projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 6044cf1d DH |
1 | /* ASB2364 FPGA interrupt multiplexing |
| 2 | * | |
| 3 | * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. | |
| 4 | * Written by David Howells (dhowells@redhat.com) | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU General Public Licence | |
| 8 | * as published by the Free Software Foundation; either version | |
| 9 | * 2 of the Licence, or (at your option) any later version. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/interrupt.h> | |
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/irq.h> | |
| 15 | #include <unit/fpga-regs.h> | |
| 16 | ||
| 17 | /* | |
| 18 | * FPGA PIC operations | |
| 19 | */ | |
| 20 | static void asb2364_fpga_mask(unsigned int irq) | |
| 21 | { | |
| 22 | ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0001; | |
| 23 | SyncExBus(); | |
| 24 | } | |
| 25 | ||
| 26 | static void asb2364_fpga_ack(unsigned int irq) | |
| 27 | { | |
| 28 | ASB2364_FPGA_REG_IRQ(irq - NR_CPU_IRQS) = 0x0001; | |
| 29 | SyncExBus(); | |
| 30 | } | |
| 31 | ||
| 32 | static void asb2364_fpga_mask_ack(unsigned int irq) | |
| 33 | { | |
| 34 | ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0001; | |
| 35 | SyncExBus(); | |
| 36 | ASB2364_FPGA_REG_IRQ(irq - NR_CPU_IRQS) = 0x0001; | |
| 37 | SyncExBus(); | |
| 38 | } | |
| 39 | ||
| 40 | static void asb2364_fpga_unmask(unsigned int irq) | |
| 41 | { | |
| 42 | ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0000; | |
| 43 | SyncExBus(); | |
| 44 | } | |
| 45 | ||
| 46 | static struct irq_chip asb2364_fpga_pic = { | |
| 47 | .name = "fpga", | |
| 48 | .ack = asb2364_fpga_ack, | |
| 49 | .mask = asb2364_fpga_mask, | |
| 50 | .mask_ack = asb2364_fpga_mask_ack, | |
| 51 | .unmask = asb2364_fpga_unmask, | |
| 52 | }; | |
| 53 | ||
| 54 | /* | |
| 55 | * FPGA PIC interrupt handler | |
| 56 | */ | |
| 57 | static irqreturn_t fpga_interrupt(int irq, void *_mask) | |
| 58 | { | |
| 59 | if ((ASB2364_FPGA_REG_IRQ_LAN & 0x0001) != 0x0001) | |
| 60 | generic_handle_irq(FPGA_LAN_IRQ); | |
| 61 | if ((ASB2364_FPGA_REG_IRQ_UART & 0x0001) != 0x0001) | |
| 62 | generic_handle_irq(FPGA_UART_IRQ); | |
| 63 | if ((ASB2364_FPGA_REG_IRQ_I2C & 0x0001) != 0x0001) | |
| 64 | generic_handle_irq(FPGA_I2C_IRQ); | |
| 65 | if ((ASB2364_FPGA_REG_IRQ_USB & 0x0001) != 0x0001) | |
| 66 | generic_handle_irq(FPGA_USB_IRQ); | |
| 67 | if ((ASB2364_FPGA_REG_IRQ_FPGA & 0x0001) != 0x0001) | |
| 68 | generic_handle_irq(FPGA_FPGA_IRQ); | |
| 69 | ||
| 70 | return IRQ_HANDLED; | |
| 71 | } | |
| 72 | ||
| 73 | /* | |
| 74 | * Define an interrupt action for each FPGA PIC output | |
| 75 | */ | |
| 76 | static struct irqaction fpga_irq[] = { | |
| 77 | [0] = { | |
| 78 | .handler = fpga_interrupt, | |
| 79 | .flags = IRQF_DISABLED | IRQF_SHARED, | |
| 80 | .name = "fpga", | |
| 81 | }, | |
| 82 | }; | |
| 83 | ||
| 84 | /* | |
| 85 | * Initialise the FPGA's PIC | |
| 86 | */ | |
| 87 | void __init irq_fpga_init(void) | |
| 88 | { | |
| 89 | int irq; | |
| 90 | ||
| 91 | for (irq = NR_CPU_IRQS; irq < NR_IRQS; irq++) | |
| 92 | set_irq_chip_and_handler(irq, &asb2364_fpga_pic, handle_level_irq); | |
| 93 | ||
| 94 | /* the FPGA drives the XIRQ1 input on the CPU PIC */ | |
| 95 | setup_irq(XIRQ1, &fpga_irq[0]); | |
| 96 | } |