LXR linux/arch/mn10300/unit-asb2364/unit-init.c

   1/* ASB2364 initialisation
   2 *
   3 * Copyright (C) 2002 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 License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/param.h>
  14#include <linux/init.h>
  15#include <linux/device.h>
  16#include <linux/delay.h>
  17
  18#include <asm/io.h>
  19#include <asm/setup.h>
  20#include <asm/processor.h>
  21#include <asm/irq.h>
  22#include <asm/intctl-regs.h>
  23#include <asm/serial-regs.h>
  24#include <unit/fpga-regs.h>
  25#include <unit/serial.h>
  26#include <unit/smsc911x.h>
  27
  28#define TTYS0_SERIAL_IER        __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IER * 2, u8)
  29#define LAN_IRQ_CFG             __SYSREG(SMSC911X_BASE + 0x54, u32)
  30#define LAN_INT_EN              __SYSREG(SMSC911X_BASE + 0x5c, u32)
  31
  32/*
  33 * initialise some of the unit hardware before gdbstub is set up
  34 */
  35asmlinkage void __init unit_init(void)
  36{
  37        /* Make sure we aren't going to get unexpected interrupts */
  38        TTYS0_SERIAL_IER = 0;
  39        SC0RXICR = 0;
  40        SC0TXICR = 0;
  41        SC1RXICR = 0;
  42        SC1TXICR = 0;
  43        SC2RXICR = 0;
  44        SC2TXICR = 0;
  45
  46        /* Attempt to reset the FPGA attached peripherals */
  47        ASB2364_FPGA_REG_RESET_LAN = 0x0000;
  48        SyncExBus();
  49        ASB2364_FPGA_REG_RESET_UART = 0x0000;
  50        SyncExBus();
  51        ASB2364_FPGA_REG_RESET_I2C = 0x0000;
  52        SyncExBus();
  53        ASB2364_FPGA_REG_RESET_USB = 0x0000;
  54        SyncExBus();
  55        ASB2364_FPGA_REG_RESET_AV = 0x0000;
  56        SyncExBus();
  57
  58        /* set up the external interrupts */
  59
  60        /* XIRQ[0]: NAND RXBY */
  61        /* SET_XIRQ_TRIGGER(0, XIRQ_TRIGGER_LOWLEVEL); */
  62
  63        /* XIRQ[1]: LAN, UART, I2C, USB, PCI, FPGA */
  64        SET_XIRQ_TRIGGER(1, XIRQ_TRIGGER_LOWLEVEL);
  65
  66        /* XIRQ[2]: Extend Slot 1-9 */
  67        /* SET_XIRQ_TRIGGER(2, XIRQ_TRIGGER_LOWLEVEL); */
  68
  69#if defined(CONFIG_EXT_SERIAL_IRQ_LEVEL) &&     \
  70    defined(CONFIG_ETHERNET_IRQ_LEVEL) &&       \
  71    (CONFIG_EXT_SERIAL_IRQ_LEVEL != CONFIG_ETHERNET_IRQ_LEVEL)
  72# error CONFIG_EXT_SERIAL_IRQ_LEVEL != CONFIG_ETHERNET_IRQ_LEVEL
  73#endif
  74
  75#if defined(CONFIG_EXT_SERIAL_IRQ_LEVEL)
  76        set_intr_level(XIRQ1, NUM2GxICR_LEVEL(CONFIG_EXT_SERIAL_IRQ_LEVEL));
  77#elif defined(CONFIG_ETHERNET_IRQ_LEVEL)
  78        set_intr_level(XIRQ1, NUM2GxICR_LEVEL(CONFIG_ETHERNET_IRQ_LEVEL));
  79#endif
  80}
  81
  82/*
  83 * initialise the rest of the unit hardware after gdbstub is ready
  84 */
  85asmlinkage void __init unit_setup(void)
  86{
  87        /* Release the reset on the SMSC911X so that it is ready by the time we
  88         * need it */
  89        ASB2364_FPGA_REG_RESET_LAN = 0x0001;
  90        SyncExBus();
  91        ASB2364_FPGA_REG_RESET_UART = 0x0001;
  92        SyncExBus();
  93        ASB2364_FPGA_REG_RESET_I2C = 0x0001;
  94        SyncExBus();
  95        ASB2364_FPGA_REG_RESET_USB = 0x0001;
  96        SyncExBus();
  97        ASB2364_FPGA_REG_RESET_AV = 0x0001;
  98        SyncExBus();
  99
 100        /* Make sure the ethernet chipset isn't going to give us an interrupt
 101         * storm from stuff it was doing pre-reset */
 102        LAN_IRQ_CFG = 0;
 103        LAN_INT_EN = 0;
 104}
 105
 106/*
 107 * initialise the external interrupts used by a unit of this type
 108 */
 109void __init unit_init_IRQ(void)
 110{
 111        unsigned int extnum;
 112
 113        for (extnum = 0 ; extnum < NR_XIRQS ; extnum++) {
 114                switch (GET_XIRQ_TRIGGER(extnum)) {
 115                        /* LEVEL triggered interrupts should be made
 116                         * post-ACK'able as they hold their lines until
 117                         * serviced
 118                         */
 119                case XIRQ_TRIGGER_HILEVEL:
 120                case XIRQ_TRIGGER_LOWLEVEL:
 121                        mn10300_set_lateack_irq_type(XIRQ2IRQ(extnum));
 122                        break;
 123                default:
 124                        break;
 125                }
 126        }
 127
 128#define IRQCTL  __SYSREG(0xd5000090, u32)
 129        IRQCTL |= 0x02;
 130
 131        irq_fpga_init();
 132}
 133