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b6e23bb63f
There is ~10% possibility that the following emergency restart command
fails to reboot imx6q.
$ echo b > /proc/sysrq-trigger
The IMX restart routine mxc_restart() assumes that it will always run on
primary core, and will call imx_src_prepare_restart() to disable
secondary cores in order to get them come to online in the following
boot. However, the assumption is only true for normal kernel_restart()
case where migrate_to_reboot_cpu() will be called to migrate to primary
core, but not necessarily true for emergency_restart() case. So when
emergency_restart() calls into mxc_restart() on any secondary core,
system will hang immediately once imx_src_prepare_restart() is called
to disabled secondary cores. Since emergency_restart() is defined as a
function that is safe to call in interrupt context, we cannot just call
migrate_to_reboot_cpu() to fix the issue.
Fortunately, we just found that the issue can be fixed at imx6q platform
level. We used to call imx_src_prepare_restart() to disable all
secondary cores before resetting hardware. Otherwise, the secondary
will fail come to online in the reboot. However, we recently found that
after commit 6050d18 (ARM: imx: reset core along with enable/disable
operation) comes to play, we do not need to reset the secondary cores
any more. That said, mxc_restart() now can run on any core to reboot
the system, as long as we remove the imx_src_prepare_restart() call from
mxc_restart().
So let's simply remove imx_src_prepare_restart() call to fix the above
emergency restart failure.
Reported-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
171 lines
4.7 KiB
C
171 lines
4.7 KiB
C
/*
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* Copyright 2004-2013 Freescale Semiconductor, Inc. All Rights Reserved.
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*/
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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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#ifndef __ASM_ARCH_MXC_COMMON_H__
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#define __ASM_ARCH_MXC_COMMON_H__
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#include <linux/reboot.h>
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struct irq_data;
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struct platform_device;
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struct pt_regs;
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struct clk;
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enum mxc_cpu_pwr_mode;
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void mx1_map_io(void);
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void mx21_map_io(void);
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void mx25_map_io(void);
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void mx27_map_io(void);
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void mx31_map_io(void);
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void mx35_map_io(void);
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void mx51_map_io(void);
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void mx53_map_io(void);
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void imx1_init_early(void);
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void imx21_init_early(void);
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void imx25_init_early(void);
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void imx27_init_early(void);
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void imx31_init_early(void);
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void imx35_init_early(void);
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void imx51_init_early(void);
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void imx53_init_early(void);
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void mxc_init_irq(void __iomem *);
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void tzic_init_irq(void __iomem *);
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void mx1_init_irq(void);
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void mx21_init_irq(void);
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void mx25_init_irq(void);
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void mx27_init_irq(void);
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void mx31_init_irq(void);
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void mx35_init_irq(void);
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void mx51_init_irq(void);
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void mx53_init_irq(void);
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void imx1_soc_init(void);
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void imx21_soc_init(void);
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void imx25_soc_init(void);
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void imx27_soc_init(void);
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void imx31_soc_init(void);
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void imx35_soc_init(void);
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void imx51_soc_init(void);
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void imx51_init_late(void);
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void imx53_init_late(void);
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void epit_timer_init(void __iomem *base, int irq);
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void mxc_timer_init(void __iomem *, int);
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int mx1_clocks_init(unsigned long fref);
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int mx21_clocks_init(unsigned long lref, unsigned long fref);
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int mx25_clocks_init(void);
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int mx27_clocks_init(unsigned long fref);
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int mx31_clocks_init(unsigned long fref);
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int mx35_clocks_init(void);
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int mx51_clocks_init(unsigned long ckil, unsigned long osc,
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unsigned long ckih1, unsigned long ckih2);
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int mx25_clocks_init_dt(void);
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int mx27_clocks_init_dt(void);
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int mx31_clocks_init_dt(void);
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struct platform_device *mxc_register_gpio(char *name, int id,
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resource_size_t iobase, resource_size_t iosize, int irq, int irq_high);
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void mxc_set_cpu_type(unsigned int type);
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void mxc_restart(enum reboot_mode, const char *);
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void mxc_arch_reset_init(void __iomem *);
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void mxc_arch_reset_init_dt(void);
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int mx53_revision(void);
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void imx_set_aips(void __iomem *);
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int mxc_device_init(void);
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void imx_set_soc_revision(unsigned int rev);
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unsigned int imx_get_soc_revision(void);
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void imx_init_revision_from_anatop(void);
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struct device *imx_soc_device_init(void);
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enum mxc_cpu_pwr_mode {
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WAIT_CLOCKED, /* wfi only */
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WAIT_UNCLOCKED, /* WAIT */
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WAIT_UNCLOCKED_POWER_OFF, /* WAIT + SRPG */
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STOP_POWER_ON, /* just STOP */
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STOP_POWER_OFF, /* STOP + SRPG */
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};
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enum mx3_cpu_pwr_mode {
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MX3_RUN,
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MX3_WAIT,
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MX3_DOZE,
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MX3_SLEEP,
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};
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void mx3_cpu_lp_set(enum mx3_cpu_pwr_mode mode);
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void imx_print_silicon_rev(const char *cpu, int srev);
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void avic_handle_irq(struct pt_regs *);
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void tzic_handle_irq(struct pt_regs *);
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#define imx1_handle_irq avic_handle_irq
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#define imx21_handle_irq avic_handle_irq
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#define imx25_handle_irq avic_handle_irq
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#define imx27_handle_irq avic_handle_irq
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#define imx31_handle_irq avic_handle_irq
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#define imx35_handle_irq avic_handle_irq
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#define imx51_handle_irq tzic_handle_irq
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#define imx53_handle_irq tzic_handle_irq
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void imx_enable_cpu(int cpu, bool enable);
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void imx_set_cpu_jump(int cpu, void *jump_addr);
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u32 imx_get_cpu_arg(int cpu);
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void imx_set_cpu_arg(int cpu, u32 arg);
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void v7_cpu_resume(void);
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#ifdef CONFIG_SMP
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void v7_secondary_startup(void);
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void imx_scu_map_io(void);
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void imx_smp_prepare(void);
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void imx_scu_standby_enable(void);
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#else
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static inline void imx_scu_map_io(void) {}
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static inline void imx_smp_prepare(void) {}
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static inline void imx_scu_standby_enable(void) {}
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#endif
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void imx_src_init(void);
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void imx_gpc_init(void);
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void imx_gpc_pre_suspend(void);
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void imx_gpc_post_resume(void);
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void imx_gpc_mask_all(void);
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void imx_gpc_restore_all(void);
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void imx_gpc_irq_mask(struct irq_data *d);
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void imx_gpc_irq_unmask(struct irq_data *d);
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void imx_anatop_init(void);
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void imx_anatop_pre_suspend(void);
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void imx_anatop_post_resume(void);
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int imx6q_set_lpm(enum mxc_cpu_pwr_mode mode);
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void imx6q_set_chicken_bit(void);
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void imx_cpu_die(unsigned int cpu);
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int imx_cpu_kill(unsigned int cpu);
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#ifdef CONFIG_PM
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void imx6q_pm_init(void);
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void imx6q_pm_set_ccm_base(void __iomem *base);
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void imx5_pm_init(void);
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#else
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static inline void imx6q_pm_init(void) {}
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static inline void imx6q_pm_set_ccm_base(void __iomem *base) {}
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static inline void imx5_pm_init(void) {}
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#endif
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#ifdef CONFIG_NEON
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int mx51_neon_fixup(void);
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#else
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static inline int mx51_neon_fixup(void) { return 0; }
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#endif
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#ifdef CONFIG_CACHE_L2X0
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void imx_init_l2cache(void);
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#else
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static inline void imx_init_l2cache(void) {}
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#endif
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extern struct smp_operations imx_smp_ops;
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#endif
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