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 = "xillybus,xillybus-1.00.a", },
  35         { .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */
  36         {}
  37 };
  38
  39 MODULE_DEVICE_TABLE(of, xillybus_of_match);
  40
  41 static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep,
  42                                              dma_addr_t dma_handle,
  43                                              size_t size,
  44                                              int direction)
  45 {
  46         dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction);
  47 }
  48
  49 static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep,
  50                                                 dma_addr_t dma_handle,
  51                                                 size_t size,
  52                                                 int direction)
  53 {
  54         dma_sync_single_for_device(ep->dev, dma_handle, size, direction);
  55 }
  56
  57 static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep,
  58                                       dma_addr_t dma_handle,
  59                                       size_t size,
  60                                       int direction)
  61 {
  62 }
  63
  64 static dma_addr_t xilly_map_single_of(struct xilly_cleanup *mem,
  65                                       struct xilly_endpoint *ep,
  66                                       void *ptr,
  67                                       size_t size,
  68                                       int direction
  69         )
  70 {
  71
  72         dma_addr_t addr = 0;
  73         struct xilly_dma *this;
  74
  75         this = kmalloc(sizeof(struct xilly_dma), GFP_KERNEL);
  76         if (!this)
  77                 return 0;
  78
  79         addr = dma_map_single(ep->dev, ptr, size, direction);
  80         this->direction = direction;
  81
  82         if (dma_mapping_error(ep->dev, addr)) {
  83                 kfree(this);
  84                 return 0;
  85         }
  86
  87         this->dma_addr = addr;
  88         this->dev = ep->dev;
  89         this->size = size;
  90
  91         list_add_tail(&this->node, &mem->to_unmap);
  92
  93         return addr;
  94 }
  95
  96 static void xilly_unmap_single_of(struct xilly_dma *entry)
  97 {
  98         dma_unmap_single(entry->dev,
  99                          entry->dma_addr,
 100                          entry->size,
 101                          entry->direction);
 102 }
 103
 104 static struct xilly_endpoint_hardware of_hw = {
 105         .owner = THIS_MODULE,
 106         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
 107         .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
 108         .map_single = xilly_map_single_of,
 109         .unmap_single = xilly_unmap_single_of
 110 };
 111
 112 static struct xilly_endpoint_hardware of_hw_coherent = {
 113         .owner = THIS_MODULE,
 114         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
 115         .hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
 116         .map_single = xilly_map_single_of,
 117         .unmap_single = xilly_unmap_single_of
 118 };
 119
 120 static int xilly_drv_probe(struct platform_device *op)
 121 {
 122         struct device *dev = &op->dev;
 123         struct xilly_endpoint *endpoint;
 124         int rc = 0;
 125         int irq;
 126         struct xilly_endpoint_hardware *ephw = &of_hw;
 127
 128         if (of_property_read_bool(dev->of_node, "dma-coherent"))
 129                 ephw = &of_hw_coherent;
 130
 131         endpoint = xillybus_init_endpoint(NULL, dev, ephw);
 132
 133         if (!endpoint)
 134                 return -ENOMEM;
 135
 136         dev_set_drvdata(dev, endpoint);
 137
 138         rc = of_address_to_resource(dev->of_node, 0, &endpoint->res);
 139         if (rc) {
 140                 dev_warn(endpoint->dev,
 141                          "Failed to obtain device tree resource\n");
 142                 goto failed_request_regions;
 143         }
 144
 145         if  (!request_mem_region(endpoint->res.start,
 146                                  resource_size(&endpoint->res), xillyname)) {
 147                 dev_err(endpoint->dev,
 148                         "request_mem_region failed. Aborting.\n");
 149                 rc = -EBUSY;
 150                 goto failed_request_regions;
 151         }
 152
 153         endpoint->registers = of_iomap(dev->of_node, 0);
 154         if (!endpoint->registers) {
 155                 dev_err(endpoint->dev,
 156                         "Failed to map I/O memory. Aborting.\n");
 157                 rc = -EIO;
 158                 goto failed_iomap0;
 159         }
 160
 161         irq = irq_of_parse_and_map(dev->of_node, 0);
 162
 163         rc = request_irq(irq, xillybus_isr, 0, xillyname, endpoint);
 164
 165         if (rc) {
 166                 dev_err(endpoint->dev,
 167                         "Failed to register IRQ handler. Aborting.\n");
 168                 rc = -ENODEV;
 169                 goto failed_register_irq;
 170         }
 171
 172         rc = xillybus_endpoint_discovery(endpoint);
 173
 174         if (!rc)
 175                 return 0;
 176
 177         free_irq(irq, endpoint);
 178
 179 failed_register_irq:
 180         iounmap(endpoint->registers);
 181 failed_iomap0:
 182         release_mem_region(endpoint->res.start,
 183                            resource_size(&endpoint->res));
 184
 185 failed_request_regions:
 186         xillybus_do_cleanup(&endpoint->cleanup, endpoint);
 187
 188         kfree(endpoint);
 189         return rc;
 190 }
 191
 192 static int xilly_drv_remove(struct platform_device *op)
 193 {
 194         struct device *dev = &op->dev;
 195         struct xilly_endpoint *endpoint = dev_get_drvdata(dev);
 196         int irq = irq_of_parse_and_map(dev->of_node, 0);
 197
 198         xillybus_endpoint_remove(endpoint);
 199
 200         free_irq(irq, endpoint);
 201
 202         iounmap(endpoint->registers);
 203         release_mem_region(endpoint->res.start,
 204                            resource_size(&endpoint->res));
 205
 206         xillybus_do_cleanup(&endpoint->cleanup, endpoint);
 207
 208         kfree(endpoint);
 209
 210         return 0;
 211 }
 212
 213 static struct platform_driver xillybus_platform_driver = {
 214         .probe = xilly_drv_probe,
 215         .remove = xilly_drv_remove,
 216         .driver = {
 217                 .name = xillyname,
 218                 .owner = THIS_MODULE,
 219                 .of_match_table = xillybus_of_match,
 220         },
 221 };
 222
 223 module_platform_driver(xillybus_platform_driver);