drivers/staging/xillybus/xillybus_of.c

   1 /*
   2  * linux/drivers/misc/xillybus_of.c
   3  *
   4  * Copyright 2011 Xillybus Ltd, http://xillybus.com
   5  *
   6  * Driver for the Xillybus FPGA/host framework using Open Firmware.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the smems of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/device.h>
  15 #include <linux/slab.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/of.h>
  18 #include <linux/of_irq.h>
  19 #include <linux/of_address.h>
  20 #include <linux/of_device.h>
  21 #include <linux/of_platform.h>
  22 #include "xillybus.h"
  23
  24 MODULE_DESCRIPTION("Xillybus driver for Open Firmware");
  25 MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
  26 MODULE_VERSION("1.06");
  27 MODULE_ALIAS("xillybus_of");
  28 MODULE_LICENSE("GPL v2");
  29
  30 static const char xillyname[] = "xillybus_of";
  31
  32 /* Match table for of_platform binding */
  33 static struct of_device_id xillybus_of_match[] = {
  34         { .compatible = "xlnx,xillybus-1.00.a", },
  35         {}
  36 };
  37
  38 MODULE_DEVICE_TABLE(of, xillybus_of_match);
  39
  40 static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep,
  41                                              dma_addr_t dma_handle,
  42                                              size_t size,
  43                                              int direction)
  44 {
  45         dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction);
  46 }
  47
  48 static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep,
  49                                                 dma_addr_t dma_handle,
  50                                                 size_t size,
  51                                                 int direction)
  52 {
  53         dma_sync_single_for_device(ep->dev, dma_handle, size, direction);
  54 }
  55
  56 static dma_addr_t xilly_map_single_of(struct xilly_cleanup *mem,
  57                                       struct xilly_endpoint *ep,
  58                                       void *ptr,
  59                                       size_t size,
  60                                       int direction
  61         )
  62 {
  63
  64         dma_addr_t addr = 0;
  65         struct xilly_dma *this;
  66
  67         this = kmalloc(sizeof(struct xilly_dma), GFP_KERNEL);
  68         if (!this)
  69                 return 0;
  70
  71         addr = dma_map_single(ep->dev, ptr, size, direction);
  72         this->direction = direction;
  73
  74         if (dma_mapping_error(ep->dev, addr)) {
  75                 kfree(this);
  76                 return 0;
  77         }
  78
  79         this->dma_addr = addr;
  80         this->dev = ep->dev;
  81         this->size = size;
  82
  83         list_add_tail(&this->node, &mem->to_unmap);
  84
  85         return addr;
  86 }
  87
  88 static void xilly_unmap_single_of(struct xilly_dma *entry)
  89 {
  90         dma_unmap_single(entry->dev,
  91                          entry->dma_addr,
  92                          entry->size,
  93                          entry->direction);
  94 }
  95
  96 static struct xilly_endpoint_hardware of_hw = {
  97         .owner = THIS_MODULE,
  98         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
  99         .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
 100         .map_single = xilly_map_single_of,
 101         .unmap_single = xilly_unmap_single_of
 102 };
 103
 104 static int xilly_drv_probe(struct platform_device *op)
 105 {
 106         struct device *dev = &op->dev;
 107         struct xilly_endpoint *endpoint;
 108         int rc = 0;
 109         int irq;
 110
 111         endpoint = xillybus_init_endpoint(NULL, dev, &of_hw);
 112
 113         if (!endpoint)
 114                 return -ENOMEM;
 115
 116         dev_set_drvdata(dev, endpoint);
 117
 118         rc = of_address_to_resource(dev->of_node, 0, &endpoint->res);
 119         if (rc) {
 120                 pr_warn("xillybus: Failed to obtain device tree "
 121                         "resource\n");
 122                 goto failed_request_regions;
 123         }
 124
 125         if  (!request_mem_region(endpoint->res.start,
 126                                  resource_size(&endpoint->res), xillyname)) {
 127                 pr_err("xillybus: request_mem_region failed. Aborting.\n");
 128                 rc = -EBUSY;
 129                 goto failed_request_regions;
 130         }
 131
 132         endpoint->registers = of_iomap(dev->of_node, 0);
 133
 134         if (!endpoint->registers) {
 135                 pr_err("xillybus: Failed to map I/O memory. Aborting.\n");
 136                 goto failed_iomap0;
 137         }
 138
 139         irq = irq_of_parse_and_map(dev->of_node, 0);
 140
 141         rc = request_irq(irq, xillybus_isr, 0, xillyname, endpoint);
 142
 143         if (rc) {
 144                 pr_err("xillybus: Failed to register IRQ handler. "
 145                        "Aborting.\n");
 146                 rc = -ENODEV;
 147                 goto failed_register_irq;
 148         }
 149
 150         rc = xillybus_endpoint_discovery(endpoint);
 151
 152         if (!rc)
 153                 return 0;
 154
 155         free_irq(irq, endpoint);
 156
 157 failed_register_irq:
 158         iounmap(endpoint->registers);
 159 failed_iomap0:
 160         release_mem_region(endpoint->res.start,
 161                            resource_size(&endpoint->res));
 162
 163 failed_request_regions:
 164         xillybus_do_cleanup(&endpoint->cleanup, endpoint);
 165
 166         kfree(endpoint);
 167         return rc;
 168 }
 169
 170 static int xilly_drv_remove(struct platform_device *op)
 171 {
 172         struct device *dev = &op->dev;
 173         struct xilly_endpoint *endpoint = dev_get_drvdata(dev);
 174         int irq = irq_of_parse_and_map(dev->of_node, 0);
 175
 176         xillybus_endpoint_remove(endpoint);
 177
 178         free_irq(irq, endpoint);
 179
 180         iounmap(endpoint->registers);
 181         release_mem_region(endpoint->res.start,
 182                            resource_size(&endpoint->res));
 183
 184         xillybus_do_cleanup(&endpoint->cleanup, endpoint);
 185
 186         kfree(endpoint);
 187
 188         return 0;
 189 }
 190
 191 static struct platform_driver xillybus_platform_driver = {
 192         .probe = xilly_drv_probe,
 193         .remove = xilly_drv_remove,
 194         .driver = {
 195                 .name = xillyname,
 196                 .owner = THIS_MODULE,
 197                 .of_match_table = xillybus_of_match,
 198         },
 199 };
 200
 201 static int __init xillybus_of_init(void)
 202 {
 203         return platform_driver_register(&xillybus_platform_driver);
 204 }
 205
 206 static void __exit xillybus_of_exit(void)
 207 {
 208         platform_driver_unregister(&xillybus_platform_driver);
 209 }
 210
 211 module_init(xillybus_of_init);
 212 module_exit(xillybus_of_exit);