drivers/char/xillybus/xillybus_of.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/drivers/misc/xillybus_of.c
   4  *
   5  * Copyright 2011 Xillybus Ltd, http://xillybus.com
   6  *
   7  * Driver for the Xillybus FPGA/host framework using Open Firmware.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/device.h>
  12 #include <linux/slab.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/of.h>
  15 #include <linux/err.h>
  16 #include "xillybus.h"
  17
  18 MODULE_DESCRIPTION("Xillybus driver for Open Firmware");
  19 MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
  20 MODULE_VERSION("1.06");
  21 MODULE_ALIAS("xillybus_of");
  22 MODULE_LICENSE("GPL v2");
  23
  24 static const char xillyname[] = "xillybus_of";
  25
  26 /* Match table for of_platform binding */
  27 static const struct of_device_id xillybus_of_match[] = {
  28         { .compatible = "xillybus,xillybus-1.00.a", },
  29         { .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */
  30         {}
  31 };
  32
  33 MODULE_DEVICE_TABLE(of, xillybus_of_match);
  34
  35 static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep,
  36                                              dma_addr_t dma_handle,
  37                                              size_t size,
  38                                              int direction)
  39 {
  40         dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction);
  41 }
  42
  43 static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep,
  44                                                 dma_addr_t dma_handle,
  45                                                 size_t size,
  46                                                 int direction)
  47 {
  48         dma_sync_single_for_device(ep->dev, dma_handle, size, direction);
  49 }
  50
  51 static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep,
  52                                       dma_addr_t dma_handle,
  53                                       size_t size,
  54                                       int direction)
  55 {
  56 }
  57
  58 static void xilly_of_unmap(void *ptr)
  59 {
  60         struct xilly_mapping *data = ptr;
  61
  62         dma_unmap_single(data->device, data->dma_addr,
  63                          data->size, data->direction);
  64
  65         kfree(ptr);
  66 }
  67
  68 static int xilly_map_single_of(struct xilly_endpoint *ep,
  69                                void *ptr,
  70                                size_t size,
  71                                int direction,
  72                                dma_addr_t *ret_dma_handle
  73         )
  74 {
  75         dma_addr_t addr;
  76         struct xilly_mapping *this;
  77
  78         this = kzalloc(sizeof(*this), GFP_KERNEL);
  79         if (!this)
  80                 return -ENOMEM;
  81
  82         addr = dma_map_single(ep->dev, ptr, size, direction);
  83
  84         if (dma_mapping_error(ep->dev, addr)) {
  85                 kfree(this);
  86                 return -ENODEV;
  87         }
  88
  89         this->device = ep->dev;
  90         this->dma_addr = addr;
  91         this->size = size;
  92         this->direction = direction;
  93
  94         *ret_dma_handle = addr;
  95
  96         return devm_add_action_or_reset(ep->dev, xilly_of_unmap, this);
  97 }
  98
  99 static struct xilly_endpoint_hardware of_hw = {
 100         .owner = THIS_MODULE,
 101         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
 102         .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
 103         .map_single = xilly_map_single_of,
 104 };
 105
 106 static struct xilly_endpoint_hardware of_hw_coherent = {
 107         .owner = THIS_MODULE,
 108         .hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
 109         .hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
 110         .map_single = xilly_map_single_of,
 111 };
 112
 113 static int xilly_drv_probe(struct platform_device *op)
 114 {
 115         struct device *dev = &op->dev;
 116         struct xilly_endpoint *endpoint;
 117         int rc;
 118         int irq;
 119         struct resource *res;
 120         struct xilly_endpoint_hardware *ephw = &of_hw;
 121
 122         if (of_property_read_bool(dev->of_node, "dma-coherent"))
 123                 ephw = &of_hw_coherent;
 124
 125         endpoint = xillybus_init_endpoint(NULL, dev, ephw);
 126
 127         if (!endpoint)
 128                 return -ENOMEM;
 129
 130         dev_set_drvdata(dev, endpoint);
 131
 132         res = platform_get_resource(op, IORESOURCE_MEM, 0);
 133         endpoint->registers = devm_ioremap_resource(dev, res);
 134
 135         if (IS_ERR(endpoint->registers))
 136                 return PTR_ERR(endpoint->registers);
 137
 138         irq = platform_get_irq(op, 0);
 139
 140         rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint);
 141
 142         if (rc) {
 143                 dev_err(endpoint->dev,
 144                         "Failed to register IRQ handler. Aborting.\n");
 145                 return -ENODEV;
 146         }
 147
 148         return xillybus_endpoint_discovery(endpoint);
 149 }
 150
 151 static int xilly_drv_remove(struct platform_device *op)
 152 {
 153         struct device *dev = &op->dev;
 154         struct xilly_endpoint *endpoint = dev_get_drvdata(dev);
 155
 156         xillybus_endpoint_remove(endpoint);
 157
 158         return 0;
 159 }
 160
 161 static struct platform_driver xillybus_platform_driver = {
 162         .probe = xilly_drv_probe,
 163         .remove = xilly_drv_remove,
 164         .driver = {
 165                 .name = xillyname,
 166                 .of_match_table = xillybus_of_match,
 167         },
 168 };
 169
 170 module_platform_driver(xillybus_platform_driver);