irq.c (6070B)
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 <linux/irq.h> 115#include <asm/io.h> 116#include <asm/mipsregs.h> 117#include <asm/txx9/generic.h> 118#include <asm/txx9/rbtx4927.h> 119 120static int toshiba_rbtx4927_irq_nested(int sw_irq) 121{ 122 u8 level3; 123 124 level3 = readb(rbtx4927_imstat_addr) & 0x1f; 125 if (unlikely(!level3)) 126 return -1; 127 return RBTX4927_IRQ_IOC + __fls8(level3); 128} 129 130static void toshiba_rbtx4927_irq_ioc_enable(struct irq_data *d) 131{ 132 unsigned char v; 133 134 v = readb(rbtx4927_imask_addr); 135 v |= (1 << (d->irq - RBTX4927_IRQ_IOC)); 136 writeb(v, rbtx4927_imask_addr); 137} 138 139static void toshiba_rbtx4927_irq_ioc_disable(struct irq_data *d) 140{ 141 unsigned char v; 142 143 v = readb(rbtx4927_imask_addr); 144 v &= ~(1 << (d->irq - RBTX4927_IRQ_IOC)); 145 writeb(v, rbtx4927_imask_addr); 146 mmiowb(); 147} 148 149#define TOSHIBA_RBTX4927_IOC_NAME "RBTX4927-IOC" 150static struct irq_chip toshiba_rbtx4927_irq_ioc_type = { 151 .name = TOSHIBA_RBTX4927_IOC_NAME, 152 .irq_mask = toshiba_rbtx4927_irq_ioc_disable, 153 .irq_unmask = toshiba_rbtx4927_irq_ioc_enable, 154}; 155 156static void __init toshiba_rbtx4927_irq_ioc_init(void) 157{ 158 int i; 159 160 /* mask all IOC interrupts */ 161 writeb(0, rbtx4927_imask_addr); 162 /* clear SoftInt interrupts */ 163 writeb(0, rbtx4927_softint_addr); 164 165 for (i = RBTX4927_IRQ_IOC; 166 i < RBTX4927_IRQ_IOC + RBTX4927_NR_IRQ_IOC; i++) 167 irq_set_chip_and_handler(i, &toshiba_rbtx4927_irq_ioc_type, 168 handle_level_irq); 169 irq_set_chained_handler(RBTX4927_IRQ_IOCINT, handle_simple_irq); 170} 171 172static int rbtx4927_irq_dispatch(int pending) 173{ 174 int irq; 175 176 if (pending & STATUSF_IP7) /* cpu timer */ 177 irq = MIPS_CPU_IRQ_BASE + 7; 178 else if (pending & STATUSF_IP2) { /* tx4927 pic */ 179 irq = txx9_irq(); 180 if (irq == RBTX4927_IRQ_IOCINT) 181 irq = toshiba_rbtx4927_irq_nested(irq); 182 } else if (pending & STATUSF_IP0) /* user line 0 */ 183 irq = MIPS_CPU_IRQ_BASE + 0; 184 else if (pending & STATUSF_IP1) /* user line 1 */ 185 irq = MIPS_CPU_IRQ_BASE + 1; 186 else 187 irq = -1; 188 return irq; 189} 190 191void __init rbtx4927_irq_setup(void) 192{ 193 txx9_irq_dispatch = rbtx4927_irq_dispatch; 194 tx4927_irq_init(); 195 toshiba_rbtx4927_irq_ioc_init(); 196 /* Onboard 10M Ether: High Active */ 197 irq_set_irq_type(RBTX4927_RTL_8019_IRQ, IRQF_TRIGGER_HIGH); 198}