unit-init.c

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/* ASB2364 initialisation
 *
 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * 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/kernel.h>
#include <linux/param.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/delay.h>

#include <asm/io.h>
#include <asm/setup.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/intctl-regs.h>
#include <asm/serial-regs.h>
#include <unit/fpga-regs.h>
#include <unit/serial.h>
#include <unit/smsc911x.h>

#define TTYS0_SERIAL_IER    __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IER * 2, u8)
#define LAN_IRQ_CFG     __SYSREG(SMSC911X_BASE + 0x54, u32)
#define LAN_INT_EN      __SYSREG(SMSC911X_BASE + 0x5c, u32)

/*
 * initialise some of the unit hardware before gdbstub is set up
 */
asmlinkage void __init unit_init(void)
{
    /* Make sure we aren't going to get unexpected interrupts */
    TTYS0_SERIAL_IER = 0;
    SC0RXICR = 0;
    SC0TXICR = 0;
    SC1RXICR = 0;
    SC1TXICR = 0;
    SC2RXICR = 0;
    SC2TXICR = 0;

    /* Attempt to reset the FPGA attached peripherals */
    ASB2364_FPGA_REG_RESET_LAN = 0x0000;
    SyncExBus();
    ASB2364_FPGA_REG_RESET_UART = 0x0000;
    SyncExBus();
    ASB2364_FPGA_REG_RESET_I2C = 0x0000;
    SyncExBus();
    ASB2364_FPGA_REG_RESET_USB = 0x0000;
    SyncExBus();
    ASB2364_FPGA_REG_RESET_AV = 0x0000;
    SyncExBus();

    /* set up the external interrupts */

    /* XIRQ[0]: NAND RXBY */
    /* SET_XIRQ_TRIGGER(0, XIRQ_TRIGGER_LOWLEVEL); */

    /* XIRQ[1]: LAN, UART, I2C, USB, PCI, FPGA */
    SET_XIRQ_TRIGGER(1, XIRQ_TRIGGER_LOWLEVEL);

    /* XIRQ[2]: Extend Slot 1-9 */
    /* SET_XIRQ_TRIGGER(2, XIRQ_TRIGGER_LOWLEVEL); */

#if defined(CONFIG_EXT_SERIAL_IRQ_LEVEL) && \
    defined(CONFIG_ETHERNET_IRQ_LEVEL) &&   \
    (CONFIG_EXT_SERIAL_IRQ_LEVEL != CONFIG_ETHERNET_IRQ_LEVEL)
# error CONFIG_EXT_SERIAL_IRQ_LEVEL != CONFIG_ETHERNET_IRQ_LEVEL
#endif

#if defined(CONFIG_EXT_SERIAL_IRQ_LEVEL)
    set_intr_level(XIRQ1, NUM2GxICR_LEVEL(CONFIG_EXT_SERIAL_IRQ_LEVEL));
#elif defined(CONFIG_ETHERNET_IRQ_LEVEL)
    set_intr_level(XIRQ1, NUM2GxICR_LEVEL(CONFIG_ETHERNET_IRQ_LEVEL));
#endif
}

/*
 * initialise the rest of the unit hardware after gdbstub is ready
 */
asmlinkage void __init unit_setup(void)
{
    /* Release the reset on the SMSC911X so that it is ready by the time we
     * need it */
    ASB2364_FPGA_REG_RESET_LAN = 0x0001;
    SyncExBus();
    ASB2364_FPGA_REG_RESET_UART = 0x0001;
    SyncExBus();
    ASB2364_FPGA_REG_RESET_I2C = 0x0001;
    SyncExBus();
    ASB2364_FPGA_REG_RESET_USB = 0x0001;
    SyncExBus();
    ASB2364_FPGA_REG_RESET_AV = 0x0001;
    SyncExBus();

    /* Make sure the ethernet chipset isn't going to give us an interrupt
     * storm from stuff it was doing pre-reset */
    LAN_IRQ_CFG = 0;
    LAN_INT_EN = 0;
}

/*
 * initialise the external interrupts used by a unit of this type
 */
void __init unit_init_IRQ(void)
{
    unsigned int extnum;

    for (extnum = 0 ; extnum < NR_XIRQS ; extnum++) {
        switch (GET_XIRQ_TRIGGER(extnum)) {
            /* LEVEL triggered interrupts should be made
             * post-ACK'able as they hold their lines until
             * serviced
             */
        case XIRQ_TRIGGER_HILEVEL:
        case XIRQ_TRIGGER_LOWLEVEL:
            mn10300_set_lateack_irq_type(XIRQ2IRQ(extnum));
            break;
        default:
            break;
        }
    }

#define IRQCTL  __SYSREG(0xd5000090, u32)
    IRQCTL |= 0x02;

    irq_fpga_init();
}