134 lines
3.4 KiB
C
134 lines
3.4 KiB
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");
|