136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/*
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* Xilinx SPI OF device driver
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*
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* Copyright (c) 2009 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* Supports:
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* Xilinx SPI devices as OF devices
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*
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* Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/of_platform.h>
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#include <linux/of_device.h>
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#include <linux/of_spi.h>
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#include <linux/spi/xilinx_spi.h>
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#include "xilinx_spi.h"
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static int __devinit xilinx_spi_of_probe(struct of_device *ofdev,
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const struct of_device_id *match)
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{
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struct spi_master *master;
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struct xspi_platform_data *pdata;
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struct resource r_mem;
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struct resource r_irq;
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int rc = 0;
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const u32 *prop;
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int len;
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rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem);
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if (rc) {
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dev_warn(&ofdev->dev, "invalid address\n");
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return rc;
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}
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rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq);
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if (rc == NO_IRQ) {
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dev_warn(&ofdev->dev, "no IRQ found\n");
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return -ENODEV;
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}
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ofdev->dev.platform_data =
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kzalloc(sizeof(struct xspi_platform_data), GFP_KERNEL);
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pdata = ofdev->dev.platform_data;
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if (!pdata)
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return -ENOMEM;
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/* number of slave select bits is required */
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prop = of_get_property(ofdev->dev.of_node, "xlnx,num-ss-bits", &len);
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if (!prop || len < sizeof(*prop)) {
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dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
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return -EINVAL;
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}
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pdata->num_chipselect = *prop;
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pdata->bits_per_word = 8;
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master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1);
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if (!master)
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return -ENODEV;
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dev_set_drvdata(&ofdev->dev, master);
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/* Add any subnodes on the SPI bus */
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of_register_spi_devices(master, ofdev->dev.of_node);
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return 0;
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}
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static int __devexit xilinx_spi_remove(struct of_device *ofdev)
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{
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xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev));
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dev_set_drvdata(&ofdev->dev, 0);
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kfree(ofdev->dev.platform_data);
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ofdev->dev.platform_data = NULL;
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return 0;
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}
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static int __exit xilinx_spi_of_remove(struct of_device *op)
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{
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return xilinx_spi_remove(op);
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}
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static const struct of_device_id xilinx_spi_of_match[] = {
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{ .compatible = "xlnx,xps-spi-2.00.a", },
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{ .compatible = "xlnx,xps-spi-2.00.b", },
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{}
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};
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MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
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static struct of_platform_driver xilinx_spi_of_driver = {
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.probe = xilinx_spi_of_probe,
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.remove = __exit_p(xilinx_spi_of_remove),
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.driver = {
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.name = "xilinx-xps-spi",
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.owner = THIS_MODULE,
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.of_match_table = xilinx_spi_of_match,
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},
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};
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static int __init xilinx_spi_of_init(void)
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{
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return of_register_platform_driver(&xilinx_spi_of_driver);
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}
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module_init(xilinx_spi_of_init);
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static void __exit xilinx_spi_of_exit(void)
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{
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of_unregister_platform_driver(&xilinx_spi_of_driver);
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}
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module_exit(xilinx_spi_of_exit);
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MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
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MODULE_DESCRIPTION("Xilinx SPI platform driver");
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MODULE_LICENSE("GPL v2");
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