[net-next-2.6.git] / drivers / spi / xilinx_spi_of.c

/*
 * Xilinx SPI OF device driver
 *
 * Copyright (c) 2009 Intel Corporation
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Supports:
 * Xilinx SPI devices as OF devices
 *
 * Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/slab.h>

#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
#include <linux/of_spi.h>

#include <linux/spi/xilinx_spi.h>
#include "xilinx_spi.h"


static int __devinit xilinx_spi_of_probe(struct platform_device *ofdev,
	const struct of_device_id *match)
{
	struct spi_master *master;
	struct xspi_platform_data *pdata;
	struct resource r_mem;
	struct resource r_irq;
	int rc = 0;
	const u32 *prop;
	int len;

	rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem);
	if (rc) {
		dev_warn(&ofdev->dev, "invalid address\n");
		return rc;
	}

	rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq);
	if (rc == NO_IRQ) {
		dev_warn(&ofdev->dev, "no IRQ found\n");
		return -ENODEV;
	}

	ofdev->dev.platform_data =
		kzalloc(sizeof(struct xspi_platform_data), GFP_KERNEL);
	pdata = ofdev->dev.platform_data;
	if (!pdata)
		return -ENOMEM;

	/* number of slave select bits is required */
	prop = of_get_property(ofdev->dev.of_node, "xlnx,num-ss-bits", &len);
	if (!prop || len < sizeof(*prop)) {
		dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
		return -EINVAL;
	}
	pdata->num_chipselect = *prop;
	pdata->bits_per_word = 8;
	master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1);
	if (!master)
		return -ENODEV;

	dev_set_drvdata(&ofdev->dev, master);

	return 0;
}

static int __devexit xilinx_spi_remove(struct platform_device *ofdev)
{
	xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev));
	dev_set_drvdata(&ofdev->dev, 0);
	kfree(ofdev->dev.platform_data);
	ofdev->dev.platform_data = NULL;
	return 0;
}

static int __exit xilinx_spi_of_remove(struct platform_device *op)
{
	return xilinx_spi_remove(op);
}

static const struct of_device_id xilinx_spi_of_match[] = {
	{ .compatible = "xlnx,xps-spi-2.00.a", },
	{ .compatible = "xlnx,xps-spi-2.00.b", },
	{}
};

MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);

static struct of_platform_driver xilinx_spi_of_driver = {
	.probe = xilinx_spi_of_probe,
	.remove = __exit_p(xilinx_spi_of_remove),
	.driver = {
		.name = "xilinx-xps-spi",
		.owner = THIS_MODULE,
		.of_match_table = xilinx_spi_of_match,
	},
};

static int __init xilinx_spi_of_init(void)
{
	return of_register_platform_driver(&xilinx_spi_of_driver);
}
module_init(xilinx_spi_of_init);

static void __exit xilinx_spi_of_exit(void)
{
	of_unregister_platform_driver(&xilinx_spi_of_driver);
}
module_exit(xilinx_spi_of_exit);

MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
MODULE_DESCRIPTION("Xilinx SPI platform driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d5af91a1 RR	1	/*
	2	* Xilinx SPI OF device driver
	3	*
	4	* Copyright (c) 2009 Intel Corporation
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	18	*/
	19
	20	/* Supports:
	21	* Xilinx SPI devices as OF devices
	22	*
	23	* Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc.
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/init.h>
	28	#include <linux/interrupt.h>
	29	#include <linux/io.h>
5a0e3ad6	30	#include <linux/slab.h>
d5af91a1	31
22ae782f	32	#include <linux/of_address.h>
d5af91a1 RR	33	#include <linux/of_platform.h>
	34	#include <linux/of_device.h>
	35	#include <linux/of_spi.h>
	36
	37	#include <linux/spi/xilinx_spi.h>
	38	#include "xilinx_spi.h"
	39
	40
2dc11581	41	static int __devinit xilinx_spi_of_probe(struct platform_device *ofdev,
d5af91a1 RR	42	const struct of_device_id *match)
	43	{
	44	struct spi_master *master;
	45	struct xspi_platform_data *pdata;
	46	struct resource r_mem;
	47	struct resource r_irq;
	48	int rc = 0;
	49	const u32 *prop;
	50	int len;
	51
bf6a67ee	52	rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem);
d5af91a1 RR	53	if (rc) {
	54	dev_warn(&ofdev->dev, "invalid address\n");
	55	return rc;
	56	}
	57
bf6a67ee	58	rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq);
d5af91a1 RR	59	if (rc == NO_IRQ) {
	60	dev_warn(&ofdev->dev, "no IRQ found\n");
	61	return -ENODEV;
	62	}
	63
	64	ofdev->dev.platform_data =
	65	kzalloc(sizeof(struct xspi_platform_data), GFP_KERNEL);
	66	pdata = ofdev->dev.platform_data;
	67	if (!pdata)
	68	return -ENOMEM;
	69
	70	/* number of slave select bits is required */
bf6a67ee	71	prop = of_get_property(ofdev->dev.of_node, "xlnx,num-ss-bits", &len);
d5af91a1 RR	72	if (!prop \|\| len < sizeof(*prop)) {
	73	dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
	74	return -EINVAL;
	75	}
	76	pdata->num_chipselect = *prop;
c9da2e12	77	pdata->bits_per_word = 8;
d5af91a1 RR	78	master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1);
	79	if (!master)
	80	return -ENODEV;
	81
	82	dev_set_drvdata(&ofdev->dev, master);
	83
d5af91a1 RR	84	return 0;
	85	}
	86
2dc11581	87	static int __devexit xilinx_spi_remove(struct platform_device *ofdev)
d5af91a1 RR	88	{
	89	xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev));
	90	dev_set_drvdata(&ofdev->dev, 0);
	91	kfree(ofdev->dev.platform_data);
	92	ofdev->dev.platform_data = NULL;
	93	return 0;
	94	}
	95
2dc11581	96	static int __exit xilinx_spi_of_remove(struct platform_device *op)
d5af91a1 RR	97	{
	98	return xilinx_spi_remove(op);
	99	}
	100
631e61b7	101	static const struct of_device_id xilinx_spi_of_match[] = {
d5af91a1 RR	102	{ .compatible = "xlnx,xps-spi-2.00.a", },
	103	{ .compatible = "xlnx,xps-spi-2.00.b", },
	104	{}
	105	};
	106
	107	MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
	108
	109	static struct of_platform_driver xilinx_spi_of_driver = {
d5af91a1 RR	110	.probe = xilinx_spi_of_probe,
	111	.remove = __exit_p(xilinx_spi_of_remove),
	112	.driver = {
	113	.name = "xilinx-xps-spi",
	114	.owner = THIS_MODULE,
4018294b	115	.of_match_table = xilinx_spi_of_match,
d5af91a1 RR	116	},
	117	};
	118
	119	static int __init xilinx_spi_of_init(void)
	120	{
	121	return of_register_platform_driver(&xilinx_spi_of_driver);
	122	}
	123	module_init(xilinx_spi_of_init);
	124
	125	static void __exit xilinx_spi_of_exit(void)
	126	{
	127	of_unregister_platform_driver(&xilinx_spi_of_driver);
	128	}
	129	module_exit(xilinx_spi_of_exit);
	130
	131	MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
	132	MODULE_DESCRIPTION("Xilinx SPI platform driver");
	133	MODULE_LICENSE("GPL v2");