng_register(&rng->ops);
	if (ret)
		goto err;

	dev_info(&pdev->dev, "Octeon Random Number Generator\n");

	return 0;
err:
	devm_iounmap(&pdev->dev, rng->control_status);
err_r:
	devm_iounmap(&pdev->dev, rng->result);
err_ports:
	devm_kfree(&pdev->dev, rng);
	return -ENOENT;
}

static int __exit octeon_rng_remove(struct platform_device *pdev)
{
	struct hwrng *rng = dev_get_drvdata(&pdev->dev);

	hwrng_unregister(rng);

	return 0;
}

static struct platform_driver octeon_rng_driver = {
	.driver = {
		.name		= "octeon_rng",
		.owner		= THIS_MODULE,
	},
	.probe		= octeon_rng_probe,
	.remove		= __exit_p(octeon_rng_remove),
};

static int __init octeon_rng_mod_init(void)
{
	return platform_driver_register(&octeon_rng_driver);
}

static void __exit octeon_rng_mod_exit(void)
{
	platform_driver_unregister(&octeon_rng_driver);
}

module_init(octeon_rng_mod_init);
module_exit(octeon_rng_mod_exit);

MODULE_AUTHOR("David Daney");
MODULE_LICENSE("GPL");
Commit	Line	Data
f7557dc8 DD	1	/*
	2	* Hardware Random Number Generator support for Cavium Networks
	3	* Octeon processor family.
	4	*
	5	* This file is subject to the terms and conditions of the GNU General Public
	6	* License. See the file "COPYING" in the main directory of this archive
	7	* for more details.
	8	*
	9	* Copyright (C) 2009 Cavium Networks
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/device.h>
	16	#include <linux/hw_random.h>
	17	#include <linux/io.h>
5a0e3ad6	18	#include <linux/gfp.h>
f7557dc8 DD	19
	20	#include <asm/octeon/octeon.h>
	21	#include <asm/octeon/cvmx-rnm-defs.h>
	22
	23	struct octeon_rng {
	24	struct hwrng ops;
	25	void __iomem *control_status;
	26	void __iomem *result;
	27	};
	28
	29	static int octeon_rng_init(struct hwrng *rng)
	30	{
	31	union cvmx_rnm_ctl_status ctl;
	32	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
	33
	34	ctl.u64 = 0;
	35	ctl.s.ent_en = 1; /* Enable the entropy source. */
	36	ctl.s.rng_en = 1; /* Enable the RNG hardware. */
	37	cvmx_write_csr((u64)p->control_status, ctl.u64);
	38	return 0;
	39	}
	40
	41	static void octeon_rng_cleanup(struct hwrng *rng)
	42	{
	43	union cvmx_rnm_ctl_status ctl;
	44	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
	45
	46	ctl.u64 = 0;
	47	/* Disable everything. */
	48	cvmx_write_csr((u64)p->control_status, ctl.u64);
	49	}
	50
	51	static int octeon_rng_data_read(struct hwrng rng, u32 data)
	52	{
	53	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
	54
	55	*data = cvmx_read64_uint32((u64)p->result);
	56	return sizeof(u32);
	57	}
	58
	59	static int __devinit octeon_rng_probe(struct platform_device *pdev)
	60	{
	61	struct resource *res_ports;
	62	struct resource *res_result;
	63	struct octeon_rng *rng;
	64	int ret;
	65	struct hwrng ops = {
	66	.name = "octeon",
	67	.init = octeon_rng_init,
	68	.cleanup = octeon_rng_cleanup,
	69	.data_read = octeon_rng_data_read
	70	};
	71
	72	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
	73	if (!rng)
	74	return -ENOMEM;
	75
	76	res_ports = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	77	if (!res_ports)
	78	goto err_ports;
	79
	80	res_result = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	81	if (!res_result)
	82	goto err_ports;
83
84
85	rng->control_status = devm_ioremap_nocache(&pdev->dev,
86	res_ports->start,
87	sizeof(u64));
88	if (!rng->control_status)
89	goto err_ports;
90
91	rng->result = devm_ioremap_nocache(&pdev->dev,
92	res_result->start,
93	sizeof(u64));
94	if (!rng->result)
95	goto err_r;
96
97	rng->ops = ops;
98
99	dev_set_drvdata(&pdev->dev, &rng->ops);
100	ret = hwrng_register(&rng->ops);
101	if (ret)
102	goto err;
103
104	dev_info(&pdev->dev, "Octeon Random Number Generator\n");
105
106	return 0;
107	err:
108	devm_iounmap(&pdev->dev, rng->control_status);
109	err_r:
110	devm_iounmap(&pdev->dev, rng->result);
111	err_ports:
112	devm_kfree(&pdev->dev, rng);
113	return -ENOENT;
114	}
115
116	static int __exit octeon_rng_remove(struct platform_device *pdev)
117	{
118	struct hwrng *rng = dev_get_drvdata(&pdev->dev);
119
120	hwrng_unregister(rng);
121
122	return 0;
123	}
124
125	static struct platform_driver octeon_rng_driver = {
126	.driver = {
127	.name = "octeon_rng",
128	.owner = THIS_MODULE,
129	},
130	.probe = octeon_rng_probe,
131	.remove = __exit_p(octeon_rng_remove),
132	};
133
134	static int __init octeon_rng_mod_init(void)
135	{
136	return platform_driver_register(&octeon_rng_driver);
137	}
138
139	static void __exit octeon_rng_mod_exit(void)
140	{
141	platform_driver_unregister(&octeon_rng_driver);
142	}
143
144	module_init(octeon_rng_mod_init);
145	module_exit(octeon_rng_mod_exit);
146
147	MODULE_AUTHOR("David Daney");
148	MODULE_LICENSE("GPL");