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  */
  35 asmlinkage 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  */
  85 asmlinkage 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  */
 109 void __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 }