release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/txx9/rbtx4927/irq.c

   1 /*
   2  * Toshiba RBTX4927 specific interrupt handlers
   3  *
   4  * Author: MontaVista Software, Inc.
   5  *         source@mvista.com
   6  *
   7  * Copyright 2001-2002 MontaVista Software Inc.
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License as published by the
  11  *  Free Software Foundation; either version 2 of the License, or (at your
  12  *  option) any later version.
  13  *
  14  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  15  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  16  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  19  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  20  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  21  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  22  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  23  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  *  You should have received a copy of the GNU General Public License along
  26  *  with this program; if not, write to the Free Software Foundation, Inc.,
  27  *  675 Mass Ave, Cambridge, MA 02139, USA.
  28  */
  29 /*
  30  * I8259A_IRQ_BASE+00
  31  * I8259A_IRQ_BASE+01 PS2/Keyboard
  32  * I8259A_IRQ_BASE+02 Cascade RBTX4927-ISA (irqs 8-15)
  33  * I8259A_IRQ_BASE+03
  34  * I8259A_IRQ_BASE+04
  35  * I8259A_IRQ_BASE+05
  36  * I8259A_IRQ_BASE+06
  37  * I8259A_IRQ_BASE+07
  38  * I8259A_IRQ_BASE+08
  39  * I8259A_IRQ_BASE+09
  40  * I8259A_IRQ_BASE+10
  41  * I8259A_IRQ_BASE+11
  42  * I8259A_IRQ_BASE+12 PS2/Mouse (not supported at this time)
  43  * I8259A_IRQ_BASE+13
  44  * I8259A_IRQ_BASE+14 IDE
  45  * I8259A_IRQ_BASE+15
  46  *
  47  * MIPS_CPU_IRQ_BASE+00 Software 0
  48  * MIPS_CPU_IRQ_BASE+01 Software 1
  49  * MIPS_CPU_IRQ_BASE+02 Cascade TX4927-CP0
  50  * MIPS_CPU_IRQ_BASE+03 Multiplexed -- do not use
  51  * MIPS_CPU_IRQ_BASE+04 Multiplexed -- do not use
  52  * MIPS_CPU_IRQ_BASE+05 Multiplexed -- do not use
  53  * MIPS_CPU_IRQ_BASE+06 Multiplexed -- do not use
  54  * MIPS_CPU_IRQ_BASE+07 CPU TIMER
  55  *
  56  * TXX9_IRQ_BASE+00
  57  * TXX9_IRQ_BASE+01
  58  * TXX9_IRQ_BASE+02
  59  * TXX9_IRQ_BASE+03 Cascade RBTX4927-IOC
  60  * TXX9_IRQ_BASE+04
  61  * TXX9_IRQ_BASE+05 RBTX4927 RTL-8019AS ethernet
  62  * TXX9_IRQ_BASE+06
  63  * TXX9_IRQ_BASE+07
  64  * TXX9_IRQ_BASE+08 TX4927 SerialIO Channel 0
  65  * TXX9_IRQ_BASE+09 TX4927 SerialIO Channel 1
  66  * TXX9_IRQ_BASE+10
  67  * TXX9_IRQ_BASE+11
  68  * TXX9_IRQ_BASE+12
  69  * TXX9_IRQ_BASE+13
  70  * TXX9_IRQ_BASE+14
  71  * TXX9_IRQ_BASE+15
  72  * TXX9_IRQ_BASE+16 TX4927 PCI PCI-C
  73  * TXX9_IRQ_BASE+17
  74  * TXX9_IRQ_BASE+18
  75  * TXX9_IRQ_BASE+19
  76  * TXX9_IRQ_BASE+20
  77  * TXX9_IRQ_BASE+21
  78  * TXX9_IRQ_BASE+22 TX4927 PCI PCI-ERR
  79  * TXX9_IRQ_BASE+23 TX4927 PCI PCI-PMA (not used)
  80  * TXX9_IRQ_BASE+24
  81  * TXX9_IRQ_BASE+25
  82  * TXX9_IRQ_BASE+26
  83  * TXX9_IRQ_BASE+27
  84  * TXX9_IRQ_BASE+28
  85  * TXX9_IRQ_BASE+29
  86  * TXX9_IRQ_BASE+30
  87  * TXX9_IRQ_BASE+31
  88  *
  89  * RBTX4927_IRQ_IOC+00 FPCIB0 PCI-D (SouthBridge)
  90  * RBTX4927_IRQ_IOC+01 FPCIB0 PCI-C (SouthBridge)
  91  * RBTX4927_IRQ_IOC+02 FPCIB0 PCI-B (SouthBridge/IDE/pin=1,INTR)
  92  * RBTX4927_IRQ_IOC+03 FPCIB0 PCI-A (SouthBridge/USB/pin=4)
  93  * RBTX4927_IRQ_IOC+04
  94  * RBTX4927_IRQ_IOC+05
  95  * RBTX4927_IRQ_IOC+06
  96  * RBTX4927_IRQ_IOC+07
  97  *
  98  * NOTES:
  99  * SouthBridge/INTR is mapped to SouthBridge/A=PCI-B/#58
 100  * SouthBridge/ISA/pin=0 no pci irq used by this device
 101  * SouthBridge/IDE/pin=1 no pci irq used by this device, using INTR
 102  * via ISA IRQ14
 103  * SouthBridge/USB/pin=4 using pci irq SouthBridge/D=PCI-A=#59
 104  * SouthBridge/PMC/pin=0 no pci irq used by this device
 105  * SuperIO/PS2/Keyboard, using INTR via ISA IRQ1
 106  * SuperIO/PS2/Mouse, using INTR via ISA IRQ12 (mouse not currently supported)
 107  * JP7 is not bus master -- do NOT use -- only 4 pci bus master's
 108  * allowed -- SouthBridge, JP4, JP5, JP6
 109  */
 110
 111 #include <linux/init.h>
 112 #include <linux/types.h>
 113 #include <linux/interrupt.h>
 114 #include <asm/io.h>
 115 #include <asm/mipsregs.h>
 116 #include <asm/txx9/generic.h>
 117 #include <asm/txx9/rbtx4927.h>
 118
 119 static void toshiba_rbtx4927_irq_ioc_enable(unsigned int irq);
 120 static void toshiba_rbtx4927_irq_ioc_disable(unsigned int irq);
 121
 122 #define TOSHIBA_RBTX4927_IOC_NAME "RBTX4927-IOC"
 123 static struct irq_chip toshiba_rbtx4927_irq_ioc_type = {
 124         .name = TOSHIBA_RBTX4927_IOC_NAME,
 125         .ack = toshiba_rbtx4927_irq_ioc_disable,
 126         .mask = toshiba_rbtx4927_irq_ioc_disable,
 127         .mask_ack = toshiba_rbtx4927_irq_ioc_disable,
 128         .unmask = toshiba_rbtx4927_irq_ioc_enable,
 129 };
 130
 131 static int toshiba_rbtx4927_irq_nested(int sw_irq)
 132 {
 133         u8 level3;
 134
 135         level3 = readb(rbtx4927_imstat_addr) & 0x1f;
 136         if (unlikely(!level3))
 137                 return -1;
 138         return RBTX4927_IRQ_IOC + __fls8(level3);
 139 }
 140
 141 static void __init toshiba_rbtx4927_irq_ioc_init(void)
 142 {
 143         int i;
 144
 145         /* mask all IOC interrupts */
 146         writeb(0, rbtx4927_imask_addr);
 147         /* clear SoftInt interrupts */
 148         writeb(0, rbtx4927_softint_addr);
 149
 150         for (i = RBTX4927_IRQ_IOC;
 151              i < RBTX4927_IRQ_IOC + RBTX4927_NR_IRQ_IOC; i++)
 152                 set_irq_chip_and_handler(i, &toshiba_rbtx4927_irq_ioc_type,
 153                                          handle_level_irq);
 154         set_irq_chained_handler(RBTX4927_IRQ_IOCINT, handle_simple_irq);
 155 }
 156
 157 static void toshiba_rbtx4927_irq_ioc_enable(unsigned int irq)
 158 {
 159         unsigned char v;
 160
 161         v = readb(rbtx4927_imask_addr);
 162         v |= (1 << (irq - RBTX4927_IRQ_IOC));
 163         writeb(v, rbtx4927_imask_addr);
 164 }
 165
 166 static void toshiba_rbtx4927_irq_ioc_disable(unsigned int irq)
 167 {
 168         unsigned char v;
 169
 170         v = readb(rbtx4927_imask_addr);
 171         v &= ~(1 << (irq - RBTX4927_IRQ_IOC));
 172         writeb(v, rbtx4927_imask_addr);
 173         mmiowb();
 174 }
 175
 176
 177 static int rbtx4927_irq_dispatch(int pending)
 178 {
 179         int irq;
 180
 181         if (pending & STATUSF_IP7)                      /* cpu timer */
 182                 irq = MIPS_CPU_IRQ_BASE + 7;
 183         else if (pending & STATUSF_IP2) {               /* tx4927 pic */
 184                 irq = txx9_irq();
 185                 if (irq == RBTX4927_IRQ_IOCINT)
 186                         irq = toshiba_rbtx4927_irq_nested(irq);
 187         } else if (pending & STATUSF_IP0)               /* user line 0 */
 188                 irq = MIPS_CPU_IRQ_BASE + 0;
 189         else if (pending & STATUSF_IP1)                 /* user line 1 */
 190                 irq = MIPS_CPU_IRQ_BASE + 1;
 191         else
 192                 irq = -1;
 193         return irq;
 194 }
 195
 196 void __init rbtx4927_irq_setup(void)
 197 {
 198         txx9_irq_dispatch = rbtx4927_irq_dispatch;
 199         tx4927_irq_init();
 200         toshiba_rbtx4927_irq_ioc_init();
 201         /* Onboard 10M Ether: High Active */
 202         set_irq_type(RBTX4927_RTL_8019_IRQ, IRQF_TRIGGER_HIGH);
 203 }