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 <linux/err.h>
  23 #include "xillybus.h"
  24
  25 MODULE_DESCRIPTION("Xillybus driver for Open Firmware");
  26 MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
  27 MODULE_VERSION("1.06");
  28 MODULE_ALIAS("xillybus_of");
  29 MODULE_LICENSE("GPL v2");
  30
  31 static const char xillyname[] = "xillybus_of";
  32
  33 /* Match table for of_platform binding */
  34 static struct of_device_id xillybus_of_match[] = {
  35         { .compatible = "xillybus,xillybus-1.00.a", },
  36         { .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */
  37         {}
  38 };
  39
  40 MODULE_DEVICE_TABLE(of, xillybus_of_match);
  41
  42 static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep,
  43                                              dma_addr_t dma_handle,
  44                                              size_t size,
  45                                              int direction)
  46 {
  47         dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction);
  48 }
  49
  50 static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep,
  51                                                 dma_addr_t dma_handle,
  52                                                 size_t size,
  53                                                 int direction)
  54 {
  55         dma_sync_single_for_device(ep->dev, dma_handle, size, direction);
  56 }
  57
  58 static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep,
  59                                       dma_addr_t dma_handle,
  60                                       size_t size,
  61                                       int direction)
  62 {
  63 }
  64
  65 static dma_addr_t xilly_map_single_of(struct xilly_cleanup *mem,
  66                                       struct xilly_endpoint *ep,
  67                                       void *ptr,
  68                                       size_t size,
  69                                       int direction
  70         )
  71 {
  72
  73         dma_addr_t addr = 0;
  74         struct xilly_dma *this;
  75
  76         this = kmalloc(sizeof(struct xilly_dma), GFP_KERNEL);
  77         if (!this)
  78                 return 0;
  79
  80         addr = dma_map_single(ep->dev, ptr, size, direction);
  81         this->direction = direction;
  82
  83         if (dma_mapping_error(ep->dev, addr)) {
  84                 kfree(this);
  85                 return 0;
  86         }
  87
  88         this->dma_addr = addr;
  89         this->dev = ep->dev;
  90         this->size = size;
  91
  92         list_add_tail(&this->node, &mem->to_unmap);
  93
  94         return addr;
  95 }
  96
  97 static void xilly_unmap_single_of(struct xilly_dma *entry)
  98 {
  99         dma_unmap_single(entry->dev,
 100                          entry->dma_addr,
 101                          entry->size,
 102                          entry->direction);
 103 }
 104
 105 static struct xilly_endpoint_hardware of_hw = {
 106         .owner = THIS_MODULE,
 107         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
 108         .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
 109         .map_single = xilly_map_single_of,
 110         .unmap_single = xilly_unmap_single_of
 111 };
 112
 113 static struct xilly_endpoint_hardware of_hw_coherent = {
 114         .owner = THIS_MODULE,
 115         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
 116         .hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
 117         .map_single = xilly_map_single_of,
 118         .unmap_single = xilly_unmap_single_of
 119 };
 120
 121 static int xilly_drv_probe(struct platform_device *op)
 122 {
 123         struct device *dev = &op->dev;
 124         struct xilly_endpoint *endpoint;
 125         int rc = 0;
 126         int irq;
 127         struct resource res;
 128         struct xilly_endpoint_hardware *ephw = &of_hw;
 129
 130         if (of_property_read_bool(dev->of_node, "dma-coherent"))
 131                 ephw = &of_hw_coherent;
 132
 133         endpoint = xillybus_init_endpoint(NULL, dev, ephw);
 134
 135         if (!endpoint)
 136                 return -ENOMEM;
 137
 138         dev_set_drvdata(dev, endpoint);
 139
 140         rc = of_address_to_resource(dev->of_node, 0, &res);
 141         if (rc) {
 142                 dev_warn(endpoint->dev,
 143                          "Failed to obtain device tree resource\n");
 144                 return rc;
 145         }
 146
 147         endpoint->registers = devm_ioremap_resource(dev, &res);
 148
 149         if (IS_ERR(endpoint->registers))
 150                 return PTR_ERR(endpoint->registers);
 151
 152         irq = irq_of_parse_and_map(dev->of_node, 0);
 153
 154         rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint);
 155
 156         if (rc) {
 157                 dev_err(endpoint->dev,
 158                         "Failed to register IRQ handler. Aborting.\n");
 159                 return -ENODEV;
 160         }
 161
 162         rc = xillybus_endpoint_discovery(endpoint);
 163
 164         if (!rc)
 165                 return 0;
 166
 167         xillybus_do_cleanup(&endpoint->cleanup, endpoint);
 168
 169         return rc;
 170 }
 171
 172 static int xilly_drv_remove(struct platform_device *op)
 173 {
 174         struct device *dev = &op->dev;
 175         struct xilly_endpoint *endpoint = dev_get_drvdata(dev);
 176
 177         xillybus_endpoint_remove(endpoint);
 178
 179         xillybus_do_cleanup(&endpoint->cleanup, endpoint);
 180
 181         return 0;
 182 }
 183
 184 static struct platform_driver xillybus_platform_driver = {
 185         .probe = xilly_drv_probe,
 186         .remove = xilly_drv_remove,
 187         .driver = {
 188                 .name = xillyname,
 189                 .owner = THIS_MODULE,
 190                 .of_match_table = xillybus_of_match,
 191         },
 192 };
 193
 194 module_platform_driver(xillybus_platform_driver);