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/err.h>
  19 #include "xillybus.h"
  20
  21 MODULE_DESCRIPTION("Xillybus driver for Open Firmware");
  22 MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
  23 MODULE_VERSION("1.06");
  24 MODULE_ALIAS("xillybus_of");
  25 MODULE_LICENSE("GPL v2");
  26
  27 static const char xillyname[] = "xillybus_of";
  28
  29 /* Match table for of_platform binding */
  30 static const struct of_device_id xillybus_of_match[] = {
  31         { .compatible = "xillybus,xillybus-1.00.a", },
  32         { .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */
  33         {}
  34 };
  35
  36 MODULE_DEVICE_TABLE(of, xillybus_of_match);
  37
  38 static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep,
  39                                              dma_addr_t dma_handle,
  40                                              size_t size,
  41                                              int direction)
  42 {
  43         dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction);
  44 }
  45
  46 static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep,
  47                                                 dma_addr_t dma_handle,
  48                                                 size_t size,
  49                                                 int direction)
  50 {
  51         dma_sync_single_for_device(ep->dev, dma_handle, size, direction);
  52 }
  53
  54 static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep,
  55                                       dma_addr_t dma_handle,
  56                                       size_t size,
  57                                       int direction)
  58 {
  59 }
  60
  61 static void xilly_of_unmap(void *ptr)
  62 {
  63         struct xilly_mapping *data = ptr;
  64
  65         dma_unmap_single(data->device, data->dma_addr,
  66                          data->size, data->direction);
  67
  68         kfree(ptr);
  69 }
  70
  71 static int xilly_map_single_of(struct xilly_endpoint *ep,
  72                                void *ptr,
  73                                size_t size,
  74                                int direction,
  75                                dma_addr_t *ret_dma_handle
  76         )
  77 {
  78         dma_addr_t addr;
  79         struct xilly_mapping *this;
  80
  81         this = kzalloc(sizeof(*this), GFP_KERNEL);
  82         if (!this)
  83                 return -ENOMEM;
  84
  85         addr = dma_map_single(ep->dev, ptr, size, direction);
  86
  87         if (dma_mapping_error(ep->dev, addr)) {
  88                 kfree(this);
  89                 return -ENODEV;
  90         }
  91
  92         this->device = ep->dev;
  93         this->dma_addr = addr;
  94         this->size = size;
  95         this->direction = direction;
  96
  97         *ret_dma_handle = addr;
  98
  99         return devm_add_action_or_reset(ep->dev, xilly_of_unmap, this);
 100 }
 101
 102 static struct xilly_endpoint_hardware of_hw = {
 103         .owner = THIS_MODULE,
 104         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
 105         .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
 106         .map_single = xilly_map_single_of,
 107 };
 108
 109 static struct xilly_endpoint_hardware of_hw_coherent = {
 110         .owner = THIS_MODULE,
 111         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
 112         .hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
 113         .map_single = xilly_map_single_of,
 114 };
 115
 116 static int xilly_drv_probe(struct platform_device *op)
 117 {
 118         struct device *dev = &op->dev;
 119         struct xilly_endpoint *endpoint;
 120         int rc;
 121         int irq;
 122         struct resource *res;
 123         struct xilly_endpoint_hardware *ephw = &of_hw;
 124
 125         if (of_property_read_bool(dev->of_node, "dma-coherent"))
 126                 ephw = &of_hw_coherent;
 127
 128         endpoint = xillybus_init_endpoint(NULL, dev, ephw);
 129
 130         if (!endpoint)
 131                 return -ENOMEM;
 132
 133         dev_set_drvdata(dev, endpoint);
 134
 135         res = platform_get_resource(op, IORESOURCE_MEM, 0);
 136         endpoint->registers = devm_ioremap_resource(dev, res);
 137
 138         if (IS_ERR(endpoint->registers))
 139                 return PTR_ERR(endpoint->registers);
 140
 141         irq = platform_get_irq(op, 0);
 142
 143         rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint);
 144
 145         if (rc) {
 146                 dev_err(endpoint->dev,
 147                         "Failed to register IRQ handler. Aborting.\n");
 148                 return -ENODEV;
 149         }
 150
 151         return xillybus_endpoint_discovery(endpoint);
 152 }
 153
 154 static int xilly_drv_remove(struct platform_device *op)
 155 {
 156         struct device *dev = &op->dev;
 157         struct xilly_endpoint *endpoint = dev_get_drvdata(dev);
 158
 159         xillybus_endpoint_remove(endpoint);
 160
 161         return 0;
 162 }
 163
 164 static struct platform_driver xillybus_platform_driver = {
 165         .probe = xilly_drv_probe,
 166         .remove = xilly_drv_remove,
 167         .driver = {
 168                 .name = xillyname,
 169                 .of_match_table = xillybus_of_match,
 170         },
 171 };
 172
 173 module_platform_driver(xillybus_platform_driver);