target/linux/ubicom32/files/arch/ubicom32/mach-common/vdc_tio.c

   1 /*
   2  * arch/ubicom32/mach-common/vdc_tio.c
   3  *   Generic initialization for VDC
   4  *
   5  * (C) Copyright 2009, Ubicom, Inc.
   6  *
   7  * This file is part of the Ubicom32 Linux Kernel Port.
   8  *
   9  * The Ubicom32 Linux Kernel Port is free software: you can redistribute
  10  * it and/or modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation, either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * The Ubicom32 Linux Kernel Port is distributed in the hope that it
  15  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  16  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  * the GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with the Ubicom32 Linux Kernel Port.  If not,
  21  * see <http://www.gnu.org/licenses/>.
  22  *
  23  * Ubicom32 implementation derived from (with many thanks):
  24  *   arch/m68knommu
  25  *   arch/blackfin
  26  *   arch/parisc
  27  */
  28
  29 #include <linux/platform_device.h>
  30 #include <linux/types.h>
  31
  32 #include <asm/devtree.h>
  33 #include <asm/vdc_tio.h>
  34
  35 /*
  36  * Resources that this driver uses
  37  */
  38 static struct resource vdc_tio_resources[] = {
  39         /*
  40          * Send IRQ
  41          */
  42         [0] = {
  43                 /*
  44                  * The init routine will query the devtree and fill this in
  45                  */
  46                 .flags  = IORESOURCE_IRQ,
  47         },
  48
  49         /*
  50          * Receive IRQ (optional)
  51          */
  52         [1] = {
  53                 /*
  54                  * The init routine will query the devtree and fill this in
  55                  */
  56                 .flags  = IORESOURCE_IRQ,
  57         },
  58
  59         /*
  60          * Memory Mapped Registers
  61          */
  62         [2] = {
  63                 /*
  64                  * The init routine will query the devtree and fill this in
  65                  */
  66                 .flags  = IORESOURCE_MEM,
  67         },
  68 };
  69
  70 /*
  71  * The platform_device structure which is passed to the driver
  72  */
  73 static struct platform_device vdc_tio_platform_device = {
  74         .name           = "ubicom32fb",
  75         .id             = -1,
  76         .resource       = vdc_tio_resources,
  77         .num_resources  = ARRAY_SIZE(vdc_tio_resources),
  78 };
  79
  80 /*
  81  * vdc_tio_init
  82  *      Checks the device tree and instantiates the driver if found
  83  */
  84 void __init vdc_tio_init(void)
  85 {
  86         /*
  87          * Check the device tree for the vdc_tio
  88          */
  89         struct vdc_tio_node *vdc_node =
  90                 (struct vdc_tio_node *)devtree_find_node("vdctio");
  91         if (!vdc_node) {
  92                 printk(KERN_WARNING "No vdc_tio found\n");
  93                 return;
  94         }
  95
  96         /*
  97          * Fill in the resources and platform data from devtree information
  98          */
  99         vdc_tio_resources[0].start = vdc_node->dn.sendirq;
 100         vdc_tio_resources[1].start = vdc_node->dn.recvirq;
 101         vdc_tio_resources[2].start = (u32_t)vdc_node->regs;
 102         vdc_tio_resources[2].end = (u32_t)vdc_node->regs +
 103                 sizeof(struct vdc_tio_vp_regs);
 104
 105         /*
 106          * Try to get the device registered
 107          */
 108         if (platform_device_register(&vdc_tio_platform_device) < 0) {
 109                 printk(KERN_WARNING "VDC failed to register\n");
 110         }
 111 }