root/arch/x86/platform/intel-mid/device_libs/platform_mrfld_rtc.c

DEFINITIONS

1. mrfld_legacy_rtc_alloc_irq
2. mrfld_legacy_rtc_init

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel Merrifield legacy RTC initialization file
   4  *
   5  * (C) Copyright 2017 Intel Corporation
   6  *
   7  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   8  */
   9 
  10 #include <linux/init.h>
  11 
  12 #include <asm/hw_irq.h>
  13 #include <asm/intel-mid.h>
  14 #include <asm/io_apic.h>
  15 #include <asm/time.h>
  16 #include <asm/x86_init.h>
  17 
  18 static int __init mrfld_legacy_rtc_alloc_irq(void)
  19 {
  20         struct irq_alloc_info info;
  21         int ret;
  22 
  23         if (!x86_platform.legacy.rtc)
  24                 return -ENODEV;
  25 
  26         ioapic_set_alloc_attr(&info, NUMA_NO_NODE, 1, 0);
  27         ret = mp_map_gsi_to_irq(RTC_IRQ, IOAPIC_MAP_ALLOC, &info);
  28         if (ret < 0) {
  29                 pr_info("Failed to allocate RTC interrupt. Disabling RTC\n");
  30                 x86_platform.legacy.rtc = 0;
  31                 return ret;
  32         }
  33 
  34         return 0;
  35 }
  36 
  37 static int __init mrfld_legacy_rtc_init(void)
  38 {
  39         if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER)
  40                 return -ENODEV;
  41 
  42         return mrfld_legacy_rtc_alloc_irq();
  43 }
  44 arch_initcall(mrfld_legacy_rtc_init);