arch/x86/platform/intel-mid/device_libs/platform_msic.c

   1 /*
   2  * platform_msic.c: MSIC platform data initialization file
   3  *
   4  * (C) Copyright 2013 Intel Corporation
   5  * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; version 2
  10  * of the License.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/scatterlist.h>
  16 #include <linux/init.h>
  17 #include <linux/sfi.h>
  18 #include <linux/mfd/intel_msic.h>
  19 #include <asm/intel_scu_ipc.h>
  20 #include <asm/intel-mid.h>
  21 #include "platform_msic.h"
  22
  23 struct intel_msic_platform_data msic_pdata;
  24
  25 static struct resource msic_resources[] = {
  26         {
  27                 .start  = INTEL_MSIC_IRQ_PHYS_BASE,
  28                 .end    = INTEL_MSIC_IRQ_PHYS_BASE + 64 - 1,
  29                 .flags  = IORESOURCE_MEM,
  30         },
  31 };
  32
  33 static struct platform_device msic_device = {
  34         .name           = "intel_msic",
  35         .id             = -1,
  36         .dev            = {
  37                 .platform_data  = &msic_pdata,
  38         },
  39         .num_resources  = ARRAY_SIZE(msic_resources),
  40         .resource       = msic_resources,
  41 };
  42
  43 static int msic_scu_status_change(struct notifier_block *nb,
  44                                   unsigned long code, void *data)
  45 {
  46         if (code == SCU_DOWN) {
  47                 platform_device_unregister(&msic_device);
  48                 return 0;
  49         }
  50
  51         return platform_device_register(&msic_device);
  52 }
  53
  54 static int __init msic_init(void)
  55 {
  56         static struct notifier_block msic_scu_notifier = {
  57                 .notifier_call  = msic_scu_status_change,
  58         };
  59
  60         /*
  61          * We need to be sure that the SCU IPC is ready before MSIC device
  62          * can be registered.
  63          */
  64         if (intel_mid_has_msic())
  65                 intel_scu_notifier_add(&msic_scu_notifier);
  66
  67         return 0;
  68 }
  69 arch_initcall(msic_init);
  70
  71 /*
  72  * msic_generic_platform_data - sets generic platform data for the block
  73  * @info: pointer to the SFI device table entry for this block
  74  * @block: MSIC block
  75  *
  76  * Function sets IRQ number from the SFI table entry for given device to
  77  * the MSIC platform data.
  78  */
  79 void *msic_generic_platform_data(void *info, enum intel_msic_block block)
  80 {
  81         struct sfi_device_table_entry *entry = info;
  82
  83         BUG_ON(block < 0 || block >= INTEL_MSIC_BLOCK_LAST);
  84         msic_pdata.irq[block] = entry->irq;
  85
  86         return NULL;
  87 }