ddb7d1e975
Clear the interrupt mask registers of ASB2364 peripherals before enabling interrupts so that any peripherals that weren't dealt with by the bootloader after a reboot (if there was one) won't cause an interrupt storm when interrupts are first enabled before the drivers are initialised. Also, attempt to reset the peripherals attached to the FPGA. Signed-off-by: David Howells <dhowells@redhat.com>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/* ASB2364 initialisation
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include <asm/setup.h>
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#include <asm/processor.h>
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#include <asm/irq.h>
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#include <asm/intctl-regs.h>
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#include <asm/serial-regs.h>
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#include <unit/fpga-regs.h>
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#include <unit/serial.h>
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#include <unit/smsc911x.h>
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#define TTYS0_SERIAL_IER __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IER * 2, u8)
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#define LAN_IRQ_CFG __SYSREG(SMSC911X_BASE + 0x54, u32)
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#define LAN_INT_EN __SYSREG(SMSC911X_BASE + 0x5c, u32)
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/*
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* initialise some of the unit hardware before gdbstub is set up
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*/
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asmlinkage void __init unit_init(void)
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{
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/* Make sure we aren't going to get unexpected interrupts */
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TTYS0_SERIAL_IER = 0;
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SC0RXICR = 0;
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SC0TXICR = 0;
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SC1RXICR = 0;
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SC1TXICR = 0;
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SC2RXICR = 0;
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SC2TXICR = 0;
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/* Attempt to reset the FPGA attached peripherals */
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ASB2364_FPGA_REG_RESET_LAN = 0x0000;
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SyncExBus();
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ASB2364_FPGA_REG_RESET_UART = 0x0000;
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SyncExBus();
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ASB2364_FPGA_REG_RESET_I2C = 0x0000;
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SyncExBus();
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ASB2364_FPGA_REG_RESET_USB = 0x0000;
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SyncExBus();
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ASB2364_FPGA_REG_RESET_AV = 0x0000;
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SyncExBus();
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/* set up the external interrupts */
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/* XIRQ[0]: NAND RXBY */
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/* SET_XIRQ_TRIGGER(0, XIRQ_TRIGGER_LOWLEVEL); */
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/* XIRQ[1]: LAN, UART, I2C, USB, PCI, FPGA */
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SET_XIRQ_TRIGGER(1, XIRQ_TRIGGER_LOWLEVEL);
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/* XIRQ[2]: Extend Slot 1-9 */
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/* SET_XIRQ_TRIGGER(2, XIRQ_TRIGGER_LOWLEVEL); */
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#if defined(CONFIG_EXT_SERIAL_IRQ_LEVEL) && \
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defined(CONFIG_ETHERNET_IRQ_LEVEL) && \
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(CONFIG_EXT_SERIAL_IRQ_LEVEL != CONFIG_ETHERNET_IRQ_LEVEL)
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# error CONFIG_EXT_SERIAL_IRQ_LEVEL != CONFIG_ETHERNET_IRQ_LEVEL
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#endif
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#if defined(CONFIG_EXT_SERIAL_IRQ_LEVEL)
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set_intr_level(XIRQ1, NUM2GxICR_LEVEL(CONFIG_EXT_SERIAL_IRQ_LEVEL));
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#elif defined(CONFIG_ETHERNET_IRQ_LEVEL)
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set_intr_level(XIRQ1, NUM2GxICR_LEVEL(CONFIG_ETHERNET_IRQ_LEVEL));
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#endif
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}
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/*
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* initialise the rest of the unit hardware after gdbstub is ready
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*/
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asmlinkage void __init unit_setup(void)
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{
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/* Release the reset on the SMSC911X so that it is ready by the time we
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* need it */
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ASB2364_FPGA_REG_RESET_LAN = 0x0001;
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SyncExBus();
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ASB2364_FPGA_REG_RESET_UART = 0x0001;
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SyncExBus();
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ASB2364_FPGA_REG_RESET_I2C = 0x0001;
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SyncExBus();
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ASB2364_FPGA_REG_RESET_USB = 0x0001;
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SyncExBus();
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ASB2364_FPGA_REG_RESET_AV = 0x0001;
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SyncExBus();
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/* Make sure the ethernet chipset isn't going to give us an interrupt
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* storm from stuff it was doing pre-reset */
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LAN_IRQ_CFG = 0;
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LAN_INT_EN = 0;
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}
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/*
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* initialise the external interrupts used by a unit of this type
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*/
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void __init unit_init_IRQ(void)
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{
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unsigned int extnum;
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for (extnum = 0 ; extnum < NR_XIRQS ; extnum++) {
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switch (GET_XIRQ_TRIGGER(extnum)) {
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/* LEVEL triggered interrupts should be made
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* post-ACK'able as they hold their lines until
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* serviced
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*/
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case XIRQ_TRIGGER_HILEVEL:
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case XIRQ_TRIGGER_LOWLEVEL:
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mn10300_set_lateack_irq_type(XIRQ2IRQ(extnum));
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break;
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default:
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break;
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}
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}
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#define IRQCTL __SYSREG(0xd5000090, u32)
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IRQCTL |= 0x02;
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irq_fpga_init();
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}
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