projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 35832e26 MSJ |
1 | /* |
| 2 | * This file define the irq handler for MSP SLM subsystem interrupts. | |
| 3 | * | |
| 4 | * Copyright 2005-2006 PMC-Sierra, Inc, derived from irq_cpu.c | |
| 5 | * Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com | |
| 6 | * | |
| 70342287 RB |
7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the | |
| 35832e26 MSJ |
9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/interrupt.h> | |
| 15 | #include <linux/kernel.h> | |
| 16 | #include <linux/bitops.h> | |
| 17 | ||
| 18 | #include <asm/mipsregs.h> | |
| 35832e26 MSJ |
19 | |
| 20 | #include <msp_slp_int.h> | |
| 21 | #include <msp_regs.h> | |
| 22 | ||
| d7881fbd | 23 | static inline void unmask_msp_slp_irq(struct irq_data *d) |
| 35832e26 | 24 | { |
| d7881fbd TG |
25 | unsigned int irq = d->irq; |
| 26 | ||
| 35832e26 MSJ |
27 | /* check for PER interrupt range */ |
| 28 | if (irq < MSP_PER_INTBASE) | |
| 29 | *SLP_INT_MSK_REG |= (1 << (irq - MSP_SLP_INTBASE)); | |
| 30 | else | |
| 31 | *PER_INT_MSK_REG |= (1 << (irq - MSP_PER_INTBASE)); | |
| 32 | } | |
| 33 | ||
| d7881fbd | 34 | static inline void mask_msp_slp_irq(struct irq_data *d) |
| 35832e26 | 35 | { |
| d7881fbd TG |
36 | unsigned int irq = d->irq; |
| 37 | ||
| 35832e26 MSJ |
38 | /* check for PER interrupt range */ |
| 39 | if (irq < MSP_PER_INTBASE) | |
| 40 | *SLP_INT_MSK_REG &= ~(1 << (irq - MSP_SLP_INTBASE)); | |
| 41 | else | |
| 42 | *PER_INT_MSK_REG &= ~(1 << (irq - MSP_PER_INTBASE)); | |
| 43 | } | |
| 44 | ||
| 45 | /* | |
| 46 | * While we ack the interrupt interrupts are disabled and thus we don't need | |
| 47 | * to deal with concurrency issues. Same for msp_slp_irq_end. | |
| 48 | */ | |
| d7881fbd | 49 | static inline void ack_msp_slp_irq(struct irq_data *d) |
| 35832e26 | 50 | { |
| d7881fbd TG |
51 | unsigned int irq = d->irq; |
| 52 | ||
| 35832e26 MSJ |
53 | /* check for PER interrupt range */ |
| 54 | if (irq < MSP_PER_INTBASE) | |
| 55 | *SLP_INT_STS_REG = (1 << (irq - MSP_SLP_INTBASE)); | |
| 56 | else | |
| 57 | *PER_INT_STS_REG = (1 << (irq - MSP_PER_INTBASE)); | |
| 58 | } | |
| 59 | ||
| 60 | static struct irq_chip msp_slp_irq_controller = { | |
| 61 | .name = "MSP_SLP", | |
| d7881fbd TG |
62 | .irq_ack = ack_msp_slp_irq, |
| 63 | .irq_mask = mask_msp_slp_irq, | |
| 64 | .irq_unmask = unmask_msp_slp_irq, | |
| 35832e26 MSJ |
65 | }; |
| 66 | ||
| 67 | void __init msp_slp_irq_init(void) | |
| 68 | { | |
| 69 | int i; | |
| 70 | ||
| 71 | /* Mask/clear interrupts. */ | |
| 72 | *SLP_INT_MSK_REG = 0x00000000; | |
| 73 | *PER_INT_MSK_REG = 0x00000000; | |
| 74 | *SLP_INT_STS_REG = 0xFFFFFFFF; | |
| 75 | *PER_INT_STS_REG = 0xFFFFFFFF; | |
| 76 | ||
| 77 | /* initialize all the IRQ descriptors */ | |
| 78 | for (i = MSP_SLP_INTBASE; i < MSP_PER_INTBASE + 32; i++) | |
| e4ec7989 | 79 | irq_set_chip_and_handler(i, &msp_slp_irq_controller, |
| 35832e26 MSJ |
80 | handle_level_irq); |
| 81 | } | |
| 82 | ||
| 83 | void msp_slp_irq_dispatch(void) | |
| 84 | { | |
| 85 | u32 pending; | |
| 86 | int intbase; | |
| 87 | ||
| 88 | intbase = MSP_SLP_INTBASE; | |
| 89 | pending = *SLP_INT_STS_REG & *SLP_INT_MSK_REG; | |
| 90 | ||
| 91 | /* check for PER interrupt */ | |
| 92 | if (pending == (1 << (MSP_INT_PER - MSP_SLP_INTBASE))) { | |
| 93 | intbase = MSP_PER_INTBASE; | |
| 94 | pending = *PER_INT_STS_REG & *PER_INT_MSK_REG; | |
| 95 | } | |
| 96 | ||
| 97 | /* check for spurious interrupt */ | |
| 98 | if (pending == 0x00000000) { | |
| 99 | printk(KERN_ERR "Spurious %s interrupt?\n", | |
| 100 | (intbase == MSP_SLP_INTBASE) ? "SLP" : "PER"); | |
| 101 | return; | |
| 102 | } | |
| 103 | ||
| 104 | /* dispatch the irq */ | |
| 105 | do_IRQ(ffs(pending) + intbase - 1); | |
| 106 | } |