summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-at91/sysirq_mask.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-at91/sysirq_mask.c')
-rw-r--r--arch/arm/mach-at91/sysirq_mask.c75
1 files changed, 0 insertions, 75 deletions
diff --git a/arch/arm/mach-at91/sysirq_mask.c b/arch/arm/mach-at91/sysirq_mask.c
deleted file mode 100644
index f8bc3511a8c8..000000000000
--- a/arch/arm/mach-at91/sysirq_mask.c
+++ /dev/null
@@ -1,75 +0,0 @@
-/*
- * sysirq_mask.c - System-interrupt masking
- *
- * Copyright (C) 2013 Johan Hovold <jhovold@gmail.com>
- *
- * Functions to disable system interrupts from backup-powered peripherals.
- *
- * The RTC and RTT-peripherals are generally powered by backup power (VDDBU)
- * and are not reset on wake-up, user, watchdog or software reset. This means
- * that their interrupts may be enabled during early boot (e.g. after a user
- * reset).
- *
- * As the RTC and RTT share the system-interrupt line with the PIT, an
- * interrupt occurring before a handler has been installed would lead to the
- * system interrupt being disabled and prevent the system from booting.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include <linux/io.h>
-#include <mach/at91_rtt.h>
-
-#include "generic.h"
-
-#define AT91_RTC_IDR 0x24 /* Interrupt Disable Register */
-#define AT91_RTC_IMR 0x28 /* Interrupt Mask Register */
-#define AT91_RTC_IRQ_MASK 0x1f /* Available IRQs mask */
-
-void __init at91_sysirq_mask_rtc(u32 rtc_base)
-{
- void __iomem *base;
-
- base = ioremap(rtc_base, 64);
- if (!base)
- return;
-
- /*
- * sam9x5 SoCs have the following errata:
- * "RTC: Interrupt Mask Register cannot be used
- * Interrupt Mask Register read always returns 0."
- *
- * Hence we're not relying on IMR values to disable
- * interrupts.
- */
- writel_relaxed(AT91_RTC_IRQ_MASK, base + AT91_RTC_IDR);
- (void)readl_relaxed(base + AT91_RTC_IMR); /* flush */
-
- iounmap(base);
-}
-
-void __init at91_sysirq_mask_rtt(u32 rtt_base)
-{
- void __iomem *base;
- void __iomem *reg;
- u32 mode;
-
- base = ioremap(rtt_base, 16);
- if (!base)
- return;
-
- reg = base + AT91_RTT_MR;
-
- mode = readl_relaxed(reg);
- if (mode & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN)) {
- pr_info("AT91: Disabling rtt irq\n");
- mode &= ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
- writel_relaxed(mode, reg);
- (void)readl_relaxed(reg); /* flush */
- }
-
- iounmap(base);
-}