[tip:x86/platform] x86/platform/intel-mid: Enable RTC on Intel Merrifield

[tip-bot for Andy Shevchenko <tipbot@zytor.com>]

Commit-ID:  de1c2540aa4f7796f31acf5432597bb0eb086250
Gitweb:     http://git.kernel.org/tip/de1c2540aa4f7796f31acf5432597bb0eb086250
Author:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>
AuthorDate: Fri, 13 Jan 2017 18:43:55 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Sat, 14 Jan 2017 08:30:45 +0100

x86/platform/intel-mid: Enable RTC on Intel Merrifield

Intel Merrifield has legacy RTC in contrast to the rest on Intel MID
platforms.

Set legacy RTC flag explicitly in architecture initialization code and
allocate interrupt for it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170113164355.66161-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/platform/intel-mid/mrfld.c |  1 +
 arch/x86/platform/intel-mid/sfi.c   | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/arch/x86/platform/intel-mid/mrfld.c b/arch/x86/platform/intel-mid/mrfld.c
index e0607c7..ae7bdeb 100644
--- a/arch/x86/platform/intel-mid/mrfld.c
+++ b/arch/x86/platform/intel-mid/mrfld.c
@@ -91,6 +91,7 @@ static unsigned long __init tangier_calibrate_tsc(void)
 static void __init tangier_arch_setup(void)
 {
 	x86_platform.calibrate_tsc = tangier_calibrate_tsc;
+	x86_platform.legacy.rtc = 1;
 }
 
 /* tangier arch ops */
diff --git a/arch/x86/platform/intel-mid/sfi.c b/arch/x86/platform/intel-mid/sfi.c
index 19b43e3..e4d4cab 100644
--- a/arch/x86/platform/intel-mid/sfi.c
+++ b/arch/x86/platform/intel-mid/sfi.c
@@ -41,6 +41,7 @@
 #include <asm/intel_scu_ipc.h>
 #include <asm/apb_timer.h>
 #include <asm/reboot.h>
+#include <asm/time.h>
 
 #define	SFI_SIG_OEM0	"OEM0"
 #define MAX_IPCDEVS	24
@@ -539,8 +540,21 @@ static int __init sfi_parse_devs(struct sfi_table_header *table)
 	return 0;
 }
 
+static int __init intel_mid_legacy_rtc_init(void)
+{
+	struct irq_alloc_info info;
+
+	if (!x86_platform.legacy.rtc)
+		return -ENODEV;
+
+	ioapic_set_alloc_attr(&info, NUMA_NO_NODE, 1, 0);
+	return mp_map_gsi_to_irq(RTC_IRQ, IOAPIC_MAP_ALLOC, &info);
+}
+
 static int __init intel_mid_platform_init(void)
 {
+	intel_mid_legacy_rtc_init();
+
 	sfi_table_parse(SFI_SIG_GPIO, NULL, NULL, sfi_parse_gpio);
 	sfi_table_parse(SFI_SIG_DEVS, NULL, NULL, sfi_parse_devs);
 	return 0;