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- /* ASB2364 FPGA interrupt multiplexing
- *
- * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
- #include <linux/interrupt.h>
- #include <linux/init.h>
- #include <linux/irq.h>
- #include <unit/fpga-regs.h>
- /*
- * FPGA PIC operations
- */
- static void asb2364_fpga_mask(struct irq_data *d)
- {
- ASB2364_FPGA_REG_MASK(d->irq - NR_CPU_IRQS) = 0x0001;
- SyncExBus();
- }
- static void asb2364_fpga_ack(struct irq_data *d)
- {
- ASB2364_FPGA_REG_IRQ(d->irq - NR_CPU_IRQS) = 0x0001;
- SyncExBus();
- }
- static void asb2364_fpga_mask_ack(struct irq_data *d)
- {
- ASB2364_FPGA_REG_MASK(d->irq - NR_CPU_IRQS) = 0x0001;
- SyncExBus();
- ASB2364_FPGA_REG_IRQ(d->irq - NR_CPU_IRQS) = 0x0001;
- SyncExBus();
- }
- static void asb2364_fpga_unmask(struct irq_data *d)
- {
- ASB2364_FPGA_REG_MASK(d->irq - NR_CPU_IRQS) = 0x0000;
- SyncExBus();
- }
- static struct irq_chip asb2364_fpga_pic = {
- .name = "fpga",
- .irq_ack = asb2364_fpga_ack,
- .irq_mask = asb2364_fpga_mask,
- .irq_mask_ack = asb2364_fpga_mask_ack,
- .irq_unmask = asb2364_fpga_unmask,
- };
- /*
- * FPGA PIC interrupt handler
- */
- static irqreturn_t fpga_interrupt(int irq, void *_mask)
- {
- if ((ASB2364_FPGA_REG_IRQ_LAN & 0x0001) != 0x0001)
- generic_handle_irq(FPGA_LAN_IRQ);
- if ((ASB2364_FPGA_REG_IRQ_UART & 0x0001) != 0x0001)
- generic_handle_irq(FPGA_UART_IRQ);
- if ((ASB2364_FPGA_REG_IRQ_I2C & 0x0001) != 0x0001)
- generic_handle_irq(FPGA_I2C_IRQ);
- if ((ASB2364_FPGA_REG_IRQ_USB & 0x0001) != 0x0001)
- generic_handle_irq(FPGA_USB_IRQ);
- if ((ASB2364_FPGA_REG_IRQ_FPGA & 0x0001) != 0x0001)
- generic_handle_irq(FPGA_FPGA_IRQ);
- return IRQ_HANDLED;
- }
- /*
- * Define an interrupt action for each FPGA PIC output
- */
- static struct irqaction fpga_irq[] = {
- [0] = {
- .handler = fpga_interrupt,
- .flags = IRQF_SHARED,
- .name = "fpga",
- },
- };
- /*
- * Initialise the FPGA's PIC
- */
- void __init irq_fpga_init(void)
- {
- int irq;
- ASB2364_FPGA_REG_MASK_LAN = 0x0001;
- SyncExBus();
- ASB2364_FPGA_REG_MASK_UART = 0x0001;
- SyncExBus();
- ASB2364_FPGA_REG_MASK_I2C = 0x0001;
- SyncExBus();
- ASB2364_FPGA_REG_MASK_USB = 0x0001;
- SyncExBus();
- ASB2364_FPGA_REG_MASK_FPGA = 0x0001;
- SyncExBus();
- for (irq = NR_CPU_IRQS; irq < NR_IRQS; irq++)
- irq_set_chip_and_handler(irq, &asb2364_fpga_pic,
- handle_level_irq);
- /* the FPGA drives the XIRQ1 input on the CPU PIC */
- setup_irq(XIRQ1, &fpga_irq[0]);
- }
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