| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * This file define the irq handler for MSP SLM subsystem interrupts. |
| 4 | * |
| 5 | * Copyright 2005-2006 PMC-Sierra, Inc, derived from irq_cpu.c |
| 6 | * Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com |
| 7 | */ |
| 8 | |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/bitops.h> |
| 13 | |
| 14 | #include <asm/mipsregs.h> |
| 15 | |
| 16 | #include <msp_slp_int.h> |
| 17 | #include <msp_regs.h> |
| 18 | |
| 19 | static inline void unmask_msp_slp_irq(struct irq_data *d) |
| 20 | { |
| 21 | unsigned int irq = d->irq; |
| 22 | |
| 23 | /* check for PER interrupt range */ |
| 24 | if (irq < MSP_PER_INTBASE) |
| 25 | *SLP_INT_MSK_REG |= (1 << (irq - MSP_SLP_INTBASE)); |
| 26 | else |
| 27 | *PER_INT_MSK_REG |= (1 << (irq - MSP_PER_INTBASE)); |
| 28 | } |
| 29 | |
| 30 | static inline void mask_msp_slp_irq(struct irq_data *d) |
| 31 | { |
| 32 | unsigned int irq = d->irq; |
| 33 | |
| 34 | /* check for PER interrupt range */ |
| 35 | if (irq < MSP_PER_INTBASE) |
| 36 | *SLP_INT_MSK_REG &= ~(1 << (irq - MSP_SLP_INTBASE)); |
| 37 | else |
| 38 | *PER_INT_MSK_REG &= ~(1 << (irq - MSP_PER_INTBASE)); |
| 39 | } |
| 40 | |
| 41 | /* |
| 42 | * While we ack the interrupt interrupts are disabled and thus we don't need |
| 43 | * to deal with concurrency issues. Same for msp_slp_irq_end. |
| 44 | */ |
| 45 | static inline void ack_msp_slp_irq(struct irq_data *d) |
| 46 | { |
| 47 | unsigned int irq = d->irq; |
| 48 | |
| 49 | /* check for PER interrupt range */ |
| 50 | if (irq < MSP_PER_INTBASE) |
| 51 | *SLP_INT_STS_REG = (1 << (irq - MSP_SLP_INTBASE)); |
| 52 | else |
| 53 | *PER_INT_STS_REG = (1 << (irq - MSP_PER_INTBASE)); |
| 54 | } |
| 55 | |
| 56 | static struct irq_chip msp_slp_irq_controller = { |
| 57 | .name = "MSP_SLP", |
| 58 | .irq_ack = ack_msp_slp_irq, |
| 59 | .irq_mask = mask_msp_slp_irq, |
| 60 | .irq_unmask = unmask_msp_slp_irq, |
| 61 | }; |
| 62 | |
| 63 | void __init msp_slp_irq_init(void) |
| 64 | { |
| 65 | int i; |
| 66 | |
| 67 | /* Mask/clear interrupts. */ |
| 68 | *SLP_INT_MSK_REG = 0x00000000; |
| 69 | *PER_INT_MSK_REG = 0x00000000; |
| 70 | *SLP_INT_STS_REG = 0xFFFFFFFF; |
| 71 | *PER_INT_STS_REG = 0xFFFFFFFF; |
| 72 | |
| 73 | /* initialize all the IRQ descriptors */ |
| 74 | for (i = MSP_SLP_INTBASE; i < MSP_PER_INTBASE + 32; i++) |
| 75 | irq_set_chip_and_handler(i, &msp_slp_irq_controller, |
| 76 | handle_level_irq); |
| 77 | } |
| 78 | |
| 79 | void msp_slp_irq_dispatch(void) |
| 80 | { |
| 81 | u32 pending; |
| 82 | int intbase; |
| 83 | |
| 84 | intbase = MSP_SLP_INTBASE; |
| 85 | pending = *SLP_INT_STS_REG & *SLP_INT_MSK_REG; |
| 86 | |
| 87 | /* check for PER interrupt */ |
| 88 | if (pending == (1 << (MSP_INT_PER - MSP_SLP_INTBASE))) { |
| 89 | intbase = MSP_PER_INTBASE; |
| 90 | pending = *PER_INT_STS_REG & *PER_INT_MSK_REG; |
| 91 | } |
| 92 | |
| 93 | /* check for spurious interrupt */ |
| 94 | if (pending == 0x00000000) { |
| 95 | printk(KERN_ERR "Spurious %s interrupt?\n", |
| 96 | (intbase == MSP_SLP_INTBASE) ? "SLP" : "PER"); |
| 97 | return; |
| 98 | } |
| 99 | |
| 100 | /* dispatch the irq */ |
| 101 | do_IRQ(ffs(pending) + intbase - 1); |
| 102 | } |