projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 6de714c2 JH |
1 | /* |
| 2 | * sysirq_mask.c - System-interrupt masking | |
| 3 | * | |
| 4 | * Copyright (C) 2013 Johan Hovold <jhovold@gmail.com> | |
| 5 | * | |
| 6 | * Functions to disable system interrupts from backup-powered peripherals. | |
| 7 | * | |
| 8 | * The RTC and RTT-peripherals are generally powered by backup power (VDDBU) | |
| 9 | * and are not reset on wake-up, user, watchdog or software reset. This means | |
| 10 | * that their interrupts may be enabled during early boot (e.g. after a user | |
| 11 | * reset). | |
| 12 | * | |
| 13 | * As the RTC and RTT share the system-interrupt line with the PIT, an | |
| 14 | * interrupt occurring before a handler has been installed would lead to the | |
| 15 | * system interrupt being disabled and prevent the system from booting. | |
| 16 | * | |
| 17 | * This program is free software; you can redistribute it and/or modify | |
| 18 | * it under the terms of the GNU General Public License as published by | |
| 19 | * the Free Software Foundation; either version 2 of the License, or | |
| 20 | * (at your option) any later version. | |
| 21 | */ | |
| 22 | ||
| 23 | #include <linux/io.h> | |
| 94c4c79f | 24 | #include <mach/at91_rtt.h> |
| 6de714c2 JH |
25 | |
| 26 | #include "generic.h" | |
| 27 | ||
| 28 | #define AT91_RTC_IDR 0x24 /* Interrupt Disable Register */ | |
| 29 | #define AT91_RTC_IMR 0x28 /* Interrupt Mask Register */ | |
| 30 | ||
| 31 | void __init at91_sysirq_mask_rtc(u32 rtc_base) | |
| 32 | { | |
| 33 | void __iomem *base; | |
| 34 | u32 mask; | |
| 35 | ||
| 36 | base = ioremap(rtc_base, 64); | |
| 37 | if (!base) | |
| 38 | return; | |
| 39 | ||
| 40 | mask = readl_relaxed(base + AT91_RTC_IMR); | |
| 41 | if (mask) { | |
| 42 | pr_info("AT91: Disabling rtc irq\n"); | |
| 43 | writel_relaxed(mask, base + AT91_RTC_IDR); | |
| 44 | (void)readl_relaxed(base + AT91_RTC_IMR); /* flush */ | |
| 45 | } | |
| 46 | ||
| 47 | iounmap(base); | |
| 48 | } | |
| 94c4c79f JH |
49 | |
| 50 | void __init at91_sysirq_mask_rtt(u32 rtt_base) | |
| 51 | { | |
| 52 | void __iomem *base; | |
| 53 | void __iomem *reg; | |
| 54 | u32 mode; | |
| 55 | ||
| 56 | base = ioremap(rtt_base, 16); | |
| 57 | if (!base) | |
| 58 | return; | |
| 59 | ||
| 60 | reg = base + AT91_RTT_MR; | |
| 61 | ||
| 62 | mode = readl_relaxed(reg); | |
| 63 | if (mode & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN)) { | |
| 64 | pr_info("AT91: Disabling rtt irq\n"); | |
| 65 | mode &= ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN); | |
| 66 | writel_relaxed(mode, reg); | |
| 67 | (void)readl_relaxed(reg); /* flush */ | |
| 68 | } | |
| 69 | ||
| 70 | iounmap(base); | |
| 71 | } |