diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/mips/pmcs-msp71xx/msp_irq_slp.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/mips/pmcs-msp71xx/msp_irq_slp.c')
-rw-r--r-- | kernel/arch/mips/pmcs-msp71xx/msp_irq_slp.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/kernel/arch/mips/pmcs-msp71xx/msp_irq_slp.c b/kernel/arch/mips/pmcs-msp71xx/msp_irq_slp.c new file mode 100644 index 000000000..5f66a7631 --- /dev/null +++ b/kernel/arch/mips/pmcs-msp71xx/msp_irq_slp.c @@ -0,0 +1,106 @@ +/* + * This file define the irq handler for MSP SLM subsystem interrupts. + * + * Copyright 2005-2006 PMC-Sierra, Inc, derived from irq_cpu.c + * Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com + * + * 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/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/bitops.h> + +#include <asm/mipsregs.h> + +#include <msp_slp_int.h> +#include <msp_regs.h> + +static inline void unmask_msp_slp_irq(struct irq_data *d) +{ + unsigned int irq = d->irq; + + /* check for PER interrupt range */ + if (irq < MSP_PER_INTBASE) + *SLP_INT_MSK_REG |= (1 << (irq - MSP_SLP_INTBASE)); + else + *PER_INT_MSK_REG |= (1 << (irq - MSP_PER_INTBASE)); +} + +static inline void mask_msp_slp_irq(struct irq_data *d) +{ + unsigned int irq = d->irq; + + /* check for PER interrupt range */ + if (irq < MSP_PER_INTBASE) + *SLP_INT_MSK_REG &= ~(1 << (irq - MSP_SLP_INTBASE)); + else + *PER_INT_MSK_REG &= ~(1 << (irq - MSP_PER_INTBASE)); +} + +/* + * While we ack the interrupt interrupts are disabled and thus we don't need + * to deal with concurrency issues. Same for msp_slp_irq_end. + */ +static inline void ack_msp_slp_irq(struct irq_data *d) +{ + unsigned int irq = d->irq; + + /* check for PER interrupt range */ + if (irq < MSP_PER_INTBASE) + *SLP_INT_STS_REG = (1 << (irq - MSP_SLP_INTBASE)); + else + *PER_INT_STS_REG = (1 << (irq - MSP_PER_INTBASE)); +} + +static struct irq_chip msp_slp_irq_controller = { + .name = "MSP_SLP", + .irq_ack = ack_msp_slp_irq, + .irq_mask = mask_msp_slp_irq, + .irq_unmask = unmask_msp_slp_irq, +}; + +void __init msp_slp_irq_init(void) +{ + int i; + + /* Mask/clear interrupts. */ + *SLP_INT_MSK_REG = 0x00000000; + *PER_INT_MSK_REG = 0x00000000; + *SLP_INT_STS_REG = 0xFFFFFFFF; + *PER_INT_STS_REG = 0xFFFFFFFF; + + /* initialize all the IRQ descriptors */ + for (i = MSP_SLP_INTBASE; i < MSP_PER_INTBASE + 32; i++) + irq_set_chip_and_handler(i, &msp_slp_irq_controller, + handle_level_irq); +} + +void msp_slp_irq_dispatch(void) +{ + u32 pending; + int intbase; + + intbase = MSP_SLP_INTBASE; + pending = *SLP_INT_STS_REG & *SLP_INT_MSK_REG; + + /* check for PER interrupt */ + if (pending == (1 << (MSP_INT_PER - MSP_SLP_INTBASE))) { + intbase = MSP_PER_INTBASE; + pending = *PER_INT_STS_REG & *PER_INT_MSK_REG; + } + + /* check for spurious interrupt */ + if (pending == 0x00000000) { + printk(KERN_ERR "Spurious %s interrupt?\n", + (intbase == MSP_SLP_INTBASE) ? "SLP" : "PER"); + return; + } + + /* dispatch the irq */ + do_IRQ(ffs(pending) + intbase - 1); +} |