txx9/rbtx4927/irq.c

0001 /*
0002  * Toshiba RBTX4927 specific interrupt handlers
0003  *
0004  * Author: MontaVista Software, Inc.
0005  *     source@mvista.com
0006  *
0007  * Copyright 2001-2002 MontaVista Software Inc.
0008  *
0009  *  This program is free software; you can redistribute it and/or modify it
0010  *  under the terms of the GNU General Public License as published by the
0011  *  Free Software Foundation; either version 2 of the License, or (at your
0012  *  option) any later version.
0013  *
0014  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
0015  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
0016  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
0017  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
0018  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
0019  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
0020  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
0021  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
0022  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
0023  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0024  *
0025  *  You should have received a copy of the GNU General Public License along
0026  *  with this program; if not, write to the Free Software Foundation, Inc.,
0027  *  675 Mass Ave, Cambridge, MA 02139, USA.
0028  */
0029 /*
0030  * I8259A_IRQ_BASE+00
0031  * I8259A_IRQ_BASE+01 PS2/Keyboard
0032  * I8259A_IRQ_BASE+02 Cascade RBTX4927-ISA (irqs 8-15)
0033  * I8259A_IRQ_BASE+03
0034  * I8259A_IRQ_BASE+04
0035  * I8259A_IRQ_BASE+05
0036  * I8259A_IRQ_BASE+06
0037  * I8259A_IRQ_BASE+07
0038  * I8259A_IRQ_BASE+08
0039  * I8259A_IRQ_BASE+09
0040  * I8259A_IRQ_BASE+10
0041  * I8259A_IRQ_BASE+11
0042  * I8259A_IRQ_BASE+12 PS2/Mouse (not supported at this time)
0043  * I8259A_IRQ_BASE+13
0044  * I8259A_IRQ_BASE+14 IDE
0045  * I8259A_IRQ_BASE+15
0046  *
0047  * MIPS_CPU_IRQ_BASE+00 Software 0
0048  * MIPS_CPU_IRQ_BASE+01 Software 1
0049  * MIPS_CPU_IRQ_BASE+02 Cascade TX4927-CP0
0050  * MIPS_CPU_IRQ_BASE+03 Multiplexed -- do not use
0051  * MIPS_CPU_IRQ_BASE+04 Multiplexed -- do not use
0052  * MIPS_CPU_IRQ_BASE+05 Multiplexed -- do not use
0053  * MIPS_CPU_IRQ_BASE+06 Multiplexed -- do not use
0054  * MIPS_CPU_IRQ_BASE+07 CPU TIMER
0055  *
0056  * TXX9_IRQ_BASE+00
0057  * TXX9_IRQ_BASE+01
0058  * TXX9_IRQ_BASE+02
0059  * TXX9_IRQ_BASE+03 Cascade RBTX4927-IOC
0060  * TXX9_IRQ_BASE+04
0061  * TXX9_IRQ_BASE+05 RBTX4927 RTL-8019AS ethernet
0062  * TXX9_IRQ_BASE+06
0063  * TXX9_IRQ_BASE+07
0064  * TXX9_IRQ_BASE+08 TX4927 SerialIO Channel 0
0065  * TXX9_IRQ_BASE+09 TX4927 SerialIO Channel 1
0066  * TXX9_IRQ_BASE+10
0067  * TXX9_IRQ_BASE+11
0068  * TXX9_IRQ_BASE+12
0069  * TXX9_IRQ_BASE+13
0070  * TXX9_IRQ_BASE+14
0071  * TXX9_IRQ_BASE+15
0072  * TXX9_IRQ_BASE+16 TX4927 PCI PCI-C
0073  * TXX9_IRQ_BASE+17
0074  * TXX9_IRQ_BASE+18
0075  * TXX9_IRQ_BASE+19
0076  * TXX9_IRQ_BASE+20
0077  * TXX9_IRQ_BASE+21
0078  * TXX9_IRQ_BASE+22 TX4927 PCI PCI-ERR
0079  * TXX9_IRQ_BASE+23 TX4927 PCI PCI-PMA (not used)
0080  * TXX9_IRQ_BASE+24
0081  * TXX9_IRQ_BASE+25
0082  * TXX9_IRQ_BASE+26
0083  * TXX9_IRQ_BASE+27
0084  * TXX9_IRQ_BASE+28
0085  * TXX9_IRQ_BASE+29
0086  * TXX9_IRQ_BASE+30
0087  * TXX9_IRQ_BASE+31
0088  *
0089  * RBTX4927_IRQ_IOC+00 FPCIB0 PCI-D (SouthBridge)
0090  * RBTX4927_IRQ_IOC+01 FPCIB0 PCI-C (SouthBridge)
0091  * RBTX4927_IRQ_IOC+02 FPCIB0 PCI-B (SouthBridge/IDE/pin=1,INTR)
0092  * RBTX4927_IRQ_IOC+03 FPCIB0 PCI-A (SouthBridge/USB/pin=4)
0093  * RBTX4927_IRQ_IOC+04
0094  * RBTX4927_IRQ_IOC+05
0095  * RBTX4927_IRQ_IOC+06
0096  * RBTX4927_IRQ_IOC+07
0097  *
0098  * NOTES:
0099  * SouthBridge/INTR is mapped to SouthBridge/A=PCI-B/#58
0100  * SouthBridge/ISA/pin=0 no pci irq used by this device
0101  * SouthBridge/IDE/pin=1 no pci irq used by this device, using INTR
0102  * via ISA IRQ14
0103  * SouthBridge/USB/pin=4 using pci irq SouthBridge/D=PCI-A=#59
0104  * SouthBridge/PMC/pin=0 no pci irq used by this device
0105  * SuperIO/PS2/Keyboard, using INTR via ISA IRQ1
0106  * SuperIO/PS2/Mouse, using INTR via ISA IRQ12 (mouse not currently supported)
0107  * JP7 is not bus master -- do NOT use -- only 4 pci bus master's
0108  * allowed -- SouthBridge, JP4, JP5, JP6
0109  */
0110
0111 #include <linux/init.h>
0112 #include <linux/types.h>
0113 #include <linux/interrupt.h>
0114 #include <linux/irq.h>
0115 #include <asm/io.h>
0116 #include <asm/mipsregs.h>
0117 #include <asm/txx9/generic.h>
0118 #include <asm/txx9/rbtx4927.h>
0119
0120 static int toshiba_rbtx4927_irq_nested(int sw_irq)
0121 {
0122     u8 level3;
0123
0124     level3 = readb(rbtx4927_imstat_addr) & 0x1f;
0125     if (unlikely(!level3))
0126         return -1;
0127     return RBTX4927_IRQ_IOC + __fls8(level3);
0128 }
0129
0130 static void toshiba_rbtx4927_irq_ioc_enable(struct irq_data *d)
0131 {
0132     unsigned char v;
0133
0134     v = readb(rbtx4927_imask_addr);
0135     v |= (1 << (d->irq - RBTX4927_IRQ_IOC));
0136     writeb(v, rbtx4927_imask_addr);
0137 }
0138
0139 static void toshiba_rbtx4927_irq_ioc_disable(struct irq_data *d)
0140 {
0141     unsigned char v;
0142
0143     v = readb(rbtx4927_imask_addr);
0144     v &= ~(1 << (d->irq - RBTX4927_IRQ_IOC));
0145     writeb(v, rbtx4927_imask_addr);
0146     mmiowb();
0147 }
0148
0149 #define TOSHIBA_RBTX4927_IOC_NAME "RBTX4927-IOC"
0150 static struct irq_chip toshiba_rbtx4927_irq_ioc_type = {
0151     .name = TOSHIBA_RBTX4927_IOC_NAME,
0152     .irq_mask = toshiba_rbtx4927_irq_ioc_disable,
0153     .irq_unmask = toshiba_rbtx4927_irq_ioc_enable,
0154 };
0155
0156 static void __init toshiba_rbtx4927_irq_ioc_init(void)
0157 {
0158     int i;
0159
0160     /* mask all IOC interrupts */
0161     writeb(0, rbtx4927_imask_addr);
0162     /* clear SoftInt interrupts */
0163     writeb(0, rbtx4927_softint_addr);
0164
0165     for (i = RBTX4927_IRQ_IOC;
0166          i < RBTX4927_IRQ_IOC + RBTX4927_NR_IRQ_IOC; i++)
0167         irq_set_chip_and_handler(i, &toshiba_rbtx4927_irq_ioc_type,
0168                      handle_level_irq);
0169     irq_set_chained_handler(RBTX4927_IRQ_IOCINT, handle_simple_irq);
0170 }
0171
0172 static int rbtx4927_irq_dispatch(int pending)
0173 {
0174     int irq;
0175
0176     if (pending & STATUSF_IP7)          /* cpu timer */
0177         irq = MIPS_CPU_IRQ_BASE + 7;
0178     else if (pending & STATUSF_IP2) {       /* tx4927 pic */
0179         irq = txx9_irq();
0180         if (irq == RBTX4927_IRQ_IOCINT)
0181             irq = toshiba_rbtx4927_irq_nested(irq);
0182     } else if (pending & STATUSF_IP0)       /* user line 0 */
0183         irq = MIPS_CPU_IRQ_BASE + 0;
0184     else if (pending & STATUSF_IP1)         /* user line 1 */
0185         irq = MIPS_CPU_IRQ_BASE + 1;
0186     else
0187         irq = -1;
0188     return irq;
0189 }
0190
0191 void __init rbtx4927_irq_setup(void)
0192 {
0193     txx9_irq_dispatch = rbtx4927_irq_dispatch;
0194     tx4927_irq_init();
0195     toshiba_rbtx4927_irq_ioc_init();
0196     /* Onboard 10M Ether: High Active */
0197     irq_set_irq_type(RBTX4927_RTL_8019_IRQ, IRQF_TRIGGER_HIGH);
0198 }