arch/arm/mach-mxs/devices.c

   1 /*
   2  * Copyright 2008 Sascha Hauer, kernel@pengutronix.de
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor,
  16  * Boston, MA  02110-1301, USA.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/slab.h>
  21 #include <linux/init.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/amba/bus.h>
  24
  25 struct platform_device *__init mxs_add_platform_device_dmamask(
  26                 const char *name, int id,
  27                 const struct resource *res, unsigned int num_resources,
  28                 const void *data, size_t size_data, u64 dmamask)
  29 {
  30         int ret = -ENOMEM;
  31         struct platform_device *pdev;
  32
  33         pdev = platform_device_alloc(name, id);
  34         if (!pdev)
  35                 goto err;
  36
  37         if (dmamask) {
  38                 /*
  39                  * This memory isn't freed when the device is put,
  40                  * I don't have a nice idea for that though.  Conceptually
  41                  * dma_mask in struct device should not be a pointer.
  42                  * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
  43                  */
  44                 pdev->dev.dma_mask =
  45                         kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
  46                 if (!pdev->dev.dma_mask)
  47                         /* ret is still -ENOMEM; */
  48                         goto err;
  49
  50                 *pdev->dev.dma_mask = dmamask;
  51                 pdev->dev.coherent_dma_mask = dmamask;
  52         }
  53
  54         if (res) {
  55                 ret = platform_device_add_resources(pdev, res, num_resources);
  56                 if (ret)
  57                         goto err;
  58         }
  59
  60         if (data) {
  61                 ret = platform_device_add_data(pdev, data, size_data);
  62                 if (ret)
  63                         goto err;
  64         }
  65
  66         ret = platform_device_add(pdev);
  67         if (ret) {
  68 err:
  69                 if (dmamask)
  70                         kfree(pdev->dev.dma_mask);
  71                 platform_device_put(pdev);
  72                 return ERR_PTR(ret);
  73         }
  74
  75         return pdev;
  76 }
  77
  78 struct device mxs_apbh_bus = {
  79         .init_name      = "mxs_apbh",
  80         .parent         = &platform_bus,
  81 };
  82
  83 static int __init mxs_device_init(void)
  84 {
  85         return device_register(&mxs_apbh_bus);
  86 }
  87 core_initcall(mxs_device_init);