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94c4c79f2f
Make sure the RTT-interrupts are masked at boot by adding a new helper function to be used at SOC-init. This fixes hanged boot on all AT91 SOCs with an RTT, for example, if an RTT-alarm goes off after a non-clean shutdown (e.g. when using RTC wakeup). The RTC and RTT-peripherals are powered by backup power (VDDBU) (on all AT91 SOCs but RM9200) and are not reset on wake-up, user, watchdog or software reset. This means that their interrupts may be enabled during early boot if, for example, they where not disabled during a previous shutdown (e.g. due to a buggy driver or a non-clean shutdown such as a user reset). Furthermore, an RTC or RTT-alarm may also be active. The RTC and RTT-interrupts use the shared system-interrupt line, which is also used by the PIT, and if an interrupt occurs before a handler (e.g. RTC-driver) has been installed this leads to the system interrupt being disabled and prevents the system from booting. Note that when boot hangs due to an early RTC or RTT-interrupt, the only way to get the system to start again is to remove the backup power (e.g. battery) or to disable the interrupt manually from the bootloader. In particular, a user reset is not sufficient. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Cc: stable@vger.kernel.org # 3.11.x
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/*
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* linux/arch/arm/mach-at91/generic.h
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*
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* Copyright (C) 2005 David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clkdev.h>
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#include <linux/of.h>
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#include <linux/reboot.h>
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/* Map io */
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extern void __init at91_map_io(void);
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extern void __init at91_init_sram(int bank, unsigned long base,
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unsigned int length);
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/* Processors */
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extern void __init at91rm9200_set_type(int type);
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extern void __init at91_initialize(unsigned long main_clock);
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extern void __init at91x40_initialize(unsigned long main_clock);
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extern void __init at91rm9200_dt_initialize(void);
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extern void __init at91_dt_initialize(void);
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/* Interrupts */
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extern void __init at91_init_irq_default(void);
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extern void __init at91_init_interrupts(unsigned int priority[]);
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extern void __init at91x40_init_interrupts(unsigned int priority[]);
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extern void __init at91_aic_init(unsigned int priority[],
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unsigned int ext_irq_mask);
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extern int __init at91_aic_of_init(struct device_node *node,
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struct device_node *parent);
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extern int __init at91_aic5_of_init(struct device_node *node,
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struct device_node *parent);
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extern void __init at91_sysirq_mask_rtc(u32 rtc_base);
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extern void __init at91_sysirq_mask_rtt(u32 rtt_base);
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/* Timer */
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extern void at91rm9200_ioremap_st(u32 addr);
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extern void at91rm9200_timer_init(void);
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extern void at91sam926x_ioremap_pit(u32 addr);
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extern void at91sam926x_pit_init(void);
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extern void at91x40_timer_init(void);
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/* Clocks */
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#ifdef CONFIG_AT91_PMC_UNIT
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extern int __init at91_clock_init(unsigned long main_clock);
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extern int __init at91_dt_clock_init(void);
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#else
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static int inline at91_clock_init(unsigned long main_clock) { return 0; }
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#endif
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struct device;
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/* Power Management */
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extern void at91_irq_suspend(void);
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extern void at91_irq_resume(void);
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/* idle */
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extern void at91sam9_idle(void);
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/* reset */
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extern void at91_ioremap_rstc(u32 base_addr);
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extern void at91sam9_alt_restart(enum reboot_mode, const char *);
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extern void at91sam9g45_restart(enum reboot_mode, const char *);
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/* shutdown */
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extern void at91_ioremap_shdwc(u32 base_addr);
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/* Matrix */
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extern void at91_ioremap_matrix(u32 base_addr);
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/* Ram Controler */
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extern void at91_ioremap_ramc(int id, u32 addr, u32 size);
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/* GPIO */
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#define AT91RM9200_PQFP 3 /* AT91RM9200 PQFP package has 3 banks */
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#define AT91RM9200_BGA 4 /* AT91RM9200 BGA package has 4 banks */
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struct at91_gpio_bank {
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unsigned short id; /* peripheral ID */
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unsigned long regbase; /* offset from system peripheral base */
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};
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extern void __init at91_gpio_init(struct at91_gpio_bank *, int nr_banks);
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extern void __init at91_gpio_irq_setup(void);
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extern int __init at91_gpio_of_irq_setup(struct device_node *node,
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struct device_node *parent);
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extern u32 at91_get_extern_irq(void);
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