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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * platform_msic.c: MSIC platform data initialization file
   4  *
   5  * (C) Copyright 2013 Intel Corporation
   6  * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/scatterlist.h>
  12 #include <linux/init.h>
  13 #include <linux/sfi.h>
  14 #include <linux/mfd/intel_msic.h>
  15 #include <asm/intel_scu_ipc.h>
  16 #include <asm/intel-mid.h>
  17 #include "platform_msic.h"
  18
  19 struct intel_msic_platform_data msic_pdata;
  20
  21 static struct resource msic_resources[] = {
  22         {
  23                 .start  = INTEL_MSIC_IRQ_PHYS_BASE,
  24                 .end    = INTEL_MSIC_IRQ_PHYS_BASE + 64 - 1,
  25                 .flags  = IORESOURCE_MEM,
  26         },
  27 };
  28
  29 static struct platform_device msic_device = {
  30         .name           = "intel_msic",
  31         .id             = -1,
  32         .dev            = {
  33                 .platform_data  = &msic_pdata,
  34         },
  35         .num_resources  = ARRAY_SIZE(msic_resources),
  36         .resource       = msic_resources,
  37 };
  38
  39 static int msic_scu_status_change(struct notifier_block *nb,
  40                                   unsigned long code, void *data)
  41 {
  42         if (code == SCU_DOWN) {
  43                 platform_device_unregister(&msic_device);
  44                 return 0;
  45         }
  46
  47         return platform_device_register(&msic_device);
  48 }
  49
  50 static int __init msic_init(void)
  51 {
  52         static struct notifier_block msic_scu_notifier = {
  53                 .notifier_call  = msic_scu_status_change,
  54         };
  55
  56         /*
  57          * We need to be sure that the SCU IPC is ready before MSIC device
  58          * can be registered.
  59          */
  60         if (intel_mid_has_msic())
  61                 intel_scu_notifier_add(&msic_scu_notifier);
  62
  63         return 0;
  64 }
  65 arch_initcall(msic_init);
  66
  67 /*
  68  * msic_generic_platform_data - sets generic platform data for the block
  69  * @info: pointer to the SFI device table entry for this block
  70  * @block: MSIC block
  71  *
  72  * Function sets IRQ number from the SFI table entry for given device to
  73  * the MSIC platform data.
  74  */
  75 void *msic_generic_platform_data(void *info, enum intel_msic_block block)
  76 {
  77         struct sfi_device_table_entry *entry = info;
  78
  79         BUG_ON(block < 0 || block >= INTEL_MSIC_BLOCK_LAST);
  80         msic_pdata.irq[block] = entry->irq;
  81
  82         return NULL;
  83 }