drivers/char/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 const 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 void xilly_of_unmap(void *ptr)
  66 {
  67         struct xilly_mapping *data = ptr;
  68
  69         dma_unmap_single(data->device, data->dma_addr,
  70                          data->size, data->direction);
  71
  72         kfree(ptr);
  73 }
  74
  75 static int xilly_map_single_of(struct xilly_endpoint *ep,
  76                                void *ptr,
  77                                size_t size,
  78                                int direction,
  79                                dma_addr_t *ret_dma_handle
  80         )
  81 {
  82         dma_addr_t addr;
  83         struct xilly_mapping *this;
  84         int rc;
  85
  86         this = kzalloc(sizeof(*this), GFP_KERNEL);
  87         if (!this)
  88                 return -ENOMEM;
  89
  90         addr = dma_map_single(ep->dev, ptr, size, direction);
  91
  92         if (dma_mapping_error(ep->dev, addr)) {
  93                 kfree(this);
  94                 return -ENODEV;
  95         }
  96
  97         this->device = ep->dev;
  98         this->dma_addr = addr;
  99         this->size = size;
 100         this->direction = direction;
 101
 102         *ret_dma_handle = addr;
 103
 104         rc = devm_add_action(ep->dev, xilly_of_unmap, this);
 105
 106         if (rc) {
 107                 dma_unmap_single(ep->dev, addr, size, direction);
 108                 kfree(this);
 109                 return rc;
 110         }
 111
 112         return 0;
 113 }
 114
 115 static struct xilly_endpoint_hardware of_hw = {
 116         .owner = THIS_MODULE,
 117         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
 118         .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
 119         .map_single = xilly_map_single_of,
 120 };
 121
 122 static struct xilly_endpoint_hardware of_hw_coherent = {
 123         .owner = THIS_MODULE,
 124         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
 125         .hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
 126         .map_single = xilly_map_single_of,
 127 };
 128
 129 static int xilly_drv_probe(struct platform_device *op)
 130 {
 131         struct device *dev = &op->dev;
 132         struct xilly_endpoint *endpoint;
 133         int rc;
 134         int irq;
 135         struct resource res;
 136         struct xilly_endpoint_hardware *ephw = &of_hw;
 137
 138         if (of_property_read_bool(dev->of_node, "dma-coherent"))
 139                 ephw = &of_hw_coherent;
 140
 141         endpoint = xillybus_init_endpoint(NULL, dev, ephw);
 142
 143         if (!endpoint)
 144                 return -ENOMEM;
 145
 146         dev_set_drvdata(dev, endpoint);
 147
 148         rc = of_address_to_resource(dev->of_node, 0, &res);
 149         endpoint->registers = devm_ioremap_resource(dev, &res);
 150
 151         if (IS_ERR(endpoint->registers))
 152                 return PTR_ERR(endpoint->registers);
 153
 154         irq = irq_of_parse_and_map(dev->of_node, 0);
 155
 156         rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint);
 157
 158         if (rc) {
 159                 dev_err(endpoint->dev,
 160                         "Failed to register IRQ handler. Aborting.\n");
 161                 return -ENODEV;
 162         }
 163
 164         return xillybus_endpoint_discovery(endpoint);
 165 }
 166
 167 static int xilly_drv_remove(struct platform_device *op)
 168 {
 169         struct device *dev = &op->dev;
 170         struct xilly_endpoint *endpoint = dev_get_drvdata(dev);
 171
 172         xillybus_endpoint_remove(endpoint);
 173
 174         return 0;
 175 }
 176
 177 static struct platform_driver xillybus_platform_driver = {
 178         .probe = xilly_drv_probe,
 179         .remove = xilly_drv_remove,
 180         .driver = {
 181                 .name = xillyname,
 182                 .of_match_table = xillybus_of_match,
 183         },
 184 };
 185
 186 module_platform_driver(xillybus_platform_driver);