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> 30#include <linux/slab.h> 31 32#include <linux/of_address.h> 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 41static int __devinit xilinx_spi_of_probe(struct platform_device *ofdev, 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 52 rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem); 53 if (rc) { 54 dev_warn(&ofdev->dev, "invalid address\n"); 55 return rc; 56 } 57 58 rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq); 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 */ 71 prop = of_get_property(ofdev->dev.of_node, "xlnx,num-ss-bits", &len); 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; 77 pdata->bits_per_word = 8; 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 84 return 0; 85} 86 87static int __devexit xilinx_spi_remove(struct platform_device *ofdev) 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 96static int __exit xilinx_spi_of_remove(struct platform_device *op) 97{ 98 return xilinx_spi_remove(op); 99} 100 101static const struct of_device_id xilinx_spi_of_match[] = { 102 { .compatible = "xlnx,xps-spi-2.00.a", }, 103 { .compatible = "xlnx,xps-spi-2.00.b", }, 104 {} 105}; 106 107MODULE_DEVICE_TABLE(of, xilinx_spi_of_match); 108 109static struct of_platform_driver xilinx_spi_of_driver = { 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, 115 .of_match_table = xilinx_spi_of_match, 116 }, 117}; 118 119static int __init xilinx_spi_of_init(void) 120{ 121 return of_register_platform_driver(&xilinx_spi_of_driver); 122} 123module_init(xilinx_spi_of_init); 124 125static void __exit xilinx_spi_of_exit(void) 126{ 127 of_unregister_platform_driver(&xilinx_spi_of_driver); 128} 129module_exit(xilinx_spi_of_exit); 130 131MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>"); 132MODULE_DESCRIPTION("Xilinx SPI platform driver"); 133MODULE_LICENSE("GPL v2"); 134