Richard Röjfors | d5af91a | 2009-11-13 12:28:39 +0100 | [diff] [blame] | 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 | |
| 31 | #include <linux/of_platform.h> |
| 32 | #include <linux/of_device.h> |
| 33 | #include <linux/of_spi.h> |
| 34 | |
| 35 | #include <linux/spi/xilinx_spi.h> |
| 36 | #include "xilinx_spi.h" |
| 37 | |
| 38 | |
| 39 | static int __devinit xilinx_spi_of_probe(struct of_device *ofdev, |
| 40 | const struct of_device_id *match) |
| 41 | { |
| 42 | struct spi_master *master; |
| 43 | struct xspi_platform_data *pdata; |
| 44 | struct resource r_mem; |
| 45 | struct resource r_irq; |
| 46 | int rc = 0; |
| 47 | const u32 *prop; |
| 48 | int len; |
| 49 | |
| 50 | rc = of_address_to_resource(ofdev->node, 0, &r_mem); |
| 51 | if (rc) { |
| 52 | dev_warn(&ofdev->dev, "invalid address\n"); |
| 53 | return rc; |
| 54 | } |
| 55 | |
| 56 | rc = of_irq_to_resource(ofdev->node, 0, &r_irq); |
| 57 | if (rc == NO_IRQ) { |
| 58 | dev_warn(&ofdev->dev, "no IRQ found\n"); |
| 59 | return -ENODEV; |
| 60 | } |
| 61 | |
| 62 | ofdev->dev.platform_data = |
| 63 | kzalloc(sizeof(struct xspi_platform_data), GFP_KERNEL); |
| 64 | pdata = ofdev->dev.platform_data; |
| 65 | if (!pdata) |
| 66 | return -ENOMEM; |
| 67 | |
| 68 | /* number of slave select bits is required */ |
| 69 | prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len); |
| 70 | if (!prop || len < sizeof(*prop)) { |
| 71 | dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n"); |
| 72 | return -EINVAL; |
| 73 | } |
| 74 | pdata->num_chipselect = *prop; |
Richard Röjfors | c9da2e1 | 2009-11-13 12:28:55 +0100 | [diff] [blame] | 75 | pdata->bits_per_word = 8; |
Richard Röjfors | d5af91a | 2009-11-13 12:28:39 +0100 | [diff] [blame] | 76 | master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1); |
| 77 | if (!master) |
| 78 | return -ENODEV; |
| 79 | |
| 80 | dev_set_drvdata(&ofdev->dev, master); |
| 81 | |
| 82 | /* Add any subnodes on the SPI bus */ |
| 83 | of_register_spi_devices(master, ofdev->node); |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static int __devexit xilinx_spi_remove(struct of_device *ofdev) |
| 89 | { |
| 90 | xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev)); |
| 91 | dev_set_drvdata(&ofdev->dev, 0); |
| 92 | kfree(ofdev->dev.platform_data); |
| 93 | ofdev->dev.platform_data = NULL; |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static int __exit xilinx_spi_of_remove(struct of_device *op) |
| 98 | { |
| 99 | return xilinx_spi_remove(op); |
| 100 | } |
| 101 | |
Márton Németh | 631e61b7 | 2010-01-20 13:49:44 -0700 | [diff] [blame] | 102 | static const struct of_device_id xilinx_spi_of_match[] = { |
Richard Röjfors | d5af91a | 2009-11-13 12:28:39 +0100 | [diff] [blame] | 103 | { .compatible = "xlnx,xps-spi-2.00.a", }, |
| 104 | { .compatible = "xlnx,xps-spi-2.00.b", }, |
| 105 | {} |
| 106 | }; |
| 107 | |
| 108 | MODULE_DEVICE_TABLE(of, xilinx_spi_of_match); |
| 109 | |
| 110 | static struct of_platform_driver xilinx_spi_of_driver = { |
| 111 | .match_table = xilinx_spi_of_match, |
| 112 | .probe = xilinx_spi_of_probe, |
| 113 | .remove = __exit_p(xilinx_spi_of_remove), |
| 114 | .driver = { |
| 115 | .name = "xilinx-xps-spi", |
| 116 | .owner = THIS_MODULE, |
| 117 | }, |
| 118 | }; |
| 119 | |
| 120 | static int __init xilinx_spi_of_init(void) |
| 121 | { |
| 122 | return of_register_platform_driver(&xilinx_spi_of_driver); |
| 123 | } |
| 124 | module_init(xilinx_spi_of_init); |
| 125 | |
| 126 | static void __exit xilinx_spi_of_exit(void) |
| 127 | { |
| 128 | of_unregister_platform_driver(&xilinx_spi_of_driver); |
| 129 | } |
| 130 | module_exit(xilinx_spi_of_exit); |
| 131 | |
| 132 | MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>"); |
| 133 | MODULE_DESCRIPTION("Xilinx SPI platform driver"); |
| 134 | MODULE_LICENSE("GPL v2"); |