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Linux/arch/arm/mach-mxs/devices.c

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  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 int __init mxs_add_amba_device(const struct amba_device *dev)
 79 {
 80         struct amba_device *adev = kmalloc(sizeof(*adev), GFP_KERNEL);
 81 
 82         if (!adev) {
 83                 pr_err("%s: failed to allocate memory", __func__);
 84                 return -ENOMEM;
 85         }
 86 
 87         *adev = *dev;
 88 
 89         return amba_device_register(adev, &iomem_resource);
 90 }
 91 
 92 struct device mxs_apbh_bus = {
 93         .init_name      = "mxs_apbh",
 94         .parent         = &platform_bus,
 95 };
 96 
 97 static int __init mxs_device_init(void)
 98 {
 99         return device_register(&mxs_apbh_bus);
100 }
101 core_initcall(mxs_device_init);
102 

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